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 dnl This is here so we can set $subdirs directly based on configure fragments.
26 if test $host != $build; then
27 AC_CHECK_PROGS(BUILD_CC, gcc cc)
29 AC_SUBST(cross_compiling)
31 # We need the C++ compiler only for testing.
33 AC_CHECK_TOOL(READELF, readelf, false)
35 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
36 AC_MSG_ERROR([you must configure in a separate build directory])
39 # This will get text that should go into config.make.
42 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
44 AC_HELP_STRING([--with-gd=DIR],
45 [find libgd include dir and library with prefix DIR]),
49 *) libgd_include="-I$withval/include"
50 libgd_ldflags="-L$withval/lib" ;;
53 AC_ARG_WITH([gd-include],
54 AC_HELP_STRING([--with-gd-include=DIR],
55 [find libgd include files in DIR]),
57 case "$with_gd_include" in
59 *) libgd_include="-I$withval" ;;
63 AC_HELP_STRING([--with-gd-lib=DIR],
64 [find libgd library files in DIR]),
66 case "$with_gd_lib" in
68 *) libgd_ldflags="-L$withval" ;;
72 if test -n "$libgd_include"; then
73 config_vars="$config_vars
74 CFLAGS-memusagestat.c = $libgd_include"
76 if test -n "$libgd_ldflags"; then
77 config_vars="$config_vars
78 libgd-LDFLAGS = $libgd_ldflags"
81 dnl Arguments to specify presence of other packages/features.
83 AC_HELP_STRING([--with-fp],
84 [if using floating-point hardware @<:@default=yes@:>@]),
88 AC_ARG_WITH([binutils],
89 AC_HELP_STRING([--with-binutils=PATH],
90 [specify location of binutils (as and ld)]),
91 [path_binutils=$withval],
93 AC_ARG_WITH([selinux],
94 AC_HELP_STRING([--with-selinux],
95 [if building with SELinux support]),
96 [with_selinux=$withval],
99 AC_ARG_WITH([headers],
100 AC_HELP_STRING([--with-headers=PATH],
101 [location of system headers to use
102 (for example /usr/src/linux/include)
103 @<:@default=compiler default@:>@]),
104 [sysheaders=$withval],
108 AC_SUBST(use_default_link)
109 AC_ARG_WITH([default-link],
110 AC_HELP_STRING([--with-default-link],
111 [do not use explicit linker scripts]),
112 [use_default_link=$withval],
113 [use_default_link=default])
115 AC_ARG_ENABLE([sanity-checks],
116 AC_HELP_STRING([--disable-sanity-checks],
117 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
118 [enable_sanity=$enableval],
121 AC_ARG_ENABLE([shared],
122 AC_HELP_STRING([--enable-shared],
123 [build shared library @<:@default=yes if GNU ld@:>@]),
126 AC_ARG_ENABLE([profile],
127 AC_HELP_STRING([--enable-profile],
128 [build profiled library @<:@default=no@:>@]),
129 [profile=$enableval],
131 AC_ARG_ENABLE([versioning],
132 AC_HELP_STRING([--disable-versioning],
133 [do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
134 [enable_versioning=$enableval],
135 [enable_versioning=yes])
137 AC_ARG_ENABLE([oldest-abi],
138 AC_HELP_STRING([--enable-oldest-abi=ABI],
139 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
140 [oldest_abi=$enableval],
142 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
145 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
149 AC_ARG_ENABLE([stackguard-randomization],
150 AC_HELP_STRING([--enable-stackguard-randomization],
151 [initialize __stack_chk_guard canary with a random number at program start]),
152 [enable_stackguard_randomize=$enableval],
153 [enable_stackguard_randomize=no])
154 if test "$enable_stackguard_randomize" = yes; then
155 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
158 dnl Generic infrastructure for drop-in additions to libc.
159 AC_ARG_ENABLE([add-ons],
160 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
161 [configure and build add-ons in DIR1,DIR2,...
162 search for add-ons if no parameter given]),
163 , [enable_add_ons=yes])
165 AC_ARG_ENABLE([hidden-plt],
166 AC_HELP_STRING([--disable-hidden-plt],
167 [do not hide internal function calls to avoid PLT]),
170 if test "x$hidden" = xno; then
174 AC_ARG_ENABLE([bind-now],
175 AC_HELP_STRING([--enable-bind-now],
176 [disable lazy relocations in DSOs]),
177 [bindnow=$enableval],
181 dnl On some platforms we cannot use dynamic loading. We must provide
182 dnl static NSS modules.
183 AC_ARG_ENABLE([static-nss],
184 AC_HELP_STRING([--enable-static-nss],
185 [build static NSS modules @<:@default=no@:>@]),
186 [static_nss=$enableval],
188 dnl Enable static NSS also if we build no shared objects.
189 if test x"$static_nss" = xyes || test x"$shared" = xno; then
191 AC_DEFINE(DO_STATIC_NSS)
194 AC_ARG_ENABLE([force-install],
195 AC_HELP_STRING([--disable-force-install],
196 [don't force installation of files from this package, even if they are older than the installed files]),
197 [force_install=$enableval],
199 AC_SUBST(force_install)
201 dnl On some platforms we allow dropping compatibility with all kernel
203 AC_ARG_ENABLE([kernel],
204 AC_HELP_STRING([--enable-kernel=VERSION],
205 [compile for compatibility with kernel not older than VERSION]),
206 [minimum_kernel=$enableval],
208 dnl Prevent unreasonable values.
209 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
210 # Better nothing than this.
213 if test "$minimum_kernel" = current; then
214 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
218 dnl For the development we sometimes want gcc to issue even more warnings.
