NEWS

   1 GNU C Library NEWS -- history of user-visible changes.
   2 Copyright (C) 1992-2019 Free Software Foundation, Inc.
   3 See the end for copying conditions.
   4
   5 Please send GNU C library bug reports via <https://sourceware.org/bugzilla/>
   6 using `glibc' in the "product" field.
   7 \f
   8 Version 2.30
   9
  10 Major new features:
  11
  12 * Unicode 12.0.0 Support: Character encoding, character type info, and
  13   transliteration tables are all updated to Unicode 12.0.0, using
  14   generator scripts contributed by Mike FABIAN (Red Hat).
  15
  16 * The dynamic linker accepts the --preload argument to preload shared
  17   objects, in addition to the LD_PRELOAD environment variable.
  18
  19 * On Linux, the gettid function has been added.
  20
  21 * Minguo (Republic of China) calendar support has been added as an
  22   alternative calendar for the following locales: zh_TW, cmn_TW, hak_TW,
  23   nan_TW, lzh_TW.
  24
  25 * The entry for the new Japanese era has been added for ja_JP locale.
  26
  27 * Memory allocation functions malloc, calloc, realloc, reallocarray, valloc,
  28   pvalloc, memalign, and posix_memalign fail now with total object size
  29   larger than PTRDIFF_MAX.  This is to avoid potential undefined behavior with
  30   pointer subtraction within the allocated object, where results might
  31   overflow the ptrdiff_t type.
  32
  33 Deprecated and removed features, and other changes affecting compatibility:
  34
  35 * The functions clock_gettime, clock_getres, clock_settime,
  36   clock_getcpuclockid, clock_nanosleep were removed from the librt library
  37   for new applications (on architectures which had them).  Instead, the
  38   definitions in libc will be used automatically, which have been available
  39   since glibc 2.17.
  40
  41 * The obsolete and never-implemented XSI STREAMS header files <stropts.h>
  42   and <sys/stropts.h> have been removed.
  43
  44 * Support for the "inet6" option in /etc/resolv.conf and the RES_USE_INET6
  45   resolver flag (deprecated in glibc 2.25) have been removed.
  46
  47 * The obsolete RES_INSECURE1 and RES_INSECURE2 option flags for the DNS stub
  48   resolver have been removed from <resolv.h>.
  49
  50 Changes to build and runtime requirements:
  51
  52 * GCC 6.2 or later is required to build the GNU C Library.
  53
  54   Older GCC versions and non-GNU compilers are still supported when
  55   compiling programs that use the GNU C Library.
  56
  57 Security related changes:
  58
  59   CVE-2019-7309: x86-64 memcmp used signed Jcc instructions to check
  60   size.  For x86-64, memcmp on an object size larger than SSIZE_MAX
  61   has undefined behavior.  On x32, the size_t argument may be passed
  62   in the lower 32 bits of the 64-bit RDX register with non-zero upper
  63   32 bits.  When it happened with the sign bit of RDX register set,
  64   memcmp gave the wrong result since it treated the size argument as
  65   zero.  Reported by H.J. Lu.
  66
  67   CVE-2019-9169: Attempted case-insensitive regular-expression match
  68   via proceed_next_node in posix/regexec.c leads to heap-based buffer
  69   over-read.  Reported by Hongxu Chen.
  70
  71 The following bugs are resolved with this release:
  72
  73   [The release manager will add the list generated by
  74   scripts/list-fixed-bugs.py just before the release.]
  75
  76 \f
  77 Version 2.29
  78
  79 Major new features:
  80
  81 * The getcpu wrapper function has been added, which returns the currently
  82   used CPU and NUMA node.  This function is Linux-specific.
  83
  84 * A new convenience target has been added for distribution maintainers
  85   to build and install all locales as directories with files.  The new
  86   target is run by issuing the following command in your build tree:
  87   'make localedata/install-locale-files', with an optional DESTDIR
  88   to set the install root if you wish to install into a non-default
  89   configured location.
  90
  91 * Optimized generic exp, exp2, log, log2, pow, sinf, cosf, sincosf and tanf.
  92
  93 * The reallocarray function is now declared under _DEFAULT_SOURCE, not just
  94   for _GNU_SOURCE, to match BSD environments.
  95
  96 * For powercp64le ABI, Transactional Lock Elision is now enabled iff kernel
  97   indicates that it will abort the transaction prior to entering the kernel
  98   (PPC_FEATURE2_HTM_NOSC on hwcap2).  On older kernels the transaction is
  99   suspended, and this caused some undefined side-effects issues by aborting
 100   transactions manually.  Glibc avoided it by abort transactions manually on
 101   each syscall, but it lead to performance issues on newer kernels where the
 102   HTM state is saved and restore lazily (the state being saved even when the
 103   process actually does not use HTM).
 104
 105 * The functions posix_spawn_file_actions_addchdir_np and
 106   posix_spawn_file_actions_addfchdir_np have been added, enabling
 107   posix_spawn and posix_spawnp to run the new process in a different
 108   directory.  These functions are GNU extensions.  The function
 109   posix_spawn_file_actions_addchdir_np is similar to the Solaris function
 110   of the same name.
 111
 112 * The popen and system do not run atfork handlers anymore (BZ#17490).
 113   Although it is a possible POSIX violation, the POSIX rationale in
 114   pthread_atfork documentation regarding atfork handlers is to handle
 115   inconsistent mutex state after a fork call in a multi-threaded process.
 116   In both popen and system there is no direct access to user-defined mutexes.
 117
 118 * Support for the C-SKY ABIV2 running on Linux has been added.  This port
 119   requires at least binutils-2.32, gcc-9.0, and linux-4.20.  Two ABIs are
 120   supported:
 121     - C-SKY ABIV2 soft-float little-endian
 122     - C-SKY ABIV2 hard-float little-endian
 123
 124 * strftime's default formatting of a locale's alternative year (%Ey)
 125   has been changed to zero-pad the year to a minimum of two digits,
 126   like "%y".  This improves the display of Japanese era years during
 127   the first nine years of a new era, and is expected to be harmless
 128   for all other locales (only Japanese locales regularly have
 129   alternative year numbers less than 10).  Zero-padding can be
 130   overridden with the '_' or '-' flags (which are GNU extensions).
 131
 132 * As a GNU extension, the '_' and '-' flags can now be applied to
 133   "%EY" to control how the year number is formatted; they have the
 134   same effect that they would on "%Ey".
 135
 136 Deprecated and removed features, and other changes affecting compatibility:
 137
 138 * The glibc.tune tunable namespace has been renamed to glibc.cpu and the
 139   tunable glibc.tune.cpu has been renamed to glibc.cpu.name.
 140
 141 * The type of the pr_uid and pr_gid members of struct elf_prpsinfo, defined
 142   in <sys/procfs.h>, has been corrected to match the type actually used by
 143   the Linux kernel.  This affects the size and layout of that structure on
 144   MicroBlaze, MIPS (n64 ABI only), Nios II and RISC-V.
 145
 146 * For the MIPS n32 ABI, the type of the pr_sigpend and pr_sighold members of
 147   struct elf_prstatus, and the pr_flag member of struct elf_prpsinfo,
 148   defined in <sys/procfs.h>, has been corrected to match the type actually
 149   used by the Linux kernel.  This affects the size and layout of those
 150   structures.
 151
 152 * An archaic GNU extension to scanf, under which '%as', '%aS', and '%a[...]'
 153   meant to scan a string and allocate space for it with malloc, is now
 154   restricted to programs compiled in C89 or C++98 mode with _GNU_SOURCE
 155   defined.  This extension conflicts with C99's use of '%a' to scan a
 156   hexadecimal floating-point number, which is now available to programs
 157   compiled as C99 or C++11 or higher, regardless of _GNU_SOURCE.
 158
 159   POSIX.1-2008 includes the feature of allocating a buffer for string input
 160   with malloc, using the modifier letter 'm' instead.  Programs using
 161   '%as', '%aS', or '%a[...]' with the old GNU meaning should change to
 162   '%ms', '%mS', or '%m[...]' respectively.  Programs that wish to use the
 163   C99 '%a' no longer need to avoid _GNU_SOURCE.
 164
 165   GCC's -Wformat warnings can detect most uses of this extension, as long
 166   as all functions that call vscanf, vfscanf, or vsscanf are annotated with
 167   __attribute__ ((format (scanf, ...))).
 168
 169 Changes to build and runtime requirements:
 170
 171 * Python 3.4 or later is required to build the GNU C Library.
 172
 173 * On most architectures, GCC 5 or later is required to build the GNU C
 174   Library.  (On powerpc64le, GCC 6.2 or later is still required, as before.)
 175
 176   Older GCC versions and non-GNU compilers are still supported when
 177   compiling programs that use the GNU C Library.
 178
 179 Security related changes:
 180
 181   CVE-2018-19591: A file descriptor leak in if_nametoindex can lead to a
 182   denial of service due to resource exhaustion when processing getaddrinfo
 183   calls with crafted host names.  Reported by Guido Vranken.
 184
 185   CVE-2019-6488: On x32, the size_t parameter may be passed in the lower
 186   32 bits of a 64-bit register with with non-zero upper 32 bit.  When it
 187   happened, accessing the 32-bit size_t value as the full 64-bit register
 188   in the assembly string/memory functions would cause a buffer overflow.
 189   Reported by H.J. Lu.
 190
 191   CVE-2016-10739: The getaddrinfo function could successfully parse IPv4
 192   addresses with arbitrary trailing characters, potentially leading to data
 193   or command injection issues in applications.
 194
 195 The following bugs are resolved with this release:
 196
 197   [10425] localedata: it_IT/it_CH: LC_TIME format is wrong
 198   [10496] localedata: 12h time representation in multiple locales faulty
 199   [10797] localedata: it_IT locale numeric does not have a separator for
 200     thousands
 201   [11319] libc: dprintf doesn't handle errors properly
 202   [16346] time: mktime: potentially unsafe use of localtime_offset
 203   [17248] build: glibc should not sort CFLAGS (support gcc plugins and
 204     --param options)
 205   [17405] libc: Implement posix_spawn_file_actions_addchdir_np,
 206     posix_spawn_file_actions_addfchdir_np
 207   [17426] localedata: Indian locales: set the correct date format
 208   [17490] stdio: popen should not invoke atfork handlers
 209   [17783] libc: TIOCSER_TEMT conditions inconsistent
 210   [18040] regex: use-after-free in regexec/get_subexp
 211   [18093] libc: Corrupted aux-cache causes ldconfig to segfault
 212   [20018] network: getaddrinfo should reject IP addresses with trailing
 213     characters (CVE-2016-10739)
 214   [20209] localedata: Spelling mistake for Sunday in Greenlandic kl_GL
 215   [20271] libc: Missing "\n" in __libc_fatal calls
 216   [20480] dynamic-link: Patch: ifunc not executable, crashes sudo qemu
 217   [20544] libc: RFE: atexit, __cxa_atexit, on_exit should assert function
 218     pointer argument is non-NULL
 219   [21037] stdio: open_memstream and freopen
 220   [21286] libc: bits/siginfo.h  is missing enum definition for TRAP_HWBKPT
 221   [21716] time: Crash in glibc's mktime in low-memory situations
 222   [22834] stdio: Subprocess forked by popen may crash in Linux when
 223     multithreads call popen
 224   [22927] network: crash in vn_gai_enqueue_request if requests_tail was NULL
 225     and pthread_create fails.
 226   [23032] hurd: sysdeps/htl/pt-barrier-init.c:39: bad call to memcmp ?
 227   [23125] libc: riscv64: endless loop when throwing an exception from a
 228     constructor
 229   [23275] nptl: Race in pthread_mutex_lock while promoting to
 230     PTHREAD_MUTEX_ELISION_NP.
 231   [23400] libc: stdlib/test-bz22786.c creates temporary files in glibc
 232     source tree
 233   [23479] math: [mips] bits/fenv.h should not define some macros for soft-
 234     float
 235   [23490] libc: sysdeps/unix/sysv/linux/x86/tst-cet-property-2.c:49: off by
 236     one error
 237   [23497] libc: readdir64@GLIBC_2.1 cannot parse the kernel directory stream
 238   [23509] dynamic-link: CET enabled glibc is incompatible with the older
 239     linker
 240   [23520] nscd: nscd: Use-after-free in addgetnetgrentX and its callers
 241   [23521] nss: get_next_alias nss_files file stream leak
 242   [23538] nptl: Hang in pthread_cond_broadcast
 243   [23562] libc: Wrong type for si_band in Linux-specific siginfo_t
 244   [23578] regex: Invalid memory access if regex pattern contains NUL byte
 245   [23579] libc: Errors misreported in preadv2
 246   [23597] build: support/test-container.c doesn't work with different
 247     filesystems
 248   [23603] time: mktime signed integer overflow on large timestamps
 249   [23606] libc: Missing ENDBR32 in sysdeps/i386/start.S
 250   [23614] libc: powerpc: missing CFI register information in __mpn_*
 251     functions
 252   [23637] string: Generic strstr/strcasestr fails with huge needles
 253   [23640] libc: no way to easily clear FD_CLOEXEC in
 254     posix_spawn_file_actions_adddup2()
 255   [23649] libc: [microblaze/mips/nios2/riscv] sys/procfs.h pr_uid, pr_gid
 256     have wrong type
 257   [23656] libc: [mips n32] sys/procfs.h pr_sigpend, pr_sighold, pr_flag have
 258     wrong type
 259   [23679] libc: gethostid: Missing NULL check for gethostbyname_r result
 260   [23689] libc: Bug in documentation for rusage.ru_ixrss in
 261     bits/types/struct_rusage.h
 262   [23690] dynamic-link: Segfault in _dl_profile_fixup with a high number of
 263     threads
 264   [23707] dynamic-link: Missing unwind info in sysdeps/powerpc/powerpc32/dl-
 265     start.S
 266   [23709] string: glibc 2.25 lacks sse2 optimized strstr()
 267   [23716] dynamic-link: _dl_runtime_resolve_shstk isn't selected properly
 268   [23717] libc: glibc: stdlib/tst-setcontext9 test suite failure on
 269     powerpc64le
 270   [23724] localedata: Albanian date formats are incorrect
 271   [23735] math: libnldbl_nonshared.a references internal libm symbols
 272   [23740] localedata: kl_GL: Month names and date formats need update
 273   [23744] regex: regex refactorings to remove BE, avoid duplication
 274   [23745] time: mktime fix for Gnulib + coreutils
 275   [23758] time: Improve the width of alternate representation for year in
 276     strftime
 277   [23783] libc: [mips] Missing CMSPAR bits/termios.h
 278   [23789] time: mktime does not set errno on failure
 279   [23791] localedata: Wrong monetary format for ca_ES locale
 280   [23793] locale: c32rtomb and mbrtoc32 should not alias wcrtomb and mbrtowc
 281   [23794] locale: c16rtomb does not handle surrogate pairs
 282   [23821] libc: si_band in siginfo_t has wrong type long int on sparc64
 283   [23822] math: ia64 static libm.a is missing exp2f, log2f and powf symbols
 284   [23836] time: time/tst-mktime2 test failure on Arm (32-bit)
 285   [23848] libc: [sparc] Some socket syscalls wrongly assumed to be present
 286   [23861] nptl: rdlock stalls indefinitely on an unlocked pthread rwlock
 287   [23862] libc: [sh] missing kernel-features.h undefines
 288   [23864] libc: [riscv] missing kernel-features.h undefines
 289   [23867] libc: [arm/microblaze] __ASSUME_MLOCK2 incorrect
 290   [23907] malloc: Incorrect double-free malloc tcache check disregards
 291     tcache size
 292   [23913] libc: off-by-one in function maybe_script_execute in
 293     sysdeps/posix/spawni.c
 294   [23915] libc: [arm] __ASSUME_COPY_FILE_RANGE incorrect
 295   [23923] locale: Add --no-hard-links option to localedef
 296   [23927] network: Linux if_nametoindex() does not close descriptor
 297     (CVE-2018-19591)
 298   [23961] math: powf can overflow to inf without setting errno in non-
 299     nearest rounding mode
 300   [23967] libc: [2.28 Regression]: New sigaction implementation breaks m68k
 301   [23972] libc: __old_getdents64 uses wrong d_off value on overflow
 302   [23993] libc: glibc 2.29 doesn't build with gcc 4.9
 303   [23995] localedata: Remove execution flags from localedata/locales/bi_VU
 304   [24011] localedata: Fixed small type in comment for locale bs_BA
 305   [24018] libc: gettext() may return NULL
 306   [24022] build: riscv build failure with Linux kernel 4.20-rc7
 307   [24023] build: [2.29 Regression] FAIL: elf/check-localplt
 308   [24024] string: strerror() might set errno to ENOMEM due to -fno-math-
 309     error
 310   [24027] malloc: glibc: realloc() ncopies 32-bit integer overflow
 311   [24034] libc: tst-cancel21-static fails with SIGBUS on pre-ARMv7 when
 312     using GCC 8
 313   [24046] localedata: en_US locale doesn't define date_fmt
 314   [24063] manual: @var{errno} should be @code{errno}
 315   [24066] soft-fp: Inconsistent _FP_W_TYPE_SIZE check
 316   [24088] libc: VSCR field is not being correctly read in ucontext_t on
 317     ppc64le
 318   [24096] time: Specifying '_' or '-' flag for "%EY" does not produce the
 319     expected result
 320   [24097] string: Can't use 64-bit register for size_t in assembly codes for
 321     x32 (CVE-2019-6488)
 322   [24110] hurd: SS_DISABLE never set in stack_t value returned by
 323     sigaltstack
 324   [24112] network: Do not send DNS queries for non-host names (where all
 325     answers will be rejected)
 326   [24130] libc: alpha __remqu corrupts $f3 register
 327
 328 \f
 329 Version 2.28
 330
 331 Major new features:
 332
 333 * The localization data for ISO 14651 is updated to match the 2016
 334   Edition 4 release of the standard, this matches data provided by
 335   Unicode 9.0.0.  This update introduces significant improvements to the
 336   collation of Unicode characters.  This release deviates slightly from
 337   the standard in that the collation element ordering for lowercase and
 338   uppercase LATIN script characters is adjusted to ensure that regular
 339   expressions with ranges like [a-z] and [A-Z] don't interleave e.g. A
 340   is not matched by [a-z].  With the update many locales have been
 341   updated to take advantage of the new collation information.  The new
 342   collation information has increased the size of the compiled locale
 343   archive or binary locales.
 344
 345 * The GNU C Library can now be compiled with support for Intel CET, AKA
 346   Intel Control-flow Enforcement Technology.  When the library is built
 347   with --enable-cet, the resulting glibc is protected with indirect
 348   branch tracking (IBT) and shadow stack (SHSTK).  CET-enabled glibc is
 349   compatible with all existing executables and shared libraries.  This
 350   feature is currently supported on i386, x86_64 and x32 with GCC 8 and
 351   binutils 2.29 or later.  Note that CET-enabled glibc requires CPUs
 352   capable of multi-byte NOPs, like x86-64 processors as well as Intel
 353   Pentium Pro or newer.  NOTE: --enable-cet has been tested for i686,
 354   x86_64 and x32 on non-CET processors.  --enable-cet has been tested
 355   for x86_64 and x32 on CET SDVs, but Intel CET support hasn't been
 356   validated for i686.
 357
 358 * The GNU C Library now has correct support for ABSOLUTE symbols
 359   (SHN_ABS-relative symbols).  Previously such ABSOLUTE symbols were
 360   relocated incorrectly or in some cases discarded.  The GNU linker can
 361   make use of the newer semantics, but it must communicate it to the
 362   dynamic loader by setting the ELF file's identification (EI_ABIVERSION
 363   field) to indicate such support is required.
 364
 365 * Unicode 11.0.0 Support: Character encoding, character type info, and
 366   transliteration tables are all updated to Unicode 11.0.0, using
 367   generator scripts contributed by Mike FABIAN (Red Hat).
 368
 369 * <math.h> functions that round their results to a narrower type are added
 370   from TS 18661-1:2014 and TS 18661-3:2015:
 371
 372   - fadd, faddl, daddl and corresponding fMaddfN, fMaddfNx, fMxaddfN and
 373     fMxaddfNx functions.
 374
 375   - fsub, fsubl, dsubl and corresponding fMsubfN, fMsubfNx, fMxsubfN and
 376     fMxsubfNx functions.
 377
 378   - fmul, fmull, dmull and corresponding fMmulfN, fMmulfNx, fMxmulfN and
 379     fMxmulfNx functions.
 380
 381   - fdiv, fdivl, ddivl and corresponding fMdivfN, fMdivfNx, fMxdivfN and
 382     fMxdivfNx functions.
 383
 384 * Two grammatical forms of month names are now supported for the following
 385   languages: Armenian, Asturian, Catalan, Czech, Kashubian, Occitan, Ossetian,
 386   Scottish Gaelic, Upper Sorbian, and Walloon.  The following languages now
 387   support two grammatical forms in abbreviated month names: Catalan, Greek,
 388   and Kashubian.
 389
 390 * Newly added locales: Lower Sorbian (dsb_DE) and Yakut (sah_RU) also
 391   include the support for two grammatical forms of month names.
 392
 393 * Building and running on GNU/Hurd systems now works without out-of-tree
 394   patches.
 395
 396 * The renameat2 function has been added, a variant of the renameat function
 397   which has a flags argument.  If the flags are zero, the renameat2 function
 398   acts like renameat.  If the flag is not zero and there is no kernel
 399   support for renameat2, the function will fail with an errno value of
 400   EINVAL.  This is different from the existing gnulib function renameatu,
 401   which performs a plain rename operation in case of a RENAME_NOREPLACE
 402   flags and a non-existing destination (and therefore has a race condition
 403   that can clobber the destination inadvertently).
 404
 405 * The statx function has been added, a variant of the fstatat64
 406   function with an additional flags argument.  If there is no direct
 407   kernel support for statx, glibc provides basic stat support based on
 408   the fstatat64 function.
 409
 410 * IDN domain names in getaddrinfo and getnameinfo now use the system libidn2
 411   library if installed.  libidn2 version 2.0.5 or later is recommended.  If
 412   libidn2 is not available, internationalized domain names are not encoded
 413   or decoded even if the AI_IDN or NI_IDN flags are passed to getaddrinfo or
 414   getnameinfo.  (getaddrinfo calls with non-ASCII names and AI_IDN will fail
 415   with an encoding error.)  Flags which used to change the IDN encoding and
 416   decoding behavior (AI_IDN_ALLOW_UNASSIGNED, AI_IDN_USE_STD3_ASCII_RULES,
 417   NI_IDN_ALLOW_UNASSIGNED, NI_IDN_USE_STD3_ASCII_RULES) have been
 418   deprecated.  They no longer have any effect.
 419
 420 * Parsing of dynamic string tokens in DT_RPATH, DT_RUNPATH, DT_NEEDED,
 421   DT_AUXILIARY, and DT_FILTER has been expanded to support the full
 422   range of ELF gABI expressions including such constructs as
 423   '$ORIGIN$ORIGIN' (if valid).  For SUID/GUID applications the rules
 424   have been further restricted, and where in the past a dynamic string
 425   token sequence may have been interpreted as a literal string it will
 426   now cause a load failure.  These load failures were always considered
 427   unspecified behaviour from the perspective of the dynamic loader, and
 428   for safety are now load errors e.g. /foo/${ORIGIN}.so in DT_NEEDED
 429   results in a load failure now.
 430
 431 * Support for ISO C threads (ISO/IEC 9899:2011) has been added.  The
 432   implementation includes all the standard functions provided by
 433   <threads.h>:
 434
 435   - thrd_current, thrd_equal, thrd_sleep, thrd_yield, thrd_create,
 436     thrd_detach, thrd_exit, and thrd_join for thread management.
 437
 438   - mtx_init, mtx_lock, mtx_timedlock, mtx_trylock, mtx_unlock, and
 439     mtx_destroy for mutual exclusion.
 440
 441   - call_once for function call synchronization.
 442
 443   - cnd_broadcast, cnd_destroy, cnd_init, cnd_signal, cnd_timedwait, and
 444     cnd_wait for conditional variables.
 445
 446   - tss_create, tss_delete, tss_get, and tss_set for thread-local storage.
 447
 448   Application developers must link against libpthread to use ISO C threads.
 449
 450 Deprecated and removed features, and other changes affecting compatibility:
 451
 452 * The nonstandard header files <libio.h> and <_G_config.h> are no longer
 453   installed.  Software that was using either header should be updated to
 454   use standard <stdio.h> interfaces instead.
 455
 456 * The stdio functions 'getc' and 'putc' are no longer defined as macros.
 457   This was never required by the C standard, and the macros just expanded
 458   to call alternative names for the same functions.  If you hoped getc and
 459   putc would provide performance improvements over fgetc and fputc, instead
 460   investigate using (f)getc_unlocked and (f)putc_unlocked, and, if
 461   necessary, flockfile and funlockfile.
 462
 463 * All stdio functions now treat end-of-file as a sticky condition.  If you
 464   read from a file until EOF, and then the file is enlarged by another
 465   process, you must call clearerr or another function with the same effect
 466   (e.g. fseek, rewind) before you can read the additional data.  This
 467   corrects a longstanding C99 conformance bug.  It is most likely to affect
 468   programs that use stdio to read interactive input from a terminal.
 469   (Bug #1190.)
 470
 471 * The macros 'major', 'minor', and 'makedev' are now only available from
 472   the header <sys/sysmacros.h>; not from <sys/types.h> or various other
 473   headers that happen to include <sys/types.h>.  These macros are rarely
 474   used, not part of POSIX nor XSI, and their names frequently collide with
 475   user code; see https://sourceware.org/bugzilla/show_bug.cgi?id=19239 for
 476   further explanation.
 477
 478   <sys/sysmacros.h> is a GNU extension.  Portable programs that require
 479   these macros should first include <sys/types.h>, and then include
 480   <sys/sysmacros.h> if __GNU_LIBRARY__ is defined.
 481
 482 * The tilegx*-*-linux-gnu configurations are no longer supported.
 483
 484 * The obsolete function ustat is no longer available to newly linked
 485   binaries; the headers <ustat.h> and <sys/ustat.h> have been removed.  This
 486   function has been deprecated in favor of fstatfs and statfs.
 487
 488 * The obsolete function nfsservctl is no longer available to newly linked
 489   binaries.  This function was specific to systems using the Linux kernel
 490   and could not usefully be used with the GNU C Library on systems with
 491   version 3.1 or later of the Linux kernel.
 492
 493 * The obsolete function name llseek is no longer available to newly linked
 494   binaries.  This function was specific to systems using the Linux kernel
 495   and was not declared in a header.  Programs should use the lseek64 name
 496   for this function instead.
 497
 498 * The AI_IDN_ALLOW_UNASSIGNED and NI_IDN_ALLOW_UNASSIGNED flags for the
 499   getaddrinfo and getnameinfo functions have been deprecated.  The behavior
 500   previously selected by them is now always enabled.
 501
 502 * The AI_IDN_USE_STD3_ASCII_RULES and NI_IDN_USE_STD3_ASCII_RULES flags for
 503   the getaddrinfo and getnameinfo functions have been deprecated.  The STD3
 504   restriction (rejecting '_' in host names, among other things) has been
 505   removed, for increased compatibility with non-IDN name resolution.
 506
 507 * The fcntl function now have a Long File Support variant named fcntl64.  It
 508   is added to fix some Linux Open File Description (OFD) locks usage on non
 509   LFS mode.  As for others *64 functions, fcntl64 semantics are analogous with
 510   fcntl and LFS support is handled transparently.  Also for Linux, the OFD
 511   locks act as a cancellation entrypoint.
 512
 513 * The obsolete functions encrypt, encrypt_r, setkey, setkey_r, cbc_crypt,
 514   ecb_crypt, and des_setparity are no longer available to newly linked
 515   binaries, and the headers <rpc/des_crypt.h> and <rpc/rpc_des.h> are no
 516   longer installed.  These functions encrypted and decrypted data with the
 517   DES block cipher, which is no longer considered secure.  Software that
 518   still uses these functions should switch to a modern cryptography library,
 519   such as libgcrypt.
 520
 521 * Reflecting the removal of the encrypt and setkey functions above, the
 522   macro _XOPEN_CRYPT is no longer defined.  As a consequence, the crypt
 523   function is no longer declared unless _DEFAULT_SOURCE or _GNU_SOURCE is
 524   enabled.
 525
 526 * The obsolete function fcrypt is no longer available to newly linked
 527   binaries.  It was just another name for the standard function crypt,
 528   and it has not appeared in any header file in many years.
 529
 530 * We have tentative plans to hand off maintenance of the passphrase-hashing
 531   library, libcrypt, to a separate development project that will, we hope,
 532   keep up better with new passphrase-hashing algorithms.  We will continue
 533   to declare 'crypt' in <unistd.h>, and programs that use 'crypt' or
 534   'crypt_r' should not need to change at all; however, distributions will
 535   need to install <crypt.h> and libcrypt from a separate project.
 536
 537   In this release, if the configure option --disable-crypt is used, glibc
 538   will not install <crypt.h> or libcrypt, making room for the separate
 539   project's versions of these files.  The plan is to make this the default
 540   behavior in a future release.
 541
 542 Changes to build and runtime requirements:
 543
 544   GNU make 4.0 or later is now required to build glibc.
 545
 546 Security related changes:
 547
 548   CVE-2016-6261, CVE-2016-6263, CVE-2017-14062: Various vulnerabilities have
 549   been fixed by removing the glibc-internal IDNA implementation and using
 550   the system-provided libidn2 library instead.  Originally reported by Hanno
 551   Böck and Christian Weisgerber.
 552
 553   CVE-2017-18269: An SSE2-based memmove implementation for the i386
 554   architecture could corrupt memory.  Reported by Max Horn.
 555
 556   CVE-2018-11236: Very long pathname arguments to realpath function could
 557   result in an integer overflow and buffer overflow.  Reported by Alexey
 558   Izbyshev.
 559
 560   CVE-2018-11237: The mempcpy implementation for the Intel Xeon Phi
 561   architecture could write beyond the target buffer, resulting in a buffer
 562   overflow.  Reported by Andreas Schwab.
 563
 564 The following bugs are resolved with this release:
 565
 566   [1190] stdio: fgetc()/fread() behaviour is not POSIX compliant
 567   [6889] manual: 'PWD' mentioned but not specified
 568   [13575] libc: SSIZE_MAX defined as LONG_MAX is inconsistent with ssize_t,
 569     when __WORDSIZE != 64
 570   [13762] regex: re_search etc. should return -2 on memory exhaustion
 571   [13888] build: /tmp usage during testing
 572   [13932] math: dbl-64 pow unexpectedly slow for some inputs
 573   [14092] nptl: Support C11 threads
 574   [14095] localedata: Review / update collation data from Unicode / ISO
 575     14651
 576   [14508] libc: -Wformat warnings
 577   [14553] libc: Namespace pollution loff_t in sys/types.h
 578   [14890] libc: Make NT_PRFPREG canonical.
 579   [15105] libc: Extra PLT references with -Os
 580   [15512] libc: __bswap_constant_16 not compiled when -Werror -Wsign-
 581     conversion is given
 582   [16335] manual: Feature test macro documentation incomplete and out of
 583     date
 584   [16552] libc: Unify umount implementations in terms of umount2
 585   [17082] libc: htons et al.: statement-expressions prevent use on global
 586     scope with -O1 and higher
 587   [17343] libc: Signed integer overflow in /stdlib/random_r.c
 588   [17438] localedata: pt_BR: wrong d_fmt delimiter
 589   [17662] libc: please implement binding for the new renameat2 syscall
 590   [17721] libc: __restrict defined as /* Ignore */ even in c11
 591   [17979] libc: inconsistency between uchar.h and stdint.h
 592   [18018] dynamic-link: Additional $ORIGIN handling issues (CVE-2011-0536)
 593   [18023] libc: extend_alloca is broken (questionable pointer comparison,
 594     horrible machine code)
 595   [18124] libc: hppa: setcontext erroneously returns -1 as exit code for
 596     last constant.
