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="$aux_missing autoconf"
1035 test -n "$critic_missing" && AC_MSG_ERROR([
1036 *** These critical programs are missing or too old:$critic_missing
1037 *** Check the INSTALL file for required versions.])
1039 test -n "$aux_missing" && AC_MSG_WARN([
1040 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1041 *** some features will be disabled.
1042 *** Check the INSTALL file for required versions.])
1044 # if using special system headers, find out the compiler's sekrit
1045 # header directory and add that to the list. NOTE: Only does the right
1046 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1047 if test -n "$sysheaders"; then
1048 SYSINCLUDES=-nostdinc
1049 for d in include include-fixed; do
1050 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1051 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1053 SYSINCLUDES="$SYSINCLUDES \
1054 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1055 if test -n "$CXX"; then
1057 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1058 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1059 test "x$cxxheaders" != x &&
1060 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1064 AC_SUBST(SYSINCLUDES)
1065 AC_SUBST(CXX_SYSINCLUDES)
1067 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1068 # since this would lead to problems installing/building glibc.
1069 # LD_LIBRARY_PATH contains the current directory if one of the following
1071 # - one of the terminals (":" and ";") is the first or last sign
1072 # - two terminals occur directly after each other
1073 # - the path contains an element with a dot in it
1074 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1076 case ${LD_LIBRARY_PATH} in
1077 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1078 ld_library_path_setting="contains current directory"
1081 ld_library_path_setting="ok"
1085 AC_MSG_RESULT($ld_library_path_setting)
1086 if test "$ld_library_path_setting" != "ok"; then
1088 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1089 *** building glibc. Please change the environment variable
1090 *** and run configure again.])
1093 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1094 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1095 libc_cv_gcc_static_libgcc=
1097 libc_cv_gcc_static_libgcc=-static-libgcc
1099 AC_SUBST(libc_cv_gcc_static_libgcc)
1101 AC_PATH_PROG(BASH_SHELL, bash, no)
1102 if test "$BASH_SHELL" != no &&
1103 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1104 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1105 libc_cv_have_bash2=yes
1107 libc_cv_have_bash2=no
1109 AC_SUBST(libc_cv_have_bash2)
1111 AC_PATH_PROG(PERL, perl, no)
1112 if test "$PERL" != no &&
1113 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1116 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1117 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1118 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1120 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1122 [#define __need_size_t
1123 #define __need_wchar_t
1126 #include <stddef.h>], [size_t size; wchar_t wchar;
1128 #error stddef.h ignored __need_*
1130 if (&size == NULL || &wchar == NULL) abort ();],
1131 libc_cv_friendly_stddef=yes,
1132 libc_cv_friendly_stddef=no)])
1133 if test $libc_cv_friendly_stddef = yes; then
1134 config_vars="$config_vars
1135 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1138 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1139 libc_cv_need_minus_P, [dnl
1140 cat > conftest.S <<EOF
1141 #include "confdefs.h"
1142 /* Nothing whatsoever. */
1144 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1145 libc_cv_need_minus_P=no
1147 libc_cv_need_minus_P=yes
1150 if test $libc_cv_need_minus_P = yes; then
1151 config_vars="$config_vars
1152 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1155 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1156 cat > conftest.s <<EOF
1159 .set glibc_conftest_frobozz,foo
1160 .globl glibc_conftest_frobozz
1162 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1163 # (but it doesn't work), so we must do a linking check to be sure.
