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 cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
977 cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
978 cxxplus=`$CXX -print-prog-name=cc1plus`
979 cxxheaders=`$cxxplus -v /dev/null 2>&1 | sed -n '/ \//{p;q;}' | sed 's/ //'`
980 test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
981 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
982 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
985 AC_SUBST(SYSINCLUDES)
986 AC_SUBST(CXX_SYSINCLUDES)
988 # Test if LD_LIBRARY_PATH contains the notation for the current directory
989 # since this would lead to problems installing/building glibc.
990 # LD_LIBRARY_PATH contains the current directory if one of the following
992 # - one of the terminals (":" and ";") is the first or last sign
993 # - two terminals occur directly after each other
994 # - the path contains an element with a dot in it
995 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
997 case ${LD_LIBRARY_PATH} in
998 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
999 ld_library_path_setting="contains current directory"
1002 ld_library_path_setting="ok"
1006 AC_MSG_RESULT($ld_library_path_setting)
1007 if test "$ld_library_path_setting" != "ok"; then
1009 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1010 *** building glibc. Please change the environment variable
1011 *** and run configure again.])
1014 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1015 if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
1016 libc_cv_gcc_static_libgcc=
1018 libc_cv_gcc_static_libgcc=-static-libgcc
1020 AC_SUBST(libc_cv_gcc_static_libgcc)
1022 AC_PATH_PROG(BASH_SHELL, bash, no)
1023 if test "$BASH_SHELL" != no &&
1024 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1025 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1026 libc_cv_have_bash2=yes
1028 libc_cv_have_bash2=no
1030 AC_SUBST(libc_cv_have_bash2)
1032 dnl We need a ksh compatible shell for tzselect.
1033 if test "$BASH_SHELL" = no; then
1034 AC_PATH_PROG(KSH, ksh, no)
1035 if test "$KSH" = no; then
1038 libc_cv_have_ksh=yes
1043 libc_cv_have_ksh=yes
1045 AC_SUBST(libc_cv_have_ksh)
1047 AC_PATH_PROG(PERL, perl, no)
1048 if test "$PERL" != no &&
1049 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1052 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1053 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1054 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1056 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1058 [#define __need_size_t
1059 #define __need_wchar_t
1062 #include <stddef.h>], [size_t size; wchar_t wchar;
1064 #error stddef.h ignored __need_*
1066 if (&size == NULL || &wchar == NULL) abort ();],
1067 libc_cv_friendly_stddef=yes,
1068 libc_cv_friendly_stddef=no)])
1069 if test $libc_cv_friendly_stddef = yes; then
1070 config_vars="$config_vars
1071 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1074 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1075 libc_cv_need_minus_P, [dnl
1076 cat > conftest.S <<EOF
1077 #include "confdefs.h"
1078 /* Nothing whatsoever. */
1080 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1081 libc_cv_need_minus_P=no
1083 libc_cv_need_minus_P=yes
1086 if test $libc_cv_need_minus_P = yes; then
1087 config_vars="$config_vars
1088 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1091 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1092 cat > conftest.s <<EOF
1095 .set glibc_conftest_frobozz,foo
1096 .globl glibc_conftest_frobozz
1098 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1099 # (but it doesn't work), so we must do a linking check to be sure.
