configure.ac

   1 dnl Process this file with autoconf to produce a configure script.
   2 dnl Note we do not use AC_PREREQ here!  See aclocal.m4 for what we use instead.
   3 AC_INIT([GNU C Library], [(see version.h)], [https://sourceware.org/bugzilla/],
   4   [glibc], [https://www.gnu.org/software/glibc/])
   5 AC_CONFIG_SRCDIR([include/features.h])
   6 AC_CONFIG_HEADERS([config.h])
   7 AC_CONFIG_AUX_DIR([scripts])
   8
   9 ACX_PKGVERSION([GNU libc])
  10 ACX_BUGURL([https://www.gnu.org/software/libc/bugs.html])
  11 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
  12                    [Package description])
  13 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
  14                    [Bug reporting address])
  15
  16 # Glibc should not depend on any header files
  17 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
  18   [m4_divert_text([DEFAULTS],
  19     [ac_includes_default='/* none */'])])
  20
  21 # We require GCC, and by default use its preprocessor.  Override AC_PROG_CPP
  22 # here to work around the Autoconf issue discussed in
  23 # <https://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
  24 AC_DEFUN([AC_PROG_CPP],
  25 [AC_REQUIRE([AC_PROG_CC])dnl
  26 AC_ARG_VAR([CPP],      [C preprocessor])dnl
  27 _AC_ARG_VAR_CPPFLAGS()dnl
  28 # On Suns, sometimes $CPP names a directory.
  29 if test -n "$CPP" && test -d "$CPP"; then
  30   CPP=
  31 fi
  32 if test -z "$CPP"; then
  33   CPP="$CC -E"
  34 fi
  35 AC_SUBST(CPP)dnl
  36 ])# AC_PROG_CPP
  37
  38 # We require GCC.  Override _AC_PROG_CC_C89 here to work around the Autoconf
  39 # issue discussed in
  40 # <https://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
  41 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
  42
  43 dnl This is here so we can set $subdirs directly based on configure fragments.
  44 AC_CONFIG_SUBDIRS()
  45
  46 AC_CANONICAL_HOST
  47
  48 AC_PROG_CC
  49 if test $host != $build; then
  50   AC_CHECK_PROGS(BUILD_CC, gcc cc)
  51 fi
  52 AC_SUBST(cross_compiling)
  53 AC_PROG_CPP
  54 AC_CHECK_TOOL(READELF, readelf, false)
  55
  56 # We need the C++ compiler only for testing.
  57 AC_PROG_CXX
  58 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
  59 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
  60 AC_LANG_PUSH([C++])
  61 # Default, dynamic case.
  62 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  63                [libc_cv_cxx_link_ok=yes],
  64                [libc_cv_cxx_link_ok=no])
  65 # Static case.
  66 old_LDFLAGS="$LDFLAGS"
  67 LDFLAGS="$LDFLAGS -static"
  68 AC_LINK_IFELSE([AC_LANG_SOURCE([
  69 #include <iostream>
  70
  71 int
  72 main()
  73 {
  74   std::cout << "Hello, world!";
  75   return 0;
  76 }
  77 ])],
  78                [],
  79                [libc_cv_cxx_link_ok=no])
  80 LDFLAGS="$old_LDFLAGS"
  81 AC_LANG_POP([C++])])
  82 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
  83
  84 if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
  85   AC_MSG_ERROR([you must configure in a separate build directory])
  86 fi
  87
  88 # This will get text that should go into config.make.
  89 config_vars=
  90
  91 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
  92 AC_ARG_WITH([gd],
  93             AS_HELP_STRING([--with-gd=DIR],
  94                            [find libgd include dir and library with prefix DIR]),
  95             [dnl
  96 case "$with_gd" in
  97 yes|''|no) ;;
  98 *) libgd_include="-I$withval/include"
  99    libgd_ldflags="-L$withval/lib" ;;
 100 esac
 101 ])
 102 AC_ARG_WITH([gd-include],
 103             AS_HELP_STRING([--with-gd-include=DIR],
 104                            [find libgd include files in DIR]),
 105             [dnl
 106 case "$with_gd_include" in
 107 ''|no) ;;
 108 *) libgd_include="-I$withval" ;;
 109 esac
 110 ])
 111 AC_ARG_WITH([gd-lib],
 112             AS_HELP_STRING([--with-gd-lib=DIR],
 113                            [find libgd library files in DIR]),
 114             [dnl
 115 case "$with_gd_lib" in
 116 ''|no) ;;
 117 *) libgd_ldflags="-L$withval" ;;
 118 esac
 119 ])
 120
 121 if test -n "$libgd_include"; then
 122   config_vars="$config_vars
 123 CFLAGS-memusagestat.c = $libgd_include"
 124 fi
 125 if test -n "$libgd_ldflags"; then
 126   config_vars="$config_vars
 127 libgd-LDFLAGS = $libgd_ldflags"
 128 fi
 129
 130 dnl Arguments to specify presence of other packages/features.
 131 AC_ARG_WITH([binutils],
 132             AS_HELP_STRING([--with-binutils=PATH],
 133                            [specify location of binutils (as and ld)]),
 134             [path_binutils=$withval],
 135             [path_binutils=''])
 136 AC_ARG_WITH([selinux],
 137             AS_HELP_STRING([--with-selinux],
 138                            [if building with SELinux support]),
 139             [with_selinux=$withval],
 140             [with_selinux=auto])
 141
 142 AC_ARG_WITH([headers],
 143             AS_HELP_STRING([--with-headers=PATH],
 144                            [location of system headers to use
 145                             (for example /usr/src/linux/include)
 146                             @<:@default=compiler default@:>@]),
 147             [sysheaders=$withval],
 148             [sysheaders=''])
 149 AC_SUBST(sysheaders)
 150
 151 AC_SUBST(use_default_link)
 152 AC_ARG_WITH([default-link],
 153             AS_HELP_STRING([--with-default-link],
 154                            [do not use explicit linker scripts]),
 155             [use_default_link=$withval],
 156             [use_default_link=default])
 157
 158 dnl Additional build flags injection.
 159 AC_ARG_WITH([nonshared-cflags],
 160             AS_HELP_STRING([--with-nonshared-cflags=CFLAGS],
 161                            [build nonshared libraries with additional CFLAGS]),
 162             [extra_nonshared_cflags=$withval],
 163             [extra_nonshared_cflags=])
 164 AC_SUBST(extra_nonshared_cflags)
 165
 166 AC_ARG_ENABLE([sanity-checks],
 167               AS_HELP_STRING([--disable-sanity-checks],
 168                              [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
 169               [enable_sanity=$enableval],
 170               [enable_sanity=yes])
 171
 172 AC_ARG_ENABLE([shared],
 173               AS_HELP_STRING([--enable-shared],
 174                              [build shared library @<:@default=yes if GNU ld@:>@]),
 175               [shared=$enableval],
 176               [shared=yes])
 177 AC_ARG_ENABLE([profile],
 178               AS_HELP_STRING([--enable-profile],
 179                              [build profiled library @<:@default=no@:>@]),
 180               [profile=$enableval],
 181               [profile=no])
 182 AC_ARG_ENABLE([static-pie],
 183               AS_HELP_STRING([--enable-static-pie],
 184                              [enable static PIE support and use it in the testsuite @<:@default=no@:>@]),
 185               [static_pie=$enableval],
 186               [static_pie=no])
 187 AC_ARG_ENABLE([timezone-tools],
 188               AS_HELP_STRING([--disable-timezone-tools],
 189                              [do not install timezone tools @<:@default=install@:>@]),
 190               [enable_timezone_tools=$enableval],
 191               [enable_timezone_tools=yes])
 192 AC_SUBST(enable_timezone_tools)
 193
 194 AC_ARG_ENABLE([hardcoded-path-in-tests],
 195               AS_HELP_STRING([--enable-hardcoded-path-in-tests],
 196                              [hardcode newly built glibc path in tests @<:@default=no@:>@]),
 197               [hardcoded_path_in_tests=$enableval],
 198               [hardcoded_path_in_tests=no])
 199 AC_SUBST(hardcoded_path_in_tests)
 200
 201 AC_ARG_ENABLE([hidden-plt],
 202               AS_HELP_STRING([--disable-hidden-plt],
 203                              [do not hide internal function calls to avoid PLT]),
 204               [hidden=$enableval],
 205               [hidden=yes])
 206 if test "x$hidden" = xno; then
 207   AC_DEFINE(NO_HIDDEN)
 208 fi
 209
 210 AC_ARG_ENABLE([bind-now],
 211               AS_HELP_STRING([--enable-bind-now],
 212                              [disable lazy relocations in DSOs]),
 213               [bindnow=$enableval],
 214               [bindnow=no])
 215 AC_SUBST(bindnow)
 216 if test "x$bindnow" = xyes; then
 217   AC_DEFINE(BIND_NOW)
 218 fi
 219
 220 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
 221 dnl -fstack-protector-strong.
