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 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
  61                [libc_cv_cxx_link_ok=yes],
  62                [libc_cv_cxx_link_ok=no])
  63 AC_LANG_POP([C++])])
  64 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
  65
  66 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
  67   AC_MSG_ERROR([you must configure in a separate build directory])
  68 fi
  69
  70 # This will get text that should go into config.make.
  71 config_vars=
  72
  73 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
  74 AC_ARG_WITH([gd],
  75             AC_HELP_STRING([--with-gd=DIR],
  76                            [find libgd include dir and library with prefix DIR]),
  77             [dnl
  78 case "$with_gd" in
  79 yes|''|no) ;;
  80 *) libgd_include="-I$withval/include"
  81    libgd_ldflags="-L$withval/lib" ;;
  82 esac
  83 ])
  84 AC_ARG_WITH([gd-include],
  85             AC_HELP_STRING([--with-gd-include=DIR],
  86                            [find libgd include files in DIR]),
  87             [dnl
  88 case "$with_gd_include" in
  89 ''|no) ;;
  90 *) libgd_include="-I$withval" ;;
  91 esac
  92 ])
  93 AC_ARG_WITH([gd-lib],
  94             AC_HELP_STRING([--with-gd-lib=DIR],
  95                            [find libgd library files in DIR]),
  96             [dnl
  97 case "$with_gd_lib" in
  98 ''|no) ;;
  99 *) libgd_ldflags="-L$withval" ;;
 100 esac
 101 ])
 102
 103 if test -n "$libgd_include"; then
 104   config_vars="$config_vars
 105 CFLAGS-memusagestat.c = $libgd_include"
 106 fi
 107 if test -n "$libgd_ldflags"; then
 108   config_vars="$config_vars
 109 libgd-LDFLAGS = $libgd_ldflags"
 110 fi
 111
 112 dnl Arguments to specify presence of other packages/features.
 113 AC_ARG_WITH([fp],
 114             AC_HELP_STRING([--with-fp],
 115                            [if using floating-point hardware @<:@default=yes@:>@]),
 116             [with_fp=$withval],
 117             [with_fp=yes])
 118 AC_SUBST(with_fp)
 119 AC_ARG_WITH([binutils],
 120             AC_HELP_STRING([--with-binutils=PATH],
 121                            [specify location of binutils (as and ld)]),
 122             [path_binutils=$withval],
 123             [path_binutils=''])
 124 AC_ARG_WITH([selinux],
 125             AC_HELP_STRING([--with-selinux],
 126                            [if building with SELinux support]),
 127             [with_selinux=$withval],
 128             [with_selinux=auto])
 129
 130 AC_ARG_WITH([headers],
 131             AC_HELP_STRING([--with-headers=PATH],
 132                            [location of system headers to use
 133                             (for example /usr/src/linux/include)
 134                             @<:@default=compiler default@:>@]),
 135             [sysheaders=$withval],
 136             [sysheaders=''])
 137 AC_SUBST(sysheaders)
 138
 139 AC_SUBST(use_default_link)
 140 AC_ARG_WITH([default-link],
 141             AC_HELP_STRING([--with-default-link],
 142                            [do not use explicit linker scripts]),
 143             [use_default_link=$withval],
 144             [use_default_link=default])
 145
 146 AC_ARG_ENABLE([sanity-checks],
 147               AC_HELP_STRING([--disable-sanity-checks],
 148                              [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
 149               [enable_sanity=$enableval],
 150               [enable_sanity=yes])
 151
 152 AC_ARG_ENABLE([shared],
 153               AC_HELP_STRING([--enable-shared],
 154                              [build shared library @<:@default=yes if GNU ld@:>@]),
 155               [shared=$enableval],
 156               [shared=yes])
 157 AC_ARG_ENABLE([profile],
 158               AC_HELP_STRING([--enable-profile],
 159                              [build profiled library @<:@default=no@:>@]),
 160               [profile=$enableval],
 161               [profile=no])
 162
 163 AC_ARG_ENABLE([hardcoded-path-in-tests],
 164               AC_HELP_STRING([--enable-hardcoded-path-in-tests],
 165                              [hardcode newly built glibc path in tests @<:@default=no@:>@]),
 166               [hardcoded_path_in_tests=$enableval],
 167               [hardcoded_path_in_tests=no])
 168 AC_SUBST(hardcoded_path_in_tests)
 169
 170 AC_ARG_ENABLE([stackguard-randomization],
 171               AC_HELP_STRING([--enable-stackguard-randomization],
 172                              [initialize __stack_chk_guard canary with a random number at program start]),
 173               [enable_stackguard_randomize=$enableval],
 174               [enable_stackguard_randomize=no])
 175 if test "$enable_stackguard_randomize" = yes; then
 176   AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
 177 fi
 178
 179 AC_ARG_ENABLE([lock-elision],
 180               AC_HELP_STRING([--enable-lock-elision[=yes/no]],
 181                              [Enable lock elision for pthread mutexes by default]),
 182               [enable_lock_elision=$enableval],
 183               [enable_lock_elision=no])
 184 AC_SUBST(enable_lock_elision)
 185 if test "$enable_lock_elision" = yes ; then
 186   AC_DEFINE(ENABLE_LOCK_ELISION)
 187 fi
 188
 189 dnl Generic infrastructure for drop-in additions to libc.
 190 AC_ARG_ENABLE([add-ons],
 191               AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
 192                              [configure and build add-ons in DIR1,DIR2,...
 193                               search for add-ons if no parameter given]),
 194                              , [enable_add_ons=yes])
 195
 196 AC_ARG_ENABLE([hidden-plt],
 197               AC_HELP_STRING([--disable-hidden-plt],
 198                              [do not hide internal function calls to avoid PLT]),
 199               [hidden=$enableval],
 200               [hidden=yes])
 201 if test "x$hidden" = xno; then
 202   AC_DEFINE(NO_HIDDEN)
 203 fi
 204
 205 AC_ARG_ENABLE([bind-now],
 206               AC_HELP_STRING([--enable-bind-now],
 207                              [disable lazy relocations in DSOs]),
 208               [bindnow=$enableval],
 209               [bindnow=no])
 210 AC_SUBST(bindnow)
 211
 212 dnl On some platforms we cannot use dynamic loading.  We must provide
 213 dnl static NSS modules.
 214 AC_ARG_ENABLE([static-nss],
 215               AC_HELP_STRING([--enable-static-nss],
 216                              [build static NSS modules @<:@default=no@:>@]),
 217               [static_nss=$enableval],
 218               [static_nss=no])
 219 dnl Enable static NSS also if we build no shared objects.
 220 if test x"$static_nss" = xyes || test x"$shared" = xno; then
 221   static_nss=yes
 222   AC_DEFINE(DO_STATIC_NSS)
 223 fi
 224
 225 AC_ARG_ENABLE([force-install],
 226               AC_HELP_STRING([--disable-force-install],
 227                              [don't force installation of files from this package, even if they are older than the installed files]),
 228               [force_install=$enableval],
 229               [force_install=yes])
 230 AC_SUBST(force_install)
 231
 232 AC_ARG_ENABLE([maintainer-mode],
 233               AC_HELP_STRING([--enable-maintainer-mode],
 234                              [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
 235               [maintainer=$enableval],
 236               [maintainer=no])
 237
 238 dnl On some platforms we allow dropping compatibility with all kernel
 239 dnl versions.
 240 AC_ARG_ENABLE([kernel],
 241               AC_HELP_STRING([--enable-kernel=VERSION],
 242                              [compile for compatibility with kernel not older than VERSION]),
 243               [minimum_kernel=$enableval],
 244               [])
 245 dnl Prevent unreasonable values.
 246 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
 247   # Better nothing than this.
 248   minimum_kernel=""
 249 else
 250   if test "$minimum_kernel" = current; then
 251     minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
 252   fi
 253 fi
 254
 255 dnl For the development we sometimes want gcc to issue even more warnings.
 256 dnl This is not the default since many of the extra warnings are not
 257 dnl appropriate.
 258 AC_ARG_ENABLE([all-warnings],
 259               AC_HELP_STRING([--enable-all-warnings],
 260                              [enable all useful warnings gcc can issue]),
 261               [all_warnings=$enableval],
 262               [])
 263 AC_SUBST(all_warnings)
 264
 265 AC_ARG_ENABLE([werror],
 266               AC_HELP_STRING([--disable-werror],
 267                              [do not build with -Werror]),
 268               [enable_werror=$enableval],
 269               [enable_werror=yes])
 270 AC_SUBST(enable_werror)
 271
 272 AC_ARG_ENABLE([multi-arch],
 273               AC_HELP_STRING([--enable-multi-arch],
 274                              [enable single DSO with optimizations for multiple architectures]),
 275               [multi_arch=$enableval],
 276               [multi_arch=default])
 277
 278 AC_ARG_ENABLE([nss-crypt],
 279               AC_HELP_STRING([--enable-nss-crypt],
 280                              [enable libcrypt to use nss]),
 281               [nss_crypt=$enableval],
 282               [nss_crypt=no])
 283 if test x$nss_crypt = xyes; then
 284   nss_includes=-I$(nss-config --includedir 2>/dev/null)
 285   if test $? -ne 0; then
 286     AC_MSG_ERROR([cannot find include directory with nss-config])
 287   fi
 288   old_CFLAGS="$CFLAGS"
 289   CFLAGS="$CFLAGS $nss_includes"
 290   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 291 #include <hasht.h>
 292 #include <nsslowhash.h>
 293 void f (void) { NSSLOW_Init (); }])],
 294              libc_cv_nss_crypt=yes,
 295              AC_MSG_ERROR([
 296 cannot find NSS headers with lowlevel hash function interfaces]))
 297   old_LIBS="$LIBS"
 298   LIBS="$LIBS -lfreebl3"
 299   AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
 300 #include <hasht.h>
 301 #include <nsslowhash.h>],
 302                                   [NSSLOW_Init();])],
 303                  libc_cv_nss_crypt=yes,
 304                  AC_MSG_ERROR([
 305 cannot link program using lowlevel NSS hash functions]))
 306   CFLAGS="$old_CFLAGS"
 307   LIBS="$old_LIBS"
 308 else
 309   libc_cv_nss_crypt=no
 310 fi
 311 AC_SUBST(libc_cv_nss_crypt)
 312
 313
 314 AC_ARG_ENABLE([obsolete-rpc],
 315               AC_HELP_STRING([--enable-obsolete-rpc],
 316                              [build and install the obsolete RPC code for link-time usage]),
 317               [link_obsolete_rpc=$enableval],
 318               [link_obsolete_rpc=no])
 319 AC_SUBST(link_obsolete_rpc)
 320
 321 if test "$link_obsolete_rpc" = yes; then
 322   AC_DEFINE(LINK_OBSOLETE_RPC)
 323 fi
 324
 325 AC_ARG_ENABLE([systemtap],
 326               [AS_HELP_STRING([--enable-systemtap],
 327                [enable systemtap static probe points @<:@default=no@:>@])],
 328               [systemtap=$enableval],
 329               [systemtap=no])
 330 if test "x$systemtap" != xno; then
 331   AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
 332   old_CFLAGS="$CFLAGS"
 333   CFLAGS="-std=gnu99 $CFLAGS"
 334   AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
 335 void foo (int i, void *p)
 336 {
 337   asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
 338        :: STAP_PROBE_ASM_OPERANDS (2, i, p));
 339 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
 340   CFLAGS="$old_CFLAGS"])
 341   if test $libc_cv_sdt = yes; then
 342     AC_DEFINE([USE_STAP_PROBE])
 343   elif test "x$systemtap" != xauto; then
 344     AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
 345   fi
 346 fi
 347
 348 AC_ARG_ENABLE([build-nscd],
 349               [AS_HELP_STRING([--disable-build-nscd],
 350                [disable building and installing the nscd daemon])],
 351               [build_nscd=$enableval],
 352               [build_nscd=default])
 353 AC_SUBST(build_nscd)
 354
 355 # Note the use of $use_nscd is near the bottom of the file.
 356 AC_ARG_ENABLE([nscd],
 357               [AS_HELP_STRING([--disable-nscd],
 358                [library functions will not contact the nscd daemon])],
 359               [use_nscd=$enableval],
 360               [use_nscd=yes])
 361
 362 AC_ARG_ENABLE([pt_chown],
 363               [AS_HELP_STRING([--enable-pt_chown],
 364                [Enable building and installing pt_chown])],
 365               [build_pt_chown=$enableval],
 366               [build_pt_chown=no])
 367 AC_SUBST(build_pt_chown)
 368 if test "$build_pt_chown" = yes; then
 369   AC_DEFINE(HAVE_PT_CHOWN)
 370 fi
 371
 372 # The abi-tags file uses a fairly simplistic model for name recognition that
 373 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu.  So we mutate a
 374 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
 375 # This doesn't get used much beyond that, so it's fairly safe.
 376 case "$host_os" in
 377 linux*)
 378   ;;
 379 gnu*)
 380   host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
 381   ;;
 382 esac
 383
 384 AC_ARG_ENABLE([mathvec],
 385               [AS_HELP_STRING([--enable-mathvec],
 386               [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
 387               [build_mathvec=$enableval],
 388               [build_mathvec=notset])
 389
 390 # We keep the original values in `$config_*' and never modify them, so we
 391 # can write them unchanged into config.make.  Everything else uses
 392 # $machine, $vendor, and $os, and changes them whenever convenient.
 393 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
 394
 395 # Don't allow vendor == "unknown"
 396 test "$config_vendor" = unknown && config_vendor=
 397 config_os="`echo $config_os | sed 's/^unknown-//'`"
 398
 399 # Some configurations imply other options.
 400 elf=yes
 401
 402 # The configure fragment of an add-on port can modify these to supplement
 403 # or override the table in the case statement below.  No fragment should
 404 # ever change the config_* variables, however.
 405 machine=$config_machine
 406 vendor=$config_vendor
 407 os=$config_os
 408 base_os=''
 409
 410 submachine=
 411 AC_ARG_WITH([cpu],
 412             AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
 413             [dnl
 414   case "$withval" in
 415   yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
 416   no) ;;
 417   *) submachine="$withval" ;;
 418   esac
 419 ])
 420
 421 # An preconfigure script can set this when it wants to disable the sanity
 422 # check below.
 423 libc_config_ok=no
 424
 425 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
 426 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
 427
 428 dnl Having this here, though empty, makes sure that if add-ons' fragments
 429 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
 430 dnl our AC_OUTPUT will actually use it.
 431 AC_CONFIG_SUBDIRS()
 432
 433 case "$enable_add_ons" in
 434 ''|no) add_ons= ;;
 435 yes|'*')
 436  add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
 437           sed 's@/[[^/]]*$@@' | sort | uniq`
 438          add_ons_automatic=yes
 439          ;;
 440 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
 441        add_ons_automatic=no ;;
 442 esac
 443
 444 configured_add_ons=
 445 add_ons_sfx=
 446 add_ons_pfx=
 447 if test x"$add_ons" != x; then
 448   for f in $add_ons; do
 449     # Some sanity checks
 450     case "$f" in
 451     crypt)
 452       AC_MSG_ERROR([
 453 *** It seems that you're using an old \`crypt' add-on.  crypt is now
 454 *** part of glibc and using the old add-on will not work with this
 455 *** release.  Start again with fresh sources and without the old
 456 *** \`crypt' add-on.])
 457     ;;
 458     localedata)
 459       AC_MSG_ERROR([
 460 *** It seems that you're using an old \`localedata' add-on.  localedata
 461 *** is now part of glibc and using the old add-on will not work with
 462 *** this release.  Start again with fresh sources and without the old
 463 *** \`localedata' add-on.])
 464     ;;
 465     esac
 466   done
 467
 468   # Now source each add-on's configure fragment.
 469   # The fragments can use $srcdir/$libc_add_on to find themselves,
 470   # and test $add_ons_automatic to see if they were explicitly requested.
 471   # A fragment can clear (or even change) $libc_add_on to affect
 472   # whether it goes into the list to be actually used in the build.
 473   use_add_ons=
 474   for libc_add_on in $add_ons; do
 475     # Test whether such a directory really exists.
 476     # It can be absolute, or relative to $srcdir, or relative to the build dir.
 477     case "$libc_add_on" in
 478     /*)
 479       libc_add_on_srcdir=$libc_add_on
 480       ;;
 481     *)
 482       test -d "$srcdir/$libc_add_on" || {
 483         if test -d "$libc_add_on"; then
 484           libc_add_on="`pwd`/$libc_add_on"
 485         else
 486           AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
 487         fi
 488       }
 489       libc_add_on_srcdir=$srcdir/$libc_add_on
 490       ;;
 491     esac
 492
 493     libc_add_on_frag=$libc_add_on_srcdir/configure
 494     libc_add_on_canonical=
 495     libc_add_on_config_subdirs=
 496     if test -r "$libc_add_on_frag"; then
 497       AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
 498       libc_add_on_canonical=unknown
 499       libc_add_on_subdirs=
 500       . "$libc_add_on_frag"
 501       test -z "$libc_add_on" || {
 502         configured_add_ons="$configured_add_ons $libc_add_on"
 503         if test "x$libc_add_on_canonical" = xunknown; then
 504           AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
 505         fi
 506         for d in $libc_add_on_subdirs; do
 507           case "$libc_add_on" in
 508           /*) subdir_srcdir="$libc_add_on" ;;
 509           *) subdir_srcdir="\$(..)$libc_add_on" ;;
 510           esac
 511           case "$d" in
 512           .)
 513             d="${libc_add_on_canonical:-$libc_add_on}"
 514             ;;
 515           /*)
 516             subdir_srcdir="$d"
 517             ;;
 518           *)
 519             subdir_srcdir="$subdir_srcdir/$d"
 520             ;;
 521           esac
 522           d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
 523           add_on_subdirs="$add_on_subdirs $d"
 524           test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
 525 $d-srcdir = $subdir_srcdir"
 526         done
 527         for d in $libc_add_on_config_subdirs; do
 528           case "$d" in
 529           /*) AC_MSG_ERROR(dnl
 530 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
 531           esac
 532           if test ! -d "$libc_add_on_srcdir/$d"; then
 533             AC_MSG_ERROR(fragment wants to configure missing directory $d)
 534           fi
 535           case "$libc_add_on" in
 536           /*) AC_MSG_ERROR(dnl
 537 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
 538           esac
 539           subdirs="$subdirs $libc_add_on/$d"
 540         done
 541       }
 542     fi
 543     if test -n "$libc_add_on"; then
 544       LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
 545       use_add_ons="$use_add_ons $libc_add_on"
 546       add_ons_pfx="$add_ons_pfx $libc_add_on/"
 547       test -z "$libc_add_on_canonical" ||
 548       add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
 549     fi
 550   done
 551   # Use echo to strip excess whitespace.
 552   add_ons="`echo $use_add_ons`"
 553 fi
 554 AC_SUBST(add_ons)
 555 AC_SUBST(add_on_subdirs)
 556
 557
 558 ###
 559 ### I put this here to prevent those annoying emails from people who cannot
 560 ### read and try to compile glibc on unsupported platforms.  --drepper
 561 ###
 562 ### By using the undocumented --enable-hacker-mode option for configure
 563 ### one can skip this test to make the configuration not fail for unsupported
 564 ### platforms.
 565 ###
 566 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
 567   case "$machine-$host_os" in
 568   *-linux* | *-gnu*)
 569     ;;
 570   *)
 571     echo "*** The GNU C library is currently not available for this platform."
 572     echo "*** So far nobody cared to port it and if there is no volunteer it"
 573     echo "*** might never happen.  So, if you have interest to see glibc on"
 574     echo "*** this platform visit"
 575     echo "***   http://www.gnu.org/software/libc/porting.html"
 576     echo "*** and join the group of porters"
 577     exit 1
 578     ;;
 579   esac
 580 fi
 581
 582 # Set base_machine if not set by a preconfigure fragment.
 583 test -n "$base_machine" || base_machine=$machine
 584 AC_SUBST(base_machine)
 585
 586 # For the multi-arch option we need support in the assembler & linker.
 587 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
 588                libc_cv_ld_gnu_indirect_function, [dnl
 589 cat > conftest.S <<EOF
 590 .type foo,%gnu_indirect_function
 591 foo:
 592 .globl _start
 593 _start:
 594 .globl __start
 595 __start:
 596 .data
 597 #ifdef _LP64
 598 .quad foo
 599 #else
 600 .long foo
 601 #endif
 602 EOF
 603 libc_cv_ld_gnu_indirect_function=no
 604 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
 605             -nostartfiles -nostdlib \
 606             -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
 607   # Do a link to see if the backend supports IFUNC relocs.
 608   $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
 609   LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
 610     libc_cv_ld_gnu_indirect_function=yes
 611   }
 612 fi
 613 rm -f conftest*])
 614
 615 AC_MSG_CHECKING(whether .text pseudo-op must be used)
 616 AC_CACHE_VAL(libc_cv_dot_text, [dnl
 617 cat > conftest.s <<EOF
 618 .text
 619 EOF
 620 libc_cv_dot_text=
 621 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
 622   libc_cv_dot_text=.text
 623 fi
 624 rm -f conftest*])
 625 if test -z "$libc_cv_dot_text"; then
 626   AC_MSG_RESULT(no)
 627 else
 628   AC_MSG_RESULT(yes)
 629 fi
 630
 631 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
 632   if test x"$multi_arch" = xyes; then
 633     AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
 634   else
 635     multi_arch=no
 636   fi
 637 fi
 638 multi_arch_d=
 639 if test x"$multi_arch" != xno; then
 640   multi_arch_d=/multiarch
 641 fi
 642
 643 # Compute the list of sysdep directories for this configuration.
 644 # This can take a while to compute.
 645 sysdep_dir=$srcdir/sysdeps
 646 AC_MSG_CHECKING(sysdep dirs)
 647 dnl We need to use [ and ] for other purposes for a while now.
 648 changequote(,)dnl
 649 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
 650 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
 651
 652 test "x$base_os" != x || case "$os" in
 653 gnu*)
 654   base_os=mach/hurd ;;
 655 linux*)
 656   base_os=unix/sysv ;;
 657 esac
 658
 659 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
 660 tail=$os
 661 ostry=$os
 662 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
 663   ostry="$ostry /$o"
 664   tail=$o
 665 done
 666 o=`echo $tail | sed 's/[0-9]*$//'`
 667 if test $o != $tail; then
 668   ostry="$ostry /$o"
 669 fi
 670 # For linux-gnu, try linux-gnu, then linux.
 671 o=`echo $tail | sed 's/-.*$//'`
 672 if test $o != $tail; then
 673   ostry="$ostry /$o"
 674 fi
 675
 676 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
 677 base=
 678 tail=$base_os
 679 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
 680   set $b
 681   base="$base /$1"
 682   tail="$2"
 683 done
 684
 685 # For sparc/sparc32, try sparc/sparc32 and then sparc.
 686 mach=
 687 tail=$machine${submachine:+/$submachine}
 688 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
 689   set $m
 690   # Prepend the machine's FPU directory unless --without-fp.
 691   if test "$with_fp" = yes; then
 692     maybe_fpu=/fpu
 693   else
 694     maybe_fpu=/nofpu
 695   fi
 696   # For each machine term, try it with and then without /multiarch.
 697   for try_fpu in $maybe_fpu ''; do
 698     for try_multi in $multi_arch_d ''; do
 699       mach="$mach /$1$try_fpu$try_multi"
 700     done
 701   done
 702   tail="$2"
 703 done
 704
 705 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
 706 changequote([,])dnl
 707
 708 # Find what sysdep directories exist.
 709 sysnames_add_ons=
 710 sysnames=
 711 for b in $base ''; do
 712   for m0 in $mach ''; do
 713     for v in /$vendor ''; do
 714       test "$v" = / && continue
 715       for o in /$ostry ''; do
 716         test "$o" = / && continue
 717         for m in $mach ''; do
 718           for d in $add_ons_pfx ''; do
 719             for a in $add_ons_sfx ''; do
 720               try_suffix="$m0$b$v$o$m"
 721               if test -n "$try_suffix"; then
 722                 try_srcdir="${srcdir}/"
 723                 case "$d" in
 724                 /*) try_srcdir= ;;
 725                 esac
 726                 try="${d}sysdeps$try_suffix$a"
 727                 test -n "$enable_debug_configure" &&
 728                 echo "$0 [DEBUG]: try $try" >&2
 729                 if test -d "$try_srcdir$try"; then
 730                   sysnames="$sysnames $try"
 731                   { test -n "$o" || test -n "$b"; } && os_used=t
 732                   { test -n "$m" || test -n "$m0"; } && machine_used=t
 733                   case x${m0:-$m} in
 734                   x*/$submachine) submachine_used=t ;;
 735                   esac
 736                   if test -n "$d"; then
 737                     case "$sysnames_add_ons" in
 738                     *" $d "*) ;;
 739                     *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 740                     esac
 741                   fi
 742                 fi
 743               fi
 744             done
 745           done
 746         done
 747       done
 748     done
 749   done
 750 done
 751
 752 # If the assembler supports gnu_indirect_function symbol type and the
 753 # architecture supports multi-arch, we enable multi-arch by default.
 754 case $sysnames_add_ons$sysnames in
 755 *"$multi_arch_d"*)
 756   ;;
 757 *)
 758   test x"$multi_arch" = xdefault && multi_arch=no
 759   ;;
 760 esac
 761 if test x"$multi_arch" != xno; then
 762   AC_DEFINE(USE_MULTIARCH)
 763 fi
 764 AC_SUBST(multi_arch)
 765
 766 if test -z "$os_used" && test "$os" != none; then
 767   AC_MSG_ERROR(Operating system $os is not supported.)
 768 fi
 769 if test -z "$machine_used" && test "$machine" != none; then
 770   AC_MSG_ERROR(The $machine is not supported.)
 771 fi
 772 if test -z "$submachine_used" && test -n "$submachine"; then
 773   AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
 774 fi
 775 AC_SUBST(submachine)
 776
 777 # We have now validated the configuration.
 778
 779 # Expand the list of system names into a full list of directories
 780 # from each element's parent name and Implies file (if present).
 781 set $sysnames
 782 names=
 783 while test $# -gt 0; do
 784   name=$1
 785   shift
 786
 787   case " $names " in *" $name "*)
 788     # Already in the list.
 789     continue
 790   esac
 791
 792   # Report each name as we discover it, so there is no long pause in output.
 793   echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
 794
 795   name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
 796
 797   case $name in
 798     /*) xsrcdir= ;;
 799     *)  xsrcdir=$srcdir/ ;;
 800   esac
 801   test -n "$enable_debug_configure" &&
 802   echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
 803
 804   for implies_file in Implies Implies-before Implies-after; do
 805     implies_type=`echo $implies_file | sed s/-/_/`
 806     eval ${implies_type}=
 807     if test -f $xsrcdir$name/$implies_file; then
 808       # Collect more names from the `Implies' file (removing comments).
 809       implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
 810       for x in $implied_candidate; do
 811         found=no
 812         if test -d $xsrcdir$name_base/$x; then
 813           eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
 814           found=yes
 815         fi
 816         for d in $add_ons_pfx ''; do
 817           try="${d}sysdeps/$x"
 818           case $d in
 819            /*) try_srcdir= ;;
 820            *) try_srcdir=$srcdir/ ;;
 821           esac
 822           test -n "$enable_debug_configure" &&
 823            echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
 824           if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
 825           then
 826             eval "${implies_type}=\"\$${implies_type} \$try\""
 827             found=yes
 828             case "$sysnames_add_ons" in
 829             *" $d "*) ;;
 830             *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
 831             esac
 832           fi
 833         done
 834         if test $found = no; then
 835           AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
 836         fi
 837       done
 838     fi
 839   done
 840
 841   # Add NAME to the list of names.
 842   names="$names $name"
 843
 844   # Find the parent of NAME, using the empty string if it has none.
 845 changequote(,)dnl
 846   parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
 847 changequote([,])dnl
 848
 849   test -n "$enable_debug_configure" &&
 850     echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
 851 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
 852
 853   # Add the names implied by NAME, and NAME's parent (if it has one), to
 854   # the list of names to be processed (the argument list).  We prepend the
 855   # implied names to the list and append the parent.  We want implied
 856   # directories to come before further directories inferred from the
 857   # configuration components; this ensures that for sysv4, unix/common
 858   # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
 859   # after sysv4).
 860   sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
 861   test -n "$sysnames" && set $sysnames
 862 done
 863
 864 # Add the default directories.
 865 default_sysnames="sysdeps/generic"
 866 sysnames="$names $default_sysnames"
 867 AC_SUBST(sysnames)
 868 # The other names were emitted during the scan.
 869 AC_MSG_RESULT($default_sysnames)
 870
 871 # Collect the list of add-ons that supply partial sysdeps trees.
 872 sysdeps_add_ons=
 873 for add_on in $add_ons; do
 874   case "$add_on" in
 875   /*) xsrcdir= ;;
 876   *) xsrcdir="$srcdir/" ;;
 877   esac
 878
 879   test -d "$xsrcdir$add_on/sysdeps" || {
 880     case "$configured_add_ons " in
 881     *" $add_on "*) ;;
 882     *|'')
 883       AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
 884       ;;
 885     esac
 886     continue
 887   }
 888
 889   sysdeps_add_ons="$sysdeps_add_ons $add_on"
 890   case "$sysnames_add_ons" in
 891   *" $add_on/ "*) ;;
 892   *|'')
 893     AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
 894     continue ;;
 895   esac
 896
 897   found=no
 898   for d in $sysnames; do
 899     case "$d" in
 900     $add_on/sysdeps/*) ;;
 901     *) continue ;;
 902     esac
 903     (cd "$xsrcdir$d" && for f in *[[!~]]; do
 904        case "$f" in
 905        sys|bits)
 906          for ff in $f/*.h; do
 907            test -d "$ff" || { test -e "$ff" && exit 88; }
 908          done
 909          ;;
 910        *)
 911          test -d "$f" || { test -e "$f" && exit 88; }
 912          ;;
 913        esac
 914      done)
 915     if test $? -eq 88; then
 916       found=yes
 917       break
 918     fi
 919   done
 920   if test $found = no; then
 921     AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
 922   fi
 923 done
 924 AC_SUBST(sysdeps_add_ons)
 925
 926
 927 ### Locate tools.
 928
 929 AC_PROG_INSTALL
 930 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
 931   # The makefiles need to use a different form to find it in $srcdir.
 932   INSTALL='\$(..)./scripts/install-sh -c'
 933 fi
 934 AC_PROG_LN_S
 935
 936 LIBC_PROG_BINUTILS
 937
 938 # Accept binutils 2.22 or newer.
 939 AC_CHECK_PROG_VER(AS, $AS, --version,
 940                   [GNU assembler.* \([0-9]*\.[0-9.]*\)],
 941                   [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 942                   AS=: critic_missing="$critic_missing as")
 943 AC_CHECK_PROG_VER(LD, $LD, --version,
 944                   [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
 945                   [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
 946                   LD=: critic_missing="$critic_missing ld")
 947
 948 # These programs are version sensitive.
 949 AC_CHECK_TOOL_PREFIX
 950 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
 951   [GNU Make[^0-9]*\([0-9][0-9.]*\)],
 952   [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
 953
 954 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
 955   [GNU gettext.* \([0-9]*\.[0-9.]*\)],
 956   [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
 957   MSGFMT=: aux_missing="$aux_missing msgfmt")
 958 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
 959   [GNU texinfo.* \([0-9][0-9.]*\)],
 960   [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
 961   MAKEINFO=: aux_missing="$aux_missing makeinfo")
 962 AC_CHECK_PROG_VER(SED, sed, --version,
 963   [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
 964   [3.0[2-9]*|3.[1-9]*|[4-9]*],
 965   SED=: aux_missing="$aux_missing sed")
 966 AC_CHECK_PROG_VER(AWK, gawk, --version,
 967   [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
 968   [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
 969
 970 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
 971 AC_TRY_COMPILE([], [
 972 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
 973 #error insufficient compiler
 974 #endif],
 975                [libc_cv_compiler_ok=yes],
 976                [libc_cv_compiler_ok=no])])
 977 AS_IF([test $libc_cv_compiler_ok != yes],
 978       [critic_missing="$critic_missing compiler"])
 979
 980 AC_CHECK_TOOL(NM, nm, false)
 981
 982 if test "x$maintainer" = "xyes"; then
 983   AC_CHECK_PROGS(AUTOCONF, autoconf, no)
 984   case "x$AUTOCONF" in
 985   xno|x|x:) AUTOCONF=no ;;
 986   *)
 987     AC_CACHE_CHECK(dnl
 988   whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
 989     if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
 990       libc_cv_autoconf_works=yes
 991     else
 992       libc_cv_autoconf_works=no
 993     fi])
 994     test $libc_cv_autoconf_works = yes || AUTOCONF=no
 995     ;;
 996   esac
 997   if test "x$AUTOCONF" = xno; then
 998     aux_missing="$aux_missing autoconf"
 999   fi
1000 else
1001   AUTOCONF=no
1002 fi
1003
1004 test -n "$critic_missing" && AC_MSG_ERROR([
1005 *** These critical programs are missing or too old:$critic_missing
1006 *** Check the INSTALL file for required versions.])
1007
1008 test -n "$aux_missing" && AC_MSG_WARN([
1009 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1010 *** some features will be disabled.
1011 *** Check the INSTALL file for required versions.])
1012
1013 # if using special system headers, find out the compiler's sekrit
1014 # header directory and add that to the list.  NOTE: Only does the right
1015 # thing on a system that doesn't need fixincludes.  (Not presently a problem.)
1016 if test -n "$sysheaders"; then
1017   SYSINCLUDES=-nostdinc
1018   for d in include include-fixed; do
1019     i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1020     SYSINCLUDES="$SYSINCLUDES -isystem $i"
1021   done
1022   SYSINCLUDES="$SYSINCLUDES \
1023 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1024   if test -n "$CXX"; then
1025     CXX_SYSINCLUDES=
1026     for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1027     | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1028       test "x$cxxheaders" != x &&
1029       CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1030     done
1031   fi
1032 fi
1033 AC_SUBST(SYSINCLUDES)
1034 AC_SUBST(CXX_SYSINCLUDES)
1035
1036 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1037 # since this would lead to problems installing/building glibc.
1038 # LD_LIBRARY_PATH contains the current directory if one of the following
1039 # is true:
1040 # - one of the terminals (":" and ";") is the first or last sign
1041 # - two terminals occur directly after each other
1042 # - the path contains an element with a dot in it
1043 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1044 changequote(,)dnl
1045 case ${LD_LIBRARY_PATH} in
1046   [:\;]* | *[:\;] | *[:\;][:\;]* |  *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1047     ld_library_path_setting="contains current directory"
1048     ;;
1049   *)
1050     ld_library_path_setting="ok"
1051     ;;
1052 esac
1053 changequote([,])dnl
1054 AC_MSG_RESULT($ld_library_path_setting)
1055 if test "$ld_library_path_setting" != "ok"; then
1056 AC_MSG_ERROR([
1057 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1058 *** building glibc. Please change the environment variable
1059 *** and run configure again.])
1060 fi
1061
1062 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1063 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1064   libc_cv_gcc_static_libgcc=
1065 else
1066   libc_cv_gcc_static_libgcc=-static-libgcc
1067 fi])
1068 AC_SUBST(libc_cv_gcc_static_libgcc)
1069
1070 AC_PATH_PROG(BASH_SHELL, bash, no)
1071
1072 AC_PATH_PROG(PERL, perl, no)
1073 if test "$PERL" != no &&
1074    (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1075   PERL=no
1076 fi
1077 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1078              $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1079 AC_CHECK_PROG_VER(BISON, bison, --version,
1080                   [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1081                   [2.7*|[3-9].*|[1-9][0-9]*],
1082                   BISON=no)
1083
1084 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1085 AC_TRY_COMPILE(dnl
1086 [#define __need_size_t
1087 #define __need_wchar_t
1088 #include <stddef.h>
1089 #define __need_NULL
1090 #include <stddef.h>], [size_t size; wchar_t wchar;
1091 #ifdef offsetof
1092 #error stddef.h ignored __need_*
1093 #endif
1094 if (&size == NULL || &wchar == NULL) abort ();],
1095                libc_cv_friendly_stddef=yes,
1096                libc_cv_friendly_stddef=no)])
1097 if test $libc_cv_friendly_stddef = yes; then
1098   config_vars="$config_vars
1099 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1100 fi
1101
1102 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1103                libc_cv_need_minus_P, [dnl
1104 cat > conftest.S <<EOF
1105 #include "confdefs.h"
1106 /* Nothing whatsoever.  */
1107 EOF
1108 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1109   libc_cv_need_minus_P=no
1110 else
1111   libc_cv_need_minus_P=yes
1112 fi
1113 rm -f conftest*])
1114 if test $libc_cv_need_minus_P = yes; then
1115   config_vars="$config_vars
1116 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1117 fi
1118
1119 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1120 cat > conftest.s <<EOF
1121 ${libc_cv_dot_text}
1122 foo:
1123 .set glibc_conftest_frobozz,foo
1124 .globl glibc_conftest_frobozz
1125 EOF
1126 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1127 # (but it doesn't work), so we must do a linking check to be sure.
1128 cat > conftest1.c <<\EOF
1129 extern int glibc_conftest_frobozz;
1130 void _start() { glibc_conftest_frobozz = 1; }
1131 EOF
1132 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1133             -nostartfiles -nostdlib \
1134             -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1135   libc_cv_asm_set_directive=yes
1136 else
1137   libc_cv_asm_set_directive=no
1138 fi
1139 rm -f conftest*])
1140 if test $libc_cv_asm_set_directive = yes; then
1141   AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1142 fi
1143
1144 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1145                libc_cv_asm_unique_object, [dnl
1146 cat > conftest.s <<EOF
1147 ${libc_cv_dot_text}
1148 _sym:
1149 .type _sym, %gnu_unique_object
1150 EOF
1151 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1152   libc_cv_asm_unique_object=yes
1153 else
1154   libc_cv_asm_unique_object=no
1155 fi
1156 rm -f conftest*])
1157 if test $libc_cv_asm_unique_object = yes; then
1158   AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1159 fi
1160
1161 AC_CACHE_CHECK(for .previous assembler directive,
1162                libc_cv_asm_previous_directive, [dnl
1163 cat > conftest.s <<EOF
1164 .section foo_section
1165 .previous
1166 EOF
1167 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1168   libc_cv_asm_previous_directive=yes
1169 else
1170   libc_cv_asm_previous_directive=no
1171 fi
1172 rm -f conftest*])
1173 if test $libc_cv_asm_previous_directive = yes; then
1174   AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1175 else
1176   AC_CACHE_CHECK(for .popsection assembler directive,
1177                  libc_cv_asm_popsection_directive, [dnl
1178   cat > conftest.s <<EOF
1179 .pushsection foo_section
1180 .popsection
1181 EOF
1182   if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1183     libc_cv_asm_popsection_directive=yes
1184   else
1185     libc_cv_asm_popsection_directive=no
1186   fi
1187   rm -f conftest*])
1188   if test $libc_cv_asm_popsection_directive = yes; then
1189     AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1190   fi
1191 fi
1192 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1193                libc_cv_asm_protected_directive, [dnl
1194 cat > conftest.s <<EOF
1195 .protected foo
1196 foo:
1197 .hidden bar
1198 bar:
1199 EOF
1200 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1201   libc_cv_asm_protected_directive=yes
1202 else
1203   AC_MSG_ERROR(assembler support for symbol visibility is required)
1204 fi
1205 rm -f conftest*])
1206
1207 if test $libc_cv_asm_protected_directive = yes; then
1208   AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1209                  libc_cv_visibility_attribute,
1210                  [cat > conftest.c <<EOF
1211                   int foo __attribute__ ((visibility ("hidden"))) = 1;
1212                   int bar __attribute__ ((visibility ("protected"))) = 1;
1213 EOF
1214                   libc_cv_visibility_attribute=no
1215                   if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1216                     if grep '\.hidden.*foo' conftest.s >/dev/null; then
1217                       if grep '\.protected.*bar' conftest.s >/dev/null; then
1218                         libc_cv_visibility_attribute=yes
1219                       fi
1220                     fi
1221                   fi
1222                   rm -f conftest.{c,s}
1223                  ])
1224   if test $libc_cv_visibility_attribute != yes; then
1225     AC_MSG_ERROR(compiler support for visibility attribute is required)
1226   fi
1227 fi
1228
1229 if test $libc_cv_visibility_attribute = yes; then
1230   AC_CACHE_CHECK(linker support for protected data symbol,
1231                  libc_cv_protected_data,
1232                  [cat > conftest.c <<EOF
1233                   int bar __attribute__ ((visibility ("protected"))) = 1;
1234 EOF
1235                   libc_cv_protected_data=no
1236                   if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
1237                     cat > conftest.c <<EOF
1238                     extern int bar;
1239                     int main (void) { return bar; }
1240 EOF
1241                     if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
1242                       libc_cv_protected_data=yes
1243                     fi
1244                   fi
1245                   rm -f conftest.*
1246                  ])
1247 else
1248   libc_cv_protected_data=no
1249 fi
1250 AC_SUBST(libc_cv_protected_data)
1251
1252 if test $libc_cv_visibility_attribute = yes; then
1253   AC_CACHE_CHECK(for broken __attribute__((visibility())),
1254                  libc_cv_broken_visibility_attribute,
1255                  [cat > conftest.c <<EOF
1256                   int foo (int x);
1257                   int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1258                   int bar (int x) { return x; }
1259 EOF
1260                   libc_cv_broken_visibility_attribute=yes
1261                   if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1262 changequote(,)dnl
1263                     if grep '\.hidden[  _]foo' conftest.s >/dev/null; then
1264 changequote([,])dnl
1265                       libc_cv_broken_visibility_attribute=no
1266                     fi
1267                   fi
1268                   rm -f conftest.c conftest.s
1269                  ])
1270   if test $libc_cv_broken_visibility_attribute = yes; then
1271     AC_MSG_ERROR(working compiler support for visibility attribute is required)
1272   fi
1273 fi
1274
1275 AC_CACHE_CHECK(for broken __attribute__((alias())),
1276                libc_cv_broken_alias_attribute,
1277                [cat > conftest.c <<EOF
1278                extern int foo (int x) __asm ("xyzzy");
1279                int bar (int x) { return x; }
1280                extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1281                extern int dfoo;
1282                extern __typeof (dfoo) dfoo __asm ("abccb");
1283                int dfoo = 1;
1284 EOF
1285                libc_cv_broken_alias_attribute=yes
1286                if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1287                  if grep 'xyzzy' conftest.s >/dev/null &&
1288                     grep 'abccb' conftest.s >/dev/null; then
1289                    libc_cv_broken_alias_attribute=no
1290                  fi
1291                fi
1292                rm -f conftest.c conftest.s
1293                ])
1294 if test $libc_cv_broken_alias_attribute = yes; then
1295   AC_MSG_ERROR(working alias attribute support required)
1296 fi
1297
1298 if test $libc_cv_visibility_attribute = yes; then
1299   AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1300                  libc_cv_have_sdata_section,
1301                  [echo "int i;" > conftest.c
1302                   libc_cv_have_sdata_section=no
1303                   if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1304                      | grep '\.sdata' >/dev/null; then
1305                     libc_cv_have_sdata_section=yes
1306                   fi
1307                   rm -f conftest.c conftest.so
1308                  ])
1309   if test $libc_cv_have_sdata_section = yes; then
1310     AC_DEFINE(HAVE_SDATA_SECTION)
1311   fi
1312 fi
1313
1314 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1315                libc_cv_initfini_array, [dnl
1316 LIBC_TRY_LINK_STATIC([
1317 int foo (void) { return 1; }
1318 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1319 ],
1320   [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1321     libc_cv_initfini_array=yes
1322   else
1323     libc_cv_initfini_array=no
1324   fi],
1325   [libc_cv_initfini_array=no])
1326 ])
1327 if test $libc_cv_initfini_array != yes; then
1328   AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1329 fi
1330
1331 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1332                libc_cv_ctors_header, [dnl
1333   libc_cv_ctors_header=yes
1334   LIBC_TRY_LINK_STATIC([
1335 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1336 __attribute__ ((destructor))  void dtor (void) { asm (""); }
1337 ],
1338               [dnl
1339       AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1340         { gsub(/\@<:@ */, "@<:@") }
1341         $2 == ".ctors" || $2 == ".dtors" {
1342           size = strtonum("0x" $6)
1343           align = strtonum("0x" $NF)
1344           seen@<:@$2@:>@ = 1
1345           stub@<:@$2@:>@ = size == align * 2
1346         }
1347         END {
1348           ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1349           dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1350           exit ((ctors_ok && dtors_ok) ? 0 : 1)
1351         }
1352       '], [libc_cv_ctors_header=no])
1353     ], [dnl
1354       AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1355     ])
1356 ])
1357 if test $libc_cv_ctors_header = no; then
1358   AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1359 fi
1360
1361 AC_CACHE_CHECK(for libunwind-support in compiler,
1362                libc_cv_cc_with_libunwind, [
1363   cat > conftest.c <<EOF
1364 int main (void) { return 0; }
1365 EOF
1366   if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1367      conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1368     libc_cv_cc_with_libunwind=yes
1369   else
1370     libc_cv_cc_with_libunwind=no
1371   fi
1372   rm -f conftest*])
1373 AC_SUBST(libc_cv_cc_with_libunwind)
1374 if test $libc_cv_cc_with_libunwind = yes; then
1375   AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1376 fi
1377
1378 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1379                     [libc_cv_z_nodelete=yes],
1380                     [AC_MSG_ERROR(linker with -z nodelete support required)])
1381
1382 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1383                     [libc_cv_z_nodlopen=yes],
1384                     [AC_MSG_ERROR(linker with -z nodlopen support required)])
1385
1386 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1387                     [libc_cv_z_initfirst=yes],
1388                     [AC_MSG_ERROR(linker with -z initfirst support required)])
1389
1390 AC_CACHE_CHECK(for -Bgroup option,
1391                libc_cv_Bgroup, [dnl
1392 cat > conftest.c <<EOF
1393 int _start (void) { return 42; }
1394 EOF
1395 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1396                             -fPIC -shared -o conftest.so conftest.c
1397                             -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1398 then
1399   libc_cv_Bgroup=yes
1400 else
1401   libc_cv_Bgroup=no
1402 fi
1403 rm -f conftest*])
1404 AC_SUBST(libc_cv_Bgroup)
1405
1406 ASFLAGS_config=
1407 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1408                libc_cv_as_noexecstack, [dnl
1409 cat > conftest.c <<EOF
1410 void foo (void) { }
1411 EOF
1412 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1413                    -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1414    && grep .note.GNU-stack conftest.s >/dev/null \
1415    && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1416                       -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1417 then
1418   libc_cv_as_noexecstack=yes
1419 else
1420   libc_cv_as_noexecstack=no
1421 fi
1422 rm -f conftest*])
1423 if test $libc_cv_as_noexecstack = yes; then
1424   ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1425 fi
1426 AC_SUBST(ASFLAGS_config)
1427
1428 AC_CACHE_CHECK(for -z combreloc,
1429                libc_cv_z_combreloc, [dnl
1430 cat > conftest.c <<EOF
1431 extern int bar (int);
1432 extern int mumble;
1433 int foo (void) { return bar (mumble); }
1434 EOF
1435 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1436                         -fPIC -shared -o conftest.so conftest.c
1437                         -nostdlib -nostartfiles
1438                         -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1439 then
1440 dnl The following test is a bit weak.  We must use a tool which can test
1441 dnl cross-platform since the gcc used can be a cross compiler.  Without
1442 dnl introducing new options this is not easily doable.  Instead use a tool
1443 dnl which always is cross-platform: readelf.  To detect whether -z combreloc
1444 dnl look for a section named .rel.dyn.
1445   if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1446     libc_cv_z_combreloc=yes
1447   else
1448     libc_cv_z_combreloc=no
1449   fi
1450 else
1451   libc_cv_z_combreloc=no
1452 fi
1453 rm -f conftest*])
1454 if test "$libc_cv_z_combreloc" = yes; then
1455   AC_DEFINE(HAVE_Z_COMBRELOC)
1456 fi
1457 AC_SUBST(libc_cv_z_combreloc)
1458
1459 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1460                     [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1461 AC_SUBST(libc_cv_z_execstack)
1462
1463 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1464 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1465 ])
1466
1467 AC_SUBST(libc_cv_fpie)
1468
1469 AC_CACHE_CHECK(for --hash-style option,
1470                libc_cv_hashstyle, [dnl
1471 cat > conftest.c <<EOF
1472 int _start (void) { return 42; }
1473 EOF
1474 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1475                             -fPIC -shared -o conftest.so conftest.c
1476                             -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1477 then
1478   libc_cv_hashstyle=yes
1479 else
1480   libc_cv_hashstyle=no
1481 fi
1482 rm -f conftest*])
1483 AC_SUBST(libc_cv_hashstyle)
1484
1485 # The linker's default -shared behavior is good enough if it
1486 # does these things that our custom linker scripts ensure that
1487 # all allocated NOTE sections come first.
1488 if test "$use_default_link" = default; then
1489   AC_CACHE_CHECK([for sufficient default -shared layout],
1490                   libc_cv_use_default_link, [dnl
1491   libc_cv_use_default_link=no
1492   cat > conftest.s <<\EOF
1493           .section .note.a,"a",%note
1494           .balign 4
1495           .long 4,4,9
1496           .string "GNU"
1497           .string "foo"
1498           .section .note.b,"a",%note
1499           .balign 4
1500           .long 4,4,9
1501           .string "GNU"
1502           .string "bar"
1503 EOF
1504   if AC_TRY_COMMAND([dnl
1505   ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1506        ac_try=`$READELF -S conftest.so | sed -n \
1507          ['${x;p;}
1508           s/^ *\[ *[1-9][0-9]*\]  *\([^ ][^ ]*\)  *\([^ ][^ ]*\) .*$/\2 \1/
1509           t a
1510           b
1511           : a
1512           H']`
1513   then
1514     libc_seen_a=no libc_seen_b=no
1515     set -- $ac_try
1516     while test $# -ge 2 -a "$1" = NOTE; do
1517       case "$2" in
1518       .note.a) libc_seen_a=yes ;;
1519       .note.b) libc_seen_b=yes ;;
1520       esac
1521       shift 2
1522     done
1523     case "$libc_seen_a$libc_seen_b" in
1524     yesyes)
1525       libc_cv_use_default_link=yes
1526       ;;
1527     *)
1528       echo >&AS_MESSAGE_LOG_FD "\
1529 $libc_seen_a$libc_seen_b from:
1530 $ac_try"
1531       ;;
1532     esac
1533   fi
1534   rm -f conftest*])
1535   use_default_link=$libc_cv_use_default_link
1536 fi
1537
1538 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1539 if libc_cv_output_format=`
1540 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1541 then
1542   :
1543 else
1544   libc_cv_output_format=
1545 fi
1546 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1547 AC_SUBST(libc_cv_output_format)
1548
1549 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1550 cat > conftest.c <<EOF
1551 int foo;
1552 EOF
1553 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1554                             conftest.c 1>&AS_MESSAGE_LOG_FD])
1555 then
1556   libc_cv_fno_toplevel_reorder=yes
1557 else
1558   libc_cv_fno_toplevel_reorder=no
1559 fi
1560 rm -f conftest*])
1561 if test $libc_cv_fno_toplevel_reorder = yes; then
1562   fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1563 else
1564   fno_unit_at_a_time=-fno-unit-at-a-time
1565 fi
1566 AC_SUBST(fno_unit_at_a_time)
1567
1568 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1569 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1570                    [libc_cv_ssp=yes],
1571                    [libc_cv_ssp=no])
1572 ])
1573 AC_SUBST(libc_cv_ssp)
1574
1575 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1576 cat > conftest.c <<EOF
1577 int foo;
1578 #ifdef __GNUC_GNU_INLINE__
1579 main () { return 0;}
1580 #else
1581 #error
1582 #endif
1583 EOF
1584 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1585                             -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1586 then
1587   libc_cv_gnu89_inline=yes
1588 else
1589   libc_cv_gnu89_inline=no
1590 fi
1591 rm -f conftest*])
1592 if test $libc_cv_gnu89_inline = yes; then
1593   gnu89_inline=-fgnu89-inline
1594 else
1595   gnu89_inline=
1596 fi
1597 AC_SUBST(gnu89_inline)
1598
1599 AC_CACHE_CHECK(whether cc puts quotes around section names,
1600                libc_cv_have_section_quotes,
1601                [cat > conftest.c <<EOF
1602                 static const int foo
1603                 __attribute__ ((section ("bar"))) = 1;
1604 EOF
1605                 if ${CC-cc} -S conftest.c -o conftest.s; then
1606                   if grep '\.section.*"bar"' conftest.s >/dev/null; then
1607                     libc_cv_have_section_quotes=yes
1608                   else
1609                     libc_cv_have_section_quotes=no
1610                   fi
1611                 else
1612                   libc_cv_have_section_quotes=unknown
1613                 fi
1614                 rm -f conftest.{c,s}
1615                 ])
1616 if test $libc_cv_have_section_quotes = yes; then
1617   AC_DEFINE(HAVE_SECTION_QUOTES)
1618 fi
1619
1620 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1621                [dnl
1622 cat > conftest.s <<EOF
1623 ${libc_cv_dot_text}
1624 .globl foo
1625 foo:
1626 .weak foo
1627 .weak bar; bar = foo
1628 EOF
1629 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1630   libc_cv_asm_weak_directive=yes
1631 else
1632   libc_cv_asm_weak_directive=no
1633 fi
1634 rm -f conftest*])
1635
1636 if test $libc_cv_asm_weak_directive = no; then
1637   AC_CACHE_CHECK(for assembler .weakext directive,
1638                  libc_cv_asm_weakext_directive,
1639                  [dnl
1640 cat > conftest.s <<EOF
1641 ${libc_cv_dot_text}
1642 .globl foo
1643 foo:
1644 .weakext bar foo
1645 .weakext baz
1646 .globl baz
1647 baz:
1648 EOF
1649   if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1650     libc_cv_asm_weakext_directive=yes
1651   else
1652     libc_cv_asm_weakext_directive=no
1653   fi
1654   rm -f conftest*])
1655
1656 fi # no .weak
1657
1658 if test $libc_cv_asm_weak_directive = yes; then
1659   AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1660 elif test $libc_cv_asm_weakext_directive = yes; then
1661   AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1662 fi
1663
1664 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1665 cat > conftest.c <<\EOF
1666 _start () {}
1667 int __eh_pc;
1668 __throw () {}
1669 EOF
1670 dnl No \ in command here because it ends up inside ''.
1671 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1672                             -nostdlib -nostartfiles -Wl,--no-whole-archive
1673                             -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1674   libc_cv_ld_no_whole_archive=yes
1675 else
1676   libc_cv_ld_no_whole_archive=no
1677 fi
1678 rm -f conftest*])
1679 if test $libc_cv_ld_no_whole_archive = no; then
1680   AC_MSG_ERROR([support for --no-whole-archive is needed])
1681 fi
1682
1683 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1684 cat > conftest.c <<\EOF
1685 _start () {}
1686 int __eh_pc;
1687 __throw () {}
1688 EOF
1689 dnl No \ in command here because it ends up inside ''.
1690 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1691                             -nostdlib -nostartfiles -fexceptions
1692                             -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1693   libc_cv_gcc_exceptions=yes
1694 else
1695   libc_cv_gcc_exceptions=no
1696 fi
1697 rm -f conftest*])
1698 if test $libc_cv_gcc_exceptions = yes; then
1699   exceptions=-fexceptions
1700 fi
1701 AC_SUBST(exceptions)dnl
1702
1703 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1704 cat > conftest.c <<\EOF
1705 void zero (void *x)
1706 {
1707   __builtin_memset (x, 0, 1000);
1708 }
1709 EOF
1710 dnl
1711 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1712 then
1713   libc_cv_gcc_builtin_memset=no
1714 else
1715   libc_cv_gcc_builtin_memset=yes
1716 fi
1717 rm -f conftest* ])
1718 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1719   AC_DEFINE(HAVE_BUILTIN_MEMSET)
1720 fi
1721
1722 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1723 cat > conftest.c <<\EOF
1724 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1725 char *foo (const char *a, const char *b)
1726 {
1727   return __builtin_strstr (a, b);
1728 }
1729 EOF
1730 dnl
1731 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1732 then
1733   libc_cv_gcc_builtin_redirection=yes
1734 else
1735   libc_cv_gcc_builtin_redirection=no
1736 fi
1737 rm -f conftest* ])
1738 if test "$libc_cv_gcc_builtin_redirection" = no; then
1739   AC_MSG_ERROR([support for the symbol redirection needed])
1740 fi
1741
1742 dnl Check whether the compiler supports the __thread keyword.
1743 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1744 [cat > conftest.c <<\EOF
1745 __thread int a = 42;
1746 EOF
1747 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1748   libc_cv_gcc___thread=yes
1749 else
1750   libc_cv_gcc___thread=no
1751 fi
1752 rm -f conftest*])
1753 if test "$libc_cv_gcc___thread" = no; then
1754   AC_MSG_ERROR([support for the __thread keyword is required])
1755 fi
1756
1757 dnl Check whether the compiler supports the tls_model attribute.
1758 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1759 cat > conftest.c <<\EOF
1760 extern __thread int a __attribute__((tls_model ("initial-exec")));
1761 EOF
1762 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1763   libc_cv_gcc_tls_model_attr=yes
1764 else
1765   libc_cv_gcc_tls_model_attr=no
1766 fi
1767 rm -f conftest*])
1768 if test "$libc_cv_gcc_tls_model_attr" = no; then
1769   AC_MSG_ERROR([support for the tls_model attribute is required])
1770 fi
1771
1772 dnl Determine how to disable generation of FMA instructions.
1773 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1774                libc_cv_cc_nofma, [dnl
1775 libc_cv_cc_nofma=
1776 for opt in -ffp-contract=off -mno-fused-madd; do
1777   LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1778 done])
1779 AC_SUBST(libc_cv_cc_nofma)
1780
1781 if test -n "$submachine"; then
1782   AC_CACHE_CHECK([for compiler option for CPU variant],
1783                  libc_cv_cc_submachine, [dnl
1784   libc_cv_cc_submachine=no
1785   for opt in "-march=$submachine" "-mcpu=$submachine"; do
1786     LIBC_TRY_CC_OPTION([$opt], [
1787       libc_cv_cc_submachine="$opt"
1788       break], [])
1789   done])
1790   if test "x$libc_cv_cc_submachine" = xno; then
1791     AC_MSG_ERROR([${CC-cc} does not support $submachine])
1792   fi
1793 fi
1794 AC_SUBST(libc_cv_cc_submachine)
1795
1796 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1797 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1798 cat > conftest.c <<EOF
1799 void
1800 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1801 foo (void) {}
1802 EOF
1803 libc_cv_cc_loop_to_function=no
1804 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1805 then
1806   libc_cv_cc_loop_to_function=yes
1807 fi
1808 rm -f conftest*])
1809 if test $libc_cv_cc_loop_to_function = yes; then
1810   AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1811 fi
1812 AC_SUBST(libc_cv_cc_loop_to_function)
1813
1814 dnl Check whether we have the gd library available.
1815 AC_MSG_CHECKING(for libgd)
1816 if test "$with_gd" != "no"; then
1817   old_CFLAGS="$CFLAGS"
1818   CFLAGS="$CFLAGS $libgd_include"
1819   old_LDFLAGS="$LDFLAGS"
1820   LDFLAGS="$LDFLAGS $libgd_ldflags"
1821   old_LIBS="$LIBS"
1822   LIBS="$LIBS -lgd -lpng -lz -lm"
1823   AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1824   CFLAGS="$old_CFLAGS"
1825   LDFLAGS="$old_LDFLAGS"
1826   LIBS="$old_LIBS"
1827 else
1828   LIBGD=no
1829 fi
1830 AC_MSG_RESULT($LIBGD)
1831 AC_SUBST(LIBGD)
1832
1833 # SELinux detection
1834 if test x$with_selinux = xno ; then
1835   have_selinux=no;
1836 else
1837   # See if we have the SELinux library
1838   AC_CHECK_LIB(selinux, is_selinux_enabled,
1839                have_selinux=yes, have_selinux=no)
1840   if test x$with_selinux = xyes ; then
1841     if test x$have_selinux = xno ; then
1842       AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1843     fi
1844   fi
1845 fi
1846 # Check if we're building with SELinux support.
1847 if test "x$have_selinux" = xyes; then
1848   AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1849
1850   # See if we have the libaudit library
1851   AC_CHECK_LIB(audit, audit_log_user_avc_message,
1852                have_libaudit=yes, have_libaudit=no)
1853   if test "x$have_libaudit" = xyes; then
1854     AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1855   fi
1856   AC_SUBST(have_libaudit)
1857
1858   # See if we have the libcap library
1859   AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1860   if test "x$have_libcap" = xyes; then
1861     AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1862   fi
1863   AC_SUBST(have_libcap)
1864 fi
1865 AC_SUBST(have_selinux)
1866
1867 dnl check for the size of 'long double'.
1868 AC_CHECK_SIZEOF(long double, 0)
1869 sizeof_long_double=$ac_cv_sizeof_long_double
1870 AC_SUBST(sizeof_long_double)
1871
1872 CPPUNDEFS=
1873 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1874 dnl Since we are building the implementations of the fortified functions here,
1875 dnl having the macro defined interacts very badly.
1876 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1877 [AC_TRY_COMPILE([], [
1878 #ifdef _FORTIFY_SOURCE
1879 # error bogon
1880 #endif],
1881                 [libc_cv_predef_fortify_source=no],
1882                 [libc_cv_predef_fortify_source=yes])])
1883 if test $libc_cv_predef_fortify_source = yes; then
1884   CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1885 fi
1886 AC_SUBST(CPPUNDEFS)
1887
1888 dnl Check for silly hacked compilers inserting -fstack-protector.
1889 dnl This breaks badly for the early startup code we compile, since
1890 dnl the compiled code can refer to a magic machine-dependent location
1891 dnl for the canary value before we have sufficient setup for that to
1892 dnl work.  It's also questionable to build all of libc with this flag
1893 dnl even when you're doing that for most applications you build, since
1894 dnl libc's code is so heavily-used and performance-sensitive.  If we
1895 dnl ever really want to make that work, it should be enabled explicitly
1896 dnl in the libc build, not inherited from implicit compiler settings.
1897 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1898                libc_cv_predef_stack_protector, [
1899 AC_TRY_COMPILE([extern void foobar (char *);],
1900                [char large_array[2048]; foobar (large_array);], [
1901 libc_undefs=`$NM -u conftest.o |
1902   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1903     2>&AS_MESSAGE_LOG_FD` || {
1904   AC_MSG_ERROR([confusing output from $NM -u])
1905 }
1906 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1907 # On some architectures, there are architecture-specific undefined
1908 # symbols (resolved by the linker), so filter out unknown symbols.
1909 # This will fail to produce the correct result if the compiler
1910 # defaults to -fstack-protector but this produces an undefined symbol
1911 # other than __stack_chk_fail.  However, compilers like that have not
1912 # been encountered in practice.
1913 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1914 case "$libc_undefs" in
1915 foobar) libc_cv_predef_stack_protector=no ;;
1916 '__stack_chk_fail
1917 foobar') libc_cv_predef_stack_protector=yes ;;
1918 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1919 esac],
1920                [AC_MSG_ERROR([test compilation failed])])
1921 ])
1922 libc_extra_cflags=
1923 if test $libc_cv_predef_stack_protector = yes; then
1924   libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1925 fi
1926 libc_extra_cppflags=
1927
1928 # Some linkers on some architectures support __ehdr_start but with
1929 # bugs.  Make sure usage of it does not create relocations in the
1930 # output (as the linker should resolve them all for us).
1931 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1932                libc_cv_ehdr_start, [
1933 old_CFLAGS="$CFLAGS"
1934 old_LDFLAGS="$LDFLAGS"
1935 old_LIBS="$LIBS"
1936 CFLAGS="$CFLAGS -fPIC"
1937 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1938 LIBS=
1939 AC_LINK_IFELSE([AC_LANG_SOURCE([
1940 typedef struct {
1941   char foo;
1942   long val;
1943 } Ehdr;
1944 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1945 long ehdr (void) { return __ehdr_start.val; }
1946 ])],
1947                [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1948                   libc_cv_ehdr_start=broken
1949                 else
1950                   libc_cv_ehdr_start=yes
1951                 fi], [libc_cv_ehdr_start=no])
1952 CFLAGS="$old_CFLAGS"
1953 LDFLAGS="$old_LDFLAGS"
1954 LIBS="$old_LIBS"
1955 ])
1956 if test "$libc_cv_ehdr_start" = yes; then
1957   AC_DEFINE([HAVE_EHDR_START])
1958 elif test "$libc_cv_ehdr_start" = broken; then
1959   AC_MSG_WARN([linker is broken -- you should upgrade])
1960 fi
1961
1962 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1963                libc_cv_builtin_trap, [dnl
1964 libc_cv_builtin_trap=no
1965 AC_TRY_COMPILE([], [__builtin_trap ()], [
1966 libc_undefs=`$NM -u conftest.o |
1967   LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1968     2>&AS_MESSAGE_LOG_FD` || {
1969   AC_MSG_ERROR([confusing output from $NM -u])
1970 }
1971 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1972 if test -z "$libc_undefs"; then
1973   libc_cv_builtin_trap=yes
1974 fi])])
1975 if test $libc_cv_builtin_trap = yes; then
1976   AC_DEFINE([HAVE_BUILTIN_TRAP])
1977 fi
1978
1979 ### End of automated tests.
1980 ### Now run sysdeps configure fragments.
1981
1982 # They also can set these variables.
1983 use_ldconfig=no
1984 ldd_rewrite_script=no
1985 libc_cv_sysconfdir=$sysconfdir
1986 libc_cv_localstatedir=$localstatedir
1987 libc_cv_gcc_unwind_find_fde=no
1988 libc_cv_idn=no
1989
1990 # Iterate over all the sysdep directories we will use, running their
1991 # configure fragments.
1992 for dir in $sysnames; do
1993   case $dir in
1994     /*) dest=$dir ;;
1995     *)  dest=$srcdir/$dir ;;
1996   esac
1997   if test -r $dest/configure; then
1998     AC_MSG_RESULT(running configure fragment for $dir)
1999     . $dest/configure
2000   fi
2001 done
2002
2003 if test x"$build_mathvec" = xnotset; then
2004   build_mathvec=no
2005 fi
2006 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
2007
2008 AC_SUBST(libc_extra_cflags)
2009 AC_SUBST(libc_extra_cppflags)
2010
2011 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2012   AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2013 fi
2014 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2015
2016 # A sysdeps configure fragment can reset this if IFUNC is not actually
2017 # usable even though the assembler knows how to generate the symbol type.
2018 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2019   AC_DEFINE(HAVE_IFUNC)
2020 fi
2021
2022 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2023 # configure fragment can override the value to prevent this AC_DEFINE.
2024 AC_SUBST(use_nscd)
2025 if test "x$use_nscd" != xno; then
2026   AC_DEFINE([USE_NSCD])
2027 fi
2028 if test "x$build_nscd" = xdefault; then
2029   build_nscd=$use_nscd
2030 fi
2031
2032 # Test for old glibc 2.0.x headers so that they can be removed properly
2033 # Search only in includedir.
2034 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2035 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2036 then
2037   old_glibc_headers=yes
2038 else
2039   old_glibc_headers=no
2040 fi
2041 AC_MSG_RESULT($old_glibc_headers)
2042 if test ${old_glibc_headers} = yes; then
2043   AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2044   AC_MSG_WARN(*** be removed.)
2045 fi
2046 AC_SUBST(old_glibc_headers)
2047
2048 AC_SUBST(libc_cv_slibdir)
2049 AC_SUBST(libc_cv_rtlddir)
2050 AC_SUBST(libc_cv_localedir)
2051 AC_SUBST(libc_cv_sysconfdir)
2052 AC_SUBST(libc_cv_localstatedir)
2053 AC_SUBST(libc_cv_rootsbindir)
2054 AC_SUBST(libc_cv_forced_unwind)
2055
2056 if test x$use_ldconfig = xyes; then
2057   AC_DEFINE(USE_LDCONFIG)
2058 fi
2059 AC_SUBST(use_ldconfig)
2060 AC_SUBST(ldd_rewrite_script)
2061
2062 AC_SUBST(static)
2063 AC_SUBST(shared)
2064
2065 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2066 [libc_cv_pic_default=yes
2067 cat > conftest.c <<EOF
2068 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2069 # error PIC is default.
2070 #endif
2071 EOF
2072 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2073   libc_cv_pic_default=no
2074 fi
2075 rm -f conftest.*])
2076 AC_SUBST(libc_cv_pic_default)
2077
2078 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
2079 [libc_cv_pie_default=yes
2080 cat > conftest.c <<EOF
2081 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
2082 # error PIE is default.
2083 #endif
2084 EOF
2085 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2086   libc_cv_pie_default=no
2087 fi
2088 rm -f conftest.*])
2089 AC_SUBST(libc_cv_pie_default)
2090
2091 AC_SUBST(profile)
2092 AC_SUBST(static_nss)
2093
2094 AC_SUBST(DEFINES)
2095
2096 dnl See sysdeps/mach/configure.ac for this variable.
2097 AC_SUBST(mach_interface_list)
2098
2099 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2100 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2101 AC_SUBST(VERSION)
2102 AC_SUBST(RELEASE)
2103
2104 AC_CONFIG_FILES([config.make Makefile])
2105 AC_CONFIG_COMMANDS([default],[[
2106 case $CONFIG_FILES in *config.make*)
2107 echo "$config_vars" >> config.make;;
2108 esac
2109 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2110 AC_OUTPUT