1100 cat > conftest1.c <<\EOF
1101 extern int glibc_conftest_frobozz;
1102 void _start() { glibc_conftest_frobozz = 1; }
1104 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1105 -nostartfiles -nostdlib \
1106 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1107 libc_cv_asm_set_directive=yes
1109 libc_cv_asm_set_directive=no
1112 if test $libc_cv_asm_set_directive = yes; then
1113 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1116 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1117 libc_cv_asm_unique_object, [dnl
1118 cat > conftest.s <<EOF
1121 .type _sym, %gnu_unique_object
1123 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1124 libc_cv_asm_unique_object=yes
1126 libc_cv_asm_unique_object=no
1129 if test $libc_cv_asm_unique_object = yes; then
1130 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1133 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1134 [cat > conftest.s <<EOF
1137 .symver _sym,sym@VERS
1139 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1140 libc_cv_asm_symver_directive=yes
1142 libc_cv_asm_symver_directive=no
1145 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1146 if test $libc_cv_asm_symver_directive = yes; then
1147 cat > conftest.s <<EOF
1150 .symver _sym,sym@VERS
1152 cat > conftest.map <<EOF
1161 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1162 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1163 -o conftest.so conftest.o
1164 -nostartfiles -nostdlib
1165 -Wl,--version-script,conftest.map
1166 1>&AS_MESSAGE_LOG_FD]);
1168 libc_cv_ld_version_script_option=yes
1170 libc_cv_ld_version_script_option=no
1173 libc_cv_ld_version_script_option=no
1176 libc_cv_ld_version_script_option=no
1179 if test $shared != no &&
1180 test $libc_cv_asm_symver_directive = yes &&
1181 test $libc_cv_ld_version_script_option = yes &&
1182 test $enable_versioning = yes; then
1184 AC_DEFINE(DO_VERSIONING)
1188 AC_SUBST(VERSIONING)
1190 if test $shared != no && test $VERSIONING = no; then
1192 *** WARNING: You should not compile GNU libc without versioning. Not using
1193 *** versioning will introduce incompatibilities so that old binaries
1194 *** will not run anymore.
1195 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1197 AC_CACHE_CHECK(for .previous assembler directive,
1198 libc_cv_asm_previous_directive, [dnl
1199 cat > conftest.s <<EOF
1200 .section foo_section
1203 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1204 libc_cv_asm_previous_directive=yes
1206 libc_cv_asm_previous_directive=no
1209 if test $libc_cv_asm_previous_directive = yes; then
1210 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1212 AC_CACHE_CHECK(for .popsection assembler directive,
1213 libc_cv_asm_popsection_directive, [dnl
1214 cat > conftest.s <<EOF
1215 .pushsection foo_section
1218 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1219 libc_cv_asm_popsection_directive=yes
1221 libc_cv_asm_popsection_directive=no
1224 if test $libc_cv_asm_popsection_directive = yes; then
1225 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1228 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1229 libc_cv_asm_protected_directive, [dnl
1230 cat > conftest.s <<EOF
1236 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1237 libc_cv_asm_protected_directive=yes
1239 AC_MSG_ERROR(assembler support for symbol visibility is required)
1243 if test $libc_cv_asm_protected_directive = yes; then
1244 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1245 libc_cv_visibility_attribute,
1246 [cat > conftest.c <<EOF
1247 int foo __attribute__ ((visibility ("hidden"))) = 1;
1248 int bar __attribute__ ((visibility ("protected"))) = 1;
1250 libc_cv_visibility_attribute=no
1251 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1252 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1253 if grep '\.protected.*bar' conftest.s >/dev/null; then
1254 libc_cv_visibility_attribute=yes
1258 rm -f conftest.{c,s}
1260 if test $libc_cv_visibility_attribute != yes; then
1261 AC_MSG_ERROR(compiler support for visibility attribute is required)
1265 if test $libc_cv_visibility_attribute = yes; then
1266 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1267 libc_cv_broken_visibility_attribute,
1268 [cat > conftest.c <<EOF
1270 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1271 int bar (int x) { return x; }
1273 libc_cv_broken_visibility_attribute=yes
1274 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1276 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1278 libc_cv_broken_visibility_attribute=no
