1 dnl Process this file with autoconf to produce a configure script.
2 AC_PREREQ(2.53)dnl dnl Minimum Autoconf version required.
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 # Glibc should not depend on any header files
9 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
10 [m4_divert_text([DEFAULTS],
11 [ac_includes_default='/* none */'])])
13 dnl This is here so we can set $subdirs directly based on configure fragments.
19 if test $host != $build; then
20 AC_CHECK_PROGS(BUILD_CC, gcc cc)
22 AC_SUBST(cross_compiling)
24 # We need the C++ compiler only for testing.
27 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
28 AC_MSG_ERROR([you must configure in a separate build directory])
31 # This will get text that should go into config.make.
34 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
36 AC_HELP_STRING([--with-gd=DIR],
37 [find libgd include dir and library with prefix DIR]),
41 *) libgd_include="-I$withval/include"
42 libgd_ldflags="-L$withval/lib" ;;
45 AC_ARG_WITH([gd-include],
46 AC_HELP_STRING([--with-gd-include=DIR],
47 [find libgd include files in DIR]),
49 case "$with_gd_include" in
51 *) libgd_include="-I$withval" ;;
55 AC_HELP_STRING([--with-gd-lib=DIR],
56 [find libgd library files in DIR]),
58 case "$with_gd_lib" in
60 *) libgd_ldflags="-L$withval" ;;
64 if test -n "$libgd_include"; then
65 config_vars="$config_vars
66 CFLAGS-memusagestat.c = $libgd_include"
68 if test -n "$libgd_ldflags"; then
69 config_vars="$config_vars
70 libgd-LDFLAGS = $libgd_ldflags"
73 dnl Arguments to specify presence of other packages/features.
75 AC_HELP_STRING([--with-fp],
76 [if using floating-point hardware @<:@default=yes@:>@]),
80 AC_ARG_WITH([binutils],
81 AC_HELP_STRING([--with-binutils=PATH],
82 [specify location of binutils (as and ld)]),
83 [path_binutils=$withval],
85 AC_ARG_WITH([selinux],
86 AC_HELP_STRING([--with-selinux],
87 [if building with SELinux support]),
88 [with_selinux=$withval],
91 AC_ARG_WITH([headers],
92 AC_HELP_STRING([--with-headers=PATH],
93 [location of system headers to use
94 (for example /usr/src/linux/include)
95 @<:@default=compiler default@:>@]),
96 [sysheaders=$withval],
100 AC_SUBST(use_default_link)
101 AC_ARG_WITH([default-link],
102 AC_HELP_STRING([--with-default-link],
103 [do not use explicit linker scripts]),
104 [use_default_link=$withval],
105 [use_default_link=default])
107 AC_ARG_ENABLE([sanity-checks],
108 AC_HELP_STRING([--disable-sanity-checks],
109 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
110 [enable_sanity=$enableval],
113 AC_ARG_ENABLE([shared],
114 AC_HELP_STRING([--enable-shared],
115 [build shared library @<:@default=yes if GNU ld@:>@]),
118 AC_ARG_ENABLE([profile],
119 AC_HELP_STRING([--enable-profile],
120 [build profiled library @<:@default=no@:>@]),
121 [profile=$enableval],
123 AC_ARG_ENABLE([versioning],
124 AC_HELP_STRING([--disable-versioning],
125 [do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
126 [enable_versioning=$enableval],
127 [enable_versioning=yes])
129 AC_ARG_ENABLE([oldest-abi],
130 AC_HELP_STRING([--enable-oldest-abi=ABI],
131 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
132 [oldest_abi=$enableval],
134 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
137 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
141 AC_ARG_ENABLE([stackguard-randomization],
142 AC_HELP_STRING([--enable-stackguard-randomization],
143 [initialize __stack_chk_guard canary with a random number at program start]),
144 [enable_stackguard_randomize=$enableval],
145 [enable_stackguard_randomize=no])
146 if test "$enable_stackguard_randomize" = yes; then
147 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
150 dnl Generic infrastructure for drop-in additions to libc.
151 AC_ARG_ENABLE([add-ons],
152 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
153 [configure and build add-ons in DIR1,DIR2,...
154 search for add-ons if no parameter given]),
155 , [enable_add_ons=yes])
157 AC_ARG_ENABLE([hidden-plt],
158 AC_HELP_STRING([--disable-hidden-plt],
159 [do not hide internal function calls to avoid PLT]),
162 if test "x$hidden" = xno; then
166 AC_ARG_ENABLE([bind-now],
167 AC_HELP_STRING([--enable-bind-now],
168 [disable lazy relocations in DSOs]),
169 [bindnow=$enableval],
173 dnl On some platforms we cannot use dynamic loading. We must provide
174 dnl static NSS modules.
175 AC_ARG_ENABLE([static-nss],
176 AC_HELP_STRING([--enable-static-nss],
177 [build static NSS modules @<:@default=no@:>@]),
178 [static_nss=$enableval],
180 dnl Enable static NSS also if we build no shared objects.
181 if test x"$static_nss" = xyes || test x"$shared" = xno; then
183 AC_DEFINE(DO_STATIC_NSS)
186 AC_ARG_ENABLE([force-install],
187 AC_HELP_STRING([--disable-force-install],
188 [don't force installation of files from this package, even if they are older than the installed files]),
189 [force_install=$enableval],
191 AC_SUBST(force_install)
193 dnl On some platforms we allow dropping compatibility with all kernel
195 AC_ARG_ENABLE([kernel],
196 AC_HELP_STRING([--enable-kernel=VERSION],
197 [compile for compatibility with kernel not older than VERSION]),
198 [minimum_kernel=$enableval],
200 dnl Prevent unreasonable values.
201 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
202 # Better nothing than this.
205 if test "$minimum_kernel" = current; then
206 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
210 dnl For the development we sometimes want gcc to issue even more warnings.