219 dnl This is not the default since many of the extra warnings are not
221 AC_ARG_ENABLE([all-warnings],
222 AC_HELP_STRING([--enable-all-warnings],
223 [enable all useful warnings gcc can issue]),
224 [all_warnings=$enableval],
226 AC_SUBST(all_warnings)
228 AC_ARG_ENABLE([multi-arch],
229 AC_HELP_STRING([--enable-multi-arch],
230 [enable single DSO with optimizations for multiple architectures]),
231 [multi_arch=$enableval],
232 [multi_arch=default])
234 AC_ARG_ENABLE([nss-crypt],
235 AC_HELP_STRING([--enable-nss-crypt],
236 [enable libcrypt to use nss]),
237 [nss_crypt=$enableval],
239 if test x$nss_crypt = xyes; then
240 nss_includes=-I$(nss-config --includedir 2>/dev/null)
241 if test $? -ne 0; then
242 AC_MSG_ERROR([cannot find include directory with nss-config])
245 CFLAGS="$CFLAGS $nss_includes"
246 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
248 #include <nsslowhash.h>
249 void f (void) { NSSLOW_Init (); }])],
250 libc_cv_nss_crypt=yes,
252 cannot find NSS headers with lowlevel hash function interfaces]))
254 LIBS="$LIBS -lfreebl3"
255 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
257 #include <nsslowhash.h>],
259 libc_cv_nss_crypt=yes,
261 cannot link program using lowlevel NSS hash functions]))
267 AC_SUBST(libc_cv_nss_crypt)
270 AC_ARG_ENABLE([obsolete-rpc],
271 AC_HELP_STRING([--enable-obsolete-rpc],
272 [build and install the obsolete RPC code for link-time usage]),
273 [link_obsolete_rpc=$enableval],
274 [link_obsolete_rpc=no])
275 AC_SUBST(link_obsolete_rpc)
277 if test "$link_obsolete_rpc" = yes; then
278 AC_DEFINE(LINK_OBSOLETE_RPC)
281 AC_ARG_ENABLE([systemtap],
282 [AS_HELP_STRING([--enable-systemtap],
283 [enable systemtap static probe points @<:@default=no@:>@])],
284 [systemtap=$enableval],
286 if test "x$systemtap" != xno; then
287 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
289 CFLAGS="-std=gnu99 $CFLAGS"
290 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
291 void foo (int i, void *p)
293 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
294 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
295 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
296 CFLAGS="$old_CFLAGS"])
297 if test $libc_cv_sdt = yes; then
298 AC_DEFINE([USE_STAP_PROBE])
299 elif test "x$systemtap" != xauto; then
300 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
304 AC_ARG_ENABLE([build-nscd],
305 [AS_HELP_STRING([--disable-build-nscd],
306 [disable building and installing the nscd daemon])],
307 [build_nscd=$enableval],
308 [build_nscd=default])
311 # Note the use of $use_nscd is near the bottom of the file.
312 AC_ARG_ENABLE([nscd],
313 [AS_HELP_STRING([--disable-nscd],
314 [library functions will not contact the nscd daemon])],
315 [use_nscd=$enableval],
318 # The way shlib-versions is used to generate soversions.mk uses a
319 # fairly simplistic model for name recognition that can't distinguish
320 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
321 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
322 # tell. This doesn't get used much beyond that, so it's fairly safe.
327 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
331 # We keep the original values in `$config_*' and never modify them, so we
332 # can write them unchanged into config.make. Everything else uses
333 # $machine, $vendor, and $os, and changes them whenever convenient.
334 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
336 # Don't allow vendor == "unknown"
337 test "$config_vendor" = unknown && config_vendor=
338 config_os="`echo $config_os | sed 's/^unknown-//'`"
340 # Some configurations imply other options.
343 # The configure fragment of an add-on port can modify these to supplement
344 # or override the table in the case statement below. No fragment should
345 # ever change the config_* variables, however.
346 machine=$config_machine
347 vendor=$config_vendor
351 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
353 if test "$machine" = rs6000; then
357 # Braindead PowerPC box with absolutely no FPU.
358 case "$machine-$host_os" in
366 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
369 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
371 *) submachine="$withval" ;;
375 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
376 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
378 # An add-on can set this when it wants to disable the sanity check below.
381 dnl Having this here, though empty, makes sure that if add-ons' fragments
382 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
383 dnl our AC_OUTPUT will actually use it.
386 case "$enable_add_ons" in
389 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
390 sed 's@/[[^/]]*$@@' | sort | uniq`
391 add_ons_automatic=yes
393 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
394 add_ons_automatic=no ;;
400 if test x"$add_ons" != x; then
401 for f in $add_ons; do
406 *** It seems that you're using an old \`crypt' add-on. crypt is now
407 *** part of glibc and using the old add-on will not work with this
408 *** release. Start again with fresh sources and without the old
409 *** \`crypt' add-on.])
413 *** It seems that you're using an old \`localedata' add-on. localedata
414 *** is now part of glibc and using the old add-on will not work with
415 *** this release. Start again with fresh sources and without the old
416 *** \`localedata' add-on.])
421 # Now source each add-on's configure fragment.
422 # The fragments can use $srcdir/$libc_add_on to find themselves,
423 # and test $add_ons_automatic to see if they were explicitly requested.
424 # A fragment can clear (or even change) $libc_add_on to affect
425 # whether it goes into the list to be actually used in the build.
427 for libc_add_on in $add_ons; do
428 # Test whether such a directory really exists.
429 # It can be absolute, or relative to $srcdir, or relative to the build dir.
430 case "$libc_add_on" in
432 libc_add_on_srcdir=$libc_add_on
435 test -d "$srcdir/$libc_add_on" || {
436 if test -d "$libc_add_on"; then
437 libc_add_on="`pwd`/$libc_add_on"
439 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
442 libc_add_on_srcdir=$srcdir/$libc_add_on
446 libc_add_on_frag=$libc_add_on_srcdir/configure
447 libc_add_on_canonical=
448 libc_add_on_config_subdirs=
449 if test -r "$libc_add_on_frag"; then
450 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
451 libc_add_on_canonical=unknown
453 . "$libc_add_on_frag"
454 test -z "$libc_add_on" || {
455 configured_add_ons="$configured_add_ons $libc_add_on"
456 if test "x$libc_add_on_canonical" = xunknown; then
457 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
459 for d in $libc_add_on_subdirs; do
460 case "$libc_add_on" in
461 /*) subdir_srcdir="$libc_add_on" ;;
462 *) subdir_srcdir="\$(..)$libc_add_on" ;;
466 d="${libc_add_on_canonical:-$libc_add_on}"
472 subdir_srcdir="$subdir_srcdir/$d"
475 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
476 add_on_subdirs="$add_on_subdirs $d"
477 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
478 $d-srcdir = $subdir_srcdir"
480 for d in $libc_add_on_config_subdirs; do
483 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
485 if test ! -d "$libc_add_on_srcdir/$d"; then
486 AC_MSG_ERROR(fragment wants to configure missing directory $d)
488 case "$libc_add_on" in
490 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
492 subdirs="$subdirs $libc_add_on/$d"
496 if test -n "$libc_add_on"; then
497 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
498 use_add_ons="$use_add_ons $libc_add_on"
499 add_ons_pfx="$add_ons_pfx $libc_add_on/"
500 test -z "$libc_add_on_canonical" ||
501 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
504 # Use echo to strip excess whitespace.
505 add_ons="`echo $use_add_ons`"
508 AC_SUBST(add_on_subdirs)
512 ### I put this here to prevent those annoying emails from people who cannot
513 ### read and try to compile glibc on unsupported platforms. --drepper
515 ### By using the undocumented --enable-hacker-mode option for configure
516 ### one can skip this test to make the configuration not fail for unsupported
519 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
520 case "$machine-$host_os" in
524 echo "*** The GNU C library is currently not available for this platform."
525 echo "*** So far nobody cared to port it and if there is no volunteer it"
526 echo "*** might never happen. So, if you have interest to see glibc on"
527 echo "*** this platform visit"
528 echo "*** http://www.gnu.org/software/libc/porting.html"
529 echo "*** and join the group of porters"
535 dnl We need to use [ and ] for other purposes for a while now.