1281 rm -f conftest.c conftest.s
1283 if test $libc_cv_broken_visibility_attribute = yes; then
1284 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1288 AC_CACHE_CHECK(for broken __attribute__((alias())),
1289 libc_cv_broken_alias_attribute,
1290 [cat > conftest.c <<EOF
1291 extern int foo (int x) __asm ("xyzzy");
1292 int bar (int x) { return x; }
1293 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1295 extern __typeof (dfoo) dfoo __asm ("abccb");
1298 libc_cv_broken_alias_attribute=yes
1299 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1300 if grep 'xyzzy' conftest.s >/dev/null &&
1301 grep 'abccb' conftest.s >/dev/null; then
1302 libc_cv_broken_alias_attribute=no
1305 rm -f conftest.c conftest.s
1307 if test $libc_cv_broken_alias_attribute = yes; then
1308 AC_MSG_ERROR(working alias attribute support required)
1311 if test $libc_cv_visibility_attribute = yes; then
1312 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1313 libc_cv_have_sdata_section,
1314 [echo "int i;" > conftest.c
1315 libc_cv_have_sdata_section=no
1316 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1317 | grep '\.sdata' >/dev/null; then
1318 libc_cv_have_sdata_section=yes
1320 rm -f conftest.c conftest.so
1322 if test $libc_cv_have_sdata_section = yes; then
1323 AC_DEFINE(HAVE_SDATA_SECTION)
1327 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1328 libc_cv_initfini_array, [dnl
1329 LIBC_TRY_LINK_STATIC([
1330 int foo (void) { return 1; }
1331 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1333 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1334 libc_cv_initfini_array=yes
1336 libc_cv_initfini_array=no
1338 [libc_cv_initfini_array=no])
1340 if test $libc_cv_initfini_array != yes; then
1341 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1344 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1345 libc_cv_ctors_header, [dnl
1346 libc_cv_ctors_header=yes
1347 LIBC_TRY_LINK_STATIC([
1348 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1349 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1352 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1353 { gsub(/\@<:@ */, "@<:@") }
1354 $2 == ".ctors" || $2 == ".dtors" {
1355 size = strtonum("0x" $6)
1356 align = strtonum("0x" $NF)
1358 stub@<:@$2@:>@ = size == align * 2
1361 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1362 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1363 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1365 '], [libc_cv_ctors_header=no])
1367 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1370 if test $libc_cv_ctors_header = no; then
1371 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1374 AC_CACHE_CHECK(for libunwind-support in compiler,
1375 libc_cv_cc_with_libunwind, [
1376 cat > conftest.c <<EOF
1377 int main (void) { return 0; }
1379 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1380 conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
1381 libc_cv_cc_with_libunwind=yes
1383 libc_cv_cc_with_libunwind=no
1386 AC_SUBST(libc_cv_cc_with_libunwind)
1387 if test $libc_cv_cc_with_libunwind = yes; then
1388 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1391 AC_CACHE_CHECK(for -z nodelete option,
1392 libc_cv_z_nodelete, [dnl
1393 cat > conftest.c <<EOF
1394 int _start (void) { return 42; }
1396 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1397 -fPIC -shared -o conftest.so conftest.c
1398 -nostartfiles -nostdlib
1399 -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1401 libc_cv_z_nodelete=yes
1403 AC_MSG_ERROR(linker with -z nodelete support required)
1407 AC_CACHE_CHECK(for -z nodlopen option,
1408 libc_cv_z_nodlopen, [dnl
1409 cat > conftest.c <<EOF
1410 int _start (void) { return 42; }
1412 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1413 -fPIC -shared -o conftest.so conftest.c
1414 -nostartfiles -nostdlib
1415 -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1417 libc_cv_z_nodlopen=yes
1419 AC_MSG_ERROR(linker with -z nodlopen support required)
1423 AC_CACHE_CHECK(for -z initfirst option,
1424 libc_cv_z_initfirst, [dnl
1425 cat > conftest.c <<EOF
1426 int _start (void) { return 42; }
1428 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1429 -fPIC -shared -o conftest.so conftest.c
1430 -nostartfiles -nostdlib
1431 -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1433 libc_cv_z_initfirst=yes
1435 AC_MSG_ERROR(linker with -z initfirst support required)
1439 # Add-on fragments can set these for other machines.
