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])
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])
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 */'])])
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 "$CPP"; then
31 if test -z "$CPP"; then
37 # We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf
39 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
40 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
42 dnl This is here so we can set $subdirs directly based on configure fragments.
48 if test $host != $build; then
49 AC_CHECK_PROGS(BUILD_CC, gcc cc)
51 AC_SUBST(cross_compiling)
53 # We need the C++ compiler only for testing.
55 AC_CHECK_TOOL(READELF, readelf, false)
57 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
58 AC_MSG_ERROR([you must configure in a separate build directory])
61 # This will get text that should go into config.make.
64 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
66 AC_HELP_STRING([--with-gd=DIR],
67 [find libgd include dir and library with prefix DIR]),
71 *) libgd_include="-I$withval/include"
72 libgd_ldflags="-L$withval/lib" ;;
75 AC_ARG_WITH([gd-include],
76 AC_HELP_STRING([--with-gd-include=DIR],
77 [find libgd include files in DIR]),
79 case "$with_gd_include" in
81 *) libgd_include="-I$withval" ;;
85 AC_HELP_STRING([--with-gd-lib=DIR],
86 [find libgd library files in DIR]),
88 case "$with_gd_lib" in
90 *) libgd_ldflags="-L$withval" ;;
94 if test -n "$libgd_include"; then
95 config_vars="$config_vars
96 CFLAGS-memusagestat.c = $libgd_include"
98 if test -n "$libgd_ldflags"; then
99 config_vars="$config_vars
100 libgd-LDFLAGS = $libgd_ldflags"
103 dnl Arguments to specify presence of other packages/features.
105 AC_HELP_STRING([--with-fp],
106 [if using floating-point hardware @<:@default=yes@:>@]),
110 AC_ARG_WITH([binutils],
111 AC_HELP_STRING([--with-binutils=PATH],
112 [specify location of binutils (as and ld)]),
113 [path_binutils=$withval],
115 AC_ARG_WITH([selinux],
116 AC_HELP_STRING([--with-selinux],
117 [if building with SELinux support]),
118 [with_selinux=$withval],
121 AC_ARG_WITH([headers],
122 AC_HELP_STRING([--with-headers=PATH],
123 [location of system headers to use
124 (for example /usr/src/linux/include)
125 @<:@default=compiler default@:>@]),
126 [sysheaders=$withval],
130 AC_SUBST(use_default_link)
131 AC_ARG_WITH([default-link],
132 AC_HELP_STRING([--with-default-link],
133 [do not use explicit linker scripts]),
134 [use_default_link=$withval],
135 [use_default_link=default])
137 AC_ARG_ENABLE([sanity-checks],
138 AC_HELP_STRING([--disable-sanity-checks],
139 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
140 [enable_sanity=$enableval],
143 AC_ARG_ENABLE([shared],
144 AC_HELP_STRING([--enable-shared],
145 [build shared library @<:@default=yes if GNU ld@:>@]),
148 AC_ARG_ENABLE([profile],
149 AC_HELP_STRING([--enable-profile],
150 [build profiled library @<:@default=no@:>@]),
151 [profile=$enableval],
154 AC_ARG_ENABLE([oldest-abi],
155 AC_HELP_STRING([--enable-oldest-abi=ABI],
156 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
157 [oldest_abi=$enableval],
159 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
162 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
166 AC_ARG_ENABLE([hardcoded-path-in-tests],
167 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
168 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
169 [hardcoded_path_in_tests=$enableval],
170 [hardcoded_path_in_tests=no])
171 AC_SUBST(hardcoded_path_in_tests)
173 AC_ARG_ENABLE([stackguard-randomization],
174 AC_HELP_STRING([--enable-stackguard-randomization],
175 [initialize __stack_chk_guard canary with a random number at program start]),
176 [enable_stackguard_randomize=$enableval],
177 [enable_stackguard_randomize=no])
178 if test "$enable_stackguard_randomize" = yes; then
179 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
182 AC_ARG_ENABLE([lock-elision],
183 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
184 [Enable lock elision for pthread mutexes by default]),
185 [enable_lock_elision=$enableval],
186 [enable_lock_elision=no])
187 if test "$enable_lock_elision" = yes ; then
188 AC_DEFINE(ENABLE_LOCK_ELISION)
191 dnl Generic infrastructure for drop-in additions to libc.
192 AC_ARG_ENABLE([add-ons],
193 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
194 [configure and build add-ons in DIR1,DIR2,...
195 search for add-ons if no parameter given]),
196 , [enable_add_ons=yes])
198 AC_ARG_ENABLE([hidden-plt],
199 AC_HELP_STRING([--disable-hidden-plt],
200 [do not hide internal function calls to avoid PLT]),
203 if test "x$hidden" = xno; then
207 AC_ARG_ENABLE([bind-now],
208 AC_HELP_STRING([--enable-bind-now],
209 [disable lazy relocations in DSOs]),
210 [bindnow=$enableval],
214 dnl On some platforms we cannot use dynamic loading. We must provide
215 dnl static NSS modules.
216 AC_ARG_ENABLE([static-nss],
217 AC_HELP_STRING([--enable-static-nss],
218 [build static NSS modules @<:@default=no@:>@]),
219 [static_nss=$enableval],
221 dnl Enable static NSS also if we build no shared objects.
222 if test x"$static_nss" = xyes || test x"$shared" = xno; then
224 AC_DEFINE(DO_STATIC_NSS)
227 AC_ARG_ENABLE([force-install],
228 AC_HELP_STRING([--disable-force-install],
229 [don't force installation of files from this package, even if they are older than the installed files]),
230 [force_install=$enableval],
232 AC_SUBST(force_install)
234 AC_ARG_ENABLE([maintainer-mode],
235 AC_HELP_STRING([--enable-maintainer-mode],
236 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
237 [maintainer=$enableval],
240 dnl On some platforms we allow dropping compatibility with all kernel
242 AC_ARG_ENABLE([kernel],
243 AC_HELP_STRING([--enable-kernel=VERSION],
244 [compile for compatibility with kernel not older than VERSION]),
245 [minimum_kernel=$enableval],
247 dnl Prevent unreasonable values.
248 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
249 # Better nothing than this.
252 if test "$minimum_kernel" = current; then
253 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
257 dnl For the development we sometimes want gcc to issue even more warnings.