211 dnl This is not the default since many of the extra warnings are not
213 AC_ARG_ENABLE([all-warnings],
214 AC_HELP_STRING([--enable-all-warnings],
215 [enable all useful warnings gcc can issue]),
216 [all_warnings=$enableval],
218 AC_SUBST(all_warnings)
220 AC_ARG_ENABLE([multi-arch],
221 AC_HELP_STRING([--enable-multi-arch],
222 [enable single DSO with optimizations for multiple architectures]),
223 [multi_arch=$enableval],
224 [multi_arch=default])
226 AC_ARG_ENABLE([nss-crypt],
227 AC_HELP_STRING([--enable-nss-crypt],
228 [enable libcrypt to use nss]),
229 [nss_crypt=$enableval],
231 if test x$nss_crypt = xyes; then
232 nss_includes=-I$(nss-config --includedir 2>/dev/null)
233 if test $? -ne 0; then
234 AC_MSG_ERROR([cannot find include directory with nss-config])
237 CFLAGS="$CFLAGS $nss_includes"
238 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
240 #include <nsslowhash.h>
241 void f (void) { NSSLOW_Init (); }])],
242 libc_cv_nss_crypt=yes,
244 cannot find NSS headers with lowlevel hash function interfaces]))
246 LIBS="$LIBS -lfreebl3"
247 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
249 #include <nsslowhash.h>],
251 libc_cv_nss_crypt=yes,
253 cannot link program using lowlevel NSS hash functions]))
259 AC_SUBST(libc_cv_nss_crypt)
262 AC_ARG_ENABLE([obsolete-rpc],
263 AC_HELP_STRING([--enable-obsolete-rpc],
264 [build and install the obsolete RPC code for link-time usage]),
265 [link_obsolete_rpc=$enableval],
266 [link_obsolete_rpc=no])
267 AC_SUBST(link_obsolete_rpc)
269 if test "$link_obsolete_rpc" = yes; then
270 AC_DEFINE(LINK_OBSOLETE_RPC)
273 AC_ARG_ENABLE([systemtap],
274 [AS_HELP_STRING([--enable-systemtap],
275 [enable systemtap static probe points @<:@default=no@:>@])],
276 [systemtap=$enableval],
278 if test "x$systemtap" != xno; then
279 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
281 CFLAGS="-std=gnu99 $CFLAGS"
282 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
283 void foo (int i, void *p)
285 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
286 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
287 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
288 CFLAGS="$old_CFLAGS"])
289 if test $libc_cv_sdt = yes; then
290 AC_DEFINE([USE_STAP_PROBE])
291 elif test "x$systemtap" != xauto; then
292 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
296 AC_ARG_ENABLE([build-nscd],
297 [AS_HELP_STRING([--disable-build-nscd],
298 [disable building and installing the nscd daemon])],
299 [build_nscd=$enableval],
300 [build_nscd=default])
303 # Note the use of $use_nscd is near the bottom of the file.
304 AC_ARG_ENABLE([nscd],
305 [AS_HELP_STRING([--disable-nscd],
306 [library functions will not contact the nscd daemon])],
307 [use_nscd=$enableval],
310 # The way shlib-versions is used to generate soversions.mk uses a
311 # fairly simplistic model for name recognition that can't distinguish
312 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
313 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
314 # tell. This doesn't get used much beyond that, so it's fairly safe.
319 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
323 # We keep the original values in `$config_*' and never modify them, so we
324 # can write them unchanged into config.make. Everything else uses
325 # $machine, $vendor, and $os, and changes them whenever convenient.
326 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
328 # Don't allow vendor == "unknown"
329 test "$config_vendor" = unknown && config_vendor=
330 config_os="`echo $config_os | sed 's/^unknown-//'`"
332 # Some configurations imply other options.
335 # The configure fragment of an add-on port can modify these to supplement
336 # or override the table in the case statement below. No fragment should
337 # ever change the config_* variables, however.
338 machine=$config_machine
339 vendor=$config_vendor
343 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
345 if test "$machine" = rs6000; then
349 # Braindead PowerPC box with absolutely no FPU.
350 case "$machine-$host_os" in
358 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
361 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
363 *) submachine="$withval" ;;
367 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
368 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
370 # An add-on can set this when it wants to disable the sanity check below.
373 dnl Having this here, though empty, makes sure that if add-ons' fragments
374 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
375 dnl our AC_OUTPUT will actually use it.
378 case "$enable_add_ons" in
381 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
382 sed 's@/[[^/]]*$@@' | sort | uniq`
383 add_ons_automatic=yes
385 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
386 add_ons_automatic=no ;;
392 if test x"$add_ons" != x; then
393 for f in $add_ons; do
398 *** It seems that you're using an old \`crypt' add-on. crypt is now
399 *** part of glibc and using the old add-on will not work with this
400 *** release. Start again with fresh sources and without the old
401 *** \`crypt' add-on.])
405 *** It seems that you're using an old \`localedata' add-on. localedata
406 *** is now part of glibc and using the old add-on will not work with
407 *** this release. Start again with fresh sources and without the old
408 *** \`localedata' add-on.])
413 # Now source each add-on's configure fragment.
414 # The fragments can use $srcdir/$libc_add_on to find themselves,
415 # and test $add_ons_automatic to see if they were explicitly requested.
416 # A fragment can clear (or even change) $libc_add_on to affect
417 # whether it goes into the list to be actually used in the build.
419 for libc_add_on in $add_ons; do
420 # Test whether such a directory really exists.
421 # It can be absolute, or relative to $srcdir, or relative to the build dir.
422 case "$libc_add_on" in
424 libc_add_on_srcdir=$libc_add_on
427 test -d "$srcdir/$libc_add_on" || {
428 if test -d "$libc_add_on"; then
429 libc_add_on="`pwd`/$libc_add_on"
431 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
434 libc_add_on_srcdir=$srcdir/$libc_add_on
438 libc_add_on_frag=$libc_add_on_srcdir/configure
439 libc_add_on_canonical=
440 libc_add_on_config_subdirs=
441 if test -r "$libc_add_on_frag"; then
442 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
443 libc_add_on_canonical=unknown
445 . "$libc_add_on_frag"
446 test -z "$libc_add_on" || {
447 configured_add_ons="$configured_add_ons $libc_add_on"
448 if test "x$libc_add_on_canonical" = xunknown; then
449 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
451 for d in $libc_add_on_subdirs; do
452 case "$libc_add_on" in
453 /*) subdir_srcdir="$libc_add_on" ;;
454 *) subdir_srcdir="\$(..)$libc_add_on" ;;
458 d="${libc_add_on_canonical:-$libc_add_on}"
464 subdir_srcdir="$subdir_srcdir/$d"
467 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
468 add_on_subdirs="$add_on_subdirs $d"
469 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
470 $d-srcdir = $subdir_srcdir"
472 for d in $libc_add_on_config_subdirs; do
475 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
477 if test ! -d "$libc_add_on_srcdir/$d"; then
478 AC_MSG_ERROR(fragment wants to configure missing directory $d)
480 case "$libc_add_on" in
482 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
484 subdirs="$subdirs $libc_add_on/$d"
488 if test -n "$libc_add_on"; then
489 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
490 use_add_ons="$use_add_ons $libc_add_on"
491 add_ons_pfx="$add_ons_pfx $libc_add_on/"
492 test -z "$libc_add_on_canonical" ||
493 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
496 # Use echo to strip excess whitespace.
497 add_ons="`echo $use_add_ons`"
500 AC_SUBST(add_on_subdirs)
504 ### I put this here to prevent those annoying emails from people who cannot
505 ### read and try to compile glibc on unsupported platforms. --drepper
507 ### By using the undocumented --enable-hacker-mode option for configure
508 ### one can skip this test to make the configuration not fail for unsupported
511 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
512 case "$machine-$host_os" in
516 echo "*** The GNU C library is currently not available for this platform."