1440 libc_commonpagesize=${libc_commonpagesize:-no}
1441 libc_relro_required=${libc_relro_required:-no}
1442 case "$base_machine" in
1443 i[[34567]]86 | x86_64 | powerpc* | s390*)
1444 libc_commonpagesize=0x1000
1445 libc_relro_required=yes
1448 libc_commonpagesize=0x2000
1449 libc_relro_required=yes
1453 if test $libc_commonpagesize != no; then
1454 AC_CACHE_CHECK(for -z relro option,
1455 libc_cv_z_relro, [dnl
1457 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1458 int _start (void) { return 42; }
1459 extern void _exit (int);
1460 /* Since these pointers are const, they should go in rodata.
1461 Since they refer to functions that have to be resolved by
1462 dynamic linking, they should instead go in RELRO data. */
1463 const void *const relro[] = { &_start, &_exit, 0 };
1464 /* GNU ld fails to produce RELRO data when it's very small and there is no
1465 normal writable data following it, or if only uninitialized (.bss) data
1466 follows it, or only very small writable data. */
1467 int data[0x10000] = { 1, };
1469 cat > conftest.awk <<\EOF
1472 commonpagesize = strtonum(commonpagesize)
1474 { print "LINE:", $0 > "/dev/stderr" }
1476 vaddr = strtonum($3)
1477 memsz = strtonum($6)
1479 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1480 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1481 result = (end % commonpagesize == 0) ? "yes" : "broken"
1483 END { print result }
1485 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1486 -fPIC -shared -o conftest.so conftest.c
1487 -nostartfiles -nostdlib
1488 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1489 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1491 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1492 conftest.ph > conftest.cps
1494 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1496 if { test "x$libc_relro_required" = xyes &&
1497 test "x$libc_cv_z_relro" != xyes
1500 AC_MSG_ERROR(linker with -z relro support required)
1503 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1506 AC_CACHE_CHECK(for -Bgroup option,
1507 libc_cv_Bgroup, [dnl
1508 cat > conftest.c <<EOF
1509 int _start (void) { return 42; }
1511 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1512 -fPIC -shared -o conftest.so conftest.c
1513 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1520 AC_SUBST(libc_cv_Bgroup)
1523 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1524 libc_cv_as_noexecstack, [dnl
1525 cat > conftest.c <<EOF
1528 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1529 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1530 && grep -q .note.GNU-stack conftest.s \
1531 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1532 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1534 libc_cv_as_noexecstack=yes
1536 libc_cv_as_noexecstack=no
1539 if test $libc_cv_as_noexecstack = yes; then
1540 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1542 AC_SUBST(ASFLAGS_config)
1544 AC_CACHE_CHECK(for -z combreloc,
1545 libc_cv_z_combreloc, [dnl
1546 cat > conftest.c <<EOF
1547 extern int bar (int);
1549 int foo (void) { return bar (mumble); }
1551 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1552 -fPIC -shared -o conftest.so conftest.c
1553 -nostdlib -nostartfiles
1554 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1556 dnl The following test is a bit weak. We must use a tool which can test
1557 dnl cross-platform since the gcc used can be a cross compiler. Without
1558 dnl introducing new options this is not easily doable. Instead use a tool
1559 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1560 dnl look for a section named .rel.dyn.