 597   [18471] libc: llseek should be a compat symbol
 598   [18473] soft-fp: [powerpc-nofpu] __sqrtsf2, __sqrtdf2 should be compat
 599     symbols
 600   [18991] nss: nss_files skips large entry in database
 601   [19239] libc: Including stdlib.h ends up with macros major and minor being
 602     defined
 603   [19463] libc: linknamespace failures when compiled with -Os
 604   [19485] localedata: csb_PL: Update month translations + add yesstr/nostr
 605   [19527] locale: Normalized charset name not recognized by setlocale
 606   [19667] string: Missing Sanity Check for malloc calls in file 'testcopy.c'
 607   [19668] libc: Missing Sanity Check for malloc() in file 'tst-setcontext-
 608     fpscr.c'
 609   [19728] network: out of bounds stack read in libidn function
 610     idna_to_ascii_4i (CVE-2016-6261)
 611   [19729] network: out of bounds heap read on invalid utf-8 inputs in
 612     stringprep_utf8_nfkc_normalize (CVE-2016-6263)
 613   [19818] dynamic-link: Absolute (SHN_ABS) symbols incorrectly relocated by
 614     the base address
 615   [20079] libc: Add SHT_X86_64_UNWIND to elf.h
 616   [20251] libc: 32bit programs pass garbage in struct flock for OFD locks
 617   [20419] dynamic-link: files with large allocated notes crash in
 618     open_verify
 619   [20530] libc: bswap_16 should use __builtin_bswap16() when available
 620   [20890] dynamic-link: ldconfig: fsync the files before atomic rename
 621   [20980] manual: CFLAGS environment variable replaces vital options
 622   [21163] regex: Assertion failure in pop_fail_stack when executing a
 623     malformed regexp (CVE-2015-8985)
 624   [21234] manual: use of CFLAGS makes glibc detect no optimization
 625   [21269] dynamic-link: i386 sigaction sa_restorer handling is wrong
 626   [21313] build: Compile Error GCC 5.4.0 MIPS with -0S
 627   [21314] build: Compile Error GCC 5.2.0 MIPS with -0s
 628   [21508] locale: intl/tst-gettext failure with latest msgfmt
 629   [21547] localedata: Tibetan script collation broken (Dzongkha and Tibetan)
 630   [21812] network: getifaddrs() returns entries with ifa_name == NULL
 631   [21895] libc: ppc64 setjmp/longjmp not fully interoperable with static
 632     dlopen
 633   [21942] dynamic-link: _dl_dst_substitute incorrectly handles $ORIGIN: with
 634     AT_SECURE=1
 635   [22241] localedata: New locale: Yakut (Sakha) locale for Russia (sah_RU)
 636   [22247] network: Integer overflow in the decode_digit function in
 637     puny_decode.c in libidn (CVE-2017-14062)
 638   [22342] nscd: NSCD not properly caching netgroup
 639   [22391] nptl: Signal function clear NPTL internal symbols inconsistently
 640   [22550] localedata: es_ES locale (and  other es_* locales):  collation
 641     should treat ñ  as a primary different character,  sync the collation
 642     for Spanish with CLDR
 643   [22638] dynamic-link: sparc: static binaries are broken if glibc is built
 644     by gcc configured with --enable-default-pie
 645   [22639] time: year 2039 bug for localtime etc. on 64-bit platforms
 646   [22644] string: memmove-sse2-unaligned on 32bit x86 produces garbage when
 647     crossing 2GB threshold (CVE-2017-18269)
 648   [22646] localedata: redundant data (LC_TIME) for es_CL, es_CU, es_EC and
 649     es_BO
 650   [22735] time: Misleading typo in time.h source comment regarding
 651     CLOCKS_PER_SECOND
 652   [22753] libc: preadv2/pwritev2 fallback code should handle offset=-1
 653   [22761] libc: No trailing `%n' conversion specifier in FMT passed from
 654     `__assert_perror_fail ()' to `__assert_fail_base ()'
 655   [22766] libc: all glibc internal dlopen should use RTLD_NOW for robust
 656     dlopen failures
 657   [22786] libc: Stack buffer overflow in realpath() if input size is close
 658     to SSIZE_MAX (CVE-2018-11236)
 659   [22787] dynamic-link: _dl_check_caller returns false when libc is linked
 660     through an absolute DT_NEEDED path
 661   [22792] build: tcb-offsets.h dependency dropped
 662   [22797] libc: pkey_get() uses non-reserved name of argument
 663   [22807] libc: PTRACE_* constants missing for powerpc
 664   [22818] glob: posix/tst-glob_lstat_compat failure on alpha
 665   [22827] dynamic-link: RISC-V ELF64 parser mis-reads flag in ldconfig
 666   [22830] malloc: malloc_stats doesn't restore cancellation state on stderr
 667   [22848] localedata: ca_ES: update date definitions from CLDR
 668   [22862] build: _DEFAULT_SOURCE is defined even when _ISOC11_SOURCE is
 669   [22884] math: RISCV fmax/fmin handle signalling NANs incorrectly
 670   [22896] localedata: Update locale data for an_ES
 671   [22902] math: float128 test failures with GCC 8
 672   [22918] libc: multiple common of `__nss_shadow_database'
 673   [22919] libc: sparc32: backtrace yields infinite backtrace with
 674     makecontext
 675   [22926] libc: FTBFS on powerpcspe
 676   [22932] localedata: lt_LT: Update of abbreviated month names from CLDR
 677     required
 678   [22937] localedata: Greek (el_GR, el_CY) locales actually need ab_alt_mon
 679   [22947] libc: FAIL: misc/tst-preadvwritev2
 680   [22963] localedata: cs_CZ: Add alternative month names
 681   [22987] math: [powerpc/sparc] fdim inlines errno, exceptions handling
 682   [22996] localedata: change LC_PAPER to en_US in es_BO locale
 683   [22998] dynamic-link: execstack tests are disabled when SELinux is
 684     disabled
 685   [23005] network: Crash in __res_context_send after memory allocation
 686     failure
 687   [23007] math: strtod cannot handle -nan
 688   [23024] nss: getlogin_r is performing NSS lookups when loginid isn't set
 689   [23036] regex: regex equivalence class regression
 690   [23037] libc: initialize msg_flags to zero for sendmmsg() calls
 691   [23069] libc: sigaction broken on riscv64-linux-gnu
 692   [23094] localedata: hr_HR: wrong thousands_sep and mon_thousands_sep
 693   [23102] dynamic-link: Incorrect parsing of multiple consecutive $variable
 694     patterns in runpath entries (e.g. $ORIGIN$ORIGIN)
 695   [23137] nptl: s390: pthread_join sometimes block indefinitely (on 31bit
 696     and libc build with -Os)
 697   [23140] localedata: More languages need two forms of month names
 698   [23145] libc: _init/_fini aren't marked as hidden
 699   [23152] localedata: gd_GB: Fix typo in "May" (abbreviated)
 700   [23171] math: C++ iseqsig for long double converts arguments to double
 701   [23178] nscd: sudo will fail when it is run in concurrent with commands
 702     that changes /etc/passwd
 703   [23196] string: __mempcpy_avx512_no_vzeroupper mishandles large copies
 704     (CVE-2018-11237)
 705   [23206] dynamic-link: static-pie + dlopen breaks debugger interaction
 706   [23208] localedata: New locale - Lower Sorbian (dsb)
 707   [23233] regex: Memory leak in build_charclass_op function in file
 708     posix/regcomp.c
 709   [23236] stdio: Harden function pointers in _IO_str_fields
 710   [23250] nptl: Offset of __private_ss differs from GCC
 711   [23253] math: tgamma test suite failures on i686 with -march=x86-64
 712     -mtune=generic -mfpmath=sse
 713   [23259] dynamic-link: Unsubstituted ${ORIGIN} remains in DT_NEEDED for
 714     AT_SECURE
 715   [23264] libc: posix_spawnp wrongly executes ENOEXEC in non compat mode
 716   [23266] nis: stringop-truncation warning with new gcc8.1 in nisplus-
 717     parser.c
 718   [23272] math: fma(INFINITY,INFIITY,0.0) should be INFINITY
 719   [23277] math: nan function should not have const attribute
 720   [23279] math: scanf and strtod wrong for some hex floating-point
 721   [23280] math: wscanf rounds wrong; wcstod is ok for negative numbers and
 722     directed rounding
 723   [23290] localedata: IBM273 is not equivalent to ISO-8859-1
 724   [23303] build: undefined reference to symbol
 725     '__parse_hwcap_and_convert_at_platform@@GLIBC_2.23'
 726   [23307] dynamic-link: Absolute symbols whose value is zero ignored in
 727     lookup
 728   [23313] stdio: libio vtables validation and standard file object
 729     interposition
 730   [23329] libc: The __libc_freeres infrastructure is not properly run across
 731     DSO boundaries.
 732   [23349] libc: Various glibc headers no longer compatible with
 733     <linux/time.h>
 734   [23351] malloc: Remove unused code related to heap dumps and malloc
 735     checking
 736   [23363] stdio: stdio-common/tst-printf.c has non-free license
 737   [23396] regex: Regex equivalence regression in single-byte locales
 738   [23422] localedata: oc_FR: More updates of locale data
 739   [23442] build: New warning with GCC 8
 740   [23448] libc: Out of bounds access in IBM-1390 converter
 741   [23456] libc: Wrong index_cpu_LZCNT
 742   [23458] build: tst-get-cpu-features-static isn't added to tests
 743   [23459] libc: COMMON_CPUID_INDEX_80000001 isn't populated for Intel
 744     processors
 745   [23467] dynamic-link: x86/CET: A property note parser bug
 746
 747 \f
 748 Version 2.27
 749
 750 Major new features:
 751
 752 * The GNU C Library can now be compiled with support for building static
 753   PIE executables (See --enable-static-pie in INSTALL).  These static PIE
 754   executables are like static executables but can be loaded at any address
 755   and provide additional security hardening benefits at the cost of some
 756   memory and performance.  When the library is built with --enable-static-pie
 757   the resulting libc.a is usable with GCC 8 and above to create static PIE
 758   executables using the GCC option '-static-pie'.  This feature is currently
 759   supported on i386, x86_64 and x32 with binutils 2.29 or later, and on
 760   aarch64 with binutils 2.30 or later.
 761
 762 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
 763   sinf, sincosf and tan with FMA, contributed by Arjan van de Ven and
 764   H.J. Lu from Intel.
 765
 766 * Optimized x86-64 trunc and truncf for processors with SSE4.1.
 767
 768 * Optimized generic expf, exp2f, logf, log2f, powf, sinf, cosf and sincosf.
 769
 770 * In order to support faster and safer process termination the malloc API
 771   family of functions will no longer print a failure address and stack
 772   backtrace after detecting heap corruption.  The goal is to minimize the
 773   amount of work done after corruption is detected and to avoid potential
 774   security issues in continued process execution.  Reducing shutdown time
 775   leads to lower overall process restart latency, so there is benefit both
 776   from a security and performance perspective.
 777
 778 * The abort function terminates the process immediately, without flushing
 779   stdio streams.  Previous glibc versions used to flush streams, resulting
 780   in deadlocks and further data corruption.  This change also affects
 781   process aborts as the result of assertion failures.
 782
 783 * On platforms where long double has the IEEE binary128 format (aarch64,
 784   alpha, mips64, riscv, s390 and sparc), the math library now implements
 785   _Float128 interfaces for that type, as defined by ISO/IEC TS 18661-3:2015.
 786   These are the same interfaces added in version 2.26 for some platforms where
 787   this format is supported but is not the format of long double.
 788
 789 * On platforms with support for _Float64x (aarch64, alpha, i386, ia64,
 790   mips64, powerpc64le, riscv, s390, sparc and x86_64), the math library now
 791   implements interfaces for that type, as defined by ISO/IEC TS
 792   18661-3:2015.  These are corresponding interfaces to those supported for
 793   _Float128.
 794
 795 * The math library now implements interfaces for the _Float32, _Float64 and
 796   _Float32x types, as defined by ISO/IEC TS 18661-3:2015.  These are
 797   corresponding interfaces to those supported for _Float128.
 798
 799 * glibc now implements the memfd_create and mlock2 functions on Linux.
 800
 801 * Support for memory protection keys was added.  The <sys/mman.h> header now
 802   declares the functions pkey_alloc, pkey_free, pkey_mprotect, pkey_set,
 803   pkey_get.
 804
 805 * The copy_file_range function was added.
 806
 807 * Optimized memcpy, mempcpy, memmove, and memset for sparc M7.
 808
 809 * The ldconfig utility now processes `include' directives using the C/POSIX
 810   collation ordering.  Previous glibc versions used locale-specific
 811   ordering, the change might break systems that relied on that.
 812
 813 * Support for two grammatical forms of month names has been added.
 814   In a call to strftime, the "%B" and "%b" format specifiers will now
 815   produce the grammatical form required when the month is used as part
 816   of a complete date.  New "%OB" and "%Ob" specifiers produce the form
 817   required when the month is named by itself.  For instance, in Greek
 818   and in many Slavic and Baltic languages, "%B" will produce the month
 819   in genitive case, and "%OB" will produce the month in nominative case.
 820
 821   In a call to strptime, "%B", "%b", "%h", "%OB", "%Ob", and "%Oh"
 822   are all valid and will all accept any known form of month
 823   name---standalone or complete, abbreviated or full.  In a call to
 824   nl_langinfo, the query constants MON_1..12 and ABMON_1..12 return
 825   the strings used by "%B" and "%b", respectively.  New query
 826   constants ALTMON_1..12 and _NL_ABALTMON_1..12 return the strings
 827   used by "%OB" and "%Ob", respectively.
 828
 829   In a locale definition file, use "alt_mon" and "ab_alt_mon" to
 830   define the strings for %OB and %Ob, respectively; these have the
 831   same syntax as "mon" and "abmon".  These arrays are optional; if they
 832   are not provided then they have the same content as "mon" and "abmon",
 833   respectively.
 834
 835   These features are provided for locales which define "alt_mon" and/or
 836   "ab_alt_mon" in their locale source data.  This release includes such
 837   alternative month name data for the following languages: Belarusian,
 838   Croatian, Greek, Lithuanian, Polish, Russian, and Ukrainian.
 839
 840   This feature is currently a GNU extension, but it is expected to
 841   be added to the next revision of POSIX, and it is also already
 842   available on some BSD-derived operating systems.
 843
 844   This feature will cause existing statically compiled applications
 845   to fail to load locales and fall back to the builtin C/POSIX locales.
 846   See notes below for other changes affecting compatibility.
 847
 848 * Support for the RISC-V ISA running on Linux has been added.  This port
 849   requires at least binutils-2.30, gcc-7.3.0, and linux-4.15; and is supported
 850   for the following ISA and ABI pairs:
 851
 852     - rv64imac lp64
 853     - rv64imafdc lp64
 854     - rv64imafdc lp64d
 855
 856 Deprecated and removed features, and other changes affecting compatibility:
 857
 858 * Statically compiled applications attempting to load locales compiled for the
 859   GNU C Library version 2.27 will fail and fall back to the builtin C/POSIX
 860   locale.  The reason for this is that the addition of the new "%OB" and "%Ob",
 861   support for two grammatical forms of the month names, also extends the locale
 862   data binary format.  Static applications needing locale support must be
 863   recompiled to match the runtime and data they are deployed with. In some
 864   distributions there is an upgrade window where dynamically linked applications
 865   may use a new library but the old locale data and also fall back to the
 866   builtin C/POSIX locales; restarting the application process is sufficient to
 867   fix this.
 868
 869 * Support for statically linked applications which call dlopen is deprecated
 870   and will be removed in a future version of glibc.  Applications which call
 871   dlopen need to be linked dynamically instead.
 872
 873 * Support for old programs which use internal stdio data structures and
 874   functions is deprecated.  This includes programs which use the C++ streams
 875   provided by libstdc++ in GCC 2.95.  Programs which use the internal
 876   symbols _IO_adjust_wcolumn, _IO_default_doallocate, _IO_default_finish,
 877   _IO_default_pbackfail, _IO_default_uflow, _IO_default_xsgetn,
 878   _IO_default_xsputn, _IO_doallocbuf, _IO_do_write, _IO_file_attach,
 879   _IO_file_close, _IO_file_close_it, _IO_file_doallocate, _IO_file_fopen,
 880   _IO_file_init, _IO_file_jumps, _IO_fileno, _IO_file_open,
 881   _IO_file_overflow, _IO_file_read, _IO_file_seek, _IO_file_seekoff,
 882   _IO_file_setbuf, _IO_file_stat, _IO_file_sync, _IO_file_underflow,
 883   _IO_file_write, _IO_file_xsputn, _IO_flockfile, _IO_flush_all,
 884   _IO_flush_all_linebuffered, _IO_free_backup_area, _IO_free_wbackup_area,
 885   _IO_init, _IO_init_marker, _IO_init_wmarker, _IO_iter_begin, _IO_iter_end,
 886   _IO_iter_file, _IO_iter_next, _IO_least_wmarker, _IO_link_in,
 887   _IO_list_all, _IO_list_lock, _IO_list_resetlock, _IO_list_unlock,
 888   _IO_marker_delta, _IO_marker_difference, _IO_remove_marker, _IO_seekmark,
 889   _IO_seekwmark, _IO_str_init_readonly, _IO_str_init_static,
 890   _IO_str_overflow, _IO_str_pbackfail, _IO_str_seekoff, _IO_str_underflow,
 891   _IO_switch_to_main_wget_area, _IO_switch_to_wget_mode,
 892   _IO_unsave_wmarkers, _IO_wdefault_doallocate, _IO_wdefault_finish,
 893   _IO_wdefault_pbackfail, _IO_wdefault_setbuf, _IO_wdefault_uflow,
 894   _IO_wdefault_xsgetn, _IO_wdefault_xsputn, _IO_wdoallocbuf, _IO_wdo_write,
 895   _IO_wfile_jumps, _IO_wfile_overflow, _IO_wfile_sync, _IO_wfile_underflow,
 896   _IO_wfile_xsputn, _IO_wmarker_delta, or _IO_wsetb may stop working with a
 897   future version of glibc.  Unlike other symbol removals, these old
 898   applications will not be supported using compatibility symbols.
 899
 900 * On GNU/Linux, the obsolete Linux constant PTRACE_SEIZE_DEVEL is no longer
 901   defined by <sys/ptrace.h>.
 902
 903 * libm no longer supports SVID error handling (calling a user-provided
 904   matherr function on error) or the _LIB_VERSION variable to control error
 905   handling.  (SVID error handling and the _LIB_VERSION variable still work
 906   for binaries linked against older versions of the GNU C Library.)  The
 907   libieee.a library is no longer provided.  math.h no longer defines struct
 908   exception, or the macros X_TLOSS, DOMAIN, SING, OVERFLOW, UNDERFLOW,
 909   TLOSS, PLOSS and HUGE.
 910
 911 * The libm functions pow10, pow10f and pow10l are no longer supported for
 912   new programs.  Programs should use the standard names exp10, exp10f and
 913   exp10l for these functions instead.
 914
 915 * The mcontext_t type is no longer the same as struct sigcontext.  On
 916   platforms where it was previously the same, this changes the C++ name
 917   mangling for interfaces involving this type.
 918
 919 * The add-ons mechanism for building additional packages at the same time as
 920   glibc has been removed.  The --enable-add-ons configure option is now
 921   ignored.
 922
 923 * The --without-fp configure option is now ignored.  Whether hardware
 924   floating-point instructions are used is now configured based on whether
 925   the compiler used at configure time (without any options implied by a
 926   --with-cpu= configure option) uses such instructions.
 927
 928 * The res_hnok, res_dnok, res_mailok and res_ownok functions now check that
 929   the specified string can be parsed as a domain name.
 930
 931 * In the malloc_info output, the <heap> element may contain another <aspace>
 932   element, "subheaps", which contains the number of sub-heaps.
 933
 934 * The libresolv function p_secstodate is no longer supported for new
 935   programs.
 936
 937 * The tilepro-*-linux-gnu configuration is no longer supported.
 938
 939 * The nonstandard header files <libio.h> and <_G_config.h> are deprecated
 940   and will be removed in a future release.  Software that is still using
 941   either header should be updated to use standard <stdio.h> interfaces
 942   instead.
 943
 944   libio.h was originally the header for a set of supported GNU extensions,
 945   but they have not been maintained as such in many years, they are now
 946   standing in the way of improvements to stdio, and we don't think there are
 947   any remaining external users.  _G_config.h was never intended for public
 948   use, but predates the bits convention.
 949
 950 Changes to build and runtime requirements:
 951
 952 * bison version 2.7 or later is required to generate code in the 'intl'
 953   subdirectory.
 954
 955 Security related changes:
 956
 957   CVE-2009-5064: The ldd script would sometimes run the program under
 958   examination directly, without preventing code execution through the
 959   dynamic linker.  (The glibc project disputes that this is a security
 960   vulnerability; only trusted binaries must be examined using the ldd
 961   script.)
 962
 963   CVE-2017-15670: The glob function, when invoked with GLOB_TILDE,
 964   suffered from a one-byte overflow during ~ operator processing (either
 965   on the stack or the heap, depending on the length of the user name).
 966   Reported by Tim Rühsen.
 967
 968   CVE-2017-15671: The glob function, when invoked with GLOB_TILDE,
 969   would sometimes fail to free memory allocated during ~ operator
 970   processing, leading to a memory leak and, potentially, to a denial
 971   of service.
 972
 973   CVE-2017-15804: The glob function, when invoked with GLOB_TILDE and
 974   without GLOB_NOESCAPE, could write past the end of a buffer while
 975   unescaping user names.  Reported by Tim Rühsen.
 976
 977   CVE-2017-17426: The malloc function, when called with an object size near
 978   the value SIZE_MAX, would return a pointer to a buffer which is too small,
 979   instead of NULL.  This was a regression introduced with the new malloc
 980   thread cache in glibc 2.26.  Reported by Iain Buclaw.
 981
 982   CVE-2017-1000408: Incorrect array size computation in _dl_init_paths leads
 983   to the allocation of too much memory.  (This is not a security bug per se,
 984   it is mentioned here only because of the CVE assignment.)  Reported by
 985   Qualys.
 986
 987   CVE-2017-1000409: Buffer overflow in _dl_init_paths due to miscomputation
 988   of the number of search path components.  (This is not a security
 989   vulnerability per se because no trust boundary is crossed if the fix for
 990   CVE-2017-1000366 has been applied, but it is mentioned here only because
 991   of the CVE assignment.)  Reported by Qualys.
 992
 993   CVE-2017-16997: Incorrect handling of RPATH or RUNPATH containing $ORIGIN
 994   for AT_SECURE or SUID binaries could be used to load libraries from the
 995   current directory.
 996
 997   CVE-2018-1000001: Buffer underflow in realpath function when getcwd function
 998   succeeds without returning an absolute path due to unexpected behaviour
 999   of the Linux kernel getcwd syscall.  Reported by halfdog.
1000
1001   CVE-2018-6485: The posix_memalign and memalign functions, when called with
1002   an object size near the value of SIZE_MAX, would return a pointer to a
1003   buffer which is too small, instead of NULL.  Reported by Jakub Wilk.
1004
1005   CVE-2018-6551: The malloc function, when called with an object size near
1006   the value of SIZE_MAX, would return a pointer to a buffer which is too
1007   small, instead of NULL.
1008
1009 The following bugs are resolved with this release:
1010
1011   [866] glob: glob should match dangling symlinks
1012   [1062] glob: sysdeps/generic/glob.c merge from gnulib (part 3 of 3)
1013   [2522] localedata: ca_ES@valencia: new Valencian (meridional Catalan)
1014     locale
1015   [5997] math: Very slow execution of sinf function
1016   [10580] localedata: hr_HR: updated locale
1017   [10871] locale: 'mon' array should contain both nominative and genitive
1018     cases
1019   [12349] localedata: eu_ES: incorrect thousands separator
1020   [13605] localedata: shn_MM: new Shan locale
1021   [13805] localedata: ru_RU: currency should use ',' as radix point
1022   [13953] localedata: km_KH: locale update
1023   [13994] localedata: mjw_IN: new locale
1024   [14121] build: make writes .mo files in po directory
1025   [14333] libc: Fix the race between atexit() and exit()
1026   [14681] dynamic-link: _dl_get_origin leaks memory via executable link map.
1027   [14925] localedata: bn_*: LC_IDENTIFICATION.language key should be
1028     "Bangla"
1029   [15260] localedata: LC_MESSAGES.{yes,no}{str,expr}: various errors
1030   [15261] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of full-
1031     width Latin characters
1032   [15332] localedata: es_CU: locale update
1033   [15436] stdio: Don't close or flush stdio streams on abort
1034   [15537] localedata: lv_LV: invalid collation for Latvian diacritical
1035     letters
1036   [16148] localedata: ca_ES: incorrect thousands separator
1037   [16750] dynamic-link: ldd should not try to execute the binaries
1038     (CVE-2009-5064)
1039   [16777] localedata: pl_PL: incorrect thousands separator in locale
1040   [16905] localedata: hanzi: new collation
1041   [17563] localedata: cmn_TW: add hanzi collation
1042   [17750] localedata: wrong collation order of diacritics in most locales
1043   [17804] libc: scandirat fails with ENOMEM because it checks for errno even
1044     if malloc succeeded
1045   [17956] build: Build fails on missing definitions from header file
1046     nss/nss.h when Mozilla NSS is used for cryptography
1047   [18203] libc: realpath() does not handle unreachable paths correctly
1048   [18572] dynamic-link: [arm] Lazy TLSDESC relocation has data race
1049   [18812] localedata: kab_DZ: new Kabyle Algeria locale
1050   [18822] libc: Internal functions are called via PLT
1051   [18858] string: _HAVE_STRING_ARCH_xxx aren't defined for i386 nor x86_64
1052   [19170] libc: __gmon_start__ defined in hppa in crtn.S
1053   [19574] libc: glibc should support building static PIE binaries
1054   [19852] localedata: charmaps/UTF-8: incorrect wcwidth for U+3099 and
1055     U+309A
1056   [19971] glob: glob: Do not skip entries with zero d_ino values
1057   [19982] localedata: fr.po: spelling mistake for error code EXDEV
1058   [20008] localedata: km_KH: convert to translit_neutral
1059   [20009] localedata: tr_TR: convert LC_CTYPE to i18n
1060   [20142] math: [x86_64] Add SSE4.1 trunc, truncf
1061   [20204] dynamic-link: _dl_open_hook and _dlfcn_hook hardening
1062   [20482] localedata: de_CH: abbreviated weekdays should be two letters
1063   [20498] localedata: miq_NI: new Mískitu / Miskito (miq) language locale
1064     for Nicaragua
1065   [20532] nss: getaddrinfo uses errno and h_errno without guaranteeing
1066     they're set, wrong errors returned by gaih_inet when lookup functions
1067     are not found.
1068   [20756] localedata: [PATCH] Use Unicode wise thousands separator
1069   [20826] network: posix/tst-getaddrinfo5 fails on hosts without network
1070     access
1071   [20952] localedata: yuw_PG: new locale
1072   [21084] localedata: charmaps/IBM858: new codepage
1073   [21161] manual: [PATCH] fix typo in manual/arith.texi on strtoul prototype
1074   [21242] libc: assert gives pedantic warning in old gcc versions
1075   [21265] dynamic-link: _dl_runtime_resolve isn't compatible with Intel C++
1076     __regcall calling convention
1077   [21309] math: signed integer overflow in sysdeps/ieee754/dbl-64/e_pow.c
1078   [21326] libc: C99 functions are not declared for C++11 and later if
1079     _GNU_SOURCE is not predefined by g++
1080   [21457] libc: sys/ucontext.h namespace
1081   [21530] libc: tmpfile() should be implemented using O_TMPFILE
1082   [21660] math: GCC fails to compile a formula with tgmath.h
1083   [21672] nptl: sys-libs/glibc on ia64 crashes on thread exit: signal
1084     SIGSEGV, Segmentation fault: pthread_create.c:432: __madvise
1085     (pd->stackblock, freesize - PTHREAD_STACK_MIN, MADV_DONTNEED);
1086   [21684] math: tgmath.h handling of complex integers
1087   [21685] math: tgmath.h handling of bit-fields
1088   [21686] math: tgmath.h handling of __int128
1089   [21706] localedata: yesstr and nostr  are missing for Breton [LC_MESSAGES]
1090     locale
1091   [21745] libc: [powerpc64le] Extra PLT reference with --enable-stack-
1092     protector=all
1093   [21750] localedata: column width of characters incompatible with classical
1094     wcwidth
1095   [21754] malloc: malloc: Perform as little work as possible after heap
1096     consistency check failures
1097   [21780] libc: hppa: p{read,write}v2 does not set ENOSUP on invalid flag
1098   [21790] libc: Missing __memset_zero_constant_len_parameter in libc.so
1099   [21791] string: Unused XXX_chk_XXX functions in libc.a
1100   [21815] dynamic-link: FAIL: elf/tst-prelink-cmp with GCC is defaulted to
1101     PIE
1102   [21836] localedata: Removed redundant data (LC_MONETARY) in various Indian
1103     locales
1104   [21845] localedata: Added new Locale bho_NP
1105   [21853] localedata: Fix abday Which looks same as day in zh_SG
1106   [21854] localedata: Added New Locale en_SC
1107   [21864] libc: xmalloc.o is compiled with -DMODULE_NAME=libc
1108   [21871] dynamic-link: _dl_runtime_resolve_avx_opt is slower than
1109     _dl_runtime_resolve_avx_slow
1110   [21885] network: getaddrinfo: gethosts does not release resolver context
1111     on memory allocation failure
1112   [21899] libc: XPG4.2 sigaction namespace
1113   [21908] dynamic-link: dynamic linker broke on ia64 (mmap2 consolidation is
1114     the suspect)
1115   [21913] libc: static binaries SIGSEGV in __brk when host's gcc is pie-by-
1116     default (i386)
1117   [21915] nss: nss_files can return with NSS_STATUS_SUCCESS and a clobbered
1118     errno value, causing getaddrinfo to fail
1119   [21920] localedata: Fix p_cs_precedes/n_cs_precedes for mt_MT
1120   [21922] network: getaddrinfo with AF_INET/AF_INET6 returns EAI_NONAME
1121     instead of EAI_NODATA
1122   [21928] libc: sys/ptrace.h: remove obsolete temporary development Linux
1123     constant PTRACE_SEIZE_DEVEL
1124   [21930] math: C-only gcc builtins used in <math.h> isinf
1125   [21932] network: Unpaired __resolv_context_get in generic get*_r
1126     implementation
1127   [21941] math: powerpc: Wrong register constraint for xssqrtqp in sqrtf128
1128   [21944] libc: sigval namespace
1129   [21951] localedata: Update hanzi collation by stroke
1130   [21955] math: Wrong alignment of  L(SP_RANGE)/L(SP_INF_0) in
1131     sysdeps/x86_64/fpu/e_expf.S
1132   [21956] libc: Stack allocation in MIPS syscall impl (ubounded stack
1133     allocation in syscall loops)
1134   [21959] localedata: Fix Country name for xh_ZA
1135   [21960] localedata: Fix abmon for bem_ZM
1136   [21966] math: AVX2 mathvec functions use FMA without checking
1137   [21967] math: When 512-bit AVX2 wrapper functions in mathvec are used?
1138   [21971] localedata: Added New Locale for mfe_MU
1139   [21972] libc: assert macro requires operator== (int) for its argument type
1140   [21973] math: [sparc] libm missing sqrtl compat symbol
1141   [21974] libc: Remove __bb_init_func and __bb_exit_func
1142   [21982] string: stratcliff.c: error: assuming signed overflow does not
1143     occur with -O3
1144   [21986] stdio: __guess_grouping is called incorrectly
1145   [21987] math: [sparc32] wrong bits/long-double.h installed
1146   [22019] localedata: Wrong placement of monetary symbol in el_GR (negative
1147     amounts)
1148   [22022] localedata: Missing country_name for mni_IN
1149   [22023] localedata: Removed redundant data (LC_TIME and LC_MESSAGES) for
1150     niu_NZ
1151   [22025] locale: iconv: Inconsistency between pointer mangling and NULL
1152     checks
1153   [22026] locale: iconv_open: heap overflow on gconv_init failure
1154   [22028] math: bits/math-finite.h _MSUF_ expansion namespace
1155   [22035] math: [m68k] bits/math-inline.h macro namespace
1156   [22038] localedata: Fix abbreviated weeks and months for Somali
1157   [22044] localedata: Remove redundant data for Limburgish Language
1158   [22050] malloc: Linking with -lmcheck does not hook
1159     __malloc_initialize_hook correctly
1160   [22051] libc: zero terminator in the middle of glibc's .eh_frame
1161   [22052] malloc: malloc failed to compile with GCC 7 and -O3
1162   [22070] localedata: charmaps/UTF-8: wcwidth for
1163     Prepended_Concatenation_Mark codepoints set to 0 (should be 1)
1164   [22074] localedata: charmaps/UTF-8: wcwidth for U+1160-U+11FF (Hangul
1165     Jungseong and Jongseong) should be 0
1166   [22078] nss: nss_files performance issue in multi mode
1167   [22082] math: bits/math-finite.h exp10 condition
1168   [22086] libc: pcprofiledump incorrect cross-endian condition
1169   [22093] dynamic-link: ld.so no longer searches in .../x86_64
1170   [22095] network: Name server address allocation memory leak in resolv.conf
1171     parsing after OOM
1172   [22096] network: __resolv_conf_attach can incorrectly free passed conf
1173     object
1174   [22100] localedata: om_KE: LC_TIME: copy redundant data from om_ET
1175   [22101] dynamic-link: Dynamic loader must ignore "debug" shared objects
1176     e.g. ET_GNU_DEBUG_*
1177   [22111] malloc: malloc: per thread cache is not returned when thread exits
1178   [22112] localedata: Fix LC_TELEPHONE/LC_NAME for az_AZ
1179   [22134] libc: [linux] implement fexecve with execveat
1180   [22142] libc: [powerpc] printf oupts a wrong value of DBL_MAX on ppc64 and
1181     ppc64le
1182   [22145] libc: ttyname() gives up too early in the face of namespaces
1183   [22146] math: C++ build issue with float128 on x86_64
1184   [22153] nptl: nptl: save error code before process termination
1185   [22156] libc: [hppa,ia64,microblaze] Executable stack default
1186   [22159] malloc: malloc: MALLOC_CHECK_ broken with --enable-tunables=no
1187   [22161] nscd: nscd cache prune for netgroups hangs after timeout bump
1188   [22165] libc: [hppa] Text relocations in libc.so
1189   [22180] libc: destructor registered via __cxa_atexit is called twice
1190   [22183] glob: commit 5554304f0ddd ("posix: Allow glob to match dangling
1191     symlinks") cause "make" segfaults
1192   [22189] math: [powerpc] math_private.h definitions of math_opt_barrier and
1193     math_force_eval
1194   [22207] libc: FAIL: stdlib/test-atexit-race
1195   [22225] math: nearbyint arithmetic moved before feholdexcept
1196   [22229] math: [sparc32] missing copysignl, fabsl, fmal compat symbols
1197   [22235] math: iscanonical in C++ and float128
1198   [22243] math: log2(0) and log10(0) are wrong in downward rounding without
1199     the svid compat wrapper
1200   [22244] math: ynf and yn are wrong without the svid compat wrapper
1201   [22273] libc: Improper assert in Linux posix_spawn implementation
1202   [22284] libc: -pg -pie doesn't work
1203   [22292] locale: localedef exits with error 4 when it should be error 1
1204   [22294] locale: Allow "" for int_currency_symbol definition in locales.
1205   [22295] locale: Don't warn on non-symbolic characters in locale sources in
1206     --verbose.
1207   [22296] math: glibc 2.26: signbit build issue with Gcc 5.5.0 on x86_64
1208   [22298] nptl: x32: lockups on recursive pthread_mutex_lock after upgrade
1209     to 2.26
1210   [22299] dynamic-link: Problem with $PLATFORM on x86_64 platform
1211   [22320] glob: Buffer overflow in glob with GLOB_TILDE (CVE-2017-15670)
1212   [22321] libc: sysconf(_SC_IOV_MAX) returns -1 on Linux
1213   [22322] libc: [mips64] wrong bits/long-double.h installed
1214   [22325] glob: Memory leak in glob with GLOB_TILDE (CVE-2017-15671)
1215   [22332] glob: Buffer overflow in glob with GLOB_TILDE in unescaping
1216     (CVE-2017-15804)
1217   [22336] localedata: cs_CZ LC_COLLATE does not use i18n
1218   [22343] malloc: Integer overflow in posix_memalign
1219   [22347] libc: getrandom() returns the number of bytes that were copied  to
1220     the buffer even though the comments say "Return 0 on success and -1 on
1221     failure."
1222   [22353] string: sysdeps/i386/i586/strcpy.S isn't maintainable
1223   [22362] libc: Installed crt1.o, crti,.o and crtn.o files are used with
1224     -m32
1225   [22370] dynamic-link: Incorrect note padding check
1226   [22375] libc: malloc returns pointer from tcache_get when should return
1227     NULL (CVE-2017-17426)
1228   [22377] math: iseqsig, float128 and C++
1229   [22382] localedata: Error in tpi_PG locale
1230   [22387] localedata: Replace unicode sequences <Uxxxx> for characters
1231     inside the ASCII printable range
1232   [22402] math: [powerpc64le] __MATH_TG does not support _Float128 for
1233     -mlong-double-64
1234   [22403] localedata: Slash needs escaping in some locales
1235   [22408] malloc: malloc_info access heaps without arena lock, ignores heaps
1236   [22409] network: res_hnok does not accept some host names used on the
1237     Internet
1238   [22412] network: res_dnok, res_hnok should perform syntax checks
1239   [22413] network: ns_name_pton ignores syntactically invalid trailing
1240     backslash
1241   [22415] stdio: setvbuf can lead to invalid free/segfault
1242   [22432] build: Non-deterministic build
1243   [22439] malloc: malloc_info should compute summary statistics for all sub-
1244     heaps in an arena
1245   [22442] network: if_nametoindex could report index for the wrong
1246     networking interface
1247   [22446] build: aliasing violation calling readlink in handle_request
1248   [22447] build: unsafe call to strlen with a non-string in getlogin_r.c
1249   [22457] libc: Generic preadv/pwritev incorrectly calls __posix_memalign
1250   [22459] libc: FAIL: elf/check-localplt with __stack_chk_fail related to
1251     __nscd_hash/__nss_hash
1252   [22463] network: p_secstodate overflow handling
1253   [22469] localedata: pl_PL LC_COLLATE does not use i18n
1254   [22478] libc: sigwait can fail with EINTR
1255   [22505] libc: ldconfig processes include directive in locale-specific
1256     order
1257   [22515] localedata: hsb_DE LC_COLLATE does not use copy "iso14651_t1"
1258   [22517] localedata: et_EE LC_COLLATE does not use copy "iso14651_t1"
1259   [22519] localedata: is_IS LC_COLLATE does not use copy "iso14651_t1"
1260   [22524] localedata: lt_LT  LC_COLLATE does not use copy "iso14651_t1"
1261   [22527] localedata: tr_TR  LC_COLLATE does not use copy "iso14651_t1"
1262   [22534] localedata: Collation rules for Serbian and Bosnian should be the
1263     same as for Croatian
1264   [22561] math: [DR#471] cacosh (0 + iNaN) should return NaN +/- i pi/2
1265   [22568] math: [DR#471] ctanh (0 + iNaN), ctanh (0 + i Inf)
1266   [22577] libc: missing newline after "cannot allocate TLS data structures
1267     for initial thread"
1268   [22588] manual: manual/conf.texi: missing underscore in front of
1269     SC_SSIZE_MAX
1270   [22593] math: nextafter and nexttoward are declared with const attribute
1271   [22596] manual: manual: finite(nan) wrongly described as returning nonzero
1272   [22603] string: ia64 memchr overflows internal pointer check
1273   [22605] libc: SH clone does not set the exit code correctly
1274   [22606] dynamic-link: Incorrect array size computation in _dl_init_paths
1275     (CVE-2017-1000408)
1276   [22607] dynamic-link: Buffer Overflow in _dl_init_paths (CVE-2017-1000409)
1277   [22611] malloc: malloc/tst-realloc wrongly assumes that errno must not be
1278     modified in case of success
1279   [22614] build: gcc: error: unrecognized command line option ‘-no-pie’
1280   [22615] manual: manual: ambiguous wording about errno value in case of
1281     success
1282   [22624] libc: MIPS setjmp() saves incorrect 'o0' register in --enable-
1283     stack-protector=all
1284   [22625] dynamic-link: RPATH $ORIGIN replaced by PWD for AT_SECURE/SUID
1285     binaries or if /proc is not mounted (CVE-2017-16997)
1286   [22627] dynamic-link: $ORIGIN in $LD_LIBRARY_PATH is substituted twice
1287   [22630] build: $(no-pie-ldflag) is no longer effective
1288   [22631] math: [m68k] Bad const attributes in bits/mathinline.h
1289   [22635] nptl: pthread_self returns NULL before libpthread is loaded
1290   [22636] nptl: PTHREAD_STACK_MIN is too small on x86-64
1291   [22637] nptl: guard size is subtracted from thread stack size instead of
1292     adding it on top
1293   [22648] libc: getrlimit/setrlimit with RLIM_INFINITY broken on alpha
1294   [22657] localedata: hu_HU: Avoid double space in date
1295   [22660] math: fmax, fmin sNaN handling on alpha
1296   [22664] libc: New warning of GCC8
1297   [22665] math: alpha: ceil and floor raise inexact exceptions
1298   [22666] math: alpha: trunc raise inexact exceptions
1299   [22667] libc: makecontext lacks stack alignment on i386
1300   [22678] libc: prlimit fails for RLIM_INFINITY values on 32-bit machines
1301   [22679] libc: getcwd(3) can succeed without returning an absolute path
1302     (CVE-2018-1000001)
1303   [22685] libc: PowerPC: Static AT_SECURE binaries segfault with lock-
1304     elision and tunables
1305   [22687] math: [powerpc-nofpu] complex long double functions spurious
1306     "invalid" exception
1307   [22688] math: [powerpc-nofpu] remainderl wrong sign of zero result
1308   [22690] math: [ldbl-128ibm] lrintl, lroundl missing "invalid" exceptions
1309   [22691] math: [powerpc-nofpu] fmaxmagl, fminmagl spurious "invalid"
1310     exception
1311   [22693] math: [ldbl-128ibm] log1pl (-qNaN) spurious "invalid" exception
1312   [22697] math: [powerpc] llround spurious "inexact" exceptions on 32-bit
1313     power4
1314   [22701] nis: Incomplete removal of libnsl
1315   [22702] math: [powerpc-nofpu] nearbyintl traps with trapping "inexact"
1316   [22707] libc: Missing defines in elf.h for DF_1_STUB and DF_1_PIE.