517 echo "*** So far nobody cared to port it and if there is no volunteer it"
518 echo "*** might never happen. So, if you have interest to see glibc on"
519 echo "*** this platform visit"
520 echo "*** http://www.gnu.org/software/libc/porting.html"
521 echo "*** and join the group of porters"
527 dnl We need to use [ and ] for other purposes for a while now.
529 # Expand the configuration machine name into a subdirectory by architecture
530 # type and particular chip. If an add-on configure fragment already set
531 # base_machine, we don't change it.
532 test -n "$base_machine" || case "$machine" in
533 i[34567]86) base_machine=i386 machine=i386/$machine ;;
534 powerpc) base_machine=powerpc machine=powerpc/powerpc32 ;;
535 powerpc64) base_machine=powerpc machine=powerpc/powerpc64 ;;
536 s390) base_machine=s390 machine=s390/s390-32 ;;
537 s390x) base_machine=s390 machine=s390/s390-64 ;;
538 sh3*) base_machine=sh machine=sh/sh3 ;;
539 sh4*) base_machine=sh machine=sh/sh4 ;;
541 base_machine=sparc machine=sparc/sparc32 ;;
542 sparcv8 | supersparc | hypersparc)
543 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
544 sparcv8plus | sparcv8plusa | sparcv9)
545 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
546 sparcv8plusb | sparcv9b)
547 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
549 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
551 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
553 base_machine=sparc machine=sparc/sparc64 ;;
555 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
557 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
559 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
560 *) base_machine=$machine ;;
563 AC_SUBST(base_machine)
565 if test "$base_machine" = "i386"; then
566 AC_DEFINE(USE_REGPARMS)
569 # For the multi-arch option we need support in the assembler.
570 AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support],
571 libc_cv_asm_gnu_indirect_function, [dnl
572 cat > conftest.s <<EOF
573 .type foo,%gnu_indirect_function
575 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD;
577 libc_cv_asm_gnu_indirect_function=yes
579 libc_cv_asm_gnu_indirect_function=no
583 AC_MSG_CHECKING(whether .text pseudo-op must be used)
584 AC_CACHE_VAL(libc_cv_dot_text, [dnl
585 cat > conftest.s <<EOF
589 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
590 libc_cv_dot_text=.text
593 if test -z "$libc_cv_dot_text"; then
599 if test x"$libc_cv_asm_gnu_indirect_function" != xyes; then
600 if test x"$multi_arch" = xyes; then
601 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
606 if test x"$multi_arch" != xno; then
607 multi_arch_d=/multiarch
610 # Compute the list of sysdep directories for this configuration.
611 # This can take a while to compute.
612 sysdep_dir=$srcdir/sysdeps
613 AC_MSG_CHECKING(sysdep dirs)
614 dnl We need to use [ and ] for other purposes for a while now.
616 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
617 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
619 test "x$base_os" != x || case "$os" in
626 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
629 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
633 o=`echo $tail | sed 's/[0-9]*$//'`
634 if test $o != $tail; then
637 # For linux-gnu, try linux-gnu, then linux.
638 o=`echo $tail | sed 's/-.*$//'`
639 if test $o != $tail; then
643 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
646 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
652 # For sparc/sparc32, try sparc/sparc32 and then sparc.
654 tail=$machine${submachine:+/$submachine}
655 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
657 # Prepend the machine's FPU directory unless --without-fp.
658 if test "$with_fp" = yes; then
661 mach="$mach /$1/nofpu"
667 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
670 # Find what sysdep directories exist.
673 for b in $base ''; do
674 for m0 in $mach ''; do
675 for v in /$vendor ''; do
676 test "$v" = / && continue
677 for o in /$ostry ''; do
678 test "$o" = / && continue
679 for m in $multi_arch_d $mach ''; do
680 for d in $add_ons_pfx ''; do
681 for a in $add_ons_sfx ''; do
682 if test -n "$m0$m0sub$b$v$o$m$msub"; then
683 try_srcdir="${srcdir}/"
687 try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
688 test -n "$enable_debug_configure" &&
689 echo "$0 [DEBUG]: try $try" >&2
690 if test -d "$try_srcdir$try"; then
691 sysnames="$sysnames $try"
692 { test -n "$o" || test -n "$b"; } && os_used=t
693 { test -n "$m" || test -n "$m0"; } && machine_used=t
695 x*/$submachine) submachine_used=t ;;
697 if test -n "$d"; then
698 case "$sysnames_add_ons" in
700 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
713 # If the assembler supports gnu_indirect_function symbol type and the
714 # architecture supports multi-arch, we enable multi-arch by default.
715 case $sysnames_add_ons$sysnames in
719 test x"$multi_arch" = xdefault && multi_arch=no
722 if test x"$multi_arch" != xno; then
723 AC_DEFINE(USE_MULTIARCH)
727 if test -z "$os_used" && test "$os" != none; then
728 AC_MSG_ERROR(Operating system $os is not supported.)
730 if test -z "$machine_used" && test "$machine" != none; then
731 AC_MSG_ERROR(The $machine is not supported.)
733 if test -z "$submachine_used" && test -n "$submachine"; then
734 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
738 # We have now validated the configuration.
740 # Expand the list of system names into a full list of directories
741 # from each element's parent name and Implies file (if present).
744 while test $# -gt 0; do
748 case " $names " in *" $name "*)
749 # Already in the list.
753 # Report each name as we discover it, so there is no long pause in output.
754 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
756 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
760 *) xsrcdir=$srcdir/ ;;
762 test -n "$enable_debug_configure" &&
763 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
765 for implies_file in Implies Implies-before Implies-after; do
766 implies_type=`echo $implies_file | sed s/-/_/`
767 eval ${implies_type}=
768 if test -f $xsrcdir$name/$implies_file; then
769 # Collect more names from the `Implies' file (removing comments).
770 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
771 for x in $implied_candidate; do
773 if test -d $xsrcdir$name_base/$x; then
774 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
777 for d in $add_ons_pfx ''; do
781 *) try_srcdir=$srcdir/ ;;
783 test -n "$enable_debug_configure" &&
784 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
785 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
787 eval "${implies_type}=\"\$${implies_type} \$try\""
789 case "$sysnames_add_ons" in
791 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
795 if test $found = no; then
796 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
802 # Add NAME to the list of names.
805 # Find the parent of NAME, using the empty string if it has none.
807 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
810 test -n "$enable_debug_configure" &&
811 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
812 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
814 # Add the names implied by NAME, and NAME's parent (if it has one), to
815 # the list of names to be processed (the argument list). We prepend the
816 # implied names to the list and append the parent. We want implied
817 # directories to come before further directories inferred from the
818 # configuration components; this ensures that for sysv4, unix/common
819 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
821 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
822 test -n "$sysnames" && set $sysnames
825 # Add the default directories.
826 default_sysnames="sysdeps/generic"
827 sysnames="$names $default_sysnames"
829 # The other names were emitted during the scan.