1164 cat > conftest1.c <<\EOF
1165 extern int glibc_conftest_frobozz;
1166 void _start() { glibc_conftest_frobozz = 1; }
1168 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1169 -nostartfiles -nostdlib \
1170 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1171 libc_cv_asm_set_directive=yes
1173 libc_cv_asm_set_directive=no
1176 if test $libc_cv_asm_set_directive = yes; then
1177 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1180 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1181 libc_cv_asm_unique_object, [dnl
1182 cat > conftest.s <<EOF
1185 .type _sym, %gnu_unique_object
1187 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1188 libc_cv_asm_unique_object=yes
1190 libc_cv_asm_unique_object=no
1193 if test $libc_cv_asm_unique_object = yes; then
1194 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1197 AC_CACHE_CHECK(for .previous assembler directive,
1198 libc_cv_asm_previous_directive, [dnl
1199 cat > conftest.s <<EOF
1200 .section foo_section
1203 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1204 libc_cv_asm_previous_directive=yes
1206 libc_cv_asm_previous_directive=no
1209 if test $libc_cv_asm_previous_directive = yes; then
1210 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1212 AC_CACHE_CHECK(for .popsection assembler directive,
1213 libc_cv_asm_popsection_directive, [dnl
1214 cat > conftest.s <<EOF
1215 .pushsection foo_section
1218 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1219 libc_cv_asm_popsection_directive=yes
1221 libc_cv_asm_popsection_directive=no
1224 if test $libc_cv_asm_popsection_directive = yes; then
1225 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1228 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1229 libc_cv_asm_protected_directive, [dnl
1230 cat > conftest.s <<EOF
1236 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1237 libc_cv_asm_protected_directive=yes
1239 AC_MSG_ERROR(assembler support for symbol visibility is required)
1243 if test $libc_cv_asm_protected_directive = yes; then
1244 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1245 libc_cv_visibility_attribute,
1246 [cat > conftest.c <<EOF
1247 int foo __attribute__ ((visibility ("hidden"))) = 1;
1248 int bar __attribute__ ((visibility ("protected"))) = 1;
1250 libc_cv_visibility_attribute=no
1251 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1252 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1253 if grep '\.protected.*bar' conftest.s >/dev/null; then
1254 libc_cv_visibility_attribute=yes
1258 rm -f conftest.{c,s}
1260 if test $libc_cv_visibility_attribute != yes; then
1261 AC_MSG_ERROR(compiler support for visibility attribute is required)
1265 if test $libc_cv_visibility_attribute = yes; then
1266 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1267 libc_cv_broken_visibility_attribute,
1268 [cat > conftest.c <<EOF
1270 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1271 int bar (int x) { return x; }
1273 libc_cv_broken_visibility_attribute=yes
1274 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1276 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1278 libc_cv_broken_visibility_attribute=no
1281 rm -f conftest.c conftest.s
1283 if test $libc_cv_broken_visibility_attribute = yes; then
1284 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1288 AC_CACHE_CHECK(for broken __attribute__((alias())),
1289 libc_cv_broken_alias_attribute,
1290 [cat > conftest.c <<EOF
1291 extern int foo (int x) __asm ("xyzzy");
1292 int bar (int x) { return x; }
1293 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1295 extern __typeof (dfoo) dfoo __asm ("abccb");
1298 libc_cv_broken_alias_attribute=yes
1299 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1300 if grep 'xyzzy' conftest.s >/dev/null &&
1301 grep 'abccb' conftest.s >/dev/null; then
1302 libc_cv_broken_alias_attribute=no
1305 rm -f conftest.c conftest.s
1307 if test $libc_cv_broken_alias_attribute = yes; then
1308 AC_MSG_ERROR(working alias attribute support required)
1311 if test $libc_cv_visibility_attribute = yes; then
1312 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1313 libc_cv_have_sdata_section,
1314 [echo "int i;" > conftest.c
1315 libc_cv_have_sdata_section=no
1316 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1317 | grep '\.sdata' >/dev/null; then
1318 libc_cv_have_sdata_section=yes
1320 rm -f conftest.c conftest.so
1322 if test $libc_cv_have_sdata_section = yes; then
1323 AC_DEFINE(HAVE_SDATA_SECTION)
1327 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1328 libc_cv_initfini_array, [dnl
1329 LIBC_TRY_LINK_STATIC([
1330 int foo (void) { return 1; }
1331 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1333 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1334 libc_cv_initfini_array=yes
1336 libc_cv_initfini_array=no
1338 [libc_cv_initfini_array=no])
1340 if test $libc_cv_initfini_array != yes; then
1341 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1344 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1345 libc_cv_ctors_header, [dnl
1346 libc_cv_ctors_header=yes
1347 LIBC_TRY_LINK_STATIC([
1348 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1349 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1352 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1353 { gsub(/\@<:@ */, "@<:@") }
1354 $2 == ".ctors" || $2 == ".dtors" {
1355 size = strtonum("0x" $6)
1356 align = strtonum("0x" $NF)
1358 stub@<:@$2@:>@ = size == align * 2
1361 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1362 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1363 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1365 '], [libc_cv_ctors_header=no])
1367 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1370 if test $libc_cv_ctors_header = no; then
1371 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1374 AC_CACHE_CHECK(for libunwind-support in compiler,
1375 libc_cv_cc_with_libunwind, [
1376 cat > conftest.c <<EOF
1377 int main (void) { return 0; }
1379 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1380 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1381 libc_cv_cc_with_libunwind=yes
1383 libc_cv_cc_with_libunwind=no
1386 AC_SUBST(libc_cv_cc_with_libunwind)
1387 if test $libc_cv_cc_with_libunwind = yes; then
1388 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1391 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1392 [libc_cv_z_nodelete=yes],
1393 [AC_MSG_ERROR(linker with -z nodelete support required)])
1395 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1396 [libc_cv_z_nodlopen=yes],
1397 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1399 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1400 [libc_cv_z_initfirst=yes],
1401 [AC_MSG_ERROR(linker with -z initfirst support required)])
1403 # Add-on fragments can set these for other machines.