537 # Expand the configuration machine name into a subdirectory by architecture
538 # type and particular chip. If an add-on configure fragment already set
539 # base_machine, we don't change it.
540 test -n "$base_machine" || case "$machine" in
541 i[34567]86) base_machine=i386 machine=i386/$machine ;;
542 powerpc) base_machine=powerpc machine=powerpc/powerpc32 ;;
543 powerpc64) base_machine=powerpc machine=powerpc/powerpc64 ;;
544 s390) base_machine=s390 machine=s390/s390-32 ;;
545 s390x) base_machine=s390 machine=s390/s390-64 ;;
546 sh3*) base_machine=sh machine=sh/sh3 ;;
547 sh4*) base_machine=sh machine=sh/sh4 ;;
549 base_machine=sparc machine=sparc/sparc32 ;;
550 sparcv8 | supersparc | hypersparc)
551 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
552 sparcv8plus | sparcv8plusa | sparcv9)
553 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
554 sparcv8plusb | sparcv9b)
555 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
557 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
559 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
561 base_machine=sparc machine=sparc/sparc64 ;;
563 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
565 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
567 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
568 *) base_machine=$machine ;;
571 AC_SUBST(base_machine)
573 if test "$base_machine" = "i386"; then
574 AC_DEFINE(USE_REGPARMS)
577 # For the multi-arch option we need support in the assembler & linker.
578 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
579 libc_cv_ld_gnu_indirect_function, [dnl
580 cat > conftest.S <<EOF
581 .type foo,%gnu_indirect_function
594 libc_cv_ld_gnu_indirect_function=no
595 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
596 -nostartfiles -nostdlib \
597 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
598 # Do a link to see if the backend supports IFUNC relocs.
599 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
600 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
601 libc_cv_ld_gnu_indirect_function=yes
606 AC_MSG_CHECKING(whether .text pseudo-op must be used)
607 AC_CACHE_VAL(libc_cv_dot_text, [dnl
608 cat > conftest.s <<EOF
612 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
613 libc_cv_dot_text=.text
616 if test -z "$libc_cv_dot_text"; then
622 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
623 if test x"$multi_arch" = xyes; then
624 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
629 if test x"$multi_arch" != xno; then
630 multi_arch_d=/multiarch
633 # Compute the list of sysdep directories for this configuration.
634 # This can take a while to compute.
635 sysdep_dir=$srcdir/sysdeps
636 AC_MSG_CHECKING(sysdep dirs)
637 dnl We need to use [ and ] for other purposes for a while now.
639 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
640 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
642 test "x$base_os" != x || case "$os" in
649 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
652 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
656 o=`echo $tail | sed 's/[0-9]*$//'`
657 if test $o != $tail; then
660 # For linux-gnu, try linux-gnu, then linux.
661 o=`echo $tail | sed 's/-.*$//'`
662 if test $o != $tail; then
666 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
669 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
675 # For sparc/sparc32, try sparc/sparc32 and then sparc.
677 tail=$machine${submachine:+/$submachine}
678 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
680 # Prepend the machine's FPU directory unless --without-fp.
681 if test "$with_fp" = yes; then
684 mach="$mach /$1/nofpu"
690 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
693 # Find what sysdep directories exist.
696 for b in $base ''; do
697 for m0 in $mach ''; do
698 for v in /$vendor ''; do
699 test "$v" = / && continue
700 for o in /$ostry ''; do
701 test "$o" = / && continue
702 for m in $multi_arch_d $mach ''; do
703 for d in $add_ons_pfx ''; do
704 for a in $add_ons_sfx ''; do
705 if test -n "$m0$m0sub$b$v$o$m$msub"; then
706 try_srcdir="${srcdir}/"
710 try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
711 test -n "$enable_debug_configure" &&
712 echo "$0 [DEBUG]: try $try" >&2
713 if test -d "$try_srcdir$try"; then
714 sysnames="$sysnames $try"
715 { test -n "$o" || test -n "$b"; } && os_used=t
716 { test -n "$m" || test -n "$m0"; } && machine_used=t
718 x*/$submachine) submachine_used=t ;;
720 if test -n "$d"; then
721 case "$sysnames_add_ons" in
723 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
736 # If the assembler supports gnu_indirect_function symbol type and the
737 # architecture supports multi-arch, we enable multi-arch by default.
738 case $sysnames_add_ons$sysnames in
742 test x"$multi_arch" = xdefault && multi_arch=no
745 if test x"$multi_arch" != xno; then
746 AC_DEFINE(USE_MULTIARCH)
750 if test -z "$os_used" && test "$os" != none; then
751 AC_MSG_ERROR(Operating system $os is not supported.)
753 if test -z "$machine_used" && test "$machine" != none; then
754 AC_MSG_ERROR(The $machine is not supported.)
756 if test -z "$submachine_used" && test -n "$submachine"; then
757 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
761 # We have now validated the configuration.
763 # Expand the list of system names into a full list of directories
764 # from each element's parent name and Implies file (if present).
767 while test $# -gt 0; do
771 case " $names " in *" $name "*)
772 # Already in the list.
776 # Report each name as we discover it, so there is no long pause in output.
777 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
779 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
783 *) xsrcdir=$srcdir/ ;;
785 test -n "$enable_debug_configure" &&
786 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
788 for implies_file in Implies Implies-before Implies-after; do
789 implies_type=`echo $implies_file | sed s/-/_/`
790 eval ${implies_type}=
791 if test -f $xsrcdir$name/$implies_file; then
792 # Collect more names from the `Implies' file (removing comments).
793 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
794 for x in $implied_candidate; do
796 if test -d $xsrcdir$name_base/$x; then
797 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
800 for d in $add_ons_pfx ''; do
804 *) try_srcdir=$srcdir/ ;;
806 test -n "$enable_debug_configure" &&
807 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
808 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
810 eval "${implies_type}=\"\$${implies_type} \$try\""
812 case "$sysnames_add_ons" in
814 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
818 if test $found = no; then
819 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
825 # Add NAME to the list of names.
828 # Find the parent of NAME, using the empty string if it has none.
830 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
833 test -n "$enable_debug_configure" &&
834 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
835 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
837 # Add the names implied by NAME, and NAME's parent (if it has one), to
838 # the list of names to be processed (the argument list). We prepend the
839 # implied names to the list and append the parent. We want implied
840 # directories to come before further directories inferred from the
841 # configuration components; this ensures that for sysv4, unix/common
842 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
844 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
845 test -n "$sysnames" && set $sysnames
848 # Add the default directories.
849 default_sysnames="sysdeps/generic"
850 sysnames="$names $default_sysnames"
852 # The other names were emitted during the scan.
853 AC_MSG_RESULT($default_sysnames)
855 # Collect the list of add-ons that supply partial sysdeps trees.
