1 dnl Process this file with autoconf to produce a configure script.
2 dnl Note we do not use AC_PREREQ here! See aclocal.m4 for what we use instead.
3 AC_INIT([GNU C Library], [(see version.h)], [http://sourceware.org/bugzilla/], [glibc])
4 AC_CONFIG_SRCDIR([include/features.h])
5 AC_CONFIG_HEADERS([config.h])
6 AC_CONFIG_AUX_DIR([scripts])
8 ACX_PKGVERSION([GNU libc])
9 ACX_BUGURL([http://www.gnu.org/software/libc/bugs.html])
10 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
11 [Package description])
12 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
13 [Bug reporting address])
15 # Glibc should not depend on any header files
16 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
17 [m4_divert_text([DEFAULTS],
18 [ac_includes_default='/* none */'])])
20 # We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
21 # here to work around the Autoconf issue discussed in
22 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
23 AC_DEFUN([AC_PROG_CPP],
24 [AC_REQUIRE([AC_PROG_CC])dnl
25 AC_ARG_VAR([CPP], [C preprocessor])dnl
26 _AC_ARG_VAR_CPPFLAGS()dnl
27 # On Suns, sometimes $CPP names a directory.
28 if test -n "$CPP" && test -d "$CPP"; then
31 if test -z "$CPP"; then
37 # We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf
39 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
40 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
42 dnl This is here so we can set $subdirs directly based on configure fragments.
48 if test $host != $build; then
49 AC_CHECK_PROGS(BUILD_CC, gcc cc)
51 AC_SUBST(cross_compiling)
53 # We need the C++ compiler only for testing.
55 AC_CHECK_TOOL(READELF, readelf, false)
57 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
58 AC_MSG_ERROR([you must configure in a separate build directory])
61 # This will get text that should go into config.make.
64 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
66 AC_HELP_STRING([--with-gd=DIR],
67 [find libgd include dir and library with prefix DIR]),
71 *) libgd_include="-I$withval/include"
72 libgd_ldflags="-L$withval/lib" ;;
75 AC_ARG_WITH([gd-include],
76 AC_HELP_STRING([--with-gd-include=DIR],
77 [find libgd include files in DIR]),
79 case "$with_gd_include" in
81 *) libgd_include="-I$withval" ;;
85 AC_HELP_STRING([--with-gd-lib=DIR],
86 [find libgd library files in DIR]),
88 case "$with_gd_lib" in
90 *) libgd_ldflags="-L$withval" ;;
94 if test -n "$libgd_include"; then
95 config_vars="$config_vars
96 CFLAGS-memusagestat.c = $libgd_include"
98 if test -n "$libgd_ldflags"; then
99 config_vars="$config_vars
100 libgd-LDFLAGS = $libgd_ldflags"
103 dnl Arguments to specify presence of other packages/features.
105 AC_HELP_STRING([--with-fp],
106 [if using floating-point hardware @<:@default=yes@:>@]),
110 AC_ARG_WITH([binutils],
111 AC_HELP_STRING([--with-binutils=PATH],
112 [specify location of binutils (as and ld)]),
113 [path_binutils=$withval],
115 AC_ARG_WITH([selinux],
116 AC_HELP_STRING([--with-selinux],
117 [if building with SELinux support]),
118 [with_selinux=$withval],
121 AC_ARG_WITH([headers],
122 AC_HELP_STRING([--with-headers=PATH],
123 [location of system headers to use
124 (for example /usr/src/linux/include)
125 @<:@default=compiler default@:>@]),
126 [sysheaders=$withval],
130 AC_SUBST(use_default_link)
131 AC_ARG_WITH([default-link],
132 AC_HELP_STRING([--with-default-link],
133 [do not use explicit linker scripts]),
134 [use_default_link=$withval],
135 [use_default_link=default])
137 AC_ARG_ENABLE([sanity-checks],
138 AC_HELP_STRING([--disable-sanity-checks],
139 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
140 [enable_sanity=$enableval],
143 AC_ARG_ENABLE([shared],
144 AC_HELP_STRING([--enable-shared],
145 [build shared library @<:@default=yes if GNU ld@:>@]),
148 AC_ARG_ENABLE([profile],
149 AC_HELP_STRING([--enable-profile],
150 [build profiled library @<:@default=no@:>@]),
151 [profile=$enableval],
154 AC_ARG_ENABLE([oldest-abi],
155 AC_HELP_STRING([--enable-oldest-abi=ABI],
156 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
157 [oldest_abi=$enableval],
159 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
162 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
166 AC_ARG_ENABLE([hardcoded-path-in-tests],
167 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
168 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
169 [hardcoded_path_in_tests=$enableval],
170 [hardcoded_path_in_tests=no])
171 AC_SUBST(hardcoded_path_in_tests)
173 AC_ARG_ENABLE([stackguard-randomization],
174 AC_HELP_STRING([--enable-stackguard-randomization],
175 [initialize __stack_chk_guard canary with a random number at program start]),
176 [enable_stackguard_randomize=$enableval],
177 [enable_stackguard_randomize=no])
178 if test "$enable_stackguard_randomize" = yes; then
179 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
182 AC_ARG_ENABLE([lock-elision],
183 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
184 [Enable lock elision for pthread mutexes by default]),
185 [enable_lock_elision=$enableval],
186 [enable_lock_elision=no])
187 AC_SUBST(enable_lock_elision)
188 if test "$enable_lock_elision" = yes ; then
189 AC_DEFINE(ENABLE_LOCK_ELISION)
192 dnl Generic infrastructure for drop-in additions to libc.
193 AC_ARG_ENABLE([add-ons],
194 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
195 [configure and build add-ons in DIR1,DIR2,...
196 search for add-ons if no parameter given]),
197 , [enable_add_ons=yes])
199 AC_ARG_ENABLE([hidden-plt],
200 AC_HELP_STRING([--disable-hidden-plt],
201 [do not hide internal function calls to avoid PLT]),
204 if test "x$hidden" = xno; then
208 AC_ARG_ENABLE([bind-now],
209 AC_HELP_STRING([--enable-bind-now],
210 [disable lazy relocations in DSOs]),
211 [bindnow=$enableval],
215 dnl On some platforms we cannot use dynamic loading. We must provide
216 dnl static NSS modules.
217 AC_ARG_ENABLE([static-nss],
218 AC_HELP_STRING([--enable-static-nss],
219 [build static NSS modules @<:@default=no@:>@]),
220 [static_nss=$enableval],
222 dnl Enable static NSS also if we build no shared objects.