1317   [22715] dynamic-link: FAIL: elf/tst-audit10
1318   [22719] libc: Backtrace tests fail on hppa
1319   [22742] libc: [aarch64] mcontext_t __reserved field got renamed
1320   [22743] nptl: __pthread_register_cancel corrupts stack after f81ddabffd
1321   [22765] crypt: (struct crypt_data *data)->initialized is not set to zero
1322     before the first call to crypt_r () in crypt/badsalttest.c
1323
1324 \f
1325 Version 2.26
1326
1327 Major new features:
1328
1329 * A per-thread cache has been added to malloc. Access to the cache requires
1330   no locks and therefore significantly accelerates the fast path to allocate
1331   and free small amounts of memory. Refilling an empty cache requires locking
1332   the underlying arena. Performance measurements show significant gains in a
1333   wide variety of user workloads. Workloads were captured using a special
1334   instrumented malloc and analyzed with a malloc simulator. Contributed by
1335   DJ Delorie with the help of Florian Weimer, and Carlos O'Donell.
1336
1337 * Unicode 10.0.0 Support: Character encoding, character type info, and
1338   transliteration tables are all updated to Unicode 10.0.0, using
1339   generator scripts contributed by Mike FABIAN (Red Hat).
1340   These updates cause user visible changes, especially the changes in
1341   wcwidth for many emoji characters cause problems when emoji sequences
1342   are rendered with pango, see for example:
1343   https://bugzilla.gnome.org/show_bug.cgi?id=780669#c5
1344
1345 * Collation of Hungarian has been overhauled and is now consistent with "The
1346   Rules of Hungarian Orthography, 12th edition" (Bug 18934).  Contributed by
1347   Egmont Koblinger.
1348
1349 * Improvements to the DNS stub resolver, contributed by Florian Weimer:
1350
1351   - The GNU C Library will now detect when /etc/resolv.conf has been
1352     modified and reload the changed configuration.  The new resolver option
1353     “no-reload” (RES_NORELOAD) disables this behavior.
1354
1355   - The GNU C Library now supports an arbitrary number of search domains
1356     (configured using the “search” directive in /etc/resolv.conf);
1357     previously, there was a hard limit of six domains.  For backward
1358     compatibility, applications that directly modify the ‘_res’ global
1359     object are still limited to six search domains.
1360
1361   - When the “rotate” (RES_ROTATE) resolver option is active, the GNU C
1362     Library will now randomly pick a name server from the configuration as a
1363     starting point.  (Previously, the second name server was always used.)
1364
1365 * The tunables feature is now enabled by default.  This allows users to tweak
1366   behavior of the GNU C Library using the GLIBC_TUNABLES environment variable.
1367
1368 * New function reallocarray, which resizes an allocated block (like realloc)
1369   to the product of two sizes, with a guaranteed clean failure upon integer
1370   overflow in the multiplication.  Originally from OpenBSD, contributed by
1371   Dennis Wölfing and Rüdiger Sonderfeld.
1372
1373 * New wrappers for the Linux-specific system calls preadv2 and pwritev2.
1374   These are extended versions of preadv and pwritev, respectively, taking an
1375   additional flags argument.  The set of supported flags depends on the
1376   running kernel; full support currently requires kernel 4.7 or later.
1377
1378 * posix_spawnattr_setflags now supports the flag POSIX_SPAWN_SETSID, to
1379   create a new session ID for the spawned process.  This feature is
1380   scheduled to be added to the next major revision of POSIX; for the time
1381   being, it is available under _GNU_SOURCE.
1382
1383 * errno.h is now safe to use from C-preprocessed assembly language on all
1384   supported operating systems.  In this context, it will only define the
1385   Exxxx constants, as preprocessor macros expanding to integer literals.
1386
1387 * On ia64, powerpc64le, x86-32, and x86-64, the math library now implements
1388   128-bit floating point as defined by ISO/IEC/IEEE 60559:2011 (IEEE
1389   754-2008) and ISO/IEC TS 18661-3:2015.  Contributed by Paul E. Murphy,
1390   Gabriel F. T. Gomes, Tulio Magno Quites Machado Filho, and Joseph Myers.
1391
1392   To compile programs that use this feature, the compiler must support
1393   128-bit floating point with the type name _Float128 (as defined by TS
1394   18661-3) or __float128 (the nonstandard name used by GCC for C++, and for
1395   C prior to version 7).  _GNU_SOURCE or __STDC_WANT_IEC_60559_TYPES_EXT__
1396   must be defined to make the new interfaces visible.
1397
1398   The new functions and macros correspond to those present for other
1399   floating-point types (except for a few obsolescent interfaces not
1400   supported for the new type), with F128 or f128 suffixes; for example,
1401   strtof128, HUGE_VAL_F128 and cosf128.  Following TS 18661-3, there are no
1402   printf or scanf formats for the new type; the strfromf128 and strtof128
1403   interfaces should be used instead.
1404
1405 Deprecated and removed features, and other changes affecting compatibility:
1406
1407 * The synchronization that pthread_spin_unlock performs has been changed to
1408   now be equivalent to a C11 atomic store with release memory order to the
1409   spin lock's memory location.  Previously, several (but not all)
1410   architectures used stronger synchronization (e.g., containing what is
1411   often called a full barrier).  This change can improve performance, but
1412   may affect odd fringe uses of spin locks that depend on the previous
1413   behavior (e.g., using spin locks as atomic variables to try to implement
1414   Dekker's mutual exclusion algorithm).
1415
1416 * The port to Native Client running on ARMv7-A (--host=arm-nacl) has been
1417   removed.
1418
1419 * Sun RPC is deprecated.  The rpcgen program, librpcsvc, and Sun RPC headers
1420   will only be built and installed when the GNU C Library is configured with
1421   --enable-obsolete-rpc.  This allows alternative RPC implementations, such
1422   as TIRPC or rpcsvc-proto, to be used.
1423
1424 * The NIS(+) name service modules, libnss_nis, libnss_nisplus, and
1425   libnss_compat, are deprecated, and will not be built or installed by
1426   default.
1427
1428   The NIS(+) support library, libnsl, is also deprecated.  By default, a
1429   compatibility shared library will be built and installed, but not headers
1430   or development libraries. Only a few NIS-related programs require this
1431   library.  (In particular, the GNU C Library has never required programs
1432   that use 'gethostbyname' to be linked with libnsl.)
1433
1434   Replacement implementations based on TIRPC, which additionally support
1435   IPv6, are available from <https://github.com/thkukuk/>.  The configure
1436   option --enable-obsolete-nsl will cause libnsl's headers, and the NIS(+)
1437   name service modules, to be built and installed.
1438
1439 * The DNS stub resolver no longer performs EDNS fallback.  If EDNS or DNSSEC
1440   support is enabled, the configured recursive resolver must support EDNS.
1441   (Responding to EDNS-enabled queries with responses which are not
1442   EDNS-enabled is fine, but FORMERR responses are not.)
1443
1444 * res_mkquery and res_nmkquery no longer support the IQUERY opcode.  DNS
1445   servers have not supported this opcode for a long time.
1446
1447 * The _res_opcodes variable has been removed from libresolv.  It had been
1448   exported by accident.
1449
1450 * <string.h> no longer includes inline versions of any string functions,
1451   as this kind of optimization is better done by the compiler.  The macros
1452   __USE_STRING_INLINES and __NO_STRING_INLINES no longer have any effect.
1453
1454 * The nonstandard header <xlocale.h> has been removed.  Most programs should
1455   use <locale.h> instead.  If you have a specific need for the definition of
1456   locale_t with no other declarations, please contact
1457   libc-alpha@sourceware.org and explain.
1458
1459 * The obsolete header <sys/ultrasound.h> has been removed.
1460
1461 * The obsolete signal constant SIGUNUSED is no longer defined by <signal.h>.
1462
1463 * The obsolete function cfree has been removed.  Applications should use
1464   free instead.
1465
1466 * The stack_t type no longer has the name struct sigaltstack.  This changes
1467   the C++ name mangling for interfaces involving this type.
1468
1469 * The ucontext_t type no longer has the name struct ucontext.  This changes
1470   the C++ name mangling for interfaces involving this type.
1471
1472 * On M68k GNU/Linux and MIPS GNU/Linux, the fpregset_t type no longer has
1473   the name struct fpregset.  On Nios II GNU/Linux, the mcontext_t type no
1474   longer has the name struct mcontext.  On SPARC GNU/Linux, the struct
1475   mc_fq, struct rwindow, struct fpq and struct fq types are no longer
1476   defined in sys/ucontext.h, the mc_fpu_t type no longer has the name struct
1477   mc_fpu, the gwindows_t type no longer has the name struct gwindows and the
1478   fpregset_t type no longer has the name struct fpu.  This changes the C++
1479   name mangling for interfaces involving those types.
1480
1481 * On S/390 GNU/Linux, the constants defined by <sys/ptrace.h> have been
1482   synced with the kernel:
1483
1484     - PTRACE_GETREGS, PTRACE_SETREGS, PTRACE_GETFPREGS and PTRACE_SETFPREGS
1485       are not supported on this architecture and have been removed.
1486
1487     - PTRACE_SINGLEBLOCK, PTRACE_SECCOMP_GET_FILTER, PTRACE_PEEKUSR_AREA,
1488       PTRACE_POKEUSR_AREA, PTRACE_GET_LAST_BREAK, PTRACE_ENABLE_TE,
1489       PTRACE_DISABLE_TE and PTRACE_TE_ABORT_RAND have been added.
1490
1491   Programs that assume the GET/SETREGS ptrace requests are universally
1492   available will now fail to build, instead of malfunctioning at runtime.
1493
1494 Changes to build and runtime requirements:
1495
1496 * Linux kernel 3.2 or later is required at runtime, on all architectures
1497   supported by that kernel.  (This is a change from version 2.25 only for
1498   x86-32 and x86-64.)
1499
1500 * GNU Binutils 2.25 or later is now required to build the GNU C Library.
1501
1502 * On most architectures, GCC 4.9 or later is required to build the GNU C
1503   Library.  On powerpc64le, GCC 6.2 or later is required.
1504
1505   Older GCC versions and non-GNU compilers are still supported when
1506   compiling programs that use the GNU C Library.  (We do not know exactly
1507   how old, and some GNU extensions to C may be _de facto_ required.  If you
1508   are interested in helping us make this statement less vague, please
1509   contact libc-alpha@sourceware.org.)
1510
1511 Security related changes:
1512
1513 * The DNS stub resolver limits the advertised UDP buffer size to 1200 bytes,
1514   to avoid fragmentation-based spoofing attacks (CVE-2017-12132).
1515
1516 * LD_LIBRARY_PATH is now ignored in binaries running in privileged AT_SECURE
1517   mode to guard against local privilege escalation attacks (CVE-2017-1000366).
1518
1519 * Avoid printing a backtrace from the __stack_chk_fail function since it is
1520   called on a corrupt stack and a backtrace is unreliable on a corrupt stack
1521   (CVE-2010-3192).
1522
1523 * A use-after-free vulnerability in clntudp_call in the Sun RPC system has been
1524   fixed (CVE-2017-12133).
1525
1526 The following bugs are resolved with this release:
1527
1528   [984] network: Respond to changed resolv.conf in gethostbyname
1529   [5010] network: sunrpc service cleanup causes unwanted port mapper traffic
1530   [12068] localedata: sc_IT: misspelled yesexpr/day/abday/mon/abmon/date_fmt
1531     fields
1532   [12189] libc: __stack_chk_fail should not attempt a backtrace
1533     (CVE-2010-3192)
1534   [14096] time: Race condition on timezone/tst-timezone.out
1535   [14172] localedata: az_IR: new locale
1536   [14995] build: glibc fails to build if gold is the default linker, even if
1537     ld.bfd is available
1538   [15998] build: [powerpc] Set arch_minimum_kernel for powerpc LE
1539   [16637] network: inet_pton function is accepting IPv6 with bad format
1540   [16640] string: string/strtok.c: undefined behaviour inconsistent between
1541     x86 and other generic code
1542   [16875] localedata: ko_KR: fix lang_name
1543   [17225] localedata: ar_SY: localized month names for May and June are
1544     incorrect
1545   [17297] localedata: da_DK: wrong date_fmt string
1546   [18907] stdio: Incorrect order of __wur __THROW in <printf.h>
1547   [18934] localedata: hu_HU: collate: fix multiple bugs and add tests
1548   [18988] nptl: pthread wastes memory with mlockall(MCL_FUTURE)
1549   [19066] localedata: ar_SA abbreviated day and month names are in English
1550   [19569] network: resolv: Support an arbitrary number of search domains
1551   [19570] network: Implement random DNS server selection in the stub
1552     resolver
1553   [19838] locale: localedef fails on PA-RISC
1554   [19919] localedata: iso14651_t1_common: Correct the Malayalam sorting
1555     order of 0D36 and 0D37
1556   [19922] localedata: iso14651_t1_common: Define collation for Malayalam
1557     chillu characters
1558   [20098] libc: FAIL: debug/backtrace-tst on hppa
1559   [20257] network: sunrpc: clntudp_call does not enforce timeout when
1560     receiving data
1561   [20275] localedata: locale day/abday/mon/abmon should not have trailing
1562     whitespace
1563   [20313] localedata: Update locale data to Unicode 9.0
1564   [20424] manual: Document how to provide a malloc replacement
1565   [20496] localedata: agr_PE: new language locale Awajún / Aguaruna (agr)
1566     for Peru
1567   [20686] locale: Add el_GR@euro to SUPPORTED.
1568   [20831] dynamic-link: _dl_map_segments does not test for __mprotect
1569     failures consistently
1570   [21015] dynamic-link: Document and fix --enable-bind-now
1571   [21016] nptl: pthread_cond support is broken on hppa
1572   [21029] libc: glibc-2.23 (and later) fails to compile with -fno-omit-
1573     frame-pointer on i386
1574   [21049] libc: segfault in longjmp_chk() due to clobbered processor
1575     register
1576   [21075] libc: unused assigment to %g4 in sparc/sparc{64,32}/clone.S
1577   [21088] libc: Build fails with --enable-static-nss
1578   [21094] math: cosf(1.57079697) has 3 ulp error on targets where the
1579     generic c code is used
1580   [21109] libc: Tunables broken on big-endian
1581   [21112] math: powf has large ulp errors with base close to 1 and exponent
1582     around 4000
1583   [21115] network: sunrpc: Use-after-free in error path in clntudp_call
1584     (CVE-2017-12133)
1585   [21120] malloc: glibc malloc is incompatible with GCC 7
1586   [21130] math: Incorrect return from y0l (-inf) and y1l (-inf) when linking
1587     with -lieee
1588   [21134] math: Exception (divide by zero) not set for y0/y1 (0.0) and y0/y1
1589     (-0.0) when linking with -lieee
1590   [21171] math: log10, log2 and lgamma return incorrect results
1591   [21179] libc: handle R_SPARC_DISP64 and R_SPARC_REGISTER relocs
1592   [21182] libc: __memchr_sse2: regression in glibc-2.25 on i686
1593   [21207] localedata: ce_RU: update weekdays from CLDR
1594   [21209] dynamic-link: LD_HWCAP_MASK read in setuid binaries
1595   [21217] localedata: Update months from CLDR-31
1596   [21232] libc: miss posix_fadvise64 on MIPS64 when static linking
1597   [21243] libc: support_delete_temp_file should issue warning for failed
1598     remove()
1599   [21244] libc: support resolv_test_start() socket fd close should be
1600     checked for errors.
1601   [21253] libc: localedef randomly segfaults when using -fstack-check due to
1602     new posix_spawn implementation
1603   [21258] dynamic-link: Branch predication in _dl_runtime_resolve_avx512_opt
1604     leads to lower CPU frequency
1605   [21259] libc: [alpha] termios.h missing IXANY for POSIX
1606   [21261] libc: [sparc64] bits/setjmp.h namespace
1607   [21267] network: [mips] bits/socket.h IOC* namespace
1608   [21268] libc: [alpha] termios.h NL2, NL3 namespace
1609   [21270] libc: mmap64 silently truncates large offset values
1610   [21275] libc: posix_spawn always crashes on ia64 now
1611   [21277] libc: [alpha] termios.h missing IUCLC for UNIX98 and older
1612   [21280] math: [powerpc] logbl for POWER7 return incorrect results
1613   [21289] libc: Incorrect declaration for 32-bit platforms with
1614     _FILE_OFFSET_BITS=64 causes build error
1615   [21295] network: GETAI(AF_UNSPEC) drops IPv6 addresses if nss module does
1616     not support gethostbyname4_r
1617   [21298] nptl: rwlock can deadlock on frequent reader/writer phase
1618     switching
1619   [21338] malloc: mallopt M_ARENA_MAX doesn't set the maximum number of
1620     arenas
1621   [21340] libc: Support POSIX_SPAWN_SETSID
1622   [21357] libc: unwind-dw2-fde deadlock when using AddressSanitizer
1623   [21359] network: ns_name_pack needs additional byte in destination buffer
1624   [21361] network: resolv: Reduce advertised EDNS0 buffer size to guard
1625     against fragmentation attacks (CVE-2017-12132)
1626   [21369] network: resolv: Remove EDNS fallback
1627   [21371] libc: Missing timespec definition when compiled with _XOPEN_SOURCE
1628     and _POSIX_C_SOURCE
1629   [21386] nptl: Assertion in fork for distinct parent PID is incorrect
1630   [21391] dynamic-link: x86: Set dl_platform and dl_hwcap from CPU features
1631   [21393] stdio: Missing dup3 error check in freopen, freopen64
1632   [21396] libc: Use AVX2 memcpy/memset on Skylake server
1633   [21399] localedata: Bad description for U00EC in
1634     localedata/charmaps/CP1254
1635   [21411] malloc: realloc documentation error
1636   [21426] network: sys/socket.h uio.h namespace
1637   [21428] libc: [aarch64] tst-backtrace5 testsuite failure
1638   [21445] libc: signal.h bsd_signal namespace
1639   [21455] network: Network headers stdint.h namespace
1640   [21474] network: resolv: res_init does not use RES_DFLRETRY (2) but 4 for
1641     retry value
1642   [21475] network: resolv: Overlong search path is truncated mid-label
1643   [21511] libc: sigstack namespace
1644   [21512] libc: clone() ends up calling exit_group() through _exit() wrapper
1645   [21514] libc: sysdeps/unix/sysv/linux/sys/syscall.h:31:27: fatal error:
1646     bits/syscall.h: No  such file or directory
1647   [21517] libc: struct sigaltstack namespace
1648   [21528] dynamic-link: Duplicated minimal strtoul implementations in ld.so
1649   [21533] localedata: Update locale data to Unicode 10.0
1650   [21537] libc:
1651     ../sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:44: Error:
1652     junk at end of line, first unrecognized character is `@'
1653   [21538] libc: SIG_HOLD missing for XPG4
1654   [21539] libc: S390: Mismatch between kernel and glibc ptrace.h with
1655     request 12: PTRACE_SINGLEBLOCK vs PTRACE_GETREGS.
1656   [21542] libc: Use conservative default for sysconf (_SC_NPROCESSORS_ONLN)
1657   [21543] libc: sigevent namespace
1658   [21548] libc: [mips] get/set/make/swap context for MIPS O32 assume wrong
1659     size for general purpose registers in mcontext_t structure
1660   [21550] libc: sigwait namespace
1661   [21552] libc: XPG4 bsd_signal namespace
1662   [21554] libc: sigpause namespace
1663   [21560] libc: sys/wait.h signal.h namespace
1664   [21561] libc: waitid namespace
1665   [21573] nptl: GCC 7: /usr/bin/install: cannot remove
1666     '/usr/include/stdlib.h': Permission denied
1667   [21575] libc: sys/wait.h missing struct rusage definition
1668   [21584] libc: sigaltstack etc namespace
1669   [21597] libc: siginterrupt namespace
1670   [21607] math: hppa: FAIL: math/test-tgmath
1671   [21609] dynamic-link: Incomplete workaround for GCC __tls_get_addr ABI
1672     issue on x86-64
1673   [21622] libc: [tile] missing SA_* for POSIX.1:2008
1674   [21624] dynamic-link: ld.so: Unsafe alloca allows local attackers to alias
1675     stack and heap (CVE-2017-1000366)
1676   [21625] libc: wait3 namespace
1677   [21654] nss: Incorrect pointer alignment in NSS group merge result
1678     construction
1679   [21657] network: Parse interface zone id for node-local multicast
1680   [21662] string: memcmp-avx2-movbe.S lacks saturating subtraction for
1681     between_2_3
1682   [21666] libc: .symver is used on common symbol
1683   [21668] network: resolv: res_init cross-thread broadcast introduces race
1684     conditions
1685   [21687] math: tgmath.h totalorder, totalordermag return type
1686   [21694] locale: Current Glibc Locale Does Not Support Tok-Pisin and Fiji
1687     Hindi Locale
1688   [21696] libc: Incorrect assumption of of __cpu_mask in
1689     posix/sched_cpucount.c
1690   [21697] libc: sysdeps/posix/spawni.c: 2 * suspicious condition ?
1691   [21706] localedata: yesstr and nostr  are missing for Breton [LC_MESSAGES]
1692     locale
1693   [21707] math: ppc64le: Invalid IFUNC resolver from libgcc calls getauxval,
1694     leading to relocation crash
1695   [21709] libc: resolv_conf.c:552: update_from_conf: Assertion
1696     `resolv_conf_matches (resp, conf)' failed.
1697   [21710] localedata: Added Samoan language locale for Samoa
1698   [21711] localedata: Pashto yesstr/nostr locale are missing
1699   [21715] nptl: sysdeps/nptl/bits/pthreadtypes.h: typedef guard
1700     __have_pthread_attr_t can cause redefinition of typedef ‘pthread_attr_t’
1701   [21721] localedata: Incorrect Full Weekday names for ks_IN@devanagari
1702   [21723] localedata: yesstr/nostr missing for Chinese language locale
1703   [21724] localedata: yesstr and nostr  are missing for  Xhosa [LC_MESSAGES]
1704     locale
1705   [21727] localedata: yesstr and nostr  are missing for Tsonga [LC_MESSAGES]
1706     locale
1707   [21728] localedata: New Locale for Tongan language
1708   [21729] localedata: incorrect LC_NAME fields for hi_IN
1709   [21733] localedata: yesstr and nostr  are missing for zh_HK
1710   [21734] localedata: Missing yesstr and nostr  are for kw_GB
1711   [21738] libc: misc/tst-preadvwritev2 and misc/tst-preadvwritev64v2 fail
1712   [21741] libc: Undefined __memmove_chk_XXX and __memset_chk_XXX in libc.a
1713   [21742] libc: _dl_num_cache_relocations is undefined in libc.a
1714   [21743] localedata: ks_IN@devanagari: abday strings mismatch the day
1715     strings
1716   [21744] libc: Tests failing on --enable-tunables --enable-stack-
1717     protector=all
1718   [21749] localedata: Wrong abbreviated day name (“abday”) for
1719     ar_JO/ar_LB/ar_SY
1720   [21756] localedata: missing yesstr, nostr  for nds_DE and nds_NL
1721   [21757] localedata: missing yesstr, nostr  for pap_AW and pap_CW
1722   [21759] localedata: missing yesstr and nostr for Tigrinya
1723   [21760] localedata: Fix LC_MESSAGES and LC_ADDRESS for anp_IN
1724   [21766] localedata: Wrong LC_MESSAGES for om_ET Locale
1725   [21767] localedata: Missing Bislama locales
1726   [21768] localedata: Missing yesstr and nostr for aa_ET
1727   [21770] localedata: Missing  Field in li_NL
1728   [21778] nptl: Robust mutex may deadlock
1729   [21779] libc: MicroBlaze segfaults when loading libpthread
1730   [21783] localedata: Fix int_select international_call_prefixes
1731   [21784] localedata: Inconsistency  in country_isbn
1732   [21788] localedata: Missing  Country Postal Abbreviations
1733   [21794] localedata: Added-country_isbn-for-Italy
1734   [21795] localedata: Add/Fix country_isbn for France
1735   [21796] localedata: Added country_isbn for Republic of Korea
1736   [21797] localedata: Fix inconsistency in country_isbn and missing prefixes
1737   [21799] localedata: Added int_select international_call_prefixes
1738   [21801] localedata: Added int_select international_call_prefixes
1739   [21804] nptl: Double semicolon in thread-shared-types.h
1740   [21807] localedata: LC_ADDRESS fix for pap_CW
1741   [21808] localedata: Fix LC_ADDRESS for pap_AW
1742   [21821] localedata: Added country_name in mai_IN
1743   [21822] localedata: Fix LC_TIME for mai_IN
1744   [21823] localedata: missing yesstr, nostr  for sa_IN
1745   [21825] localedata: Fix name_mrs for mag_IN
1746   [21828] localedata: 2.26 changelog should mention user visible changes
1747     with unicode 9.0
1748   [21835] localedata: Added Maithili language locale for Nepal
1749   [21838] localedata: Removed redundant data for the_NP
1750   [21839] localedata: Fix LC_MONETARY for ta_LK
1751   [21844] localedata: Fix Latin characters and Months Sequence.
1752   [21848] localedata: Fix mai_NP Title Name
1753
1754 \f
1755 Version 2.25
1756
1757 * The feature test macro __STDC_WANT_LIB_EXT2__, from ISO/IEC TR
1758   24731-2:2010, is supported to enable declarations of functions from that
1759   TR.  Note that not all functions from that TR are supported by the GNU C
1760   Library.
1761
1762 * The feature test macro __STDC_WANT_IEC_60559_BFP_EXT__, from ISO/IEC TS
1763   18661-1:2014, is supported to enable declarations of functions and macros
1764   from that TS.  Note that not all features from that TS are supported by
1765   the GNU C Library.
1766
1767 * The feature test macro __STDC_WANT_IEC_60559_FUNCS_EXT__, from ISO/IEC TS
1768   18661-4:2015, is supported to enable declarations of functions and macros
1769   from that TS.  Note that most features from that TS are not supported by
1770   the GNU C Library.
1771
1772 * The nonstandard feature selection macros _REENTRANT and _THREAD_SAFE are
1773   now treated as compatibility synonyms for _POSIX_C_SOURCE=199506L.
1774   Since the GNU C Library defaults to a much newer revision of POSIX, this
1775   will only affect programs that specifically request an old conformance
1776   mode.  For instance, a program compiled with -std=c89 -D_REENTRANT will
1777   see a change in the visible declarations, but a program compiled with
1778   just -D_REENTRANT, or -std=c99 -D_POSIX_C_SOURCE=200809L -D_REENTRANT,
1779   will not.
1780
1781   Some C libraries once required _REENTRANT and/or _THREAD_SAFE to be
1782   defined by all multithreaded code, but glibc has not required this for
1783   many years.
1784
1785 * The inclusion of <sys/sysmacros.h> by <sys/types.h> is deprecated.  This
1786   means that in a future release, the macros “major”, “minor”, and “makedev”
1787   will only be available from <sys/sysmacros.h>.
1788
1789   These macros are not part of POSIX nor XSI, and their names frequently
1790   collide with user code; see for instance glibc bug 19239 and Red Hat bug
1791   130601.  <stdlib.h> includes <sys/types.h> under _GNU_SOURCE, and C++ code
1792   presently cannot avoid being compiled under _GNU_SOURCE, exacerbating the
1793   problem.
1794
1795 * New <fenv.h> features from TS 18661-1:2014 are added to libm: the
1796   fesetexcept, fetestexceptflag, fegetmode and fesetmode functions, the
1797   femode_t type and the FE_DFL_MODE and FE_SNANS_ALWAYS_SIGNAL macros.
1798
1799 * Integer width macros from TS 18661-1:2014 are added to <limits.h>:
1800   CHAR_WIDTH, SCHAR_WIDTH, UCHAR_WIDTH, SHRT_WIDTH, USHRT_WIDTH, INT_WIDTH,
1801   UINT_WIDTH, LONG_WIDTH, ULONG_WIDTH, LLONG_WIDTH, ULLONG_WIDTH; and to
1802   <stdint.h>: INT8_WIDTH, UINT8_WIDTH, INT16_WIDTH, UINT16_WIDTH,
1803   INT32_WIDTH, UINT32_WIDTH, INT64_WIDTH, UINT64_WIDTH, INT_LEAST8_WIDTH,
1804   UINT_LEAST8_WIDTH, INT_LEAST16_WIDTH, UINT_LEAST16_WIDTH,
1805   INT_LEAST32_WIDTH, UINT_LEAST32_WIDTH, INT_LEAST64_WIDTH,
1806   UINT_LEAST64_WIDTH, INT_FAST8_WIDTH, UINT_FAST8_WIDTH, INT_FAST16_WIDTH,
1807   UINT_FAST16_WIDTH, INT_FAST32_WIDTH, UINT_FAST32_WIDTH, INT_FAST64_WIDTH,
1808   UINT_FAST64_WIDTH, INTPTR_WIDTH, UINTPTR_WIDTH, INTMAX_WIDTH,
1809   UINTMAX_WIDTH, PTRDIFF_WIDTH, SIG_ATOMIC_WIDTH, SIZE_WIDTH, WCHAR_WIDTH,
1810   WINT_WIDTH.
1811
1812 * New <math.h> features are added from TS 18661-1:2014:
1813
1814   - Signaling NaN macros: SNANF, SNAN, SNANL.
1815
1816   - Nearest integer functions: roundeven, roundevenf, roundevenl, fromfp,
1817     fromfpf, fromfpl, ufromfp, ufromfpf, ufromfpl, fromfpx, fromfpxf,
1818     fromfpxl, ufromfpx, ufromfpxf, ufromfpxl.
1819
1820   - llogb functions: the llogb, llogbf and llogbl functions, and the
1821     FP_LLOGB0 and FP_LLOGBNAN macros.
1822
1823   - Max-min magnitude functions: fmaxmag, fmaxmagf, fmaxmagl, fminmag,
1824     fminmagf, fminmagl.
1825
1826   - Comparison macros: iseqsig.
1827
1828   - Classification macros: iscanonical, issubnormal, iszero.
1829
1830   - Total order functions: totalorder, totalorderf, totalorderl,
1831     totalordermag, totalordermagf, totalordermagl.
1832
1833   - Canonicalize functions: canonicalize, canonicalizef, canonicalizel.
1834
1835   - NaN functions: getpayload, getpayloadf, getpayloadl, setpayload,
1836     setpayloadf, setpayloadl, setpayloadsig, setpayloadsigf, setpayloadsigl.
1837
1838 * The functions strfromd, strfromf, and strfroml, from ISO/IEC TS 18661-1:2014,
1839   are added to libc.  They convert a floating-point number into string.
1840
1841 * Most of glibc can now be built with the stack smashing protector enabled.
1842   It is recommended to build glibc with --enable-stack-protector=strong.
1843   Implemented by Nick Alcock (Oracle).
1844
1845 * The function explicit_bzero, from OpenBSD, has been added to libc.  It is
1846   intended to be used instead of memset() to erase sensitive data after use;
1847   the compiler will not optimize out calls to explicit_bzero even if they
1848   are "unnecessary" (in the sense that no _correct_ program can observe the
1849   effects of the memory clear).
1850
1851 * On ColdFire, MicroBlaze, Nios II and SH3, the float_t type is now defined
1852   to float instead of double.  This does not affect the ABI of any libraries
1853   that are part of the GNU C Library, but may affect the ABI of other
1854   libraries that use this type in their interfaces.
1855
1856 * On x86_64, when compiling with -mfpmath=387 or -mfpmath=sse+387, the
1857   float_t and double_t types are now defined to long double instead of float
1858   and double.  These options are not the default, and this does not affect
1859   the ABI of any libraries that are part of the GNU C Library, but it may
1860   affect the ABI of other libraries that use this type in their interfaces,
1861   if they are compiled or used with those options.
1862
1863 * The getentropy and getrandom functions, and the <sys/random.h> header file
1864   have been added.
1865
1866 * The buffer size for byte-oriented stdio streams is now limited to 8192
1867   bytes by default.  Previously, on Linux, the default buffer size on most
1868   file systems was 4096 bytes (and thus remains unchanged), except on
1869   network file systems, where the buffer size was unpredictable and could be
1870   as large as several megabytes.
1871
1872 * The <sys/quota.h> header now includes the <linux/quota.h> header.  Support
1873   for the Linux quota interface which predates kernel version 2.4.22 has
1874   been removed.
1875
1876 * The malloc_get_state and malloc_set_state functions have been removed.
1877   Already-existing binaries that dynamically link to these functions will
1878   get a hidden implementation in which malloc_get_state is a stub.  As far
1879   as we know, these functions are used only by GNU Emacs and this change
1880   will not adversely affect already-built Emacs executables.  Any undumped
1881   Emacs executables, which normally exist only during an Emacs build, should
1882   be rebuilt by re-running “./configure; make” in the Emacs build tree.
1883
1884 * The “ip6-dotint” and “no-ip6-dotint” resolver options, and the
1885   corresponding RES_NOIP6DOTINT flag from <resolv.h> have been removed.
1886   “no-ip6-dotint” had already been the default, and support for the
1887   “ip6-dotint” option was removed from the Internet in 2006.
1888
1889 * The "ip6-bytestring" resolver option and the corresponding RES_USEBSTRING
1890   flag from <resolv.h> have been removed.  The option relied on a
1891   backwards-incompatible DNS extension which was never deployed on the
1892   Internet.
1893
1894 * The flags RES_AAONLY, RES_PRIMARY, RES_NOCHECKNAME, RES_KEEPTSIG,
1895   RES_BLAST defined in the <resolv.h> header file have been deprecated.
1896   They were already unimplemented.
1897
1898 * The "inet6" option in /etc/resolv.conf and the RES_USE_INET6 flag for
1899   _res.flags are deprecated.  The flag was standardized in RFC 2133, but
1900   removed again from the IETF name lookup interface specification in RFC
1901   2553.  Applications should use getaddrinfo instead.
1902
1903 * DNSSEC-related declarations and definitions have been removed from the
1904   <arpa/nameser.h> header file, and libresolv will no longer attempt to
1905   decode the data part of DNSSEC record types.  Previous versions of glibc
1906   only implemented minimal support for the previous version of DNSSEC, which
1907   is incompatible with the currently deployed version.
1908
1909 * The resource record type classification macros ns_t_qt_p, ns_t_mrr_p,
1910   ns_t_rr_p, ns_t_udp_p, ns_t_xfr_p have been removed from the
1911   <arpa/nameser.h> header file because the distinction between RR types and
1912   meta-RR types is not officially standardized, subject to revision, and
1913   thus not suitable for encoding in a macro.
1914
1915 * The types res_sendhookact, res_send_qhook, re_send_rhook, and the qhook
1916   and rhook members of the res_state type in <resolv.h> have been removed.
1917   The glibc stub resolver did not support these hooks, but the header file
1918   did not reflect that.
1919
1920 * For multi-arch support it is recommended to use a GCC which has
1921   been built with support for GNU indirect functions.  This ensures
1922   that correct debugging information is generated for functions
1923   selected by IFUNC resolvers.  This support can either be enabled by
1924   configuring GCC with '--enable-gnu-indirect-function', or by
1925   enabling it by default by setting 'default_gnu_indirect_function'
1926   variable for a particular architecture in the GCC source file
1927   'gcc/config.gcc'.
