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=$enableval],
153 AC_ARG_ENABLE([versioning],
154 AC_HELP_STRING([--disable-versioning],
155 [do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
156 [enable_versioning=$enableval],
157 [enable_versioning=yes])
159 AC_ARG_ENABLE([oldest-abi],
160 AC_HELP_STRING([--enable-oldest-abi=ABI],
161 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
162 [oldest_abi=$enableval],
164 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
167 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
171 AC_ARG_ENABLE([hardcoded-path-in-tests],
172 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
173 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
174 [hardcoded_path_in_tests=$enableval],
175 [hardcoded_path_in_tests=no])
176 AC_SUBST(hardcoded_path_in_tests)
178 AC_ARG_ENABLE([stackguard-randomization],
179 AC_HELP_STRING([--enable-stackguard-randomization],
180 [initialize __stack_chk_guard canary with a random number at program start]),
181 [enable_stackguard_randomize=$enableval],
182 [enable_stackguard_randomize=no])
183 if test "$enable_stackguard_randomize" = yes; then
184 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
187 dnl Generic infrastructure for drop-in additions to libc.
188 AC_ARG_ENABLE([add-ons],
189 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
190 [configure and build add-ons in DIR1,DIR2,...
191 search for add-ons if no parameter given]),
192 , [enable_add_ons=yes])
194 AC_ARG_ENABLE([hidden-plt],
195 AC_HELP_STRING([--disable-hidden-plt],
196 [do not hide internal function calls to avoid PLT]),
199 if test "x$hidden" = xno; then
203 AC_ARG_ENABLE([bind-now],
204 AC_HELP_STRING([--enable-bind-now],
205 [disable lazy relocations in DSOs]),
206 [bindnow=$enableval],
210 dnl On some platforms we cannot use dynamic loading. We must provide
211 dnl static NSS modules.
212 AC_ARG_ENABLE([static-nss],
213 AC_HELP_STRING([--enable-static-nss],
214 [build static NSS modules @<:@default=no@:>@]),
215 [static_nss=$enableval],
217 dnl Enable static NSS also if we build no shared objects.
218 if test x"$static_nss" = xyes || test x"$shared" = xno; then
220 AC_DEFINE(DO_STATIC_NSS)
223 AC_ARG_ENABLE([force-install],
224 AC_HELP_STRING([--disable-force-install],
225 [don't force installation of files from this package, even if they are older than the installed files]),
226 [force_install=$enableval],
228 AC_SUBST(force_install)
230 dnl On some platforms we allow dropping compatibility with all kernel
232 AC_ARG_ENABLE([kernel],
233 AC_HELP_STRING([--enable-kernel=VERSION],
234 [compile for compatibility with kernel not older than VERSION]),
235 [minimum_kernel=$enableval],
237 dnl Prevent unreasonable values.
238 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
239 # Better nothing than this.
242 if test "$minimum_kernel" = current; then
243 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
247 dnl For the development we sometimes want gcc to issue even more warnings.