258 dnl This is not the default since many of the extra warnings are not
260 AC_ARG_ENABLE([all-warnings],
261 AC_HELP_STRING([--enable-all-warnings],
262 [enable all useful warnings gcc can issue]),
263 [all_warnings=$enableval],
265 AC_SUBST(all_warnings)
267 AC_ARG_ENABLE([multi-arch],
268 AC_HELP_STRING([--enable-multi-arch],
269 [enable single DSO with optimizations for multiple architectures]),
270 [multi_arch=$enableval],
271 [multi_arch=default])
273 AC_ARG_ENABLE([nss-crypt],
274 AC_HELP_STRING([--enable-nss-crypt],
275 [enable libcrypt to use nss]),
276 [nss_crypt=$enableval],
278 if test x$nss_crypt = xyes; then
279 nss_includes=-I$(nss-config --includedir 2>/dev/null)
280 if test $? -ne 0; then
281 AC_MSG_ERROR([cannot find include directory with nss-config])
284 CFLAGS="$CFLAGS $nss_includes"
285 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
287 #include <nsslowhash.h>
288 void f (void) { NSSLOW_Init (); }])],
289 libc_cv_nss_crypt=yes,
291 cannot find NSS headers with lowlevel hash function interfaces]))
293 LIBS="$LIBS -lfreebl3"
294 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
296 #include <nsslowhash.h>],
298 libc_cv_nss_crypt=yes,
300 cannot link program using lowlevel NSS hash functions]))
306 AC_SUBST(libc_cv_nss_crypt)
309 AC_ARG_ENABLE([obsolete-rpc],
310 AC_HELP_STRING([--enable-obsolete-rpc],
311 [build and install the obsolete RPC code for link-time usage]),
312 [link_obsolete_rpc=$enableval],
313 [link_obsolete_rpc=no])
314 AC_SUBST(link_obsolete_rpc)
316 if test "$link_obsolete_rpc" = yes; then
317 AC_DEFINE(LINK_OBSOLETE_RPC)
320 AC_ARG_ENABLE([systemtap],
321 [AS_HELP_STRING([--enable-systemtap],
322 [enable systemtap static probe points @<:@default=no@:>@])],
323 [systemtap=$enableval],
325 if test "x$systemtap" != xno; then
326 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
328 CFLAGS="-std=gnu99 $CFLAGS"
329 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
330 void foo (int i, void *p)
332 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
333 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
334 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
335 CFLAGS="$old_CFLAGS"])
336 if test $libc_cv_sdt = yes; then
337 AC_DEFINE([USE_STAP_PROBE])
338 elif test "x$systemtap" != xauto; then
339 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
343 AC_ARG_ENABLE([build-nscd],
344 [AS_HELP_STRING([--disable-build-nscd],
345 [disable building and installing the nscd daemon])],
346 [build_nscd=$enableval],
347 [build_nscd=default])
350 # Note the use of $use_nscd is near the bottom of the file.
351 AC_ARG_ENABLE([nscd],
352 [AS_HELP_STRING([--disable-nscd],
353 [library functions will not contact the nscd daemon])],
354 [use_nscd=$enableval],
357 AC_ARG_ENABLE([pt_chown],
358 [AS_HELP_STRING([--enable-pt_chown],
359 [Enable building and installing pt_chown])],
360 [build_pt_chown=$enableval],
362 AC_SUBST(build_pt_chown)
363 if test "$build_pt_chown" = yes; then
364 AC_DEFINE(HAVE_PT_CHOWN)
367 # The way shlib-versions is used to generate soversions.mk uses a
368 # fairly simplistic model for name recognition that can't distinguish
369 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
370 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
371 # tell. This doesn't get used much beyond that, so it's fairly safe.
376 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
380 # We keep the original values in `$config_*' and never modify them, so we
381 # can write them unchanged into config.make. Everything else uses
382 # $machine, $vendor, and $os, and changes them whenever convenient.
383 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
385 # Don't allow vendor == "unknown"
386 test "$config_vendor" = unknown && config_vendor=
387 config_os="`echo $config_os | sed 's/^unknown-//'`"
389 # Some configurations imply other options.
392 # The configure fragment of an add-on port can modify these to supplement
393 # or override the table in the case statement below. No fragment should
394 # ever change the config_* variables, however.
395 machine=$config_machine
396 vendor=$config_vendor
400 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
402 if test "$machine" = rs6000; then
406 # Braindead PowerPC box with absolutely no FPU.
407 case "$machine-$host_os" in
415 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
418 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
420 *) submachine="$withval" ;;
424 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
425 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
427 # An add-on can set this when it wants to disable the sanity check below.
430 dnl Having this here, though empty, makes sure that if add-ons' fragments
431 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
432 dnl our AC_OUTPUT will actually use it.
435 case "$enable_add_ons" in
438 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
439 sed 's@/[[^/]]*$@@' | sort | uniq`
440 add_ons_automatic=yes
442 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
443 add_ons_automatic=no ;;
449 if test x"$add_ons" != x; then
450 for f in $add_ons; do
455 *** It seems that you're using an old \`crypt' add-on. crypt is now
456 *** part of glibc and using the old add-on will not work with this
457 *** release. Start again with fresh sources and without the old
458 *** \`crypt' add-on.])
462 *** It seems that you're using an old \`localedata' add-on. localedata
463 *** is now part of glibc and using the old add-on will not work with
464 *** this release. Start again with fresh sources and without the old
465 *** \`localedata' add-on.])
470 # Now source each add-on's configure fragment.
471 # The fragments can use $srcdir/$libc_add_on to find themselves,
472 # and test $add_ons_automatic to see if they were explicitly requested.
473 # A fragment can clear (or even change) $libc_add_on to affect
474 # whether it goes into the list to be actually used in the build.
476 for libc_add_on in $add_ons; do
477 # Test whether such a directory really exists.
478 # It can be absolute, or relative to $srcdir, or relative to the build dir.
479 case "$libc_add_on" in
481 libc_add_on_srcdir=$libc_add_on
484 test -d "$srcdir/$libc_add_on" || {
485 if test -d "$libc_add_on"; then
486 libc_add_on="`pwd`/$libc_add_on"
488 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
491 libc_add_on_srcdir=$srcdir/$libc_add_on
495 libc_add_on_frag=$libc_add_on_srcdir/configure
496 libc_add_on_canonical=
497 libc_add_on_config_subdirs=
498 if test -r "$libc_add_on_frag"; then
499 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
500 libc_add_on_canonical=unknown
502 . "$libc_add_on_frag"
503 test -z "$libc_add_on" || {
504 configured_add_ons="$configured_add_ons $libc_add_on"
505 if test "x$libc_add_on_canonical" = xunknown; then
506 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
508 for d in $libc_add_on_subdirs; do
509 case "$libc_add_on" in
510 /*) subdir_srcdir="$libc_add_on" ;;
511 *) subdir_srcdir="\$(..)$libc_add_on" ;;
515 d="${libc_add_on_canonical:-$libc_add_on}"
521 subdir_srcdir="$subdir_srcdir/$d"
524 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
525 add_on_subdirs="$add_on_subdirs $d"
526 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
527 $d-srcdir = $subdir_srcdir"
529 for d in $libc_add_on_config_subdirs; do
532 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
534 if test ! -d "$libc_add_on_srcdir/$d"; then
535 AC_MSG_ERROR(fragment wants to configure missing directory $d)
537 case "$libc_add_on" in
539 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
541 subdirs="$subdirs $libc_add_on/$d"
545 if test -n "$libc_add_on"; then
546 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
547 use_add_ons="$use_add_ons $libc_add_on"
548 add_ons_pfx="$add_ons_pfx $libc_add_on/"
549 test -z "$libc_add_on_canonical" ||
550 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
553 # Use echo to strip excess whitespace.