1404 libc_commonpagesize=${libc_commonpagesize:-no}
1405 libc_relro_required=${libc_relro_required:-no}
1406 case "$base_machine" in
1407 i[[34567]]86 | x86_64 | powerpc* | s390*)
1408 libc_commonpagesize=0x1000
1409 libc_relro_required=yes
1412 libc_commonpagesize=0x2000
1413 libc_relro_required=yes
1417 if test $libc_commonpagesize != no; then
1418 AC_CACHE_CHECK(for -z relro option,
1419 libc_cv_z_relro, [dnl
1421 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1422 int _start (void) { return 42; }
1423 extern void _exit (int);
1424 /* Since these pointers are const, they should go in rodata.
1425 Since they refer to functions that have to be resolved by
1426 dynamic linking, they should instead go in RELRO data. */
1427 const void *const relro[] = { &_start, &_exit, 0 };
1428 /* GNU ld fails to produce RELRO data when it's very small and there is no
1429 normal writable data following it, or if only uninitialized (.bss) data
1430 follows it, or only very small writable data. */
1431 int data[0x10000] = { 1, };
1433 cat > conftest.awk <<\EOF
1436 commonpagesize = strtonum(commonpagesize)
1438 { print "LINE:", $0 > "/dev/stderr" }
1440 vaddr = strtonum($3)
1441 memsz = strtonum($6)
1443 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1444 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1445 result = (end % commonpagesize == 0) ? "yes" : "broken"
1447 END { print result }
1449 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1450 -fPIC -shared -o conftest.so conftest.c
1451 -nostartfiles -nostdlib
1452 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1453 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1455 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1456 conftest.ph > conftest.cps
1458 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1460 if { test "x$libc_relro_required" = xyes &&
1461 test "x$libc_cv_z_relro" != xyes
1464 AC_MSG_ERROR(linker with -z relro support required)
1467 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1470 AC_CACHE_CHECK(for -Bgroup option,
1471 libc_cv_Bgroup, [dnl
1472 cat > conftest.c <<EOF
1473 int _start (void) { return 42; }
1475 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1476 -fPIC -shared -o conftest.so conftest.c
1477 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1484 AC_SUBST(libc_cv_Bgroup)
1487 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1488 libc_cv_as_noexecstack, [dnl
1489 cat > conftest.c <<EOF
1492 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1493 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1494 && grep .note.GNU-stack conftest.s >/dev/null \
1495 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1496 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1498 libc_cv_as_noexecstack=yes
1500 libc_cv_as_noexecstack=no
1503 if test $libc_cv_as_noexecstack = yes; then
1504 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1506 AC_SUBST(ASFLAGS_config)
1508 AC_CACHE_CHECK(for -z combreloc,
1509 libc_cv_z_combreloc, [dnl
1510 cat > conftest.c <<EOF
1511 extern int bar (int);
1513 int foo (void) { return bar (mumble); }
1515 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1516 -fPIC -shared -o conftest.so conftest.c
1517 -nostdlib -nostartfiles
1518 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1520 dnl The following test is a bit weak. We must use a tool which can test
1521 dnl cross-platform since the gcc used can be a cross compiler. Without
1522 dnl introducing new options this is not easily doable. Instead use a tool
1523 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1524 dnl look for a section named .rel.dyn.