248 dnl This is not the default since many of the extra warnings are not
250 AC_ARG_ENABLE([all-warnings],
251 AC_HELP_STRING([--enable-all-warnings],
252 [enable all useful warnings gcc can issue]),
253 [all_warnings=$enableval],
255 AC_SUBST(all_warnings)
257 AC_ARG_ENABLE([multi-arch],
258 AC_HELP_STRING([--enable-multi-arch],
259 [enable single DSO with optimizations for multiple architectures]),
260 [multi_arch=$enableval],
261 [multi_arch=default])
263 AC_ARG_ENABLE([nss-crypt],
264 AC_HELP_STRING([--enable-nss-crypt],
265 [enable libcrypt to use nss]),
266 [nss_crypt=$enableval],
268 if test x$nss_crypt = xyes; then
269 nss_includes=-I$(nss-config --includedir 2>/dev/null)
270 if test $? -ne 0; then
271 AC_MSG_ERROR([cannot find include directory with nss-config])
274 CFLAGS="$CFLAGS $nss_includes"
275 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
277 #include <nsslowhash.h>
278 void f (void) { NSSLOW_Init (); }])],
279 libc_cv_nss_crypt=yes,
281 cannot find NSS headers with lowlevel hash function interfaces]))
283 LIBS="$LIBS -lfreebl3"
284 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
286 #include <nsslowhash.h>],
288 libc_cv_nss_crypt=yes,
290 cannot link program using lowlevel NSS hash functions]))
296 AC_SUBST(libc_cv_nss_crypt)
299 AC_ARG_ENABLE([obsolete-rpc],
300 AC_HELP_STRING([--enable-obsolete-rpc],
301 [build and install the obsolete RPC code for link-time usage]),
302 [link_obsolete_rpc=$enableval],
303 [link_obsolete_rpc=no])
304 AC_SUBST(link_obsolete_rpc)
306 if test "$link_obsolete_rpc" = yes; then
307 AC_DEFINE(LINK_OBSOLETE_RPC)
310 AC_ARG_ENABLE([systemtap],
311 [AS_HELP_STRING([--enable-systemtap],
312 [enable systemtap static probe points @<:@default=no@:>@])],
313 [systemtap=$enableval],
315 if test "x$systemtap" != xno; then
316 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
318 CFLAGS="-std=gnu99 $CFLAGS"
319 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
320 void foo (int i, void *p)
322 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
323 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
324 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
325 CFLAGS="$old_CFLAGS"])
326 if test $libc_cv_sdt = yes; then
327 AC_DEFINE([USE_STAP_PROBE])
328 elif test "x$systemtap" != xauto; then
329 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
333 AC_ARG_ENABLE([build-nscd],
334 [AS_HELP_STRING([--disable-build-nscd],
335 [disable building and installing the nscd daemon])],
336 [build_nscd=$enableval],
337 [build_nscd=default])
340 # Note the use of $use_nscd is near the bottom of the file.
341 AC_ARG_ENABLE([nscd],
342 [AS_HELP_STRING([--disable-nscd],
343 [library functions will not contact the nscd daemon])],
344 [use_nscd=$enableval],
347 # The way shlib-versions is used to generate soversions.mk uses a
348 # fairly simplistic model for name recognition that can't distinguish
349 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
350 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
351 # tell. This doesn't get used much beyond that, so it's fairly safe.
356 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
360 # We keep the original values in `$config_*' and never modify them, so we
361 # can write them unchanged into config.make. Everything else uses
362 # $machine, $vendor, and $os, and changes them whenever convenient.
363 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
365 # Don't allow vendor == "unknown"
366 test "$config_vendor" = unknown && config_vendor=
367 config_os="`echo $config_os | sed 's/^unknown-//'`"
369 # Some configurations imply other options.
372 # The configure fragment of an add-on port can modify these to supplement
373 # or override the table in the case statement below. No fragment should
374 # ever change the config_* variables, however.
375 machine=$config_machine
376 vendor=$config_vendor
380 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
382 if test "$machine" = rs6000; then
386 # Braindead PowerPC box with absolutely no FPU.
387 case "$machine-$host_os" in
393 # Configure for i686 if the user asks for i386. We don't support
394 # i386 any more but it continues to be common for users to configure
395 # 32-bit x86 as i386. We build for i686 instead.
396 if test "$machine" = i386; then
399 *** WARNING: Support for i386 is deprecated. Building for i686 instead."
404 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
407 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
409 *) submachine="$withval" ;;
413 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
414 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
416 # An add-on can set this when it wants to disable the sanity check below.
419 dnl Having this here, though empty, makes sure that if add-ons' fragments
420 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
421 dnl our AC_OUTPUT will actually use it.
424 case "$enable_add_ons" in
427 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
428 sed 's@/[[^/]]*$@@' | sort | uniq`
429 add_ons_automatic=yes
431 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
432 add_ons_automatic=no ;;
438 if test x"$add_ons" != x; then
439 for f in $add_ons; do
444 *** It seems that you're using an old \`crypt' add-on. crypt is now
445 *** part of glibc and using the old add-on will not work with this
446 *** release. Start again with fresh sources and without the old
447 *** \`crypt' add-on.])
451 *** It seems that you're using an old \`localedata' add-on. localedata
452 *** is now part of glibc and using the old add-on will not work with
453 *** this release. Start again with fresh sources and without the old
454 *** \`localedata' add-on.])