830 AC_MSG_RESULT($default_sysnames)
832 # Collect the list of add-ons that supply partial sysdeps trees.
834 for add_on in $add_ons; do
837 *) xsrcdir="$srcdir/" ;;
840 test -d "$xsrcdir$add_on/sysdeps" || {
841 case "$configured_add_ons " in
844 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
850 sysdeps_add_ons="$sysdeps_add_ons $add_on"
851 case "$sysnames_add_ons" in
854 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
859 for d in $sysnames; do
861 $add_on/sysdeps/*) ;;
864 (cd "$xsrcdir$d" && for f in *[[!~]]; do
868 test -d "$ff" || { test -e "$ff" && exit 88; }
872 test -d "$f" || { test -e "$f" && exit 88; }
876 if test $? -eq 88; then
881 if test $found = no; then
882 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
885 AC_SUBST(sysdeps_add_ons)
891 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
892 # The makefiles need to use a different form to find it in $srcdir.
893 INSTALL='\$(..)./scripts/install-sh -c'
898 AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
900 # Accept binutils 2.20 or newer.
901 AC_CHECK_PROG_VER(AS, $AS, --version,
902 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
903 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
904 AC_CHECK_PROG_VER(LD, $LD, --version,
905 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
906 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
908 # These programs are version sensitive.
910 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
911 [version \([egcygnustpi-]*[0-9.]*\)], [4.[3-9].* | 4.[1-9][0-9].* | [5-9].* ],
912 critic_missing="$critic_missing gcc")
913 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
914 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
915 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
917 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
918 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
919 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
920 MSGFMT=: aux_missing="$aux_missing msgfmt")
921 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
922 [GNU texinfo.* \([0-9][0-9.]*\)],
923 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
924 MAKEINFO=: aux_missing="$aux_missing makeinfo")
925 AC_CHECK_PROG_VER(SED, sed, --version,
926 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
927 [3.0[2-9]*|3.[1-9]*|[4-9]*],
928 SED=: aux_missing="$aux_missing sed")
929 AC_CHECK_PROG_VER(AWK, gawk, --version,
930 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
931 [[3-9].*], critic_missing="$critic_missing gawk")
933 AC_CHECK_TOOL(READELF, readelf, false)
934 AC_CHECK_TOOL(NM, nm, false)
936 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
938 xno|x|x:) AUTOCONF=no ;;
941 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
942 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
943 libc_cv_autoconf_works=yes
945 libc_cv_autoconf_works=no
947 test $libc_cv_autoconf_works = yes || AUTOCONF=no
950 if test "x$AUTOCONF" = xno; then
951 aux_missing="$aux_missing autoconf"
954 test -n "$critic_missing" && AC_MSG_ERROR([
955 *** These critical programs are missing or too old:$critic_missing
956 *** Check the INSTALL file for required versions.])
958 test -n "$aux_missing" && AC_MSG_WARN([
959 *** These auxiliary programs are missing or incompatible versions:$aux_missing
960 *** some features will be disabled.
961 *** Check the INSTALL file for required versions.])
963 # if using special system headers, find out the compiler's sekrit
964 # header directory and add that to the list. NOTE: Only does the right
965 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
966 if test -n "$sysheaders"; then
967 SYSINCLUDES=-nostdinc
968 for d in include include-fixed; do
969 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
970 SYSINCLUDES="$SYSINCLUDES -isystem $i"
972 SYSINCLUDES="$SYSINCLUDES \
973 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
974 if test -n "$CXX"; then
976 cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
977 cxxheaders=`$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
978 | sed -n -e '1,/#include/d' -e '/^ \//{p;q;}' | sed 's/ //'`
979 test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
980 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
981 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
984 AC_SUBST(SYSINCLUDES)
985 AC_SUBST(CXX_SYSINCLUDES)
987 # Test if LD_LIBRARY_PATH contains the notation for the current directory
988 # since this would lead to problems installing/building glibc.
989 # LD_LIBRARY_PATH contains the current directory if one of the following
991 # - one of the terminals (":" and ";") is the first or last sign
992 # - two terminals occur directly after each other
993 # - the path contains an element with a dot in it
994 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
996 case ${LD_LIBRARY_PATH} in
997 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
998 ld_library_path_setting="contains current directory"
1001 ld_library_path_setting="ok"
1005 AC_MSG_RESULT($ld_library_path_setting)
1006 if test "$ld_library_path_setting" != "ok"; then
1008 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1009 *** building glibc. Please change the environment variable
1010 *** and run configure again.])
1013 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1014 if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
1015 libc_cv_gcc_static_libgcc=
1017 libc_cv_gcc_static_libgcc=-static-libgcc
1019 AC_SUBST(libc_cv_gcc_static_libgcc)
1021 AC_PATH_PROG(BASH_SHELL, bash, no)
1022 if test "$BASH_SHELL" != no &&
1023 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1024 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1025 libc_cv_have_bash2=yes
1027 libc_cv_have_bash2=no
1029 AC_SUBST(libc_cv_have_bash2)
1031 dnl We need a ksh compatible shell for tzselect.
1032 if test "$BASH_SHELL" = no; then
1033 AC_PATH_PROG(KSH, ksh, no)
1034 if test "$KSH" = no; then
1037 libc_cv_have_ksh=yes
1042 libc_cv_have_ksh=yes
1044 AC_SUBST(libc_cv_have_ksh)
1046 AC_PATH_PROG(PERL, perl, no)
1047 if test "$PERL" != no &&
1048 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1051 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1052 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1053 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1055 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1057 [#define __need_size_t
1058 #define __need_wchar_t
1061 #include <stddef.h>], [size_t size; wchar_t wchar;
1063 #error stddef.h ignored __need_*
1065 if (&size == NULL || &wchar == NULL) abort ();],
1066 libc_cv_friendly_stddef=yes,
1067 libc_cv_friendly_stddef=no)])
1068 if test $libc_cv_friendly_stddef = yes; then
1069 config_vars="$config_vars
1070 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1073 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1074 libc_cv_need_minus_P, [dnl
1075 cat > conftest.S <<EOF
1076 #include "confdefs.h"
1077 /* Nothing whatsoever. */
1079 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1080 libc_cv_need_minus_P=no
1082 libc_cv_need_minus_P=yes
1085 if test $libc_cv_need_minus_P = yes; then
1086 config_vars="$config_vars
1087 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1090 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1091 cat > conftest.s <<EOF
1094 .set glibc_conftest_frobozz,foo
1095 .globl glibc_conftest_frobozz
1097 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1098 # (but it doesn't work), so we must do a linking check to be sure.