1928
1929 * GDB pretty printers have been added for mutex and condition variable
1930   structures in POSIX Threads. When installed and loaded in gdb these pretty
1931   printers show various pthread variables in human-readable form when read
1932   using the 'print' or 'display' commands in gdb.
1933
1934 * Tunables feature added to allow tweaking of the runtime for an application
1935   program.  This feature can be enabled with the '--enable-tunables' configure
1936   flag.  The GNU C Library manual has details on usage and README.tunables has
1937   instructions on adding new tunables to the library.
1938
1939 * A new version of condition variables functions have been implemented in
1940   the NPTL implementation of POSIX Threads to provide stronger ordering
1941   guarantees.
1942
1943 * A new version of pthread_rwlock functions have been implemented to use a more
1944   scalable algorithm primarily through not using a critical section anymore to
1945   make state changes.
1946
1947 Security related changes:
1948
1949 * On ARM EABI (32-bit), generating a backtrace for execution contexts which
1950   have been created with makecontext could fail to terminate due to a
1951   missing .cantunwind annotation.  This has been observed to lead to a hang
1952   (denial of service) in some Go applications compiled with gccgo.  Reported
1953   by Andreas Schwab.  (CVE-2016-6323)
1954
1955 * The DNS stub resolver functions would crash due to a NULL pointer
1956   dereference when processing a query with a valid DNS question type which
1957   was used internally in the implementation.  The stub resolver now uses a
1958   question type which is outside the range of valid question type values.
1959   (CVE-2015-5180)
1960
1961 The following bugs are resolved with this release:
1962
1963   [4099] stdio: Overly agressive caching by stream i/o functions.
1964   [7065] build: Support building glibc with -fstack-protector or -fstack-
1965     protector-all
1966   [9842] localedata: en_CA: incorrect date format
1967   [13165] nptl: pthread_cond_wait() can consume a signal that was sent
1968     before it started waiting
1969   [14139] manual: Do not hardcode platform names in manual/libm-err-tab.pl
1970   [15765] nptl: sem_open is wrongly a cancellation point
1971   [16421] network: IN6_IS_ADDR_UNSPECIFIED can use undefined s6_addr32
1972   [16458] libc: endian.h and netinet/in.h byte order macros return values of
1973     wrong type
1974   [16628] dynamic-link: Segfault after a binary without pthread dlopen()s a
1975     library linked with pthread
1976   [16630] nptl: Use SYSENTER for pthread_cond_broadcast/signal() (i.e. fix
1977     "FIXME: Ingo" issue)
1978   [16907] libc: <argp.h> compiled with --std=cXX disables __attribute__
1979   [17252] libc: getrandom and getentropy syscall
1980   [17730] malloc: thread-local storage is sometimes improperly free()'d
1981     after being __libc_memalign()'d
1982   [18241] stdio: failed fseek on memstream does not set errno and can fail
1983     when it shouldnt
1984   [18243] nptl: sem_wait, sem_timedwait are cancellation points shm_open is
1985     not
1986   [18463] nptl: pthread_cond_broadcast issue when surrounded by
1987     PTHREAD_PRIO_INHERIT mutex on ARM
1988   [18784] network: res_query and related function crash for special record
1989     type queries (CVE-2015-5180)
1990   [19380] math: strtod does not raise "inexact"
1991   [19387] string: Integer overflow in memchr
1992   [19390] string: Integer overflow in strncat
1993   [19398] build: linknamespace tests fail with massively parallel build
1994   [19402] nptl: Deadlock with robust shared mutex and asynchronous
1995     termination
1996   [19469] malloc: M_PERTURB in test-skeleton.c invalidates malloc tests
1997   [19473] malloc: Turn malloc_get_state etc. in compatibility symbols
1998   [19514] libc: [PATCH] Fix spelling errors in spelling
1999     "implement"/"implementation" in several places
2000   [19582] network: Deprecate RES_USE_INET6
2001   [19673] manual: clog10 docs appear to be erroneous
2002   [19810] dynamic-link: dlopen with both RTLD_NOLOAD and RTLD_NODELETE
2003     causes a segmentation fault
2004   [19826] libc: invalid pointer returned from __tls_get_addr with static
2005     linking
2006   [20016] network: resolv: Remove hooks support from the API
2007   [20019] dynamic-link: NULL pointer dereference in libc.so.6 IFUNC due to
2008     uninitialized GOT
2009   [20033] math: [x86_64] vectorized math function don't call the __finite
2010     versions
2011   [20116] nptl: use after free in pthread_create
2012   [20181] stdio: open_memstream(): writes not at end of stream corrupt data
2013   [20292] dynamic-link: Comparison in elf/dl-open.c _dl_addr_inside_object
2014     is always true.
2015   [20311] nptl: please install proc_service.h
2016   [20366] libc: Compilation errors in installed headers in strict-compliance
2017     modes
2018   [20370] malloc: malloc: Arena free list management is still racy
2019     (incorrect fix in bug 19243)
2020   [20386] libc: assert (X = 0) does not result in GCC warning
2021   [20432] malloc: malloc: Minimize interface required for interposition
2022   [20435] libc: Missing unwind info in __startcontext causes infinite loop
2023     in _Unwind_Backtrace (CVE-2016-6323)
2024   [20444] hurd: recvmsg: PF_LOCAL sockets and msg_name lead to SIGLOST
2025   [20452] nptl: Addition of sysdep.o to libpthread.a breaks relinking
2026     libpthread.a
2027   [20455] math: [powerpc] fesetexceptflag fails to clear FE_INVALID
2028   [20459] localedata: et_EE: locale has wrong {p,n}_cs_precedes value
2029   [20477] network: resolv: incorrect double-checked locking related to
2030     _res_hconf
2031   [20478] libc: libc_ifunc macro and similar usages leads to false debug-
2032     information.
2033   [20495] math: x86_64 performance degradation due to AVX/SSE transition
2034     penalty
2035   [20497] localedata: lt_LT: LC_TIME d_fmt used is obsolete
2036   [20508] dynamic-link: _dl_runtime_resolve_avx/_dl_runtime_profile_avx512
2037     cause transition penalty
2038   [20517] math: sparcv9 missing fdiml compat symbol
2039   [20524] manual: strverscmp is inconsistent
2040   [20525] libc: <sys/quota.h> should be based on kernel headers
2041   [20539] math: GCC 7 -static -lm fails to link at -O3
2042   [20554] libc: ld: bss-plt forced due to /usr/lib/libc_nonshared.a(ppc-
2043     mcount.oS)
2044   [20558] string: POSIX bcopy/bzero decls do not implement Object Size
2045     Checking
2046   [20591] network: Remove obsolete DNSSEC support
2047   [20592] network: DNS resource record type classification macros in
2048     <arpa/nameser.h> are incorrect
2049   [20593] network: Update DNS RR type definitions
2050   [20611] network: getaddrinfo accepts invalid numeric scope IDs
2051   [20615] build: glibc build fails when using --with-cpu=power9 --enable-
2052     multi-arch
2053   [20629] network: libresolv: Remove support for bitstring labels
2054     (RES_USEBSTRING)
2055   [20647] libc: GLIBC quitting every program - glibc on Pentium-S leads to
2056     assertion: "maxidx >= 2"
2057   [20660] math: [arm] Use VSQRT
2058   [20662] libc: checking whether x86_64-pc-linux-gnu-gcc implicitly enables
2059     -fstack-protector no (32bit gcc 6.2.0 pie and ssp enable)
2060   [20689] libc: Test for FMA should also check for AVX.
2061   [20707] glob: gl_pathv entries not set to NULL with GLOB_DOOFFS
2062   [20715] math: iszero macro breaks existing code
2063   [20718] math: [powerpc] copysignl raises "invalid" for sNaN
2064   [20728] libc: powerpc: Missing TOC stub in clone
2065   [20729] build: glibc-2.24 fails to build for i486 with -Os
2066   [20750] build: Build fails with default PIE enabled gcc-6.x
2067   [20768] math: [alpha] sqrt fegetenv namespace
2068   [20785] libc: binutils 2.28 fails to assemble power6/memset.S file in
2069     glibc
2070   [20787] math: float_t is defined as float incorrectly on x86_64 even if
2071     __FLT_EVAL_METHOD__ is 2
2072   [20790] network: rpcgen buffer overrun in get_prog_declaration
2073   [20822] nptl: race condition in __lll_unlock_elision on powerpc
2074   [20829] libc: crypt snprintf namespace
2075   [20847] libc: tst-vfork3 failure
2076   [20855] math: Default bits/mathdef.h has inappropriate float_t
2077   [20859] math: [sh4] FP_ILOGB0 invalid
2078   [20864] localedata: iconv: cp936 missing single-byte euro sign (0x80,
2079     U+20AC), not same as GBK
2080   [20915] dynamic-link: global-dynamic TLS broken on aarch64
2081   [20916] math: pow handling of sNaN arguments
2082   [20918] build: Building with --enable-nss-crypt fails tst-linkall-static.
2083   [20919] math: Bad pow (qNaN, 0) result with -lieee
2084   [20940] math: hypot sNaN handling
2085   [20947] math: fmax, fmin sNaN handling
2086   [20956] libc: debug/tst-backtrace3-6 don't work with -O3 anymore
2087   [20964] network: sunrpc: Stack-based buffer overflow in getrpcport with
2088     RES_USE_INET6
2089   [20971] string: powerpc64/power7 memchr overflows internal pointer check
2090   [20973] nptl: robust mutexes: Lost wake-ups
2091   [20974] locale: bs_BA: yesexpr/noexpr regexes accept any character
2092   [20978] nis: strlen on null pointer in nss_nisplus
2093   [20985] nptl: robust mutexes: lowlevelrobustlock assembly on x86 blocks on
2094     wrong condition
2095   [21014] string: i686 memchr overflows internal pointer check
2096   [21019] libc: [mips] n32 lseek incorrect on overflow
2097   [21022] libc: [microblaze] __backtrace get_frame_size namespace
2098   [21026] libc: [MIPS] readahead syscall is broken on n64
2099   [21028] math: Fallback fesetexceptflag should always succeed
2100   [21045] libc: [powerpc-nofpu] swapcontext does not restore signal mask
2101   [21047] math: arm: fpu_control.h: _FPU_GETCW/_FPU_SETCW is rejected by
2102     clang
2103   [21053] libc: [SH] Namespace pollution from sys/ucontext.h
2104   [21061] librt: [microblaze] librt lost clock_* exports
2105   [21073] libc: tunables: insecure environment variables passed to
2106     subprocesses with AT_SECURE
2107   [21081] string: Missing vzeroupper in memset-vec-unaligned-erms.S
2108 \f
2109 Version 2.24
2110
2111 * The minimum Linux kernel version that this version of the GNU C Library
2112   can be used with is 3.2, except on i[4567]86 and x86_64, where Linux
2113   kernel version 2.6.32 or later suffices (on architectures that already
2114   required kernel versions more recent than 3.2, those requirements remain
2115   unchanged).  Linux 3.2 or later kernel headers are required on all
2116   architectures.
2117
2118 * The pap_AN locale has been deleted.  This has been deprecated for a long
2119   time.  It has been replaced by pap_AW & pap_CW, both of which have long
2120   been included in previous releases.
2121
2122 * The readdir_r and readdir64_r functions have been deprecated.  It is
2123   recommended to use readdir and readdir64 instead.
2124
2125 * The type “union wait” has been removed.  It was deprecated in the early
2126   1990s and never part of POSIX.  Application code should use the int type
2127   instead of “union wait”.
2128
2129 * A new NSS action is added to facilitate large distributed system
2130   administration.  The action, MERGE, allows remote user stores like LDAP
2131   to be merged into local user stores like /etc/groups in order to provide
2132   easy to use, updated, and managed sets of merged credentials.  The new
2133   action can be used by configuring it in /etc/nsswitch.conf:
2134   group: files [SUCCESS=merge] nis
2135   Implemented by Stephen Gallagher (Red Hat).
2136
2137 * The deprecated __malloc_initialize_hook variable has been removed from the
2138   API.
2139
2140 * The long unused localedef --old-style option has been removed.  It hasn't
2141   done anything in over 16 years.  Scripts using this option can safely
2142   drop it.
2143
2144 * nextupl, nextup, nextupf, nextdownl, nextdown and nextdownf are added to
2145   libm.  They are defined by TS 18661 and IEEE754-2008.  The nextup functions
2146   return the next representable value in the direction of positive infinity
2147   and the nextdown functions return the next representable value in the
2148   direction of negative infinity.  These are currently enabled as GNU
2149   extensions.
2150
2151 Security related changes:
2152
2153 * An unnecessary stack copy in _nss_dns_getnetbyname_r was removed.  It
2154   could result in a stack overflow when getnetbyname was called with an
2155   overly long name.  (CVE-2016-3075)
2156
2157 * Previously, getaddrinfo copied large amounts of address data to the stack,
2158   even after the fix for CVE-2013-4458 has been applied, potentially
2159   resulting in a stack overflow.  getaddrinfo now uses a heap allocation
2160   instead.  Reported by Michael Petlan.  (CVE-2016-3706)
2161
2162 * The glob function suffered from a stack-based buffer overflow when it was
2163   called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
2164   Reported by Alexander Cherepanov.  (CVE-2016-1234)
2165
2166 * The Sun RPC UDP client could exhaust all available stack space when
2167   flooded with crafted ICMP and UDP messages.  Reported by Aldy Hernandez'
2168   alloca plugin for GCC.  (CVE-2016-4429)
2169
2170 * The IPv6 name server management code in libresolv could result in a memory
2171   leak for each thread which is created, performs a failing naming lookup,
2172   and exits.  Over time, this could result in a denial of service due to
2173   memory exhaustion.  Reported by Matthias Schiffer.  (CVE-2016-5417)
2174
2175 The following bugs are resolved with this release:
2176
2177   [1170] localedata: ne_NP: update Nepali locale definition file
2178   [3629] manual: stpcpy description in string.texi refers to MS-DOG instead
2179     of MS-DOS.
2180   [6527] malloc: [powerpc] Malloc alignment insufficient for PowerPC
2181   [6796] math: fdim() does not set errno on overflow
2182   [10354] libc: posix_spawn should use vfork() in more cases than presently
2183   [11213] localedata: localedata: add copyright disclaimer to locale files
2184   [12143] localedata: chr_US: new Cherokee locale
2185   [12450] localedata: sgs_LT: new locale
2186   [12676] localedata: ln_CD: new locale
2187   [13237] localedata: LC_ADDRESS.country_name: update all locales w/latest
2188     CLDR data
2189   [13304] math: fma, fmaf, fmal produce wrong results
2190   [14259] build: --localedir arg to configure is ignored
2191   [14499] nptl: Does posix_spawn invoke atfork handlers / use vfork?
2192   [14750] libc: Race condition in posix_spawn vfork usage vs signal handlers
2193   [14934] localedata: es_CL: wrong first weekday chilean locale
2194   [15262] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of
2195     romanisation
2196   [15263] localedata: LC_MESSAGES.yesexpr/noexpr: inconsistent use of 1/0
2197     and +/-
2198   [15264] localedata: LC_MESSAGES.yesstr/nostr: lacking in many locales
2199   [15368] nptl: raise() is not async-signal-safe
2200   [15479] math: ceil, floor, round and trunc raise inexact exception
2201   [15578] localedata: kk_KZ: various updates
2202   [16003] localedata: pap_AN: punt old locale
2203   [16137] localedata: iw_IL: punt old locale
2204   [16190] localedata: eo: new esperanto locale
2205   [16374] localedata: lv_LV: change currency symbol in LC_MONETARY to euro
2206   [16742] malloc: race condition: pthread_atfork() called before first
2207     malloc() results in unexpected locking behaviour/deadlocks
2208   [16975] localedata: LC_MESSAGES.yesexpr/noexpr: revisit capitalization in
2209     all locales
2210   [16983] localedata: postal_fmt does not allow %l and %n modifiers
2211   [17565] localedata: pt_PT: wrong (work-)week start
2212   [17899] math: [powerpc] floorl returns negative zero with FE_DOWNWARD
2213   [17950] build: Build fails with -msse
2214   [18205] localedata: be_BY*: wrong first_weekday and first_workday
2215   [18433] libc: posix_spawn does not return correctly upon failure to
2216     execute
2217   [18453] localedata: charmaps/IBM875: incorrect codes
2218   [18712] string: bits/string2.h incompatible with -O2 -Werror=packed
2219     -Wsystem-headers
2220   [18896] localedata: he_IL: improvements for currency
2221   [18911] localedata: ro_RO: Correcting week day name for "Tuesday" in
2222     Romanian locale data
2223   [18960] locale: s390: _nl_locale_subfreeres uses larl opcode on misaligned
2224     symbol
2225   [19056] libc: Deprecate readdir_r
2226   [19133] localedata: pt_*: days & months should be lowercase in Portuguese
2227     language
2228   [19198] localedata: nl_NL: small improvements for Dutch locales
2229   [19257] network: Per-thread memory leak in __res_vinit with IPv6
2230     nameservers (CVE-2016-5417)
2231   [19269] build: tst-audit4 and tst-audit10 failures with gcc-6 on non avx
2232     machine
2233   [19400] locale: Language missing in  "iso-639.def", trivial fix in
2234     description
2235   [19431] malloc: Deadlock between fflush, getdelim, and fork
2236   [19505] libc: Incorrect file descriptor validity checks in
2237     posix_spawn_file_actions_add{open,close,dup2}
2238   [19509] dynamic-link: dlsym, dlvsym do not report errors through dlerror
2239     when using RTLD_NEXT
2240   [19512] locale: Stale `#ifndef HAVE_BUILTIN_EXPECT' in
2241     `intl/{gettextP,loadinfo}.h'
2242   [19534] libc: execle, execlp may use malloc
2243   [19568] localedata: *_CH: Swiss locales have inconsistent start of week
2244   [19573] network: res_nclose and __res_maybe_init disagree about name
2245     server initialization, breaking Hesiod
2246   [19575] localedata: Status of GB18030 tables
2247   [19581] localedata: sr_* date_fmt string contains additional newline
2248   [19583] string: SSSE3_Fast_Copy_Backward flag needs to be enabled for AMD
2249     Excavator core
2250   [19592] math: [ldbl-128ibm] ceill incorrect in non-default rounding modes
2251   [19593] math: [ldbl-128ibm] truncl incorrect in non-default rounding modes
2252   [19594] math: [ldbl-128ibm] roundl incorrect in non-default rounding modes
2253   [19595] math: [ldbl-128ibm] fmodl incorrect for results in subnormal
2254     double range
2255   [19602] math: [ldbl-128ibm] fmodl handling of equal arguments with low
2256     part zero incorrect
2257   [19603] math: [ldbl-128ibm] remainderl, remquol incorrect sign handling in
2258     equality tests
2259   [19610] dynamic-link: ldconfig -X removes stale symbolic links
2260   [19613] libc: s390x (64 bit) macro expansion WCOREDUMP and others
2261   [19633] locale: strfmon_l applies global locale to number formatting
2262   [19642] network: Memory leak in getnameinfo
2263   [19648] libc: test-skeleton.c: Do not set RLIMIT_DATA
2264   [19653] libc: Potential for NULL pointer dereference (CWE-476) in
2265     glibc-2.22
2266   [19654] math: [x86_64] Need testcase for BZ #19590 fix
2267   [19671] localedata: Missing Sanity Check for malloc() in 'tst-fmon.c' &
2268     'tst-numeric.c'
2269   [19674] math: [ldbl-128ibm] powl incorrect overflow handling
2270   [19677] math: [ldbl-128ibm] remainderl equality test incorrect for zero
2271     low part
2272   [19678] math: [ldbl-128ibm] nextafterl, nexttowardl incorrect sign of zero
2273     result
2274   [19679] dynamic-link: gcc-4.9.3 C++ exception handling broken due to
2275     unaligned stack
2276   [19726] locale: Converting UCS4LE to INTERNAL with iconv() does not update
2277     pointers and lengths in error-case.
2278   [19727] locale: Converting from/to UTF-xx with iconv() does not always
2279     report errors on UTF-16 surrogates values.
2280   [19755] nscd: nscd assertion failure in gc
2281   [19758] dynamic-link: Typo in EXTRA_LD_ENVVARS for x86-64
2282   [19759] libc: mempcpy shouldn't be inlined
2283   [19762] dynamic-link: HAS_CPU_FEATURE/HAS_ARCH_FEATURE are easy to misuse
2284   [19765] libc: s390 needs an optimized mempcpy
2285   [19779] glob: glob: buffer overflow with GLOB_ALTDIRFUNC due to incorrect
2286     NAME_MAX limit assumption (CVE-2016-1234)
2287   [19783] build: benchtests don't support --enable-hardcoded-path-in-tests
2288   [19787] network: Missing and incorrect truncation checks in getnameinfo
2289   [19790] math: [ldbl-128ibm] nearbyintl incorrect in non-default rounding
2290     modes
2291   [19791] network: Assertion failure in res_query.c with un-connectable name
2292     server addresses
2293   [19792] libc: MIPS: backtrace yields infinite backtrace with makecontext
2294   [19822] math: libm.so install clobbers old version
2295   [19825] network: resolv: send_vc can return uninitialized data in second
2296     response to getaddrinfo
2297   [19830] network: nss_dns: should check RDATA length against buffer length
2298   [19831] network: nss_dns: getaddrinfo returns uninitialized data when
2299     confronted with A/AAAA records of invalid size
2300   [19837] nss: nss_db: No retries for some long lines with a larger buffer
2301   [19848] math: powl(10,n) for n=-4,-5,-6,-7 is off by more than 1 ULP
2302   [19853] stdio: Printing IBM long double in decimal with high precision is
2303     sometimes incorrect
2304   [19860] build: x86_64: compile errors for tst-audit10 and tst-auditmod10b
2305   [19861] nptl: libpthread IFUNC resolver for fork can lead to crash
2306   [19862] network: resolv, nss_dns: Remove remaining logging of unexpected
2307     record types
2308   [19865] network: Assertion failure or memory leak in
2309     _nss_dns_getcanonname_r
2310   [19868] network: nss_dns: netent code does not skip over non-PTR records
2311   [19879] network: nss_dns: Stack overflow in getnetbyname implementation
2312     (CVE-2016-3075)
2313   [19881] string: Improve x86-64 memset
2314   [19907] string: Incorrect memcpy tests
2315   [19916] dynamic-link: S390: fprs/vrs are not saved/restored while
2316     resolving symbols
2317   [19925] libc: termios.h XCASE namespace
2318   [19928] string: memmove-vec-unaligned-erms.S is slow with large data size
2319   [19929] libc: limits.h NL_NMAX namespace
2320   [19931] stdio: Memory leak in vfprintf
2321   [19957] libc: clone(CLONE_VM) access invalid parent memory
2322   [19963] localedata: en_IL: New locale
2323   [19989] stdio: stdio.h cuserid namespace
2324   [19994] network: getaddrinfo does not restore RES_USE_INET6 flag in
2325     gethosts
2326   [19996] locale: langinfo.h nl_langinfo_l namespace
2327   [20005] stdio: fflush on a file opened with fmemopen resets position to 0
2328   [20010] network: getaddrinfo: Stack overflow in hostent translation
2329     (CVE-2016-3706)
2330   [20012] stdio: libio: fmemopen append mode failure
2331   [20014] stdio: stdio.h namespace for pre-threads POSIX
2332   [20017] network: resolv: Use gmtime_r instead of gmtime in p_secstodate
2333   [20023] libc: fcntl.h timespec namespace
2334   [20024] math: [x86_64] vectorized sincos trashes the stack
2335   [20031] network: nss_hesiod: Heap overflow in get_txt_records
2336   [20041] time: sys/time.h timespec namespace
2337   [20043] libc: unistd.h missing cuserid for UNIX98 and before
2338   [20044] libc: unistd.h missing pthread_atfork for UNIX98
2339   [20051] libc: ttyslot in wrong header under wrong conditions
2340   [20054] libc: gethostname not declared for XPG4
2341   [20055] libc: termios.h missing tcgetsid for XPG4
2342   [20072] dynamic-link: x86 init_cpu_features is called twice in static
2343     executable
2344   [20073] libc: sys/stat.h fchmod namespace
2345   [20074] libc: stdlib.h rand_r namespace
2346   [20076] libc: sys/stat.h missing S_IFSOCK, S_ISSOCK for XPG4
2347   [20094] libc: stdlib.h should not declare grantpt, ptsname, unlockpt for
2348     XPG3
2349   [20111] libc: struct sockaddr_storage cannot be aggregate-copied
2350   [20112] network: sunrpc: stack (frame) overflow in Sun RPC clntudp_call
2351     (CVE-2016-4429)
2352   [20115] string: Extra alignment in memset-vec-unaligned-erms.S
2353   [20119] libc: Wrong mask for processors level type from CPUID
2354   [20139] dynamic-link: Upper part of zmm is zeroed if Glibc is built with
2355     AS not supporting AVX512
2356   [20151] math: [ldbl-128/ldbl-128ibm] j0l, j1l, y0l, y1l return sNaN for
2357     sNaN argument
2358   [20153] math: [ldbl-128ibm] sqrtl (sNaN) returns sNaN
2359   [20156] math: [ldbl-128ibm] ceill, rintl etc. return sNaN for sNaN
2360     argument
2361   [20157] math: [powerpc] fabsl (sNaN) wrongly raises "invalid"
2362   [20160] math: [powerpc] ceil, rint etc. return sNaN for sNaN input
2363   [20178] libc: posix_spawn{p} should not call exit
2364   [20191] stdio: libio: vtables hardening
2365   [20195] string: FMA4 detection requires CPUID execution with register
2366     eax=0x80000001
2367   [20198] libc: quick_exit incorrectly destroys C++11 thread objects.
2368   [20205] math: [i386/x86_64] nextafterl incorrect incrementing negative
2369     subnormals
2370   [20212] math: acos (sNaN) returns sNaN
2371   [20213] math: asin (sNaN) returns sNaN
2372   [20214] network: Linux header sync with linux/in6.h and ipv6.h again.
2373   [20218] math: [i386] asinhl (sNaN) returns sNaN
2374   [20219] math: [i386] atanhl (sNaN) returns sNaN
2375   [20222] stdio: fopencookie: Mangle function pointers
2376   [20224] math: [i386] cbrtl (sNaN) returns sNaN
2377   [20225] math: ldexp, scalbn, scalbln return sNaN for sNaN input
2378   [20226] math: [i386/x86_64] expl, exp10l, expm1l return sNaN for sNaN
2379     input
2380   [20227] math: [i386/x86_64] logl (sNaN) returns sNaN
2381   [20228] math: [i386/x86_64] log10l (sNaN) returns sNaN
2382   [20229] math: [i386/x86_64] log1pl (sNaN) returns sNaN
2383   [20232] math: [ldbl-128] expm1l (sNaN) returns sNaN
2384   [20233] math: [ldbl-128ibm] expm1l (sNaN) returns sNaN
2385   [20234] math: [ldbl-128ibm] log1pl (sNaN) returns sNaN
2386   [20235] math: [i386/x86_64] log2l (sNaN) returns sNaN
2387   [20237] nss: nss_db: get*ent segfaults without preceding set*ent
2388   [20240] math: modf (sNaN) returns sNaN
2389   [20248] libc: debug/tst-longjump_chk2 calls printf from a signal handler
2390   [20250] math: frexp (sNaN) returns sNaN
2391   [20252] math: atan2 (sNaN, qNaN) fails to raise "invalid"
2392   [20255] math: [i386] fdim, fdimf return with excess range and precision /
2393     double rounding
2394   [20256] math: [i386/x86_64] fdiml returns sNaN for sNaN input
2395   [20260] string: ../sysdeps/x86/bits/string.h:1092:3: error: array
2396     subscript is below array bounds [-Werror=array-bounds]
2397   [20262] nis: _nss_nis_initgroups_dyn always returns NSS_STATUS_NOTFOUND
2398   [20263] nptl: robust mutex deadlocks if other thread requests timedlock
2399     (Only arm/linux)
2400   [20277] libc: $dp is not initialized correctly in sysdeps/hppa/start.S
2401   [20284] malloc: malloc: Corrupt arena avoidance causes unnecessary mmap
2402     fallbacks
2403   [20296] math: [i386/x86_64] scalbl returns sNaN for sNaN input, missing
2404     "invalid" exceptions
2405   [20314] nptl: make[4]: *** [/usr/include/stdlib.h] Error 1
2406   [20316] localedata: id_ID: Februari instead of Pebruari
2407   [20327] string: POWER8 strcasecmp returns incorrect result
2408   [20347] math: Failure: Test: j0_downward (0xap+0)
2409   [20348] libc: FAIL: misc/tst-preadvwritev64
2410   [20349] libc: 64-bit value is passed differently in p{readv,writev}{64}
2411   [20350] libc: There is no test for p{read,write}64
2412   [20357] math: Incorrect cos result for 1.5174239687223976
2413   [20384] build: Don't run libmvec-sincos-avx* tests on non avx machines
2414 \f
2415 Version 2.23
2416
2417 * Unicode 8.0.0 Support: Character encoding, character type info, and
2418   transliteration tables are all updated to Unicode 8.0.0, using new
2419   and/or improved generator scripts contributed by Mike FABIAN (Red Hat).
2420   These updates cause user visible changes, such as the fixes for bugs
2421   89, 16061, and 18568.
2422
2423 * sched_setaffinity, pthread_setaffinity_np no longer attempt to guess the
2424   kernel-internal CPU set size.  This means that requests that change the
2425   CPU affinity which failed before (for example, an all-ones CPU mask) will
2426   now succeed.  Applications that need to determine the effective CPU
2427   affinities need to call sched_getaffinity or pthread_getaffinity_np after
2428   setting it because the kernel can adjust it (and the previous size check
2429   would not detect this in the majority of cases).
2430
2431 * The fts.h header can now be used with -D_FILE_OFFSET_BITS=64.  With LFS
2432   the following new symbols are used: fts64_children, fts64_close,
2433   fts64_open, fts64_read and fts64_set.
2434
2435 * getaddrinfo now detects certain invalid responses on an internal netlink
2436   socket.  If such responses are received, an affected process will
2437   terminate with an error message of "Unexpected error <number> on netlink
2438   descriptor <number>" or "Unexpected netlink response of size <number> on
2439   descriptor <number>".  The most likely cause for these errors is a
2440   multi-threaded application which erroneously closes and reuses the netlink
2441   file descriptor while it is used by getaddrinfo.
2442
2443 * A defect in the malloc implementation, present since glibc 2.15 (2012) or
2444   glibc 2.10 via --enable-experimental-malloc (2009), could result in the
2445   unnecessary serialization of memory allocation requests across threads.
2446   The defect is now corrected.  Users should see a substantial increase in
2447   the concurent throughput of allocation requests for applications which
2448   trigger this bug.  Affected applications typically create and
2449   destroy threads frequently.  (Bug 19048 was reported and analyzed by
2450   Ericsson.)
2451
2452 * There is now a --disable-timezone-tools configure option for disabling the
2453   building and installing of the timezone related utilities (zic, zdump, and
2454   tzselect).  This is useful for people who build the timezone data and code
2455   independent of the GNU C Library.
2456
2457 * The obsolete header <regexp.h> has been removed.  Programs that require
2458   this header must be updated to use <regex.h> instead.
2459
2460 * The obsolete functions bdflush, create_module, get_kernel_syms,
2461   query_module and uselib are no longer available to newly linked binaries;
2462   the header <sys/kdaemon.h> has been removed.  These functions and header
2463   were specific to systems using the Linux kernel and could not usefully be
2464   used with the GNU C Library on systems with version 2.6 or later of the
2465   Linux kernel.
2466
2467 * Optimized string, wcsmbs and memory functions for IBM z13.
2468   Implemented by Stefan Liebler.
2469
2470 * Newly linked programs that define a variable called signgam will no longer
2471   have it set by the lgamma, lgammaf and lgammal functions.  Programs that
2472   require signgam to be set by those functions must ensure that they use the
2473   variable provided by the GNU C Library and declared in <math.h>, without
2474   defining their own copy.
2475
2476 * The minimum GCC version that can be used to build this version of the GNU
2477   C Library is GCC 4.7.  Older GCC versions, and non-GNU compilers, can
2478   still be used to compile programs using the GNU C Library.
2479
2480 Security related changes:
2481
2482 * An out-of-bounds value in a broken-out struct tm argument to strftime no
2483   longer causes a crash.  Reported by Adam Nielsen.  (CVE-2015-8776)
2484
2485 * The LD_POINTER_GUARD environment variable can no longer be used to disable
2486   the pointer guard feature.  It is always enabled.  Previously,
2487   LD_POINTER_GUARD could be used to disable security hardening in binaries
2488   running in privileged AT_SECURE mode.  Reported by Hector Marco-Gisbert.
2489   (CVE-2015-8777)
2490
2491 * An integer overflow in hcreate and hcreate_r could lead to an
2492   out-of-bounds memory access.  Reported by Szabolcs Nagy.  (CVE-2015-8778)
2493
2494 * The catopen function no longer has unbounded stack usage.  Reported by
2495   Max.  (CVE-2015-8779)
2496
2497 * The nan, nanf and nanl functions no longer have unbounded stack usage
2498   depending on the length of the string passed as an argument to the
2499   functions.  Reported by Joseph Myers.  (CVE-2014-9761)
2500
2501 * A stack-based buffer overflow was found in libresolv when invoked from
2502   libnss_dns, allowing specially crafted DNS responses to seize control
2503   of execution flow in the DNS client.  The buffer overflow occurs in
2504   the functions send_dg (send datagram) and send_vc (send TCP) for the
2505   NSS module libnss_dns.so.2 when calling getaddrinfo with AF_UNSPEC
2506   family.  The use of AF_UNSPEC triggers the low-level resolver code to
2507   send out two parallel queries for A and AAAA.  A mismanagement of the
2508   buffers used for those queries could result in the response of a query
2509   writing beyond the alloca allocated buffer created by
2510   _nss_dns_gethostbyname4_r.  Buffer management is simplified to remove
2511   the overflow.  Thanks to the Google Security Team and Red Hat for
2512   reporting the security impact of this issue, and Robert Holiday of
2513   Ciena for reporting the related bug 18665. (CVE-2015-7547)
2514
2515 The following bugs are resolved with this release:
2516
2517   [89] localedata: Locales nb_NO and nn_NO should transliterate æøå
2518   [887] math: Math library function "logb" and "nextafter" inconsistent
2519   [2542] math: Incorrect return from float gamma (-0X1.FA471547C2FE5P+1)
2520   [2543] math: Incorrect return from float gamma (-0X1.9260DCP+1)
2521   [2558] math: Incorrect return from double gamma (-0X1.FA471547C2FE5P+1)
2522   [2898] libc: [improve]  warning: the use  of `mktemp' is dangerous, better
2523     use `mkstemp'
2524   [4404] localedata: German translation of "Alarm clock" is misleading
2525   [6799] math: nextafter() and nexttoward() doen't set errno on
2526     overflow/underflow errors
2527   [6803] math: scalb(), scalbln(), scalbn() do not set errno on
2528     overflow/underflow
2529   [10432] nis: _nss_nis_setnetgrent assertion failure
2530   [11460] libc: fts has no LFS support
2531   [12926] network: getaddrinfo()/make_request() may spin forever
2532   [13065] nptl: Race condition in pthread barriers
2533   [13690] nptl: pthread_mutex_unlock potentially cause invalid access
2534   [14341] dynamic-link: Dynamic linker crash when DT_JMPREL and DT_REL{,A}
2535     are not contiguous
2536   [14551] math: [ldbl-128ibm] strtold overflow handling for IBM long double
2537   [14912] libc: Rename non-installed bits/*.h headers
2538   [15002] libc: Avoid undefined behavior in posix_fallocate overflow check
2539   [15367] math: Let gcc use __builtin_isinf
2540   [15384] math: One constant fewer in ieee754/dbl-64/wordsize-64/s_finite.c
2541   [15421] math: lgamma wrongly sets signgam for ISO C
2542   [15470] math: [arm] On ARM llrintl() and llroundl() do not raise
2543     FE_INVALID with argument out of range
2544   [15491] math: [i386/x86_64] x86 nearbyint implementations wrongly clear
2545     all exceptions
2546   [15786] dynamic-link: ifunc resolver functions can smash function
2547     arguments
2548   [15918] math: Unnecessary check for equality in hypotf()
2549   [16061] localedata: Review / update transliteration data
2550   [16068] math: [i386/x86_64] x86 and x86_64 fesetenv exclude state they
2551     should include
2552   [16141] time: strptime %z offset restriction
2553   [16171] math: drem should be alias of remainder
2554   [16296] math: fegetround is pure?