459 # Now source each add-on's configure fragment.
460 # The fragments can use $srcdir/$libc_add_on to find themselves,
461 # and test $add_ons_automatic to see if they were explicitly requested.
462 # A fragment can clear (or even change) $libc_add_on to affect
463 # whether it goes into the list to be actually used in the build.
465 for libc_add_on in $add_ons; do
466 # Test whether such a directory really exists.
467 # It can be absolute, or relative to $srcdir, or relative to the build dir.
468 case "$libc_add_on" in
470 libc_add_on_srcdir=$libc_add_on
473 test -d "$srcdir/$libc_add_on" || {
474 if test -d "$libc_add_on"; then
475 libc_add_on="`pwd`/$libc_add_on"
477 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
480 libc_add_on_srcdir=$srcdir/$libc_add_on
484 libc_add_on_frag=$libc_add_on_srcdir/configure
485 libc_add_on_canonical=
486 libc_add_on_config_subdirs=
487 if test -r "$libc_add_on_frag"; then
488 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
489 libc_add_on_canonical=unknown
491 . "$libc_add_on_frag"
492 test -z "$libc_add_on" || {
493 configured_add_ons="$configured_add_ons $libc_add_on"
494 if test "x$libc_add_on_canonical" = xunknown; then
495 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
497 for d in $libc_add_on_subdirs; do
498 case "$libc_add_on" in
499 /*) subdir_srcdir="$libc_add_on" ;;
500 *) subdir_srcdir="\$(..)$libc_add_on" ;;
504 d="${libc_add_on_canonical:-$libc_add_on}"
510 subdir_srcdir="$subdir_srcdir/$d"
513 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
514 add_on_subdirs="$add_on_subdirs $d"
515 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
516 $d-srcdir = $subdir_srcdir"
518 for d in $libc_add_on_config_subdirs; do
521 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
523 if test ! -d "$libc_add_on_srcdir/$d"; then
524 AC_MSG_ERROR(fragment wants to configure missing directory $d)
526 case "$libc_add_on" in
528 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
530 subdirs="$subdirs $libc_add_on/$d"
534 if test -n "$libc_add_on"; then
535 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
536 use_add_ons="$use_add_ons $libc_add_on"
537 add_ons_pfx="$add_ons_pfx $libc_add_on/"
538 test -z "$libc_add_on_canonical" ||
539 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
542 # Use echo to strip excess whitespace.
543 add_ons="`echo $use_add_ons`"
546 AC_SUBST(add_on_subdirs)
550 ### I put this here to prevent those annoying emails from people who cannot
551 ### read and try to compile glibc on unsupported platforms. --drepper
553 ### By using the undocumented --enable-hacker-mode option for configure
554 ### one can skip this test to make the configuration not fail for unsupported
557 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
558 case "$machine-$host_os" in
562 echo "*** The GNU C library is currently not available for this platform."
563 echo "*** So far nobody cared to port it and if there is no volunteer it"
564 echo "*** might never happen. So, if you have interest to see glibc on"
565 echo "*** this platform visit"
566 echo "*** http://www.gnu.org/software/libc/porting.html"
567 echo "*** and join the group of porters"
573 dnl We need to use [ and ] for other purposes for a while now.
575 # Expand the configuration machine name into a subdirectory by architecture
576 # type and particular chip. If an add-on configure fragment already set
577 # base_machine, we don't change it.
578 test -n "$base_machine" || case "$machine" in
579 i[34567]86) base_machine=i386 machine=i386/$machine ;;
580 powerpc) base_machine=powerpc machine=powerpc/powerpc32 ;;
581 powerpc64) base_machine=powerpc machine=powerpc/powerpc64 ;;
582 s390) base_machine=s390 machine=s390/s390-32 ;;
583 s390x) base_machine=s390 machine=s390/s390-64 ;;
584 sh3*) base_machine=sh machine=sh/sh3 ;;
585 sh4*) base_machine=sh machine=sh/sh4 ;;
587 base_machine=sparc machine=sparc/sparc32 ;;
588 sparcv8 | supersparc | hypersparc)
589 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
590 sparcv8plus | sparcv8plusa | sparcv9)
591 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
592 sparcv8plusb | sparcv9b)
593 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
595 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
597 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
599 base_machine=sparc machine=sparc/sparc64 ;;
601 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
603 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
605 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
606 *) base_machine=$machine ;;
609 AC_SUBST(base_machine)
611 if test "$base_machine" = "i386"; then
612 AC_DEFINE(USE_REGPARMS)
615 # For the multi-arch option we need support in the assembler & linker.