1099 cat > conftest1.c <<\EOF
1100 extern int glibc_conftest_frobozz;
1101 void _start() { glibc_conftest_frobozz = 1; }
1103 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1104 -nostartfiles -nostdlib \
1105 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1106 libc_cv_asm_set_directive=yes
1108 libc_cv_asm_set_directive=no
1111 if test $libc_cv_asm_set_directive = yes; then
1112 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1115 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1116 libc_cv_asm_unique_object, [dnl
1117 cat > conftest.s <<EOF
1120 .type _sym, %gnu_unique_object
1122 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1123 libc_cv_asm_unique_object=yes
1125 libc_cv_asm_unique_object=no
1128 if test $libc_cv_asm_unique_object = yes; then
1129 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1132 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1133 [cat > conftest.s <<EOF
1136 .symver _sym,sym@VERS
1138 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1139 libc_cv_asm_symver_directive=yes
1141 libc_cv_asm_symver_directive=no
1144 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1145 if test $libc_cv_asm_symver_directive = yes; then
1146 cat > conftest.s <<EOF
1149 .symver _sym,sym@VERS
1151 cat > conftest.map <<EOF
1160 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1161 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1162 -o conftest.so conftest.o
1163 -nostartfiles -nostdlib
1164 -Wl,--version-script,conftest.map
1165 1>&AS_MESSAGE_LOG_FD]);
1167 libc_cv_ld_version_script_option=yes
1169 libc_cv_ld_version_script_option=no
1172 libc_cv_ld_version_script_option=no
1175 libc_cv_ld_version_script_option=no
1178 if test $shared != no &&
1179 test $libc_cv_asm_symver_directive = yes &&
1180 test $libc_cv_ld_version_script_option = yes &&
1181 test $enable_versioning = yes; then
1183 AC_DEFINE(DO_VERSIONING)
1187 AC_SUBST(VERSIONING)
1189 if test $shared != no && test $VERSIONING = no; then
1191 *** WARNING: You should not compile GNU libc without versioning. Not using
1192 *** versioning will introduce incompatibilities so that old binaries
1193 *** will not run anymore.
1194 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1196 AC_CACHE_CHECK(for .previous assembler directive,
1197 libc_cv_asm_previous_directive, [dnl
1198 cat > conftest.s <<EOF
1199 .section foo_section
1202 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1203 libc_cv_asm_previous_directive=yes
1205 libc_cv_asm_previous_directive=no
1208 if test $libc_cv_asm_previous_directive = yes; then
1209 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1211 AC_CACHE_CHECK(for .popsection assembler directive,
1212 libc_cv_asm_popsection_directive, [dnl
1213 cat > conftest.s <<EOF
1214 .pushsection foo_section
1217 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1218 libc_cv_asm_popsection_directive=yes
1220 libc_cv_asm_popsection_directive=no
1223 if test $libc_cv_asm_popsection_directive = yes; then
1224 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1227 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1228 libc_cv_asm_protected_directive, [dnl
1229 cat > conftest.s <<EOF
1235 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1236 libc_cv_asm_protected_directive=yes
1238 AC_MSG_ERROR(assembler support for symbol visibility is required)
1242 if test $libc_cv_asm_protected_directive = yes; then
1243 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1244 libc_cv_visibility_attribute,
1245 [cat > conftest.c <<EOF
1246 int foo __attribute__ ((visibility ("hidden"))) = 1;
1247 int bar __attribute__ ((visibility ("protected"))) = 1;
1249 libc_cv_visibility_attribute=no
1250 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1251 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1252 if grep '\.protected.*bar' conftest.s >/dev/null; then
1253 libc_cv_visibility_attribute=yes
1257 rm -f conftest.{c,s}
1259 if test $libc_cv_visibility_attribute != yes; then
1260 AC_MSG_ERROR(compiler support for visibility attribute is required)
1264 if test $libc_cv_visibility_attribute = yes; then
1265 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1266 libc_cv_broken_visibility_attribute,
1267 [cat > conftest.c <<EOF
1269 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1270 int bar (int x) { return x; }
1272 libc_cv_broken_visibility_attribute=yes
1273 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1275 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1277 libc_cv_broken_visibility_attribute=no
1280 rm -f conftest.c conftest.s
1282 if test $libc_cv_broken_visibility_attribute = yes; then
1283 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1287 AC_CACHE_CHECK(for broken __attribute__((alias())),
1288 libc_cv_broken_alias_attribute,
1289 [cat > conftest.c <<EOF
1290 extern int foo (int x) __asm ("xyzzy");
1291 int bar (int x) { return x; }
1292 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1294 extern __typeof (dfoo) dfoo __asm ("abccb");
1297 libc_cv_broken_alias_attribute=yes
1298 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1299 if grep 'xyzzy' conftest.s >/dev/null &&
1300 grep 'abccb' conftest.s >/dev/null; then
1301 libc_cv_broken_alias_attribute=no
1304 rm -f conftest.c conftest.s
1306 if test $libc_cv_broken_alias_attribute = yes; then
1307 AC_MSG_ERROR(working alias attribute support required)
1310 if test $libc_cv_visibility_attribute = yes; then
1311 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1312 libc_cv_have_sdata_section,
1313 [echo "int i;" > conftest.c
1314 libc_cv_have_sdata_section=no
1315 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1316 | grep '\.sdata' >/dev/null; then
1317 libc_cv_have_sdata_section=yes
1319 rm -f conftest.c conftest.so
1321 if test $libc_cv_have_sdata_section = yes; then
1322 AC_DEFINE(HAVE_SDATA_SECTION)
1326 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1327 libc_cv_initfini_array, [dnl
1328 LIBC_TRY_LINK_STATIC([
1329 int foo (void) { return 1; }
1330 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1332 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1333 libc_cv_initfini_array=yes
1335 libc_cv_initfini_array=no
1337 [libc_cv_initfini_array=no])
1339 if test $libc_cv_initfini_array != yes; then
1340 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1343 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1344 libc_cv_ctors_header, [dnl
1345 libc_cv_ctors_header=yes
1346 LIBC_TRY_LINK_STATIC([
1347 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1348 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1351 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1352 { gsub(/\@<:@ */, "@<:@") }
1353 $2 == ".ctors" || $2 == ".dtors" {
1354 size = strtonum("0x" $6)
1355 align = strtonum("0x" $NF)
1357 stub@<:@$2@:>@ = size == align * 2
1360 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1361 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1362 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1364 '], [libc_cv_ctors_header=no])
1366 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1369 if test $libc_cv_ctors_header = no; then
1370 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1373 AC_CACHE_CHECK(for libunwind-support in compiler,
1374 libc_cv_cc_with_libunwind, [
1375 cat > conftest.c <<EOF
1376 int main (void) { return 0; }
1378 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1379 conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
1380 libc_cv_cc_with_libunwind=yes
1382 libc_cv_cc_with_libunwind=no
1385 AC_SUBST(libc_cv_cc_with_libunwind)
1386 if test $libc_cv_cc_with_libunwind = yes; then
1387 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1390 AC_CACHE_CHECK(for -z nodelete option,
1391 libc_cv_z_nodelete, [dnl
1392 cat > conftest.c <<EOF
1393 int _start (void) { return 42; }
1395 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1396 -fPIC -shared -o conftest.so conftest.c
1397 -nostartfiles -nostdlib
1398 -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1400 libc_cv_z_nodelete=yes
1402 AC_MSG_ERROR(linker with -z nodelete support required)
1406 AC_CACHE_CHECK(for -z nodlopen option,
1407 libc_cv_z_nodlopen, [dnl
1408 cat > conftest.c <<EOF
1409 int _start (void) { return 42; }
1411 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1412 -fPIC -shared -o conftest.so conftest.c
1413 -nostartfiles -nostdlib
1414 -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1416 libc_cv_z_nodlopen=yes
1418 AC_MSG_ERROR(linker with -z nodlopen support required)
1422 AC_CACHE_CHECK(for -z initfirst option,
1423 libc_cv_z_initfirst, [dnl
1424 cat > conftest.c <<EOF
1425 int _start (void) { return 42; }
1427 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1428 -fPIC -shared -o conftest.so conftest.c
1429 -nostartfiles -nostdlib
1430 -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1432 libc_cv_z_initfirst=yes
1434 AC_MSG_ERROR(linker with -z initfirst support required)
1438 # Add-on fragments can set these for other machines.