857 for add_on in $add_ons; do
860 *) xsrcdir="$srcdir/" ;;
863 test -d "$xsrcdir$add_on/sysdeps" || {
864 case "$configured_add_ons " in
867 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
873 sysdeps_add_ons="$sysdeps_add_ons $add_on"
874 case "$sysnames_add_ons" in
877 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
882 for d in $sysnames; do
884 $add_on/sysdeps/*) ;;
887 (cd "$xsrcdir$d" && for f in *[[!~]]; do
891 test -d "$ff" || { test -e "$ff" && exit 88; }
895 test -d "$f" || { test -e "$f" && exit 88; }
899 if test $? -eq 88; then
904 if test $found = no; then
905 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
908 AC_SUBST(sysdeps_add_ons)
914 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
915 # The makefiles need to use a different form to find it in $srcdir.
916 INSTALL='\$(..)./scripts/install-sh -c'
921 AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
923 # Accept binutils 2.20 or newer.
924 AC_CHECK_PROG_VER(AS, $AS, --version,
925 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
926 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
927 AC_CHECK_PROG_VER(LD, $LD, --version,
928 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
929 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
931 # These programs are version sensitive.
933 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
934 [version \([egcygnustpi-]*[0-9.]*\)], [4.[3-9].* | 4.[1-9][0-9].* | [5-9].* ],
935 critic_missing="$critic_missing gcc")
936 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
937 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
938 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
940 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
941 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
942 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
943 MSGFMT=: aux_missing="$aux_missing msgfmt")
944 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
945 [GNU texinfo.* \([0-9][0-9.]*\)],
946 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
947 MAKEINFO=: aux_missing="$aux_missing makeinfo")
948 AC_CHECK_PROG_VER(SED, sed, --version,
949 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
950 [3.0[2-9]*|3.[1-9]*|[4-9]*],
951 SED=: aux_missing="$aux_missing sed")
952 AC_CHECK_PROG_VER(AWK, gawk, --version,
953 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
954 [[3-9].*], critic_missing="$critic_missing gawk")
956 AC_CHECK_TOOL(NM, nm, false)
958 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
960 xno|x|x:) AUTOCONF=no ;;
963 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
964 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
965 libc_cv_autoconf_works=yes
967 libc_cv_autoconf_works=no
969 test $libc_cv_autoconf_works = yes || AUTOCONF=no
972 if test "x$AUTOCONF" = xno; then
973 aux_missing="$aux_missing autoconf"
976 test -n "$critic_missing" && AC_MSG_ERROR([
977 *** These critical programs are missing or too old:$critic_missing
978 *** Check the INSTALL file for required versions.])
980 test -n "$aux_missing" && AC_MSG_WARN([
981 *** These auxiliary programs are missing or incompatible versions:$aux_missing
982 *** some features will be disabled.
983 *** Check the INSTALL file for required versions.])
985 # if using special system headers, find out the compiler's sekrit
986 # header directory and add that to the list. NOTE: Only does the right
987 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
988 if test -n "$sysheaders"; then
989 SYSINCLUDES=-nostdinc
990 for d in include include-fixed; do
991 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
992 SYSINCLUDES="$SYSINCLUDES -isystem $i"
994 SYSINCLUDES="$SYSINCLUDES \
995 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
996 if test -n "$CXX"; then
998 cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
999 cxxheaders=`$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1000 | sed -n -e '1,/#include/d' -e '/^ \//{p;q;}' | sed 's/ //'`
1001 test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
1002 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
1003 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
1006 AC_SUBST(SYSINCLUDES)
1007 AC_SUBST(CXX_SYSINCLUDES)
1009 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1010 # since this would lead to problems installing/building glibc.
1011 # LD_LIBRARY_PATH contains the current directory if one of the following
1013 # - one of the terminals (":" and ";") is the first or last sign
1014 # - two terminals occur directly after each other
1015 # - the path contains an element with a dot in it
1016 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1018 case ${LD_LIBRARY_PATH} in
1019 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1020 ld_library_path_setting="contains current directory"
1023 ld_library_path_setting="ok"
1027 AC_MSG_RESULT($ld_library_path_setting)
1028 if test "$ld_library_path_setting" != "ok"; then
1030 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1031 *** building glibc. Please change the environment variable
1032 *** and run configure again.])
1035 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1036 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1037 libc_cv_gcc_static_libgcc=
1039 libc_cv_gcc_static_libgcc=-static-libgcc
1041 AC_SUBST(libc_cv_gcc_static_libgcc)
1043 AC_PATH_PROG(BASH_SHELL, bash, no)
1044 if test "$BASH_SHELL" != no &&
1045 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1046 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1047 libc_cv_have_bash2=yes
1049 libc_cv_have_bash2=no
1051 AC_SUBST(libc_cv_have_bash2)
1053 dnl We need a ksh compatible shell for tzselect.
1054 if test "$BASH_SHELL" = no; then
1055 AC_PATH_PROG(KSH, ksh, no)
1056 if test "$KSH" = no; then
1059 libc_cv_have_ksh=yes
1064 libc_cv_have_ksh=yes
1066 AC_SUBST(libc_cv_have_ksh)
1068 AC_PATH_PROG(PERL, perl, no)
1069 if test "$PERL" != no &&
1070 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1073 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1074 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1075 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1077 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1079 [#define __need_size_t
1080 #define __need_wchar_t
1083 #include <stddef.h>], [size_t size; wchar_t wchar;
1085 #error stddef.h ignored __need_*
1087 if (&size == NULL || &wchar == NULL) abort ();],
1088 libc_cv_friendly_stddef=yes,
1089 libc_cv_friendly_stddef=no)])
1090 if test $libc_cv_friendly_stddef = yes; then
1091 config_vars="$config_vars
1092 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1095 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1096 libc_cv_need_minus_P, [dnl
1097 cat > conftest.S <<EOF
1098 #include "confdefs.h"
1099 /* Nothing whatsoever. */
1101 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1102 libc_cv_need_minus_P=no
1104 libc_cv_need_minus_P=yes
1107 if test $libc_cv_need_minus_P = yes; then
1108 config_vars="$config_vars
1109 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1112 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1113 cat > conftest.s <<EOF
1116 .set glibc_conftest_frobozz,foo
1117 .globl glibc_conftest_frobozz
1119 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1120 # (but it doesn't work), so we must do a linking check to be sure.