223 if test x"$static_nss" = xyes || test x"$shared" = xno; then
225 AC_DEFINE(DO_STATIC_NSS)
228 AC_ARG_ENABLE([force-install],
229 AC_HELP_STRING([--disable-force-install],
230 [don't force installation of files from this package, even if they are older than the installed files]),
231 [force_install=$enableval],
233 AC_SUBST(force_install)
235 AC_ARG_ENABLE([maintainer-mode],
236 AC_HELP_STRING([--enable-maintainer-mode],
237 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
238 [maintainer=$enableval],
241 dnl On some platforms we allow dropping compatibility with all kernel
243 AC_ARG_ENABLE([kernel],
244 AC_HELP_STRING([--enable-kernel=VERSION],
245 [compile for compatibility with kernel not older than VERSION]),
246 [minimum_kernel=$enableval],
248 dnl Prevent unreasonable values.
249 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
250 # Better nothing than this.
253 if test "$minimum_kernel" = current; then
254 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
258 dnl For the development we sometimes want gcc to issue even more warnings.
259 dnl This is not the default since many of the extra warnings are not
261 AC_ARG_ENABLE([all-warnings],
262 AC_HELP_STRING([--enable-all-warnings],
263 [enable all useful warnings gcc can issue]),
264 [all_warnings=$enableval],
266 AC_SUBST(all_warnings)
268 AC_ARG_ENABLE([multi-arch],
269 AC_HELP_STRING([--enable-multi-arch],
270 [enable single DSO with optimizations for multiple architectures]),
271 [multi_arch=$enableval],
272 [multi_arch=default])
274 AC_ARG_ENABLE([nss-crypt],
275 AC_HELP_STRING([--enable-nss-crypt],
276 [enable libcrypt to use nss]),
277 [nss_crypt=$enableval],
279 if test x$nss_crypt = xyes; then
280 nss_includes=-I$(nss-config --includedir 2>/dev/null)
281 if test $? -ne 0; then
282 AC_MSG_ERROR([cannot find include directory with nss-config])
285 CFLAGS="$CFLAGS $nss_includes"
286 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
288 #include <nsslowhash.h>
289 void f (void) { NSSLOW_Init (); }])],
290 libc_cv_nss_crypt=yes,
292 cannot find NSS headers with lowlevel hash function interfaces]))
294 LIBS="$LIBS -lfreebl3"
295 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
297 #include <nsslowhash.h>],
299 libc_cv_nss_crypt=yes,
301 cannot link program using lowlevel NSS hash functions]))
307 AC_SUBST(libc_cv_nss_crypt)
310 AC_ARG_ENABLE([obsolete-rpc],
311 AC_HELP_STRING([--enable-obsolete-rpc],
312 [build and install the obsolete RPC code for link-time usage]),
313 [link_obsolete_rpc=$enableval],
314 [link_obsolete_rpc=no])
315 AC_SUBST(link_obsolete_rpc)
317 if test "$link_obsolete_rpc" = yes; then
318 AC_DEFINE(LINK_OBSOLETE_RPC)
321 AC_ARG_ENABLE([systemtap],
322 [AS_HELP_STRING([--enable-systemtap],
323 [enable systemtap static probe points @<:@default=no@:>@])],
324 [systemtap=$enableval],
326 if test "x$systemtap" != xno; then
327 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
329 CFLAGS="-std=gnu99 $CFLAGS"
330 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
331 void foo (int i, void *p)
333 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
334 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
335 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
336 CFLAGS="$old_CFLAGS"])
337 if test $libc_cv_sdt = yes; then
338 AC_DEFINE([USE_STAP_PROBE])
339 elif test "x$systemtap" != xauto; then
340 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
344 AC_ARG_ENABLE([build-nscd],
345 [AS_HELP_STRING([--disable-build-nscd],
346 [disable building and installing the nscd daemon])],
347 [build_nscd=$enableval],
348 [build_nscd=default])
351 # Note the use of $use_nscd is near the bottom of the file.
352 AC_ARG_ENABLE([nscd],
353 [AS_HELP_STRING([--disable-nscd],
354 [library functions will not contact the nscd daemon])],
355 [use_nscd=$enableval],
358 AC_ARG_ENABLE([pt_chown],
359 [AS_HELP_STRING([--enable-pt_chown],
360 [Enable building and installing pt_chown])],
361 [build_pt_chown=$enableval],
363 AC_SUBST(build_pt_chown)
364 if test "$build_pt_chown" = yes; then
365 AC_DEFINE(HAVE_PT_CHOWN)
368 # The way shlib-versions is used to generate soversions.mk uses a
369 # fairly simplistic model for name recognition that can't distinguish
370 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
371 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
372 # tell. This doesn't get used much beyond that, so it's fairly safe.
377 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
381 # We keep the original values in `$config_*' and never modify them, so we
382 # can write them unchanged into config.make. Everything else uses
383 # $machine, $vendor, and $os, and changes them whenever convenient.
384 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
386 # Don't allow vendor == "unknown"
387 test "$config_vendor" = unknown && config_vendor=
388 config_os="`echo $config_os | sed 's/^unknown-//'`"
390 # Some configurations imply other options.
393 # The configure fragment of an add-on port can modify these to supplement
394 # or override the table in the case statement below. No fragment should
395 # ever change the config_* variables, however.
396 machine=$config_machine
397 vendor=$config_vendor
401 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
403 if test "$machine" = rs6000; then
407 # Braindead PowerPC box with absolutely no FPU.
408 case "$machine-$host_os" in
416 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
419 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
421 *) submachine="$withval" ;;
425 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
426 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
428 # An add-on can set this when it wants to disable the sanity check below.
431 dnl Having this here, though empty, makes sure that if add-ons' fragments
432 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
433 dnl our AC_OUTPUT will actually use it.
436 case "$enable_add_ons" in
439 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
440 sed 's@/[[^/]]*$@@' | sort | uniq`
441 add_ons_automatic=yes
443 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
444 add_ons_automatic=no ;;
450 if test x"$add_ons" != x; then
451 for f in $add_ons; do
456 *** It seems that you're using an old \`crypt' add-on. crypt is now
457 *** part of glibc and using the old add-on will not work with this
458 *** release. Start again with fresh sources and without the old
459 *** \`crypt' add-on.])
463 *** It seems that you're using an old \`localedata' add-on. localedata
464 *** is now part of glibc and using the old add-on will not work with
465 *** this release. Start again with fresh sources and without the old
466 *** \`localedata' add-on.])
471 # Now source each add-on's configure fragment.
472 # The fragments can use $srcdir/$libc_add_on to find themselves,
473 # and test $add_ons_automatic to see if they were explicitly requested.
474 # A fragment can clear (or even change) $libc_add_on to affect
475 # whether it goes into the list to be actually used in the build.
477 for libc_add_on in $add_ons; do
478 # Test whether such a directory really exists.
479 # It can be absolute, or relative to $srcdir, or relative to the build dir.