1439 libc_commonpagesize=${libc_commonpagesize:-no}
1440 libc_relro_required=${libc_relro_required:-no}
1441 case "$base_machine" in
1442 i[[34567]]86 | x86_64 | powerpc* | s390*)
1443 libc_commonpagesize=0x1000
1444 libc_relro_required=yes
1447 libc_commonpagesize=0x2000
1448 libc_relro_required=yes
1452 if test $libc_commonpagesize != no; then
1453 AC_CACHE_CHECK(for -z relro option,
1454 libc_cv_z_relro, [dnl
1456 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1457 int _start (void) { return 42; }
1458 extern void _exit (int);
1459 /* Since these pointers are const, they should go in rodata.
1460 Since they refer to functions that have to be resolved by
1461 dynamic linking, they should instead go in RELRO data. */
1462 const void *const relro[] = { &_start, &_exit, 0 };
1463 /* GNU ld fails to produce RELRO data when it's very small and there is no
1464 normal writable data following it, or if only uninitialized (.bss) data
1465 follows it, or only very small writable data. */
1466 int data[0x10000] = { 1, };
1468 cat > conftest.awk <<\EOF
1471 commonpagesize = strtonum(commonpagesize)
1473 { print "LINE:", $0 > "/dev/stderr" }
1475 vaddr = strtonum($3)
1476 memsz = strtonum($6)
1478 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1479 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1480 result = (end % commonpagesize == 0) ? "yes" : "broken"
1482 END { print result }
1484 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1485 -fPIC -shared -o conftest.so conftest.c
1486 -nostartfiles -nostdlib
1487 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1488 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1490 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1491 conftest.ph > conftest.cps
1493 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1495 if { test "x$libc_relro_required" = xyes &&
1496 test "x$libc_cv_z_relro" != xyes
1499 AC_MSG_ERROR(linker with -z relro support required)
1502 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1505 AC_CACHE_CHECK(for -Bgroup option,
1506 libc_cv_Bgroup, [dnl
1507 cat > conftest.c <<EOF
1508 int _start (void) { return 42; }
1510 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1511 -fPIC -shared -o conftest.so conftest.c
1512 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1519 AC_SUBST(libc_cv_Bgroup)
1522 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1523 libc_cv_as_noexecstack, [dnl
1524 cat > conftest.c <<EOF
1527 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1528 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1529 && grep -q .note.GNU-stack conftest.s \
1530 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1531 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1533 libc_cv_as_noexecstack=yes
1535 libc_cv_as_noexecstack=no
1538 if test $libc_cv_as_noexecstack = yes; then
1539 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1541 AC_SUBST(ASFLAGS_config)
1543 AC_CACHE_CHECK(for -z combreloc,
1544 libc_cv_z_combreloc, [dnl
1545 cat > conftest.c <<EOF
1546 extern int bar (int);
1548 int foo (void) { return bar (mumble); }
1550 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1551 -fPIC -shared -o conftest.so conftest.c
1552 -nostdlib -nostartfiles
1553 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1555 dnl The following test is a bit weak. We must use a tool which can test
1556 dnl cross-platform since the gcc used can be a cross compiler. Without
1557 dnl introducing new options this is not easily doable. Instead use a tool
1558 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1559 dnl look for a section named .rel.dyn.
1560 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1561 libc_cv_z_combreloc=yes
1563 libc_cv_z_combreloc=no
1566 libc_cv_z_combreloc=no
1569 if test "$libc_cv_z_combreloc" = yes; then
1570 AC_DEFINE(HAVE_Z_COMBRELOC)
1572 AC_SUBST(libc_cv_z_combreloc)
1574 AC_CACHE_CHECK(for -z execstack,
1575 libc_cv_z_execstack, [dnl
1576 cat > conftest.c <<EOF
1577 int _start (void) { return 42; }
1579 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1580 -fPIC -shared -o conftest.so conftest.c
1581 -Wl,-z,execstack -nostdlib
1582 1>&AS_MESSAGE_LOG_FD])
1584 libc_cv_z_execstack=yes
1586 libc_cv_z_execstack=no
1589 AC_SUBST(libc_cv_z_execstack)
1591 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1592 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1595 AC_SUBST(libc_cv_fpie)
1597 AC_CACHE_CHECK(for --hash-style option,
1598 libc_cv_hashstyle, [dnl
1599 cat > conftest.c <<EOF
1600 int _start (void) { return 42; }
1602 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1603 -fPIC -shared -o conftest.so conftest.c
1604 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1606 libc_cv_hashstyle=yes
1608 libc_cv_hashstyle=no
1611 AC_SUBST(libc_cv_hashstyle)
1613 # The linker's default -shared behavior is good enough if it
1614 # does these things that our custom linker scripts ensure that
1615 # all allocated NOTE sections come first.