 222 AC_ARG_ENABLE([stack-protector],
 223               AS_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
 224                              [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
 225               [enable_stack_protector=$enableval],
 226               [enable_stack_protector=no])
 227 case "$enable_stack_protector" in
 228 all|yes|no|strong) ;;
 229 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
 230 esac
 231
 232 dnl On some platforms we cannot use dynamic loading.  We must provide
 233 dnl static NSS modules.
 234 AC_ARG_ENABLE([static-nss],
 235               AS_HELP_STRING([--enable-static-nss],
 236                              [build static NSS modules @<:@default=no@:>@]),
 237               [static_nss=$enableval],
 238               [static_nss=no])
 239 dnl Enable static NSS also if we build no shared objects.
 240 if test x"$static_nss" = xyes || test x"$shared" = xno; then
 241   static_nss=yes
 242   AC_DEFINE(DO_STATIC_NSS)
 243 fi
 244
 245 AC_ARG_ENABLE([force-install],
 246               AS_HELP_STRING([--disable-force-install],
 247                              [don't force installation of files from this package, even if they are older than the installed files]),
 248               [force_install=$enableval],
 249               [force_install=yes])
 250 AC_SUBST(force_install)
 251
 252 AC_ARG_ENABLE([maintainer-mode],
 253               AS_HELP_STRING([--enable-maintainer-mode],
 254                              [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
 255               [maintainer=$enableval],
 256               [maintainer=no])
 257
 258 dnl On some platforms we allow dropping compatibility with all kernel
 259 dnl versions.
 260 AC_ARG_ENABLE([kernel],
 261               AS_HELP_STRING([--enable-kernel=VERSION],
 262                              [compile for compatibility with kernel not older than VERSION]),
 263               [minimum_kernel=$enableval],
 264               [])
 265 dnl Prevent unreasonable values.
 266 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
 267   # Better nothing than this.
 268   minimum_kernel=""
 269 else
 270   if test "$minimum_kernel" = current; then
 271     minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
 272   fi
 273 fi
 274
 275 dnl For the development we sometimes want gcc to issue even more warnings.
 276 dnl This is not the default since many of the extra warnings are not
 277 dnl appropriate.
 278 AC_ARG_ENABLE([all-warnings],
 279               AS_HELP_STRING([--enable-all-warnings],
 280                              [enable all useful warnings gcc can issue]),
 281               [all_warnings=$enableval],
 282               [])
 283 AC_SUBST(all_warnings)
 284
 285 AC_ARG_ENABLE([werror],
 286               AS_HELP_STRING([--disable-werror],
 287                              [do not build with -Werror]),
 288               [enable_werror=$enableval],
 289               [enable_werror=yes])
 290 AC_SUBST(enable_werror)
 291
 292 AC_ARG_ENABLE([multi-arch],
 293               AS_HELP_STRING([--enable-multi-arch],
 294                              [enable single DSO with optimizations for multiple architectures]),
 295               [multi_arch=$enableval],
 296               [multi_arch=default])
 297
 298 AC_ARG_ENABLE([experimental-malloc],
 299               AS_HELP_STRING([--disable-experimental-malloc],
 300                              [disable experimental malloc features]),
 301               [experimental_malloc=$enableval],
 302               [experimental_malloc=yes])
 303 AC_SUBST(experimental_malloc)
 304
 305 AC_ARG_ENABLE([memory-tagging],
 306               AS_HELP_STRING([--enable-memory-tagging],
 307                              [enable memory tagging if supported by the architecture @<:@default=no@:>@]),
 308               [memory_tagging=$enableval],
 309               [memory_tagging=no])
 310 if test "$memory_tagging" = yes; then
 311   # Only enable this on architectures that support it.
 312   case $host_cpu in
 313     aarch64)
 314       AC_DEFINE(USE_MTAG)
 315       ;;
 316   esac
 317 fi
 318 AC_SUBST(memory_tagging)
 319
 320 AC_ARG_ENABLE([crypt],
 321               AS_HELP_STRING([--disable-crypt],
 322                              [do not build nor install the passphrase hashing library, libcrypt]),
 323               [build_crypt=$enableval],
 324               [build_crypt=yes])
 325 AC_SUBST(build_crypt)
 326
 327 AC_ARG_ENABLE([nss-crypt],
 328               AS_HELP_STRING([--enable-nss-crypt],
 329                              [enable libcrypt to use nss]),
 330               [nss_crypt=$enableval],
 331               [nss_crypt=no])
 332 if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
 333   AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
 334   nss_crypt=no
 335 fi
 336 if test x$nss_crypt = xyes; then
 337   nss_includes=-I$(nss-config --includedir 2>/dev/null)
 338   if test $? -ne 0; then
 339     AC_MSG_ERROR([cannot find include directory with nss-config])
 340   fi
 341   nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
 342   if test $? -ne 0; then
 343     AC_MSG_ERROR([cannot find include directory with nspr-config])
 344   fi
 345   old_CFLAGS="$CFLAGS"
 346   CFLAGS="$CFLAGS $nss_includes $nspr_includes"
 347   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 348 #include <hasht.h>
 349 #include <nsslowhash.h>
 350 void f (void) { NSSLOW_Init (); }])],
 351              libc_cv_nss_crypt=yes,
 352              AC_MSG_ERROR([
 353 cannot find NSS headers with lowlevel hash function interfaces]))
 354   old_LIBS="$LIBS"
 355   old_LDFLAGS="$LDFLAGS"
 356   LIBS="$LIBS -lfreebl3"
 357   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 358 #include <hasht.h>
 359 #include <nsslowhash.h>],
 360                                   [NSSLOW_Init();])],
 361                  libc_cv_nss_crypt=yes,
 362                  AC_MSG_ERROR([
 363 cannot link program using lowlevel NSS hash functions]))
 364   # Check to see if there is a static NSS cryptographic library.
 365   # If there isn't then we can't link anything with libcrypt.a,
 366   # and that might mean disabling some static tests.
 367   LDFLAGS="$LDFLAGS -static"
 368   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 369 #include <hasht.h>
 370 #include <nsslowhash.h>],
 371                                   [NSSLOW_Init();])],
 372                  libc_cv_static_nss_crypt=yes,
 373                  libc_cv_static_nss_crypt=no)
 374   LDFLAGS="$old_LDFLAGS"
 375   CFLAGS="$old_CFLAGS"
 376   LIBS="$old_LIBS"
 377 else
 378   libc_cv_nss_crypt=no
 379   libc_cv_static_nss_crypt=no
 380 fi
 381 AC_SUBST(libc_cv_nss_crypt)
 382 AC_SUBST(libc_cv_static_nss_crypt)
 383
 384
 385 AC_ARG_ENABLE([systemtap],
 386               [AS_HELP_STRING([--enable-systemtap],
 387                [enable systemtap static probe points @<:@default=no@:>@])],
 388               [systemtap=$enableval],
 389               [systemtap=no])
 390 if test "x$systemtap" != xno; then
 391   AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
 392   old_CFLAGS="$CFLAGS"
 393   CFLAGS="-std=gnu11 $CFLAGS"
 394   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
 395 void foo (int i, void *p)
 396 {
 397   asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
 398        :: STAP_PROBE_ASM_OPERANDS (2, i, p));
 399 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
 400   CFLAGS="$old_CFLAGS"])
 401   if test $libc_cv_sdt = yes; then
 402     AC_DEFINE([USE_STAP_PROBE])
 403   elif test "x$systemtap" != xauto; then
 404     AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
 405   fi
 406 fi
 407
 408 AC_ARG_ENABLE([build-nscd],
 409               [AS_HELP_STRING([--disable-build-nscd],
 410                [disable building and installing the nscd daemon])],
 411               [build_nscd=$enableval],
 412               [build_nscd=default])
 413 AC_SUBST(build_nscd)
 414
 415 # Note the use of $use_nscd is near the bottom of the file.