480 case "$libc_add_on" in
482 libc_add_on_srcdir=$libc_add_on
485 test -d "$srcdir/$libc_add_on" || {
486 if test -d "$libc_add_on"; then
487 libc_add_on="`pwd`/$libc_add_on"
489 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
492 libc_add_on_srcdir=$srcdir/$libc_add_on
496 libc_add_on_frag=$libc_add_on_srcdir/configure
497 libc_add_on_canonical=
498 libc_add_on_config_subdirs=
499 if test -r "$libc_add_on_frag"; then
500 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
501 libc_add_on_canonical=unknown
503 . "$libc_add_on_frag"
504 test -z "$libc_add_on" || {
505 configured_add_ons="$configured_add_ons $libc_add_on"
506 if test "x$libc_add_on_canonical" = xunknown; then
507 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
509 for d in $libc_add_on_subdirs; do
510 case "$libc_add_on" in
511 /*) subdir_srcdir="$libc_add_on" ;;
512 *) subdir_srcdir="\$(..)$libc_add_on" ;;
516 d="${libc_add_on_canonical:-$libc_add_on}"
522 subdir_srcdir="$subdir_srcdir/$d"
525 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
526 add_on_subdirs="$add_on_subdirs $d"
527 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
528 $d-srcdir = $subdir_srcdir"
530 for d in $libc_add_on_config_subdirs; do
533 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
535 if test ! -d "$libc_add_on_srcdir/$d"; then
536 AC_MSG_ERROR(fragment wants to configure missing directory $d)
538 case "$libc_add_on" in
540 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
542 subdirs="$subdirs $libc_add_on/$d"
546 if test -n "$libc_add_on"; then
547 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
548 use_add_ons="$use_add_ons $libc_add_on"
549 add_ons_pfx="$add_ons_pfx $libc_add_on/"
550 test -z "$libc_add_on_canonical" ||
551 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
554 # Use echo to strip excess whitespace.
555 add_ons="`echo $use_add_ons`"
558 AC_SUBST(add_on_subdirs)
562 ### I put this here to prevent those annoying emails from people who cannot
563 ### read and try to compile glibc on unsupported platforms. --drepper
565 ### By using the undocumented --enable-hacker-mode option for configure
566 ### one can skip this test to make the configuration not fail for unsupported
569 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
570 case "$machine-$host_os" in
574 echo "*** The GNU C library is currently not available for this platform."
575 echo "*** So far nobody cared to port it and if there is no volunteer it"
576 echo "*** might never happen. So, if you have interest to see glibc on"
577 echo "*** this platform visit"
578 echo "*** http://www.gnu.org/software/libc/porting.html"
579 echo "*** and join the group of porters"
585 dnl We need to use [ and ] for other purposes for a while now.
587 # Expand the configuration machine name into a subdirectory by architecture
588 # type and particular chip. If an add-on configure fragment already set
589 # base_machine, we don't change it.
590 test -n "$base_machine" || case "$machine" in
591 i[4567]86) base_machine=i386 machine=i386/$machine ;;
592 powerpc64*) base_machine=powerpc machine=powerpc/powerpc64 ;;
593 powerpc*) base_machine=powerpc machine=powerpc/powerpc32 ;;
594 s390) base_machine=s390 machine=s390/s390-32 ;;
595 s390x) base_machine=s390 machine=s390/s390-64 ;;
596 sh3*) base_machine=sh machine=sh/sh3 ;;
597 sh4*) base_machine=sh machine=sh/sh4 ;;
599 base_machine=sparc machine=sparc/sparc32 ;;
600 sparcv8 | supersparc | hypersparc)
601 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
602 sparcv8plus | sparcv8plusa | sparcv9)
603 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
604 sparcv8plusb | sparcv9b)
605 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
607 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
609 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
611 base_machine=sparc machine=sparc/sparc64 ;;
613 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
615 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
617 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
618 *) base_machine=$machine ;;
621 AC_SUBST(base_machine)
623 if test "$base_machine" = "i386"; then
624 AC_DEFINE(USE_REGPARMS)
627 # For the multi-arch option we need support in the assembler & linker.
628 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
629 libc_cv_ld_gnu_indirect_function, [dnl
630 cat > conftest.S <<EOF
631 .type foo,%gnu_indirect_function
644 libc_cv_ld_gnu_indirect_function=no
645 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
646 -nostartfiles -nostdlib \
647 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
648 # Do a link to see if the backend supports IFUNC relocs.
649 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
650 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
651 libc_cv_ld_gnu_indirect_function=yes
656 AC_MSG_CHECKING(whether .text pseudo-op must be used)
657 AC_CACHE_VAL(libc_cv_dot_text, [dnl
658 cat > conftest.s <<EOF
662 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
663 libc_cv_dot_text=.text
666 if test -z "$libc_cv_dot_text"; then
672 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
673 if test x"$multi_arch" = xyes; then
674 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
680 if test x"$multi_arch" != xno; then
681 multi_arch_d=/multiarch
684 # Compute the list of sysdep directories for this configuration.
685 # This can take a while to compute.
686 sysdep_dir=$srcdir/sysdeps
687 AC_MSG_CHECKING(sysdep dirs)
688 dnl We need to use [ and ] for other purposes for a while now.
690 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
691 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
693 test "x$base_os" != x || case "$os" in
700 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
703 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
707 o=`echo $tail | sed 's/[0-9]*$//'`
708 if test $o != $tail; then
711 # For linux-gnu, try linux-gnu, then linux.
712 o=`echo $tail | sed 's/-.*$//'`
713 if test $o != $tail; then
717 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
720 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
726 # For sparc/sparc32, try sparc/sparc32 and then sparc.
728 tail=$machine${submachine:+/$submachine}
729 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
731 # Prepend the machine's FPU directory unless --without-fp.
732 if test "$with_fp" = yes; then
737 # For each machine term, try it with and then without /multiarch.
738 for try_fpu in $maybe_fpu ''; do
739 for try_multi in $multi_arch_d ''; do
740 mach="$mach /$1$try_fpu$try_multi"
746 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
749 # Find what sysdep directories exist.
752 for b in $base ''; do
753 for m0 in $mach ''; do
754 for v in /$vendor ''; do
755 test "$v" = / && continue
756 for o in /$ostry ''; do
757 test "$o" = / && continue
758 for m in $mach ''; do
759 for d in $add_ons_pfx ''; do
760 for a in $add_ons_sfx ''; do
761 try_suffix="$m0$b$v$o$m"
762 if test -n "$try_suffix"; then
763 try_srcdir="${srcdir}/"
767 try="${d}sysdeps$try_suffix$a"
768 test -n "$enable_debug_configure" &&
769 echo "$0 [DEBUG]: try $try" >&2
770 if test -d "$try_srcdir$try"; then
771 sysnames="$sysnames $try"
772 { test -n "$o" || test -n "$b"; } && os_used=t
773 { test -n "$m" || test -n "$m0"; } && machine_used=t
775 x*/$submachine) submachine_used=t ;;
777 if test -n "$d"; then
778 case "$sysnames_add_ons" in
780 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
793 # If the assembler supports gnu_indirect_function symbol type and the
794 # architecture supports multi-arch, we enable multi-arch by default.