1121 cat > conftest1.c <<\EOF
1122 extern int glibc_conftest_frobozz;
1123 void _start() { glibc_conftest_frobozz = 1; }
1125 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1126 -nostartfiles -nostdlib \
1127 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1128 libc_cv_asm_set_directive=yes
1130 libc_cv_asm_set_directive=no
1133 if test $libc_cv_asm_set_directive = yes; then
1134 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1137 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1138 libc_cv_asm_unique_object, [dnl
1139 cat > conftest.s <<EOF
1142 .type _sym, %gnu_unique_object
1144 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1145 libc_cv_asm_unique_object=yes
1147 libc_cv_asm_unique_object=no
1150 if test $libc_cv_asm_unique_object = yes; then
1151 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1154 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1155 [cat > conftest.s <<EOF
1158 .symver _sym,sym@VERS
1160 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1161 libc_cv_asm_symver_directive=yes
1163 libc_cv_asm_symver_directive=no
1166 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1167 if test $libc_cv_asm_symver_directive = yes; then
1168 cat > conftest.s <<EOF
1171 .symver _sym,sym@VERS
1173 cat > conftest.map <<EOF
1182 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1183 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1184 -o conftest.so conftest.o
1185 -nostartfiles -nostdlib
1186 -Wl,--version-script,conftest.map
1187 1>&AS_MESSAGE_LOG_FD]);
1189 libc_cv_ld_version_script_option=yes
1191 libc_cv_ld_version_script_option=no
1194 libc_cv_ld_version_script_option=no
1197 libc_cv_ld_version_script_option=no
1200 if test $shared != no &&
1201 test $libc_cv_asm_symver_directive = yes &&
1202 test $libc_cv_ld_version_script_option = yes &&
1203 test $enable_versioning = yes; then
1205 AC_DEFINE(DO_VERSIONING)
1209 AC_SUBST(VERSIONING)
1211 if test $shared != no && test $VERSIONING = no; then
1213 *** WARNING: You should not compile GNU libc without versioning. Not using
1214 *** versioning will introduce incompatibilities so that old binaries
1215 *** will not run anymore.
1216 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1218 AC_CACHE_CHECK(for .previous assembler directive,
1219 libc_cv_asm_previous_directive, [dnl
1220 cat > conftest.s <<EOF
1221 .section foo_section
1224 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1225 libc_cv_asm_previous_directive=yes
1227 libc_cv_asm_previous_directive=no
1230 if test $libc_cv_asm_previous_directive = yes; then
1231 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1233 AC_CACHE_CHECK(for .popsection assembler directive,
1234 libc_cv_asm_popsection_directive, [dnl
1235 cat > conftest.s <<EOF
1236 .pushsection foo_section
1239 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1240 libc_cv_asm_popsection_directive=yes
1242 libc_cv_asm_popsection_directive=no
1245 if test $libc_cv_asm_popsection_directive = yes; then
1246 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1249 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1250 libc_cv_asm_protected_directive, [dnl
1251 cat > conftest.s <<EOF
1257 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1258 libc_cv_asm_protected_directive=yes
1260 AC_MSG_ERROR(assembler support for symbol visibility is required)
1264 if test $libc_cv_asm_protected_directive = yes; then
1265 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1266 libc_cv_visibility_attribute,
1267 [cat > conftest.c <<EOF
1268 int foo __attribute__ ((visibility ("hidden"))) = 1;
1269 int bar __attribute__ ((visibility ("protected"))) = 1;
1271 libc_cv_visibility_attribute=no
1272 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1273 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1274 if grep '\.protected.*bar' conftest.s >/dev/null; then
1275 libc_cv_visibility_attribute=yes
1279 rm -f conftest.{c,s}
1281 if test $libc_cv_visibility_attribute != yes; then
1282 AC_MSG_ERROR(compiler support for visibility attribute is required)
1286 if test $libc_cv_visibility_attribute = yes; then
1287 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1288 libc_cv_broken_visibility_attribute,
1289 [cat > conftest.c <<EOF
1291 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1292 int bar (int x) { return x; }
1294 libc_cv_broken_visibility_attribute=yes
1295 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1297 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1299 libc_cv_broken_visibility_attribute=no
1302 rm -f conftest.c conftest.s
1304 if test $libc_cv_broken_visibility_attribute = yes; then
1305 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1309 AC_CACHE_CHECK(for broken __attribute__((alias())),
1310 libc_cv_broken_alias_attribute,
1311 [cat > conftest.c <<EOF
1312 extern int foo (int x) __asm ("xyzzy");
1313 int bar (int x) { return x; }
1314 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1316 extern __typeof (dfoo) dfoo __asm ("abccb");
1319 libc_cv_broken_alias_attribute=yes
1320 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1321 if grep 'xyzzy' conftest.s >/dev/null &&
1322 grep 'abccb' conftest.s >/dev/null; then
1323 libc_cv_broken_alias_attribute=no
1326 rm -f conftest.c conftest.s
1328 if test $libc_cv_broken_alias_attribute = yes; then
1329 AC_MSG_ERROR(working alias attribute support required)
1332 if test $libc_cv_visibility_attribute = yes; then
1333 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1334 libc_cv_have_sdata_section,
1335 [echo "int i;" > conftest.c
1336 libc_cv_have_sdata_section=no
1337 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1338 | grep '\.sdata' >/dev/null; then
1339 libc_cv_have_sdata_section=yes
1341 rm -f conftest.c conftest.so
1343 if test $libc_cv_have_sdata_section = yes; then
1344 AC_DEFINE(HAVE_SDATA_SECTION)
1348 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1349 libc_cv_initfini_array, [dnl
1350 LIBC_TRY_LINK_STATIC([
1351 int foo (void) { return 1; }
1352 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1354 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1355 libc_cv_initfini_array=yes
1357 libc_cv_initfini_array=no
1359 [libc_cv_initfini_array=no])
1361 if test $libc_cv_initfini_array != yes; then
1362 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1365 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1366 libc_cv_ctors_header, [dnl
1367 libc_cv_ctors_header=yes
1368 LIBC_TRY_LINK_STATIC([
1369 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1370 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1373 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1374 { gsub(/\@<:@ */, "@<:@") }
1375 $2 == ".ctors" || $2 == ".dtors" {
1376 size = strtonum("0x" $6)
1377 align = strtonum("0x" $NF)
1379 stub@<:@$2@:>@ = size == align * 2
1382 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1383 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1384 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1386 '], [libc_cv_ctors_header=no])
1388 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1391 if test $libc_cv_ctors_header = no; then
1392 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1395 AC_CACHE_CHECK(for libunwind-support in compiler,
1396 libc_cv_cc_with_libunwind, [
1397 cat > conftest.c <<EOF
1398 int main (void) { return 0; }
1400 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1401 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1402 libc_cv_cc_with_libunwind=yes
1404 libc_cv_cc_with_libunwind=no
1407 AC_SUBST(libc_cv_cc_with_libunwind)
1408 if test $libc_cv_cc_with_libunwind = yes; then
1409 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1412 AC_CACHE_CHECK(for -z nodelete option,
1413 libc_cv_z_nodelete, [dnl
1414 cat > conftest.c <<EOF
1415 int _start (void) { return 42; }
1417 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1418 -fPIC -shared -o conftest.so conftest.c
1419 -nostartfiles -nostdlib
1420 -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1422 libc_cv_z_nodelete=yes
1424 AC_MSG_ERROR(linker with -z nodelete support required)
1428 AC_CACHE_CHECK(for -z nodlopen option,
1429 libc_cv_z_nodlopen, [dnl
1430 cat > conftest.c <<EOF
1431 int _start (void) { return 42; }
1433 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1434 -fPIC -shared -o conftest.so conftest.c
1435 -nostartfiles -nostdlib
1436 -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1438 libc_cv_z_nodlopen=yes
1440 AC_MSG_ERROR(linker with -z nodlopen support required)
1444 AC_CACHE_CHECK(for -z initfirst option,
1445 libc_cv_z_initfirst, [dnl
1446 cat > conftest.c <<EOF
1447 int _start (void) { return 42; }
1449 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1450 -fPIC -shared -o conftest.so conftest.c
1451 -nostartfiles -nostdlib
1452 -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1454 libc_cv_z_initfirst=yes
1456 AC_MSG_ERROR(linker with -z initfirst support required)
1460 # Add-on fragments can set these for other machines.