616 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
617 libc_cv_ld_gnu_indirect_function, [dnl
618 cat > conftest.S <<EOF
619 .type foo,%gnu_indirect_function
632 libc_cv_ld_gnu_indirect_function=no
633 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
634 -nostartfiles -nostdlib \
635 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
636 # Do a link to see if the backend supports IFUNC relocs.
637 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
638 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
639 libc_cv_ld_gnu_indirect_function=yes
644 AC_MSG_CHECKING(whether .text pseudo-op must be used)
645 AC_CACHE_VAL(libc_cv_dot_text, [dnl
646 cat > conftest.s <<EOF
650 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
651 libc_cv_dot_text=.text
654 if test -z "$libc_cv_dot_text"; then
660 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
661 if test x"$multi_arch" = xyes; then
662 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
668 if test x"$multi_arch" != xno; then
669 multi_arch_d=/multiarch
672 # Compute the list of sysdep directories for this configuration.
673 # This can take a while to compute.
674 sysdep_dir=$srcdir/sysdeps
675 AC_MSG_CHECKING(sysdep dirs)
676 dnl We need to use [ and ] for other purposes for a while now.
678 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
679 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
681 test "x$base_os" != x || case "$os" in
688 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
691 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
695 o=`echo $tail | sed 's/[0-9]*$//'`
696 if test $o != $tail; then
699 # For linux-gnu, try linux-gnu, then linux.
700 o=`echo $tail | sed 's/-.*$//'`
701 if test $o != $tail; then
705 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
708 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
714 # For sparc/sparc32, try sparc/sparc32 and then sparc.
716 tail=$machine${submachine:+/$submachine}
717 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
719 # Prepend the machine's FPU directory unless --without-fp.
720 if test "$with_fp" = yes; then
725 # For each machine term, try it with and then without /multiarch.
726 for try_fpu in $maybe_fpu ''; do
727 for try_multi in $multi_arch_d ''; do
728 mach="$mach /$1$try_fpu$try_multi"
734 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
737 # Find what sysdep directories exist.
740 for b in $base ''; do
741 for m0 in $mach ''; do
742 for v in /$vendor ''; do
743 test "$v" = / && continue
744 for o in /$ostry ''; do
745 test "$o" = / && continue
746 for m in $mach ''; do
747 for d in $add_ons_pfx ''; do
748 for a in $add_ons_sfx ''; do
749 try_suffix="$m0$b$v$o$m"
750 if test -n "$try_suffix"; then
751 try_srcdir="${srcdir}/"
755 try="${d}sysdeps$try_suffix$a"
756 test -n "$enable_debug_configure" &&
757 echo "$0 [DEBUG]: try $try" >&2
758 if test -d "$try_srcdir$try"; then
759 sysnames="$sysnames $try"
760 { test -n "$o" || test -n "$b"; } && os_used=t
761 { test -n "$m" || test -n "$m0"; } && machine_used=t
763 x*/$submachine) submachine_used=t ;;
765 if test -n "$d"; then
766 case "$sysnames_add_ons" in
768 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
781 # If the assembler supports gnu_indirect_function symbol type and the
782 # architecture supports multi-arch, we enable multi-arch by default.
783 case $sysnames_add_ons$sysnames in
787 test x"$multi_arch" = xdefault && multi_arch=no
790 if test x"$multi_arch" != xno; then
791 AC_DEFINE(USE_MULTIARCH)
795 if test -z "$os_used" && test "$os" != none; then
796 AC_MSG_ERROR(Operating system $os is not supported.)
798 if test -z "$machine_used" && test "$machine" != none; then
799 AC_MSG_ERROR(The $machine is not supported.)
801 if test -z "$submachine_used" && test -n "$submachine"; then
802 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
806 # We have now validated the configuration.