1616 if test "$use_default_link" = default; then
1617 AC_CACHE_CHECK([for sufficient default -shared layout],
1618 libc_cv_use_default_link, [dnl
1619 libc_cv_use_default_link=no
1620 cat > conftest.s <<\EOF
1621 .section .note.a,"a",%note
1626 .section .note.b,"a",%note
1632 if AC_TRY_COMMAND([dnl
1633 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1634 ac_try=`$READELF -S conftest.so | sed -n \
1636 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1642 libc_seen_a=no libc_seen_b=no
1644 while test $# -ge 2 -a "$1" = NOTE; do
1646 .note.a) libc_seen_a=yes ;;
1647 .note.b) libc_seen_b=yes ;;
1651 case "$libc_seen_a$libc_seen_b" in
1653 libc_cv_use_default_link=yes
1656 echo >&AS_MESSAGE_LOG_FD "\
1657 $libc_seen_a$libc_seen_b from:
1663 use_default_link=$libc_cv_use_default_link
1666 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1667 if libc_cv_output_format=`
1668 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1672 libc_cv_output_format=
1674 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1675 AC_SUBST(libc_cv_output_format)
1677 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1678 cat > conftest.c <<EOF
1681 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1682 conftest.c 1>&AS_MESSAGE_LOG_FD])
1684 libc_cv_fno_toplevel_reorder=yes
1686 libc_cv_fno_toplevel_reorder=no
1689 if test $libc_cv_fno_toplevel_reorder = yes; then
1690 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1692 fno_unit_at_a_time=-fno-unit-at-a-time
1694 AC_SUBST(fno_unit_at_a_time)
1696 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1697 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1701 AC_SUBST(libc_cv_ssp)
1703 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1704 cat > conftest.c <<EOF
1706 #ifdef __GNUC_GNU_INLINE__
1707 main () { return 0;}
1712 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1713 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1715 libc_cv_gnu89_inline=yes
1717 libc_cv_gnu89_inline=no
1720 if test $libc_cv_gnu89_inline = yes; then
1721 gnu89_inline=-fgnu89-inline
1725 AC_SUBST(gnu89_inline)
1727 AC_CACHE_CHECK(whether cc puts quotes around section names,
1728 libc_cv_have_section_quotes,
1729 [cat > conftest.c <<EOF
1730 static const int foo
1731 __attribute__ ((section ("bar"))) = 1;
1733 if ${CC-cc} -S conftest.c -o conftest.s; then
1734 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1735 libc_cv_have_section_quotes=yes
1737 libc_cv_have_section_quotes=no
1740 libc_cv_have_section_quotes=unknown
1742 rm -f conftest.{c,s}
1744 if test $libc_cv_have_section_quotes = yes; then
1745 AC_DEFINE(HAVE_SECTION_QUOTES)
1748 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1750 cat > conftest.s <<EOF
1755 .weak bar; bar = foo
1757 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1758 libc_cv_asm_weak_directive=yes
1760 libc_cv_asm_weak_directive=no
1764 if test $libc_cv_asm_weak_directive = no; then
1765 AC_CACHE_CHECK(for assembler .weakext directive,
1766 libc_cv_asm_weakext_directive,
1768 cat > conftest.s <<EOF
1777 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1778 libc_cv_asm_weakext_directive=yes
1780 libc_cv_asm_weakext_directive=no
1786 if test $libc_cv_asm_weak_directive = yes; then
1787 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1788 elif test $libc_cv_asm_weakext_directive = yes; then
1789 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1792 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1794 sparc/sparc64*) cfi_offset=2047;;
1797 cat > conftest.s <<EOF
1799 .type func,%function
1803 .cfi_rel_offset 1, $cfi_offset
1806 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1807 libc_cv_asm_cfi_directives=yes
1809 libc_cv_asm_cfi_directives=no
1812 if test $libc_cv_asm_cfi_directives = yes; then
1813 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1816 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1817 cat > conftest.c <<\EOF
1822 dnl No \ in command here because it ends up inside ''.
1823 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1824 -nostdlib -nostartfiles -Wl,--no-whole-archive
1825 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1826 libc_cv_ld_no_whole_archive=yes
1828 libc_cv_ld_no_whole_archive=no
1831 if test $libc_cv_ld_no_whole_archive = no; then
1832 AC_MSG_ERROR([support for --no-whole-archive is needed])
1835 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1836 cat > conftest.c <<\EOF
1841 dnl No \ in command here because it ends up inside ''.
1842 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1843 -nostdlib -nostartfiles -fexceptions
1844 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1845 libc_cv_gcc_exceptions=yes
1847 libc_cv_gcc_exceptions=no
1850 if test $libc_cv_gcc_exceptions = yes; then
1851 exceptions=-fexceptions
1853 AC_SUBST(exceptions)dnl
1855 if test "$host_cpu" = powerpc ; then
1856 # Check for a bug present in at least versions 2.8.x of GCC
1857 # and versions 1.0.x of EGCS.
1858 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1859 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1860 libc_cv_c_asmcr0_bug='no',
1861 libc_cv_c_asmcr0_bug='yes')])
1862 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1863 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1867 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1868 cat > conftest.c <<\EOF
1871 __builtin_memset (x, 0, 1000);
1875 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1877 libc_cv_gcc_builtin_memset=no
1879 libc_cv_gcc_builtin_memset=yes
1882 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1883 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1886 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1887 cat > conftest.c <<\EOF
1888 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1889 char *foo (const char *a, const char *b)
1891 return __builtin_strstr (a, b);
1895 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1897 libc_cv_gcc_builtin_redirection=yes
1899 libc_cv_gcc_builtin_redirection=no
1902 if test "$libc_cv_gcc_builtin_redirection" = no; then
1903 AC_MSG_ERROR([support for the symbol redirection needed])
1906 dnl Check whether the compiler supports the __thread keyword.
1907 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1908 [cat > conftest.c <<\EOF
1909 __thread int a = 42;
1911 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1912 libc_cv_gcc___thread=yes
1914 libc_cv_gcc___thread=no
1917 if test "$libc_cv_gcc___thread" = no; then
1918 AC_MSG_ERROR([support for the __thread keyword is required])
1921 dnl Check whether the compiler supports the tls_model attribute.
1922 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1923 cat > conftest.c <<\EOF
1924 extern __thread int a __attribute__((tls_model ("initial-exec")));
1926 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1927 libc_cv_gcc_tls_model_attr=yes
1929 libc_cv_gcc_tls_model_attr=no
1932 if test "$libc_cv_gcc_tls_model_attr" = no; then
1933 AC_MSG_ERROR([support for the tls_model attribute is required])
1936 dnl Determine how to disable generation of FMA instructions.
1937 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1938 libc_cv_cc_nofma, [dnl
1940 for opt in -ffp-contract=off -mno-fused-madd; do
1941 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1944 if test -n "$submachine"; then
1945 AC_CACHE_CHECK([for compiler option for CPU variant],
1946 libc_cv_cc_submachine, [dnl
1947 libc_cv_cc_submachine=no
1948 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1949 LIBC_TRY_CC_OPTION([$opt], [
1950 libc_cv_cc_submachine="$opt"
1953 if test "x$libc_cv_cc_submachine" = xno; then
1954 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1957 AC_SUBST(libc_cv_cc_submachine)
1959 dnl Check whether we have the gd library available.
1960 AC_MSG_CHECKING(for libgd)
1961 if test "$with_gd" != "no"; then
1962 old_CFLAGS="$CFLAGS"
1963 CFLAGS="$CFLAGS $libgd_include"
1964 old_LDFLAGS="$LDFLAGS"
1965 LDFLAGS="$LDFLAGS $libgd_ldflags"
1967 LIBS="$LIBS -lgd -lpng -lz -lm"
1968 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1969 CFLAGS="$old_CFLAGS"
1970 LDFLAGS="$old_LDFLAGS"
1975 AC_MSG_RESULT($LIBGD)
1979 if test x$with_selinux = xno ; then
1982 # See if we have the SELinux library
1983 AC_CHECK_LIB(selinux, is_selinux_enabled,
1984 have_selinux=yes, have_selinux=no)
1985 # See if we have the SELinux header with the NSCD permissions in it.