1461 libc_commonpagesize=${libc_commonpagesize:-no}
1462 libc_relro_required=${libc_relro_required:-no}
1463 case "$base_machine" in
1464 i[[34567]]86 | x86_64 | powerpc* | s390*)
1465 libc_commonpagesize=0x1000
1466 libc_relro_required=yes
1469 libc_commonpagesize=0x2000
1470 libc_relro_required=yes
1474 if test $libc_commonpagesize != no; then
1475 AC_CACHE_CHECK(for -z relro option,
1476 libc_cv_z_relro, [dnl
1478 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1479 int _start (void) { return 42; }
1480 extern void _exit (int);
1481 /* Since these pointers are const, they should go in rodata.
1482 Since they refer to functions that have to be resolved by
1483 dynamic linking, they should instead go in RELRO data. */
1484 const void *const relro[] = { &_start, &_exit, 0 };
1485 /* GNU ld fails to produce RELRO data when it's very small and there is no
1486 normal writable data following it, or if only uninitialized (.bss) data
1487 follows it, or only very small writable data. */
1488 int data[0x10000] = { 1, };
1490 cat > conftest.awk <<\EOF
1493 commonpagesize = strtonum(commonpagesize)
1495 { print "LINE:", $0 > "/dev/stderr" }
1497 vaddr = strtonum($3)
1498 memsz = strtonum($6)
1500 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1501 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1502 result = (end % commonpagesize == 0) ? "yes" : "broken"
1504 END { print result }
1506 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1507 -fPIC -shared -o conftest.so conftest.c
1508 -nostartfiles -nostdlib
1509 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1510 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1512 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1513 conftest.ph > conftest.cps
1515 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1517 if { test "x$libc_relro_required" = xyes &&
1518 test "x$libc_cv_z_relro" != xyes
1521 AC_MSG_ERROR(linker with -z relro support required)
1524 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1527 AC_CACHE_CHECK(for -Bgroup option,
1528 libc_cv_Bgroup, [dnl
1529 cat > conftest.c <<EOF
1530 int _start (void) { return 42; }
1532 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1533 -fPIC -shared -o conftest.so conftest.c
1534 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1541 AC_SUBST(libc_cv_Bgroup)
1544 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1545 libc_cv_as_noexecstack, [dnl
1546 cat > conftest.c <<EOF
1549 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1550 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1551 && grep .note.GNU-stack conftest.s >/dev/null \
1552 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1553 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1555 libc_cv_as_noexecstack=yes
1557 libc_cv_as_noexecstack=no
1560 if test $libc_cv_as_noexecstack = yes; then
1561 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1563 AC_SUBST(ASFLAGS_config)
1565 AC_CACHE_CHECK(for -z combreloc,
1566 libc_cv_z_combreloc, [dnl
1567 cat > conftest.c <<EOF
1568 extern int bar (int);
1570 int foo (void) { return bar (mumble); }
1572 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1573 -fPIC -shared -o conftest.so conftest.c
1574 -nostdlib -nostartfiles
1575 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1577 dnl The following test is a bit weak. We must use a tool which can test
1578 dnl cross-platform since the gcc used can be a cross compiler. Without
1579 dnl introducing new options this is not easily doable. Instead use a tool
1580 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1581 dnl look for a section named .rel.dyn.
1582 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1583 libc_cv_z_combreloc=yes
1585 libc_cv_z_combreloc=no
1588 libc_cv_z_combreloc=no
1591 if test "$libc_cv_z_combreloc" = yes; then
1592 AC_DEFINE(HAVE_Z_COMBRELOC)
1594 AC_SUBST(libc_cv_z_combreloc)
1596 AC_CACHE_CHECK(for -z execstack,
1597 libc_cv_z_execstack, [dnl
1598 cat > conftest.c <<EOF
1599 int _start (void) { return 42; }
1601 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1602 -fPIC -shared -o conftest.so conftest.c
1603 -Wl,-z,execstack -nostdlib
1604 1>&AS_MESSAGE_LOG_FD])
1606 libc_cv_z_execstack=yes
1608 libc_cv_z_execstack=no
1611 AC_SUBST(libc_cv_z_execstack)
1613 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1614 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1617 AC_SUBST(libc_cv_fpie)
1619 AC_CACHE_CHECK(for --hash-style option,
1620 libc_cv_hashstyle, [dnl
1621 cat > conftest.c <<EOF
1622 int _start (void) { return 42; }
1624 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1625 -fPIC -shared -o conftest.so conftest.c
1626 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1628 libc_cv_hashstyle=yes
1630 libc_cv_hashstyle=no
1633 AC_SUBST(libc_cv_hashstyle)
1635 # The linker's default -shared behavior is good enough if it
1636 # does these things that our custom linker scripts ensure that
1637 # all allocated NOTE sections come first.