808 # Expand the list of system names into a full list of directories
809 # from each element's parent name and Implies file (if present).
812 while test $# -gt 0; do
816 case " $names " in *" $name "*)
817 # Already in the list.
821 # Report each name as we discover it, so there is no long pause in output.
822 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
824 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
828 *) xsrcdir=$srcdir/ ;;
830 test -n "$enable_debug_configure" &&
831 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
833 for implies_file in Implies Implies-before Implies-after; do
834 implies_type=`echo $implies_file | sed s/-/_/`
835 eval ${implies_type}=
836 if test -f $xsrcdir$name/$implies_file; then
837 # Collect more names from the `Implies' file (removing comments).
838 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
839 for x in $implied_candidate; do
841 if test -d $xsrcdir$name_base/$x; then
842 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
845 for d in $add_ons_pfx ''; do
849 *) try_srcdir=$srcdir/ ;;
851 test -n "$enable_debug_configure" &&
852 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
853 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
855 eval "${implies_type}=\"\$${implies_type} \$try\""
857 case "$sysnames_add_ons" in
859 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
863 if test $found = no; then
864 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
870 # Add NAME to the list of names.
873 # Find the parent of NAME, using the empty string if it has none.
875 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
878 test -n "$enable_debug_configure" &&
879 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
880 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
882 # Add the names implied by NAME, and NAME's parent (if it has one), to
883 # the list of names to be processed (the argument list). We prepend the
884 # implied names to the list and append the parent. We want implied
885 # directories to come before further directories inferred from the
886 # configuration components; this ensures that for sysv4, unix/common
887 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
889 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
890 test -n "$sysnames" && set $sysnames
893 # Add the default directories.
894 default_sysnames="sysdeps/generic"
895 sysnames="$names $default_sysnames"
897 # The other names were emitted during the scan.
898 AC_MSG_RESULT($default_sysnames)
900 # Collect the list of add-ons that supply partial sysdeps trees.
902 for add_on in $add_ons; do
905 *) xsrcdir="$srcdir/" ;;
908 test -d "$xsrcdir$add_on/sysdeps" || {
909 case "$configured_add_ons " in
912 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
918 sysdeps_add_ons="$sysdeps_add_ons $add_on"
919 case "$sysnames_add_ons" in
922 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
927 for d in $sysnames; do
929 $add_on/sysdeps/*) ;;
932 (cd "$xsrcdir$d" && for f in *[[!~]]; do
936 test -d "$ff" || { test -e "$ff" && exit 88; }
940 test -d "$f" || { test -e "$f" && exit 88; }
944 if test $? -eq 88; then
949 if test $found = no; then
950 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
953 AC_SUBST(sysdeps_add_ons)
959 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
960 # The makefiles need to use a different form to find it in $srcdir.
961 INSTALL='\$(..)./scripts/install-sh -c'
967 # Accept binutils 2.20 or newer.
968 AC_CHECK_PROG_VER(AS, $AS, --version,
969 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
970 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
971 AC_CHECK_PROG_VER(LD, $LD, --version,
972 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
973 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
975 # These programs are version sensitive.
977 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
978 [version \([egcygnustpi-]*[0-9.]*\)], [4.[3-9].* | 4.[1-9][0-9].* | [5-9].* ],
979 critic_missing="$critic_missing gcc")
980 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
981 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
982 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
984 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
985 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
986 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
987 MSGFMT=: aux_missing="$aux_missing msgfmt")
988 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
989 [GNU texinfo.* \([0-9][0-9.]*\)],
990 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
991 MAKEINFO=: aux_missing="$aux_missing makeinfo")
992 AC_CHECK_PROG_VER(SED, sed, --version,
993 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
994 [3.0[2-9]*|3.[1-9]*|[4-9]*],
995 SED=: aux_missing="$aux_missing sed")
996 AC_CHECK_PROG_VER(AWK, gawk, --version,
997 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
998 [[3-9].*], critic_missing="$critic_missing gawk")
1000 AC_CHECK_TOOL(NM, nm, false)
1002 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1003 case "x$AUTOCONF" in
1004 xno|x|x:) AUTOCONF=no ;;
1007 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1008 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
1009 libc_cv_autoconf_works=yes
1011 libc_cv_autoconf_works=no
1013 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1016 if test "x$AUTOCONF" = xno; then
1017 aux_missing="$aux_missing autoconf"
1020 test -n "$critic_missing" && AC_MSG_ERROR([
1021 *** These critical programs are missing or too old:$critic_missing
1022 *** Check the INSTALL file for required versions.])