1525 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1526 libc_cv_z_combreloc=yes
1528 libc_cv_z_combreloc=no
1531 libc_cv_z_combreloc=no
1534 if test "$libc_cv_z_combreloc" = yes; then
1535 AC_DEFINE(HAVE_Z_COMBRELOC)
1537 AC_SUBST(libc_cv_z_combreloc)
1539 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1540 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1541 AC_SUBST(libc_cv_z_execstack)
1543 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1544 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1547 AC_SUBST(libc_cv_fpie)
1549 AC_CACHE_CHECK(for --hash-style option,
1550 libc_cv_hashstyle, [dnl
1551 cat > conftest.c <<EOF
1552 int _start (void) { return 42; }
1554 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1555 -fPIC -shared -o conftest.so conftest.c
1556 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1558 libc_cv_hashstyle=yes
1560 libc_cv_hashstyle=no
1563 AC_SUBST(libc_cv_hashstyle)
1565 # The linker's default -shared behavior is good enough if it
1566 # does these things that our custom linker scripts ensure that
1567 # all allocated NOTE sections come first.
1568 if test "$use_default_link" = default; then
1569 AC_CACHE_CHECK([for sufficient default -shared layout],
1570 libc_cv_use_default_link, [dnl
1571 libc_cv_use_default_link=no
1572 cat > conftest.s <<\EOF
1573 .section .note.a,"a",%note
1578 .section .note.b,"a",%note
1584 if AC_TRY_COMMAND([dnl
1585 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1586 ac_try=`$READELF -S conftest.so | sed -n \
1588 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1594 libc_seen_a=no libc_seen_b=no
1596 while test $# -ge 2 -a "$1" = NOTE; do
1598 .note.a) libc_seen_a=yes ;;
1599 .note.b) libc_seen_b=yes ;;
1603 case "$libc_seen_a$libc_seen_b" in
1605 libc_cv_use_default_link=yes
1608 echo >&AS_MESSAGE_LOG_FD "\
1609 $libc_seen_a$libc_seen_b from:
1615 use_default_link=$libc_cv_use_default_link
1618 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1619 if libc_cv_output_format=`
1620 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1624 libc_cv_output_format=
1626 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1627 AC_SUBST(libc_cv_output_format)
1629 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1630 cat > conftest.c <<EOF
1633 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1634 conftest.c 1>&AS_MESSAGE_LOG_FD])
1636 libc_cv_fno_toplevel_reorder=yes
1638 libc_cv_fno_toplevel_reorder=no
1641 if test $libc_cv_fno_toplevel_reorder = yes; then
1642 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1644 fno_unit_at_a_time=-fno-unit-at-a-time
1646 AC_SUBST(fno_unit_at_a_time)
1648 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1649 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1653 AC_SUBST(libc_cv_ssp)
1655 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1656 cat > conftest.c <<EOF
1658 #ifdef __GNUC_GNU_INLINE__
1659 main () { return 0;}
1664 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1665 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1667 libc_cv_gnu89_inline=yes
1669 libc_cv_gnu89_inline=no
1672 if test $libc_cv_gnu89_inline = yes; then
1673 gnu89_inline=-fgnu89-inline
1677 AC_SUBST(gnu89_inline)
1679 AC_CACHE_CHECK(whether cc puts quotes around section names,
1680 libc_cv_have_section_quotes,
1681 [cat > conftest.c <<EOF
1682 static const int foo
1683 __attribute__ ((section ("bar"))) = 1;
1685 if ${CC-cc} -S conftest.c -o conftest.s; then
1686 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1687 libc_cv_have_section_quotes=yes
1689 libc_cv_have_section_quotes=no
1692 libc_cv_have_section_quotes=unknown
1694 rm -f conftest.{c,s}
1696 if test $libc_cv_have_section_quotes = yes; then
1697 AC_DEFINE(HAVE_SECTION_QUOTES)
1700 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1702 cat > conftest.s <<EOF
1707 .weak bar; bar = foo
1709 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1710 libc_cv_asm_weak_directive=yes
1712 libc_cv_asm_weak_directive=no
1716 if test $libc_cv_asm_weak_directive = no; then
1717 AC_CACHE_CHECK(for assembler .weakext directive,
1718 libc_cv_asm_weakext_directive,
1720 cat > conftest.s <<EOF
1729 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1730 libc_cv_asm_weakext_directive=yes
1732 libc_cv_asm_weakext_directive=no
1738 if test $libc_cv_asm_weak_directive = yes; then
1739 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1740 elif test $libc_cv_asm_weakext_directive = yes; then
1741 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1744 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1746 sparc/sparc64*) cfi_offset=2047;;
1749 cat > conftest.s <<EOF
1751 .type func,%function
1755 .cfi_rel_offset 1, $cfi_offset
1758 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1759 libc_cv_asm_cfi_directives=yes
1761 libc_cv_asm_cfi_directives=no
1764 if test $libc_cv_asm_cfi_directives = yes; then
1765 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1768 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1769 cat > conftest.c <<\EOF
1774 dnl No \ in command here because it ends up inside ''.