1638 if test "$use_default_link" = default; then
1639 AC_CACHE_CHECK([for sufficient default -shared layout],
1640 libc_cv_use_default_link, [dnl
1641 libc_cv_use_default_link=no
1642 cat > conftest.s <<\EOF
1643 .section .note.a,"a",%note
1648 .section .note.b,"a",%note
1654 if AC_TRY_COMMAND([dnl
1655 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1656 ac_try=`$READELF -S conftest.so | sed -n \
1658 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1664 libc_seen_a=no libc_seen_b=no
1666 while test $# -ge 2 -a "$1" = NOTE; do
1668 .note.a) libc_seen_a=yes ;;
1669 .note.b) libc_seen_b=yes ;;
1673 case "$libc_seen_a$libc_seen_b" in
1675 libc_cv_use_default_link=yes
1678 echo >&AS_MESSAGE_LOG_FD "\
1679 $libc_seen_a$libc_seen_b from:
1685 use_default_link=$libc_cv_use_default_link
1688 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1689 if libc_cv_output_format=`
1690 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1694 libc_cv_output_format=
1696 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1697 AC_SUBST(libc_cv_output_format)
1699 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1700 cat > conftest.c <<EOF
1703 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1704 conftest.c 1>&AS_MESSAGE_LOG_FD])
1706 libc_cv_fno_toplevel_reorder=yes
1708 libc_cv_fno_toplevel_reorder=no
1711 if test $libc_cv_fno_toplevel_reorder = yes; then
1712 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1714 fno_unit_at_a_time=-fno-unit-at-a-time
1716 AC_SUBST(fno_unit_at_a_time)
1718 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1719 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1723 AC_SUBST(libc_cv_ssp)
1725 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1726 cat > conftest.c <<EOF
1728 #ifdef __GNUC_GNU_INLINE__
1729 main () { return 0;}
1734 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1735 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1737 libc_cv_gnu89_inline=yes
1739 libc_cv_gnu89_inline=no
1742 if test $libc_cv_gnu89_inline = yes; then
1743 gnu89_inline=-fgnu89-inline
1747 AC_SUBST(gnu89_inline)
1749 AC_CACHE_CHECK(whether cc puts quotes around section names,
1750 libc_cv_have_section_quotes,
1751 [cat > conftest.c <<EOF
1752 static const int foo
1753 __attribute__ ((section ("bar"))) = 1;
1755 if ${CC-cc} -S conftest.c -o conftest.s; then
1756 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1757 libc_cv_have_section_quotes=yes
1759 libc_cv_have_section_quotes=no
1762 libc_cv_have_section_quotes=unknown
1764 rm -f conftest.{c,s}
1766 if test $libc_cv_have_section_quotes = yes; then
1767 AC_DEFINE(HAVE_SECTION_QUOTES)
1770 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1772 cat > conftest.s <<EOF
1777 .weak bar; bar = foo
1779 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1780 libc_cv_asm_weak_directive=yes
1782 libc_cv_asm_weak_directive=no
1786 if test $libc_cv_asm_weak_directive = no; then
1787 AC_CACHE_CHECK(for assembler .weakext directive,
1788 libc_cv_asm_weakext_directive,
1790 cat > conftest.s <<EOF
1799 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1800 libc_cv_asm_weakext_directive=yes
1802 libc_cv_asm_weakext_directive=no
1808 if test $libc_cv_asm_weak_directive = yes; then
1809 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1810 elif test $libc_cv_asm_weakext_directive = yes; then
1811 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1814 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1816 sparc/sparc64*) cfi_offset=2047;;
1819 cat > conftest.s <<EOF
1821 .type func,%function
1825 .cfi_rel_offset 1, $cfi_offset
1828 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1829 libc_cv_asm_cfi_directives=yes
1831 libc_cv_asm_cfi_directives=no
1834 if test $libc_cv_asm_cfi_directives = yes; then
1835 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1838 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1839 cat > conftest.c <<\EOF
1844 dnl No \ in command here because it ends up inside ''.
1845 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1846 -nostdlib -nostartfiles -Wl,--no-whole-archive
1847 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1848 libc_cv_ld_no_whole_archive=yes
1850 libc_cv_ld_no_whole_archive=no
1853 if test $libc_cv_ld_no_whole_archive = no; then
1854 AC_MSG_ERROR([support for --no-whole-archive is needed])
1857 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1858 cat > conftest.c <<\EOF
1863 dnl No \ in command here because it ends up inside ''.
1864 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1865 -nostdlib -nostartfiles -fexceptions
1866 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1867 libc_cv_gcc_exceptions=yes
1869 libc_cv_gcc_exceptions=no
1872 if test $libc_cv_gcc_exceptions = yes; then
1873 exceptions=-fexceptions
1875 AC_SUBST(exceptions)dnl
1877 if test "$host_cpu" = powerpc ; then
1878 # Check for a bug present in at least versions 2.8.x of GCC
1879 # and versions 1.0.x of EGCS.
1880 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1881 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1882 libc_cv_c_asmcr0_bug='no',
1883 libc_cv_c_asmcr0_bug='yes')])
1884 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1885 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1889 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1890 cat > conftest.c <<\EOF
1893 __builtin_memset (x, 0, 1000);
1897 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1899 libc_cv_gcc_builtin_memset=no
1901 libc_cv_gcc_builtin_memset=yes
1904 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1905 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1908 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1909 cat > conftest.c <<\EOF
1910 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1911 char *foo (const char *a, const char *b)
1913 return __builtin_strstr (a, b);
1917 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1919 libc_cv_gcc_builtin_redirection=yes
1921 libc_cv_gcc_builtin_redirection=no
1924 if test "$libc_cv_gcc_builtin_redirection" = no; then
1925 AC_MSG_ERROR([support for the symbol redirection needed])
1928 dnl Check whether the compiler supports the __thread keyword.
1929 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1930 [cat > conftest.c <<\EOF
1931 __thread int a = 42;
1933 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1934 libc_cv_gcc___thread=yes
1936 libc_cv_gcc___thread=no
1939 if test "$libc_cv_gcc___thread" = no; then
1940 AC_MSG_ERROR([support for the __thread keyword is required])
1943 dnl Check whether the compiler supports the tls_model attribute.
1944 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1945 cat > conftest.c <<\EOF
1946 extern __thread int a __attribute__((tls_model ("initial-exec")));
1948 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1949 libc_cv_gcc_tls_model_attr=yes
1951 libc_cv_gcc_tls_model_attr=no
1954 if test "$libc_cv_gcc_tls_model_attr" = no; then
1955 AC_MSG_ERROR([support for the tls_model attribute is required])
1958 dnl Determine how to disable generation of FMA instructions.
1959 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1960 libc_cv_cc_nofma, [dnl
1962 for opt in -ffp-contract=off -mno-fused-madd; do
1963 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1966 if test -n "$submachine"; then
1967 AC_CACHE_CHECK([for compiler option for CPU variant],
1968 libc_cv_cc_submachine, [dnl
1969 libc_cv_cc_submachine=no
1970 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1971 LIBC_TRY_CC_OPTION([$opt], [
1972 libc_cv_cc_submachine="$opt"
1975 if test "x$libc_cv_cc_submachine" = xno; then
1976 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1979 AC_SUBST(libc_cv_cc_submachine)
1981 dnl Check whether we have the gd library available.
1982 AC_MSG_CHECKING(for libgd)
1983 if test "$with_gd" != "no"; then
1984 old_CFLAGS="$CFLAGS"
1985 CFLAGS="$CFLAGS $libgd_include"
1986 old_LDFLAGS="$LDFLAGS"
1987 LDFLAGS="$LDFLAGS $libgd_ldflags"
1989 LIBS="$LIBS -lgd -lpng -lz -lm"
1990 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1991 CFLAGS="$old_CFLAGS"
1992 LDFLAGS="$old_LDFLAGS"
1997 AC_MSG_RESULT($LIBGD)
2001 if test x$with_selinux = xno ; then
2004 # See if we have the SELinux library
2005 AC_CHECK_LIB(selinux, is_selinux_enabled,
2006 have_selinux=yes, have_selinux=no)
2007 # See if we have the SELinux header with the NSCD permissions in it.