1561 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1562 libc_cv_z_combreloc=yes
1564 libc_cv_z_combreloc=no
1567 libc_cv_z_combreloc=no
1570 if test "$libc_cv_z_combreloc" = yes; then
1571 AC_DEFINE(HAVE_Z_COMBRELOC)
1573 AC_SUBST(libc_cv_z_combreloc)
1575 AC_CACHE_CHECK(for -z execstack,
1576 libc_cv_z_execstack, [dnl
1577 cat > conftest.c <<EOF
1578 int _start (void) { return 42; }
1580 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1581 -fPIC -shared -o conftest.so conftest.c
1582 -Wl,-z,execstack -nostdlib
1583 1>&AS_MESSAGE_LOG_FD])
1585 libc_cv_z_execstack=yes
1587 libc_cv_z_execstack=no
1590 AC_SUBST(libc_cv_z_execstack)
1592 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1593 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1596 AC_SUBST(libc_cv_fpie)
1598 AC_CACHE_CHECK(for --hash-style option,
1599 libc_cv_hashstyle, [dnl
1600 cat > conftest.c <<EOF
1601 int _start (void) { return 42; }
1603 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1604 -fPIC -shared -o conftest.so conftest.c
1605 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1607 libc_cv_hashstyle=yes
1609 libc_cv_hashstyle=no
1612 AC_SUBST(libc_cv_hashstyle)
1614 # The linker's default -shared behavior is good enough if it
1615 # does these things that our custom linker scripts ensure that
1616 # all allocated NOTE sections come first.
1617 if test "$use_default_link" = default; then
1618 AC_CACHE_CHECK([for sufficient default -shared layout],
1619 libc_cv_use_default_link, [dnl
1620 libc_cv_use_default_link=no
1621 cat > conftest.s <<\EOF
1622 .section .note.a,"a",%note
1627 .section .note.b,"a",%note
1633 if AC_TRY_COMMAND([dnl
1634 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1635 ac_try=`$READELF -S conftest.so | sed -n \
1637 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1643 libc_seen_a=no libc_seen_b=no
1645 while test $# -ge 2 -a "$1" = NOTE; do
1647 .note.a) libc_seen_a=yes ;;
1648 .note.b) libc_seen_b=yes ;;
1652 case "$libc_seen_a$libc_seen_b" in
1654 libc_cv_use_default_link=yes
1657 echo >&AS_MESSAGE_LOG_FD "\
1658 $libc_seen_a$libc_seen_b from:
1664 use_default_link=$libc_cv_use_default_link
1667 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1668 if libc_cv_output_format=`
1669 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1673 libc_cv_output_format=
1675 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1676 AC_SUBST(libc_cv_output_format)
1678 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1679 cat > conftest.c <<EOF
1682 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1683 conftest.c 1>&AS_MESSAGE_LOG_FD])
1685 libc_cv_fno_toplevel_reorder=yes
1687 libc_cv_fno_toplevel_reorder=no
1690 if test $libc_cv_fno_toplevel_reorder = yes; then
1691 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1693 fno_unit_at_a_time=-fno-unit-at-a-time
1695 AC_SUBST(fno_unit_at_a_time)
1697 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1698 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1702 AC_SUBST(libc_cv_ssp)
1704 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1705 cat > conftest.c <<EOF
1707 #ifdef __GNUC_GNU_INLINE__
1708 main () { return 0;}
1713 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1714 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1716 libc_cv_gnu89_inline=yes
1718 libc_cv_gnu89_inline=no
1721 if test $libc_cv_gnu89_inline = yes; then
1722 gnu89_inline=-fgnu89-inline
1726 AC_SUBST(gnu89_inline)
1728 AC_CACHE_CHECK(whether cc puts quotes around section names,
1729 libc_cv_have_section_quotes,
1730 [cat > conftest.c <<EOF
1731 static const int foo
1732 __attribute__ ((section ("bar"))) = 1;
1734 if ${CC-cc} -S conftest.c -o conftest.s; then
1735 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1736 libc_cv_have_section_quotes=yes
1738 libc_cv_have_section_quotes=no
1741 libc_cv_have_section_quotes=unknown
1743 rm -f conftest.{c,s}
1745 if test $libc_cv_have_section_quotes = yes; then
1746 AC_DEFINE(HAVE_SECTION_QUOTES)
1749 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1751 cat > conftest.s <<EOF
1756 .weak bar; bar = foo
1758 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1759 libc_cv_asm_weak_directive=yes
1761 libc_cv_asm_weak_directive=no
1765 if test $libc_cv_asm_weak_directive = no; then
1766 AC_CACHE_CHECK(for assembler .weakext directive,
1767 libc_cv_asm_weakext_directive,
1769 cat > conftest.s <<EOF
1778 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1779 libc_cv_asm_weakext_directive=yes
1781 libc_cv_asm_weakext_directive=no
1787 if test $libc_cv_asm_weak_directive = yes; then
1788 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1789 elif test $libc_cv_asm_weakext_directive = yes; then
1790 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1793 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1795 sparc/sparc64*) cfi_offset=2047;;
1798 cat > conftest.s <<EOF
1800 .type func,%function
1804 .cfi_rel_offset 1, $cfi_offset
1807 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1808 libc_cv_asm_cfi_directives=yes
1810 libc_cv_asm_cfi_directives=no
1813 if test $libc_cv_asm_cfi_directives = yes; then
1814 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1817 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1818 cat > conftest.c <<\EOF
1823 dnl No \ in command here because it ends up inside ''.