1775 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1776 -nostdlib -nostartfiles -Wl,--no-whole-archive
1777 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1778 libc_cv_ld_no_whole_archive=yes
1780 libc_cv_ld_no_whole_archive=no
1783 if test $libc_cv_ld_no_whole_archive = no; then
1784 AC_MSG_ERROR([support for --no-whole-archive is needed])
1787 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1788 cat > conftest.c <<\EOF
1793 dnl No \ in command here because it ends up inside ''.
1794 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1795 -nostdlib -nostartfiles -fexceptions
1796 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1797 libc_cv_gcc_exceptions=yes
1799 libc_cv_gcc_exceptions=no
1802 if test $libc_cv_gcc_exceptions = yes; then
1803 exceptions=-fexceptions
1805 AC_SUBST(exceptions)dnl
1807 if test "$host_cpu" = powerpc ; then
1808 # Check for a bug present in at least versions 2.8.x of GCC
1809 # and versions 1.0.x of EGCS.
1810 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1811 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1812 libc_cv_c_asmcr0_bug='no',
1813 libc_cv_c_asmcr0_bug='yes')])
1814 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1815 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1819 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1820 cat > conftest.c <<\EOF
1823 __builtin_memset (x, 0, 1000);
1827 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1829 libc_cv_gcc_builtin_memset=no
1831 libc_cv_gcc_builtin_memset=yes
1834 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1835 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1838 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1839 cat > conftest.c <<\EOF
1840 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1841 char *foo (const char *a, const char *b)
1843 return __builtin_strstr (a, b);
1847 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1849 libc_cv_gcc_builtin_redirection=yes
1851 libc_cv_gcc_builtin_redirection=no
1854 if test "$libc_cv_gcc_builtin_redirection" = no; then
1855 AC_MSG_ERROR([support for the symbol redirection needed])
1858 dnl Check whether the compiler supports the __thread keyword.
1859 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1860 [cat > conftest.c <<\EOF
1861 __thread int a = 42;
1863 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1864 libc_cv_gcc___thread=yes
1866 libc_cv_gcc___thread=no
1869 if test "$libc_cv_gcc___thread" = no; then
1870 AC_MSG_ERROR([support for the __thread keyword is required])
1873 dnl Check whether the compiler supports the tls_model attribute.
1874 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1875 cat > conftest.c <<\EOF
1876 extern __thread int a __attribute__((tls_model ("initial-exec")));
1878 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1879 libc_cv_gcc_tls_model_attr=yes
1881 libc_cv_gcc_tls_model_attr=no
1884 if test "$libc_cv_gcc_tls_model_attr" = no; then
1885 AC_MSG_ERROR([support for the tls_model attribute is required])
1888 dnl Determine how to disable generation of FMA instructions.
1889 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1890 libc_cv_cc_nofma, [dnl
1892 for opt in -ffp-contract=off -mno-fused-madd; do
1893 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1895 AC_SUBST(libc_cv_cc_nofma)
1897 if test -n "$submachine"; then
1898 AC_CACHE_CHECK([for compiler option for CPU variant],
1899 libc_cv_cc_submachine, [dnl
1900 libc_cv_cc_submachine=no
1901 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1902 LIBC_TRY_CC_OPTION([$opt], [
1903 libc_cv_cc_submachine="$opt"
1906 if test "x$libc_cv_cc_submachine" = xno; then
1907 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1910 AC_SUBST(libc_cv_cc_submachine)
1912 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1913 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1914 cat > conftest.c <<EOF
1916 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1919 libc_cv_cc_loop_to_function=no
1920 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1922 libc_cv_cc_loop_to_function=yes
1925 if test $libc_cv_cc_loop_to_function = yes; then
1926 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1928 AC_SUBST(libc_cv_cc_loop_to_function)
1930 dnl Check whether we have the gd library available.