2008 if test x$have_selinux = xyes ; then
2009 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
2010 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
2011 [#ifdef NSCD__SHMEMHOST
2014 #error NSCD__SHMEMHOST not defined
2016 have_selinux=yes, have_selinux=no)
2017 AC_MSG_RESULT($have_selinux)
2020 if test x$with_selinux = xyes ; then
2021 if test x$have_selinux = xno ; then
2022 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
2026 # Check if we're building with SELinux support.
2027 if test "x$have_selinux" = xyes; then
2028 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
2030 # See if we have the libaudit library
2031 AC_CHECK_LIB(audit, audit_log_user_avc_message,
2032 have_libaudit=yes, have_libaudit=no)
2033 if test "x$have_libaudit" = xyes; then
2034 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2036 AC_SUBST(have_libaudit)
2038 # See if we have the libcap library
2039 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2040 if test "x$have_libcap" = xyes; then
2041 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2043 AC_SUBST(have_libcap)
2045 AC_SUBST(have_selinux)
2047 dnl check for the size of 'long double'.
2048 AC_CHECK_SIZEOF(long double, 0)
2049 sizeof_long_double=$ac_cv_sizeof_long_double
2050 AC_SUBST(sizeof_long_double)
2053 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2054 dnl Since we are building the implementations of the fortified functions here,
2055 dnl having the macro defined interacts very badly.
2056 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2057 [AC_TRY_COMPILE([], [
2058 #ifdef _FORTIFY_SOURCE
2061 [libc_cv_predef_fortify_source=no],
2062 [libc_cv_predef_fortify_source=yes])])
2063 if test $libc_cv_predef_fortify_source = yes; then
2064 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2068 dnl Check for silly hacked compilers inserting -fstack-protector.
2069 dnl This breaks badly for the early startup code we compile, since
2070 dnl the compiled code can refer to a magic machine-dependent location
2071 dnl for the canary value before we have sufficient setup for that to
2072 dnl work. It's also questionable to build all of libc with this flag
2073 dnl even when you're doing that for most applications you build, since
2074 dnl libc's code is so heavily-used and performance-sensitive. If we
2075 dnl ever really want to make that work, it should be enabled explicitly
2076 dnl in the libc build, not inherited from implicit compiler settings.
2077 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2078 libc_cv_predef_stack_protector, [
2079 AC_TRY_COMPILE([extern void foobar (char *);],
2080 [char large_array[2048]; foobar (large_array);], [
2081 libc_undefs=`$NM -u conftest.o |
2082 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2083 2>&AS_MESSAGE_LOG_FD` || {
2084 AC_MSG_ERROR([confusing output from $NM -u])
2086 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2087 # On some architectures, there are architecture-specific undefined
2088 # symbols (resolved by the linker), so filter out unknown symbols.
2089 # This will fail to produce the correct result if the compiler
2090 # defaults to -fstack-protector but this produces an undefined symbol
2091 # other than __stack_chk_fail. However, compilers like that have not
2092 # been encountered in practice.
2093 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2094 case "$libc_undefs" in
2095 foobar) libc_cv_predef_stack_protector=no ;;
2097 foobar') libc_cv_predef_stack_protector=yes ;;
2098 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2100 [AC_MSG_ERROR([test compilation failed])])
2103 if test $libc_cv_predef_stack_protector = yes; then
2104 libc_extra_cflags=-fno-stack-protector
2106 AC_SUBST(libc_extra_cflags)
2108 ### End of automated tests.
2109 ### Now run sysdeps configure fragments.
2111 # They also can set these variables.
2113 ldd_rewrite_script=no
2114 libc_cv_sysconfdir=$sysconfdir
2115 libc_cv_localstatedir=$localstatedir
2116 libc_cv_gcc_unwind_find_fde=no
2119 # Iterate over all the sysdep directories we will use, running their
2120 # configure fragments.
2121 for dir in $sysnames; do
2124 *) dest=$srcdir/$dir ;;
2126 if test -r $dest/configure; then
2127 AC_MSG_RESULT(running configure fragment for $dir)
2132 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2133 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2135 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2137 # A sysdeps configure fragment can reset this if IFUNC is not actually
2138 # usable even though the assembler knows how to generate the symbol type.
2139 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2140 AC_DEFINE(HAVE_IFUNC)
2143 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2144 # configure fragment can override the value to prevent this AC_DEFINE.
2146 if test "x$use_nscd" != xno; then
2147 AC_DEFINE([USE_NSCD])
2149 if test "x$build_nscd" = xdefault; then
2150 build_nscd=$use_nscd
2153 # Test for old glibc 2.0.x headers so that they can be removed properly
2154 # Search only in includedir.
2155 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2156 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2158 old_glibc_headers=yes
2160 old_glibc_headers=no
2162 AC_MSG_RESULT($old_glibc_headers)
2163 if test ${old_glibc_headers} = yes; then
2164 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2165 AC_MSG_WARN(*** be removed.)
2167 AC_SUBST(old_glibc_headers)
2169 AC_SUBST(libc_cv_slibdir)
2170 AC_SUBST(libc_cv_localedir)
2171 AC_SUBST(libc_cv_sysconfdir)
2172 AC_SUBST(libc_cv_localstatedir)
2173 AC_SUBST(libc_cv_rootsbindir)
2174 AC_SUBST(libc_cv_forced_unwind)
2176 dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
2177 AC_SUBST(libc_cv_cc_sse4)
2178 AC_SUBST(libc_cv_cc_avx)
2179 AC_SUBST(libc_cv_cc_sse2avx)
2180 AC_SUBST(libc_cv_cc_novzeroupper)
2181 AC_SUBST(libc_cv_cc_fma4)
2182 AC_SUBST(libc_cv_cc_nofma)
2183 AC_SUBST(libc_cv_as_i686)
2184 AC_SUBST(libc_cv_sparc_as_vis3)
2186 if test x$use_ldconfig = xyes; then
2187 AC_DEFINE(USE_LDCONFIG)
2189 AC_SUBST(use_ldconfig)
2190 AC_SUBST(ldd_rewrite_script)
2195 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2196 [libc_cv_pic_default=yes
2197 cat > conftest.c <<EOF
2198 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2199 # error PIC is default.
2202 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2203 libc_cv_pic_default=no
2206 AC_SUBST(libc_cv_pic_default)
2209 AC_SUBST(static_nss)
2213 dnl See sysdeps/mach/configure.in for this variable.
2214 AC_SUBST(mach_interface_list)
2216 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2217 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2221 AC_CONFIG_FILES([config.make Makefile])
2222 AC_CONFIG_COMMANDS([default],[[
2223 case $CONFIG_FILES in *config.make*)
2224 echo "$config_vars" >> config.make;;
2226 test -d bits || mkdir bits]],[[config_vars='$config_vars']])