2555   [16347] math: [ldbl-128ibm] ldbl-128/e_lgammal_r.c may not be suitable.
2556   [16364] libc: sleep may leave SIGCHLD blocked on sync cancellation on
2557     GNU/Linux
2558   [16399] math: [mips] lrint / llrint / lround / llround missing exceptions
2559   [16415] math: Clean up ldbl-128 / ldbl-128ibm expm1l for large positive
2560     arguments
2561   [16422] math: [powerpc] math-float, math-double failing llrint tests with
2562     "Exception "Inexact" set" on ppc32
2563   [16495] localedata: nl_NL: date_fmt: shuffle year/month around
2564   [16517] math: Missing underflow exception from tanf/tan/tanl
2565   [16519] math: Missing underflow exception from sinhf
2566   [16520] math: Missing underflow exception from tanhf
2567   [16521] math: Missing underflow exception from exp2
2568   [16620] math: [ldbl-128ibm] exp10l spurious overflows / bad directed
2569     rounding results
2570   [16734] stdio: fopen calls mmap to allocate its buffer
2571   [16961] math: nan function incorrect handling of bad sequences
2572   [16962] math: nan function unbounded stack allocation (CVE-2014-9761)
2573   [16973] localedata: Fix lang_lib/lang_term as per ISO 639-2
2574   [16985] locale: localedef: confusing error message when opening output
2575     fails
2576   [17118] math: ctanh(INFINITY + 2 * I) returns incorrect value
2577   [17197] locale: Redundant shift character in iconv conversion output at
2578     block boundary
2579   [17243] libc: trunk/posix/execl.c:53: va_args problem ?
2580   [17244] libc: trunk/sysdeps/unix/sysv/linux/semctl.c:116: va_args muxup ?
2581   [17250] dynamic-link: static linking breaks nss loading
2582     (getaddrinfo/getpwnam/etc...)
2583   [17404] libc: atomic_exchange_rel lacking a barrier on MIPS16, GCC before
2584     4.7?
2585   [17441] math: isnan() should use __builtin_isnan() in GCC
2586   [17514] nptl: Assert failure unlocking ERRORCHECK mutex after timedlock
2587     (related to lock elision)
2588   [17787] manual: Exponent on page 324 of the PDF ends prematurely
2589   [17886] time: strptime should be able to parse "Z" as a timezone with %z
2590   [17887] time: strptime should be able to parse "+01:00" style timezones
2591   [17905] libc: catopen() Multiple unbounded stack allocations
2592     (CVE-2015-8779)
2593   [18084] libc: backtrace (..., 0) dumps core on x86
2594   [18086] libc: nice() sets errno to 0 on success
2595   [18240] libc: hcreate, hcreate_r should fail with ENOMEM if element count
2596     is too large (CVE-2015-8778)
2597   [18251] dynamic-link: SONAME missing when audit modules provides path
2598   [18265] libc: add attributes for wchar string and memory functions
2599   [18370] math: csqrt missing underflows
2600   [18421] libc: [hppa] read-only segment has dynamic relocations
2601   [18472] libc: Obsolete syscall wrappers should be compat symbols
2602   [18480] libc: hppa glibc miscompilation in sched_setaffinity()
2603   [18491] localedata: Update tr_TR LC_CTYPE as part of Unicode updates
2604   [18525] localedata: Remove locale timezone information
2605   [18560] libc: [powerpc] spurious bits/ipc.h definitions
2606   [18568] localedata: Update locale data to Unicode 8.0
2607   [18589] locale: sort-test.sh fails at random
2608   [18595] math: ctan, ctanh missing underflows
2609   [18604] libc: assert macro-expands its argument
2610   [18610] math: S390: fetestexcept() reports any exception if DXC-code
2611     contains a vector instruction exception.
2612   [18611] math: j1, jn missing errno setting on underflow
2613   [18618] localedata: sync Chechen locale definitions with other *_RU
2614     locales
2615   [18647] math: powf(-0x1.000002p0, 0x1p30) returns 0 instead of +inf
2616   [18661] libc: Some x86-64 assembly codes don't align stack to 16 bytes
2617   [18665] network: In send_dg, the recvfrom function is NOT always using the
2618     buffer size of a newly created buffer (CVE-2015-7547)
2619   [18674] libc: [i386] trunk/sysdeps/i386/tst-auditmod3b.c:84: possible
2620     missing break ?
2621   [18675] libc: fpathconf(_PC_NAME_MAX) fails against large filesystems for
2622     32bit processes
2623   [18681] libc: regexp.h is obsolete and buggy, and should be desupported
2624   [18699] math: tilegx cproj() for various complex infinities does not yield
2625     infinity
2626   [18724] libc: Harden put*ent functions against data injection
2627   [18743] nptl: PowerPC: findutils testcase fails with --enable-lock-elision
2628   [18755] build: build errors with -DNDEBUG
2629   [18757] stdio: fmemopen fails to set errno on failure
2630   [18778] dynamic-link: ld.so crashes if failed dlopen causes libpthread to
2631     be forced unloaded
2632   [18781] libc: openat64 lacks O_LARGEFILE
2633   [18787] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/atomic.h:71:6:
2634     error: can’t find a register in class ‘R1_REGS’ while reloading ‘asm’
2635   [18789] math: [ldbl-128ibm] sinhl inaccurate near 0
2636   [18790] math: [ldbl-128ibm] tanhl inaccurate
2637   [18795] libc: stpncpy fortification misses buffer lengths that are
2638     statically too large
2639   [18796] build: build fails for --disable-mathvec
2640   [18803] math: hypot missing underflows
2641   [18820] stdio: fmemopen may leak memory on failure
2642   [18823] math: csqrt spurious underflows
2643   [18824] math: fma spurious underflows
2644   [18825] math: pow missing underflows
2645   [18857] math: [ldbl-128ibm] nearbyintl wrongly uses signaling comparisons
2646   [18868] nptl: pthread_barrier_init typo has in-theory-undefined behavior
2647   [18870] build: sem_open.c fails to compile with missing symbol
2648     FUTEX_SHARED
2649   [18872] stdio: Fix memory leak in printf_positional
2650   [18873] libc: posix_fallocate overflow check ineffective
2651   [18875] math: Excess precision leads incorrect libm
2652   [18877] libc: arm: mmap offset regression
2653   [18887] libc: memory corruption when using getmntent on blank lines
2654   [18918] localedata: hu_HU: change time to HH:MM:SS format
2655   [18921] libc: Regression: extraneous stat() and fstat() performed by
2656     opendir()
2657   [18928] dynamic-link: LD_POINTER_GUARD is not ignored for privileged
2658     binaries (CVE-2015-8777)
2659   [18951] math: tgamma missing underflows
2660   [18952] math: [ldbl-128/ldbl-128ibm] lgammal spurious "invalid", incorrect
2661     signgam
2662   [18953] localedata: lt_LT: change currency symbol to the euro
2663   [18956] math: powf inaccuracy
2664   [18961] math: [i386] exp missing underflows
2665   [18966] math: [i386] exp10 missing underflows
2666   [18967] math: math.h XSI POSIX namespace (gamma, isnan, scalb)
2667   [18969] build: multiple string test failures due to missing locale
2668     dependencies
2669   [18970] libc: Reference of pthread_setcancelstate in libc.a
2670   [18977] math: float / long double Bessel functions not in XSI POSIX
2671   [18980] math: i386 libm functions return with excess range and precision
2672   [18981] math: i386 scalb*, ldexp return with excess range and precision
2673   [18982] stdio: va_list and vprintf
2674   [18985] time: Passing out of range data to strftime() causes a segfault
2675     (CVE-2015-8776)
2676   [19003] math: [x86_64] fma4 version of pow inappropriate contraction
2677   [19007] libc: FAIL: elf/check-localplt with -z now and binutils 2.26
2678   [19012] locale: iconv_open leaks memory on error path
2679   [19016] math: clog, clog10 inaccuracy
2680   [19018] nptl: Mangle function pointers in tls_dtor_list
2681   [19032] math: [i386] acosh (-qNaN) spurious "invalid" exception
2682   [19046] math: ldbl-128 / ldbl-128ibm lgamma bad overflow handling
2683   [19048] malloc: malloc: arena free list can become cyclic, increasing
2684     contention
2685   [19049] math: [powerpc] erfc incorrect zero sign
2686   [19050] math: [powerpc] log* incorrect zero sign
2687   [19058] math: [x86_64] Link fail with -fopenmp and -flto
2688   [19059] math: nexttoward overflow incorrect in non-default rounding modes
2689   [19071] math: ldbl-96 lroundl incorrect just below powers of 2
2690   [19074] network: Data race in _res_hconf_reorder_addrs
2691   [19076] math: [ldbl-128ibm] log1pl (-1) wrong sign of infinity
2692   [19077] math: [ldbl-128ibm] logl (1) incorrect sign of zero result
2693   [19078] math: [ldbl-128ibm] expl overflow incorrect in non-default
2694     rounding modes
2695   [19079] math: dbl-64/wordsize-64 lround based on llround incorrect for
2696     ILP32
2697   [19085] math: ldbl-128 lrintl, lroundl missing exceptions for 32-bit long
2698   [19086] manual: posix_fallocate64 documented argument order is wrong.
2699   [19088] math: lround, llround missing exceptions close to overflow
2700     threshold
2701   [19094] math: lrint, llrint missing exceptions close to overflow threshold
2702   [19095] math: dbl-64 lrint incorrect for 64-bit long
2703   [19122] dynamic-link: Unnecessary PLT relocations in librtld.os
2704   [19124] dynamic-link: ld.so failed to build with older assmebler
2705   [19125] math: [powerpc32] llroundf, llround incorrect exceptions
2706   [19129] dynamic-link: [arm] Concurrent lazy TLSDESC resolution can crash
2707   [19134] math: [powerpc32] lround, lroundf spurious exceptions
2708   [19137] libc: i386/epoll_pwait.S doesn't support cancellation
2709   [19143] nptl: Remove CPU set size checking from sched_setaffinity,
2710     pthread_setaffinity_np
2711   [19156] math: [ldbl-128] j0l spurious underflows
2712   [19164] nptl: tst-getcpu fails with many possible CPUs
2713   [19168] math: math/test-ildoubl and math/test-ldouble failure
2714   [19174] nptl: PowerPC: TLE enabled pthread mutex performs poorly.
2715   [19178] dynamic-link: ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA confuses
2716     prelink
2717   [19181] math: [i386/x86_64] fesetenv (FE_DFL_ENV), fesetenv
2718     (FE_NOMASK_ENV) do not clear SSE exceptions
2719   [19182] malloc: malloc deadlock between ptmalloc_lock_all and
2720     _int_new_arena/reused_arena
2721   [19189] math: [ldbl-128] log1pl (-qNaN) spurious "invalid" exception
2722   [19201] math: dbl-64 remainder incorrect sign of zero result
2723   [19205] math: bits/math-finite.h conditions do not match math.h and
2724     bits/mathcalls.h
2725   [19209] math: bits/math-finite.h wrongly maps ldexp to scalbn
2726   [19211] math: lgamma functions do not set signgam for -ffinite-math-only
2727     for C99-based standards
2728   [19212] libc: features.h not -Wundef clean
2729   [19213] math: [i386/x86_64] log* (1) incorrect zero sign for -ffinite-
2730     math-only
2731   [19214] libc: Family and model identification for AMD CPU's are incorrect.
2732   [19219] libc: GLIBC build fails for ia64 with missing __nearbyintl
2733   [19228] math: [powerpc] nearbyint wrongly clears "inexact", leaves traps
2734     disabled
2735   [19235] math: [powerpc64] lround, lroundf, llround, llroundf spurious
2736     "inexact" exceptions
2737   [19238] math: [powerpc] round, roundf spurious "inexact" for integer
2738     arguments
2739   [19242] libc: strtol incorrect in Turkish locales
2740   [19243] malloc: reused_arena can pick an arena on the free list, leading
2741     to an assertion failure and reference count corruption
2742   [19253] time: tzset() ineffective when temporary TZ did not include DST
2743     rules
2744   [19266] math: strtod ("NAN(I)") incorrect in Turkish locales
2745   [19270] math: [hppa] Shared libm missing __isnanl
2746   [19285] libc: [hppa] sysdeps/unix/sysv/linux/hppa/bits/mman.h: missing
2747     MAP_HUGETLB and MAP_STACK defines
2748   [19313] nptl: Wrong __cpu_mask for x32
2749   [19347] libc: grantpt: try to force a specific gid even without pt_chown
2750   [19349] math: [ldbl-128ibm] tanhl inaccurate for small arguments
2751   [19350] math: [ldbl-128ibm] sinhl spurious overflows
2752   [19351] math: [ldbl-128ibm] logl inaccurate near 1
2753   [19363] time: x32: times() return value wrongly truncates/sign extends
2754     from 32bit
2755   [19367] dynamic-link: Improve branch prediction on Silvermont
2756   [19369] network: Default domain name not reset by res_ninit when "search"
2757     / "domain" entry is removed from resolv.conf
2758   [19375] math: powerpc: incorrect results for POWER7 logb with negative
2759     subnormals
2760   [19385] localedata: bg_BG: time separator should be colon, not comma
2761   [19408] libc: linux personality syscall wrapper may erroneously return an
2762     error on 32-bit architectures
2763   [19415] libc: dladdr returns wrong names on hppa
2764   [19432] libc: iconv rejects redundant escape sequences in IBM900, IBM903,
2765     IBM905, IBM907, and IBM909
2766   [19439] math: Unix98 isinf and isnan functions conflict with C++11
2767   [19443] build: build failures with -DDEBUG
2768   [19451] build: Make check fails on test-double-vlen2
2769   [19462] libc: Glibc failed to build with -Os
2770   [19465] math: Wrong code with -Os
2771   [19466] time: time/tst-mktime2.c is compiled into an infinite loop with
2772     -Os
2773   [19467] string: Fast_Unaligned_Load needs to be enabled for Excavator core
2774     CPU's.
2775   [19475] libc: Glibc 2.22 doesn't build on sparc [PATCH]
2776   [19486] math: S390: Math tests fail with "Exception Inexact set".
2777   [19529] libc: [ARM]: FAIL: stdlib/tst-makecontext
2778   [19550] libc: [mips] mmap negative offset handling inconsistent with other
2779     architectures
2780   [19590] math: Fail to build shared objects that use libmvec.so functions.
2781 \f
2782 Version 2.22
2783
2784 * The following bugs are resolved with this release:
2785
2786   438, 2981, 4719, 6544, 6792, 11216, 12836, 13028, 13064, 13151, 13152,
2787   14094, 14113, 14292, 14841, 14906, 14958, 15319, 15467, 15790, 15969,
2788   16159, 16339, 16350, 16351, 16352, 16353, 16361, 16512, 16526, 16538,
2789   16559, 16560, 16704, 16783, 16850, 17053, 17090, 17195, 17269, 17293,
2790   17322, 17403, 17475, 17523, 17542, 17569, 17581, 17588, 17596, 17620,
2791   17621, 17628, 17631, 17692, 17711, 17715, 17776, 17779, 17792, 17833,
2792   17836, 17841, 17912, 17916, 17930, 17932, 17944, 17949, 17964, 17965,
2793   17967, 17969, 17977, 17978, 17987, 17991, 17996, 17998, 17999, 18007,
2794   18019, 18020, 18029, 18030, 18032, 18034, 18036, 18038, 18039, 18042,
2795   18043, 18046, 18047, 18049, 18068, 18078, 18080, 18093, 18100, 18104,
2796   18110, 18111, 18116, 18125, 18128, 18134, 18138, 18185, 18196, 18197,
2797   18206, 18210, 18211, 18217, 18219, 18220, 18221, 18234, 18244, 18245,
2798   18247, 18287, 18319, 18324, 18333, 18346, 18371, 18383, 18397, 18400,
2799   18409, 18410, 18412, 18418, 18422, 18434, 18444, 18457, 18468, 18469,
2800   18470, 18479, 18483, 18495, 18496, 18497, 18498, 18502, 18507, 18508,
2801   18512, 18513, 18519, 18520, 18522, 18527, 18528, 18529, 18530, 18532,
2802   18533, 18534, 18536, 18539, 18540, 18542, 18544, 18545, 18546, 18547,
2803   18549, 18553, 18557, 18558, 18569, 18583, 18585, 18586, 18592, 18593,
2804   18594, 18602, 18612, 18613, 18619, 18633, 18635, 18641, 18643, 18648,
2805   18657, 18676, 18694, 18696, 18887.
2806
2807 * Cache information can be queried via sysconf() function on s390 e.g. with
2808   _SC_LEVEL1_ICACHE_SIZE as argument.
2809
2810 * A buffer overflow in gethostbyname_r and related functions performing DNS
2811   requests has been fixed.  If the NSS functions were called with a
2812   misaligned buffer, the buffer length change due to pointer alignment was
2813   not taken into account.  This could result in application crashes or,
2814   potentially arbitrary code execution, using crafted, but syntactically
2815   valid DNS responses.  (CVE-2015-1781)
2816
2817 * The time zone file parser has been made more robust against crafted time
2818   zone files, avoiding heap buffer overflows related to the processing of
2819   the tzh_ttisstdcnt and tzh_ttisgmtcnt fields, and a stack overflow due to
2820   large time zone data files.  Overly long time zone specifiers in the TZ
2821   variable no longer result in stack overflows and crashes.
2822
2823 * A powerpc and powerpc64 optimization for TLS, similar to TLS descriptors
2824   for LD and GD on x86 and x86-64, has been implemented.  You will need
2825   binutils-2.24 or later to enable this optimization.
2826
2827 * Character encoding and ctype tables were updated to Unicode 7.0.0, using
2828   new generator scripts contributed by Pravin Satpute and Mike FABIAN (Red
2829   Hat).  These updates cause user visible changes, such as the fix for bug
2830   17998.
2831
2832 * CVE-2014-8121 The NSS backends shared internal state between the getXXent
2833   and getXXbyYY NSS calls for the same database, causing a denial-of-service
2834   condition in some applications.
2835
2836 * Added vector math library named libmvec with the following vectorized x86_64
2837   implementations: cos, cosf, sin, sinf, sincos, sincosf, log, logf, exp, expf,
2838   pow, powf.
2839   The library can be disabled with --disable-mathvec. Use of the functions is
2840   enabled with -fopenmp -ffast-math starting from -O1 for GCC version >= 4.9.0.
2841   Shared library libmvec.so is linked in as needed when using -lm (no need to
2842   specify -lmvec explicitly for not static builds).
2843   Visit <https://sourceware.org/glibc/wiki/libmvec> for detailed information.
2844
2845 * A new fmemopen implementation has been added with the goal of POSIX
2846   compliance. The new implementation fixes the following long-standing
2847   issues: BZ#6544, BZ#11216, BZ#12836, BZ#13151, BZ#13152, and BZ#14292. The
2848   old implementation is still present for use be by existing binaries.
2849
2850 * The 32-bit sparc sigaction ABI was inadvertently broken in the 2.20 and 2.21
2851   releases.  It has been fixed to match 2.19 and older, but binaries built
2852   against 2.20 and 2.21 might need to be recompiled.  See BZ#18694.
2853
2854 * Port to Native Client running on ARMv7-A (--host=arm-nacl).
2855   Contributed by Roland McGrath (Google).
2856
2857 * The header <regexp.h> is deprecated, and will be removed in a future
2858   release.  Use of this header will trigger a deprecation warning.
2859   Application developers should update their code to use <regex.h> instead.
2860
2861   This header was formerly part of SUS, but was deprecated in 1994 and
2862   removed from the standard in 2001.  Also, the glibc implementation
2863   leaks memory.  See BZ#18681 for more details.
2864 \f
2865 Version 2.21
2866
2867 * The following bugs are resolved with this release:
2868
2869   6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
2870   15215, 15378, 15884, 16009, 16418, 16191, 16469, 16576, 16617, 16618,
2871   16619, 16657, 16740, 16857, 17192, 17266, 17273, 17344, 17363, 17370,
2872   17371, 17411, 17460, 17475, 17485, 17501, 17506, 17508, 17522, 17555,
2873   17570, 17571, 17572, 17573, 17574, 17582, 17583, 17584, 17585, 17589,
2874   17594, 17601, 17608, 17616, 17625, 17630, 17633, 17634, 17635, 17647,
2875   17653, 17657, 17658, 17664, 17665, 17668, 17682, 17702, 17717, 17719,
2876   17722, 17723, 17724, 17725, 17732, 17733, 17744, 17745, 17746, 17747,
2877   17748, 17775, 17777, 17780, 17781, 17782, 17791, 17793, 17796, 17797,
2878   17801, 17803, 17806, 17834, 17844, 17848, 17868, 17869, 17870, 17885,
2879   17892.
2880
2881 * CVE-2015-1472 CVE-2015-1473 Under certain conditions wscanf can allocate
2882   too little memory for the to-be-scanned arguments and overflow the
2883   allocated buffer.  The implementation now correctly computes the required
2884   buffer size when using malloc, and switches to malloc from alloca as
2885   intended.
2886
2887 * A new semaphore algorithm has been implemented in generic C code for all
2888   machines. Previous custom assembly implementations of semaphore were
2889   difficult to reason about or ensure that they were safe. The new version
2890   of semaphore supports machines with 64-bit or 32-bit atomic operations.
2891   The new semaphore algorithm is used by sem_init, sem_open, sem_post,
2892   sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
2893
2894 * Port to Altera Nios II has been contributed by Mentor Graphics.
2895
2896 * Optimized strcpy, stpcpy, strncpy, stpncpy, strcmp, and strncmp
2897   implementations for powerpc64/powerpc64le.
2898   Implemented by Adhemerval Zanella (IBM).
2899
2900 * Added support for TSX lock elision of pthread mutexes on powerpc32, powerpc64
2901   and powerpc64le.  This may improve lock scaling of existing programs on
2902   HTM capable systems.  The lock elision code is only enabled with
2903   --enable-lock-elision=yes.  Also, the TSX lock elision implementation for
2904   powerpc will issue a transaction abort on every syscall to avoid side
2905   effects being visible outside transactions.
2906
2907 * Optimized strcpy, stpcpy, strchrnul and strrchr implementations for
2908   AArch64.  Contributed by ARM Ltd.
2909
2910 * i386 memcpy functions optimized with SSE2 unaligned load/store.
2911
2912 * CVE-2104-7817 The wordexp function could ignore the WRDE_NOCMD flag
2913   under certain input conditions resulting in the execution of a shell for
2914   command substitution when the application did not request it. The
2915   implementation now checks WRDE_NOCMD immediately before executing the
2916   shell and returns the error WRDE_CMDSUB as expected.
2917
2918 * CVE-2012-3406 printf-style functions could run into a stack overflow when
2919   processing format strings with a large number of format specifiers.
2920
2921 * CVE-2014-9402 The nss_dns implementation of getnetbyname could run into an
2922   infinite loop if the DNS response contained a PTR record of an unexpected
2923   format.
2924
2925 * The minimum GCC version that can be used to build this version of the GNU
2926   C Library is GCC 4.6.  Older GCC versions, and non-GNU compilers, can
2927   still be used to compile programs using the GNU C Library.
2928
2929 * The GNU C Library is now built with -Werror by default.  This can be
2930   disabled by configuring with --disable-werror.
2931
2932 * New locales: tu_IN, bh_IN, raj_IN, ce_RU.
2933
2934 * The obsolete sigvec function has been removed.  This was the original
2935   4.2BSD interface that inspired the POSIX.1 sigaction interface, which
2936   programs have been using instead for about 25 years.  Of course, ABI
2937   compatibility for old binaries using sigvec remains intact.
2938
2939 * Merged gettext 0.19.3 into the intl subdirectory.  This fixes building
2940   with newer versions of bison.
2941
2942 * Support for MIPS o32 FPXX, FP64A and FP64 ABI Extensions.
2943   The original MIPS o32 hard-float ABI requires an FPU where double-precision
2944   registers overlay two consecutive single-precision registers.  MIPS32R2
2945   introduced a new FPU mode (FR=1) where double-precision registers extend the
2946   corresponding single-precision registers which is incompatible with the
2947   o32 hard-float ABI.  The MIPS SIMD ASE and the MIPSR6 architecture both
2948   require the use of FR=1 making a transition necessary.  New o32 ABI
2949   extensions enable users to migrate over time from the original o32 ABI
2950   through to the updated o32 FP64 ABI.  To achieve this the dynamic linker now
2951   tracks the ABI of any loaded object and verifies that new objects are
2952   compatible.  Mode transitions will also be requested as required and
2953   unsupportable objects will be rejected.  The ABI checks include both soft and
2954   hard float ABIs for o32, n32 and n64.
2955
2956   GCC 5 with GNU binutils 2.25 onwards:
2957   It is strongly recommended that all o32 system libraries are built using the
2958   new o32 FPXX ABI (-mfpxx) to facilitate the transition as this is compatible
2959   with the original and all new o32 ABI extensions.  Configure a MIPS GCC
2960   compiler using --with-fp-32=xx to set this by default.
2961 \f
2962 Version 2.20
2963
2964 * The following bugs are resolved with this release:
2965
2966   6804, 9894, 11505, 12994, 13347, 13651, 14308, 14770, 15119, 15132, 15347,
2967   15514, 15698, 15804, 15894, 15946, 16002, 16064, 16095, 16194, 16198,
2968   16275, 16284, 16287, 16315, 16348, 16349, 16354, 16357, 16362, 16447,
2969   16516, 16532, 16539, 16545, 16561, 16562, 16564, 16574, 16599, 16600,
2970   16609, 16610, 16611, 16613, 16619, 16623, 16629, 16632, 16634, 16639,
2971   16642, 16648, 16649, 16670, 16674, 16677, 16680, 16681, 16683, 16689,
2972   16695, 16701, 16706, 16707, 16712, 16713, 16714, 16724, 16731, 16739,
2973   16740, 16743, 16754, 16758, 16759, 16760, 16770, 16786, 16789, 16791,
2974   16796, 16799, 16800, 16815, 16823, 16824, 16831, 16838, 16839, 16849,
2975   16854, 16876, 16877, 16878, 16882, 16885, 16888, 16890, 16892, 16912,
2976   16915, 16916, 16917, 16918, 16922, 16927, 16928, 16932, 16943, 16958,
2977   16965, 16966, 16967, 16977, 16978, 16984, 16990, 16996, 17009, 17022,
2978   17031, 17042, 17048, 17050, 17058, 17061, 17062, 17069, 17075, 17078,
2979   17079, 17084, 17086, 17088, 17092, 17097, 17125, 17135, 17137, 17150,
2980   17153, 17187, 17213, 17259, 17261, 17262, 17263, 17319, 17325, 17354.
2981
2982 * Reverted change of ABI data structures for s390 and s390x:
2983   On s390 and s390x the size of struct ucontext and jmp_buf was increased in
2984   2.19. This change is reverted in 2.20. The introduced 2.19 symbol versions
2985   of getcontext, setjmp, _setjmp, __sigsetjmp, longjmp, _longjmp, siglongjmp
2986   are preserved pointing straight to the same implementation as the old ones.
2987   Given that, new callers will simply provide a too-big buffer to these
2988   functions. Any applications/libraries out there that embed jmp_buf or
2989   ucontext_t in an ABI-relevant data structure that have already been rebuilt
2990   against 2.19 headers will have to rebuilt again. This is necessary in any
2991   case to revert the breakage in their ABI caused by the glibc change.
2992
2993 * Support for file description locks is added to systems running the
2994   Linux kernel. The standard file locking interfaces are extended to
2995   operate on file descriptions, not file descriptors, via the use of
2996   F_OFD_GETLK, F_OFD_SETLK, and F_OFD_SETLKW. File description locks
2997   are associated with an open file instead of a process.
2998
2999 * Optimized strchr implementation for AArch64.  Contributed by ARM Ltd.
3000
3001 * The minimum Linux kernel version that this version of the GNU C Library
3002   can be used with is 2.6.32.
3003
3004 * Running the testsuite no longer terminates as soon as a test fails.
3005   Instead, a file tests.sum (xtests.sum from "make xcheck") is generated,
3006   with PASS or FAIL lines for individual tests.  A summary of the results is
3007   printed, including a list of failing lists, and "make check" exits with
3008   error status if there were any unexpected failures.  "make check
3009   stop-on-test-failure=y" may be used to keep the old behavior.
3010
3011 * The am33 port, which had not worked for several years, has been removed
3012   from ports.
3013
3014 * The _BSD_SOURCE and _SVID_SOURCE feature test macros are no longer
3015   supported; they now act the same as _DEFAULT_SOURCE (but generate a
3016   warning).  Except for cases where _BSD_SOURCE enabled BSD interfaces that
3017   conflicted with POSIX (support for which was removed in 2.19), the
3018   interfaces those macros enabled remain available when compiling with
3019   _GNU_SOURCE defined, with _DEFAULT_SOURCE defined, or without any feature
3020   test macros defined.
3021
3022 * Optimized strcmp implementation for ARMv7.  Contributed by ARM Ltd.
3023
3024 * Added support for TX lock elision of pthread mutexes on s390 and s390x.
3025   This may improve lock scaling of existing programs on TX capable systems.
3026   The lock elision code is only built with --enable-lock-elision=yes and
3027   then requires a GCC version supporting the TX builtins.  With lock elision
3028   default mutexes are elided via __builtin_tbegin, if the cpu supports
3029   transactions. By default lock elision is not enabled and the elision code
3030   is not built.
3031
3032 * CVE-2014-4043 The posix_spawn_file_actions_addopen implementation did not
3033   copy the path argument.  This allowed programs to cause posix_spawn to
3034   deference a dangling pointer, or use an unexpected pathname argument if
3035   the string was modified after the posix_spawn_file_actions_addopen
3036   invocation.
3037
3038 * All supported architectures now use the main glibc sysdeps directory
3039   instead of some being in a separate "ports" directory (which was
3040   distributed separately before glibc 2.17).
3041
3042 * The NPTL implementation of POSIX pthreads is no longer an "add-on".
3043   On configurations that support it (all Linux configurations), it's now
3044   used regardless of the --enable-add-ons switch to configure.  It is no
3045   longer possible to build such configurations without pthreads support.
3046
3047 * Locale names, including those obtained from environment variables (LANG
3048   and the LC_* variables), are more tightly checked for proper syntax.
3049   setlocale will now fail (with EINVAL) for locale names that are overly
3050   long, contain slashes without starting with a slash, or contain ".." path
3051   components. (CVE-2014-0475)  Previously, some valid locale names were
3052   silently replaced with the "C" locale when running in AT_SECURE mode
3053   (e.g., in a SUID program).  This is no longer necessary because of the
3054   additional checks.
3055
3056 * On x86-64, the dynamic linker's lazy-binding support is now compatible
3057   with application code using Intel MPX instructions.  (With all previous
3058   versions, the MPX register state could be clobbered when making calls
3059   into or out of a shared library.)  Note that while the new dynamic
3060   linker is compatible with all known x86 hardware whether or not it
3061   supports Intel MPX, some x86 instruction-set emulators might fail to
3062   handle the new instruction encodings.  This is known to affect Valgrind
3063   versions up through 3.9 (but will be fixed in the forthcoming 3.10
3064   release), and might affect other tools that do instruction emulation.
3065
3066 * Support for loadable gconv transliteration modules has been removed.
3067   The support for transliteration modules has been non-functional for
3068   over a decade, and the removal is prompted by security defects.  The
3069   normal gconv conversion modules are still supported.  Transliteration
3070   with //TRANSLIT is still possible, and the //IGNORE specifier
3071   continues to be  supported. (CVE-2014-5119)
3072
3073 * Decoding a crafted input sequence in the character sets IBM933, IBM935,
3074   IBM937, IBM939, IBM1364 could result in an out-of-bounds array read,
3075   resulting a denial-of-service security vulnerability in applications which
3076   use functions related to iconv. (CVE-2014-6040)
3077 \f
3078 Version 2.19
3079
3080 * The following bugs are resolved with this release:
3081
3082   156, 387, 431, 762, 832, 926, 2801, 4772, 6786, 6787, 6807, 6810, 6981,
3083   7003, 9721, 9954, 10253, 10278, 11087, 11157, 11214, 12100, 12486, 12751,
3084   12986, 13028, 13982, 13985, 14029, 14032, 14120, 14143, 14155, 14286,
3085   14547, 14699, 14752, 14782, 14876, 14910, 15004, 15048, 15073, 15089,
3086   15128, 15218, 15268, 15277, 15308, 15362, 15374, 15400, 15425, 15427,
3087   15483, 15522, 15531, 15532, 15593, 15601, 15608, 15609, 15610, 15632,
3088   15640, 15670, 15672, 15680, 15681, 15723, 15734, 15735, 15736, 15748,
3089   15749, 15754, 15760, 15763, 15764, 15797, 15799, 15825, 15843, 15844,
3090   15846, 15847, 15849, 15850, 15855, 15856, 15857, 15859, 15867, 15886,
3091   15887, 15890, 15892, 15893, 15895, 15897, 15901, 15905, 15909, 15915,
3092   15917, 15919, 15921, 15923, 15939, 15941, 15948, 15963, 15966, 15968,
3093   15985, 15988, 15997, 16032, 16034, 16036, 16037, 16038, 16041, 16046,
3094   16055, 16071, 16072, 16074, 16077, 16078, 16103, 16112, 16143, 16144,
3095   16146, 16150, 16151, 16153, 16167, 16169, 16172, 16195, 16214, 16245,
3096   16271, 16274, 16283, 16289, 16293, 16314, 16316, 16330, 16337, 16338,
3097   16356, 16365, 16366, 16369, 16372, 16375, 16379, 16381, 16384, 16385,
3098   16386, 16387, 16390, 16394, 16398, 16400, 16407, 16408, 16414, 16430,
3099   16431, 16453, 16474, 16506, 16510, 16529
3100
3101 * Slovenian translations for glibc messages have been contributed by the
3102   Translation Project's Slovenian team of translators.
3103
3104 * The public headers no longer use __unused nor __block.  This change is to
3105   support compiling programs that are derived from BSD sources and use
3106   __unused internally, and to support compiling with Clang's -fblock
3107   extension which uses __block.
3108
3109 * CVE-2012-4412 The strcoll implementation caches indices and rules for
3110   large collation sequences to optimize multiple passes.  This cache
3111   computation may overflow for large collation sequences and may cause a
3112   stack or buffer overflow.  This is now fixed to use a slower algorithm
3113   which does not use a cache if there is an integer overflow.
3114
3115 * CVE-2012-4424 The strcoll implementation uses malloc to cache indices and
3116   rules for large collation sequences to optimize multiple passes and falls
3117   back to alloca if malloc fails, resulting in a possible stack overflow.
3118   The implementation now falls back to an uncached collation sequence lookup
3119   if malloc fails.
3120
3121 * CVE-2013-4788 The pointer guard used for pointer mangling was not
3122   initialized for static applications resulting in the security feature
3123   being disabled. The pointer guard is now correctly initialized to a
3124   random value for static applications. Existing static applications need
3125   to be recompiled to take advantage of the fix (bug 15754).
3126
3127 * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes
3128   to the d_name member of struct dirent, or omit the terminating NUL
3129   character.  (Bugzilla #14699).
3130
3131 * CVE-2013-4332 The pvalloc, valloc, memalign, posix_memalign and
3132   aligned_alloc functions could allocate too few bytes or corrupt the
3133   heap when passed very large allocation size values (Bugzilla #15855,
3134   #15856, #15857).
3135
3136 * CVE-2013-4458 Stack overflow in getaddrinfo with large number of results
3137   for AF_INET6 has been fixed (Bugzilla #16072).
3138
3139 * New locales: ak_GH, anp_IN, ar_SS, cmn_TW, hak_TW, lzh_TW, nan_TW, pap_AW,
3140   pap_CW, quz_PE, the_NP.
3141
3142 * Substantially revised locales: gd_GB, ht_HT
3143
3144 * The LC_ADDRESS field was updated to support country_car for almost all
3145   supported locales.
3146
3147 * ISO 1427 definitions were updated.
3148
3149 * ISO 3166 definitions were updated.
3150
3151 * The localedef utility now supports --big-endian and --little-endian
3152   command-line options to generate locales for a different system from that
3153   for which the C library was built.
3154
3155 * Binary locale files now only depend on the endianness of the system for
3156   which they are generated and not on other properties of that system.  As a
3157   consequence, binary files generated with new localedef may be incompatible
3158   with old versions of the GNU C Library, and binary files generated with
3159   old localedef may be incompatible with this version of the GNU C Library,
3160   in the following circumstances:
3161
3162   + Locale files may be incompatible on m68k systems.