795 case $sysnames_add_ons$sysnames in
799 test x"$multi_arch" = xdefault && multi_arch=no
802 if test x"$multi_arch" != xno; then
803 AC_DEFINE(USE_MULTIARCH)
807 if test -z "$os_used" && test "$os" != none; then
808 AC_MSG_ERROR(Operating system $os is not supported.)
810 if test -z "$machine_used" && test "$machine" != none; then
811 AC_MSG_ERROR(The $machine is not supported.)
813 if test -z "$submachine_used" && test -n "$submachine"; then
814 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
818 # We have now validated the configuration.
820 # Expand the list of system names into a full list of directories
821 # from each element's parent name and Implies file (if present).
824 while test $# -gt 0; do
828 case " $names " in *" $name "*)
829 # Already in the list.
833 # Report each name as we discover it, so there is no long pause in output.
834 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
836 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
840 *) xsrcdir=$srcdir/ ;;
842 test -n "$enable_debug_configure" &&
843 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
845 for implies_file in Implies Implies-before Implies-after; do
846 implies_type=`echo $implies_file | sed s/-/_/`
847 eval ${implies_type}=
848 if test -f $xsrcdir$name/$implies_file; then
849 # Collect more names from the `Implies' file (removing comments).
850 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
851 for x in $implied_candidate; do
853 if test -d $xsrcdir$name_base/$x; then
854 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
857 for d in $add_ons_pfx ''; do
861 *) try_srcdir=$srcdir/ ;;
863 test -n "$enable_debug_configure" &&
864 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
865 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
867 eval "${implies_type}=\"\$${implies_type} \$try\""
869 case "$sysnames_add_ons" in
871 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
875 if test $found = no; then
876 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
882 # Add NAME to the list of names.
885 # Find the parent of NAME, using the empty string if it has none.
887 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
890 test -n "$enable_debug_configure" &&
891 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
892 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
894 # Add the names implied by NAME, and NAME's parent (if it has one), to
895 # the list of names to be processed (the argument list). We prepend the
896 # implied names to the list and append the parent. We want implied
897 # directories to come before further directories inferred from the
898 # configuration components; this ensures that for sysv4, unix/common
899 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
901 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
902 test -n "$sysnames" && set $sysnames
905 # Add the default directories.
906 default_sysnames="sysdeps/generic"
907 sysnames="$names $default_sysnames"
909 # The other names were emitted during the scan.
910 AC_MSG_RESULT($default_sysnames)
912 # Collect the list of add-ons that supply partial sysdeps trees.
914 for add_on in $add_ons; do
917 *) xsrcdir="$srcdir/" ;;
920 test -d "$xsrcdir$add_on/sysdeps" || {
921 case "$configured_add_ons " in
924 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
930 sysdeps_add_ons="$sysdeps_add_ons $add_on"
931 case "$sysnames_add_ons" in
934 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
939 for d in $sysnames; do
941 $add_on/sysdeps/*) ;;
944 (cd "$xsrcdir$d" && for f in *[[!~]]; do
948 test -d "$ff" || { test -e "$ff" && exit 88; }
952 test -d "$f" || { test -e "$f" && exit 88; }
956 if test $? -eq 88; then
961 if test $found = no; then
962 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
965 AC_SUBST(sysdeps_add_ons)
971 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
972 # The makefiles need to use a different form to find it in $srcdir.
973 INSTALL='\$(..)./scripts/install-sh -c'
979 # Accept binutils 2.20 or newer.
980 AC_CHECK_PROG_VER(AS, $AS, --version,
981 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
982 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
983 AC_CHECK_PROG_VER(LD, $LD, --version,
984 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
985 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
987 # These programs are version sensitive.
989 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
990 [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
991 critic_missing="$critic_missing gcc")
992 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
993 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
994 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
996 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
997 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
998 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
999 MSGFMT=: aux_missing="$aux_missing msgfmt")
1000 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1001 [GNU texinfo.* \([0-9][0-9.]*\)],
1002 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
1003 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1004 AC_CHECK_PROG_VER(SED, sed, --version,
1005 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1006 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1007 SED=: aux_missing="$aux_missing sed")
1008 AC_CHECK_PROG_VER(AWK, gawk, --version,
1009 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1010 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1012 AC_CHECK_TOOL(NM, nm, false)
1014 if test "x$maintainer" = "xyes"; then
1015 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1016 case "x$AUTOCONF" in
1017 xno|x|x:) AUTOCONF=no ;;
1020 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1021 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1022 libc_cv_autoconf_works=yes
1024 libc_cv_autoconf_works=no
1026 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1029 if test "x$AUTOCONF" = xno; then
1030 aux_missing="$aux_missing autoconf"
1036 test -n "$critic_missing" && AC_MSG_ERROR([
1037 *** These critical programs are missing or too old:$critic_missing
1038 *** Check the INSTALL file for required versions.])
1040 test -n "$aux_missing" && AC_MSG_WARN([
1041 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1042 *** some features will be disabled.
1043 *** Check the INSTALL file for required versions.])
1045 # if using special system headers, find out the compiler's sekrit
1046 # header directory and add that to the list. NOTE: Only does the right
1047 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1048 if test -n "$sysheaders"; then
1049 SYSINCLUDES=-nostdinc
1050 for d in include include-fixed; do
1051 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1052 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1054 SYSINCLUDES="$SYSINCLUDES \
1055 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1056 if test -n "$CXX"; then
1058 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1059 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1060 test "x$cxxheaders" != x &&
1061 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1065 AC_SUBST(SYSINCLUDES)
1066 AC_SUBST(CXX_SYSINCLUDES)
1068 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1069 # since this would lead to problems installing/building glibc.
1070 # LD_LIBRARY_PATH contains the current directory if one of the following
1072 # - one of the terminals (":" and ";") is the first or last sign
1073 # - two terminals occur directly after each other
1074 # - the path contains an element with a dot in it
1075 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1077 case ${LD_LIBRARY_PATH} in
1078 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1079 ld_library_path_setting="contains current directory"
1082 ld_library_path_setting="ok"
1086 AC_MSG_RESULT($ld_library_path_setting)
1087 if test "$ld_library_path_setting" != "ok"; then
1089 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1090 *** building glibc. Please change the environment variable
1091 *** and run configure again.])