554 add_ons="`echo $use_add_ons`"
557 AC_SUBST(add_on_subdirs)
561 ### I put this here to prevent those annoying emails from people who cannot
562 ### read and try to compile glibc on unsupported platforms. --drepper
564 ### By using the undocumented --enable-hacker-mode option for configure
565 ### one can skip this test to make the configuration not fail for unsupported
568 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
569 case "$machine-$host_os" in
573 echo "*** The GNU C library is currently not available for this platform."
574 echo "*** So far nobody cared to port it and if there is no volunteer it"
575 echo "*** might never happen. So, if you have interest to see glibc on"
576 echo "*** this platform visit"
577 echo "*** http://www.gnu.org/software/libc/porting.html"
578 echo "*** and join the group of porters"
584 dnl We need to use [ and ] for other purposes for a while now.
586 # Expand the configuration machine name into a subdirectory by architecture
587 # type and particular chip. If an add-on configure fragment already set
588 # base_machine, we don't change it.
589 test -n "$base_machine" || case "$machine" in
590 i[4567]86) base_machine=i386 machine=i386/$machine ;;
591 powerpc64*) base_machine=powerpc machine=powerpc/powerpc64 ;;
592 powerpc*) base_machine=powerpc machine=powerpc/powerpc32 ;;
593 s390) base_machine=s390 machine=s390/s390-32 ;;
594 s390x) base_machine=s390 machine=s390/s390-64 ;;
595 sh3*) base_machine=sh machine=sh/sh3 ;;
596 sh4*) base_machine=sh machine=sh/sh4 ;;
598 base_machine=sparc machine=sparc/sparc32 ;;
599 sparcv8 | supersparc | hypersparc)
600 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
601 sparcv8plus | sparcv8plusa | sparcv9)
602 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
603 sparcv8plusb | sparcv9b)
604 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
606 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
608 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
610 base_machine=sparc machine=sparc/sparc64 ;;
612 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
614 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
616 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
617 *) base_machine=$machine ;;
620 AC_SUBST(base_machine)
622 if test "$base_machine" = "i386"; then
623 AC_DEFINE(USE_REGPARMS)
626 # For the multi-arch option we need support in the assembler & linker.
627 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
628 libc_cv_ld_gnu_indirect_function, [dnl
629 cat > conftest.S <<EOF
630 .type foo,%gnu_indirect_function
643 libc_cv_ld_gnu_indirect_function=no
644 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
645 -nostartfiles -nostdlib \
646 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
647 # Do a link to see if the backend supports IFUNC relocs.
648 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
649 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
650 libc_cv_ld_gnu_indirect_function=yes
655 AC_MSG_CHECKING(whether .text pseudo-op must be used)
656 AC_CACHE_VAL(libc_cv_dot_text, [dnl
657 cat > conftest.s <<EOF
661 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
662 libc_cv_dot_text=.text
665 if test -z "$libc_cv_dot_text"; then
671 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
672 if test x"$multi_arch" = xyes; then
673 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
679 if test x"$multi_arch" != xno; then
680 multi_arch_d=/multiarch
683 # Compute the list of sysdep directories for this configuration.
684 # This can take a while to compute.
685 sysdep_dir=$srcdir/sysdeps
686 AC_MSG_CHECKING(sysdep dirs)
687 dnl We need to use [ and ] for other purposes for a while now.
689 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
690 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
692 test "x$base_os" != x || case "$os" in
699 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
702 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
706 o=`echo $tail | sed 's/[0-9]*$//'`
707 if test $o != $tail; then
710 # For linux-gnu, try linux-gnu, then linux.
711 o=`echo $tail | sed 's/-.*$//'`
712 if test $o != $tail; then
716 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
719 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
725 # For sparc/sparc32, try sparc/sparc32 and then sparc.
727 tail=$machine${submachine:+/$submachine}
728 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
730 # Prepend the machine's FPU directory unless --without-fp.
731 if test "$with_fp" = yes; then
736 # For each machine term, try it with and then without /multiarch.
737 for try_fpu in $maybe_fpu ''; do
738 for try_multi in $multi_arch_d ''; do
739 mach="$mach /$1$try_fpu$try_multi"
745 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
748 # Find what sysdep directories exist.
751 for b in $base ''; do
752 for m0 in $mach ''; do
753 for v in /$vendor ''; do
754 test "$v" = / && continue
755 for o in /$ostry ''; do
756 test "$o" = / && continue
757 for m in $mach ''; do
758 for d in $add_ons_pfx ''; do
759 for a in $add_ons_sfx ''; do
760 try_suffix="$m0$b$v$o$m"
761 if test -n "$try_suffix"; then
762 try_srcdir="${srcdir}/"
766 try="${d}sysdeps$try_suffix$a"
767 test -n "$enable_debug_configure" &&
768 echo "$0 [DEBUG]: try $try" >&2
769 if test -d "$try_srcdir$try"; then
770 sysnames="$sysnames $try"
771 { test -n "$o" || test -n "$b"; } && os_used=t
772 { test -n "$m" || test -n "$m0"; } && machine_used=t
774 x*/$submachine) submachine_used=t ;;
776 if test -n "$d"; then
777 case "$sysnames_add_ons" in
779 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
792 # If the assembler supports gnu_indirect_function symbol type and the
793 # architecture supports multi-arch, we enable multi-arch by default.
794 case $sysnames_add_ons$sysnames in
798 test x"$multi_arch" = xdefault && multi_arch=no
801 if test x"$multi_arch" != xno; then
802 AC_DEFINE(USE_MULTIARCH)
806 if test -z "$os_used" && test "$os" != none; then
807 AC_MSG_ERROR(Operating system $os is not supported.)
809 if test -z "$machine_used" && test "$machine" != none; then
810 AC_MSG_ERROR(The $machine is not supported.)
812 if test -z "$submachine_used" && test -n "$submachine"; then
813 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
817 # We have now validated the configuration.
819 # Expand the list of system names into a full list of directories
820 # from each element's parent name and Implies file (if present).
823 while test $# -gt 0; do
827 case " $names " in *" $name "*)
828 # Already in the list.
832 # Report each name as we discover it, so there is no long pause in output.
833 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
835 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
839 *) xsrcdir=$srcdir/ ;;
841 test -n "$enable_debug_configure" &&
842 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
844 for implies_file in Implies Implies-before Implies-after; do
845 implies_type=`echo $implies_file | sed s/-/_/`
846 eval ${implies_type}=
847 if test -f $xsrcdir$name/$implies_file; then
848 # Collect more names from the `Implies' file (removing comments).
849 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
850 for x in $implied_candidate; do
852 if test -d $xsrcdir$name_base/$x; then
853 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
856 for d in $add_ons_pfx ''; do
860 *) try_srcdir=$srcdir/ ;;
862 test -n "$enable_debug_configure" &&
863 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
864 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
866 eval "${implies_type}=\"\$${implies_type} \$try\""
868 case "$sysnames_add_ons" in
870 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
874 if test $found = no; then
875 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
881 # Add NAME to the list of names.
884 # Find the parent of NAME, using the empty string if it has none.
886 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
889 test -n "$enable_debug_configure" &&
890 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
891 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
893 # Add the names implied by NAME, and NAME's parent (if it has one), to
894 # the list of names to be processed (the argument list). We prepend the
895 # implied names to the list and append the parent. We want implied
896 # directories to come before further directories inferred from the
897 # configuration components; this ensures that for sysv4, unix/common
898 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
900 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
901 test -n "$sysnames" && set $sysnames
904 # Add the default directories.
905 default_sysnames="sysdeps/generic"
906 sysnames="$names $default_sysnames"
908 # The other names were emitted during the scan.
909 AC_MSG_RESULT($default_sysnames)
911 # Collect the list of add-ons that supply partial sysdeps trees.
913 for add_on in $add_ons; do
916 *) xsrcdir="$srcdir/" ;;
919 test -d "$xsrcdir$add_on/sysdeps" || {
920 case "$configured_add_ons " in
923 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
929 sysdeps_add_ons="$sysdeps_add_ons $add_on"
930 case "$sysnames_add_ons" in
933 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
938 for d in $sysnames; do
940 $add_on/sysdeps/*) ;;
943 (cd "$xsrcdir$d" && for f in *[[!~]]; do
947 test -d "$ff" || { test -e "$ff" && exit 88; }
951 test -d "$f" || { test -e "$f" && exit 88; }
955 if test $? -eq 88; then
960 if test $found = no; then
961 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
964 AC_SUBST(sysdeps_add_ons)
970 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
971 # The makefiles need to use a different form to find it in $srcdir.
972 INSTALL='\$(..)./scripts/install-sh -c'
978 # Accept binutils 2.20 or newer.
979 AC_CHECK_PROG_VER(AS, $AS, --version,
980 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
981 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
982 AC_CHECK_PROG_VER(LD, $LD, --version,
983 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
984 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
986 # These programs are version sensitive.
988 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
989 [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
990 critic_missing="$critic_missing gcc")
991 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
992 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
993 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
995 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
996 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
997 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
998 MSGFMT=: aux_missing="$aux_missing msgfmt")
999 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1000 [GNU texinfo.* \([0-9][0-9.]*\)],
1001 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
1002 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1003 AC_CHECK_PROG_VER(SED, sed, --version,
1004 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1005 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1006 SED=: aux_missing="$aux_missing sed")
1007 AC_CHECK_PROG_VER(AWK, gawk, --version,
1008 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1009 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1011 AC_CHECK_TOOL(NM, nm, false)
1013 if test "x$maintainer" = "xyes"; then
1014 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1015 case "x$AUTOCONF" in
1016 xno|x|x:) AUTOCONF=no ;;
1019 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1020 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1021 libc_cv_autoconf_works=yes
1023 libc_cv_autoconf_works=no
1025 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1028 if test "x$AUTOCONF" = xno; then
1029 aux_missing="$aux_missing autoconf"
1033 test -n "$critic_missing" && AC_MSG_ERROR([
1034 *** These critical programs are missing or too old:$critic_missing
1035 *** Check the INSTALL file for required versions.])
1037 test -n "$aux_missing" && AC_MSG_WARN([
1038 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1039 *** some features will be disabled.
1040 *** Check the INSTALL file for required versions.])
1042 # if using special system headers, find out the compiler's sekrit
1043 # header directory and add that to the list. NOTE: Only does the right
1044 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1045 if test -n "$sysheaders"; then
1046 SYSINCLUDES=-nostdinc
1047 for d in include include-fixed; do
1048 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1049 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1051 SYSINCLUDES="$SYSINCLUDES \
1052 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1053 if test -n "$CXX"; then
1055 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1056 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1057 test "x$cxxheaders" != x &&
1058 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1062 AC_SUBST(SYSINCLUDES)
1063 AC_SUBST(CXX_SYSINCLUDES)
1065 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1066 # since this would lead to problems installing/building glibc.
1067 # LD_LIBRARY_PATH contains the current directory if one of the following
1069 # - one of the terminals (":" and ";") is the first or last sign
1070 # - two terminals occur directly after each other
1071 # - the path contains an element with a dot in it
1072 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1074 case ${LD_LIBRARY_PATH} in
1075 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1076 ld_library_path_setting="contains current directory"
1079 ld_library_path_setting="ok"
1083 AC_MSG_RESULT($ld_library_path_setting)
1084 if test "$ld_library_path_setting" != "ok"; then
1086 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1087 *** building glibc. Please change the environment variable
1088 *** and run configure again.])
1091 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1092 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1093 libc_cv_gcc_static_libgcc=
1095 libc_cv_gcc_static_libgcc=-static-libgcc
1097 AC_SUBST(libc_cv_gcc_static_libgcc)
1099 AC_PATH_PROG(BASH_SHELL, bash, no)
1100 if test "$BASH_SHELL" != no &&
1101 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1102 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1103 libc_cv_have_bash2=yes
1105 libc_cv_have_bash2=no
1107 AC_SUBST(libc_cv_have_bash2)
1109 dnl We need a ksh compatible shell for tzselect.
1110 if test "$BASH_SHELL" = no; then
1111 AC_PATH_PROG(KSH, ksh, no)
1112 if test "$KSH" = no; then
1115 libc_cv_have_ksh=yes
1120 libc_cv_have_ksh=yes
1122 AC_SUBST(libc_cv_have_ksh)
1124 AC_PATH_PROG(PERL, perl, no)
1125 if test "$PERL" != no &&
1126 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1129 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1130 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1131 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1133 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1135 [#define __need_size_t
1136 #define __need_wchar_t
1139 #include <stddef.h>], [size_t size; wchar_t wchar;
1141 #error stddef.h ignored __need_*
1143 if (&size == NULL || &wchar == NULL) abort ();],
1144 libc_cv_friendly_stddef=yes,
1145 libc_cv_friendly_stddef=no)])
1146 if test $libc_cv_friendly_stddef = yes; then
1147 config_vars="$config_vars
1148 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1151 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1152 libc_cv_need_minus_P, [dnl
1153 cat > conftest.S <<EOF
1154 #include "confdefs.h"
1155 /* Nothing whatsoever. */
1157 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1158 libc_cv_need_minus_P=no
1160 libc_cv_need_minus_P=yes
1163 if test $libc_cv_need_minus_P = yes; then
1164 config_vars="$config_vars
1165 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1168 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1169 cat > conftest.s <<EOF
1172 .set glibc_conftest_frobozz,foo
1173 .globl glibc_conftest_frobozz
1175 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1176 # (but it doesn't work), so we must do a linking check to be sure.
1177 cat > conftest1.c <<\EOF
1178 extern int glibc_conftest_frobozz;
1179 void _start() { glibc_conftest_frobozz = 1; }
1181 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1182 -nostartfiles -nostdlib \
1183 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1184 libc_cv_asm_set_directive=yes
1186 libc_cv_asm_set_directive=no
1189 if test $libc_cv_asm_set_directive = yes; then
1190 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1193 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1194 libc_cv_asm_unique_object, [dnl
1195 cat > conftest.s <<EOF
1198 .type _sym, %gnu_unique_object
1200 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1201 libc_cv_asm_unique_object=yes
1203 libc_cv_asm_unique_object=no
1206 if test $libc_cv_asm_unique_object = yes; then
1207 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1210 AC_CACHE_CHECK(for .previous assembler directive,
1211 libc_cv_asm_previous_directive, [dnl
1212 cat > conftest.s <<EOF
1213 .section foo_section
1216 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1217 libc_cv_asm_previous_directive=yes
1219 libc_cv_asm_previous_directive=no
1222 if test $libc_cv_asm_previous_directive = yes; then
1223 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1225 AC_CACHE_CHECK(for .popsection assembler directive,
1226 libc_cv_asm_popsection_directive, [dnl
1227 cat > conftest.s <<EOF
1228 .pushsection foo_section
1231 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1232 libc_cv_asm_popsection_directive=yes
1234 libc_cv_asm_popsection_directive=no
1237 if test $libc_cv_asm_popsection_directive = yes; then
1238 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1241 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1242 libc_cv_asm_protected_directive, [dnl
1243 cat > conftest.s <<EOF
1249 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1250 libc_cv_asm_protected_directive=yes
1252 AC_MSG_ERROR(assembler support for symbol visibility is required)
1256 if test $libc_cv_asm_protected_directive = yes; then
1257 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1258 libc_cv_visibility_attribute,
1259 [cat > conftest.c <<EOF
1260 int foo __attribute__ ((visibility ("hidden"))) = 1;
1261 int bar __attribute__ ((visibility ("protected"))) = 1;
1263 libc_cv_visibility_attribute=no
1264 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1265 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1266 if grep '\.protected.*bar' conftest.s >/dev/null; then
1267 libc_cv_visibility_attribute=yes
1271 rm -f conftest.{c,s}
1273 if test $libc_cv_visibility_attribute != yes; then
1274 AC_MSG_ERROR(compiler support for visibility attribute is required)
1278 if test $libc_cv_visibility_attribute = yes; then
1279 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1280 libc_cv_broken_visibility_attribute,
1281 [cat > conftest.c <<EOF
1283 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1284 int bar (int x) { return x; }
1286 libc_cv_broken_visibility_attribute=yes
1287 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1289 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1291 libc_cv_broken_visibility_attribute=no
1294 rm -f conftest.c conftest.s
1296 if test $libc_cv_broken_visibility_attribute = yes; then
1297 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1301 AC_CACHE_CHECK(for broken __attribute__((alias())),
1302 libc_cv_broken_alias_attribute,
1303 [cat > conftest.c <<EOF
1304 extern int foo (int x) __asm ("xyzzy");
1305 int bar (int x) { return x; }
1306 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1308 extern __typeof (dfoo) dfoo __asm ("abccb");
1311 libc_cv_broken_alias_attribute=yes
1312 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1313 if grep 'xyzzy' conftest.s >/dev/null &&
1314 grep 'abccb' conftest.s >/dev/null; then
1315 libc_cv_broken_alias_attribute=no
1318 rm -f conftest.c conftest.s
1320 if test $libc_cv_broken_alias_attribute = yes; then
1321 AC_MSG_ERROR(working alias attribute support required)
1324 if test $libc_cv_visibility_attribute = yes; then
1325 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1326 libc_cv_have_sdata_section,
1327 [echo "int i;" > conftest.c
1328 libc_cv_have_sdata_section=no
1329 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1330 | grep '\.sdata' >/dev/null; then
1331 libc_cv_have_sdata_section=yes
1333 rm -f conftest.c conftest.so
1335 if test $libc_cv_have_sdata_section = yes; then
1336 AC_DEFINE(HAVE_SDATA_SECTION)
1340 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1341 libc_cv_initfini_array, [dnl
1342 LIBC_TRY_LINK_STATIC([
1343 int foo (void) { return 1; }
1344 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1346 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1347 libc_cv_initfini_array=yes
1349 libc_cv_initfini_array=no
1351 [libc_cv_initfini_array=no])
1353 if test $libc_cv_initfini_array != yes; then
1354 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1357 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1358 libc_cv_ctors_header, [dnl
1359 libc_cv_ctors_header=yes
1360 LIBC_TRY_LINK_STATIC([
1361 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1362 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1365 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1366 { gsub(/\@<:@ */, "@<:@") }
1367 $2 == ".ctors" || $2 == ".dtors" {
1368 size = strtonum("0x" $6)
1369 align = strtonum("0x" $NF)
1371 stub@<:@$2@:>@ = size == align * 2
1374 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1375 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1376 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1378 '], [libc_cv_ctors_header=no])
1380 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1383 if test $libc_cv_ctors_header = no; then
1384 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1387 AC_CACHE_CHECK(for libunwind-support in compiler,
1388 libc_cv_cc_with_libunwind, [
1389 cat > conftest.c <<EOF
1390 int main (void) { return 0; }
1392 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1393 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1394 libc_cv_cc_with_libunwind=yes
1396 libc_cv_cc_with_libunwind=no
1399 AC_SUBST(libc_cv_cc_with_libunwind)
1400 if test $libc_cv_cc_with_libunwind = yes; then
1401 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1404 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1405 [libc_cv_z_nodelete=yes],
1406 [AC_MSG_ERROR(linker with -z nodelete support required)])
1408 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1409 [libc_cv_z_nodlopen=yes],
1410 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1412 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1413 [libc_cv_z_initfirst=yes],
1414 [AC_MSG_ERROR(linker with -z initfirst support required)])
1416 # Add-on fragments can set these for other machines.
1417 libc_commonpagesize=${libc_commonpagesize:-no}
1418 libc_relro_required=${libc_relro_required:-no}
1419 case "$base_machine" in
1420 i[[34567]]86 | x86_64 | powerpc* | s390*)
1421 libc_commonpagesize=0x1000
1422 libc_relro_required=yes
1425 libc_commonpagesize=0x2000
1426 libc_relro_required=yes
1430 if test $libc_commonpagesize != no; then
1431 AC_CACHE_CHECK(for -z relro option,
1432 libc_cv_z_relro, [dnl
1434 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1435 int _start (void) { return 42; }
1436 extern void _exit (int);
1437 /* Since these pointers are const, they should go in rodata.
1438 Since they refer to functions that have to be resolved by
1439 dynamic linking, they should instead go in RELRO data. */
1440 const void *const relro[] = { &_start, &_exit, 0 };
1441 /* GNU ld fails to produce RELRO data when it's very small and there is no
1442 normal writable data following it, or if only uninitialized (.bss) data
1443 follows it, or only very small writable data. */
1444 int data[0x10000] = { 1, };
1446 cat > conftest.awk <<\EOF
1449 commonpagesize = strtonum(commonpagesize)
1451 { print "LINE:", $0 > "/dev/stderr" }
1453 vaddr = strtonum($3)
1454 memsz = strtonum($6)
1456 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1457 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1458 result = (end % commonpagesize == 0) ? "yes" : "broken"
1460 END { print result }
1462 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1463 -fPIC -shared -o conftest.so conftest.c
1464 -nostartfiles -nostdlib
1465 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1466 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1468 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1469 conftest.ph > conftest.cps
1471 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1473 if { test "x$libc_relro_required" = xyes &&
1474 test "x$libc_cv_z_relro" != xyes
1477 AC_MSG_ERROR(linker with -z relro support required)
1480 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1483 AC_CACHE_CHECK(for -Bgroup option,
1484 libc_cv_Bgroup, [dnl
1485 cat > conftest.c <<EOF
1486 int _start (void) { return 42; }
1488 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1489 -fPIC -shared -o conftest.so conftest.c
1490 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1497 AC_SUBST(libc_cv_Bgroup)
1500 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1501 libc_cv_as_noexecstack, [dnl
1502 cat > conftest.c <<EOF
1505 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1506 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1507 && grep .note.GNU-stack conftest.s >/dev/null \
1508 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1509 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1511 libc_cv_as_noexecstack=yes
1513 libc_cv_as_noexecstack=no
1516 if test $libc_cv_as_noexecstack = yes; then
1517 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1519 AC_SUBST(ASFLAGS_config)
1521 AC_CACHE_CHECK(for -z combreloc,
1522 libc_cv_z_combreloc, [dnl
1523 cat > conftest.c <<EOF
1524 extern int bar (int);
1526 int foo (void) { return bar (mumble); }
1528 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1529 -fPIC -shared -o conftest.so conftest.c
1530 -nostdlib -nostartfiles
1531 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1533 dnl The following test is a bit weak. We must use a tool which can test
1534 dnl cross-platform since the gcc used can be a cross compiler. Without
1535 dnl introducing new options this is not easily doable. Instead use a tool
1536 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1537 dnl look for a section named .rel.dyn.
1538 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1539 libc_cv_z_combreloc=yes
1541 libc_cv_z_combreloc=no
1544 libc_cv_z_combreloc=no
1547 if test "$libc_cv_z_combreloc" = yes; then
1548 AC_DEFINE(HAVE_Z_COMBRELOC)
1550 AC_SUBST(libc_cv_z_combreloc)
1552 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1553 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1554 AC_SUBST(libc_cv_z_execstack)
1556 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1557 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1560 AC_SUBST(libc_cv_fpie)
1562 AC_CACHE_CHECK(for --hash-style option,
1563 libc_cv_hashstyle, [dnl
1564 cat > conftest.c <<EOF
1565 int _start (void) { return 42; }
1567 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1568 -fPIC -shared -o conftest.so conftest.c
1569 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1571 libc_cv_hashstyle=yes
1573 libc_cv_hashstyle=no
1576 AC_SUBST(libc_cv_hashstyle)
1578 # The linker's default -shared behavior is good enough if it
1579 # does these things that our custom linker scripts ensure that
1580 # all allocated NOTE sections come first.
1581 if test "$use_default_link" = default; then
1582 AC_CACHE_CHECK([for sufficient default -shared layout],
1583 libc_cv_use_default_link, [dnl
1584 libc_cv_use_default_link=no
1585 cat > conftest.s <<\EOF
1586 .section .note.a,"a",%note
1591 .section .note.b,"a",%note
1597 if AC_TRY_COMMAND([dnl
1598 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1599 ac_try=`$READELF -S conftest.so | sed -n \
1601 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1607 libc_seen_a=no libc_seen_b=no
1609 while test $# -ge 2 -a "$1" = NOTE; do
1611 .note.a) libc_seen_a=yes ;;
1612 .note.b) libc_seen_b=yes ;;
1616 case "$libc_seen_a$libc_seen_b" in
1618 libc_cv_use_default_link=yes
1621 echo >&AS_MESSAGE_LOG_FD "\
1622 $libc_seen_a$libc_seen_b from:
1628 use_default_link=$libc_cv_use_default_link
1631 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1632 if libc_cv_output_format=`
1633 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1637 libc_cv_output_format=
1639 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1640 AC_SUBST(libc_cv_output_format)
1642 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1643 cat > conftest.c <<EOF
1646 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1647 conftest.c 1>&AS_MESSAGE_LOG_FD])
1649 libc_cv_fno_toplevel_reorder=yes
1651 libc_cv_fno_toplevel_reorder=no
1654 if test $libc_cv_fno_toplevel_reorder = yes; then
1655 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1657 fno_unit_at_a_time=-fno-unit-at-a-time
1659 AC_SUBST(fno_unit_at_a_time)
1661 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1662 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1666 AC_SUBST(libc_cv_ssp)
1668 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1669 cat > conftest.c <<EOF
1671 #ifdef __GNUC_GNU_INLINE__
1672 main () { return 0;}
1677 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1678 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1680 libc_cv_gnu89_inline=yes
1682 libc_cv_gnu89_inline=no
1685 if test $libc_cv_gnu89_inline = yes; then
1686 gnu89_inline=-fgnu89-inline
1690 AC_SUBST(gnu89_inline)
1692 AC_CACHE_CHECK(whether cc puts quotes around section names,
1693 libc_cv_have_section_quotes,
1694 [cat > conftest.c <<EOF
1695 static const int foo
1696 __attribute__ ((section ("bar"))) = 1;
1698 if ${CC-cc} -S conftest.c -o conftest.s; then
1699 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1700 libc_cv_have_section_quotes=yes
1702 libc_cv_have_section_quotes=no
1705 libc_cv_have_section_quotes=unknown
1707 rm -f conftest.{c,s}
1709 if test $libc_cv_have_section_quotes = yes; then
1710 AC_DEFINE(HAVE_SECTION_QUOTES)
1713 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1715 cat > conftest.s <<EOF
1720 .weak bar; bar = foo
1722 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1723 libc_cv_asm_weak_directive=yes
1725 libc_cv_asm_weak_directive=no
1729 if test $libc_cv_asm_weak_directive = no; then
1730 AC_CACHE_CHECK(for assembler .weakext directive,
1731 libc_cv_asm_weakext_directive,
1733 cat > conftest.s <<EOF
1742 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1743 libc_cv_asm_weakext_directive=yes
1745 libc_cv_asm_weakext_directive=no
1751 if test $libc_cv_asm_weak_directive = yes; then
1752 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1753 elif test $libc_cv_asm_weakext_directive = yes; then
1754 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1757 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1759 sparc/sparc64*) cfi_offset=2047;;
1762 cat > conftest.s <<EOF
1764 .type func,%function
1768 .cfi_rel_offset 1, $cfi_offset
1771 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1772 libc_cv_asm_cfi_directives=yes
1774 libc_cv_asm_cfi_directives=no
1777 if test $libc_cv_asm_cfi_directives = yes; then
1778 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1781 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1782 cat > conftest.c <<\EOF
1787 dnl No \ in command here because it ends up inside ''.
1788 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1789 -nostdlib -nostartfiles -Wl,--no-whole-archive
1790 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1791 libc_cv_ld_no_whole_archive=yes
1793 libc_cv_ld_no_whole_archive=no
1796 if test $libc_cv_ld_no_whole_archive = no; then
1797 AC_MSG_ERROR([support for --no-whole-archive is needed])
1800 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1801 cat > conftest.c <<\EOF
1806 dnl No \ in command here because it ends up inside ''.
1807 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1808 -nostdlib -nostartfiles -fexceptions
1809 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1810 libc_cv_gcc_exceptions=yes
1812 libc_cv_gcc_exceptions=no
1815 if test $libc_cv_gcc_exceptions = yes; then
1816 exceptions=-fexceptions
1818 AC_SUBST(exceptions)dnl
1820 if test "$host_cpu" = powerpc ; then
1821 # Check for a bug present in at least versions 2.8.x of GCC
1822 # and versions 1.0.x of EGCS.
1823 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1824 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1825 libc_cv_c_asmcr0_bug='no',
1826 libc_cv_c_asmcr0_bug='yes')])
1827 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1828 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1832 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1833 cat > conftest.c <<\EOF
1836 __builtin_memset (x, 0, 1000);
1840 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1842 libc_cv_gcc_builtin_memset=no
1844 libc_cv_gcc_builtin_memset=yes
1847 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1848 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1851 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1852 cat > conftest.c <<\EOF
1853 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1854 char *foo (const char *a, const char *b)
1856 return __builtin_strstr (a, b);
1860 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1862 libc_cv_gcc_builtin_redirection=yes
1864 libc_cv_gcc_builtin_redirection=no
1867 if test "$libc_cv_gcc_builtin_redirection" = no; then
1868 AC_MSG_ERROR([support for the symbol redirection needed])
1871 dnl Check whether the compiler supports the __thread keyword.
1872 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1873 [cat > conftest.c <<\EOF
1874 __thread int a = 42;
1876 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1877 libc_cv_gcc___thread=yes
1879 libc_cv_gcc___thread=no
1882 if test "$libc_cv_gcc___thread" = no; then
1883 AC_MSG_ERROR([support for the __thread keyword is required])
1886 dnl Check whether the compiler supports the tls_model attribute.
1887 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1888 cat > conftest.c <<\EOF
1889 extern __thread int a __attribute__((tls_model ("initial-exec")));
1891 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1892 libc_cv_gcc_tls_model_attr=yes
1894 libc_cv_gcc_tls_model_attr=no
1897 if test "$libc_cv_gcc_tls_model_attr" = no; then
1898 AC_MSG_ERROR([support for the tls_model attribute is required])
1901 dnl Determine how to disable generation of FMA instructions.
1902 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1903 libc_cv_cc_nofma, [dnl
1905 for opt in -ffp-contract=off -mno-fused-madd; do
1906 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1908 AC_SUBST(libc_cv_cc_nofma)
1910 if test -n "$submachine"; then
1911 AC_CACHE_CHECK([for compiler option for CPU variant],
1912 libc_cv_cc_submachine, [dnl
1913 libc_cv_cc_submachine=no
1914 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1915 LIBC_TRY_CC_OPTION([$opt], [
1916 libc_cv_cc_submachine="$opt"
1919 if test "x$libc_cv_cc_submachine" = xno; then
1920 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1923 AC_SUBST(libc_cv_cc_submachine)
1925 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1926 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1927 cat > conftest.c <<EOF
1929 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1932 libc_cv_cc_loop_to_function=no
1933 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1935 libc_cv_cc_loop_to_function=yes
1938 if test $libc_cv_cc_loop_to_function = yes; then
1939 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1941 AC_SUBST(libc_cv_cc_loop_to_function)
1943 dnl Check whether we have the gd library available.
1944 AC_MSG_CHECKING(for libgd)
1945 if test "$with_gd" != "no"; then
1946 old_CFLAGS="$CFLAGS"
1947 CFLAGS="$CFLAGS $libgd_include"
1948 old_LDFLAGS="$LDFLAGS"
1949 LDFLAGS="$LDFLAGS $libgd_ldflags"
1951 LIBS="$LIBS -lgd -lpng -lz -lm"
1952 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1953 CFLAGS="$old_CFLAGS"
1954 LDFLAGS="$old_LDFLAGS"
1959 AC_MSG_RESULT($LIBGD)
1963 if test x$with_selinux = xno ; then
1966 # See if we have the SELinux library
1967 AC_CHECK_LIB(selinux, is_selinux_enabled,
1968 have_selinux=yes, have_selinux=no)
1969 # See if we have the SELinux header with the NSCD permissions in it.
1970 if test x$have_selinux = xyes ; then
1971 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1972 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1973 [#ifdef NSCD__SHMEMHOST
1976 #error NSCD__SHMEMHOST not defined
1978 have_selinux=yes, have_selinux=no)
1979 AC_MSG_RESULT($have_selinux)
1982 if test x$with_selinux = xyes ; then
1983 if test x$have_selinux = xno ; then
1984 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
1988 # Check if we're building with SELinux support.
1989 if test "x$have_selinux" = xyes; then
1990 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1992 # See if we have the libaudit library
1993 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1994 have_libaudit=yes, have_libaudit=no)
1995 if test "x$have_libaudit" = xyes; then
1996 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1998 AC_SUBST(have_libaudit)
2000 # See if we have the libcap library
2001 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2002 if test "x$have_libcap" = xyes; then
2003 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2005 AC_SUBST(have_libcap)
2007 AC_SUBST(have_selinux)
2009 dnl check for the size of 'long double'.
2010 AC_CHECK_SIZEOF(long double, 0)
2011 sizeof_long_double=$ac_cv_sizeof_long_double
2012 AC_SUBST(sizeof_long_double)
2015 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2016 dnl Since we are building the implementations of the fortified functions here,
2017 dnl having the macro defined interacts very badly.
2018 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2019 [AC_TRY_COMPILE([], [
2020 #ifdef _FORTIFY_SOURCE
2023 [libc_cv_predef_fortify_source=no],
2024 [libc_cv_predef_fortify_source=yes])])
2025 if test $libc_cv_predef_fortify_source = yes; then
2026 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2030 dnl Check for silly hacked compilers inserting -fstack-protector.
2031 dnl This breaks badly for the early startup code we compile, since
2032 dnl the compiled code can refer to a magic machine-dependent location
2033 dnl for the canary value before we have sufficient setup for that to
2034 dnl work. It's also questionable to build all of libc with this flag
2035 dnl even when you're doing that for most applications you build, since
2036 dnl libc's code is so heavily-used and performance-sensitive. If we
2037 dnl ever really want to make that work, it should be enabled explicitly
2038 dnl in the libc build, not inherited from implicit compiler settings.
2039 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2040 libc_cv_predef_stack_protector, [
2041 AC_TRY_COMPILE([extern void foobar (char *);],
2042 [char large_array[2048]; foobar (large_array);], [
2043 libc_undefs=`$NM -u conftest.o |
2044 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2045 2>&AS_MESSAGE_LOG_FD` || {
2046 AC_MSG_ERROR([confusing output from $NM -u])
2048 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2049 # On some architectures, there are architecture-specific undefined
2050 # symbols (resolved by the linker), so filter out unknown symbols.
2051 # This will fail to produce the correct result if the compiler
2052 # defaults to -fstack-protector but this produces an undefined symbol
2053 # other than __stack_chk_fail. However, compilers like that have not
2054 # been encountered in practice.
2055 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2056 case "$libc_undefs" in
2057 foobar) libc_cv_predef_stack_protector=no ;;
2059 foobar') libc_cv_predef_stack_protector=yes ;;
2060 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2062 [AC_MSG_ERROR([test compilation failed])])
2065 if test $libc_cv_predef_stack_protector = yes; then
2066 libc_extra_cflags=-fno-stack-protector
2068 AC_SUBST(libc_extra_cflags)
2070 ### End of automated tests.
2071 ### Now run sysdeps configure fragments.
2073 # They also can set these variables.
2075 ldd_rewrite_script=no
2076 libc_cv_sysconfdir=$sysconfdir
2077 libc_cv_localstatedir=$localstatedir
2078 libc_cv_gcc_unwind_find_fde=no
2081 # Iterate over all the sysdep directories we will use, running their
2082 # configure fragments.
2083 for dir in $sysnames; do
2086 *) dest=$srcdir/$dir ;;
2088 if test -r $dest/configure; then
2089 AC_MSG_RESULT(running configure fragment for $dir)
2094 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2095 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2097 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2099 # A sysdeps configure fragment can reset this if IFUNC is not actually
2100 # usable even though the assembler knows how to generate the symbol type.
2101 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2102 AC_DEFINE(HAVE_IFUNC)
2105 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2106 # configure fragment can override the value to prevent this AC_DEFINE.
2108 if test "x$use_nscd" != xno; then
2109 AC_DEFINE([USE_NSCD])
2111 if test "x$build_nscd" = xdefault; then
2112 build_nscd=$use_nscd
2115 # Test for old glibc 2.0.x headers so that they can be removed properly
2116 # Search only in includedir.
2117 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2118 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2120 old_glibc_headers=yes
2122 old_glibc_headers=no
2124 AC_MSG_RESULT($old_glibc_headers)
2125 if test ${old_glibc_headers} = yes; then
2126 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2127 AC_MSG_WARN(*** be removed.)
2129 AC_SUBST(old_glibc_headers)
2131 AC_SUBST(libc_cv_slibdir)
2132 AC_SUBST(libc_cv_rtlddir)
2133 AC_SUBST(libc_cv_localedir)
2134 AC_SUBST(libc_cv_sysconfdir)
2135 AC_SUBST(libc_cv_localstatedir)
2136 AC_SUBST(libc_cv_rootsbindir)
2137 AC_SUBST(libc_cv_forced_unwind)
2139 if test x$use_ldconfig = xyes; then
2140 AC_DEFINE(USE_LDCONFIG)
2142 AC_SUBST(use_ldconfig)
2143 AC_SUBST(ldd_rewrite_script)
2148 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2149 [libc_cv_pic_default=yes
2150 cat > conftest.c <<EOF
2151 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2152 # error PIC is default.
2155 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2156 libc_cv_pic_default=no
2159 AC_SUBST(libc_cv_pic_default)
2162 AC_SUBST(static_nss)
2166 dnl See sysdeps/mach/configure.ac for this variable.
2167 AC_SUBST(mach_interface_list)
2169 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2170 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2174 AC_CONFIG_FILES([config.make Makefile])
2175 AC_CONFIG_COMMANDS([default],[[
2176 case $CONFIG_FILES in *config.make*)
2177 echo "$config_vars" >> config.make;;
2179 test -d bits || mkdir bits]],[[config_vars='$config_vars']])