1824 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1825 -nostdlib -nostartfiles -Wl,--no-whole-archive
1826 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1827 libc_cv_ld_no_whole_archive=yes
1829 libc_cv_ld_no_whole_archive=no
1832 if test $libc_cv_ld_no_whole_archive = no; then
1833 AC_MSG_ERROR([support for --no-whole-archive is needed])
1836 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1837 cat > conftest.c <<\EOF
1842 dnl No \ in command here because it ends up inside ''.
1843 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1844 -nostdlib -nostartfiles -fexceptions
1845 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1846 libc_cv_gcc_exceptions=yes
1848 libc_cv_gcc_exceptions=no
1851 if test $libc_cv_gcc_exceptions = yes; then
1852 exceptions=-fexceptions
1854 AC_SUBST(exceptions)dnl
1856 if test "$host_cpu" = powerpc ; then
1857 # Check for a bug present in at least versions 2.8.x of GCC
1858 # and versions 1.0.x of EGCS.
1859 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1860 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1861 libc_cv_c_asmcr0_bug='no',
1862 libc_cv_c_asmcr0_bug='yes')])
1863 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1864 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1868 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1869 cat > conftest.c <<\EOF
1872 __builtin_memset (x, 0, 1000);
1876 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1878 libc_cv_gcc_builtin_memset=no
1880 libc_cv_gcc_builtin_memset=yes
1883 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1884 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1887 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1888 cat > conftest.c <<\EOF
1889 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1890 char *foo (const char *a, const char *b)
1892 return __builtin_strstr (a, b);
1896 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1898 libc_cv_gcc_builtin_redirection=yes
1900 libc_cv_gcc_builtin_redirection=no
1903 if test "$libc_cv_gcc_builtin_redirection" = no; then
1904 AC_MSG_ERROR([support for the symbol redirection needed])
1907 dnl Check whether the compiler supports the __thread keyword.
1908 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1909 [cat > conftest.c <<\EOF
1910 __thread int a = 42;
1912 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1913 libc_cv_gcc___thread=yes
1915 libc_cv_gcc___thread=no
1918 if test "$libc_cv_gcc___thread" = no; then
1919 AC_MSG_ERROR([support for the __thread keyword is required])
1922 dnl Check whether the compiler supports the tls_model attribute.
1923 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1924 cat > conftest.c <<\EOF
1925 extern __thread int a __attribute__((tls_model ("initial-exec")));
1927 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1928 libc_cv_gcc_tls_model_attr=yes
1930 libc_cv_gcc_tls_model_attr=no
1933 if test "$libc_cv_gcc_tls_model_attr" = no; then
1934 AC_MSG_ERROR([support for the tls_model attribute is required])
1937 dnl Determine how to disable generation of FMA instructions.
1938 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1939 libc_cv_cc_nofma, [dnl
1941 for opt in -ffp-contract=off -mno-fused-madd; do
1942 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1945 if test -n "$submachine"; then
1946 AC_CACHE_CHECK([for compiler option for CPU variant],
1947 libc_cv_cc_submachine, [dnl
1948 libc_cv_cc_submachine=no
1949 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1950 LIBC_TRY_CC_OPTION([$opt], [
1951 libc_cv_cc_submachine="$opt"
1954 if test "x$libc_cv_cc_submachine" = xno; then
1955 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1958 AC_SUBST(libc_cv_cc_submachine)
1960 dnl Check whether we have the gd library available.