1094 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1095 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1096 libc_cv_gcc_static_libgcc=
1098 libc_cv_gcc_static_libgcc=-static-libgcc
1100 AC_SUBST(libc_cv_gcc_static_libgcc)
1102 AC_PATH_PROG(BASH_SHELL, bash, no)
1104 AC_PATH_PROG(PERL, perl, no)
1105 if test "$PERL" != no &&
1106 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1109 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1110 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1111 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1113 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1115 [#define __need_size_t
1116 #define __need_wchar_t
1119 #include <stddef.h>], [size_t size; wchar_t wchar;
1121 #error stddef.h ignored __need_*
1123 if (&size == NULL || &wchar == NULL) abort ();],
1124 libc_cv_friendly_stddef=yes,
1125 libc_cv_friendly_stddef=no)])
1126 if test $libc_cv_friendly_stddef = yes; then
1127 config_vars="$config_vars
1128 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1131 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1132 libc_cv_need_minus_P, [dnl
1133 cat > conftest.S <<EOF
1134 #include "confdefs.h"
1135 /* Nothing whatsoever. */
1137 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1138 libc_cv_need_minus_P=no
1140 libc_cv_need_minus_P=yes
1143 if test $libc_cv_need_minus_P = yes; then
1144 config_vars="$config_vars
1145 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1148 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1149 cat > conftest.s <<EOF
1152 .set glibc_conftest_frobozz,foo
1153 .globl glibc_conftest_frobozz
1155 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1156 # (but it doesn't work), so we must do a linking check to be sure.
1157 cat > conftest1.c <<\EOF
1158 extern int glibc_conftest_frobozz;
1159 void _start() { glibc_conftest_frobozz = 1; }
1161 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1162 -nostartfiles -nostdlib \
1163 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1164 libc_cv_asm_set_directive=yes
1166 libc_cv_asm_set_directive=no
1169 if test $libc_cv_asm_set_directive = yes; then
1170 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1173 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1174 libc_cv_asm_unique_object, [dnl
1175 cat > conftest.s <<EOF
1178 .type _sym, %gnu_unique_object
1180 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1181 libc_cv_asm_unique_object=yes
1183 libc_cv_asm_unique_object=no
1186 if test $libc_cv_asm_unique_object = yes; then
1187 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1190 AC_CACHE_CHECK(for .previous assembler directive,
1191 libc_cv_asm_previous_directive, [dnl
1192 cat > conftest.s <<EOF
1193 .section foo_section
1196 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1197 libc_cv_asm_previous_directive=yes
1199 libc_cv_asm_previous_directive=no
1202 if test $libc_cv_asm_previous_directive = yes; then
1203 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1205 AC_CACHE_CHECK(for .popsection assembler directive,
1206 libc_cv_asm_popsection_directive, [dnl
1207 cat > conftest.s <<EOF
1208 .pushsection foo_section
1211 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1212 libc_cv_asm_popsection_directive=yes
1214 libc_cv_asm_popsection_directive=no
1217 if test $libc_cv_asm_popsection_directive = yes; then
1218 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1221 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1222 libc_cv_asm_protected_directive, [dnl
1223 cat > conftest.s <<EOF
1229 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1230 libc_cv_asm_protected_directive=yes
1232 AC_MSG_ERROR(assembler support for symbol visibility is required)
1236 if test $libc_cv_asm_protected_directive = yes; then
1237 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1238 libc_cv_visibility_attribute,
1239 [cat > conftest.c <<EOF
1240 int foo __attribute__ ((visibility ("hidden"))) = 1;
1241 int bar __attribute__ ((visibility ("protected"))) = 1;
1243 libc_cv_visibility_attribute=no
1244 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1245 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1246 if grep '\.protected.*bar' conftest.s >/dev/null; then
1247 libc_cv_visibility_attribute=yes
1251 rm -f conftest.{c,s}
1253 if test $libc_cv_visibility_attribute != yes; then
1254 AC_MSG_ERROR(compiler support for visibility attribute is required)
1258 if test $libc_cv_visibility_attribute = yes; then
1259 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1260 libc_cv_broken_visibility_attribute,
1261 [cat > conftest.c <<EOF
1263 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1264 int bar (int x) { return x; }
1266 libc_cv_broken_visibility_attribute=yes
1267 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1269 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1271 libc_cv_broken_visibility_attribute=no
1274 rm -f conftest.c conftest.s
1276 if test $libc_cv_broken_visibility_attribute = yes; then
1277 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1281 AC_CACHE_CHECK(for broken __attribute__((alias())),
1282 libc_cv_broken_alias_attribute,
1283 [cat > conftest.c <<EOF
1284 extern int foo (int x) __asm ("xyzzy");
1285 int bar (int x) { return x; }
1286 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1288 extern __typeof (dfoo) dfoo __asm ("abccb");
1291 libc_cv_broken_alias_attribute=yes
1292 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1293 if grep 'xyzzy' conftest.s >/dev/null &&
1294 grep 'abccb' conftest.s >/dev/null; then
1295 libc_cv_broken_alias_attribute=no
1298 rm -f conftest.c conftest.s
1300 if test $libc_cv_broken_alias_attribute = yes; then
1301 AC_MSG_ERROR(working alias attribute support required)
1304 if test $libc_cv_visibility_attribute = yes; then
1305 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1306 libc_cv_have_sdata_section,
1307 [echo "int i;" > conftest.c
1308 libc_cv_have_sdata_section=no
1309 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1310 | grep '\.sdata' >/dev/null; then
1311 libc_cv_have_sdata_section=yes
1313 rm -f conftest.c conftest.so
1315 if test $libc_cv_have_sdata_section = yes; then
1316 AC_DEFINE(HAVE_SDATA_SECTION)
1320 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1321 libc_cv_initfini_array, [dnl
1322 LIBC_TRY_LINK_STATIC([
1323 int foo (void) { return 1; }
1324 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1326 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1327 libc_cv_initfini_array=yes
1329 libc_cv_initfini_array=no
1331 [libc_cv_initfini_array=no])
1333 if test $libc_cv_initfini_array != yes; then
1334 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1337 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1338 libc_cv_ctors_header, [dnl
1339 libc_cv_ctors_header=yes
1340 LIBC_TRY_LINK_STATIC([
1341 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1342 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1345 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1346 { gsub(/\@<:@ */, "@<:@") }
1347 $2 == ".ctors" || $2 == ".dtors" {
1348 size = strtonum("0x" $6)
1349 align = strtonum("0x" $NF)
1351 stub@<:@$2@:>@ = size == align * 2
1354 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1355 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1356 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1358 '], [libc_cv_ctors_header=no])
1360 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1363 if test $libc_cv_ctors_header = no; then
1364 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1367 AC_CACHE_CHECK(for libunwind-support in compiler,
1368 libc_cv_cc_with_libunwind, [
1369 cat > conftest.c <<EOF
1370 int main (void) { return 0; }
1372 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1373 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1374 libc_cv_cc_with_libunwind=yes
1376 libc_cv_cc_with_libunwind=no
1379 AC_SUBST(libc_cv_cc_with_libunwind)
1380 if test $libc_cv_cc_with_libunwind = yes; then
1381 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1384 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1385 [libc_cv_z_nodelete=yes],
1386 [AC_MSG_ERROR(linker with -z nodelete support required)])
1388 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1389 [libc_cv_z_nodlopen=yes],
1390 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1392 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1393 [libc_cv_z_initfirst=yes],
1394 [AC_MSG_ERROR(linker with -z initfirst support required)])
1396 # Add-on fragments can set these for other machines.