3163
3164   + Locale archive files (but not separate files for individual locales) may
3165     be incompatible on systems where plain "char" is signed.
3166
3167 * The configure option --disable-versioning has been removed.  Builds with
3168   --disable-versioning had not worked for several years.
3169
3170 * ISO 639 definitions were updated for Chiga (cgg) and Chinese (gan, hak, czh,
3171   cjy, lzh, cmn, mnp, cdo, czo, cpx, wuu, hsn, yue).
3172
3173 * SystemTap probes for malloc have been introduced.
3174
3175 * SystemTap probes for slow multiple precision fallback paths of
3176   transcendental functions have been introduced.
3177
3178 * Support for powerpc64le has been added.
3179
3180 * The soft-float powerpc port now supports e500 processors.
3181
3182 * Support for STT_GNU_IFUNC symbols added for ppc32/power4+ and ppc64.
3183
3184 * A new feature test macro _DEFAULT_SOURCE is available to enable the same
3185   set of header declarations that are enabled by default, even when other
3186   feature test macros or compiler options such as -std=c99 would otherwise
3187   disable some of those declarations.
3188
3189 * The _BSD_SOURCE feature test macro no longer enables BSD interfaces that
3190   conflict with POSIX.  The libbsd-compat library (which was a dummy library
3191   that did nothing) has also been removed.
3192
3193 * Preliminary documentation about Multi-Thread, Async-Signal and
3194   Async-Cancel Safety has been added.
3195
3196 * Change of ABI data structures for s390 and s390x:
3197   On s390 and s390x the size of struct ucontext and jmp_buf was increased to
3198   allow for future hardware extensions. All library functions that accept or
3199   return these structures were versioned in order to provide backwards
3200   compatibility with existing code. However, not all cases can be handled
3201   with interface versioning. If an application embeds either structure into
3202   another structure and that structure is passed to another compilation unit
3203   which expects the newer larger-sized object then any access to the new
3204   fields will result in undefined behaviour. Similarly any access to fields
3205   that were moved by the enlarging of the structures will cause undefined
3206   behaviour. To fix the undefined behaviour all objects that are part of the
3207   final in-memory image must agree on the size of structures, and this may
3208   require recompilation.
3209 \f
3210 Version 2.18
3211
3212 * The following bugs are resolved with this release:
3213
3214   2546, 2560, 5159, 6809, 7006, 10060, 10062, 10283, 10357, 10686, 11120,
3215   11561, 12310, 12387, 12492, 12515, 12723, 13550, 13889, 13951, 13988,
3216   14142, 14176, 14200, 14256, 14280, 14293, 14317, 14327, 14478, 14496,
3217   14582, 14686, 14812, 14888, 14894, 14907, 14908, 14909, 14920, 14941,
3218   14952, 14964, 14981, 14982, 14985, 14991, 14994, 14996, 15000, 15003,
3219   15006, 15007, 15014, 15020, 15022, 15023, 15036, 15054, 15055, 15062,
3220   15078, 15084, 15085, 15086, 15100, 15160, 15214, 15221, 15232, 15234,
3221   15283, 15285, 15287, 15304, 15305, 15307, 15309, 15327, 15330, 15335,
3222   15336, 15337, 15339, 15342, 15346, 15359, 15361, 15366, 15380, 15381,
3223   15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419, 15423, 15424,
3224   15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465, 15480, 15485,
3225   15488, 15490, 15492, 15493, 15497, 15506, 15529, 15536, 15553, 15577,
3226   15583, 15618, 15627, 15631, 15654, 15655, 15666, 15667, 15674, 15711,
3227   15755, 15759.
3228
3229 * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
3230   has been fixed by disabling the use of pt_chown (Bugzilla #15755).
3231   Distributions can re-enable building and using pt_chown via the new configure
3232   option `--enable-pt_chown'.  Enabling the use of pt_chown carries with it
3233   considerable security risks and should only be used if the distribution
3234   understands and accepts the risks.
3235
3236 * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
3237   #15078).
3238
3239 * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
3240   fixed (Bugzilla #15330).
3241
3242 * Add support for calling C++11 thread_local object destructors on thread
3243   and program exit.  This needs compiler support for offloading C++11
3244   destructor calls to glibc.
3245
3246 * Improved worst case performance of libm functions with double inputs and
3247   output.
3248
3249 * Support for priority inherited mutexes in pthread condition variables on
3250   non-x86 architectures.
3251
3252 * Port to Xilinx MicroBlaze contributed by David Holsgrove.
3253
3254 * Optimized string functions for AArch64.  Implemented by Marcus Shawcroft.
3255
3256 * Optimized string functions for ARM.  Implemented by Will Newton and
3257   Richard Henderson.
3258
3259 * Optimized libm functions for SPARC.  Implemented by David S. Miller.
3260
3261 * Support for building more of ARM glibc as Thumb-2 code.  Implemented by
3262   Richard Henderson.
3263
3264 * Support for building most of MIPS glibc as MIPS16 code.  Implemented by
3265   Chung-Lin Tang, Maciej W. Rozycki and Maxim Kuvyrkov.
3266
3267 * Added a benchmark framework to track performance of functions in glibc.
3268
3269 * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
3270   It is based on draft TS 18661 and currently enabled as a GNU extension.
3271
3272 * On Linux, the clock function now uses the clock_gettime system call
3273   for improved precision, rather than old times system call.
3274
3275 * Added support for version-3 tz format files.  This is needed when using
3276   the tz database release 2013e or later, and affects a few unusual cases --
3277   currently only TZ='America/Godthab' for time stamps after 2037.
3278
3279 * Added new API functions pthread_getattr_default_np and
3280   pthread_setattr_default_np to get and set the default pthread
3281   attributes of a process.
3282
3283 * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.
3284   This may improve lock scaling of existing programs on TSX capable systems.
3285   When the --enable-lock-elision=yes parameter is specified at configure
3286   time lock elision will be enabled by default for all PTHREAD_MUTEX_DEFAULT
3287   mutexes.
3288
3289 * Support added for AT_HWCAP2 (to coincide with Linux kernel 3.10
3290   availability).  Implemented by Ryan S. Arnold.
3291
3292 * Support added for POWER8 platform.  Implemented by Ryan S. Arnold.
3293 \f
3294 Version 2.17
3295
3296 * The following bugs are resolved with this release:
3297
3298   1349, 3439, 3479, 3665, 5044, 5246, 5298, 5400, 6530, 6677, 6778, 6808,
3299   9685, 9914, 10014, 10038, 10114, 10191, 10631, 10873, 11438, 11607, 11638,
3300   11741, 12140, 13013, 13412, 13542, 13601, 13603, 13604, 13629, 13679,
3301   13696, 13698, 13717, 13741, 13759, 13761, 13763, 13881, 13939, 13950,
3302   13952, 13966, 14042, 14047, 14090, 14150, 14151, 14152, 14154, 14157,
3303   14166, 14173, 14195, 14197, 14237, 14246, 14251, 14252, 14283, 14298,
3304   14303, 14307, 14328, 14331, 14336, 14337, 14347, 14349, 14368, 14376,
3305   14417, 14447, 14459, 14476, 14477, 14501, 14505, 14510, 14516, 14518,
3306   14519, 14530, 14532, 14538, 14543, 14544, 14545, 14557, 14562, 14568,
3307   14576, 14579, 14583, 14587, 14595, 14602, 14610, 14621, 14638, 14645,
3308   14648, 14652, 14660, 14661, 14669, 14672, 14683, 14694, 14716, 14719,
3309   14743, 14767, 14783, 14784, 14785, 14793, 14796, 14797, 14801, 14803,
3310   14805, 14807, 14811, 14815, 14821, 14822, 14824, 14828, 14831, 14833,
3311   14835, 14838, 14856, 14863, 14865, 14866, 14868, 14869, 14871, 14872,
3312   14879, 14889, 14893, 14898, 14914.
3313
3314 * Optimization of memcpy for MIPS.
3315
3316 * CVE-2011-4609 svc_run() produces high cpu usage when accept fails with
3317   EMFILE has been fixed (Bugzilla #14889).
3318
3319 * The add-on ports collection is now distributed in the "ports" subdirectory
3320   of the main GNU C Library distribution, rather than separately.
3321
3322 * Port to ARM AArch64 contributed by Linaro.
3323
3324 * Support for STT_GNU_IFUNC symbols added for s390 and s390x.
3325   Optimized versions of memcpy, memset, and memcmp added for System z10 and
3326   zEnterprise z196.
3327   Implemented by Andreas Krebbel.
3328
3329 * The new function secure_getenv allows secure access to the environment,
3330   returning NULL if running in a SUID/SGID process.  This function replaces
3331   the internal function __secure_getenv.
3332
3333 * SystemTap static probes have been added into the dynamic linker.
3334   Implemented by Gary Benson.
3335
3336 * Optimizations of string functions strstr, strcasestr and memmem.
3337   Implemented by Maxim Kuvyrkov.
3338
3339 * The minimum Linux kernel version that this version of the GNU C Library
3340   can be used with is 2.6.16.
3341
3342 * Optimizations of string functions memchr, wcschr, wcscpy, and wcsrchr for
3343   powerpc POWER7.  Implemented by Will Schmidt.
3344
3345 * New configure option --disable-nscd builds the C library such that it
3346   never attempts to contact the Name Service Caching Daemon (nscd).
3347   New configure option --disable-build-nscd avoids building nscd itself;
3348   this is the default if --disable-nscd is used.
3349
3350 * Improved support for cross-compilation, including cross-testing and
3351   bootstrap builds without a previously built glibc.
3352
3353 * Several testsuite tests are now able to test multiple IFUNC variants of an
3354   interface, rather than just testing the one that would be chooen by
3355   default.
3356
3357 * New configure options --with-bugurl and --with-pkgversion, for
3358   distributors to use to embed their bug-reporting and package version
3359   information in --help and --version output.
3360
3361 * The ttyname and ttyname_r functions on Linux now fall back to searching for
3362   the tty file descriptor in /dev/pts or /dev if /proc is not available.  This
3363   allows creation of chroots without the procfs mounted on /proc.
3364
3365 * The `crypt' function now fails if passed salt bytes that violate the
3366   specification for those values.  On Linux, the `crypt' function will
3367   consult /proc/sys/crypto/fips_enabled to determine if "FIPS mode" is
3368   enabled, and fail on encrypted strings using the MD5 or DES algorithm
3369   when the mode is enabled.
3370
3371 * The `clock_*' suite of functions (declared in <time.h>) is now available
3372   directly in the main C library.  Previously it was necessary to link with
3373   -lrt to use these functions.  This change has the effect that a
3374   single-threaded program that uses a function such as `clock_gettime' (and
3375   is not linked with -lrt) will no longer implicitly load the pthreads
3376   library at runtime and so will not suffer the overheads associated with
3377   multi-thread support in other code such as the C++ runtime library.
3378
3379 * New locales: ayc_PE, doi_IN, ia_FR, mni_IN, nhn_MX, niu_NU, niu_NZ,
3380   sat_IN, and szl_PL.
3381 \f
3382 Version 2.16
3383
3384 * The following bugs are resolved with this release:
3385
3386   174, 208, 350, 369, 411, 706, 766, 2074, 2541, 2547, 2548, 2550, 2551,
3387   2552, 2553, 2554, 2562, 2563, 2565, 2566, 2570, 2576, 2636, 2678, 3335,
3388   3440, 3748, 3768, 3866, 3868, 3906, 3976, 3992, 4026, 4108, 4596, 4822,
3389   5077, 5461, 5805, 5993, 6471, 6486, 6578, 6649, 6730, 6770, 6794, 6884,
3390   6890, 6894, 6895, 6907, 6911, 6959, 7064, 9739, 9902, 10110, 10135, 10140,
3391   10153, 10210, 10254, 10346, 10375, 10545, 10716, 10846, 10882, 11174,
3392   11261, 11322, 11365, 11451, 11494, 11521, 11677, 11837, 11959, 12047,
3393   12097, 12193, 12194, 12297, 12298, 12301, 12340, 12354, 12416, 12495,
3394   13058, 13223, 13361, 13525, 13526, 13527, 13528, 13529, 13530, 13531,
3395   13532, 13533, 13547, 13551, 13552, 13553, 13555, 13556, 13559, 13563,
3396   13566, 13576, 13579, 13583, 13592, 13594, 13613, 13618, 13637, 13656,
3397   13658, 13673, 13691, 13695, 13704, 13705, 13706, 13718, 13726, 13738,
3398   13739, 13743, 13750, 13758, 13760, 13761, 13775, 13786, 13787, 13792,
3399   13806, 13824, 13840, 13841, 13844, 13846, 13848, 13851, 13852, 13854,
3400   13871, 13872, 13873, 13879, 13882, 13883, 13884, 13885, 13886, 13892,
3401   13895, 13908, 13910, 13911, 13912, 13913, 13914, 13915, 13916, 13917,
3402   13918, 13919, 13920, 13921, 13922, 13923, 13924, 13926, 13927, 13928,
3403   13938, 13941, 13942, 13954, 13955, 13956, 13963, 13967, 13968, 13970,
3404   13973, 13979, 13983, 13986, 13996, 14012, 14027, 14033, 14034, 14036,
3405   14040, 14043, 14044, 14048, 14049, 14050, 14053, 14055, 14059, 14064,
3406   14075, 14080, 14083, 14103, 14104, 14109, 14112, 14117, 14122, 14123,
3407   14134, 14153, 14183, 14188, 14199, 14210, 14218, 14229, 14241, 14273,
3408   14277, 14278.
3409
3410 * Support for the x32 ABI on x86-64 added.  The x32 target is selected by
3411   configuring glibc with:
3412         BUILD_CC='gcc' CC='gcc -mx32' CXX='g++ -mx32'
3413   Visit <http://sites.google.com/site/x32abi/> for more x32 ABI info.
3414   Implemented by H.J. Lu.
3415
3416 * ISO C11 support:
3417
3418   + define static_assert
3419
3420   + do not declare gets
3421
3422   + declare at_quick_exit and quick_exit also for ISO C11
3423
3424   + aligned_alloc.  NB: The code is deliberately allows the size parameter
3425     to not be a multiple of the alignment.  This is a moronic requirement
3426     in the standard but it is only a requirement on the caller, not the
3427     implementation.
3428
3429   + timespec_get added
3430
3431   + uchar.h support added
3432
3433   + CMPLX, CMPLXF, CMPLXL added
3434
3435   Implemented by Ulrich Drepper.
3436
3437 * Support for the IA-64 has been moved to ports.
3438
3439 * Remove support for anything but ELF binary format
3440
3441 * Checking versions of poll, ppoll added.
3442   Implemented by Ulrich Drepper.
3443
3444 * More generic and 64-bit performance optimizations to math functions.
3445   Implemented by Ulrich Drepper.
3446
3447 * New configure option --enable-obsolete-rpc makes the deprecated RPC
3448   headers and functions available at compile time as they were before
3449   version 2.14.  This option will be removed at some time in the future
3450   after the TI-RPC library becomes fully sufficient for the needs of
3451   existing applications.
3452
3453 * Compatibility code for Linux kernel versions before 2.4 has been removed.
3454   Note that glibc is not expected to work with any Linux kernel version
3455   before 2.6.
3456
3457 * New header <sys/auxv.h> and function getauxval allowing easy access to
3458   the AT_* key-value pairs passed from the Linux kernel.  The header also
3459   defines the HWCAP_* bits associated with the AT_HWCAP key.
3460
3461 * New locales: mag_IN
3462
3463 * New configure option --enable-systemtap builds SystemTap static probes
3464   into libc for setjmp and longjmp and into libpthread for various operations.
3465   So far the setjmp/longjmp probes and some of the libpthread probes are
3466   provided only for i*86 and x86_64.
3467   Implemented by Roland McGrath and Rayson Ho.
3468
3469 * Optimized expf for x86-32 and x86-64.  Implemented by Liubov Dmitrieva.
3470
3471 * More optimized functions for PowerPC.  Implemented by Adhemerval Zanella
3472   and Will Schmidt.
3473
3474 * More optimized functions for SPARC.  Implemented by David S. Miller.
3475
3476 * Improved support for cross-compilation, especially bootstrap builds
3477   without a previously built glibc.
3478
3479 * Ports for the TILE-Gx and TILEPro families of processors.  Contributed by
3480   Chris Metcalf from Tilera.
3481
3482 * Support for the old ARM ABI has been removed from ports.  Only the EABI is
3483   now supported for ARM processors.
3484
3485 * The hard-float variant of the ARM EABI now uses /lib/ld-linux-armhf.so.3
3486   as the name of the dynamic linker, to distinguish it from the
3487   /lib/ld-linux.so.3 dynamic linker used for the base EABI.
3488
3489 * Support for CRIS has been removed from ports.
3490
3491 * A new class of installed header has been documented for low-level
3492   platform-specific functionality.  PowerPC added the first instance with a
3493   function to provide time base register access.  Contributed by Tulio
3494   Magno Quites Machado Filho.
3495
3496 * ix86 configurations now install header files that are consistent with
3497   what x86-64 configurations install.  These same header files can be used
3498   for -m32, -m64, or -mx32 builds.
3499   Contributed by H.J. Lu.
3500
3501 * Math library bug fixes.  A thorough audit of all open math library bugs was
3502   conducted by Joseph Myers.  Significant progress was made on many math
3503   library bugs resulting in more accurate exceptions and function results.
3504   Many thanks to all those that contributed including Andreas Jaeger for his
3505   patch review and work on the x87 trigonometric instruction issues.
3506
3507 * Timezone data is no longer installed.  Timezone-related binaries and scripts
3508   will continue to be installed.  Users should obtain their timezone data from
3509   their distribution provider or from the tzdata package at
3510   <ftp://munnari.oz.au/pub/>.
3511 \f
3512 Version 2.15
3513
3514 * The following bugs are resolved with this release:
3515
3516   6779, 6783, 9696, 10103, 10709, 11589, 11929, 12403, 12786, 12840, 12847,
3517   12868, 12852, 12874, 12885, 12892, 12906, 12907, 12922, 12935, 12962,
3518   13007, 13021, 13061, 13062, 13067, 13068, 13085, 13088, 13090, 13092,
3519   13096, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
3520   13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
3521   13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
3522   13484, 13506, 13515, 13523, 13524, 13538, 13540
3523
3524 * New program pldd to list loaded object of a process
3525   Implemented by Ulrich Drepper.
3526
3527 * Add nss_db support back to glibc.  No more dependency on Berkeley db
3528   and support for initgroups lookups.
3529   Implemented by Ulrich Drepper.
3530
3531 * Optimized strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-32.
3532   Contributed by HJ Lu.
3533
3534 * Improved strcpy, strncpy, stpcpy, stpncpy for SSE2 and SSSE3 on x86-64.
3535   Contributed by HJ Lu.
3536
3537 * Optimized strcat, strncat on x86-64 and optimized wcscmp, wcslen, strnlen
3538   on x86-32 and x86-64.
3539   Contributed by Liubov Dmitrieva.
3540
3541 * Optimized strchr and strrchr for SSE on x86-32.
3542   Contributed by Liubov Dmitrieva.
3543
3544 * Optimized memchr, memrchr, rawmemchr, memcmp, wmemcmp, wcschr, wcscpy
3545   for x86-64 and x86-32.
3546   Contributed by Liubov Dmitrieva.
3547
3548 * New interfaces: scandirat, scandirat64
3549   Implemented by Ulrich Drepper.
3550
3551 * Checking versions of FD_SET, FD_CLR, and FD_ISSET added.
3552   Implemented by Ulrich Drepper.
3553
3554 * nscd now also caches the netgroup database.
3555   Implemented by Ulrich Drepper.
3556
3557 * Integrate libm with gcc's -ffinite-math-only option.
3558   Implemented by Ulrich Drepper.
3559
3560 * Lots of generic, 64-bit, and x86-64-specific performance optimizations
3561   to math functions.  Implemented by Ulrich Drepper.
3562
3563 * Optimized strcasecmp and strncasecmp for AVX on x86-64.
3564   Implemented by Ulrich Drepper.
3565
3566 * New Linux interfaces: process_vm_readv, process_vm_writev
3567
3568 * Optimized strcasecmp and strncasecmp for SSSE3 and SSE4.2 on x86-32.
3569   Implemented by Ulrich Drepper.
3570
3571 * Optimized nearbyint and strcasecmp for PPC.
3572   Implemented by Adhemerval Zanella.
3573
3574 * New locales: bho_IN, unm_US, es_CU, ta_LK
3575 \f
3576 Version 2.14
3577
3578 * The following bugs are resolved with this release:
3579
3580   386, 6420, 7101, 9730, 9732, 9809, 10138, 10149, 10157, 11099, 11257,
3581   11258, 11487, 11532, 11558, 11578, 11634, 11653, 11668, 11697, 11724,
3582   11781, 11799, 11820, 11837, 11857, 11884, 11892, 11895, 11901, 11945,
3583   11947, 11952, 11987, 12052, 12083, 12158, 12178, 12200, 12346, 12350,
3584   12393, 12420, 12432, 12445, 12449, 12453, 12454, 12460, 12469, 12489,
3585   12509, 12510, 12511, 12518, 12527, 12541, 12545, 12551, 12582, 12583,
3586   12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655,
3587   12660, 12671, 12681, 12684, 12685, 12711, 12713, 12714, 12717, 12723,
3588   12724, 12734, 12738, 12746, 12766, 12775, 12777, 12782, 12788, 12792,
3589   12795, 12811, 12813, 12814, 12841
3590
3591 * The RPC implementation in libc is obsoleted.  Old programs keep working
3592   but new programs cannot be linked with the routines in libc anymore.
3593   Programs in need of RPC functionality must be linked against TI-RPC.
3594   The TI-RPC implementation is IPv6 enabled and there are other benefits.
3595
3596   Visible changes of this change include (obviously) the inability to link
3597   programs using RPC functions without referencing the TI-RPC library and the
3598   removal of the RPC headers from the glibc headers.
3599   Implemented by Ulrich Drepper.
3600
3601 * New Linux interfaces: clock_adjtime, name_to_handle_at, open_by_handle_at,
3602   syncfs, setns, sendmmsg
3603
3604 * New locales: os_RU, bem_ZA, en_ZA, ff_SN, sw_KE, sw_TZ, lb_LU, wae_CH,
3605   yue_HK, lij_IT, mhr_RU
3606
3607 * New encodings: CP770, CP771, CP772, CP773, CP774
3608
3609 * New program sotruss to trace calls through PLTs
3610   Implemented by Ulrich Drepper.
3611
3612 * The malloc hook implementation is marked deprecated and will be removed
3613   from the default implementation in the next version.  The design never
3614   worked ever since the introduction of threads.  Even programs which do
3615   not create threads themselves can use multiple threads created internally.
3616 \f
3617 Version 2.13
3618
3619 * The following bugs are resolved with this release:
3620
3621   3268, 6812, 7066, 10085, 10484, 10563, 10851, 11149, 11155, 11577, 11611,
3622   11640, 11655, 11701, 11840, 11856, 11883, 11903, 11904, 11968, 11979,
3623   12005, 12037, 12067, 12077, 12078, 12092, 12093, 12107, 12108, 12113,
3624   12140, 12159, 12167, 12191, 12194, 12201, 12204, 12205, 12207, 12348,
3625   12378, 12394, 12397
3626
3627 * New Linux interfaces: prlimit, prlimit64, fanotify_init, fanotify_mark
3628
3629 * POWER7 optimizations: memset, memcmp, strncmp
3630
3631 * New optimized string functions for x86-64: strnlen (SSE2),
3632   strcasecmp (SSE2, SSSE3, SSE4.2), strncasecmp (SSE2, SSSE3, SSE4.2)
3633   Implemented by Ulrich Drepper.
3634 \f
3635 Version 2.12
3636
3637 * The following bugs are resolved with this release:
3638
3639   3662, 4457, 5553, 10162, 10401, 10414, 10554, 10824, 10864, 10915,
3640   10918, 10936, 10939, 10958, 10968, 10969, 10972, 10992, 11000, 11001,
3641   11007, 11010, 11027, 11039, 11040, 11041, 11043, 11046, 11056, 11070,
3642   11093, 11115, 11125, 11126, 11127, 11134, 11141, 11149, 11183, 11184,
3643   11185, 11186, 11187, 11188, 11189, 11190, 11191, 11192, 11193, 11194,
3644   11200, 11230, 11235, 11242, 11254, 11258, 11271, 11272, 11276, 11279,
3645   11287, 11292, 11319, 11332, 11333, 11387, 11389, 11390, 11394, 11397,
3646   11410, 11438, 11449, 11470, 11471, 11520, 11537, 11538, 11571
3647
3648 * New interfaces: pthread_getname_np, pthread_setname_np
3649
3650 * New Linux interface: recvmmsg
3651
3652 * STT_GNU_IFUNC implemented for Sparc by David Miller.
3653
3654 * The dynamic linker now recognizes supported ABI versions from the
3655   EI_ABIVERSION field in the ELF header.
3656   Implemented by Ulrich Drepper.
3657
3658 * New NIS mode selector ADJUNCT_AS_SHADOW.  The passwd.adjunct.byname table
3659   will not be used to fill in password fields in the passwd.byname replies.
3660   Instead it is used to synthesize the shadow.byname table, should it be
3661   missing.  This is a useful mode in some installations involving Solaris.
3662   Implemented by Ulrich Drepper.
3663
3664 * New locales: kok_IN, sq_MK, cv_RU
3665 \f
3666 Version 2.11
3667
3668 * The following bugs are resolved with this release:
3669
3670   3270, 7094, 9924, 9986, 10011, 10085, 10107, 10159, 10162, 10166, 10183,
3671   10195, 10196, 10200, 10203, 10207, 10211, 10213, 10217, 10221, 10229,
3672   10262, 10286, 10312, 10315, 10319, 10349, 10360, 10391, 10402, 10416,
3673   10418, 10422, 10425, 10446, 10448, 10452, 10540, 10553, 10560, 10564,
3674   10609, 10643, 10692, 10713, 10717, 10730, 10731, 10742, 10780, 10784,
3675   10789, 10817, 10823, 10840, 10847
3676
3677 * New interfaces: execvpe, pthread_sigqueue, mkstemps, mkstemps64, mkostemps,
3678   mkostemps64
3679   Implemented by Ulrich Drepper.
3680
3681 * Checking version of longjmp added that fails if an uninitialized stack
3682   frame would be created.  Implemented by Ulrich Drepper.
3683
3684 * STT_GNU_IFUNC is now supported in static executables.
3685   Implemented by H.J. Lu.
3686
3687 * STT_GNU_IFUNC implemented for PPC by Alan Modra.
3688
3689 * New optimized string functions for x86-64: strstr, strcasestr, memcmp,
3690   strcspn, strpbrk, strspn, strcpy, stpcpy, strncpy, strcmp (SSE2, SSE4.2),
3691   strncmp (SSE2, SSE4.2), strchr (SSE4.2), strrchr (SSE4.2).
3692   Contributed by H.J. Lu.
3693
3694   strlen, rawmemchr, strcmp (SSSE3), strncmp (SSSE3).
3695   Implemented by Ulrich Drepper.
3696
3697 * New optimized string functions for x86: strlen, strcspn, strspn, strpbrk,
3698   strstr, strcasestr.
3699   Contributed by H.J. Lu.
3700
3701 * Support for fma instruction in AVX on x86-64.
3702   Implemented by H.J. Lu and Ulrich Drepper.
3703
3704 * AVX support in x86-64 auditing support in ld.so.
3705   Implemented by H.J. Lu.
3706
3707 * STB_GNU_UNIQUE support added.
3708   Implemented by Ulrich Drepper.
3709
3710 * Implement second fallback mode for optimized DNS lookup for even more
3711   broken environments.  If two requests from the same port are not
3712   handled correctly close the socket and open a new one before sending
3713   the second request.  The 'single-request-reopen' option in /etc/resolv.conf
3714   can be used to select this mode right away, instead of rediscovering the
3715   necessity is every process again.
3716   Implemented by Ulrich Drepper.
3717
3718 * New resolver flag RES_USE_DNSSEC to enable use of verified lookup.
3719   Implemented by Adam Tkac.
3720
3721 * Optimized iconv conversions for S390x.
3722   Implemented by Andreas Krebbel.
3723
3724 * Using condvars with PI mutexes is now more efficient due to kernel
3725   support for requeueing to PI futexes.  NPTL support added for x86-64.
3726   Implemented by Ulrich Drepper.
3727
3728 * New locales: ps_AF, my_MM
3729 \f
3730 Version 2.10
3731
3732 * The following bugs are resolved with this release:
3733
3734   697, 5381, 5807, 6411, 6545, 7040, 7058, 7067, 7080, 7083, 7095, 7098,
3735   9677, 9694, 9697, 9701, 9704, 9705, 9706, 9720, 9726, 9730, 9733, 9736,
3736   9741, 9750, 9753, 9759, 9781, 9791, 9793, 9823, 9833, 9844, 9880, 9881,
3737   9891, 9893, 9895, 9913, 9916, 9920, 9948, 9955, 9957, 9963, 9985, 10052,
3738   10069, 10086, 10087, 10090, 10092, 10093, 10100, 10118, 10128
3739
3740 * New interfaces: preadv, preadv64, pwritev, pwritev64, malloc_info
3741   Implemented by Ulrich Drepper.
3742
3743 * New Linux interfaces: accept4, fallocate, fallocate64.
3744   Implemented by Ulrich Drepper.
3745
3746 * Correct declarations of string function when used in C++ code.  This
3747   could lead to compile errors for invalid C++ code.
3748
3749 * XPG7/POSIX 2008 compilation environment.  Many GNU-specific functions are
3750   now in POSIX.
3751
3752 * New POSIX 2008 interface: psiginfo
3753   Implemented by Ulrich Drepper.
3754
3755 * New ISO C++1x interfaces: quick_exit, at_quick_exit
3756   Implemented by Ulrich Drepper.
3757
3758 * Support for selecting between multiple function definitions at runtime
3759   using STT_GNU_IFUNC symbols.  Implemented by Ulrich Drepper.
3760
3761 * The libcrypt library can now use the hash function implementations in
3762   NSS.  Implemented by Ulrich Drepper.
3763
3764 * The malloc implementation can be compiled to be less memory efficient
3765   but higher performing in multi-threaded programs.
3766   Implemented by Ulrich Drepper.
3767
3768 * New locales: nan_TW@latin, ks_IN
3769
3770 * Faster strlen, strchr, strchrnul, strrchr, memchr, and rawmemchr for x86-64.
3771   Implemented by Ulrich Drepper.
3772
3773 * Extended printf hook support.  It is possible to use user-defined types
3774   and extend existing format specifiers.
3775   Implemented by Ulrich Drepper.
3776
3777 * Handling for group shadow files has been added.
3778   Implemented by Ulrich Drepper.
3779
3780 * DNS IPv4-IPv6 parallel lookup now deals better with broken DNS
3781   servers (the case, e.g., for some people using the built-in DNS
3782   server in ADSL modems/routers).  There is a once-per-process timeout
3783   in case of a broken server.  To avoid it, users can run nscd or put
3784   'options single-request' in /etc/resolv.conf.
3785   Implemented by Ulrich Drepper.
3786 \f
3787 Version 2.9
3788
3789 * The following bugs are resolved with this release:
3790
3791   3406, 5209, 5210, 5381, 5794, 5814, 5911, 6428, 6438, 6442, 6447, 6461,
3792   6472, 6505, 6544, 6589, 6612, 6634, 6653, 6654, 6657, 6698, 6712, 6713,
3793   6719, 6723, 6724, 6740, 6763, 6771, 6790, 6791, 6817, 6824, 6839, 6843,
3794   6845, 6856, 6857, 6860, 6867, 6875, 6919, 6920, 6942, 6947, 6955, 6966,
3795   6968, 6974, 6980, 6995, 7008, 7009, 7029
3796
3797 * Unified lookup for getaddrinfo: IPv4 and IPv6 addresses are now looked
3798   up at the same time.  Implemented by Ulrich Drepper.
3799
3800 * TLS descriptors for LD and GD on x86 and x86-64.
3801   Implemented by Alexandre Oliva.
3802
3803 * getaddrinfo now handles DCCP and UDPlite.
3804   Implemented by Ulrich Drepper.
3805
3806 * New fixed-size conversion macros: htobe16, htole16, be16toh, le16toh,
3807   htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh.
3808   Implemented by Ulrich Drepper.
3809
3810 * New implementation of memmem, strstr, and strcasestr which is O(n).
3811   Implemented by Eric Blake.
3812
3813 * New Linux interfaces: inotify_init1, dup3, epoll_create1, pipe2
3814
3815 * Implement "e" option for popen to open file descriptor with the
3816   close-on-exec flag set.  Implemented by Ulrich Drepper.
3817
3818 * Implement "b" mode for fmemopen.  In this mode writes writes don't
3819   implicitly add a NUL byte and seeks from the end of the buffer really
3820   use the buffer end, not the string length as the basis.
3821   Implemented by Ulrich Drepper.
3822
3823 * Many functions, exported and internal, now atomically set the close-on-exec
3824   flag when run on a sufficiently new kernel.  Implemented by Ulrich Drepper.
3825
3826 * Sorting rules for some Indian languages (Kannada, Gurumukhi, Telugu,
3827   Sinhala)
3828   Implemented by Pravin Satpute.
3829
3830 * New locales: sd_IN, sd_IN@devanagari, ks_IN@devanagari, ht_HT, en_AG, nl_AW.
3831 \f
3832 Version 2.8
3833
3834 * The following bugs are resolved with this release:
3835
3836   2549, 3112, 4314, 4407, 4997, 5012, 5040, 5112, 5204, 5208, 5209, 5220,
3837   5222, 5224, 5225, 5237, 5238, 5240, 5245, 5277, 5346, 5375, 5378, 5382,
3838   5424, 5427, 5428, 5435, 5436, 5439, 5441, 5442, 5443, 5451, 5452, 5454,
3839   5455, 5463, 5464, 5465, 5475, 5477, 5478, 5520, 5541, 5545, 5553, 5600,
3840   5602, 5607, 5614, 5627, 5628, 5736, 5737, 5741, 5753, 5760, 5762, 5768,
3841   5774, 5777, 5778, 5779, 5786, 5790, 5818, 5854, 5857, 5903, 5939, 5979,
3842   5983, 5995, 5998, 6004, 6007, 6020, 6021, 6024, 6040, 6042
3843
3844 * New locales: bo_CN, bo_IN, shs_CA.
3845
3846 * New encoding: HP-ROMAN9, HP-GREEK8, HP-THAI8, HP-TURKISH8.
3847
3848 * Sorting rules for some Indian languages (Devanagari and Gujarati).
3849   Implemented by Pravin Satpute.
3850
3851 * IPV6 addresses in /etc/resolv.conf can now have a scope ID
3852
3853 * nscd caches now all timeouts for DNS entries
3854   Implemented by Ulrich Drepper.
3855
3856 * nscd is more efficient and wakes up less often.
3857   Implemented by Ulrich Drepper.
3858
3859 * More checking functions: asprintf, dprintf, obstack_printf, vasprintf,
3860   vdprintf, and obstack_vprintf.
3861   Implemented by Jakub Jelinek.
3862
3863 * Faster memset for x86-64.
3864   Implemented by Harsha Jagasia and H.J. Lu.
3865
3866 * Faster memcpy on x86.
3867   Implemented by Ulrich Drepper.
3868
3869 * ARG_MAX is not anymore constant on Linux.  Use sysconf(_SC_ARG_MAX).
3870   Implemented by Ulrich Drepper.
3871
3872 * Faster sqrt and sqrtf implemention for some PPC variants.
3873   Implemented by Steven Munroe.
3874 \f
3875 Version 2.7
3876
3877 * The following bugs are resolved with this release:
3878
3879   4125, 4126, 4178, 4359, 4407, 4512, 4514, 4525, 4554, 4556, 4557, 4566,
3880   4582, 4586, 4588, 4599, 4610, 4647, 4702, 4705, 4726, 4745, 4772, 4773,
3881   4775, 4776, 4792, 4813, 4814, 4816, 4833, 4858, 4860, 4896, 4905, 4925,
3882   4936, 4937, 4938, 4941, 4946, 4963, 4972, 5010, 5028, 5043, 5058, 5063,
3883   5071, 5103, 5104, 5112, 5113, 5184, 5186
3884
3885 * More checking functions: fread, fread_unlocked, open*, mq_open.
3886   Implemented by Jakub Jelinek and Ulrich Drepper.
3887
3888 * Extend fortification to C++.  Implemented by Jakub Jelinek.