1961 AC_MSG_CHECKING(for libgd)
1962 if test "$with_gd" != "no"; then
1963 old_CFLAGS="$CFLAGS"
1964 CFLAGS="$CFLAGS $libgd_include"
1965 old_LDFLAGS="$LDFLAGS"
1966 LDFLAGS="$LDFLAGS $libgd_ldflags"
1968 LIBS="$LIBS -lgd -lpng -lz -lm"
1969 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1970 CFLAGS="$old_CFLAGS"
1971 LDFLAGS="$old_LDFLAGS"
1976 AC_MSG_RESULT($LIBGD)
1980 if test x$with_selinux = xno ; then
1983 # See if we have the SELinux library
1984 AC_CHECK_LIB(selinux, is_selinux_enabled,
1985 have_selinux=yes, have_selinux=no)
1986 # See if we have the SELinux header with the NSCD permissions in it.
1987 if test x$have_selinux = xyes ; then
1988 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1989 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1990 [#ifdef NSCD__SHMEMHOST
1993 #error NSCD__SHMEMHOST not defined
1995 have_selinux=yes, have_selinux=no)
1996 AC_MSG_RESULT($have_selinux)
1999 if test x$with_selinux = xyes ; then
2000 if test x$have_selinux = xno ; then
2001 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
2005 # Check if we're building with SELinux support.
2006 if test "x$have_selinux" = xyes; then
2007 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
2009 # See if we have the libaudit library
2010 AC_CHECK_LIB(audit, audit_log_user_avc_message,
2011 have_libaudit=yes, have_libaudit=no)
2012 if test "x$have_libaudit" = xyes; then
2013 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2015 AC_SUBST(have_libaudit)
2017 # See if we have the libcap library
2018 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2019 if test "x$have_libcap" = xyes; then
2020 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2022 AC_SUBST(have_libcap)
2024 AC_SUBST(have_selinux)
2026 dnl check for the size of 'long double'.
2027 AC_CHECK_SIZEOF(long double, 0)
2028 sizeof_long_double=$ac_cv_sizeof_long_double
2029 AC_SUBST(sizeof_long_double)
2032 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2033 dnl Since we are building the implementations of the fortified functions here,
2034 dnl having the macro defined interacts very badly.
2035 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2036 [AC_TRY_COMPILE([], [
2037 #ifdef _FORTIFY_SOURCE
2040 [libc_cv_predef_fortify_source=no],
2041 [libc_cv_predef_fortify_source=yes])])
2042 if test $libc_cv_predef_fortify_source = yes; then
2043 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2047 dnl Check for silly hacked compilers inserting -fstack-protector.
2048 dnl This breaks badly for the early startup code we compile, since
2049 dnl the compiled code can refer to a magic machine-dependent location
2050 dnl for the canary value before we have sufficient setup for that to
2051 dnl work. It's also questionable to build all of libc with this flag
2052 dnl even when you're doing that for most applications you build, since
2053 dnl libc's code is so heavily-used and performance-sensitive. If we
2054 dnl ever really want to make that work, it should be enabled explicitly
2055 dnl in the libc build, not inherited from implicit compiler settings.
2056 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2057 libc_cv_predef_stack_protector, [
2058 AC_TRY_COMPILE([extern void foobar (char *);],
2059 [char large_array[2048]; foobar (large_array);], [
2060 libc_undefs=`$NM -u conftest.o |
2061 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2062 2>&AS_MESSAGE_LOG_FD` || {
2063 AC_MSG_ERROR([confusing output from $NM -u])
2065 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2066 # On some architectures, there are architecture-specific undefined
2067 # symbols (resolved by the linker), so filter out unknown symbols.