1397 libc_commonpagesize=${libc_commonpagesize:-no}
1398 libc_relro_required=${libc_relro_required:-no}
1399 case "$base_machine" in
1400 i[[34567]]86 | x86_64 | powerpc* | s390*)
1401 libc_commonpagesize=0x1000
1402 libc_relro_required=yes
1405 libc_commonpagesize=0x2000
1406 libc_relro_required=yes
1410 if test $libc_commonpagesize != no; then
1411 AC_CACHE_CHECK(for -z relro option,
1412 libc_cv_z_relro, [dnl
1414 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1415 int _start (void) { return 42; }
1416 extern void _exit (int);
1417 /* Since these pointers are const, they should go in rodata.
1418 Since they refer to functions that have to be resolved by
1419 dynamic linking, they should instead go in RELRO data. */
1420 const void *const relro[] = { &_start, &_exit, 0 };
1421 /* GNU ld fails to produce RELRO data when it's very small and there is no
1422 normal writable data following it, or if only uninitialized (.bss) data
1423 follows it, or only very small writable data. */
1424 int data[0x10000] = { 1, };
1426 cat > conftest.awk <<\EOF
1429 commonpagesize = strtonum(commonpagesize)
1431 { print "LINE:", $0 > "/dev/stderr" }
1433 vaddr = strtonum($3)
1434 memsz = strtonum($6)
1436 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1437 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1438 result = (end % commonpagesize == 0) ? "yes" : "broken"
1440 END { print result }
1442 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1443 -fPIC -shared -o conftest.so conftest.c
1444 -nostartfiles -nostdlib
1445 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1446 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1448 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1449 conftest.ph > conftest.cps
1451 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1453 if { test "x$libc_relro_required" = xyes &&
1454 test "x$libc_cv_z_relro" != xyes
1457 AC_MSG_ERROR(linker with -z relro support required)
1460 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1463 AC_CACHE_CHECK(for -Bgroup option,
1464 libc_cv_Bgroup, [dnl
1465 cat > conftest.c <<EOF
1466 int _start (void) { return 42; }
1468 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1469 -fPIC -shared -o conftest.so conftest.c
1470 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1477 AC_SUBST(libc_cv_Bgroup)
1480 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1481 libc_cv_as_noexecstack, [dnl
1482 cat > conftest.c <<EOF
1485 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1486 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1487 && grep .note.GNU-stack conftest.s >/dev/null \
1488 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1489 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1491 libc_cv_as_noexecstack=yes
1493 libc_cv_as_noexecstack=no
1496 if test $libc_cv_as_noexecstack = yes; then
1497 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1499 AC_SUBST(ASFLAGS_config)
1501 AC_CACHE_CHECK(for -z combreloc,
1502 libc_cv_z_combreloc, [dnl
1503 cat > conftest.c <<EOF
1504 extern int bar (int);
1506 int foo (void) { return bar (mumble); }
1508 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1509 -fPIC -shared -o conftest.so conftest.c
1510 -nostdlib -nostartfiles
1511 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1513 dnl The following test is a bit weak. We must use a tool which can test
1514 dnl cross-platform since the gcc used can be a cross compiler. Without
1515 dnl introducing new options this is not easily doable. Instead use a tool
1516 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1517 dnl look for a section named .rel.dyn.
1518 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1519 libc_cv_z_combreloc=yes
1521 libc_cv_z_combreloc=no
1524 libc_cv_z_combreloc=no
1527 if test "$libc_cv_z_combreloc" = yes; then
1528 AC_DEFINE(HAVE_Z_COMBRELOC)
1530 AC_SUBST(libc_cv_z_combreloc)
1532 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1533 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1534 AC_SUBST(libc_cv_z_execstack)
1536 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1537 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1540 AC_SUBST(libc_cv_fpie)
1542 AC_CACHE_CHECK(for --hash-style option,
1543 libc_cv_hashstyle, [dnl
1544 cat > conftest.c <<EOF
1545 int _start (void) { return 42; }
1547 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1548 -fPIC -shared -o conftest.so conftest.c
1549 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1551 libc_cv_hashstyle=yes
1553 libc_cv_hashstyle=no
1556 AC_SUBST(libc_cv_hashstyle)
1558 # The linker's default -shared behavior is good enough if it
1559 # does these things that our custom linker scripts ensure that
1560 # all allocated NOTE sections come first.