 416 AC_ARG_ENABLE([nscd],
 417               [AS_HELP_STRING([--disable-nscd],
 418                [library functions will not contact the nscd daemon])],
 419               [use_nscd=$enableval],
 420               [use_nscd=yes])
 421
 422 AC_ARG_ENABLE([pt_chown],
 423               [AS_HELP_STRING([--enable-pt_chown],
 424                [Enable building and installing pt_chown])],
 425               [build_pt_chown=$enableval],
 426               [build_pt_chown=no])
 427 AC_SUBST(build_pt_chown)
 428 if test "$build_pt_chown" = yes; then
 429   AC_DEFINE(HAVE_PT_CHOWN)
 430 fi
 431
 432 AC_ARG_ENABLE([tunables],
 433               [AS_HELP_STRING([--enable-tunables],
 434                [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
 435               [have_tunables=$enableval],
 436               [have_tunables=yes])
 437 AC_SUBST(have_tunables)
 438 if test "$have_tunables" = yes; then
 439   AC_DEFINE(HAVE_TUNABLES)
 440 fi
 441
 442 # The abi-tags file uses a fairly simplistic model for name recognition that
 443 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
 444 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
 445 # This doesn't get used much beyond that, so it's fairly safe.
 446 case "$host_os" in
 447 linux*)
 448   ;;
 449 gnu*)
 450   host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
 451   ;;
 452 esac
 453
 454 AC_ARG_ENABLE([mathvec],
 455               [AS_HELP_STRING([--enable-mathvec],
 456               [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
 457               [build_mathvec=$enableval],
 458               [build_mathvec=notset])
 459
 460 AC_TRY_COMPILE([], [
 461 #ifndef __CET__
 462 # error no CET compiler support
 463 #endif],
 464                [libc_cv_compiler_default_cet=yes],
 465                [libc_cv_compiler_default_cet=no])
 466
 467 AC_ARG_ENABLE([cet],
 468               AS_HELP_STRING([--enable-cet],
 469                              [enable Intel Control-flow Enforcement Technology (CET), x86 only]),
 470               [enable_cet=$enableval],
 471               [enable_cet=$libc_cv_compiler_default_cet])
 472
 473 # We keep the original values in `$config_*' and never modify them, so we
 474 # can write them unchanged into config.make.  Everything else uses
 475 # $machine, $vendor, and $os, and changes them whenever convenient.
 476 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
 477
 478 # Don't allow vendor == "unknown"
 479 test "$config_vendor" = unknown && config_vendor=
 480 config_os="`echo $config_os | sed 's/^unknown-//'`"
 481
 482 # Some configurations imply other options.
 483 elf=yes
 484
 485 # The configure fragment of a port can modify these to supplement
 486 # or override the table in the case statement below.  No fragment should
 487 # ever change the config_* variables, however.
 488 machine=$config_machine
 489 vendor=$config_vendor
 490 os=$config_os
 491 base_os=''
 492
 493 submachine=
 494 AC_ARG_WITH([cpu],
 495             AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
 496             [dnl
 497   case "$withval" in
 498   yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
 499   no) ;;
 500   *) submachine="$withval" ;;
 501   esac
 502 ])
 503
 504 # An preconfigure script can set this when it wants to disable the sanity
 505 # check below.
 506 libc_config_ok=no
 507
 508 # A preconfigure script for a system that may or may not use fpu
 509 # sysdeps directories sets this to a preprocessor conditional for
 510 # whether to use such directories.
 511 with_fp_cond=1
 512
 513 dnl Let sysdeps/*/preconfigure act here.
 514 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 515
 516
 517 ###
 518 ### By using the undocumented --enable-hacker-mode option for configure
 519 ### one can skip this test to make the configuration not fail for unsupported
 520 ### platforms.
 521 ###
 522 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
 523   case "$machine-$host_os" in
 524   *-linux* | *-gnu*)
 525     ;;
 526   *)
 527     AC_MSG_ERROR([
 528 *** The GNU C library is currently unavailable for this platform.
 529 *** If you are interested in seeing glibc on this platform visit
 530 *** the "How to submit a new port" in the wiki:
 531 ***   https://sourceware.org/glibc/wiki/#Development
 532 *** and join the community!])
 533     ;;
 534   esac
 535 fi
 536
 537 # Set base_machine if not set by a preconfigure fragment.
 538 test -n "$base_machine" || base_machine=$machine
 539 AC_SUBST(base_machine)
 540
 541 # Determine whether to use fpu or nofpu sysdeps directories.
 542 AC_CACHE_CHECK([for use of fpu sysdeps directories],
 543                libc_cv_with_fp, [dnl
 544 cat > conftest.c <<EOF
 545 #if $with_fp_cond
 546 int dummy;
 547 #else
 548 # error "no hardware floating point"
 549 #endif
 550 EOF
 551 libc_cv_with_fp=no
 552 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
 553    1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
 554   libc_cv_with_fp=yes
 555 fi
 556 rm -f conftest*])
 557 AC_SUBST(libc_cv_with_fp)
 558
 559 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
 560 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
 561                    [libc_cv_ssp=yes],
 562                    [libc_cv_ssp=no])
 563 ])
 564
 565 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
 566 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
 567                    [libc_cv_ssp_strong=yes],
 568                    [libc_cv_ssp_strong=no])
 569 ])
 570
 571 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
 572 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
 573                    [libc_cv_ssp_all=yes],
 574                    [libc_cv_ssp_all=no])
 575 ])
 576
 577 stack_protector=
 578 no_stack_protector=
 579 if test "$libc_cv_ssp" = yes; then
 580   no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
 581   AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
 582 fi
 583
 584 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
 585   stack_protector="-fstack-protector"
 586   AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
 587 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
 588   stack_protector="-fstack-protector-all"
 589   AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
 590 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
 591   stack_protector="-fstack-protector-strong"
 592   AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
 593 else
 594   stack_protector="-fno-stack-protector"
 595   AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
 596 fi
 597 AC_SUBST(libc_cv_ssp)
 598 AC_SUBST(stack_protector)
 599 AC_SUBST(no_stack_protector)
 600
 601 if test -n "$stack_protector"; then
 602   dnl Don't run configure tests with stack-protection on, to avoid problems with
 603   dnl bootstrapping.
 604   no_ssp=-fno-stack-protector
 605 else
 606   no_ssp=
 607
 608   if test "$enable_stack_protector" != no; then
 609     AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
 610   fi
 611 fi
 612
 613 # For the multi-arch option we need support in the assembler & linker.
 614 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
 615                libc_cv_ld_gnu_indirect_function, [dnl
 616 cat > conftest.S <<EOF
 617 .type foo,%gnu_indirect_function
 618 foo:
 619 .globl _start
 620 _start:
 621 .globl __start
 622 __start:
 623 .data
 624 #ifdef _LP64
 625 .quad foo
 626 #else
 627 .long foo
 628 #endif
 629 EOF
 630 libc_cv_ld_gnu_indirect_function=no
 631 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
 632             -nostartfiles -nostdlib $no_ssp \
 633             -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
 634   # Do a link to see if the backend supports IFUNC relocs.
 635   $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
 636   LC_ALL=C $READELF -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && {
 637     libc_cv_ld_gnu_indirect_function=yes
 638   }
 639 fi
 640 rm -f conftest*])
 641
 642 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
 643 AC_CACHE_CHECK([for gcc attribute ifunc support],
 644                libc_cv_gcc_indirect_function, [dnl
 645 cat > conftest.c <<EOF
 646 extern int func (int);
 647 int used_func (int a)
 648 {
 649   return a;
 650 }
 651 static void *resolver ()
 652 {
 653   return &used_func;
 654 }
 655 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
 656 EOF
 657 libc_cv_gcc_indirect_function=no
 658 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
 659    2>&AS_MESSAGE_LOG_FD ; then
 660   if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
 661     libc_cv_gcc_indirect_function=yes
 662   fi
 663 fi
 664 rm -f conftest*])
 665
 666 # Check if linker supports textrel relocation with ifunc (used on elf/tests).
 667 # Note that it relies on libc_cv_ld_gnu_indirect_function test above.