2068 # This will fail to produce the correct result if the compiler
2069 # defaults to -fstack-protector but this produces an undefined symbol
2070 # other than __stack_chk_fail. However, compilers like that have not
2071 # been encountered in practice.
2072 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2073 case "$libc_undefs" in
2074 foobar) libc_cv_predef_stack_protector=no ;;
2076 foobar') libc_cv_predef_stack_protector=yes ;;
2077 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2079 [AC_MSG_ERROR([test compilation failed])])
2082 if test $libc_cv_predef_stack_protector = yes; then
2083 libc_extra_cflags=-fno-stack-protector
2085 AC_SUBST(libc_extra_cflags)
2087 ### End of automated tests.
2088 ### Now run sysdeps configure fragments.
2090 # They also can set these variables.
2092 ldd_rewrite_script=no
2093 libc_cv_sysconfdir=$sysconfdir
2094 libc_cv_localstatedir=$localstatedir
2095 libc_cv_gcc_unwind_find_fde=no
2098 # Iterate over all the sysdep directories we will use, running their
2099 # configure fragments.
2100 for dir in $sysnames; do
2103 *) dest=$srcdir/$dir ;;
2105 if test -r $dest/configure; then
2106 AC_MSG_RESULT(running configure fragment for $dir)
2111 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2112 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2114 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2116 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2117 # configure fragment can override the value to prevent this AC_DEFINE.
2119 if test "x$use_nscd" != xno; then
2120 AC_DEFINE([USE_NSCD])
2122 if test "x$build_nscd" = xdefault; then
2123 build_nscd=$use_nscd
2126 # Test for old glibc 2.0.x headers so that they can be removed properly
2127 # Search only in includedir.
2128 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2129 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2131 old_glibc_headers=yes
2133 old_glibc_headers=no
2135 AC_MSG_RESULT($old_glibc_headers)
2136 if test ${old_glibc_headers} = yes; then
2137 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2138 AC_MSG_WARN(*** be removed.)
2140 AC_SUBST(old_glibc_headers)
2142 AC_SUBST(libc_cv_slibdir)
2143 AC_SUBST(libc_cv_localedir)
2144 AC_SUBST(libc_cv_sysconfdir)
2145 AC_SUBST(libc_cv_localstatedir)
2146 AC_SUBST(libc_cv_rootsbindir)
2147 AC_SUBST(libc_cv_forced_unwind)
2149 dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
2150 AC_SUBST(libc_cv_cpp_asm_debuginfo)
2151 AC_SUBST(libc_cv_cc_sse4)
2152 AC_SUBST(libc_cv_cc_avx)
2153 AC_SUBST(libc_cv_cc_sse2avx)
2154 AC_SUBST(libc_cv_cc_novzeroupper)
2155 AC_SUBST(libc_cv_cc_fma4)
2156 AC_SUBST(libc_cv_cc_nofma)
2157 AC_SUBST(libc_cv_as_i686)
2158 AC_SUBST(libc_cv_sparc_as_vis3)
2160 AC_SUBST(use_ldconfig)
2161 AC_SUBST(ldd_rewrite_script)
2166 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2167 [libc_cv_pic_default=yes
2168 cat > conftest.c <<EOF
2169 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2170 # error PIC is default.
2173 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2174 libc_cv_pic_default=no
2177 AC_SUBST(libc_cv_pic_default)
2180 AC_SUBST(static_nss)
2184 dnl See sysdeps/mach/configure.in for this variable.
2185 AC_SUBST(mach_interface_list)
2187 if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
2190 config_makefile=Makefile
2193 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2194 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2198 AC_CONFIG_FILES([config.make ${config_makefile}])
2199 AC_CONFIG_COMMANDS([default],[[
2200 case $CONFIG_FILES in *config.make*)
2201 echo "$config_vars" >> config.make;;
2203 test -d bits || mkdir bits]],[[config_vars='$config_vars']])