3889
3890 * Implement 'm' modifier for scanf.  Add stricter C99/SUS compliance
3891   by not recognizing 'a' as a modifier when those specs are requested.
3892   Implemented by Jakub Jelinek.
3893
3894 * PPC optimizations to math and string functions.
3895   Implemented by Steven Munroe.
3896
3897 * New interfaces: mkostemp, mkostemp64.  Like mkstemp* but allow additional
3898   options to be passed.  Implemented by Ulrich Drepper.
3899
3900 * More CPU set manipulation functions.  Implemented by Ulrich Drepper.
3901
3902 * New Linux interfaces: signalfd, eventfd, eventfd_read, and eventfd_write.
3903   Implemented by Ulrich Drepper.
3904
3905 * Handle private futexes in the NPTL implementation.
3906   Implemented by Jakub Jelinek and Ulrich Drepper.
3907
3908 * Add support for O_CLOEXEC.  Implement in Hurd.  Use throughout libc.
3909   Implemented by Roland McGrath and Ulrich Drepper.
3910
3911 * Linux/x86-64 vDSO support.  Implemented by Ulrich Drepper.
3912
3913 * SHA-256 and SHA-512 based password encryption.
3914   Implemented by Ulrich Drepper.
3915
3916 * New locales: ber_DZ, ber_MA, en_NG, fil_PH, fur_IT, fy_DE, ha_NG, ig_NG,
3917   ik_CA, iu_CA, li_BE, li_NL, nds_DE, nds_NL, pap_AN, sc_IT, tk_TM, ug_CN,
3918   yo_NG.
3919
3920 + New iconv modules: MAC-CENTRALEUROPE, ISO-8859-9E, KOI8-RU.
3921   Implemented by Ulrich Drepper.
3922 \f
3923 Version 2.6
3924
3925 * The following bugs are resolved with this release:
3926
3927   3156, 3213, 3285, 3291, 3306, 3313, 3320, 3322, 3325, 3326, 3334, 3348,
3928   3352, 3363, 3369, 3426, 3427, 3429, 3451, 3458, 3465, 3480, 3483, 3493,
3929   3514, 3515, 3559, 3632, 3664, 3673, 3674, 3745, 3747, 3818, 3840, 3842,
3930   3851, 3855, 3884, 3885, 3902, 3905, 3919, 3944, 3954, 3955, 3957, 3991,
3931   3995, 3996, 4024, 4040, 4069, 4070, 4074, 4076, 4096, 4101, 4102, 4114,
3932   4130, 4131, 4181, 4276, 4306, 4342, 4344, 4349, 4364, 4368, 4381, 4392,
3933   4403, 4405, 4406, 4411, 4438, 4439, 4455, 4456, 4465, 4512, 4514, 4586,
3934   4702, 4858
3935
3936 * New Linux interfaces: epoll_pwait, sched_getcpu.
3937
3938 * New generic interfaces: strerror_l.
3939
3940 * nscd can now cache the services database.   Implemented by Ulrich Drepper.
3941 \f
3942 Version 2.5
3943
3944 * The following bugs are resolved with this release:
3945
3946   39, 68, 192, 352, 388, 531, 935, 1006, 1201, 1203, 1386, 1782, 1783, 1784,
3947   1785, 1786, 1787, 1951, 1974, 1996, 2072, 2098, 2125, 2134, 2158, 2182,
3948   2349, 2376, 2386, 2389, 2415, 2418, 2420, 2423, 2450, 2451, 2466, 2472,
3949   2473, 2477, 2498, 2499, 2501, 2502, 2505, 2507, 2508, 2509, 2517, 2526,
3950   2569, 2571, 2592, 2611, 2625, 2632, 2644, 2662, 2680, 2683, 2684, 2693,
3951   2695, 2703, 2734, 2751, 2764, 2766, 2775, 2792, 2821, 2823, 2832, 2841,
3952   2843, 2883, 2892, 2908, 2914, 2926, 2961, 2978, 2980, 2987, 2997, 2998,
3953   3013, 3018, 3034, 3040, 3044, 3123, 3124, 3137, 3138, 3143, 3155, 3189,
3954   3225, 3251, 3252, 3253, 3273
3955
3956 * For Linux, the sorting of addresses returned by getaddrinfo now also
3957   handles rules 3, 4, and 7 from RFC 3484.  I.e., all rules are handled.
3958   Implemented by Ulrich Drepper.
3959
3960 * Allow system admin to configure getaddrinfo with the /etc/gai.conf file.
3961   Implemented by Ulrich Drepper.
3962
3963 * New Linux interfaces: splice, tee, sync_file_range, vmsplice.
3964
3965 * New iconv module for MIK.  Contributed by Alexander Shopov.
3966
3967 * For sites with broken group and/or passwd database, the auto-propagate
3968   option of nscd can prevent creating ID lookup entries from the results
3969   of a name lookup and vice versa.   This usually is no problem but some
3970   site might have problems with the default behavior.
3971   Implemented by Ulrich Drepper.
3972
3973 * Iterating over entire database in NIS can be slow.  With the
3974   SETENT_BATCH_READ option in /etc/default/nss a system admin can decide
3975   to trade time for memory.  The entire database will be read at once.
3976   Implemented by Ulrich Drepper.
3977
3978 * The interfaces introduced in RFC 3542 have been implemented by
3979   Ulrich Drepper.
3980
3981 * Support for the new ELF hash table format was added by Ulrich Drepper.
3982
3983 * Support for priority inheritance mutexes added by Jakub Jelinek and
3984   Ulrich Drepper.
3985
3986 * Support for priority protected mutexes added by Jakub Jelinek.
3987
3988 * New locales: nr_ZA, pa_PK, ca_AD, ca_FR, ca_IT, el_CY, tr_CY, as_IN,
3989   or_IN, csb_PL, fy_NL, sr_ME.
3990 \f
3991 Version 2.4
3992
3993 * More overflow detection functions.
3994
3995 * New iconv converters for IBM1025, IBM1122, IBM1137, IBM1153,
3996   IBM1154, IBM1155, IBM1156, IBM1157, and IBM1158 contributed by Jiro Sekiba.
3997
3998   More converters for IBM803, IBM901, IBM902, IBM921, IBM1008, IBM1097,
3999   IBM1112, IBM1123, IBM1130, IBM1140, IBM1141, IBM1142, IBM1143, IBM1144,
4000   IBM1145, IBM1146, IBM1147, IBM1148, IBM1149, IBM1166, IBM1167, IBM4517,
4001   IBM4899, IBM4909, IBM4971, IBM5347, IBM9030, IBM9066, IBM9448, IBM12712,
4002   IBM16804, IBM1364, IBM1371, IBM1388, IBM1390, and IBM1399 contributed
4003   by Masahide Washizawa.
4004
4005 * It is now possible to install audit libraries for the dynamic linker using
4006   LD_AUDIT.  Implemented by Ulrich Drepper.
4007
4008 * The LinuxThreads add-on, providing pthreads on Linux 2.4 kernels, is no
4009   longer supported.  The new NPTL implementation requires Linux 2.6 kernels.
4010   For a libc and libpthread that works well on Linux 2.4 kernels, we
4011   recommend using the stable 2.3 branch.
4012
4013 * The new function open_wmemstream acts like open_memstream,
4014   but uses a wchar_t wide character buffer.
4015
4016 * The new function ppoll is an improved version of poll, similar to pselect.
4017
4018 * New interfaces: fdopendir, openat, fstatat, fchmodat, fchownat,
4019   futimesat, faccessat, mkdirat, mkfifoat, mknodat,
4020   renameat, unlinkat, linkat, symlinkat, readlinkat.
4021
4022 * New Linux kernel system calls: unshare,
4023   inotify_init, inotify_add_watch, inotify_rm_watch.
4024
4025 * The euidaccess function is now also known by the alias eaccess,
4026   for compatibility with some other systems.
4027
4028 * Timezone data updated to 2006b version.
4029 \f
4030 Version 2.3.6
4031
4032 * The following bugs are resolved with this release:
4033
4034   38, 253, 549, 622, 653, 721, 758, 851, 877, 915, 934, 955, 961,
4035   1016, 1037, 1076, 1079, 1080, 1081, 1082, 1083, 1084, 1085, 1086,
4036   1087, 1088, 1090, 1091, 1092, 1093, 1094, 1095, 1096, 1097, 1098,
4037   1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109,
4038   1110, 1111, 1112, 1113, 1125, 1137, 1138, 1249, 1250, 1251, 1252,
4039   1253, 1254, 1350, 1358, 1394, 1438, 1498, 1534
4040
4041   Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
4042
4043 * As of this release, GCC 4 can be used to compile the C Library.
4044
4045 * Timezone data updated to 2005m version.
4046 \f
4047 Version 2.3.5
4048
4049 * The following bugs are resolved with this release:
4050
4051   284, 592, 602, 626, 633, 640, 650, 661, 671, 681, 693, 700, 710, 719,
4052   722, 723, 725, 726, 727, 728, 729, 730, 731, 732, 733, 734, 735, 736,
4053   737, 738, 739, 740, 741, 742, 743, 744, 745, 765, 767, 768, 769, 776,
4054   777, 787, 821, 822, 823, 825
4055
4056   Visit <http://sources.redhat.com/bugzilla/> for the details of each bug.
4057 \f
4058 Version 2.3.4
4059
4060 * Support for RFC 3678.  Real implementations exist only for Linux so far.
4061   Implemented by Ulrich Drepper.
4062
4063 * nscd can now cache entries persistently.  Expiring entries are reloaded.
4064   For speedups the cache can be shared in memory with client processes.
4065   Implemented by Ulrich Drepper.
4066
4067 * nscd can now perform SELinux checks.
4068   Implemented by Matthew Rickard <mjricka@epoch.ncsc.mil>.
4069
4070 * getaddrinfo queries are now cached.  Canonical name lookup is performed
4071   efficiently.
4072   Implemented by Ulrich Drepper.
4073
4074 * The nothrow function attribute is used when headers are used by gcc when
4075   compiling C code.  This can avoid significant amounts of exception
4076   handling data.
4077
4078 * The malloc functions perform more error checking and are stricter when
4079   it comes to reacting on errors.  The default action is to terminate
4080   the process after showing an error message.  Implemented by Ulrich Drepper.
4081
4082 * Reverse lookups of IPv6 addresses does not use bit string or .ip6.int
4083   lookups anymore unless explicitly requested.  Implemented by Ulrich Drepper.
4084
4085 * Namespaces in ld.so are implemented.  DSOs can be loaded in separate
4086   namespaces using the new function dlmopen().  This feature is of course,
4087   like most other dynamic loading functionality, not available in statically
4088   linked applications.  Implemented by Ulrich Drepper.
4089
4090 * Low-overhead boundary checking variants of string and some stdio functions
4091   were added.  These are to be used in conjunction with a gcc patch by
4092   Jakub Jelinek which adds calls to these functions if possible.
4093   Implemented by Jakub Jelinek and Ulrich Drepper.
4094
4095 * Old code for several operating systems and machine architectures that
4096   have not been in working condition in a long time have been removed from
4097   the main source tree maintained by the GNU C Library's maintainers.
4098   These files are now reside in the separate `ports' source module
4099   that is usable as an add-on when building the library.
4100 \f
4101 Version 2.3.3
4102
4103 * New functions `dladdr1' and `dlinfo' in <dlfcn.h> provide more ways to
4104   interrogate the dynamic linker, compatible with the Solaris interface.
4105
4106 * ELF thread-local storage support (TLS) now works on PowerPC and PowerPC64;
4107   implemented by Paul Mackerras, Steven Munroe, and Roland McGrath.
4108
4109 * getifaddrs now uses the netlink interface on Linux to get its information.
4110   Implemented by Thorsten Kukuk.
4111
4112 * getaddrinfo now implements AI_V4MAPPED, AI_ALL, and AI_ADDRCONF.
4113   Implemented by Ulrich Drepper.
4114
4115 * support for non-executable stacks on x86 has been added.  Changes mostly
4116   by Roland McGrath.
4117
4118 * regex is now much faster for multibyte locales.  Changes by Jakub Jelinek
4119   and Ulrich Drepper.
4120
4121 * getaddrinfo now performs destination address selection according to
4122   RFC 3484.
4123 \f
4124 Version 2.3.2
4125
4126 * Thread-safe interfaces for many functions that access locale data
4127   were added in version 2.3, but these features were omitted from NEWS.
4128   Many functions have variants with an `_l' suffix that take a `locale_t'
4129   object as a parameter rather than consulting the current locale.
4130   The new functions `newlocale', `duplocale', and `freelocale' in <locale.h>
4131   create and maintain `locale_t' objects.  Additionally, the new function
4132   `uselocale' sets "the current locale" (as used by functions not so
4133   parameterized) set for an individual thread.  These features were added
4134   in version 2.3, implemented by Ulrich Drepper and Roland McGrath.
4135
4136 * The functions getresuid, getresgid, setresuid, and setresgid, which
4137   have long been available on Linux, are now declared in <unistd.h>
4138   and are now also available on the Hurd.
4139
4140 * ELF thread-local storage support (TLS) now works on x86-64.
4141
4142 * The new dynamic string token $LIB is expanded in shared library names.
4143   This normally expands to lib, but on some 64-bit platforms to lib64 instead.
4144
4145 * Aldy Hernandez contributed complete software floating point support for
4146   PowerPC machines with no FPU.
4147
4148 * fexecve is implemented on Linux.
4149
4150 * The `btowc' function should work at least twice as fast due to
4151   specialized callbacks in the iconv modules.  Implemented by Bruno Haible.
4152
4153 * With approriate thread add-ons cancelable functions are now implemented
4154   in libc.so as well.  No need to call the function in libpthread.  This
4155   change allowed to finally disable the incorrect and expensive handling
4156   of weak definition in ld.so.
4157
4158 * Yet more PLT entries in libc.so have been removed.  We finally arrived
4159   at the bare minimum.  Startup times improved appropriately.
4160
4161 * Support for the new Linux/x86 system call interface was added.  The
4162   AT_SYSINFO auxiliary vector entry is recognized and handled.
4163 \f
4164 Version 2.3
4165
4166 * Masahide Washizawa contributed iconv modules for IBM1163 and IBM1164
4167   charsets.
4168
4169 * iconv (the program and the interface) now accepts empty names (excluding
4170   options like //TRANSLIT) to mean "use charset of current locale".
4171
4172 * localedef can now transliterate characters in strings which are not in
4173   the provided charmap.  The information from the input locale is used.
4174
4175 * Prelinking support was added for ELF targets.  This requires additional
4176   tools and recent versions of the GNU binutils.  Contributed by Jakub Jelinek.
4177
4178 * Read-only stdio streams now use mmap to speed up operation by eliminating
4179   copying and buffer underflows.  To use add 'm' to the mode string of
4180   the fopen/fdopen/freopen call.  Implemented by Ulrich Drepper.
4181
4182 * The malloc functions were completely rewritten by Wolfram Gloger based
4183   on Doug Lea's malloc-2.7.0.c.
4184
4185 * Isamu Hasegawa contributed a completely new and POSIX-conformant
4186   implementation of regex.
4187
4188 * Bruno Haible upgraded the iconv and locale implementation to support
4189   Unicode 3.2.
4190
4191 * Contents of the LC_* and LANG environment variables in the CEN style are
4192   not recognized anymore.   It never was used.  Change by Ulrich Drepper.
4193
4194 * The runtime (ld.so, libc, libpthread for Linux) now can handle the ELF
4195   thread-local storage (TLS) ABI on some platforms.
4196   Changes by Ulrich Drepper.  SH support by Kaz Kojima.
4197
4198 * Bruno Haible contributed iconv converters for ISO-2022-JP-3, SHIFT JIS-X0213,
4199   EUC-JISX0213, and TSCII.
4200
4201 * New header <ifaddrs.h> with functions `getifaddrs' and `freeifaddrs':
4202   BSD-compatible interface for getting all network interface addresses.
4203   Implementation for IPv4 by Roland McGrath.
4204
4205 * Loading of locale data is faster due to the introduction of a locale
4206   archive.  Implemented by Roland McGrath and Ulrich Drepper.
4207
4208 * Startup times are significantly reduced by not using exported functions
4209   inside the library itself.  Changes by Jakub Jelinek, Roland McGrath,
4210   and Ulrich Drepper.
4211
4212 * Steven Munroe contributed a port to PowerPC64/Linux.
4213 \f
4214 Version 2.2.6
4215
4216 * The Hurd now uses the GNU libio implementation of stdio rather than the
4217   old GNU stdio implementation, and uses a new ABI (libc.so.0.3).
4218
4219 * The Hurd on x86 now has the `ioperm' function and <sys/io.h> header file
4220   with the same behavior as the Linux system call of the same name.
4221 \f
4222 Version 2.2.5
4223
4224 * Stephen Moshier implemented log2, log10, powl and cbrtl for the
4225   128-bit long double format.
4226
4227 * Masahide Washizawa contributed iconv modules for IBM1132, IBM1133, IBM1160,
4228   IBM1161, and IBM1162 charsets.
4229
4230 * Andreas Jaeger contributed a port to x86-64/Linux.
4231
4232 * Peter Bruin contributed a port to PowerPC/Hurd.
4233
4234 * libc functions using I/O streams now can handle wide-oriented streams
4235   as well.
4236
4237 * optimizations in the dynamic linker.  Binaries created by recent binutils
4238   versions start up quicker due to reduced time spent on relocations.
4239
4240 * Support for use of gcc3 added by Jakub Jelinek and HJ Lu.
4241 \f
4242 Version 2.2.4
4243
4244 * Stephen Moshier implemented cosh, expm1, log1p, acos, sinh, tanh,
4245   asinh, atanh, j0 for the 128-bit long double format.
4246
4247 * Bruno Haible updated all the code handling Unicode in some form to
4248   support Unicode 3.1.
4249
4250 * Speed of regex for single-byte locales is back to previous levels.
4251   Patch by Isamu Hasegawa.
4252
4253 * Alpha, SPARC, and IA-64 now also using floating stacks.
4254
4255 * Startup time of internationalized applications greatly improved through
4256   iconv cache.  Use iconvconfig to generate the cache file.
4257   Contributed by Ulrich Drepper.
4258
4259 * The IA-64 specific part of ld.so was rewritten to eliminate some pretty
4260   severe performance problems.  Patch by David Mosberger.
4261
4262 * The Hurd port got a lot more functionality like AIO, various stdio
4263   extensions, etc.  Mainly done by Roland McGrath.
4264
4265 * mtrace can now lookup symbols in shared libraries.
4266 \f
4267 Version 2.2.3
4268
4269 * Intel's IA-64 math library is largely integrated.  It provides fast and
4270   accurate implementatations for most basic and standard math functions
4271   in float, double, and long double format.
4272
4273 * Stephen Moshier implemented j0, j1, jn, y0, y1, yn, lgamma, erf, erfc,
4274   and asin for the 96-bit long double format and asin, log, tan for the
4275   128-bit long double format.
4276
4277 * The beginning of a last-bit accurate math library by IBM Haifa were added.
4278   The basic double functions exist today.  Contributed by Abraham Ziv
4279   <ziv@il.ibm.com>, Moshe Olshansky <olshansk@il.ibm.com>, Ealan Henis
4280   <ealan@il.ibm.com>, and Anna Reitman <reitman@il.ibm.com>.
4281
4282 * An asynchronous name lookup library was added.  The interface is designed
4283   after POSIX AIO.  The proposal was circulated beforehand to get comments.
4284   No negative ones came in.  Implemented by Ulrich Drepper.
4285
4286 * Port to S390/64bit contributed by Martin Schwidefsky
4287   <schwidefsky@de.ibm.com>.
4288
4289 * David Mosberger <davidm@hpl.hp.com> implemented the setcontext family
4290   of functions for Linux/IA-64.
4291
4292 * The RPC code is now thread safe.  Threads can now use the same service
4293   of different services at the same time.  Patch by Eric Norum
4294   <eric.norum@usask.ca> with some help by Ulrich Drepper.
4295
4296 * Martin Schwidefsky <schwidefsky@de.ibm.com> implemented the setcontext
4297   family of functions for Linux/S390.
4298
4299 * Ulrich Drepper <drepper@redhat.com> implemented the setcontext family
4300   of functions for Linux/x86.
4301
4302 * Port to Linux/CRIS contributed by Axis Communications.
4303 \f
4304 Version 2.2.2
4305
4306 * Lots of headers were cleaned up.  Using the tool in the conform/ subdir
4307   we can now check for namespace violations and missing declarations.  The
4308   result is that almost all headers are now Unix-compliant (as defined in
4309   the upcoming XPG6).  The negative side is that some programs might need
4310   corrections, too, if they depend on the incorrect form of the headers in
4311   previous versions which defined too many symbols and included too many
4312   other headers.
4313
4314 * regex now handles multibyte character sets correctly.
4315   Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
4316
4317 * iconv (the program) does now conform to the upcoming XPG6 and handles
4318   charmaps.  Instead of the charset names the path of charmaps can be
4319   provided and the conversion happens based on this data.
4320   Contributed by Ulrich Drepper.
4321
4322 * The locale program now provides detailed information about the installed
4323   locales.  While
4324
4325     locale -a
4326
4327   only lists the names of the supported locales
4328
4329     locale -a --verbose
4330
4331   provides details such as country, language, and codeset name.
4332   Contributed by Ulrich Drepper.
4333 \f
4334 Version 2.2.1
4335
4336 * The gencat program now parses the input file according to the charset
4337   selected by the LC_CTYPE category.  This is important for stateful
4338   character sets.  To make generating catalogs easier there is a way
4339   to overwrite the charset selected by the locale: before the first
4340   message or $ quote line the catalog can contain a line like
4341
4342     $ codeset=ISO-8859-2
4343
4344   to select the charset (ISO-8859-2 in this case).
4345
4346   Implemented by Shinya Hanataka and Ulrich Drepper.
4347
4348 * New codeset conversion modules: IBM-922  (Estonia PC codeset),
4349   IBM-1124 (Ukraine PC codeset), IBM-1129 (Vietnamese PC codeset).
4350   Contributed by Masahide Washizawa <washi@jp.ibm.com>.
4351
4352 * Optimized string functions for Alpha ev6 and ev67 by Richard Henderson
4353   <rth@redhat.com> and Rick Gorton <rick.gorton@alpha-processor.com>.
4354
4355 * The LANGUAGE environment variable is now ignored unless the locale is
4356   changed from the default "C" locale.
4357
4358 * The usual bug fixes.
4359 \f
4360 Version 2.2
4361
4362 * Greg McGary added runtime support for bounds checking using gcc's
4363   new -fbounded-pointers option.  ix86 target is complete.  PowerPC
4364   is in progress.
4365
4366 * Thorsten Kukuk added secure mode support to nscd.
4367
4368 * The Berkeley db libraries have been removed.
4369
4370   Related, the nss_db module is now in a separate package since it
4371   obviously requires a database library being available.
4372
4373 * Wide character I/O streams implemented by Ulrich Drepper.
4374
4375 * Functions from the extended socket API added by Ulrich Drepper.
4376
4377 * Functions feenableexcept and fedisableexcept to control the
4378   behaviour of individual exceptions have been added by Andreas Jaeger.
4379
4380 * ldconfig program added by Andreas Jaeger and Jakub Jelinek.
4381
4382 * The resolver code has been updated from bind 8.2.3-T5B which supports
4383   threads.  The integration was done by Andreas Jaeger, Adam D. Bradley,
4384   and Mark Kettenis.
4385
4386   This change could in some situations effect backward compatibility.  Since
4387   now `_res' is a thread-local instead of a global variable, modifying it
4388   in one thread does not have any effect in other threads.
4389
4390   The resolver library was also extended to allow IPv6 as the transport
4391   protocol for the requests.  This work was done by Stig Venaas.
4392
4393 * Compatibility code for K&R C compilers has been removed from the
4394   header files.  A ISO C compiler is needed to use the library
4395   (conforming to either C89 or C99 standard).
4396
4397 * Complete rewrite of the localedef program to support multibyte character
4398   sets.  Implement handling of ISO 14651 and ISO 14652.  Rewrite strcoll,
4399   strxfrm, wcscoll, and wcsxfrm functions.  Make isw*() functions work.
4400   Implemented by Ulrich Drepper.
4401
4402   Bruno Haible significantly improved the generation and use of the data
4403   structures for the wide character tables.
4404
4405 * Plural handling in gettext implemented by Ulrich Drepper.
4406
4407 * The utmp daemon has been removed.
4408
4409 * The port to MIPS-Linux has been finished by Andreas Jaeger.
4410
4411 * A port to Hitachi SH3 and SH4 has been contributed by Kazumoto Kojima
4412   and Yutaka Niibe.
4413
4414 * POSIX clocks and timers implemented by Kaz Kylheku and Ulrich Drepper.
4415
4416 * POSIX barriers implemented by Kaz Kylheku.
4417
4418 * POSIX spawn function family implemented by Ulrich Drepper.
4419
4420 * POSIX spinlocks are now available.
4421
4422 * Timed wait functions for mutex, rwlock, and semaphores are implemented.
4423
4424 * the configure option --enable-kernel=X.Y.Z allows to strip out
4425   compatibility for kernel versions before X.Y.Z.  This is currently only
4426   implemented for Linux.
4427
4428 * the sockaddr_in6 structure changed.  The IPv6 working group added a new
4429   field sin6_scope_id.  This means that all programs using IPv6 should be
4430   recompiled.  Don't expect binary compatibility with previous glibc
4431   versions.
4432
4433 * various conversion modules for IBM character sets contributed by
4434   Masahide Washizawa.
4435
4436 * IA-64 port by Jes Sorensen and HJ Lu.
4437 \f
4438 Version 2.1.3
4439
4440 * bug fixes
4441
4442 \f
4443 Version 2.1.2
4444
4445 * bug fixes
4446
4447 \f
4448 Version 2.1.1
4449
4450 * New ISO C 9x function _Exit, imaxabs, and imaxdiv are added.
4451
4452 * New xdr functions are added; some rpc functions are now 64bit clean.
4453
4454 * Fixed a number of bugs and memory leaks (especially in NIS+ code).
4455
4456 * Fixed known incompatibilities with glibc 2.0.
4457
4458 * New functions lock64, strchrnul, rawmemchr, getutmp and getutmpx.
4459
4460 * Optimized a number of functions (especially the ELF dynamic loader).
4461
4462 * Update timezone data files.
4463
4464 * lots of charmaps corrections
4465
4466 * some new locale definitions and charmaps
4467
4468 \f
4469 Version 2.1
4470
4471 * Richard Henderson corrected size of struct timeval on Linux/Alpha to
4472   conform to POSIX member type requirements.  Symbol versions have been
4473   adjusted as needed within the library, and for direct use by applications,
4474   but there is potential for problems if third-party libraries use
4475   struct timeval as part of their interface.  This does not present
4476   a problem for X and other "essential" system libraries.
4477
4478 * An additional locale model to support C++ Standard Library locale
4479   model and probably more was implemented by Ulrich Drepper.
4480
4481 * Eric Youngdale and Ulrich Drepper implemented versioning of objects on
4482   symbol level.
4483
4484 * Miles Bader provided the `argp' function family to support hierachical
4485   command line argument parsing, layered on top of getopt.
4486
4487 * strtod accepts new hexadecimal floating-point format from ISO C 9X.
4488
4489 * printf has two new specifiers %a and %A to print hexadecimal flaoting-point
4490   numbers.
4491
4492 * scanf recognizes the %a and %A format for scanning floating point numbers.
4493
4494 * the new headers <stdint.h> and <inttypes.h> from ISO C 9X provides
4495   information and interfaces for the available integer types.
4496
4497 * about 130 new math functions were added to implement the ISO C9x math
4498   library.
4499
4500 * the new header <complex.h> contains definitions of the complex math
4501   functions from ISO C 9X.
4502
4503 * the new header <tgmath.h> defines generic macros to use complex or
4504   real valued functions.
4505
4506 * Thorsten Kukuk provided an implementation for NIS+, securelevel 0, 1 and 2.
4507
4508 * Andreas Jaeger provided a test suite for the math library.
4509
4510 * Mark Kettenis implemented the utmpx interface and an utmp daemon.
4511
4512 * Ulrich Drepper added character set conversion functions (iconv).
4513
4514 * Optimized string functions have been added.
4515
4516 * The localedata addon is now part of glibc.
4517
4518 * An implementation of profiling shared libraries was added by Ulrich Drepper.
4519
4520 * Thorsten Kukuk and Ulrich Drepper provided an implementation for a caching
4521   daemon for NSS (nscd).
4522
4523   Missing a better place here are some numbers on improvements.  Under
4524   Linux 2.1.125 un-tar-ing the kernel sources takes
4525
4526                                   user  system     wall
4527
4528     using local files           12.19s   6.88s   22.91s
4529
4530     using NIS                   13.92s   8.91s   26.34s
4531
4532     using NIS & nscd            10.37s   7.34s   25.30s
4533
4534     using NIS+                  27.57s  30.37s  640.46s
4535
4536     using NIS+ & nscd           10.25s   7.83s   26.51s
4537
4538     using NIS & old nscd [1]    13.83s   8.32s   29.60s
4539
4540   Keep in mind that non-namelookup related operations dominate above times.
4541   It was just a common complain that using NIS+ unpacking the kernel is
4542   horribly slow.
4543
4544   [1] The old nscd implementation is not available anymore since it was
4545   distributed with glibc up to version 2.0.98 and thus is now replaced.
4546
4547 * Tim Waugh provided an implementation of the POSIX.2 wordexp function family.
4548
4549 * Mark Kettenis provided a Hesiod NSS module.
4550
4551 * The ELF dynamic loader knows how to process dynamic string tokens ($ORIGIN
4552   and $PLATFORM) in RPATHs and similar strings (Ulrich Drepper).
4553
4554 * rcmd can now handle netgroups (Dick Streefland).
4555
4556 * A port to the ARM was contributed by Phil Blundell, Pat Beirne and Scott
4557   Bambrough.
4558
4559 * Support for the IPv6 protocol has been added to the socket API, as per the
4560   latest draft standards.
4561
4562 * Support for Linux 2.2 has been added.
4563
4564 * Interface changes relative to the latest 2.0.x release:
4565 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4566 addseverity                     NEW: Unix98
4567 alphasort64                     NEW: LFS
4568 argp_err_exit_status            NEW: argp, GNU ext
4569 argp_error                      NEW: argp, GNU ext
4570 argp_failure                    NEW: argp, GNU ext
4571 argp_help                       NEW: argp, GNU ext
4572 argp_parse                      NEW: argp, GNU ext
4573 argp_program_bug_address        NEW: argp, GNU ext
4574 argp_program_version            NEW: argp, GNU ext
4575 argp_program_version_hook       NEW: argp, GNU ext
4576 argp_state_help                 NEW: argp, GNU ext
4577 argp_usage                      NEW: argp, GNU ext
4578 authdes_create                  NEW: Secure RPC
4579 authdes_getucred                NEW: Secure RPC
4580 authdes_pk_create               NEW: Secure RPC
4581 backtrace                       NEW: GNU ext.
4582 backtrace_symbols               NEW: GNU ext.
4583 backtrace_symbols_fd            NEW: GNU ext.
4584 cacos                           NEW: ISO C 9x
4585 cacosf                          NEW: ISO C 9x
4586 cacosh                          NEW: ISO C 9x
4587 cacoshf                         NEW: ISO C 9x
4588 cacoshl                         NEW: ISO C 9x
4589 cacosl                          NEW: ISO C 9x
4590 capget                          NEW: kernel
4591 capset                          NEW: kernel
4592 carg                            NEW: ISO C 9x
4593 cargf                           NEW: ISO C 9x
4594 cargl                           NEW: ISO C 9x
4595 casin                           NEW: ISO C 9x
4596 casinf                          NEW: ISO C 9x
4597 casinh                          NEW: ISO C 9x
4598 casinhf                         NEW: ISO C 9x
4599 casinhl                         NEW: ISO C 9x
4600 casinl                          NEW: ISO C 9x
4601 catan                           NEW: ISO C 9x
4602 catanf                          NEW: ISO C 9x
4603 catanh                          NEW: ISO C 9x
4604 catanhf                         NEW: ISO C 9x
4605 catanhl                         NEW: ISO C 9x
4606 catanl                          NEW: ISO C 9x
4607 cbc_crypt                       NEW: Secure RPC
4608 ccos                            NEW: ISO C 9x
4609 ccosf                           NEW: ISO C 9x
4610 ccosh                           NEW: ISO C 9x
4611 ccoshf                          NEW: ISO C 9x
4612 ccoshl                          NEW: ISO C 9x
4613 ccosl                           NEW: ISO C 9x
4614 cexp                            NEW: ISO C 9x
4615 cexpf                           NEW: ISO C 9x
4616 cexpl                           NEW: ISO C 9x
4617 cimag                           NEW: ISO C 9x
4618 cimagf                          NEW: ISO C 9x
4619 cimagl                          NEW: ISO C 9x
4620 clearerr_locked                 REMOVED
4621 clntunix_create                 NEW: sunrpc ext
4622 clog                            NEW: ISO C 9x
4623 clog10                          NEW: ISO C 9x
4624 clog10f                         NEW: ISO C 9x
4625 clog10l                         NEW: ISO C 9x
4626 clogf                           NEW: ISO C 9x
4627 clogl                           NEW: ISO C 9x
4628 conj                            NEW: ISO C 9x
4629 conjf                           NEW: ISO C 9x
4630 conjl                           NEW: ISO C 9x
4631 cpow                            NEW: ISO C 9x
4632 cpowf                           NEW: ISO C 9x
4633 cpowl                           NEW: ISO C 9x
4634 cproj                           NEW: ISO C 9x
4635 cprojf                          NEW: ISO C 9x
4636 cprojl                          NEW: ISO C 9x
4637 creal                           NEW: ISO C 9x
4638 crealf                          NEW: ISO C 9x
4639 creall                          NEW: ISO C 9x
4640 creat64                         NEW: LFS
4641 csin                            NEW: ISO C 9x
4642 csinf                           NEW: ISO C 9x
4643 csinh                           NEW: ISO C 9x
4644 csinhf                          NEW: ISO C 9x
4645 csinhl                          NEW: ISO C 9x
4646 csinl                           NEW: ISO C 9x
4647 csqrt                           NEW: ISO C 9x
4648 csqrtf                          NEW: ISO C 9x
4649 csqrtl                          NEW: ISO C 9x
4650 ctan                            NEW: ISO C 9x
4651 ctanf                           NEW: ISO C 9x
4652 ctanh                           NEW: ISO C 9x
4653 ctanhf                          NEW: ISO C 9x
4654 ctanhl                          NEW: ISO C 9x
4655 ctanl                           NEW: ISO C 9x
4656 des_setparity                   NEW: Secure RPC
4657 ecb_crypt                       NEW: Secure RPC
4658 endutxent                       NEW: Unix98
4659 exp10                           NEW: ISO C 9x
4660 exp10f                          NEW: ISO C 9x
4661 exp10l                          NEW: ISO C 9x
4662 exp2                            NEW: ISO C 9x
4663 exp2f                           NEW: ISO C 9x
4664 exp2l                           NEW: ISO C 9x
4665 fattach                         NEW: STREAMS
4666 fdetach                         NEW: STREAMS
4667 fdim                            NEW: ISO C 9x
4668 fdimf                           NEW: ISO C 9x
4669 fdiml                           NEW: ISO C 9x
4670 feclearexcept                   NEW: ISO C 9x
4671 fegetenv                        NEW: ISO C 9x
4672 fegetexceptflag                 NEW: ISO C 9x
4673 fegetround                      NEW: ISO C 9x
4674 feholdexcept                    NEW: ISO C 9x
4675 feof_locked                     REMOVED
4676 feraiseexcept                   NEW: ISO C 9x
4677 ferror_locked                   REMOVED
4678 fesetenv                        NEW: ISO C 9x
4679 fesetexceptflag                 NEW: ISO C 9x
4680 fesetround                      NEW: ISO C 9x
4681 fetestexcept                    NEW: ISO C 9x
4682 feupdateenv                     NEW: ISO C 9x
4683 fflush_locked                   REMOVED
4684 ffsl                            NEW: GNU ext.
4685 ffsll                           NEW: GNU ext.
4686 fgetpos64                       NEW: LFS
4687 fgets_unlocked                  NEW: GNU ext.
4688 fileno_locked                   REMOVED
4689 fma                             NEW: ISO C 9x
4690 fmaf                            NEW: ISO C 9x
4691 fmal                            NEW: ISO C 9x
4692 fmax                            NEW: ISO C 9x
4693 fmaxf                           NEW: ISO C 9x
4694 fmaxl                           NEW: ISO C 9x
4695 fmin                            NEW: ISO C 9x
4696 fminf                           NEW: ISO C 9x
4697 fminl                           NEW: ISO C 9x
4698 fmtmsg                          NEW: Unix98
4699 fopen64                         NEW: LFS
4700 fputc_locked                    REMOVED
4701 fputs_unlocked                  NEW: GNU ext.