 668 AC_CACHE_CHECK([whether the linker supports textrels along with ifunc],
 669                libc_cv_textrel_ifunc, [dnl
 670 cat > conftest.S <<EOF
 671 .type foo,%gnu_indirect_function
 672 foo:
 673 .globl _start
 674 _start:
 675 .globl __start
 676 __start:
 677 .data
 678 #ifdef _LP64
 679 .quad foo
 680 #else
 681 .long foo
 682 #endif
 683 .text
 684 .globl address
 685 address:
 686 #ifdef _LP64
 687 .quad address
 688 #else
 689 .long address
 690 #endif
 691 EOF
 692 libc_cv_textrel_ifunc=no
 693 if test $libc_cv_ld_gnu_indirect_function = yes; then
 694    if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp -pie -o conftest conftest.S); then
 695      libc_cv_textrel_ifunc=yes
 696    fi
 697 fi
 698 rm -f conftest*])
 699 AC_SUBST(libc_cv_textrel_ifunc)
 700
 701 # Check if CC supports attribute retain as it is used in attribute_used_retain macro.
 702 AC_CACHE_CHECK([for GNU attribute retain support],
 703                libc_cv_gnu_retain, [dnl
 704 cat > conftest.c <<EOF
 705 static int var  __attribute__ ((used, retain, section ("__libc_atexit")));
 706 EOF
 707 libc_cv_gnu_retain=no
 708 if ${CC-cc} -Werror -c conftest.c -o /dev/null 1>&AS_MESSAGE_LOG_FD \
 709    2>&AS_MESSAGE_LOG_FD ; then
 710   libc_cv_gnu_retain=yes
 711 fi
 712 rm -f conftest*])
 713 if test $libc_cv_gnu_retain = yes; then
 714   AC_DEFINE(HAVE_GNU_RETAIN)
 715 fi
 716 LIBC_CONFIG_VAR([have-gnu-retain], [$libc_cv_gnu_retain])
 717
 718 # Check if gcc warns about alias for function with incompatible types.
 719 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
 720                libc_cv_gcc_incompatible_alias, [dnl
 721 cat > conftest.c <<EOF
 722 int __redirect_foo (const void *s, int c);
 723
 724 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
 725 __typeof (__redirect_foo) *foo_impl (void)
 726 {
 727   return 0;
 728 }
 729
 730 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
 731 EOF
 732 libc_cv_gcc_incompatible_alias=yes
 733 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
 734   libc_cv_gcc_incompatible_alias=no
 735 fi
 736 rm -f conftest*])
 737
 738 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
 739   if test x"$multi_arch" = xyes; then
 740     AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
 741   else
 742     multi_arch=no
 743   fi
 744 fi
 745 if test x"$libc_cv_gcc_indirect_function" != xyes; then
 746   # GCC 8+ emits a warning for alias with incompatible types and it might
 747   # fail to build ifunc resolvers aliases to either weak or internal
 748   # symbols.  Disables multiarch build in this case.
 749   if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
 750     AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
 751     if test x"$multi_arch" = xyes; then
 752       AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
 753     fi
 754     AC_MSG_WARN([Multi-arch is disabled.])
 755     multi_arch=no
 756   elif test x"$multi_arch" = xyes; then
 757     AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
 758 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
 759   fi
 760 fi
 761 multi_arch_d=
 762 if test x"$multi_arch" != xno; then
 763   multi_arch_d=/multiarch
 764 fi
 765
 766 # Compute the list of sysdep directories for this configuration.
 767 # This can take a while to compute.
 768 sysdep_dir=$srcdir/sysdeps
 769 AC_MSG_CHECKING(sysdep dirs)
 770 dnl We need to use [ and ] for other purposes for a while now.
 771 changequote(,)dnl
 772 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
 773 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
 774
 775 test "x$base_os" != x || case "$os" in
 776 gnu*)
 777   base_os=mach/hurd ;;
 778 linux*)
 779   base_os=unix/sysv ;;
 780 esac
 781
 782 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
 783 tail=$os
 784 ostry=$os
 785 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
 786   ostry="$ostry /$o"
 787   tail=$o
 788 done
 789 o=`echo $tail | sed 's/[0-9]*$//'`
 790 if test $o != $tail; then
 791   ostry="$ostry /$o"
 792 fi
 793 # For linux-gnu, try linux-gnu, then linux.
 794 o=`echo $tail | sed 's/-.*$//'`
 795 if test $o != $tail; then
 796   ostry="$ostry /$o"
 797 fi
 798
 799 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
 800 base=
 801 tail=$base_os
 802 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
 803   set $b
 804   base="$base /$1"
 805   tail="$2"
 806 done
 807
 808 # For sparc/sparc32, try sparc/sparc32 and then sparc.
 809 mach=
 810 tail=$machine${submachine:+/$submachine}
 811 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
 812   set $m
 813   # Prepend the machine's FPU directory unless the architecture specific
 814   # preconfigure disables it.
 815   if test "$libc_cv_with_fp" = yes; then
 816     maybe_fpu=/fpu
 817   else
 818     maybe_fpu=/nofpu
 819   fi
 820   # For each machine term, try it with and then without /multiarch.
 821   for try_fpu in $maybe_fpu ''; do
 822     for try_multi in $multi_arch_d ''; do
 823       mach="$mach /$1$try_fpu$try_multi"
 824     done
 825   done
 826   tail="$2"
 827 done
 828
 829 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 830 changequote([,])dnl
 831
 832 # Find what sysdep directories exist.
 833 sysnames=
 834 for b in $base ''; do
 835   for m0 in $mach ''; do
 836     for v in /$vendor ''; do
 837       test "$v" = / && continue
 838       for o in /$ostry ''; do
 839         test "$o" = / && continue
 840         for m in $mach ''; do
 841           try_suffix="$m0$b$v$o$m"
 842           if test -n "$try_suffix"; then
 843             try_srcdir="${srcdir}/"
 844             try="sysdeps$try_suffix"
 845             test -n "$enable_debug_configure" &&
 846             echo "$0 [DEBUG]: try $try" >&2
 847             if test -d "$try_srcdir$try"; then
 848               sysnames="$sysnames $try"
 849               { test -n "$o" || test -n "$b"; } && os_used=t
 850               { test -n "$m" || test -n "$m0"; } && machine_used=t
 851               case x${m0:-$m} in
 852               x*/$submachine) submachine_used=t ;;
 853               esac
 854             fi
 855           fi
 856         done
 857       done
 858     done
 859   done
 860 done
 861
 862 # If the assembler supports gnu_indirect_function symbol type and the
 863 # architecture supports multi-arch, we enable multi-arch by default.
 864 case $sysnames in
 865 *"$multi_arch_d"*)
 866   ;;
 867 *)
 868   test x"$multi_arch" = xdefault && multi_arch=no
 869   ;;
 870 esac
 871 if test x"$multi_arch" != xno; then
 872   AC_DEFINE(USE_MULTIARCH)
 873 fi
 874 AC_SUBST(multi_arch)
 875
 876 if test -z "$os_used" && test "$os" != none; then
 877   AC_MSG_ERROR(Operating system $os is not supported.)
 878 fi
 879 if test -z "$machine_used" && test "$machine" != none; then
 880   AC_MSG_ERROR(The $machine is not supported.)
 881 fi
 882 if test -z "$submachine_used" && test -n "$submachine"; then
 883   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
 884 fi
 885 AC_SUBST(submachine)
 886
 887 # We have now validated the configuration.
 888
 889 # Expand the list of system names into a full list of directories
 890 # from each element's parent name and Implies file (if present).
 891 set $sysnames
 892 names=
 893 while test $# -gt 0; do
 894   name=$1
 895   shift
 896
 897   case " $names " in *" $name "*)
 898     # Already in the list.
 899     continue
 900   esac
 901
 902   # Report each name as we discover it, so there is no long pause in output.
 903   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 904
 905   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
 906
 907   case $name in
 908     /*) xsrcdir= ;;
 909     *)  xsrcdir=$srcdir/ ;;
 910   esac
 911   test -n "$enable_debug_configure" &&
 912   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
 913
 914   for implies_file in Implies Implies-before Implies-after; do
 915     implies_type=`echo $implies_file | sed s/-/_/`
 916     eval ${implies_type}=
 917     if test -f $xsrcdir$name/$implies_file; then
 918       # Collect more names from the `Implies' file (removing comments).
 919       implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
 920       for x in $implied_candidate; do
 921         found=no
 922         if test -d $xsrcdir$name_base/$x; then
 923           eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
 924           found=yes
 925         fi
 926         try="sysdeps/$x"
 927         try_srcdir=$srcdir/
 928         test -n "$enable_debug_configure" &&
 929          echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
 930         if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
 931         then
 932           eval "${implies_type}=\"\$${implies_type} \$try\""
 933           found=yes
 934         fi
 935         if test $found = no; then
 936           AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
 937         fi
 938       done
 939     fi
 940   done
 941
 942   # Add NAME to the list of names.
 943   names="$names $name"
 944
 945   # Find the parent of NAME, using the empty string if it has none.
 946 changequote(,)dnl
 947   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
 948 changequote([,])dnl
 949
 950   test -n "$enable_debug_configure" &&
 951     echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
 952 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
 953
 954   # Add the names implied by NAME, and NAME's parent (if it has one), to
 955   # the list of names to be processed (the argument list).  We prepend the
 956   # implied names to the list and append the parent.  We want implied
 957   # directories to come before further directories inferred from the
 958   # configuration components; this ensures that for sysv4, unix/common
 959   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
 960   # after sysv4).
 961   sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
 962   test -n "$sysnames" && set $sysnames
 963 done
 964
 965 # Add the default directories.
 966 default_sysnames="sysdeps/generic"
 967 sysnames="$names $default_sysnames"
 968 AC_SUBST(sysnames)
 969 # The other names were emitted during the scan.
 970 AC_MSG_RESULT($default_sysnames)
 971
 972
 973 ### Locate tools.
 974
 975 AC_PROG_INSTALL
 976 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
 977   # The makefiles need to use a different form to find it in $srcdir.
 978   INSTALL='\$(..)./scripts/install-sh -c'
 979 fi
 980 AC_PROG_LN_S
 981
 982 LIBC_PROG_BINUTILS
 983
 984 # Accept binutils 2.25 or newer.
 985 AC_CHECK_PROG_VER(AS, $AS, --version,
 986                   [GNU assembler.* \([0-9]*\.[0-9.]*\)],
 987                   [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 988                   AS=: critic_missing="$critic_missing as")
 989
 990 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
 991   # Accept gold 1.14 or higher
 992   AC_CHECK_PROG_VER(LD, $LD, --version,
 993                     [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
 994                     [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
 995                     LD=: critic_missing="$critic_missing GNU gold")
 996 else
 997   AC_CHECK_PROG_VER(LD, $LD, --version,
 998                     [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
 999                     [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1000                     LD=: critic_missing="$critic_missing GNU ld")
1001 fi
1002
1003 # These programs are version sensitive.
1004 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1005   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1006   [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1007
1008 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1009   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1010   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1011   MSGFMT=: aux_missing="$aux_missing msgfmt")
1012 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1013   [GNU texinfo.* \([0-9][0-9.]*\)],
1014   [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1015   MAKEINFO=: aux_missing="$aux_missing makeinfo")
1016 AC_CHECK_PROG_VER(SED, sed, --version,
1017   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1018   [3.0[2-9]*|3.[1-9]*|[4-9]*],
1019   SED=: aux_missing="$aux_missing sed")
1020 AC_CHECK_PROG_VER(AWK, gawk, --version,
1021   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1022   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1023 AC_CHECK_PROG_VER(BISON, bison, --version,
1024   [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1025   [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
1026
1027 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1028 AC_TRY_COMPILE([], [
1029 #if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
1030 #error insufficient compiler
1031 #endif],
1032                [libc_cv_compiler_ok=yes],
1033                [libc_cv_compiler_ok=no])])
1034 AS_IF([test $libc_cv_compiler_ok != yes],
1035       [critic_missing="$critic_missing compiler"])
1036
1037 AC_CHECK_TOOL(NM, nm, false)
1038
1039 if test "x$maintainer" = "xyes"; then
1040   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1041   case "x$AUTOCONF" in
1042   xno|x|x:) AUTOCONF=no ;;
1043   *)
1044     AC_CACHE_CHECK(dnl
1045   whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1046     if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1047       libc_cv_autoconf_works=yes
1048     else
1049       libc_cv_autoconf_works=no
1050     fi])
1051     test $libc_cv_autoconf_works = yes || AUTOCONF=no
1052     ;;
1053   esac
1054   if test "x$AUTOCONF" = xno; then
1055     aux_missing="$aux_missing autoconf"
1056   fi
1057 else
1058   AUTOCONF=no
1059 fi
1060
1061 # Check for python3 if available, or else python.
1062 AC_CHECK_PROG_VER(PYTHON_PROG, python3 python, --version,
1063   [Python \([0-9][0-9.]*\)],
1064   [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
1065   critic_missing="$critic_missing python")
1066 PYTHON="$PYTHON_PROG -B"
1067 AC_SUBST(PYTHON)
1068
1069 test -n "$critic_missing" && AC_MSG_ERROR([
1070 *** These critical programs are missing or too old:$critic_missing
1071 *** Check the INSTALL file for required versions.])
1072
1073 test -n "$aux_missing" && AC_MSG_WARN([
1074 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1075 *** some features or tests will be disabled.
1076 *** Check the INSTALL file for required versions.])
1077
1078 # if using special system headers, find out the compiler's sekrit
1079 # header directory and add that to the list.  NOTE: Only does the right
1080 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
1081 if test -n "$sysheaders"; then
1082   SYSINCLUDES=-nostdinc
1083   for d in include include-fixed; do
1084     i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1085     SYSINCLUDES="$SYSINCLUDES -isystem $i"
1086   done
1087   SYSINCLUDES="$SYSINCLUDES \
1088 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1089   if test -n "$CXX"; then
1090     CXX_SYSINCLUDES=
1091     for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1092     | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1093       test "x$cxxheaders" != x &&
1094       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1095     done
1096   fi
1097 fi
1098 AC_SUBST(SYSINCLUDES)
1099 AC_SUBST(CXX_SYSINCLUDES)
1100
1101 # Obtain some C++ header file paths.  This is used to make a local
1102 # copy of those headers in Makerules.
1103 if test -n "$CXX"; then
1104   find_cxx_header () {
1105     echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1106          | sed -n "\,$1:,{s/:\$//;p}"
1107   }
1108   CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1109   CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1110   CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1111 fi
1112 AC_SUBST(CXX_CSTDLIB_HEADER)
1113 AC_SUBST(CXX_CMATH_HEADER)
1114 AC_SUBST(CXX_BITS_STD_ABS_H)
1115
1116 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1117 # since this would lead to problems installing/building glibc.
1118 # LD_LIBRARY_PATH contains the current directory if one of the following
1119 # is true:
1120 # - one of the terminals (":" and ";") is the first or last sign
1121 # - two terminals occur directly after each other
1122 # - the path contains an element with a dot in it
1123 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1124 changequote(,)dnl
1125 case ${LD_LIBRARY_PATH} in
1126   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1127     ld_library_path_setting="contains current directory"
1128     ;;
1129   *)
1130     ld_library_path_setting="ok"
1131     ;;
1132 esac
1133 changequote([,])dnl
1134 AC_MSG_RESULT($ld_library_path_setting)
1135 if test "$ld_library_path_setting" != "ok"; then
1136 AC_MSG_ERROR([
1137 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1138 *** building glibc. Please change the environment variable
1139 *** and run configure again.])
1140 fi
1141
1142 AC_PATH_PROG(BASH_SHELL, bash, no)
1143
1144 AC_PATH_PROG(PERL, perl, no)
1145 if test "$PERL" != no &&
1146    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1147   PERL=no
1148 fi
1149 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1150              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1151
1152 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1153 cat > conftest.s <<EOF
1154 .text
1155 foo:
1156 .set glibc_conftest_frobozz,foo
1157 .globl glibc_conftest_frobozz
1158 EOF
1159 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1160 # (but it doesn't work), so we must do a linking check to be sure.
1161 cat > conftest1.c <<\EOF
1162 extern int glibc_conftest_frobozz;
1163 void _start() { glibc_conftest_frobozz = 1; }
1164 EOF
1165 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1166             -nostartfiles -nostdlib $no_ssp \
1167             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1168   libc_cv_asm_set_directive=yes
1169 else
1170   libc_cv_asm_set_directive=no
1171 fi
1172 rm -f conftest*])
1173 if test $libc_cv_asm_set_directive = yes; then
1174   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1175 fi
1176
1177 AC_CACHE_CHECK(linker support for protected data symbol,
1178                libc_cv_protected_data,
1179                [cat > conftest.c <<EOF
1180                 int bar __attribute__ ((visibility ("protected"))) = 1;
1181 EOF
1182                 libc_cv_protected_data=no
1183                 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1184                   cat > conftest.c <<EOF
1185                   extern int bar;
1186                   int main (void) { return bar; }
1187 EOF
1188                   if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1189                     libc_cv_protected_data=yes
1190                   fi
1191                 fi
1192                 rm -f conftest.*
1193                ])
1194 AC_SUBST(libc_cv_protected_data)
1195
1196 AC_CACHE_CHECK(linker support for INSERT in linker script,
1197                libc_cv_insert,
1198                [cat > conftest.c <<EOF
1199                 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1200                 int test (void) { return bar; }
1201 EOF
1202                 cat > conftest.t <<EOF
1203                 SECTIONS
1204                 {
1205                   .bar : { *(.bar) }
1206                 }
1207                 INSERT AFTER .rela.dyn;
1208 EOF
1209                 libc_cv_insert=no
1210                 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1211                   libc_cv_insert=yes
1212                 fi
1213                 rm -f conftest.*
1214                ])
1215 AC_SUBST(libc_cv_insert)
1216
1217 AC_CACHE_CHECK(for broken __attribute__((alias())),
1218                libc_cv_broken_alias_attribute,
1219                [cat > conftest.c <<EOF
1220                extern int foo (int x) __asm ("xyzzy");
1221                int bar (int x) { return x; }
1222                extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1223                extern int dfoo;
1224                extern __typeof (dfoo) dfoo __asm ("abccb");
1225                int dfoo = 1;
1226 EOF
1227                libc_cv_broken_alias_attribute=yes
1228                if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1229                  if grep 'xyzzy' conftest.s >/dev/null &&
1230                     grep 'abccb' conftest.s >/dev/null; then
1231                    libc_cv_broken_alias_attribute=no
1232                  fi
1233                fi
1234                rm -f conftest.c conftest.s
1235                ])
1236 if test $libc_cv_broken_alias_attribute = yes; then
1237   AC_MSG_ERROR(working alias attribute support required)
1238 fi
1239
1240 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1241                libc_cv_have_sdata_section,
1242                [echo "int i;" > conftest.c
1243                 libc_cv_have_sdata_section=no
1244                 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1245                    | grep '\.sdata' >/dev/null; then
1246                   libc_cv_have_sdata_section=yes
1247                 fi
1248                 rm -f conftest.c conftest.so
1249                ])
1250 if test $libc_cv_have_sdata_section = yes; then
1251   AC_DEFINE(HAVE_SDATA_SECTION)
1252 fi
1253
1254 AC_CACHE_CHECK(for libunwind-support in compiler,
1255                libc_cv_cc_with_libunwind, [
1256   cat > conftest.c <<EOF
1257 int main (void) { return 0; }
1258 EOF
1259   if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1260      conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1261     libc_cv_cc_with_libunwind=yes
1262   else
1263     libc_cv_cc_with_libunwind=no
1264   fi
1265   rm -f conftest*])
1266 AC_SUBST(libc_cv_cc_with_libunwind)
1267 if test $libc_cv_cc_with_libunwind = yes; then
1268   AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1269 fi
1270
1271 ASFLAGS_config=
1272 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1273                libc_cv_as_noexecstack, [dnl
1274 cat > conftest.c <<EOF
1275 void foo (void) { }
1276 EOF
1277 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1278                    -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1279    && grep .note.GNU-stack conftest.s >/dev/null \
1280    && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1281                       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1282 then
1283   libc_cv_as_noexecstack=yes
1284 else
1285   libc_cv_as_noexecstack=no
1286 fi
1287 rm -f conftest*])
1288 if test $libc_cv_as_noexecstack = yes; then
1289   ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1290 fi
1291 AC_SUBST(ASFLAGS_config)
1292
1293 AC_CACHE_CHECK(for -z combreloc,
1294                libc_cv_z_combreloc, [dnl
1295 cat > conftest.c <<EOF
1296 extern int bar (int);
1297 extern int mumble;
1298 int foo (void) { return bar (mumble); }
1299 EOF
1300 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1301                         -fPIC -shared $no_ssp -o conftest.so conftest.c
1302                         -nostdlib -nostartfiles
1303                         -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1304 then
1305 dnl The following test is a bit weak.  We must use a tool which can test
1306 dnl cross-platform since the gcc used can be a cross compiler.  Without
1307 dnl introducing new options this is not easily doable.  Instead use a tool
1308 dnl which always is cross-platform: readelf.  To detect whether -z combreloc
1309 dnl look for a section named .rel.dyn or .rela.dyn.
1310   if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1311     libc_cv_z_combreloc=yes
1312   else
1313     libc_cv_z_combreloc=no
1314   fi
1315 else
1316   libc_cv_z_combreloc=no
1317 fi
1318 rm -f conftest*])
1319 if test "$libc_cv_z_combreloc" = yes; then
1320   AC_DEFINE(HAVE_Z_COMBRELOC)
1321 fi
1322 AC_SUBST(libc_cv_z_combreloc)
1323
1324 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1325                     [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1326 AC_SUBST(libc_cv_z_execstack)
1327
1328 LIBC_LINKER_FEATURE([-z start-stop-gc], [-Wl,-z,start-stop-gc],
1329                     [libc_cv_z_start_stop_gc=yes], [libc_cv_z_start_stop_gc=no])
1330 LIBC_CONFIG_VAR([have-z-start-stop-gc], [$libc_cv_z_start_stop_gc])
1331
1332 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1333                     [-Wl,--no-dynamic-linker],
1334                     [libc_cv_no_dynamic_linker=yes],
1335                     [libc_cv_no_dynamic_linker=no])
1336 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1337
1338 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1339 LIBC_TRY_CC_OPTION([-static-pie],
1340                    [libc_cv_static_pie=yes],
1341                    [libc_cv_static_pie=no])
1342 ])
1343 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1344
1345 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1346 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1347 ])
1348
1349 AC_SUBST(libc_cv_fpie)
1350
1351 AC_CACHE_CHECK(for --hash-style option,
1352                libc_cv_hashstyle, [dnl
1353 cat > conftest.c <<EOF
1354 int _start (void) { return 42; }
1355 EOF
1356 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1357                             -fPIC -shared -o conftest.so conftest.c
1358                             -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1359 then
1360   libc_cv_hashstyle=yes
1361 else
1362   libc_cv_hashstyle=no
1363 fi
1364 rm -f conftest*])
1365 AC_SUBST(libc_cv_hashstyle)
1366
1367 # The linker's default -shared behavior is good enough if it
1368 # does these things that our custom linker scripts ensure that
1369 # all allocated NOTE sections come first.
1370 if test "$use_default_link" = default; then
1371   AC_CACHE_CHECK([for sufficient default -shared layout],
1372                   libc_cv_use_default_link, [dnl
1373   libc_cv_use_default_link=no
1374   cat > conftest.s <<\EOF
1375           .section .note.a,"a",%note
1376           .balign 4
1377           .long 4,4,9
1378           .string "GNU"
1379           .string "foo"
1380           .section .note.b,"a",%note
1381           .balign 4
1382           .long 4,4,9
1383           .string "GNU"
1384           .string "bar"
1385 EOF
1386   if AC_TRY_COMMAND([dnl
1387   ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1388        ac_try=`$READELF -S conftest.so | sed -n \
1389          ['${x;p;}
1390           s/^ *\[ *[1-9][0-9]*\]  *\([^ ][^ ]*\)  *\([^ ][^ ]*\) .*$/\2 \1/
1391           t a
1392           b
1393           : a
1394           H']`
1395   then
1396     libc_seen_a=no libc_seen_b=no
1397     set -- $ac_try
1398     while test $# -ge 2 -a "$1" = NOTE; do
1399       case "$2" in
1400       .note.a) libc_seen_a=yes ;;
1401       .note.b) libc_seen_b=yes ;;
1402       esac
1403       shift 2
1404     done
1405     case "$libc_seen_a$libc_seen_b" in
1406     yesyes)
1407       libc_cv_use_default_link=yes
1408       ;;
1409     *)
1410       echo >&AS_MESSAGE_LOG_FD "\
1411 $libc_seen_a$libc_seen_b from:
1412 $ac_try"
1413       ;;
1414     esac
1415   fi
1416   rm -f conftest*])
1417   use_default_link=$libc_cv_use_default_link
1418 fi
1419
1420 AC_CACHE_CHECK(for GLOB_DAT reloc,
1421                libc_cv_has_glob_dat, [dnl
1422 cat > conftest.c <<EOF
1423 extern int mumble;
1424 int foo (void) { return mumble; }
1425 EOF
1426 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1427                         -fPIC -shared -o conftest.so conftest.c
1428                         -nostdlib -nostartfiles $no_ssp
1429                         1>&AS_MESSAGE_LOG_FD])
1430 then
1431 dnl look for GLOB_DAT relocation.
1432   if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1433     libc_cv_has_glob_dat=yes
1434   else
1435     libc_cv_has_glob_dat=no
1436   fi
1437 else
1438   libc_cv_has_glob_dat=no
1439 fi
1440 rm -f conftest*])
1441 AC_SUBST(libc_cv_has_glob_dat)
1442
1443 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1444 cat > conftest.c <<EOF
1445 int foo;
1446 EOF
1447 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1448                             conftest.c 1>&AS_MESSAGE_LOG_FD])
1449 then
1450   libc_cv_fno_toplevel_reorder=yes
1451 else
1452   libc_cv_fno_toplevel_reorder=no
1453 fi
1454 rm -f conftest*])
1455 if test $libc_cv_fno_toplevel_reorder = yes; then
1456   fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1457 else
1458   fno_unit_at_a_time=-fno-unit-at-a-time
1459 fi
1460 AC_SUBST(fno_unit_at_a_time)
1461
1462 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1463 [dnl
1464 cat > conftest.c <<EOF
1465 __thread int i;
1466 void foo (void)
1467 {
1468   i = 10;
1469 }
1470 EOF
1471 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1472                    conftest.c 1>&AS_MESSAGE_LOG_FD])
1473 then
1474   libc_cv_mtls_dialect_gnu2=yes
1475 else
1476   libc_cv_mtls_dialect_gnu2=no
1477 fi
1478 rm -f conftest*])
1479 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1480 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1481
1482 AC_CACHE_CHECK(whether cc puts quotes around section names,
1483                libc_cv_have_section_quotes,
1484                [cat > conftest.c <<EOF
1485                 static const int foo
1486                 __attribute__ ((section ("bar"))) = 1;
1487 EOF
1488                 if ${CC-cc} -S conftest.c -o conftest.s; then
1489                   if grep '\.section.*"bar"' conftest.s >/dev/null; then
1490                     libc_cv_have_section_quotes=yes
1491                   else
1492                     libc_cv_have_section_quotes=no
1493                   fi
1494                 else
1495                   libc_cv_have_section_quotes=unknown
1496                 fi
1497                 rm -f conftest.{c,s}
1498                 ])
1499 if test $libc_cv_have_section_quotes = yes; then
1500   AC_DEFINE(HAVE_SECTION_QUOTES)
1501 fi
1502
1503 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1504 cat > conftest.c <<\EOF
1505 void zero (void *x)
1506 {
1507   __builtin_memset (x, 0, 1000);
1508 }
1509 EOF
1510 dnl
1511 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1512 then
1513   libc_cv_gcc_builtin_memset=no
1514 else
1515   libc_cv_gcc_builtin_memset=yes
1516 fi
1517 rm -f conftest* ])
1518 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1519   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1520 fi
1521
1522 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1523 cat > conftest.c <<\EOF
1524 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1525 char *foo (const char *a, const char *b)
1526 {
1527   return __builtin_strstr (a, b);
1528 }
1529 EOF
1530 dnl
1531 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1532 then
1533   libc_cv_gcc_builtin_redirection=yes
1534 else
1535   libc_cv_gcc_builtin_redirection=no
1536 fi
1537 rm -f conftest* ])
1538 if test "$libc_cv_gcc_builtin_redirection" = no; then
1539   AC_MSG_ERROR([support for the symbol redirection needed])
1540 fi
1541
1542 dnl Determine how to disable generation of FMA instructions.
1543 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1544                libc_cv_cc_nofma, [dnl
1545 libc_cv_cc_nofma=
1546 for opt in -ffp-contract=off -mno-fused-madd; do
1547   LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1548 done])
1549 AC_SUBST(libc_cv_cc_nofma)
1550
1551 if test -n "$submachine"; then
1552   AC_CACHE_CHECK([for compiler option for CPU variant],
1553                  libc_cv_cc_submachine, [dnl
1554   libc_cv_cc_submachine=no
1555   for opt in "-march=$submachine" "-mcpu=$submachine"; do
1556     LIBC_TRY_CC_OPTION([$opt], [
1557       libc_cv_cc_submachine="$opt"
1558       break], [])
1559   done])
1560   if test "x$libc_cv_cc_submachine" = xno; then
1561     AC_MSG_ERROR([${CC-cc} does not support $submachine])
1562   fi
1563 fi
1564 AC_SUBST(libc_cv_cc_submachine)
1565
1566 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1567 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1568 cat > conftest.c <<EOF
1569 void
1570 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1571 foo (void) {}
1572 EOF
1573 libc_cv_cc_loop_to_function=no
1574 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1575 then
1576   libc_cv_cc_loop_to_function=yes
1577 fi
1578 rm -f conftest*])
1579 if test $libc_cv_cc_loop_to_function = yes; then
1580   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1581 fi
1582 AC_SUBST(libc_cv_cc_loop_to_function)
1583
1584 dnl Check whether we have the gd library available.
1585 AC_MSG_CHECKING(for libgd)
1586 if test "$with_gd" != "no"; then
1587   old_CFLAGS="$CFLAGS"
1588   CFLAGS="$CFLAGS $libgd_include"
1589   old_LDFLAGS="$LDFLAGS"
1590   LDFLAGS="$LDFLAGS $libgd_ldflags"
1591   old_LIBS="$LIBS"
1592   LIBS="$LIBS -lgd -lpng -lz -lm"
1593   AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <gd.h>]], [[gdImagePng (0, 0)]])],
1594                  [LIBGD=yes], [LIBGD=no])
1595   CFLAGS="$old_CFLAGS"
1596   LDFLAGS="$old_LDFLAGS"
1597   LIBS="$old_LIBS"
1598 else
1599   LIBGD=no
1600 fi
1601 AC_MSG_RESULT($LIBGD)
1602 AC_SUBST(LIBGD)
1603
1604 # SELinux detection
1605 if test x$with_selinux = xno ; then
1606   have_selinux=no;
1607 else
1608   # See if we have the SELinux library
1609   AC_CHECK_LIB(selinux, is_selinux_enabled,
1610                have_selinux=yes, have_selinux=no)
1611   if test x$with_selinux = xyes ; then
1612     if test x$have_selinux = xno ; then
1613       AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1614     fi
1615   fi
1616 fi
1617 # Check if we're building with SELinux support.
1618 if test "x$have_selinux" = xyes; then
1619   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1620
1621   # See if we have the libaudit library
1622   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1623                have_libaudit=yes, have_libaudit=no)
1624   if test "x$have_libaudit" = xyes; then
1625     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1626   fi
1627   AC_SUBST(have_libaudit)
1628
1629   # See if we have the libcap library
1630   AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1631   if test "x$have_libcap" = xyes; then
1632     AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1633   fi
1634   AC_SUBST(have_libcap)
1635 fi
1636 AC_SUBST(have_selinux)
1637
1638 CPPUNDEFS=
1639 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1640 dnl Since we are building the implementations of the fortified functions here,
1641 dnl having the macro defined interacts very badly.
1642 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1643 [AC_TRY_COMPILE([], [
1644 #ifdef _FORTIFY_SOURCE
1645 # error bogon
1646 #endif],
1647                 [libc_cv_predef_fortify_source=no],
1648                 [libc_cv_predef_fortify_source=yes])])
1649 if test $libc_cv_predef_fortify_source = yes; then
1650   CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1651 fi
1652 AC_SUBST(CPPUNDEFS)
1653
1654 # Some linkers on some architectures support __ehdr_start but with
1655 # bugs.  Make sure usage of it does not create relocations in the
1656 # output (as the linker should resolve them all for us).
1657 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1658                libc_cv_ehdr_start, [
1659 old_CFLAGS="$CFLAGS"
1660 old_LDFLAGS="$LDFLAGS"
1661 old_LIBS="$LIBS"
1662 CFLAGS="$CFLAGS -fPIC"
1663 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1664 LIBS=
1665 AC_LINK_IFELSE([AC_LANG_SOURCE([
1666 typedef struct {
1667   char foo;
1668   long val;
1669 } Ehdr;
1670 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1671 long ehdr (void) { return __ehdr_start.val; }
1672 ])],
1673                [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1674                   libc_cv_ehdr_start=broken
1675                 else
1676                   libc_cv_ehdr_start=yes
1677                 fi], [libc_cv_ehdr_start=no])
1678 CFLAGS="$old_CFLAGS"
1679 LDFLAGS="$old_LDFLAGS"
1680 LIBS="$old_LIBS"
1681 ])
1682 if test "$libc_cv_ehdr_start" = yes; then
1683   AC_DEFINE([HAVE_EHDR_START])
1684 elif test "$libc_cv_ehdr_start" = broken; then
1685   AC_MSG_WARN([linker is broken -- you should upgrade])
1686 fi
1687
1688 dnl Starting with binutils 2.35, GAS can attach multiple symbol versions
1689 dnl to one symbol (PR 23840).
1690 AC_CACHE_CHECK(whether the assembler requires one version per symbol,
1691                libc_cv_symver_needs_alias, [dnl
1692   cat > conftest.s <<EOF
1693         .text
1694 testfunc:
1695         .globl testfunc
1696         .symver testfunc, testfunc1@VERSION1
1697         .symver testfunc, testfunc1@VERSION2
1698 EOF
1699   libc_cv_symver_needs_alias=no
1700   if ${CC-cc} $ASFLAGS -c conftest.s 2>&AS_MESSAGE_LOG_FD; then
1701     libc_cv_symver_needs_alias=no
1702   else
1703     libc_cv_symver_needs_alias=yes
1704   fi
1705   rm conftest.*
1706 ])
1707 if test "$libc_cv_symver_needs_alias" = yes; then
1708   AC_DEFINE(SYMVER_NEEDS_ALIAS)
1709 fi
1710
1711 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1712                libc_cv_builtin_trap, [dnl
1713 libc_cv_builtin_trap=no
1714 AC_TRY_COMPILE([], [__builtin_trap ()], [
1715 libc_undefs=`$NM -u conftest.o |
1716   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1717     2>&AS_MESSAGE_LOG_FD` || {
1718   AC_MSG_ERROR([confusing output from $NM -u])
1719 }
1720 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1721 if test -z "$libc_undefs"; then
1722   libc_cv_builtin_trap=yes
1723 fi])])
1724 if test $libc_cv_builtin_trap = yes; then
1725   AC_DEFINE([HAVE_BUILTIN_TRAP])
1726 fi
1727
1728 dnl C++ feature tests.
1729 AC_LANG_PUSH([C++])
1730
1731 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1732                libc_cv_cxx_thread_local, [
1733 old_CXXFLAGS="$CXXFLAGS"
1734 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1735 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1736 #include <thread>
1737
1738 // Compiler support.
1739 struct S
1740 {
1741   S ();
1742   ~S ();
1743 };
1744 thread_local S s;
1745 S * get () { return &s; }
1746
1747 // libstdc++ support.
1748 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1749 #error __cxa_thread_atexit_impl not supported
1750 #endif
1751 ])],
1752                [libc_cv_cxx_thread_local=yes],
1753                [libc_cv_cxx_thread_local=no])
1754 CXXFLAGS="$old_CXXFLAGS"
1755 ])
1756 AC_SUBST(libc_cv_cxx_thread_local)
1757
1758 AC_LANG_POP([C++])
1759 dnl End of C++ feature tests.
1760
1761 ### End of automated tests.
1762 ### Now run sysdeps configure fragments.
1763
1764 # They also can set these variables.
1765 use_ldconfig=no
1766 ldd_rewrite_script=no
1767 libc_cv_sysconfdir=$sysconfdir
1768 libc_cv_localstatedir=$localstatedir
1769 libc_cv_gcc_unwind_find_fde=no
1770 libc_cv_idn=no
1771 pthread_in_libc=yes
1772
1773 # Iterate over all the sysdep directories we will use, running their
1774 # configure fragments.
1775 for dir in $sysnames; do
1776   case $dir in
1777     /*) dest=$dir ;;
1778     *)  dest=$srcdir/$dir ;;
1779   esac
1780   if test -r $dest/configure; then
1781     AC_MSG_RESULT(running configure fragment for $dir)
1782     . $dest/configure
1783   fi
1784 done
1785
1786 if test x"$build_mathvec" = xnotset; then
1787   build_mathvec=no
1788 fi
1789 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1790
1791 AC_SUBST(libc_extra_cflags)
1792 AC_SUBST(libc_extra_cppflags)
1793
1794 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1795   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1796 fi
1797 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1798
1799 # A sysdeps configure fragment can reset this if IFUNC is not actually
1800 # usable even though the assembler knows how to generate the symbol type.
1801 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1802   AC_DEFINE(HAVE_IFUNC)
1803 fi
1804 LIBC_CONFIG_VAR([have-ifunc], [$libc_cv_ld_gnu_indirect_function])
1805
1806 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1807   AC_DEFINE(HAVE_GCC_IFUNC)
1808 fi
1809 LIBC_CONFIG_VAR([have-gcc-ifunc], [$libc_cv_gcc_indirect_function])
1810
1811 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1812 # configure fragment can override the value to prevent this AC_DEFINE.
1813 AC_SUBST(use_nscd)
1814 if test "x$use_nscd" != xno; then
1815   AC_DEFINE([USE_NSCD])
1816 fi
1817 if test "x$build_nscd" = xdefault; then
1818   build_nscd=$use_nscd
1819 fi
1820
1821 AC_SUBST(libc_cv_slibdir)
1822 AC_SUBST(libc_cv_rtlddir)
1823 AC_SUBST(libc_cv_complocaledir)
1824 AC_SUBST(libc_cv_sysconfdir)
1825 AC_SUBST(libc_cv_localstatedir)
1826 AC_SUBST(libc_cv_rootsbindir)
1827
1828 if test x$use_ldconfig = xyes; then
1829   AC_DEFINE(USE_LDCONFIG)
1830 fi
1831 AC_SUBST(use_ldconfig)
1832 AC_SUBST(ldd_rewrite_script)
1833
1834 AC_SUBST(static)
1835 AC_SUBST(shared)
1836
1837 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1838 [libc_cv_pic_default=yes
1839 cat > conftest.c <<EOF
1840 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1841 # error PIC is default.
1842 #endif
1843 EOF
1844 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1845   libc_cv_pic_default=no
1846 fi
1847 rm -f conftest.*])
1848 AC_SUBST(libc_cv_pic_default)
1849
1850 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1851 [libc_cv_cc_pie_default=yes
1852 cat > conftest.c <<EOF
1853 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1854 # error PIE is default.
1855 #endif
1856 EOF
1857 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1858   libc_cv_cc_pie_default=no
1859 fi
1860 rm -f conftest.*])
1861 libc_cv_pie_default=$libc_cv_cc_pie_default
1862 AC_SUBST(libc_cv_cc_pie_default)
1863 AC_SUBST(libc_cv_pie_default)
1864
1865 # Set the `multidir' variable by grabbing the variable from the compiler.
1866 # We do it once and save the result in a generated makefile.
1867 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1868 AC_SUBST(libc_cv_multidir)
1869
1870 if test "$static_pie" = yes; then
1871   # Check target support for static PIE
1872   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifndef SUPPORT_STATIC_PIE
1873 # error static PIE is not supported
1874 #endif]])], , AC_MSG_ERROR([the architecture does not support static PIE]))
1875   # The linker must support --no-dynamic-linker.
1876   if test "$libc_cv_no_dynamic_linker" != yes; then
1877     AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1878   fi
1879   # Default to PIE.
1880   libc_cv_pie_default=yes
1881   AC_DEFINE(ENABLE_STATIC_PIE)
1882 fi
1883 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1884
1885 AC_SUBST(profile)
1886 AC_SUBST(static_nss)
1887
1888 AC_SUBST(DEFINES)
1889
1890 dnl See sysdeps/mach/configure.ac for this variable.
1891 AC_SUBST(mach_interface_list)
1892
1893 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1894 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1895 AC_SUBST(VERSION)
1896 AC_SUBST(RELEASE)
1897
1898 if test "$pthread_in_libc" = yes; then
1899   AC_DEFINE(PTHREAD_IN_LIBC)
1900 fi
1901 AC_SUBST(pthread_in_libc)
1902
1903 AC_CONFIG_FILES([config.make Makefile])
1904 AC_CONFIG_COMMANDS([default],[[
1905 case $CONFIG_FILES in *config.make*)
1906 echo "$config_vars" >> config.make;;
1907 esac
1908 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1909 AC_OUTPUT