1561 if test "$use_default_link" = default; then
1562 AC_CACHE_CHECK([for sufficient default -shared layout],
1563 libc_cv_use_default_link, [dnl
1564 libc_cv_use_default_link=no
1565 cat > conftest.s <<\EOF
1566 .section .note.a,"a",%note
1571 .section .note.b,"a",%note
1577 if AC_TRY_COMMAND([dnl
1578 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1579 ac_try=`$READELF -S conftest.so | sed -n \
1581 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1587 libc_seen_a=no libc_seen_b=no
1589 while test $# -ge 2 -a "$1" = NOTE; do
1591 .note.a) libc_seen_a=yes ;;
1592 .note.b) libc_seen_b=yes ;;
1596 case "$libc_seen_a$libc_seen_b" in
1598 libc_cv_use_default_link=yes
1601 echo >&AS_MESSAGE_LOG_FD "\
1602 $libc_seen_a$libc_seen_b from:
1608 use_default_link=$libc_cv_use_default_link
1611 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1612 if libc_cv_output_format=`
1613 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1617 libc_cv_output_format=
1619 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1620 AC_SUBST(libc_cv_output_format)
1622 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1623 cat > conftest.c <<EOF
1626 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1627 conftest.c 1>&AS_MESSAGE_LOG_FD])
1629 libc_cv_fno_toplevel_reorder=yes
1631 libc_cv_fno_toplevel_reorder=no
1634 if test $libc_cv_fno_toplevel_reorder = yes; then
1635 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1637 fno_unit_at_a_time=-fno-unit-at-a-time
1639 AC_SUBST(fno_unit_at_a_time)
1641 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1642 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1646 AC_SUBST(libc_cv_ssp)
1648 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1649 cat > conftest.c <<EOF
1651 #ifdef __GNUC_GNU_INLINE__
1652 main () { return 0;}
1657 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1658 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1660 libc_cv_gnu89_inline=yes
1662 libc_cv_gnu89_inline=no
1665 if test $libc_cv_gnu89_inline = yes; then
1666 gnu89_inline=-fgnu89-inline
1670 AC_SUBST(gnu89_inline)
1672 AC_CACHE_CHECK(whether cc puts quotes around section names,
1673 libc_cv_have_section_quotes,
1674 [cat > conftest.c <<EOF
1675 static const int foo
1676 __attribute__ ((section ("bar"))) = 1;
1678 if ${CC-cc} -S conftest.c -o conftest.s; then
1679 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1680 libc_cv_have_section_quotes=yes
1682 libc_cv_have_section_quotes=no
1685 libc_cv_have_section_quotes=unknown
1687 rm -f conftest.{c,s}
1689 if test $libc_cv_have_section_quotes = yes; then
1690 AC_DEFINE(HAVE_SECTION_QUOTES)
1693 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1695 cat > conftest.s <<EOF
1700 .weak bar; bar = foo
1702 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1703 libc_cv_asm_weak_directive=yes
1705 libc_cv_asm_weak_directive=no
1709 if test $libc_cv_asm_weak_directive = no; then
1710 AC_CACHE_CHECK(for assembler .weakext directive,
1711 libc_cv_asm_weakext_directive,
1713 cat > conftest.s <<EOF
1722 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1723 libc_cv_asm_weakext_directive=yes
1725 libc_cv_asm_weakext_directive=no
1731 if test $libc_cv_asm_weak_directive = yes; then
1732 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1733 elif test $libc_cv_asm_weakext_directive = yes; then
1734 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1737 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1739 sparc/sparc64*) cfi_offset=2047;;
1742 cat > conftest.s <<EOF
1744 .type func,%function
1748 .cfi_rel_offset 1, $cfi_offset
1751 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1752 libc_cv_asm_cfi_directives=yes
1754 libc_cv_asm_cfi_directives=no
1757 if test $libc_cv_asm_cfi_directives = yes; then
1758 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1761 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1762 cat > conftest.c <<\EOF
1767 dnl No \ in command here because it ends up inside ''.
1768 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1769 -nostdlib -nostartfiles -Wl,--no-whole-archive
1770 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1771 libc_cv_ld_no_whole_archive=yes
1773 libc_cv_ld_no_whole_archive=no
1776 if test $libc_cv_ld_no_whole_archive = no; then
1777 AC_MSG_ERROR([support for --no-whole-archive is needed])
1780 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1781 cat > conftest.c <<\EOF
1786 dnl No \ in command here because it ends up inside ''.
1787 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1788 -nostdlib -nostartfiles -fexceptions
1789 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1790 libc_cv_gcc_exceptions=yes
1792 libc_cv_gcc_exceptions=no
1795 if test $libc_cv_gcc_exceptions = yes; then
1796 exceptions=-fexceptions
1798 AC_SUBST(exceptions)dnl
1800 if test "$host_cpu" = powerpc ; then
1801 # Check for a bug present in at least versions 2.8.x of GCC
1802 # and versions 1.0.x of EGCS.
1803 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1804 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1805 libc_cv_c_asmcr0_bug='no',
1806 libc_cv_c_asmcr0_bug='yes')])
1807 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1808 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1812 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1813 cat > conftest.c <<\EOF
1816 __builtin_memset (x, 0, 1000);
1820 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1822 libc_cv_gcc_builtin_memset=no
1824 libc_cv_gcc_builtin_memset=yes
1827 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1828 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1831 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1832 cat > conftest.c <<\EOF
1833 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1834 char *foo (const char *a, const char *b)
1836 return __builtin_strstr (a, b);
1840 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1842 libc_cv_gcc_builtin_redirection=yes
1844 libc_cv_gcc_builtin_redirection=no
1847 if test "$libc_cv_gcc_builtin_redirection" = no; then
1848 AC_MSG_ERROR([support for the symbol redirection needed])
1851 dnl Check whether the compiler supports the __thread keyword.
1852 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1853 [cat > conftest.c <<\EOF
1854 __thread int a = 42;
1856 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1857 libc_cv_gcc___thread=yes
1859 libc_cv_gcc___thread=no
1862 if test "$libc_cv_gcc___thread" = no; then
1863 AC_MSG_ERROR([support for the __thread keyword is required])
1866 dnl Check whether the compiler supports the tls_model attribute.
1867 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1868 cat > conftest.c <<\EOF
1869 extern __thread int a __attribute__((tls_model ("initial-exec")));
1871 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1872 libc_cv_gcc_tls_model_attr=yes
1874 libc_cv_gcc_tls_model_attr=no
1877 if test "$libc_cv_gcc_tls_model_attr" = no; then
1878 AC_MSG_ERROR([support for the tls_model attribute is required])
1881 dnl Determine how to disable generation of FMA instructions.
1882 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1883 libc_cv_cc_nofma, [dnl
1885 for opt in -ffp-contract=off -mno-fused-madd; do
1886 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1888 AC_SUBST(libc_cv_cc_nofma)
1890 if test -n "$submachine"; then
1891 AC_CACHE_CHECK([for compiler option for CPU variant],
1892 libc_cv_cc_submachine, [dnl
1893 libc_cv_cc_submachine=no
1894 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1895 LIBC_TRY_CC_OPTION([$opt], [
1896 libc_cv_cc_submachine="$opt"
1899 if test "x$libc_cv_cc_submachine" = xno; then
1900 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1903 AC_SUBST(libc_cv_cc_submachine)
1905 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1906 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1907 cat > conftest.c <<EOF
1909 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1912 libc_cv_cc_loop_to_function=no
1913 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1915 libc_cv_cc_loop_to_function=yes
1918 if test $libc_cv_cc_loop_to_function = yes; then
1919 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1921 AC_SUBST(libc_cv_cc_loop_to_function)
1923 dnl Check whether we have the gd library available.
1924 AC_MSG_CHECKING(for libgd)
1925 if test "$with_gd" != "no"; then
1926 old_CFLAGS="$CFLAGS"
1927 CFLAGS="$CFLAGS $libgd_include"
1928 old_LDFLAGS="$LDFLAGS"
1929 LDFLAGS="$LDFLAGS $libgd_ldflags"
1931 LIBS="$LIBS -lgd -lpng -lz -lm"
1932 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1933 CFLAGS="$old_CFLAGS"
1934 LDFLAGS="$old_LDFLAGS"
1939 AC_MSG_RESULT($LIBGD)
1943 if test x$with_selinux = xno ; then
1946 # See if we have the SELinux library
1947 AC_CHECK_LIB(selinux, is_selinux_enabled,
1948 have_selinux=yes, have_selinux=no)
1949 if test x$with_selinux = xyes ; then
1950 if test x$have_selinux = xno ; then
1951 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1955 # Check if we're building with SELinux support.