4702 fread_unlocked                  NEW: GNU ext.
4703 freopen64                       NEW: LFS
4704 fseeko                          NEW: Unix98
4705 fsetpos64                       NEW: LFS
4706 fstatfs64                       NEW: LFS
4707 fstatvfs                        NEW: Unix98
4708 fstatvfs64                      NEW: LFS
4709 ftello                          NEW: Unix98
4710 ftello64                        NEW: LFS
4711 ftruncate64                     NEW: LFS
4712 ftw64                           NEW: LFS
4713 fwrite_unlocked                 NEW: GNU ext.
4714 gai_strerror                    NEW: IPv6
4715 gamma_r                         REMOVED
4716 gammaf_r                        REMOVED
4717 gammal_r                        REMOVED
4718 getchar_locked                  REMOVED
4719 getdate                         NEW: Unix98
4720 getdate_err                     NEW: Unix98
4721 getdate_r                       NEW: GNU ext.
4722 getmsg                          NEW: STREAMS
4723 getnameinfo                     NEW: IPv6
4724 getnetname                      NEW: Secure RPC
4725 getpmsg                         NEW: STREAMS
4726 getpt                           NEW: Unix98 PTY
4727 getrlimit64                     NEW: LFS
4728 getutxent                       NEW: Unix98
4729 getutxid                        NEW: Unix98
4730 getutxline                      NEW: Unix98
4731 glob64                          NEW: GNU ext.
4732 globfree64                      NEW: GNU ext.
4733 gnu_get_libc_release            NEW: GNU ext.
4734 gnu_get_libc_version            NEW: GNU ext.
4735 grantpt                         NEW: Unix98 PTY
4736 host2netname                    NEW: Secure RPC
4737 iconv                           NEW: iconv
4738 iconv_close                     NEW: iconv
4739 iconv_open                      NEW: iconv
4740 if_freenameindex                NEW: IPv6
4741 if_indextoname                  NEW: IPv6
4742 if_nameindex                    NEW: IPv6
4743 if_nametoindex                  NEW: IPv6
4744 in6addr_any                     NEW: IPv6
4745 in6addr_loopback                NEW: IPv6
4746 inet6_isipv4mapped              NEW: IPv6
4747 isastream                       NEW: STREAMS
4748 iswblank                        NEW: GNU ext.
4749 key_decryptsession              NEW: Secure RPC
4750 key_decryptsession_pk           NEW: Secure RPC
4751 key_encryptsession              NEW: Secure RPC
4752 key_encryptsession_pk           NEW: Secure RPC
4753 key_gendes                      NEW: Secure RPC
4754 key_get_conv                    NEW: Secure RPC
4755 key_secretkey_is_set            NEW: Secure RPC
4756 key_setnet                      NEW: Secure RPC
4757 key_setsecret                   NEW: Secure RPC
4758 llrint                          NEW: ISO C 9x
4759 llrintf                         NEW: ISO C 9x
4760 llrintl                         NEW: ISO C 9x
4761 llround                         NEW: ISO C 9x
4762 llroundf                        NEW: ISO C 9x
4763 llroundl                        NEW: ISO C 9x
4764 log2                            NEW: ISO C 9x
4765 log2f                           NEW: ISO C 9x
4766 log2l                           NEW: ISO C 9x
4767 lrint                           NEW: ISO C 9x
4768 lrintf                          NEW: ISO C 9x
4769 lrintl                          NEW: ISO C 9x
4770 lround                          NEW: ISO C 9x
4771 lroundf                         NEW: ISO C 9x
4772 lroundl                         NEW: ISO C 9x
4773 lseek64                         NEW: LFS
4774 makecontext                     NEW: Unix98
4775 mempcpy                         NEW: GNU ext.
4776 mmap64                          NEW: LFS
4777 moncontrol                      REMOVED
4778 modify_ldt                      NEW: kernel
4779 nan                             NEW: ISO C 9x
4780 nanf                            NEW: ISO C 9x
4781 nanl                            NEW: ISO C 9x
4782 nearbyint                       NEW: ISO C 9x
4783 nearbyintf                      NEW: ISO C 9x
4784 nearbyintl                      NEW: ISO C 9x
4785 netname2host                    NEW: Secure RPC
4786 netname2user                    NEW: Secure RPC
4787 nexttoward                      NEW: ISO C 9x
4788 nexttowardf                     NEW: ISO C 9x
4789 nexttowardl                     NEW: ISO C 9x
4790 nftw                            NEW: Unix98
4791 nftw64                          NEW: LFS
4792 open64                          NEW: LFS
4793 passwd2des                      NEW: Secure RPC
4794 pow10                           NEW: GNU ext.
4795 pow10f                          NEW: GNU ext.
4796 pow10l                          NEW: GNU ext.
4797 pread                           NEW: Unix98
4798 pread64                         NEW: LFS
4799 printf_size                     NEW: GNU ext.
4800 printf_size_info                NEW: GNU ext.
4801 profil_counter                  REMOVED
4802 pthread_mutexattr_getkind_np    REPLACED
4803 pthread_mutexattr_setkind_np    REPLACED
4804 ptsname                         NEW: Unix98 PTY
4805 ptsname_r                       NEW: Unix98 PTY
4806 putc_locked                     REMOVED
4807 putchar_locked                  REMOVED
4808 putgrent                        NEW: GNU ext.
4809 putmsg                          NEW: STREAMS
4810 putpmsg                         NEW: STREAMS
4811 pututxline                      NEW: Unix98
4812 pwrite                          NEW: Unix98
4813 pwrite64                        NEW: LFS
4814 readdir64                       NEW: LFS
4815 readdir64_r                     NEW: LFS
4816 remquo                          NEW: ISO C 9x
4817 remquof                         NEW: ISO C 9x
4818 remquol                         NEW: ISO C 9x
4819 round                           NEW: ISO C 9x
4820 roundf                          NEW: ISO C 9x
4821 roundl                          NEW: ISO C 9x
4822 rtime                           NEW: GNU ext.
4823 scalbln                         NEW: ISO C 9x
4824 scalblnf                        NEW: ISO C 9x
4825 scalblnl                        NEW: ISO C 9x
4826 scandir64                       NEW: LFS
4827 sendfile                        NEW: kernel
4828 setcontext                      NEW: Unix98
4829 setrlimit64                     NEW: LFS
4830 setutxent                       NEW: Unix98
4831 sighold                         NEW: Unix98
4832 sigignore                       NEW: Unix98
4833 sigqueue                        NEW: POSIX.1b
4834 sigrelse                        NEW: Unix98
4835 sigset                          NEW: POSIX.1b
4836 sigtimedwait                    NEW: POSIX.1b
4837 sigwaitinfo                     NEW: POSIX.1b
4838 sincos                          NEW: GNU ext.
4839 sincosf                         NEW: GNU ext.
4840 sincosl                         NEW: GNU ext.
4841 statfs64                        NEW: LFS
4842 statvfs                         NEW: Unix98
4843 statvfs64                       NEW: LFS
4844 strcasestr                      NEW: GNU ext.
4845 strtoimax                       NEW: ISO C 9x
4846 strtoumax                       NEW: ISO C 9x
4847 strverscmp                      NEW: GNU ext.
4848 svcauthdes_stats                NEW: Secure RPC
4849 svcunix_create                  NEW: sunrpc etx
4850 svcunixfd_create                NEW: sunrpc ext
4851 swapcontext                     NEW: Unix98
4852 tcgetsid                        NEW: Unix98 PTY
4853 tdestroy                        NEW: GNU ext.
4854 tgamma                          NEW: ISO C 9x
4855 tgammaf                         NEW: ISO C 9x
4856 tgammal                         NEW: ISO C 9x
4857 tmpfile64                       NEW: LFS
4858 trunc                           NEW: ISO C 9x
4859 truncate64                      NEW: LFS
4860 truncf                          NEW: ISO C 9x
4861 truncl                          NEW: ISO C 9x
4862 umount2                         NEW: kernel
4863 unlockpt                        NEW: Unix98 PTY
4864 updwtmpx                        NEW: Unix98
4865 user2netname                    NEW: Secure RPC
4866 utmpxname                       NEW: Unix98
4867 versionsort                     NEW: GNU ext.
4868 versionsort64                   NEW: GNU ext.
4869 waitid                          NEW: Unix98
4870 wcscasecmp                      NEW: GNU ext.
4871 wcsncasecmp                     NEW: GNU ext.
4872 wcsnlen                         NEW: GNU ext.
4873 wcstoimax                       NEW: ISO C 9x
4874 wcstoll                         NEW: ISO C 9x
4875 wcstoull                        NEW: ISO C 9x
4876 wcstoumax                       NEW: ISO C 9x
4877 wcswcs                          NEW: Unix98
4878 wordexp                         NEW: POSIX.2
4879 wordfree                        NEW: POSIX.2
4880 write_profiling                 REMOVED
4881 xdecrypt                        NEW: Secure RPC
4882 xdr_authdes_cred                NEW: Secure RPC
4883 xdr_authdes_verf                NEW: Secure RPC
4884 xdr_cryptkeyarg                 NEW: Secure RPC
4885 xdr_cryptkeyarg2                NEW: Secure RPC
4886 xdr_cryptkeyres                 NEW: Secure RPC
4887 xdr_getcredres                  NEW: Secure RPC
4888 xdr_key_netstarg                NEW: Secure RPC
4889 xdr_key_netstres                NEW: Secure RPC
4890 xdr_keybuf                      NEW: Secure RPC
4891 xdr_keystatus                   NEW: Secure RPC
4892 xdr_netnamestr                  NEW: Secure RPC
4893 xdr_sizeof                      NEW: Secure RPC
4894 xdr_unixcred                    NEW: sunrpc ext
4895 xencrypt                        NEW: Secure RPC
4896 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
4897 \f
4898 Version 2.0.6
4899
4900 * more bug fixes
4901
4902 \f
4903 Version 2.0.5
4904
4905 * more bug fixes
4906
4907 * inet_ntoa is thread-safe
4908
4909 * updwtmp is moved from libutil to libc
4910
4911 * rewrite of cbrt function
4912
4913 * update of timezone data
4914 \f
4915 Version 2.0.4
4916
4917 * more bug fixes
4918 \f
4919 Version 2.0.3
4920
4921 * more bug fixes
4922 \f
4923 Version 2.0.2
4924
4925 * more bug fixes
4926
4927 * add atoll function
4928
4929 * fix complex problems in Berkeley DB code
4930
4931 * fix math functions
4932 \f
4933 Version 2.0.1
4934
4935 * fixed lots of header problems (especially Linux/GNU specific)
4936
4937 * dynamic loader preserves all registers
4938
4939 * Roland McGrath provided support for handling of auxiliary objects in
4940   the ELF dynamic loader.
4941
4942 * support for parallel builds is improved
4943 \f
4944 Version 2.0
4945
4946 * GNU extensions are no longer declared by default.  To enable them you
4947   must define the macro `_GNU_SOURCE' in your program or compile with
4948   `-D_GNU_SOURCE'.
4949
4950 * The library has changed from using GNU ld symbol aliases to using weak
4951   symbols where available.  The ELF object file format supports weak
4952   symbols; GNU ld also supports weak symbols in the a.out format.  (There
4953   is also now support for other GNU ld extensions in ELF.  Use the
4954   `--with-elf' option to configure to indicate you have ELF, and
4955   `--with-gnu-ld' if using GNU ld.)  This change resulted in the deletion
4956   of many files which contained only symbol aliases, reducing the size of
4957   the source and the compiled library; many other files were renamed to
4958   less cryptic names previously occupied by the symbol alias files.
4959   There is a new header file <elf.h> for programs which operate on
4960   files in the ELF format.
4961
4962 * Converted to Autoconf version 2, so `configure' has more options.
4963   Run `configure --help' to see the details.
4964
4965 * The library can now be configured to build profiling, highly-optimized
4966   (but undebuggable), and/or shared libraries (ELF with GNU ld only).  The
4967   `--enable-profile', `--enable-omitfp', and `--enable-shared' options to
4968   `configure' enable building these extra libraries.  The shared library is
4969   built by default when using both ELF and GNU ld.  When shared libraries
4970   are enabled, the new library `-ldl' is available for arbitrary run-time
4971   loading of shared objects; its interface is defined in <dlfcn.h>.  The
4972   new header file <link.h> gives access to the internals of the run-time
4973   dynamic linker, `ld.so'.  The shell script `ldd' is similar to the
4974   application of same name on other systems and it provides information
4975   about dynamically linked binaries.
4976
4977 * The C library now provides the run-time support code for profiling
4978   executables compiled with `-pg'.  Programs can control the profiling code
4979   through the interface in <sys/gmon.h>.  The `gmon.out' files written by
4980   the GNU C library can be read only by GNU `gprof' (from GNU binutils);
4981   the support for this file format was contributed by David Mosberger-Tang.
4982
4983 * The math code has been replaced with a math library based on fdlibm from
4984   Sun, and modified by JT Conklin and Ulrich Drepper with i387 support, by
4985   Ian Taylor with `float' functions and by Ulrich Drepper with `long double'
4986   functions.  The math functions now reside in a separate library,  so
4987   programs using them will need to use `-lm' their linking commands.
4988
4989 * John C. Bowman contributed optimized ix87 assembler inline functions.
4990
4991 * Ulrich Drepper has contributed support for an `/etc/nsswitch.conf'
4992   mechanism similar to that found in Solaris 2.  This is now used for the
4993   group, passwd, hosts, networks, services, protocols, rpc, ethers,
4994   shadow, netgroup, publickey, and alias databases.  The `nsswitch.conf'
4995   file controls what services are used for each individual database.  This
4996   works by loading shared libraries with names specified in `nsswitch.conf',
4997   so service modules can be changed or added at any time without even
4998   relinking any program.  Currently there are the file, db, and NIS based
4999   NSS services available.
5000
5001 * The new functions `strtoq' and `strtouq' parse integer values from
5002   strings, like `strtol' and `strtoul', but they return `long long int' and
5003   `unsigned long long int' values, respectively (64-bit quantities).
5004
5005 * The new functions `strtof' and `strtold' parse floating-point values from
5006   strings, like `strtod', but they return `float' and `long double' values,
5007   respectively (on some machines `double' and `long double' are the same).
5008
5009 * Ulrich Drepper has contributed new implementations of the floating-point
5010   printing and reading code used in the `printf' family of functions and
5011   `strtod', `strtof', and `strtold'.  These new functions are perfectly
5012   accurate, and much faster than the old ones.
5013
5014 * The implementation of the POSIX locale model was completely rewritten by
5015   Ulrich Drepper.  This includes the new programs `localedef' and `locale'
5016   to compile the POSIX locale definition.
5017
5018 * The former dummy implementations of the strcoll and strxfrm function are
5019   now replaced by fully functional code contributed by Ulrich Drepper.  The
5020   collation information comes from the POSIX locale definitions.
5021
5022 * The new header <langinfo.h> defines an interface for accessing
5023   various locale-dependent data (using the locale chosen with `setlocale').
5024
5025 * Ulrich Drepper has contributed a new suite of functions for operation on
5026   wide-character and multibyte-character strings, in <wchar.h>;
5027   and classification and case conversion of wide characters, in <wctype.h>.
5028   These new functions are conforming to the ISO C, Amendement 1 specification.
5029
5030 * There is now a second implementation of the standard I/O library available.
5031   It comes from GNU libg++ as was written by Per Bothner, heavily modified
5032   by Hongjiu Lu and made thread safe by Ulrich Drepper.
5033
5034 * You can now use positional parameter specifications in format strings
5035   for the `printf' and `scanf' families of functions.  For example,
5036   `printf ("Number %2$d, Mr %1$s\n", "Jones", 6);'' prints
5037   ``Number 6, Mr Jones''.  This is mainly useful when providing different
5038   format strings for different languages, whose grammars may dictate
5039   different orderings of the values being printed.  To support this
5040   feature, the interface for `register_printf_handler' has changed; see
5041   the header file <printf.h> for details.
5042
5043 * The `printf' and `scanf' families of functions now understand a new
5044   formatting flag for numeric conversions: the ' flag (e.g. %'d or %'f) says
5045   to group numbers as indicated by the locale; for `scanf' and friends, this
5046   says to accept as valid only a number with all the proper grouping
5047   separators in the right places.  In the default "C" locale, numbers are
5048   not grouped; but locales for specific countries will define the usual
5049   conventions (i.e. separate thousands with `,' in the US locale).
5050
5051 * The pgrp functions have been regularized, slightly incompatibly but much
5052   less confusingly.  The core functions are now `getpgid' and `setpgid',
5053   which take arguments for the PID to operate on; the POSIX.1 `getpgrp' (no
5054   argument) and BSD `setpgrp' (identical to `setpgid') functions are
5055   provided for compatibility.  There is no longer an incompatible `getpgrp'
5056   with an argument declared under _BSD_SOURCE; no BSD code uses it.
5057
5058 * The new header file <fts.h> and suite of functions simplify programs that
5059   operate on directory trees.  This code comes from 4.4 BSD.
5060
5061 * The resolver code has been updated from the BIND 4.9.5-P1 release.
5062   Parts of the code were heavily modified by Ulrich Drepper to fit in the
5063   NSS scheme used in glibc.
5064
5065 * There is a new malloc debugging hook `__memalign_hook'.
5066
5067 * There are new typedefs `ushort' for `unsigned short int' and `uint' for
5068   `unsigned int' in <sys/types.h>.  These are for compatibility only and
5069   their use is discouraged.
5070
5071 * The `-lmcheck' library to enable standard malloc debugging hooks is now
5072   done differently, so that it works even without GNU ld.
5073
5074 * New function `euidaccess' checks allowed access to a file like `access',
5075   but using the effective IDs instead of the real IDs.
5076
5077 * The time zone data files have been updated for the latest and greatest
5078   local time conventions of the countries of the world.
5079
5080 * The new function `dirfd' extracts the file descriptor used by a DIR stream;
5081   see <dirent.h>.
5082
5083 * The new functions `ecvt', `fcvt', and `gcvt' provide an obsolete interface
5084   for formatting floating-point numbers.  They are provided only for
5085   compatibility; new programs should use `sprintf' instead.  There are
5086   also equivalent function for the `long double' floating-point type and
5087   all functions also exist in a reentrant form.
5088
5089 * The new auxiliary library `-lutil' from 4.4 BSD contains various
5090   functions for maintaining the login-record files (primarily of use to
5091   system programs such as `login'), and convenient functions for
5092   allocating and initializing a pseudo-terminal (pty) device.
5093
5094 * Ulrich Drepper has contributed new support for System V style
5095   shared memory and IPC on systems that support it.
5096
5097 * Ulrich Drepper has contributed several miscellaneous new functions found
5098   in System V: The `hsearch' family of functions provide an effective
5099   implementation of hash tables; `a64l' and `l64a' provide a very simple
5100   binary to ASCII mapping; `drand48' and friends provide a 48-bit random
5101   number generator.
5102
5103 * Ulrich Drepper has contributed new reentrant counterparts for the
5104   `random' and `hsearch' families of functions; `random_r', `hsearch_r', etc.
5105
5106 * Ulrich Drepper has contributed new, highly-optimized versions of several
5107   string functions for the i486/Pentium family of processors.
5108
5109 * Ulrich Drepper has updated the Linux-specific code, based largely
5110   on work done in Hongjiu Lu's version of GNU libc for Linux.
5111   The GNU library now supports Linux versions 2.0.10 and later,
5112   using the ELF object file format (i[3456]86-*-linux).
5113
5114 * Andreas Schwab has ported the C library to Linux/m68k (m68k-*-linux).
5115
5116 * David Mosberger-Tang and Richard Henderson have ported the C library
5117   to Linux/Alpha (alpha-*-linux).  Richard Henderson contributed the
5118   dynamic linking support for ELF/Alpha.
5119
5120 * Richard Henderson contributed several Alpha optimized assembler function
5121   for arithmetic and string handling.
5122
5123 * Ulrich Drepper has contributed a new set of message catalog functions to
5124   support multiple languages using the <libintl.h> interface, for use with
5125   his new package GNU gettext.  Translation volunteers have contributed
5126   catalogs of the library's messages in Spanish, German, and Korean.
5127
5128 * For compatibility with XPG4, Ulrich Drepper has contributed the `gencat'
5129   program and the `catgets' function for reading the catalog files it
5130   creates.  (The <libintl.h> interface is preferred; we include the
5131   <nl_types.h> interface using `catgets' only for source compatibility with
5132   programs already written to use it.)
5133
5134 * New header file <values.h> gives SVID-compatible names for <limits.h>
5135   constants.
5136
5137 * Various new macros, declarations, and small header files for compatibility
5138   with 4.4 BSD.
5139
5140 * New function `group_member' is a convenient way to check if a process has
5141   a given effective group ID.
5142
5143 * When using GCC 2.7 and later, the socket functions are now declared in a
5144   special way so that passing an argument of type `struct sockaddr_in *',
5145   `struct sockaddr_ns *', or `struct sockaddr_un *' instead of the generic
5146   `struct sockaddr *' type, does not generate a type-clash warning.
5147
5148 * New function `error' declared in header file <error.h> is a convenient
5149   function for printing error messages and optionally exiting; this is the
5150   canonical function used in GNU programs.  The new functions `err', `warn',
5151   and friends in header file <err.h> are the canonical 4.4 BSD interface for
5152   doing the same thing.
5153
5154 * The <glob.h> interface has several new flags from 4.4 BSD that extend the
5155   POSIX.2 `glob' function to do ~ and {...} expansion.
5156
5157 * New function `unsetenv' complements `setenv' for compatibility with 4.4 BSD.
5158   `clearenv' which is used in POSIX.9 is also available.
5159
5160 * New function `getsid' returns session ID number on systems that support it.
5161
5162 * We have incorporated the 4.4 BSD `db' library (version 1.85).  New header
5163   files <db.h> and <mpool.h> provide a rich set of functions for several
5164   types of simple databases stored in memory and in files, and <ndbm.h> is
5165   an old `ndbm'-compatible interface using the `db' functions.  Link with
5166   `-ldb' to get these functions.
5167
5168 * New macro `strdupa' copies a string like `strdup', but uses local stack
5169   space from `alloca' instead of dynamic heap space from `malloc'.
5170
5171 * New function `strnlen' is like `strlen' but searches only a given maximum
5172   number of characters for the null terminator.  `stpncpy', `strndup' and
5173   `strndupa' are similar variants for the `stpcpy', `strdup' and `strdupa'
5174   function.
5175
5176 * New function `statfs' in header <sys/statfs.h>.
5177
5178 * The new <argz.h> and <envz.h> interfaces contributed by Miles Bader
5179   provide convenient functions for operating on blocks of null-terminated
5180   strings.
5181
5182 * A new suite of functions in <utmp.h> handle all the details of reading
5183   and writing the utmp file.
5184
5185 * An implementation of the NIS/YP(tm) based NSS service was contributed by
5186   Thorsten Kukuk.
5187
5188 * Paul Eggert and Ulrich Drepper modified the `strftime' function to be
5189   completely POSIX compliant and also implemented the extended functionality
5190   to handle alternate digit representation and alternate era date formats.
5191
5192 * Ulrich Drepper provided an implementation of the `strptime' function
5193   defined in XPG4.2 which transforms a string into a `struct tm' value.
5194
5195 * Paul Eggert provided the tzselect shell script as part of the timezone
5196   code.  The shell script makes it easy to select the correct timezone
5197   specification.
5198
5199 * The implementation of the malloc family of functions is completely replaced
5200   by a new implementation by Doug Lea with many improvements by Wolfram Gloger.
5201   The implementation uses the mmap function (if available) and it is
5202   optimized for the use in multi threaded programs.
5203
5204 * Ulrich Drepper contributed a MD5 "encryption" for the crypt family of
5205   functions.  This new functionality is usable by specifying a special
5206   salt string and it is compatible with implementation on *BSD systems.
5207
5208 * Lots of functions from the XPG4.2 standard were added by Ulrich Drepper:
5209   `getsubopt' to handle second level command line options, `bsd_signal'
5210   to access BSD style `signal' functionality, the obsolete `regexp' style
5211   expression matcher.
5212
5213 * the `lchown' function is available on system which support this
5214   functionality.
5215
5216 * The implementation of the shadow password handling function was contributed
5217   by Ulrich Drepper.
5218
5219 * David Mosberger-Tang changed the SunRPC implementation to be 64bit safe.
5220
5221 * POSIX.1g support was added.  The <sys/select.h> header is available,
5222   `isfdtype' and `pselect' are implemented.  Craig Metz contributed an
5223   implementation of `getaddrinfo'.
5224 \f
5225 Version 1.09
5226
5227 * For cross-compilation you should now set `BUILD_CC' instead of `HOST_CC'.
5228
5229 * New header file <fstab.h> and new functions `getfsspec', `getfsent' and
5230   friends, for parsing /etc/fstab.  This code comes from 4.4 BSD.
5231
5232 * The new function `daemon' from 4.4 BSD is useful for server programs that
5233   want to put themselves in the background.
5234
5235 * Joel Sherrill has contributed support for several standalone boards that
5236   run without an operating system.
5237
5238 * `printf', `scanf' and friends now accept a `q' type modifier for long
5239   long int as well as `ll'.  Formats using these might be `%qu' or `%lld'.
5240
5241 * All of the code taken from BSD (notably most of the math and networking
5242   routines) has been updated from the BSD 4.4-Lite release.
5243
5244 * The resolver code has been updated from the BIND-4.9.3-BETA9 release.
5245
5246 * The new functions `getdomainname' and `setdomainname' fetch or change the
5247   YP/NIS domain name.  These are system calls which exist on systems which
5248   have YP (aka NIS).
5249
5250 * The time zone data files have been updated for the latest international
5251   conventions.
5252
5253 * The SunRPC programs `portmap' and `rpcinfo' are now installed in
5254   $(sbindir) (usually /usr/local/sbin) instead of $(bindir).
5255 \f
5256 Version 1.08
5257
5258 * The C library now includes support for Sun RPC, from Sun's free
5259   RPCSRC-4.0 distribution.  The `portmap', `rpcinfo', and `rpcgen' programs
5260   are included.  (There is still no support for YP.)
5261
5262 * Tom Quinn has contributed a port of the C library to SGI machines running
5263   Irix 4 (mips-sgi-irix4).
5264
5265 * The new `lockf' function is a simplified interface to the locking
5266   facilities of `fcntl', included for compatibility.
5267
5268 * New time functions `timegm', `timelocal', and `dysize' for compatibility.
5269
5270 * New header file <sys/timeb.h> and new function `ftime' for compatibility.
5271
5272 * New header files <poll.h> and <sys/poll.h> and new function `poll' for
5273   compatibility.
5274
5275 * The error message printed by `assert' for a failed assertion now includes
5276   the name of the program (if using GNU ld) and the name of the calling
5277   function (with versions of GCC that support this).
5278
5279 * The `psignal' function is now declared in <signal.h>, not <stdio.h>.
5280
5281 * The library now includes the <sys/mman.h> header file and memory
5282   management functions `mmap', `munmap', `mprotect', `msync', and
5283   `madvise', on systems that support those facilities.
5284
5285 * The interface for `mcheck' has changed slightly: the function called to
5286   abort the program when an allocation inconsistency is detected now takes
5287   an argument that indicates the type of failure.  The new function
5288   `mprobe' lets you request a consistency check for a particular block at
5289   any time (checks are normally done only when you call `free' or `realloc'
5290   on a block).
5291
5292 * It is now possible to easily cross-compile the C library, building on one
5293   system a library to run on another machine and/or operating system.  All
5294   you need to do is set the variable `HOST_CC' in `configparms' to the
5295   native compiler for programs to run on the machine you are building on (a
5296   few generator programs are used on Unix systems); set `CC' to the
5297   cross-compiler.
5298
5299 * The new function `fexecve' (only implemented on the GNU system) executes
5300   a program file given a file descriptor already open on the file.
5301 \f
5302 Version 1.07
5303
5304 * Brendan Kehoe has contributed most of a port to the DEC Alpha
5305   running OSF/1 (alpha-dec-osf1).  He says it is 75% complete.
5306
5307 * You can set the variable `libprefix' in `configparms' to specify a prefix
5308   to be prepended to installed library files; this makes it easy to install
5309   the GNU C library to be linked as `-lgnuc' or whatever.
5310
5311 * The new `stpncpy' is a cross between `stpcpy' and `strncpy': It
5312   copies a limited number of characters from a string, and returns the
5313   address of the last character written.
5314
5315 * You no longer need to check for whether the installed `stddef.h' is
5316   compatible with the GNU C library.  configure now checks for you.
5317
5318 * You can now define a per-stream `fileno' function to convert the
5319   stream's cookie into an integral file descriptor.
5320
5321 * ``malloc (0)'' no longer returns a null pointer.  Instead, it
5322   allocates zero bytes of storage, and returns a unique pointer which
5323   you can pass to `realloc' or `free'.  The behavior is undefined if
5324   you dereference this pointer.
5325
5326 * The C library now runs on Sony NEWS m68k machines running either
5327   NewsOS 3 or NewsOS 4.
5328
5329 * The new `syscall' function is a system-dependent primitive function
5330   for invoking system calls.  It has the canonical behavior on Unix
5331   systems, including unreliable return values for some calls (such as
5332   `pipe', `fork' and `getppid').
5333
5334 * The error code `EWOULDBLOCK' is now obsolete; it is always defined
5335   to `EAGAIN', which is the preferred name.  On systems whose kernels
5336   use two distinct codes, the C library now translates EWOULDBLOCK to
5337   EAGAIN in every system call function.
5338 \f
5339 Version 1.06
5340
5341 * The GNU C Library Reference Manual is now distributed with the library.
5342   `make dvi' will produce a DVI file of the printed manual.
5343   `make info' will produce Info files that you can read on line using C-h i
5344   in Emacs or the `info' program.
5345   Please send comments on the manual to bug-glibc-manual@gnu.org.
5346
5347 * The library now supports SVR4 on i386s (i386-unknown-sysv4).
5348
5349 * Brendan Kehoe has contributed a port to Sun SPARCs running Solaris 2.
5350
5351 * Jason Merrill has contributed a port to the Sequent Symmetry running
5352   Dynix version 3 (i386-sequent-dynix).
5353
5354 * The library has been ported to i386s running SCO 3.2.4 (also known as SCO
5355   ODT 2.0; i386-unknown-sco3.2.4) or SCO 3.2 (i386-unknown-sco3.2).
5356
5357 * New function `memory_warnings' lets you arrange to get warnings when
5358   malloc is running out of memory to allocate, like Emacs gives you.
5359
5360 * The C library now contains the relocating allocator used in Emacs 19 for
5361   its editing buffers.  This allocator (ralloc) minimizes allocation
5362   overhead and fragmentation by moving allocated regions around whenever it
5363   needs to.  You always refer to a ralloc'd region with a "handle" (a
5364   pointer to a pointer--an object of type `void **').
5365
5366 * There is a new `printf' format: `%m' gives you the string corresponding
5367   to the error code in `errno'.
5368
5369 * In `scanf' formats, you can now use `%as' or `%a[' to do the normal `%s'
5370   or `%[' conversion, but instead of filling in a fixed-sized buffer you
5371   pass, the `a' modifier says to fill in a `char **' you pass with a
5372   malloc'd string.
5373
5374 * The `fnmatch' function supports the new flag bits `FNM_LEADING_DIR' and
5375   `FNM_CASEFOLD'.  `FNM_LEADING_DIR' lets a pattern like `foo*' match a
5376   name like `foo/bar'.  `FNM_CASEFOLD' says to ignore case in matching.
5377
5378 * `mkstemp' is a traditional Unix function to atomically create and open a
5379   uniquely-named temporary file.
5380 \f
5381 Version 1.05
5382
5383 * The standard location for the file that says what the local timezone is
5384   has changed again.  It is now `/usr/local/etc/localtime' (or more
5385   precisely, `${prefix}/etc/localtime') rather than `/etc/localtime'.
5386
5387 * The distribution no longer contains any files with names longer than 14
5388   characters.
5389
5390 * `struct ttyent' has two new flag bits: TTY_TRUSTED and TTY_CONSOLE.
5391   These are set by the new `trusted' and `console' keywords in `/etc/ttys'.
5392
5393 * New functions `ttyslot' and `syslog' from 4.4 BSD.
5394 \f
5395 Version 1.04
5396
5397 * The configuration process has changed quite a bit.  The `configure'
5398   script is now used just like the configuration scripts for other GNU
5399   packages.  The `sysdeps' directory hierarchy is much rearranged.
5400   The file `INSTALL' explains the new scheme in detail.
5401
5402 * The header files no longer need to be processed into ANSI C and
5403   traditional C versions.  There is just one set of files to install, and
5404   it will work with ANSI or old C compilers (including `gcc -traditional').
5405
5406 * Brendan Kehoe and Ian Lance Taylor have ported the library to the
5407   MIPS DECStation running Ultrix 4.
5408
5409 * The Sun 4 startup code (crt0) can now properly load SunOS 4 shared libraries.
5410   Tom Quinn contributed the initial code.  The GNU C library can NOT yet be
5411   made itself into a shared library.
5412
5413 * Yet further improved support for the i386, running 4.3 BSD-like systems
5414   (such as Mach 3 with the Unix single-server), or System V.
5415
5416 * New function `strncasecmp' to do case-insensitive string comparison
5417   with limited length.
5418
5419 * New function `strsep' is a reentrant alternative to `strtok'.
5420
5421 * New functions `scandir' and `alphasort' for searching directories.
5422
5423 * New function `setenv' is a better interface to `putenv'.
5424
5425 * Ian Lance Taylor has contributed an implementation of the SVID `ftw'
5426   function for traversing a directory tree.
5427
5428 * The GNU obstack package is now also part of the C library.
5429   The new function `open_obstack_stream' creates a stdio stream that
5430   writes onto an obstack; `obstack_printf' and `obstack_vprintf' do
5431   formatted output directly to an obstack.
5432
5433 * Miscellaneous new functions: reboot, nice, sigaltstack (4.4 BSD only),
5434   cfmakeraw, getusershell, getpass, swab, getttyent, seteuid, setegid.
5435
5436 * `FNM_FILE_NAME' is another name for `FNM_PATHNAME', used with `fnmatch'.
5437
5438 * The new functions `strfry' and `memfrob' do mysterious and wonderful
5439   things to your strings.
5440
5441 * There are some new test programs: test-fseek, testmb, and testrand.
5442
5443 * Some work has been done to begin porting the library to 4.4 BSD and Linux.
5444   These ports are not finished, but are a good starting place for really
5445   supporting those systems.
5446
5447 * `/etc/localtime' is now the standard location for the file that says what
5448   the local timezone is, rather than `/usr/local/lib/zoneinfo/localtime'.
5449   This follows the general principle that `/etc' is the place for all local
5450   configuration files.
5451
5452 * The C library header files now use `extern "C"' when used by the C++
5453   compiler, so the C library should now work with C++ code.
5454
5455 * The header file <bstring.h> is gone.  <string.h> now declares bcopy,
5456   bcmp, bzero, and ffs.  (Update: nowadays these functions are declared
5457   in <strings.h>.)
5458
5459 * Mike Haertel (of GNU e?grep and malloc fame) has written a new sorting
5460   function which uses the `merge sort' algorithm, and is said to be
5461   significantly faster than the old GNU `qsort' function.  Merge sort is
5462   now the standard `qsort' function.  The new algorithm can require a lot
5463   of temporary storage; so, the old sorting function is called when the
5464   required storage is not available.
5465
5466 * The C library now includes Michael Glad's Ultra Fast Crypt, which
5467   provides the Unix `crypt' function, plus some other entry points.
5468
5469 * The code and header files taken from 4.4 BSD have been updated with the
5470   latest files released from Berkeley.
5471 \f
5472 ----------------------------------------------------------------------
5473 Copyright information:
5474
5475 Copyright (C) 1992-2019 Free Software Foundation, Inc.
5476
5477    Permission is granted to anyone to make or distribute verbatim copies
5478    of this document as received, in any medium, provided that the
5479    copyright notice and this permission notice are preserved,
5480    thus giving the recipient permission to redistribute in turn.
5481
5482    Permission is granted to distribute modified versions
5483    of this document, or of portions of it,
5484    under the above conditions, provided also that they
5485    carry prominent notices stating who last changed them.
5486 \f
5487 Local variables:
5488 version-control: never
5489 fill-column: 76
5490 End: