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)], [http://sourceware.org/bugzilla/], [glibc])
   4 AC_CONFIG_SRCDIR([include/features.h])
   5 AC_CONFIG_HEADERS([config.h])
   6 AC_CONFIG_AUX_DIR([scripts])
   7
   8 ACX_PKGVERSION([GNU libc])
   9 ACX_BUGURL([http://www.gnu.org/software/libc/bugs.html])
  10 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
  11                    [Package description])
  12 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
  13                    [Bug reporting address])
  14
  15 # Glibc should not depend on any header files
  16 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
  17   [m4_divert_text([DEFAULTS],
  18     [ac_includes_default='/* none */'])])
  19
  20 # We require GCC, and by default use its preprocessor.  Override AC_PROG_CPP
  21 # here to work around the Autoconf issue discussed in
  22 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
  23 AC_DEFUN([AC_PROG_CPP],
  24 [AC_REQUIRE([AC_PROG_CC])dnl
  25 AC_ARG_VAR([CPP],      [C preprocessor])dnl
  26 _AC_ARG_VAR_CPPFLAGS()dnl
  27 # On Suns, sometimes $CPP names a directory.
  28 if test -n "$CPP" && test -d "$CPP"; then
  29   CPP=
  30 fi
  31 if test -z "$CPP"; then
  32   CPP="$CC -E"
  33 fi
  34 AC_SUBST(CPP)dnl
  35 ])# AC_PROG_CPP
  36
  37 # We require GCC.  Override _AC_PROG_CC_C89 here to work around the Autoconf
  38 # issue discussed in
  39 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
  40 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
  41
  42 dnl This is here so we can set $subdirs directly based on configure fragments.
  43 AC_CONFIG_SUBDIRS()
  44
  45 AC_CANONICAL_HOST
  46
  47 AC_PROG_CC
  48 if test $host != $build; then
  49   AC_CHECK_PROGS(BUILD_CC, gcc cc)
  50 fi
  51 AC_SUBST(cross_compiling)
  52 AC_PROG_CPP
  53 AC_CHECK_TOOL(READELF, readelf, false)
  54
  55 # We need the C++ compiler only for testing.
  56 AC_PROG_CXX
  57 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
  58 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
  59 AC_LANG_PUSH([C++])
  60 # Default, dynamic case.
  61 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  62                [libc_cv_cxx_link_ok=yes],
  63                [libc_cv_cxx_link_ok=no])
  64 # Static case.
  65 old_LDFLAGS="$LDFLAGS"
  66 LDFLAGS="$LDFLAGS -static"
  67 AC_LINK_IFELSE([AC_LANG_SOURCE([
  68 #include <iostream>
  69
  70 int
  71 main()
  72 {
  73   std::cout << "Hello, world!";
  74   return 0;
  75 }
  76 ])],
  77                [],
  78                [libc_cv_cxx_link_ok=no])
  79 LDFLAGS="$old_LDFLAGS"
  80 AC_LANG_POP([C++])])
  81 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
  82
  83 if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
  84   AC_MSG_ERROR([you must configure in a separate build directory])
  85 fi
  86
  87 # This will get text that should go into config.make.
  88 config_vars=
  89
  90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
  91 AC_ARG_WITH([gd],
  92             AC_HELP_STRING([--with-gd=DIR],
  93                            [find libgd include dir and library with prefix DIR]),
  94             [dnl
  95 case "$with_gd" in
  96 yes|''|no) ;;
  97 *) libgd_include="-I$withval/include"
  98    libgd_ldflags="-L$withval/lib" ;;
  99 esac
 100 ])
 101 AC_ARG_WITH([gd-include],
 102             AC_HELP_STRING([--with-gd-include=DIR],
 103                            [find libgd include files in DIR]),
 104             [dnl
 105 case "$with_gd_include" in
 106 ''|no) ;;
 107 *) libgd_include="-I$withval" ;;
 108 esac
 109 ])
 110 AC_ARG_WITH([gd-lib],
 111             AC_HELP_STRING([--with-gd-lib=DIR],
 112                            [find libgd library files in DIR]),
 113             [dnl
 114 case "$with_gd_lib" in
 115 ''|no) ;;
 116 *) libgd_ldflags="-L$withval" ;;
 117 esac
 118 ])
 119
 120 if test -n "$libgd_include"; then
 121   config_vars="$config_vars
 122 CFLAGS-memusagestat.c = $libgd_include"
 123 fi
 124 if test -n "$libgd_ldflags"; then
 125   config_vars="$config_vars
 126 libgd-LDFLAGS = $libgd_ldflags"
 127 fi
 128
 129 dnl Arguments to specify presence of other packages/features.
 130 AC_ARG_WITH([fp],
 131             AC_HELP_STRING([--with-fp],
 132                            [if using floating-point hardware @<:@default=yes@:>@]),
 133             [with_fp=$withval],
 134             [with_fp=yes])
 135 AC_SUBST(with_fp)
 136 AC_ARG_WITH([binutils],
 137             AC_HELP_STRING([--with-binutils=PATH],
 138                            [specify location of binutils (as and ld)]),
 139             [path_binutils=$withval],
 140             [path_binutils=''])
 141 AC_ARG_WITH([selinux],
 142             AC_HELP_STRING([--with-selinux],
 143                            [if building with SELinux support]),
 144             [with_selinux=$withval],
 145             [with_selinux=auto])
 146
 147 AC_ARG_WITH([headers],
 148             AC_HELP_STRING([--with-headers=PATH],
 149                            [location of system headers to use
 150                             (for example /usr/src/linux/include)
 151                             @<:@default=compiler default@:>@]),
 152             [sysheaders=$withval],
 153             [sysheaders=''])
 154 AC_SUBST(sysheaders)
 155
 156 AC_SUBST(use_default_link)
 157 AC_ARG_WITH([default-link],
 158             AC_HELP_STRING([--with-default-link],
 159                            [do not use explicit linker scripts]),
 160             [use_default_link=$withval],
 161             [use_default_link=default])
 162
 163 AC_ARG_ENABLE([sanity-checks],
 164               AC_HELP_STRING([--disable-sanity-checks],
 165                              [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
 166               [enable_sanity=$enableval],
 167               [enable_sanity=yes])
 168
 169 AC_ARG_ENABLE([shared],
 170               AC_HELP_STRING([--enable-shared],
 171                              [build shared library @<:@default=yes if GNU ld@:>@]),
 172               [shared=$enableval],
 173               [shared=yes])
 174 AC_ARG_ENABLE([profile],
 175               AC_HELP_STRING([--enable-profile],
 176                              [build profiled library @<:@default=no@:>@]),
 177               [profile=$enableval],
 178               [profile=no])
 179 AC_ARG_ENABLE([timezone-tools],
 180               AC_HELP_STRING([--disable-timezone-tools],
 181                              [do not install timezone tools @<:@default=install@:>@]),
 182               [enable_timezone_tools=$enableval],
 183               [enable_timezone_tools=yes])
 184 AC_SUBST(enable_timezone_tools)
 185
 186 AC_ARG_ENABLE([hardcoded-path-in-tests],
 187               AC_HELP_STRING([--enable-hardcoded-path-in-tests],
 188                              [hardcode newly built glibc path in tests @<:@default=no@:>@]),
 189               [hardcoded_path_in_tests=$enableval],
 190               [hardcoded_path_in_tests=no])
 191 AC_SUBST(hardcoded_path_in_tests)
 192
 193 AC_ARG_ENABLE([stackguard-randomization],
 194               AC_HELP_STRING([--enable-stackguard-randomization],
 195                              [initialize __stack_chk_guard canary with a random number at program start]),
 196               [enable_stackguard_randomize=$enableval],
 197               [enable_stackguard_randomize=no])
 198 if test "$enable_stackguard_randomize" = yes; then
 199   AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
 200 fi
 201
 202 AC_ARG_ENABLE([lock-elision],
 203               AC_HELP_STRING([--enable-lock-elision[=yes/no]],
 204                              [Enable lock elision for pthread mutexes by default]),
 205               [enable_lock_elision=$enableval],
 206               [enable_lock_elision=no])
 207 AC_SUBST(enable_lock_elision)
 208 if test "$enable_lock_elision" = yes ; then
 209   AC_DEFINE(ENABLE_LOCK_ELISION)
 210 fi
 211
 212 dnl Generic infrastructure for drop-in additions to libc.
 213 AC_ARG_ENABLE([add-ons],
 214               AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
 215                              [configure and build add-ons in DIR1,DIR2,...
 216                               search for add-ons if no parameter given]),
 217                              , [enable_add_ons=yes])
 218
 219 AC_ARG_ENABLE([hidden-plt],
 220               AC_HELP_STRING([--disable-hidden-plt],
 221                              [do not hide internal function calls to avoid PLT]),
 222               [hidden=$enableval],
 223               [hidden=yes])
 224 if test "x$hidden" = xno; then
 225   AC_DEFINE(NO_HIDDEN)
 226 fi
 227
 228 AC_ARG_ENABLE([bind-now],
 229               AC_HELP_STRING([--enable-bind-now],
 230                              [disable lazy relocations in DSOs]),
 231               [bindnow=$enableval],
 232               [bindnow=no])
 233 AC_SUBST(bindnow)
 234 if test "x$bindnow" = xyes; then
 235   AC_DEFINE(BIND_NOW)
 236 fi
 237
 238 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
 239 dnl -fstack-protector-strong.
 240 AC_ARG_ENABLE([stack-protector],
 241               AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
 242                              [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
 243               [enable_stack_protector=$enableval],
 244               [enable_stack_protector=no])
 245 case "$enable_stack_protector" in
 246 all|yes|no|strong) ;;
 247 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
 248 esac
 249
 250 dnl On some platforms we cannot use dynamic loading.  We must provide
 251 dnl static NSS modules.
 252 AC_ARG_ENABLE([static-nss],
 253               AC_HELP_STRING([--enable-static-nss],
 254                              [build static NSS modules @<:@default=no@:>@]),
 255               [static_nss=$enableval],
 256               [static_nss=no])
 257 dnl Enable static NSS also if we build no shared objects.
 258 if test x"$static_nss" = xyes || test x"$shared" = xno; then
 259   static_nss=yes
 260   AC_DEFINE(DO_STATIC_NSS)
 261 fi
 262
 263 AC_ARG_ENABLE([force-install],
 264               AC_HELP_STRING([--disable-force-install],
 265                              [don't force installation of files from this package, even if they are older than the installed files]),
 266               [force_install=$enableval],
 267               [force_install=yes])
 268 AC_SUBST(force_install)
 269
 270 AC_ARG_ENABLE([maintainer-mode],
 271               AC_HELP_STRING([--enable-maintainer-mode],
 272                              [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
 273               [maintainer=$enableval],
 274               [maintainer=no])
 275
 276 dnl On some platforms we allow dropping compatibility with all kernel
 277 dnl versions.
 278 AC_ARG_ENABLE([kernel],
 279               AC_HELP_STRING([--enable-kernel=VERSION],
 280                              [compile for compatibility with kernel not older than VERSION]),
 281               [minimum_kernel=$enableval],
 282               [])
 283 dnl Prevent unreasonable values.
 284 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
 285   # Better nothing than this.
 286   minimum_kernel=""
 287 else
 288   if test "$minimum_kernel" = current; then
 289     minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
 290   fi
 291 fi
 292
 293 dnl For the development we sometimes want gcc to issue even more warnings.
 294 dnl This is not the default since many of the extra warnings are not
 295 dnl appropriate.
 296 AC_ARG_ENABLE([all-warnings],
 297               AC_HELP_STRING([--enable-all-warnings],
 298                              [enable all useful warnings gcc can issue]),
 299               [all_warnings=$enableval],
 300               [])
 301 AC_SUBST(all_warnings)
 302
 303 AC_ARG_ENABLE([werror],
 304               AC_HELP_STRING([--disable-werror],
 305                              [do not build with -Werror]),
 306               [enable_werror=$enableval],
 307               [enable_werror=yes])
 308 AC_SUBST(enable_werror)
 309
 310 AC_ARG_ENABLE([multi-arch],
 311               AC_HELP_STRING([--enable-multi-arch],
 312                              [enable single DSO with optimizations for multiple architectures]),
 313               [multi_arch=$enableval],
 314               [multi_arch=default])
 315
 316 AC_ARG_ENABLE([nss-crypt],
 317               AC_HELP_STRING([--enable-nss-crypt],
 318                              [enable libcrypt to use nss]),
 319               [nss_crypt=$enableval],
 320               [nss_crypt=no])
 321 if test x$nss_crypt = xyes; then
 322   nss_includes=-I$(nss-config --includedir 2>/dev/null)
 323   if test $? -ne 0; then
 324     AC_MSG_ERROR([cannot find include directory with nss-config])
 325   fi
 326   old_CFLAGS="$CFLAGS"
 327   CFLAGS="$CFLAGS $nss_includes"
 328   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 329 #include <hasht.h>
 330 #include <nsslowhash.h>
 331 void f (void) { NSSLOW_Init (); }])],
 332              libc_cv_nss_crypt=yes,
 333              AC_MSG_ERROR([
 334 cannot find NSS headers with lowlevel hash function interfaces]))
 335   old_LIBS="$LIBS"
 336   old_LDFLAGS="$LDFLAGS"
 337   LIBS="$LIBS -lfreebl3"
 338   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 339 #include <hasht.h>
 340 #include <nsslowhash.h>],
 341                                   [NSSLOW_Init();])],
 342                  libc_cv_nss_crypt=yes,
 343                  AC_MSG_ERROR([
 344 cannot link program using lowlevel NSS hash functions]))
 345   # Check to see if there is a static NSS cryptographic library.
 346   # If there isn't then we can't link anything with libcrypt.a,
 347   # and that might mean disabling some static tests.
 348   LDFLAGS="$LDFLAGS -static"
 349   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 350 #include <hasht.h>
 351 #include <nsslowhash.h>],
 352                                   [NSSLOW_Init();])],
 353                  libc_cv_static_nss_crypt=yes,
 354                  libc_cv_static_nss_crypt=no)
 355   LDFLAGS="$old_LDFLAGS"
 356   CFLAGS="$old_CFLAGS"
 357   LIBS="$old_LIBS"
 358 else
 359   libc_cv_nss_crypt=no
 360   libc_cv_static_nss_crypt=no
 361 fi
 362 AC_SUBST(libc_cv_nss_crypt)
 363 AC_SUBST(libc_cv_static_nss_crypt)
 364
 365
 366 AC_ARG_ENABLE([obsolete-rpc],
 367               AC_HELP_STRING([--enable-obsolete-rpc],
 368                              [build and install the obsolete RPC code for link-time usage]),
 369               [link_obsolete_rpc=$enableval],
 370               [link_obsolete_rpc=no])
 371 AC_SUBST(link_obsolete_rpc)
 372
 373 if test "$link_obsolete_rpc" = yes; then
 374   AC_DEFINE(LINK_OBSOLETE_RPC)
 375 fi
 376
 377 AC_ARG_ENABLE([obsolete-nsl],
 378               AC_HELP_STRING([--enable-obsolete-nsl],
 379                              [build and install the obsolete libnsl library and depending NSS modules]),
 380               [build_obsolete_nsl=$enableval],
 381               [build_obsolete_nsl=no])
 382 AC_SUBST(build_obsolete_nsl)
 383
 384 if test "$build_obsolete_nsl" = yes; then
 385   AC_DEFINE(LINK_OBSOLETE_NSL)
 386 fi
 387
 388 AC_ARG_ENABLE([systemtap],
 389               [AS_HELP_STRING([--enable-systemtap],
 390                [enable systemtap static probe points @<:@default=no@:>@])],
 391               [systemtap=$enableval],
 392               [systemtap=no])
 393 if test "x$systemtap" != xno; then
 394   AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
 395   old_CFLAGS="$CFLAGS"
 396   CFLAGS="-std=gnu11 $CFLAGS"
 397   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
 398 void foo (int i, void *p)
 399 {
 400   asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
 401        :: STAP_PROBE_ASM_OPERANDS (2, i, p));
 402 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
 403   CFLAGS="$old_CFLAGS"])
 404   if test $libc_cv_sdt = yes; then
 405     AC_DEFINE([USE_STAP_PROBE])
 406   elif test "x$systemtap" != xauto; then
 407     AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
 408   fi
 409 fi
 410
 411 AC_ARG_ENABLE([build-nscd],
 412               [AS_HELP_STRING([--disable-build-nscd],
 413                [disable building and installing the nscd daemon])],
 414               [build_nscd=$enableval],
 415               [build_nscd=default])
 416 AC_SUBST(build_nscd)
 417
 418 # Note the use of $use_nscd is near the bottom of the file.
 419 AC_ARG_ENABLE([nscd],
 420               [AS_HELP_STRING([--disable-nscd],
 421                [library functions will not contact the nscd daemon])],
 422               [use_nscd=$enableval],
 423               [use_nscd=yes])
 424
 425 AC_ARG_ENABLE([pt_chown],
 426               [AS_HELP_STRING([--enable-pt_chown],
 427                [Enable building and installing pt_chown])],
 428               [build_pt_chown=$enableval],
 429               [build_pt_chown=no])
 430 AC_SUBST(build_pt_chown)
 431 if test "$build_pt_chown" = yes; then
 432   AC_DEFINE(HAVE_PT_CHOWN)
 433 fi
 434
 435 AC_ARG_ENABLE([tunables],
 436               [AS_HELP_STRING([--enable-tunables],
 437                [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
 438               [have_tunables=$enableval],
 439               [have_tunables=yes])
 440 AC_SUBST(have_tunables)
 441 if test "$have_tunables" = yes; then
 442   AC_DEFINE(HAVE_TUNABLES)
 443 fi
 444
 445 # The abi-tags file uses a fairly simplistic model for name recognition that
 446 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
 447 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
 448 # This doesn't get used much beyond that, so it's fairly safe.
 449 case "$host_os" in
 450 linux*)
 451   ;;
 452 gnu*)
 453   host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
 454   ;;
 455 esac
 456
 457 AC_ARG_ENABLE([mathvec],
 458               [AS_HELP_STRING([--enable-mathvec],
 459               [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
 460               [build_mathvec=$enableval],
 461               [build_mathvec=notset])
 462
 463 # We keep the original values in `$config_*' and never modify them, so we
 464 # can write them unchanged into config.make.  Everything else uses
 465 # $machine, $vendor, and $os, and changes them whenever convenient.
 466 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
 467
 468 # Don't allow vendor == "unknown"
 469 test "$config_vendor" = unknown && config_vendor=
 470 config_os="`echo $config_os | sed 's/^unknown-//'`"
 471
 472 # Some configurations imply other options.
 473 elf=yes
 474
 475 # The configure fragment of an add-on port can modify these to supplement
 476 # or override the table in the case statement below.  No fragment should
 477 # ever change the config_* variables, however.
 478 machine=$config_machine
 479 vendor=$config_vendor
 480 os=$config_os
 481 base_os=''
 482
 483 submachine=
 484 AC_ARG_WITH([cpu],
 485             AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
 486             [dnl
 487   case "$withval" in
 488   yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
 489   no) ;;
 490   *) submachine="$withval" ;;
 491   esac
 492 ])
 493
 494 # An preconfigure script can set this when it wants to disable the sanity
 495 # check below.
 496 libc_config_ok=no
 497
 498 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
 499 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 500
 501 dnl Having this here, though empty, makes sure that if add-ons' fragments
 502 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
 503 dnl our AC_OUTPUT will actually use it.
 504 AC_CONFIG_SUBDIRS()
 505
 506 case "$enable_add_ons" in
 507 ''|no) add_ons= ;;
 508 yes|'*')
 509  add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
 510           sed 's@/[[^/]]*$@@' | sort | uniq`
 511          add_ons_automatic=yes
 512          ;;
 513 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
 514        add_ons_automatic=no ;;
 515 esac
 516
 517 configured_add_ons=
 518 add_ons_sfx=
 519 add_ons_pfx=
 520 if test x"$add_ons" != x; then
 521   for f in $add_ons; do
 522     # Some sanity checks
 523     case "$f" in
 524     crypt)
 525       AC_MSG_ERROR([
 526 *** It seems that you're using an old \`crypt' add-on.  crypt is now
 527 *** part of glibc and using the old add-on will not work with this
 528 *** release.  Start again with fresh sources and without the old
 529 *** \`crypt' add-on.])
 530     ;;
 531     localedata)
 532       AC_MSG_ERROR([
 533 *** It seems that you're using an old \`localedata' add-on.  localedata
 534 *** is now part of glibc and using the old add-on will not work with
 535 *** this release.  Start again with fresh sources and without the old
 536 *** \`localedata' add-on.])
 537     ;;
 538     esac
 539   done
 540
 541   # Now source each add-on's configure fragment.
 542   # The fragments can use $srcdir/$libc_add_on to find themselves,
 543   # and test $add_ons_automatic to see if they were explicitly requested.
 544   # A fragment can clear (or even change) $libc_add_on to affect
 545   # whether it goes into the list to be actually used in the build.
 546   use_add_ons=
 547   for libc_add_on in $add_ons; do
 548     # Test whether such a directory really exists.
 549     # It can be absolute, or relative to $srcdir, or relative to the build dir.
 550     case "$libc_add_on" in
 551     /*)
 552       libc_add_on_srcdir=$libc_add_on
 553       ;;
 554     *)
 555       test -d "$srcdir/$libc_add_on" || {
 556         if test -d "$libc_add_on"; then
 557           libc_add_on="`pwd`/$libc_add_on"
 558         else
 559           AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
 560         fi
 561       }
 562       libc_add_on_srcdir=$srcdir/$libc_add_on
 563       ;;
 564     esac
 565
 566     libc_add_on_frag=$libc_add_on_srcdir/configure
 567     libc_add_on_canonical=
 568     libc_add_on_config_subdirs=
 569     if test -r "$libc_add_on_frag"; then
 570       AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
 571       libc_add_on_canonical=unknown
 572       libc_add_on_subdirs=
 573       . "$libc_add_on_frag"
 574       test -z "$libc_add_on" || {
 575         configured_add_ons="$configured_add_ons $libc_add_on"
 576         if test "x$libc_add_on_canonical" = xunknown; then
 577           AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
 578         fi
 579         for d in $libc_add_on_subdirs; do
 580           case "$libc_add_on" in
 581           /*) subdir_srcdir="$libc_add_on" ;;
 582           *) subdir_srcdir="\$(..)$libc_add_on" ;;
 583           esac
 584           case "$d" in
 585           .)
 586             d="${libc_add_on_canonical:-$libc_add_on}"
 587             ;;
 588           /*)
 589             subdir_srcdir="$d"
 590             ;;
 591           *)
 592             subdir_srcdir="$subdir_srcdir/$d"
 593             ;;
 594           esac
 595           d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
 596           add_on_subdirs="$add_on_subdirs $d"
 597           test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
 598 $d-srcdir = $subdir_srcdir"
 599         done
 600         for d in $libc_add_on_config_subdirs; do
 601           case "$d" in
 602           /*) AC_MSG_ERROR(dnl
 603 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
 604           esac
 605           if test ! -d "$libc_add_on_srcdir/$d"; then
 606             AC_MSG_ERROR(fragment wants to configure missing directory $d)
 607           fi
 608           case "$libc_add_on" in
 609           /*) AC_MSG_ERROR(dnl
 610 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
 611           esac
 612           subdirs="$subdirs $libc_add_on/$d"
 613         done
 614       }
 615     fi
 616     if test -n "$libc_add_on"; then
 617       LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
 618       use_add_ons="$use_add_ons $libc_add_on"
 619       add_ons_pfx="$add_ons_pfx $libc_add_on/"
 620       test -z "$libc_add_on_canonical" ||
 621       add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
 622     fi
 623   done
 624   # Use echo to strip excess whitespace.
 625   add_ons="`echo $use_add_ons`"
 626 fi
 627 AC_SUBST(add_ons)
 628 AC_SUBST(add_on_subdirs)
 629
 630
 631 ###
 632 ### By using the undocumented --enable-hacker-mode option for configure
 633 ### one can skip this test to make the configuration not fail for unsupported
 634 ### platforms.
 635 ###
 636 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
 637   case "$machine-$host_os" in
 638   *-linux* | *-gnu*)
 639     ;;
 640   *)
 641     AC_MSG_ERROR([
 642 *** The GNU C library is currently unavailable for this platform.
 643 *** If you are interested in seeing glibc on this platform visit
 644 *** the "How to submit a new port" in the wiki:
 645 ***   https://sourceware.org/glibc/wiki/#Development
 646 *** and join the community!])
 647     ;;
 648   esac
 649 fi
 650
 651 # Set base_machine if not set by a preconfigure fragment.
 652 test -n "$base_machine" || base_machine=$machine
 653 AC_SUBST(base_machine)
 654
 655 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
 656 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
 657                    [libc_cv_ssp=yes],
 658                    [libc_cv_ssp=no])
 659 ])
 660
 661 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
 662 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
 663                    [libc_cv_ssp_strong=yes],
 664                    [libc_cv_ssp_strong=no])
 665 ])
 666
 667 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
 668 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
 669                    [libc_cv_ssp_all=yes],
 670                    [libc_cv_ssp_all=no])
 671 ])
 672
 673 stack_protector=
 674 no_stack_protector=
 675 if test "$libc_cv_ssp" = yes; then
 676   no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
 677   AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
 678 fi
 679
 680 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
 681   stack_protector="-fstack-protector"
 682   AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
 683 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
 684   stack_protector="-fstack-protector-all"
 685   AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
 686 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
 687   stack_protector="-fstack-protector-strong"
 688   AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
 689 else
 690   stack_protector="-fno-stack-protector"
 691   AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
 692 fi
 693 AC_SUBST(libc_cv_ssp)
 694 AC_SUBST(stack_protector)
 695 AC_SUBST(no_stack_protector)
 696
 697 if test -n "$stack_protector"; then
 698   dnl Don't run configure tests with stack-protection on, to avoid problems with
 699   dnl bootstrapping.
 700   no_ssp=-fno-stack-protector
 701 else
 702   no_ssp=
 703
 704   if test "$enable_stack_protector" != no; then
 705     AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
 706   fi
 707 fi
 708
 709 # For the multi-arch option we need support in the assembler & linker.
 710 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
 711                libc_cv_ld_gnu_indirect_function, [dnl
 712 cat > conftest.S <<EOF
 713 .type foo,%gnu_indirect_function
 714 foo:
 715 .globl _start
 716 _start:
 717 .globl __start
 718 __start:
 719 .data
 720 #ifdef _LP64
 721 .quad foo
 722 #else
 723 .long foo
 724 #endif
 725 EOF
 726 libc_cv_ld_gnu_indirect_function=no
 727 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
 728             -nostartfiles -nostdlib $no_ssp \
 729             -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
 730   # Do a link to see if the backend supports IFUNC relocs.
 731   $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
 732   LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
 733     libc_cv_ld_gnu_indirect_function=yes
 734   }
 735 fi
 736 rm -f conftest*])
 737
 738 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
 739 AC_CACHE_CHECK([for gcc attribute ifunc support],
 740                libc_cv_gcc_indirect_function, [dnl
 741 cat > conftest.c <<EOF
 742 extern int func (int);
 743 int used_func (int a)
 744 {
 745   return a;
 746 }
 747 static void *resolver ()
 748 {
 749   return &used_func;
 750 }
 751 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
 752 EOF
 753 libc_cv_gcc_indirect_function=no
 754 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
 755    2>&AS_MESSAGE_LOG_FD ; then
 756   if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
 757     libc_cv_gcc_indirect_function=yes
 758   fi
 759 fi
 760 rm -f conftest*])
 761
 762 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
 763   if test x"$multi_arch" = xyes; then
 764     AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
 765   else
 766     multi_arch=no
 767   fi
 768 fi
 769 if test x"$libc_cv_gcc_indirect_function" != xyes &&
 770    test x"$multi_arch" = xyes; then
 771   AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
 772 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
 773 fi
 774 multi_arch_d=
 775 if test x"$multi_arch" != xno; then
 776   multi_arch_d=/multiarch
 777 fi
 778
 779 # Compute the list of sysdep directories for this configuration.
 780 # This can take a while to compute.
 781 sysdep_dir=$srcdir/sysdeps
 782 AC_MSG_CHECKING(sysdep dirs)
 783 dnl We need to use [ and ] for other purposes for a while now.
 784 changequote(,)dnl
 785 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
 786 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
 787
 788 test "x$base_os" != x || case "$os" in
 789 gnu*)
 790   base_os=mach/hurd ;;
 791 linux*)
 792   base_os=unix/sysv ;;
 793 esac
 794
 795 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
 796 tail=$os
 797 ostry=$os
 798 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
 799   ostry="$ostry /$o"
 800   tail=$o
 801 done
 802 o=`echo $tail | sed 's/[0-9]*$//'`
 803 if test $o != $tail; then
 804   ostry="$ostry /$o"
 805 fi
 806 # For linux-gnu, try linux-gnu, then linux.
 807 o=`echo $tail | sed 's/-.*$//'`
 808 if test $o != $tail; then
 809   ostry="$ostry /$o"
 810 fi
 811
 812 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
 813 base=
 814 tail=$base_os
 815 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
 816   set $b
 817   base="$base /$1"
 818   tail="$2"
 819 done
 820
 821 # For sparc/sparc32, try sparc/sparc32 and then sparc.
 822 mach=
 823 tail=$machine${submachine:+/$submachine}
 824 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
 825   set $m
 826   # Prepend the machine's FPU directory unless --without-fp.
 827   if test "$with_fp" = yes; then
 828     maybe_fpu=/fpu
 829   else
 830     maybe_fpu=/nofpu
 831   fi
 832   # For each machine term, try it with and then without /multiarch.
 833   for try_fpu in $maybe_fpu ''; do
 834     for try_multi in $multi_arch_d ''; do
 835       mach="$mach /$1$try_fpu$try_multi"
 836     done
 837   done
 838   tail="$2"
 839 done
 840
 841 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 842 changequote([,])dnl
 843
 844 # Find what sysdep directories exist.
 845 sysnames_add_ons=
 846 sysnames=
 847 for b in $base ''; do
 848   for m0 in $mach ''; do
 849     for v in /$vendor ''; do
 850       test "$v" = / && continue
 851       for o in /$ostry ''; do
 852         test "$o" = / && continue
 853         for m in $mach ''; do
 854           for d in $add_ons_pfx ''; do
 855             for a in $add_ons_sfx ''; do
 856               try_suffix="$m0$b$v$o$m"
 857               if test -n "$try_suffix"; then
 858                 try_srcdir="${srcdir}/"
 859                 case "$d" in
 860                 /*) try_srcdir= ;;
 861                 esac
 862                 try="${d}sysdeps$try_suffix$a"
 863                 test -n "$enable_debug_configure" &&
 864                 echo "$0 [DEBUG]: try $try" >&2
 865                 if test -d "$try_srcdir$try"; then
 866                   sysnames="$sysnames $try"
 867                   { test -n "$o" || test -n "$b"; } && os_used=t
 868                   { test -n "$m" || test -n "$m0"; } && machine_used=t
 869                   case x${m0:-$m} in
 870                   x*/$submachine) submachine_used=t ;;
 871                   esac
 872                   if test -n "$d"; then
 873                     case "$sysnames_add_ons" in
 874                     *" $d "*) ;;
 875                     *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 876                     esac
 877                   fi
 878                 fi
 879               fi
 880             done
 881           done
 882         done
 883       done
 884     done
 885   done
 886 done
 887
 888 # If the assembler supports gnu_indirect_function symbol type and the
 889 # architecture supports multi-arch, we enable multi-arch by default.
 890 case $sysnames_add_ons$sysnames in
 891 *"$multi_arch_d"*)
 892   ;;
 893 *)
 894   test x"$multi_arch" = xdefault && multi_arch=no
 895   ;;
 896 esac
 897 if test x"$multi_arch" != xno; then
 898   AC_DEFINE(USE_MULTIARCH)
 899 fi
 900 AC_SUBST(multi_arch)
 901
 902 if test -z "$os_used" && test "$os" != none; then
 903   AC_MSG_ERROR(Operating system $os is not supported.)
 904 fi
 905 if test -z "$machine_used" && test "$machine" != none; then
 906   AC_MSG_ERROR(The $machine is not supported.)
 907 fi
 908 if test -z "$submachine_used" && test -n "$submachine"; then
 909   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
 910 fi
 911 AC_SUBST(submachine)
 912
 913 # We have now validated the configuration.
 914
 915 # Expand the list of system names into a full list of directories
 916 # from each element's parent name and Implies file (if present).
 917 set $sysnames
 918 names=
 919 while test $# -gt 0; do
 920   name=$1
 921   shift
 922
 923   case " $names " in *" $name "*)
 924     # Already in the list.
 925     continue
 926   esac
 927
 928   # Report each name as we discover it, so there is no long pause in output.
 929   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 930
 931   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
 932
 933   case $name in
 934     /*) xsrcdir= ;;
 935     *)  xsrcdir=$srcdir/ ;;
 936   esac
 937   test -n "$enable_debug_configure" &&
 938   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
 939
 940   for implies_file in Implies Implies-before Implies-after; do
 941     implies_type=`echo $implies_file | sed s/-/_/`
 942     eval ${implies_type}=
 943     if test -f $xsrcdir$name/$implies_file; then
 944       # Collect more names from the `Implies' file (removing comments).
 945       implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
 946       for x in $implied_candidate; do
 947         found=no
 948         if test -d $xsrcdir$name_base/$x; then
 949           eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
 950           found=yes
 951         fi
 952         for d in $add_ons_pfx ''; do
 953           try="${d}sysdeps/$x"
 954           case $d in
 955            /*) try_srcdir= ;;
 956            *) try_srcdir=$srcdir/ ;;
 957           esac
 958           test -n "$enable_debug_configure" &&
 959            echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
 960           if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
 961           then
 962             eval "${implies_type}=\"\$${implies_type} \$try\""
 963             found=yes
 964             case "$sysnames_add_ons" in
 965             *" $d "*) ;;
 966             *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 967             esac
 968           fi
 969         done
 970         if test $found = no; then
 971           AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
 972         fi
 973       done
 974     fi
 975   done
 976
 977   # Add NAME to the list of names.
 978   names="$names $name"
 979
 980   # Find the parent of NAME, using the empty string if it has none.
 981 changequote(,)dnl
 982   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
 983 changequote([,])dnl
 984
 985   test -n "$enable_debug_configure" &&
 986     echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
 987 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
 988
 989   # Add the names implied by NAME, and NAME's parent (if it has one), to
 990   # the list of names to be processed (the argument list).  We prepend the
 991   # implied names to the list and append the parent.  We want implied
 992   # directories to come before further directories inferred from the
 993   # configuration components; this ensures that for sysv4, unix/common
 994   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
 995   # after sysv4).
 996   sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
 997   test -n "$sysnames" && set $sysnames
 998 done
 999
1000 # Add the default directories.
1001 default_sysnames="sysdeps/generic"
1002 sysnames="$names $default_sysnames"
1003 AC_SUBST(sysnames)
1004 # The other names were emitted during the scan.
1005 AC_MSG_RESULT($default_sysnames)
1006
1007 # Collect the list of add-ons that supply partial sysdeps trees.
1008 sysdeps_add_ons=
1009 for add_on in $add_ons; do
1010   case "$add_on" in
1011   /*) xsrcdir= ;;
1012   *) xsrcdir="$srcdir/" ;;
1013   esac
1014
1015   test -d "$xsrcdir$add_on/sysdeps" || {
1016     case "$configured_add_ons " in
1017     *" $add_on "*) ;;
1018     *|'')
1019       AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
1020       ;;
1021     esac
1022     continue
1023   }
1024
1025   sysdeps_add_ons="$sysdeps_add_ons $add_on"
1026   case "$sysnames_add_ons" in
1027   *" $add_on/ "*) ;;
1028   *|'')
1029     AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
1030     continue ;;
1031   esac
1032
1033   found=no
1034   for d in $sysnames; do
1035     case "$d" in
1036     $add_on/sysdeps/*) ;;
1037     *) continue ;;
1038     esac
1039     (cd "$xsrcdir$d" && for f in *[[!~]]; do
1040        case "$f" in
1041        sys|bits)
1042          for ff in $f/*.h; do
1043            test -d "$ff" || { test -e "$ff" && exit 88; }
1044          done
1045          ;;
1046        *)
1047          test -d "$f" || { test -e "$f" && exit 88; }
1048          ;;
1049        esac
1050      done)
1051     if test $? -eq 88; then
1052       found=yes
1053       break
1054     fi
1055   done
1056   if test $found = no; then
1057     AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
1058   fi
1059 done
1060 AC_SUBST(sysdeps_add_ons)
1061
1062
1063 ### Locate tools.
1064
1065 AC_PROG_INSTALL
1066 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
1067   # The makefiles need to use a different form to find it in $srcdir.
1068   INSTALL='\$(..)./scripts/install-sh -c'
1069 fi
1070 AC_PROG_LN_S
1071
1072 LIBC_PROG_BINUTILS
1073
1074 # Accept binutils 2.22 or newer.
1075 AC_CHECK_PROG_VER(AS, $AS, --version,
1076                   [GNU assembler.* \([0-9]*\.[0-9.]*\)],
1077                   [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1078                   AS=: critic_missing="$critic_missing as")
1079 AC_CHECK_PROG_VER(LD, $LD, --version,
1080                   [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
1081                   [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1082                   LD=: critic_missing="$critic_missing ld")
1083
1084 # These programs are version sensitive.
1085 AC_CHECK_TOOL_PREFIX
1086 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1087   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1088   [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1089
1090 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1091   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1092   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1093   MSGFMT=: aux_missing="$aux_missing msgfmt")
1094 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1095   [GNU texinfo.* \([0-9][0-9.]*\)],
1096   [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1097   MAKEINFO=: aux_missing="$aux_missing makeinfo")
1098 AC_CHECK_PROG_VER(SED, sed, --version,
1099   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1100   [3.0[2-9]*|3.[1-9]*|[4-9]*],
1101   SED=: aux_missing="$aux_missing sed")
1102 AC_CHECK_PROG_VER(AWK, gawk, --version,
1103   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1104   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1105
1106 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1107 AC_TRY_COMPILE([], [
1108 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
1109 #error insufficient compiler
1110 #endif],
1111                [libc_cv_compiler_ok=yes],
1112                [libc_cv_compiler_ok=no])])
1113 AS_IF([test $libc_cv_compiler_ok != yes],
1114       [critic_missing="$critic_missing compiler"])
1115
1116 AC_CHECK_TOOL(NM, nm, false)
1117
1118 if test "x$maintainer" = "xyes"; then
1119   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1120   case "x$AUTOCONF" in
1121   xno|x|x:) AUTOCONF=no ;;
1122   *)
1123     AC_CACHE_CHECK(dnl
1124   whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1125     if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1126       libc_cv_autoconf_works=yes
1127     else
1128       libc_cv_autoconf_works=no
1129     fi])
1130     test $libc_cv_autoconf_works = yes || AUTOCONF=no
1131     ;;
1132   esac
1133   if test "x$AUTOCONF" = xno; then
1134     aux_missing="$aux_missing autoconf"
1135   fi
1136 else
1137   AUTOCONF=no
1138 fi
1139
1140 # Check for python3 if available, or else python.
1141 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1142 case "x$PYTHON_PROG" in
1143 xno|x|x:) PYTHON_PROG=no ;;
1144 *) ;;
1145 esac
1146
1147 if test "x$PYTHON_PROG" = xno; then
1148   aux_missing="$aux_missing python"
1149 else
1150   PYTHON="$PYTHON_PROG -B"
1151   AC_SUBST(PYTHON)
1152 fi
1153
1154 test -n "$critic_missing" && AC_MSG_ERROR([
1155 *** These critical programs are missing or too old:$critic_missing
1156 *** Check the INSTALL file for required versions.])
1157
1158 test -n "$aux_missing" && AC_MSG_WARN([
1159 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1160 *** some features or tests will be disabled.
1161 *** Check the INSTALL file for required versions.])
1162
1163 # if using special system headers, find out the compiler's sekrit
1164 # header directory and add that to the list.  NOTE: Only does the right
1165 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
1166 if test -n "$sysheaders"; then
1167   SYSINCLUDES=-nostdinc
1168   for d in include include-fixed; do
1169     i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1170     SYSINCLUDES="$SYSINCLUDES -isystem $i"
1171   done
1172   SYSINCLUDES="$SYSINCLUDES \
1173 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1174   if test -n "$CXX"; then
1175     CXX_SYSINCLUDES=
1176     for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1177     | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1178       test "x$cxxheaders" != x &&
1179       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1180     done
1181   fi
1182 fi
1183 AC_SUBST(SYSINCLUDES)
1184 AC_SUBST(CXX_SYSINCLUDES)
1185
1186 # Obtain some C++ header file paths.  This is used to make a local
1187 # copy of those headers in Makerules.
1188 if test -n "$CXX"; then
1189   find_cxx_header () {
1190     echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1191          | sed -n "\,$1:,{s/:\$//;p}"
1192   }
1193   CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1194   CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1195   CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1196 fi
1197 AC_SUBST(CXX_CSTDLIB_HEADER)
1198 AC_SUBST(CXX_CMATH_HEADER)
1199 AC_SUBST(CXX_BITS_STD_ABS_H)
1200
1201 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1202 # since this would lead to problems installing/building glibc.
1203 # LD_LIBRARY_PATH contains the current directory if one of the following
1204 # is true:
1205 # - one of the terminals (":" and ";") is the first or last sign
1206 # - two terminals occur directly after each other
1207 # - the path contains an element with a dot in it
1208 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1209 changequote(,)dnl
1210 case ${LD_LIBRARY_PATH} in
1211   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1212     ld_library_path_setting="contains current directory"
1213     ;;
1214   *)
1215     ld_library_path_setting="ok"
1216     ;;
1217 esac
1218 changequote([,])dnl
1219 AC_MSG_RESULT($ld_library_path_setting)
1220 if test "$ld_library_path_setting" != "ok"; then
1221 AC_MSG_ERROR([
1222 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1223 *** building glibc. Please change the environment variable
1224 *** and run configure again.])
1225 fi
1226
1227 AC_PATH_PROG(BASH_SHELL, bash, no)
1228
1229 AC_PATH_PROG(PERL, perl, no)
1230 if test "$PERL" != no &&
1231    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1232   PERL=no
1233 fi
1234 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1235              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1236 AC_CHECK_PROG_VER(BISON, bison, --version,
1237                   [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1238                   [2.7*|[3-9].*|[1-9][0-9]*],
1239                   BISON=no)
1240
1241 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1242 cat > conftest.s <<EOF
1243 .text
1244 foo:
1245 .set glibc_conftest_frobozz,foo
1246 .globl glibc_conftest_frobozz
1247 EOF
1248 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1249 # (but it doesn't work), so we must do a linking check to be sure.
1250 cat > conftest1.c <<\EOF
1251 extern int glibc_conftest_frobozz;
1252 void _start() { glibc_conftest_frobozz = 1; }
1253 EOF
1254 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1255             -nostartfiles -nostdlib $no_ssp \
1256             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1257   libc_cv_asm_set_directive=yes
1258 else
1259   libc_cv_asm_set_directive=no
1260 fi
1261 rm -f conftest*])
1262 if test $libc_cv_asm_set_directive = yes; then
1263   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1264 fi
1265
1266 AC_CACHE_CHECK(linker support for protected data symbol,
1267                libc_cv_protected_data,
1268                [cat > conftest.c <<EOF
1269                 int bar __attribute__ ((visibility ("protected"))) = 1;
1270 EOF
1271                 libc_cv_protected_data=no
1272                 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1273                   cat > conftest.c <<EOF
1274                   extern int bar;
1275                   int main (void) { return bar; }
1276 EOF
1277                   if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1278                     libc_cv_protected_data=yes
1279                   fi
1280                 fi
1281                 rm -f conftest.*
1282                ])
1283 AC_SUBST(libc_cv_protected_data)
1284
1285 AC_CACHE_CHECK(for broken __attribute__((alias())),
1286                libc_cv_broken_alias_attribute,
1287                [cat > conftest.c <<EOF
1288                extern int foo (int x) __asm ("xyzzy");
1289                int bar (int x) { return x; }
1290                extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1291                extern int dfoo;
1292                extern __typeof (dfoo) dfoo __asm ("abccb");
1293                int dfoo = 1;
1294 EOF
1295                libc_cv_broken_alias_attribute=yes
1296                if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1297                  if grep 'xyzzy' conftest.s >/dev/null &&
1298                     grep 'abccb' conftest.s >/dev/null; then
1299                    libc_cv_broken_alias_attribute=no
1300                  fi
1301                fi
1302                rm -f conftest.c conftest.s
1303                ])
1304 if test $libc_cv_broken_alias_attribute = yes; then
1305   AC_MSG_ERROR(working alias attribute support required)
1306 fi
1307
1308 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1309                libc_cv_have_sdata_section,
1310                [echo "int i;" > conftest.c
1311                 libc_cv_have_sdata_section=no
1312                 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1313                    | grep '\.sdata' >/dev/null; then
1314                   libc_cv_have_sdata_section=yes
1315                 fi
1316                 rm -f conftest.c conftest.so
1317                ])
1318 if test $libc_cv_have_sdata_section = yes; then
1319   AC_DEFINE(HAVE_SDATA_SECTION)
1320 fi
1321
1322 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1323                libc_cv_ctors_header, [dnl
1324   libc_cv_ctors_header=yes
1325   LIBC_TRY_LINK_STATIC([
1326 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1327 __attribute__ ((destructor))  void dtor (void) { asm (""); }
1328 ],
1329               [dnl
1330       AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1331         { gsub(/\@<:@ */, "@<:@") }
1332         $2 == ".ctors" || $2 == ".dtors" {
1333           size = strtonum("0x" $6)
1334           align = strtonum("0x" $NF)
1335           seen@<:@$2@:>@ = 1
1336           stub@<:@$2@:>@ = size == align * 2
1337         }
1338         END {
1339           ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1340           dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1341           exit ((ctors_ok && dtors_ok) ? 0 : 1)
1342         }
1343       '], [libc_cv_ctors_header=no])
1344     ], [dnl
1345       AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1346     ])
1347 ])
1348 if test $libc_cv_ctors_header = no; then
1349   AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1350 fi
1351
1352 AC_CACHE_CHECK(for libunwind-support in compiler,
1353                libc_cv_cc_with_libunwind, [
1354   cat > conftest.c <<EOF
1355 int main (void) { return 0; }
1356 EOF
1357   if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1358      conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1359     libc_cv_cc_with_libunwind=yes
1360   else
1361     libc_cv_cc_with_libunwind=no
1362   fi
1363   rm -f conftest*])
1364 AC_SUBST(libc_cv_cc_with_libunwind)
1365 if test $libc_cv_cc_with_libunwind = yes; then
1366   AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1367 fi
1368
1369 ASFLAGS_config=
1370 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1371                libc_cv_as_noexecstack, [dnl
1372 cat > conftest.c <<EOF
1373 void foo (void) { }
1374 EOF
1375 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1376                    -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1377    && grep .note.GNU-stack conftest.s >/dev/null \
1378    && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1379                       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1380 then
1381   libc_cv_as_noexecstack=yes
1382 else
1383   libc_cv_as_noexecstack=no
1384 fi
1385 rm -f conftest*])
1386 if test $libc_cv_as_noexecstack = yes; then
1387   ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1388 fi
1389 AC_SUBST(ASFLAGS_config)
1390
1391 AC_CACHE_CHECK(for -z combreloc,
1392                libc_cv_z_combreloc, [dnl
1393 cat > conftest.c <<EOF
1394 extern int bar (int);
1395 extern int mumble;
1396 int foo (void) { return bar (mumble); }
1397 EOF
1398 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1399                         -fPIC -shared $no_ssp -o conftest.so conftest.c
1400                         -nostdlib -nostartfiles
1401                         -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1402 then
1403 dnl The following test is a bit weak.  We must use a tool which can test
1404 dnl cross-platform since the gcc used can be a cross compiler.  Without
1405 dnl introducing new options this is not easily doable.  Instead use a tool
1406 dnl which always is cross-platform: readelf.  To detect whether -z combreloc
1407 dnl look for a section named .rel.dyn or .rela.dyn.
1408   if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1409     libc_cv_z_combreloc=yes
1410   else
1411     libc_cv_z_combreloc=no
1412   fi
1413 else
1414   libc_cv_z_combreloc=no
1415 fi
1416 rm -f conftest*])
1417 if test "$libc_cv_z_combreloc" = yes; then
1418   AC_DEFINE(HAVE_Z_COMBRELOC)
1419 fi
1420 AC_SUBST(libc_cv_z_combreloc)
1421
1422 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1423                     [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1424 AC_SUBST(libc_cv_z_execstack)
1425
1426 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1427 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1428 ])
1429
1430 AC_SUBST(libc_cv_fpie)
1431
1432 AC_CACHE_CHECK(for --hash-style option,
1433                libc_cv_hashstyle, [dnl
1434 cat > conftest.c <<EOF
1435 int _start (void) { return 42; }
1436 EOF
1437 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1438                             -fPIC -shared -o conftest.so conftest.c
1439                             -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1440 then
1441   libc_cv_hashstyle=yes
1442 else
1443   libc_cv_hashstyle=no
1444 fi
1445 rm -f conftest*])
1446 AC_SUBST(libc_cv_hashstyle)
1447
1448 # The linker's default -shared behavior is good enough if it
1449 # does these things that our custom linker scripts ensure that
1450 # all allocated NOTE sections come first.
1451 if test "$use_default_link" = default; then
1452   AC_CACHE_CHECK([for sufficient default -shared layout],
1453                   libc_cv_use_default_link, [dnl
1454   libc_cv_use_default_link=no
1455   cat > conftest.s <<\EOF
1456           .section .note.a,"a",%note
1457           .balign 4
1458           .long 4,4,9
1459           .string "GNU"
1460           .string "foo"
1461           .section .note.b,"a",%note
1462           .balign 4
1463           .long 4,4,9
1464           .string "GNU"
1465           .string "bar"
1466 EOF
1467   if AC_TRY_COMMAND([dnl
1468   ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1469        ac_try=`$READELF -S conftest.so | sed -n \
1470          ['${x;p;}
1471           s/^ *\[ *[1-9][0-9]*\]  *\([^ ][^ ]*\)  *\([^ ][^ ]*\) .*$/\2 \1/
1472           t a
1473           b
1474           : a
1475           H']`
1476   then
1477     libc_seen_a=no libc_seen_b=no
1478     set -- $ac_try
1479     while test $# -ge 2 -a "$1" = NOTE; do
1480       case "$2" in
1481       .note.a) libc_seen_a=yes ;;
1482       .note.b) libc_seen_b=yes ;;
1483       esac
1484       shift 2
1485     done
1486     case "$libc_seen_a$libc_seen_b" in
1487     yesyes)
1488       libc_cv_use_default_link=yes
1489       ;;
1490     *)
1491       echo >&AS_MESSAGE_LOG_FD "\
1492 $libc_seen_a$libc_seen_b from:
1493 $ac_try"
1494       ;;
1495     esac
1496   fi
1497   rm -f conftest*])
1498   use_default_link=$libc_cv_use_default_link
1499 fi
1500
1501 AC_CACHE_CHECK(for GLOB_DAT reloc,
1502                libc_cv_has_glob_dat, [dnl
1503 cat > conftest.c <<EOF
1504 extern int mumble;
1505 int foo (void) { return mumble; }
1506 EOF
1507 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1508                         -fPIC -shared -o conftest.so conftest.c
1509                         -nostdlib -nostartfiles $no_ssp
1510                         1>&AS_MESSAGE_LOG_FD])
1511 then
1512 dnl look for GLOB_DAT relocation.
1513   if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1514     libc_cv_has_glob_dat=yes
1515   else
1516     libc_cv_has_glob_dat=no
1517   fi
1518 else
1519   libc_cv_has_glob_dat=no
1520 fi
1521 rm -f conftest*])
1522 AC_SUBST(libc_cv_has_glob_dat)
1523
1524 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1525 if libc_cv_output_format=`
1526 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1527 then
1528   :
1529 else
1530   libc_cv_output_format=
1531 fi
1532 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1533 AC_SUBST(libc_cv_output_format)
1534
1535 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1536 cat > conftest.c <<EOF
1537 int foo;
1538 EOF
1539 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1540                             conftest.c 1>&AS_MESSAGE_LOG_FD])
1541 then
1542   libc_cv_fno_toplevel_reorder=yes
1543 else
1544   libc_cv_fno_toplevel_reorder=no
1545 fi
1546 rm -f conftest*])
1547 if test $libc_cv_fno_toplevel_reorder = yes; then
1548   fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1549 else
1550   fno_unit_at_a_time=-fno-unit-at-a-time
1551 fi
1552 AC_SUBST(fno_unit_at_a_time)
1553
1554 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1555 [dnl
1556 cat > conftest.c <<EOF
1557 __thread int i;
1558 void foo (void)
1559 {
1560   i = 10;
1561 }
1562 EOF
1563 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1564                    conftest.c 1>&AS_MESSAGE_LOG_FD])
1565 then
1566   libc_cv_mtls_dialect_gnu2=yes
1567 else
1568   libc_cv_mtls_dialect_gnu2=no
1569 fi
1570 rm -f conftest*])
1571 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1572 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1573
1574 AC_CACHE_CHECK(whether cc puts quotes around section names,
1575                libc_cv_have_section_quotes,
1576                [cat > conftest.c <<EOF
1577                 static const int foo
1578                 __attribute__ ((section ("bar"))) = 1;
1579 EOF
1580                 if ${CC-cc} -S conftest.c -o conftest.s; then
1581                   if grep '\.section.*"bar"' conftest.s >/dev/null; then
1582                     libc_cv_have_section_quotes=yes
1583                   else
1584                     libc_cv_have_section_quotes=no
1585                   fi
1586                 else
1587                   libc_cv_have_section_quotes=unknown
1588                 fi
1589                 rm -f conftest.{c,s}
1590                 ])
1591 if test $libc_cv_have_section_quotes = yes; then
1592   AC_DEFINE(HAVE_SECTION_QUOTES)
1593 fi
1594
1595 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1596 cat > conftest.c <<\EOF
1597 void zero (void *x)
1598 {
1599   __builtin_memset (x, 0, 1000);
1600 }
1601 EOF
1602 dnl
1603 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1604 then
1605   libc_cv_gcc_builtin_memset=no
1606 else
1607   libc_cv_gcc_builtin_memset=yes
1608 fi
1609 rm -f conftest* ])
1610 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1611   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1612 fi
1613
1614 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1615 cat > conftest.c <<\EOF
1616 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1617 char *foo (const char *a, const char *b)
1618 {
1619   return __builtin_strstr (a, b);
1620 }
1621 EOF
1622 dnl
1623 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1624 then
1625   libc_cv_gcc_builtin_redirection=yes
1626 else
1627   libc_cv_gcc_builtin_redirection=no
1628 fi
1629 rm -f conftest* ])
1630 if test "$libc_cv_gcc_builtin_redirection" = no; then
1631   AC_MSG_ERROR([support for the symbol redirection needed])
1632 fi
1633
1634 dnl Determine how to disable generation of FMA instructions.
1635 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1636                libc_cv_cc_nofma, [dnl
1637 libc_cv_cc_nofma=
1638 for opt in -ffp-contract=off -mno-fused-madd; do
1639   LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1640 done])
1641 AC_SUBST(libc_cv_cc_nofma)
1642
1643 if test -n "$submachine"; then
1644   AC_CACHE_CHECK([for compiler option for CPU variant],
1645                  libc_cv_cc_submachine, [dnl
1646   libc_cv_cc_submachine=no
1647   for opt in "-march=$submachine" "-mcpu=$submachine"; do
1648     LIBC_TRY_CC_OPTION([$opt], [
1649       libc_cv_cc_submachine="$opt"
1650       break], [])
1651   done])
1652   if test "x$libc_cv_cc_submachine" = xno; then
1653     AC_MSG_ERROR([${CC-cc} does not support $submachine])
1654   fi
1655 fi
1656 AC_SUBST(libc_cv_cc_submachine)
1657
1658 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1659 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1660 cat > conftest.c <<EOF
1661 void
1662 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1663 foo (void) {}
1664 EOF
1665 libc_cv_cc_loop_to_function=no
1666 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1667 then
1668   libc_cv_cc_loop_to_function=yes
1669 fi
1670 rm -f conftest*])
1671 if test $libc_cv_cc_loop_to_function = yes; then
1672   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1673 fi
1674 AC_SUBST(libc_cv_cc_loop_to_function)
1675
1676 dnl Check whether we have the gd library available.
1677 AC_MSG_CHECKING(for libgd)
1678 if test "$with_gd" != "no"; then
1679   old_CFLAGS="$CFLAGS"
1680   CFLAGS="$CFLAGS $libgd_include"
1681   old_LDFLAGS="$LDFLAGS"
1682   LDFLAGS="$LDFLAGS $libgd_ldflags"
1683   old_LIBS="$LIBS"
1684   LIBS="$LIBS -lgd -lpng -lz -lm"
1685   AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1686   CFLAGS="$old_CFLAGS"
1687   LDFLAGS="$old_LDFLAGS"
1688   LIBS="$old_LIBS"
1689 else
1690   LIBGD=no
1691 fi
1692 AC_MSG_RESULT($LIBGD)
1693 AC_SUBST(LIBGD)
1694
1695 # SELinux detection
1696 if test x$with_selinux = xno ; then
1697   have_selinux=no;
1698 else
1699   # See if we have the SELinux library
1700   AC_CHECK_LIB(selinux, is_selinux_enabled,
1701                have_selinux=yes, have_selinux=no)
1702   if test x$with_selinux = xyes ; then
1703     if test x$have_selinux = xno ; then
1704       AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1705     fi
1706   fi
1707 fi
1708 # Check if we're building with SELinux support.
1709 if test "x$have_selinux" = xyes; then
1710   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1711
1712   # See if we have the libaudit library
1713   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1714                have_libaudit=yes, have_libaudit=no)
1715   if test "x$have_libaudit" = xyes; then
1716     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1717   fi
1718   AC_SUBST(have_libaudit)
1719
1720   # See if we have the libcap library
1721   AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1722   if test "x$have_libcap" = xyes; then
1723     AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1724   fi
1725   AC_SUBST(have_libcap)
1726 fi
1727 AC_SUBST(have_selinux)
1728
1729 CPPUNDEFS=
1730 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1731 dnl Since we are building the implementations of the fortified functions here,
1732 dnl having the macro defined interacts very badly.
1733 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1734 [AC_TRY_COMPILE([], [
1735 #ifdef _FORTIFY_SOURCE
1736 # error bogon
1737 #endif],
1738                 [libc_cv_predef_fortify_source=no],
1739                 [libc_cv_predef_fortify_source=yes])])
1740 if test $libc_cv_predef_fortify_source = yes; then
1741   CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1742 fi
1743 AC_SUBST(CPPUNDEFS)
1744
1745 # Some linkers on some architectures support __ehdr_start but with
1746 # bugs.  Make sure usage of it does not create relocations in the
1747 # output (as the linker should resolve them all for us).
1748 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1749                libc_cv_ehdr_start, [
1750 old_CFLAGS="$CFLAGS"
1751 old_LDFLAGS="$LDFLAGS"
1752 old_LIBS="$LIBS"
1753 CFLAGS="$CFLAGS -fPIC"
1754 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1755 LIBS=
1756 AC_LINK_IFELSE([AC_LANG_SOURCE([
1757 typedef struct {
1758   char foo;
1759   long val;
1760 } Ehdr;
1761 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1762 long ehdr (void) { return __ehdr_start.val; }
1763 ])],
1764                [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1765                   libc_cv_ehdr_start=broken
1766                 else
1767                   libc_cv_ehdr_start=yes
1768                 fi], [libc_cv_ehdr_start=no])
1769 CFLAGS="$old_CFLAGS"
1770 LDFLAGS="$old_LDFLAGS"
1771 LIBS="$old_LIBS"
1772 ])
1773 if test "$libc_cv_ehdr_start" = yes; then
1774   AC_DEFINE([HAVE_EHDR_START])
1775 elif test "$libc_cv_ehdr_start" = broken; then
1776   AC_MSG_WARN([linker is broken -- you should upgrade])
1777 fi
1778
1779 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1780                libc_cv_builtin_trap, [dnl
1781 libc_cv_builtin_trap=no
1782 AC_TRY_COMPILE([], [__builtin_trap ()], [
1783 libc_undefs=`$NM -u conftest.o |
1784   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1785     2>&AS_MESSAGE_LOG_FD` || {
1786   AC_MSG_ERROR([confusing output from $NM -u])
1787 }
1788 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1789 if test -z "$libc_undefs"; then
1790   libc_cv_builtin_trap=yes
1791 fi])])
1792 if test $libc_cv_builtin_trap = yes; then
1793   AC_DEFINE([HAVE_BUILTIN_TRAP])
1794 fi
1795
1796 dnl C++ feature tests.
1797 AC_LANG_PUSH([C++])
1798
1799 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1800                libc_cv_cxx_thread_local, [
1801 old_CXXFLAGS="$CXXFLAGS"
1802 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1803 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1804 #include <thread>
1805
1806 // Compiler support.
1807 struct S
1808 {
1809   S ();
1810   ~S ();
1811 };
1812 thread_local S s;
1813 S * get () { return &s; }
1814
1815 // libstdc++ support.
1816 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1817 #error __cxa_thread_atexit_impl not supported
1818 #endif
1819 ])],
1820                [libc_cv_cxx_thread_local=yes],
1821                [libc_cv_cxx_thread_local=no])
1822 CXXFLAGS="$old_CXXFLAGS"
1823 ])
1824 AC_SUBST(libc_cv_cxx_thread_local)
1825
1826 AC_LANG_POP([C++])
1827 dnl End of C++ feature tests.
1828
1829 ### End of automated tests.
1830 ### Now run sysdeps configure fragments.
1831
1832 # They also can set these variables.
1833 use_ldconfig=no
1834 ldd_rewrite_script=no
1835 libc_cv_sysconfdir=$sysconfdir
1836 libc_cv_localstatedir=$localstatedir
1837 libc_cv_gcc_unwind_find_fde=no
1838 libc_cv_idn=no
1839
1840 # Iterate over all the sysdep directories we will use, running their
1841 # configure fragments.
1842 for dir in $sysnames; do
1843   case $dir in
1844     /*) dest=$dir ;;
1845     *)  dest=$srcdir/$dir ;;
1846   esac
1847   if test -r $dest/configure; then
1848     AC_MSG_RESULT(running configure fragment for $dir)
1849     . $dest/configure
1850   fi
1851 done
1852
1853 if test x"$build_mathvec" = xnotset; then
1854   build_mathvec=no
1855 fi
1856 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1857
1858 AC_SUBST(libc_extra_cflags)
1859 AC_SUBST(libc_extra_cppflags)
1860
1861 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1862   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1863 fi
1864 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1865
1866 # A sysdeps configure fragment can reset this if IFUNC is not actually
1867 # usable even though the assembler knows how to generate the symbol type.
1868 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1869   AC_DEFINE(HAVE_IFUNC)
1870 fi
1871
1872 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1873   AC_DEFINE(HAVE_GCC_IFUNC)
1874 fi
1875
1876 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1877 # configure fragment can override the value to prevent this AC_DEFINE.
1878 AC_SUBST(use_nscd)
1879 if test "x$use_nscd" != xno; then
1880   AC_DEFINE([USE_NSCD])
1881 fi
1882 if test "x$build_nscd" = xdefault; then
1883   build_nscd=$use_nscd
1884 fi
1885
1886 AC_SUBST(libc_cv_slibdir)
1887 AC_SUBST(libc_cv_rtlddir)
1888 AC_SUBST(libc_cv_complocaledir)
1889 AC_SUBST(libc_cv_sysconfdir)
1890 AC_SUBST(libc_cv_localstatedir)
1891 AC_SUBST(libc_cv_rootsbindir)
1892
1893 if test x$use_ldconfig = xyes; then
1894   AC_DEFINE(USE_LDCONFIG)
1895 fi
1896 AC_SUBST(use_ldconfig)
1897 AC_SUBST(ldd_rewrite_script)
1898
1899 AC_SUBST(static)
1900 AC_SUBST(shared)
1901
1902 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1903 [libc_cv_pic_default=yes
1904 cat > conftest.c <<EOF
1905 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1906 # error PIC is default.
1907 #endif
1908 EOF
1909 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1910   libc_cv_pic_default=no
1911 fi
1912 rm -f conftest.*])
1913 AC_SUBST(libc_cv_pic_default)
1914
1915 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1916 [libc_cv_pie_default=yes
1917 cat > conftest.c <<EOF
1918 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1919 # error PIE is default.
1920 #endif
1921 EOF
1922 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1923   libc_cv_pie_default=no
1924 fi
1925 rm -f conftest.*])
1926 AC_SUBST(libc_cv_pie_default)
1927
1928 AC_SUBST(profile)
1929 AC_SUBST(static_nss)
1930
1931 AC_SUBST(DEFINES)
1932
1933 dnl See sysdeps/mach/configure.ac for this variable.
1934 AC_SUBST(mach_interface_list)
1935
1936 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1937 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1938 AC_SUBST(VERSION)
1939 AC_SUBST(RELEASE)
1940
1941 AC_CONFIG_FILES([config.make Makefile])
1942 AC_CONFIG_COMMANDS([default],[[
1943 case $CONFIG_FILES in *config.make*)
1944 echo "$config_vars" >> config.make;;
1945 esac
1946 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1947 AC_OUTPUT