1931 AC_MSG_CHECKING(for libgd)
1932 if test "$with_gd" != "no"; then
1933 old_CFLAGS="$CFLAGS"
1934 CFLAGS="$CFLAGS $libgd_include"
1935 old_LDFLAGS="$LDFLAGS"
1936 LDFLAGS="$LDFLAGS $libgd_ldflags"
1938 LIBS="$LIBS -lgd -lpng -lz -lm"
1939 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1940 CFLAGS="$old_CFLAGS"
1941 LDFLAGS="$old_LDFLAGS"
1946 AC_MSG_RESULT($LIBGD)
1950 if test x$with_selinux = xno ; then
1953 # See if we have the SELinux library
1954 AC_CHECK_LIB(selinux, is_selinux_enabled,
1955 have_selinux=yes, have_selinux=no)
1956 # See if we have the SELinux header with the NSCD permissions in it.
1957 if test x$have_selinux = xyes ; then
1958 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1959 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1960 [#ifdef NSCD__SHMEMHOST
1963 #error NSCD__SHMEMHOST not defined
1965 have_selinux=yes, have_selinux=no)
1966 AC_MSG_RESULT($have_selinux)
1969 if test x$with_selinux = xyes ; then
1970 if test x$have_selinux = xno ; then
1971 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
1975 # Check if we're building with SELinux support.
1976 if test "x$have_selinux" = xyes; then
1977 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1979 # See if we have the libaudit library
1980 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1981 have_libaudit=yes, have_libaudit=no)
1982 if test "x$have_libaudit" = xyes; then
1983 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1985 AC_SUBST(have_libaudit)
1987 # See if we have the libcap library
1988 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1989 if test "x$have_libcap" = xyes; then
1990 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1992 AC_SUBST(have_libcap)
1994 AC_SUBST(have_selinux)
1996 dnl check for the size of 'long double'.
1997 AC_CHECK_SIZEOF(long double, 0)
1998 sizeof_long_double=$ac_cv_sizeof_long_double
1999 AC_SUBST(sizeof_long_double)
2002 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2003 dnl Since we are building the implementations of the fortified functions here,
2004 dnl having the macro defined interacts very badly.
2005 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2006 [AC_TRY_COMPILE([], [
2007 #ifdef _FORTIFY_SOURCE
2010 [libc_cv_predef_fortify_source=no],
2011 [libc_cv_predef_fortify_source=yes])])
2012 if test $libc_cv_predef_fortify_source = yes; then
2013 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2017 dnl Check for silly hacked compilers inserting -fstack-protector.
2018 dnl This breaks badly for the early startup code we compile, since
2019 dnl the compiled code can refer to a magic machine-dependent location
2020 dnl for the canary value before we have sufficient setup for that to
2021 dnl work. It's also questionable to build all of libc with this flag
2022 dnl even when you're doing that for most applications you build, since
2023 dnl libc's code is so heavily-used and performance-sensitive. If we
2024 dnl ever really want to make that work, it should be enabled explicitly
2025 dnl in the libc build, not inherited from implicit compiler settings.
2026 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2027 libc_cv_predef_stack_protector, [
2028 AC_TRY_COMPILE([extern void foobar (char *);],
2029 [char large_array[2048]; foobar (large_array);], [
2030 libc_undefs=`$NM -u conftest.o |
2031 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2032 2>&AS_MESSAGE_LOG_FD` || {
2033 AC_MSG_ERROR([confusing output from $NM -u])
2035 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2036 # On some architectures, there are architecture-specific undefined
2037 # symbols (resolved by the linker), so filter out unknown symbols.
2038 # This will fail to produce the correct result if the compiler
2039 # defaults to -fstack-protector but this produces an undefined symbol
2040 # other than __stack_chk_fail. However, compilers like that have not
2041 # been encountered in practice.
2042 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2043 case "$libc_undefs" in
2044 foobar) libc_cv_predef_stack_protector=no ;;
2046 foobar') libc_cv_predef_stack_protector=yes ;;
2047 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2049 [AC_MSG_ERROR([test compilation failed])])
2052 if test $libc_cv_predef_stack_protector = yes; then
2053 libc_extra_cflags=-fno-stack-protector
2055 AC_SUBST(libc_extra_cflags)
2057 AC_CACHE_CHECK([whether the linker provides __ehdr_start],
2058 libc_cv_ehdr_start, [
2059 old_CFLAGS="$CFLAGS"
2060 old_LDFLAGS="$LDFLAGS"
2062 CFLAGS="$CFLAGS -fPIC"
2063 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
2065 AC_LINK_IFELSE([AC_LANG_SOURCE([
2066 extern const char __ehdr_start __attribute__ ((visibility ("hidden")));
2067 const char *ehdr (void) { return &__ehdr_start; }
2069 [libc_cv_ehdr_start=yes], [libc_cv_ehdr_start=no])
2070 CFLAGS="$old_CFLAGS"
2071 LDFLAGS="$old_LDFLAGS"
2074 if test $libc_cv_ehdr_start = yes; then
2075 AC_DEFINE([HAVE_EHDR_START])
2078 ### End of automated tests.
2079 ### Now run sysdeps configure fragments.
2081 # They also can set these variables.
2083 ldd_rewrite_script=no
2084 libc_cv_sysconfdir=$sysconfdir
2085 libc_cv_localstatedir=$localstatedir
2086 libc_cv_gcc_unwind_find_fde=no
2089 # Iterate over all the sysdep directories we will use, running their
2090 # configure fragments.
2091 for dir in $sysnames; do
2094 *) dest=$srcdir/$dir ;;
2096 if test -r $dest/configure; then
2097 AC_MSG_RESULT(running configure fragment for $dir)
2102 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2103 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2105 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2107 # A sysdeps configure fragment can reset this if IFUNC is not actually
2108 # usable even though the assembler knows how to generate the symbol type.
2109 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2110 AC_DEFINE(HAVE_IFUNC)
2113 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2114 # configure fragment can override the value to prevent this AC_DEFINE.
2116 if test "x$use_nscd" != xno; then
2117 AC_DEFINE([USE_NSCD])
2119 if test "x$build_nscd" = xdefault; then
2120 build_nscd=$use_nscd
2123 # Test for old glibc 2.0.x headers so that they can be removed properly
2124 # Search only in includedir.
2125 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2126 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2128 old_glibc_headers=yes
2130 old_glibc_headers=no
2132 AC_MSG_RESULT($old_glibc_headers)
2133 if test ${old_glibc_headers} = yes; then
2134 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2135 AC_MSG_WARN(*** be removed.)
2137 AC_SUBST(old_glibc_headers)
2139 AC_SUBST(libc_cv_slibdir)
2140 AC_SUBST(libc_cv_rtlddir)
2141 AC_SUBST(libc_cv_localedir)
2142 AC_SUBST(libc_cv_sysconfdir)
2143 AC_SUBST(libc_cv_localstatedir)
2144 AC_SUBST(libc_cv_rootsbindir)
2145 AC_SUBST(libc_cv_forced_unwind)
2147 if test x$use_ldconfig = xyes; then
2148 AC_DEFINE(USE_LDCONFIG)
2150 AC_SUBST(use_ldconfig)
2151 AC_SUBST(ldd_rewrite_script)
2156 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2157 [libc_cv_pic_default=yes
2158 cat > conftest.c <<EOF
2159 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2160 # error PIC is default.
2163 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2164 libc_cv_pic_default=no
2167 AC_SUBST(libc_cv_pic_default)
2170 AC_SUBST(static_nss)
2174 dnl See sysdeps/mach/configure.ac for this variable.
2175 AC_SUBST(mach_interface_list)
2177 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2178 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2182 AC_CONFIG_FILES([config.make Makefile])
2183 AC_CONFIG_COMMANDS([default],[[
2184 case $CONFIG_FILES in *config.make*)
2185 echo "$config_vars" >> config.make;;
2187 test -d bits || mkdir bits]],[[config_vars='$config_vars']])