1956 if test "x$have_selinux" = xyes; then
1957 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1959 # See if we have the libaudit library
1960 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1961 have_libaudit=yes, have_libaudit=no)
1962 if test "x$have_libaudit" = xyes; then
1963 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1965 AC_SUBST(have_libaudit)
1967 # See if we have the libcap library
1968 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1969 if test "x$have_libcap" = xyes; then
1970 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1972 AC_SUBST(have_libcap)
1974 AC_SUBST(have_selinux)
1976 dnl check for the size of 'long double'.
1977 AC_CHECK_SIZEOF(long double, 0)
1978 sizeof_long_double=$ac_cv_sizeof_long_double
1979 AC_SUBST(sizeof_long_double)
1982 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1983 dnl Since we are building the implementations of the fortified functions here,
1984 dnl having the macro defined interacts very badly.
1985 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1986 [AC_TRY_COMPILE([], [
1987 #ifdef _FORTIFY_SOURCE
1990 [libc_cv_predef_fortify_source=no],
1991 [libc_cv_predef_fortify_source=yes])])
1992 if test $libc_cv_predef_fortify_source = yes; then
1993 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1997 dnl Check for silly hacked compilers inserting -fstack-protector.
1998 dnl This breaks badly for the early startup code we compile, since
1999 dnl the compiled code can refer to a magic machine-dependent location
2000 dnl for the canary value before we have sufficient setup for that to
2001 dnl work. It's also questionable to build all of libc with this flag
2002 dnl even when you're doing that for most applications you build, since
2003 dnl libc's code is so heavily-used and performance-sensitive. If we
2004 dnl ever really want to make that work, it should be enabled explicitly
2005 dnl in the libc build, not inherited from implicit compiler settings.
2006 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2007 libc_cv_predef_stack_protector, [
2008 AC_TRY_COMPILE([extern void foobar (char *);],
2009 [char large_array[2048]; foobar (large_array);], [
2010 libc_undefs=`$NM -u conftest.o |
2011 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2012 2>&AS_MESSAGE_LOG_FD` || {
2013 AC_MSG_ERROR([confusing output from $NM -u])
2015 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2016 # On some architectures, there are architecture-specific undefined
2017 # symbols (resolved by the linker), so filter out unknown symbols.
2018 # This will fail to produce the correct result if the compiler
2019 # defaults to -fstack-protector but this produces an undefined symbol
2020 # other than __stack_chk_fail. However, compilers like that have not
2021 # been encountered in practice.
2022 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2023 case "$libc_undefs" in
2024 foobar) libc_cv_predef_stack_protector=no ;;
2026 foobar') libc_cv_predef_stack_protector=yes ;;
2027 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2029 [AC_MSG_ERROR([test compilation failed])])
2032 if test $libc_cv_predef_stack_protector = yes; then
2033 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
2035 libc_extra_cppflags=
2037 AC_CACHE_CHECK([whether the linker provides __ehdr_start],
2038 libc_cv_ehdr_start, [
2039 old_CFLAGS="$CFLAGS"
2040 old_LDFLAGS="$LDFLAGS"
2042 CFLAGS="$CFLAGS -fPIC"
2043 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
2045 AC_LINK_IFELSE([AC_LANG_SOURCE([
2046 extern const char __ehdr_start __attribute__ ((visibility ("hidden")));
2047 const char *ehdr (void) { return &__ehdr_start; }
2049 [libc_cv_ehdr_start=yes], [libc_cv_ehdr_start=no])
2050 CFLAGS="$old_CFLAGS"
2051 LDFLAGS="$old_LDFLAGS"
2054 if test $libc_cv_ehdr_start = yes; then
2055 AC_DEFINE([HAVE_EHDR_START])
2058 ### End of automated tests.
2059 ### Now run sysdeps configure fragments.
2061 # They also can set these variables.
2063 ldd_rewrite_script=no
2064 libc_cv_sysconfdir=$sysconfdir
2065 libc_cv_localstatedir=$localstatedir
2066 libc_cv_gcc_unwind_find_fde=no
2069 # Iterate over all the sysdep directories we will use, running their
2070 # configure fragments.
2071 for dir in $sysnames; do
2074 *) dest=$srcdir/$dir ;;
2076 if test -r $dest/configure; then
2077 AC_MSG_RESULT(running configure fragment for $dir)
2082 AC_SUBST(libc_extra_cflags)
2083 AC_SUBST(libc_extra_cppflags)
2085 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2086 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2088 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2090 # A sysdeps configure fragment can reset this if IFUNC is not actually
2091 # usable even though the assembler knows how to generate the symbol type.
2092 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2093 AC_DEFINE(HAVE_IFUNC)
2096 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2097 # configure fragment can override the value to prevent this AC_DEFINE.
2099 if test "x$use_nscd" != xno; then
2100 AC_DEFINE([USE_NSCD])
2102 if test "x$build_nscd" = xdefault; then
2103 build_nscd=$use_nscd
2106 # Test for old glibc 2.0.x headers so that they can be removed properly
2107 # Search only in includedir.
2108 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2109 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2111 old_glibc_headers=yes
2113 old_glibc_headers=no
2115 AC_MSG_RESULT($old_glibc_headers)
2116 if test ${old_glibc_headers} = yes; then
2117 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2118 AC_MSG_WARN(*** be removed.)
2120 AC_SUBST(old_glibc_headers)
2122 AC_SUBST(libc_cv_slibdir)
2123 AC_SUBST(libc_cv_rtlddir)
2124 AC_SUBST(libc_cv_localedir)
2125 AC_SUBST(libc_cv_sysconfdir)
2126 AC_SUBST(libc_cv_localstatedir)
2127 AC_SUBST(libc_cv_rootsbindir)
2128 AC_SUBST(libc_cv_forced_unwind)
2130 if test x$use_ldconfig = xyes; then
2131 AC_DEFINE(USE_LDCONFIG)
2133 AC_SUBST(use_ldconfig)
2134 AC_SUBST(ldd_rewrite_script)
2139 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2140 [libc_cv_pic_default=yes
2141 cat > conftest.c <<EOF
2142 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2143 # error PIC is default.
2146 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2147 libc_cv_pic_default=no
2150 AC_SUBST(libc_cv_pic_default)
2153 AC_SUBST(static_nss)
2157 dnl See sysdeps/mach/configure.ac for this variable.
2158 AC_SUBST(mach_interface_list)
2160 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2161 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2165 AC_CONFIG_FILES([config.make Makefile])
2166 AC_CONFIG_COMMANDS([default],[[
2167 case $CONFIG_FILES in *config.make*)
2168 echo "$config_vars" >> config.make;;
2170 test -d bits || mkdir bits]],[[config_vars='$config_vars']])