1986 if test x$have_selinux = xyes ; then
1987 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1988 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1989 [#ifdef NSCD__SHMEMHOST
1992 #error NSCD__SHMEMHOST not defined
1994 have_selinux=yes, have_selinux=no)
1995 AC_MSG_RESULT($have_selinux)
1998 if test x$with_selinux = xyes ; then
1999 if test x$have_selinux = xno ; then
2000 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
2004 # Check if we're building with SELinux support.
2005 if test "x$have_selinux" = xyes; then
2006 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
2008 # See if we have the libaudit library
2009 AC_CHECK_LIB(audit, audit_log_user_avc_message,
2010 have_libaudit=yes, have_libaudit=no)
2011 if test "x$have_libaudit" = xyes; then
2012 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2014 AC_SUBST(have_libaudit)
2016 # See if we have the libcap library
2017 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2018 if test "x$have_libcap" = xyes; then
2019 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2021 AC_SUBST(have_libcap)
2023 AC_SUBST(have_selinux)
2025 dnl check for the size of 'long double'.
2026 AC_CHECK_SIZEOF(long double, 0)
2027 sizeof_long_double=$ac_cv_sizeof_long_double
2028 AC_SUBST(sizeof_long_double)
2031 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2032 dnl Since we are building the implementations of the fortified functions here,
2033 dnl having the macro defined interacts very badly.
2034 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2035 [AC_TRY_COMPILE([], [
2036 #ifdef _FORTIFY_SOURCE
2039 [libc_cv_predef_fortify_source=no],
2040 [libc_cv_predef_fortify_source=yes])])
2041 if test $libc_cv_predef_fortify_source = yes; then
2042 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2046 dnl Check for silly hacked compilers inserting -fstack-protector.
2047 dnl This breaks badly for the early startup code we compile, since
2048 dnl the compiled code can refer to a magic machine-dependent location
2049 dnl for the canary value before we have sufficient setup for that to
2050 dnl work. It's also questionable to build all of libc with this flag
2051 dnl even when you're doing that for most applications you build, since
2052 dnl libc's code is so heavily-used and performance-sensitive. If we
2053 dnl ever really want to make that work, it should be enabled explicitly
2054 dnl in the libc build, not inherited from implicit compiler settings.
2055 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2056 libc_cv_predef_stack_protector, [
2057 AC_TRY_COMPILE([extern void foobar (char *);],
2058 [char large_array[2048]; foobar (large_array);], [
2059 libc_undefs=`$NM -u conftest.o |
2060 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2061 2>&AS_MESSAGE_LOG_FD` || {
2062 AC_MSG_ERROR([confusing output from $NM -u])
2064 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2065 # On some architectures, there are architecture-specific undefined
2066 # symbols (resolved by the linker), so filter out unknown symbols.
2067 # This will fail to produce the correct result if the compiler
2068 # defaults to -fstack-protector but this produces an undefined symbol
2069 # other than __stack_chk_fail. However, compilers like that have not
2070 # been encountered in practice.
2071 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2072 case "$libc_undefs" in
2073 foobar) libc_cv_predef_stack_protector=no ;;
2075 foobar') libc_cv_predef_stack_protector=yes ;;
2076 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2078 [AC_MSG_ERROR([test compilation failed])])
2081 if test $libc_cv_predef_stack_protector = yes; then
2082 libc_extra_cflags=-fno-stack-protector
2084 AC_SUBST(libc_extra_cflags)
2086 ### End of automated tests.
2087 ### Now run sysdeps configure fragments.
2089 # They also can set these variables.
2091 ldd_rewrite_script=no
2092 libc_cv_sysconfdir=$sysconfdir
2093 libc_cv_localstatedir=$localstatedir
2094 libc_cv_gcc_unwind_find_fde=no
2097 # Iterate over all the sysdep directories we will use, running their
2098 # configure fragments.
2099 for dir in $sysnames; do
2102 *) dest=$srcdir/$dir ;;
2104 if test -r $dest/configure; then
2105 AC_MSG_RESULT(running configure fragment for $dir)
2110 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2111 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2113 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2115 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2116 # configure fragment can override the value to prevent this AC_DEFINE.
2118 if test "x$use_nscd" != xno; then
2119 AC_DEFINE([USE_NSCD])
2121 if test "x$build_nscd" = xdefault; then
2122 build_nscd=$use_nscd
2125 # Test for old glibc 2.0.x headers so that they can be removed properly
2126 # Search only in includedir.
2127 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2128 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2130 old_glibc_headers=yes
2132 old_glibc_headers=no
2134 AC_MSG_RESULT($old_glibc_headers)
2135 if test ${old_glibc_headers} = yes; then
2136 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2137 AC_MSG_WARN(*** be removed.)
2139 AC_SUBST(old_glibc_headers)
2141 AC_SUBST(libc_cv_slibdir)
2142 AC_SUBST(libc_cv_localedir)
2143 AC_SUBST(libc_cv_sysconfdir)
2144 AC_SUBST(libc_cv_localstatedir)
2145 AC_SUBST(libc_cv_rootsbindir)
2146 AC_SUBST(libc_cv_forced_unwind)
2148 dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
2149 AC_SUBST(libc_cv_cc_sse4)
2150 AC_SUBST(libc_cv_cc_avx)
2151 AC_SUBST(libc_cv_cc_sse2avx)
2152 AC_SUBST(libc_cv_cc_novzeroupper)
2153 AC_SUBST(libc_cv_cc_fma4)
2154 AC_SUBST(libc_cv_cc_nofma)
2155 AC_SUBST(libc_cv_as_i686)
2156 AC_SUBST(libc_cv_sparc_as_vis3)
2158 if test x$use_ldconfig = xyes; then
2159 AC_DEFINE(USE_LDCONFIG)
2161 AC_SUBST(use_ldconfig)
2162 AC_SUBST(ldd_rewrite_script)
2167 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2168 [libc_cv_pic_default=yes
2169 cat > conftest.c <<EOF
2170 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2171 # error PIC is default.
2174 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2175 libc_cv_pic_default=no
2178 AC_SUBST(libc_cv_pic_default)
2181 AC_SUBST(static_nss)
2185 dnl See sysdeps/mach/configure.in for this variable.
2186 AC_SUBST(mach_interface_list)
2188 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2189 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2193 AC_CONFIG_FILES([config.make Makefile])
2194 AC_CONFIG_COMMANDS([default],[[
2195 case $CONFIG_FILES in *config.make*)
2196 echo "$config_vars" >> config.make;;
2198 test -d bits || mkdir bits]],[[config_vars='$config_vars']])