1024 test -n "$aux_missing" && AC_MSG_WARN([
1025 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1026 *** some features will be disabled.
1027 *** Check the INSTALL file for required versions.])
1029 # if using special system headers, find out the compiler's sekrit
1030 # header directory and add that to the list. NOTE: Only does the right
1031 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1032 if test -n "$sysheaders"; then
1033 SYSINCLUDES=-nostdinc
1034 for d in include include-fixed; do
1035 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1036 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1038 SYSINCLUDES="$SYSINCLUDES \
1039 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1040 if test -n "$CXX"; then
1042 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1043 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1044 test "x$cxxheaders" != x &&
1045 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1049 AC_SUBST(SYSINCLUDES)
1050 AC_SUBST(CXX_SYSINCLUDES)
1052 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1053 # since this would lead to problems installing/building glibc.
1054 # LD_LIBRARY_PATH contains the current directory if one of the following
1056 # - one of the terminals (":" and ";") is the first or last sign
1057 # - two terminals occur directly after each other
1058 # - the path contains an element with a dot in it
1059 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1061 case ${LD_LIBRARY_PATH} in
1062 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1063 ld_library_path_setting="contains current directory"
1066 ld_library_path_setting="ok"
1070 AC_MSG_RESULT($ld_library_path_setting)
1071 if test "$ld_library_path_setting" != "ok"; then
1073 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1074 *** building glibc. Please change the environment variable
1075 *** and run configure again.])
1078 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1079 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1080 libc_cv_gcc_static_libgcc=
1082 libc_cv_gcc_static_libgcc=-static-libgcc
1084 AC_SUBST(libc_cv_gcc_static_libgcc)
1086 AC_PATH_PROG(BASH_SHELL, bash, no)
1087 if test "$BASH_SHELL" != no &&
1088 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1089 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1090 libc_cv_have_bash2=yes
1092 libc_cv_have_bash2=no
1094 AC_SUBST(libc_cv_have_bash2)
1096 dnl We need a ksh compatible shell for tzselect.
1097 if test "$BASH_SHELL" = no; then
1098 AC_PATH_PROG(KSH, ksh, no)
1099 if test "$KSH" = no; then
1102 libc_cv_have_ksh=yes
1107 libc_cv_have_ksh=yes
1109 AC_SUBST(libc_cv_have_ksh)
1111 AC_PATH_PROG(PERL, perl, no)
1112 if test "$PERL" != no &&
1113 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1116 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1117 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1118 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1120 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1122 [#define __need_size_t
1123 #define __need_wchar_t
1126 #include <stddef.h>], [size_t size; wchar_t wchar;
1128 #error stddef.h ignored __need_*
1130 if (&size == NULL || &wchar == NULL) abort ();],
1131 libc_cv_friendly_stddef=yes,
1132 libc_cv_friendly_stddef=no)])
1133 if test $libc_cv_friendly_stddef = yes; then
1134 config_vars="$config_vars
1135 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1138 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1139 libc_cv_need_minus_P, [dnl
1140 cat > conftest.S <<EOF
1141 #include "confdefs.h"
1142 /* Nothing whatsoever. */
1144 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1145 libc_cv_need_minus_P=no
1147 libc_cv_need_minus_P=yes
1150 if test $libc_cv_need_minus_P = yes; then
1151 config_vars="$config_vars
1152 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1155 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1156 cat > conftest.s <<EOF
1159 .set glibc_conftest_frobozz,foo
1160 .globl glibc_conftest_frobozz
1162 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1163 # (but it doesn't work), so we must do a linking check to be sure.
1164 cat > conftest1.c <<\EOF
1165 extern int glibc_conftest_frobozz;
1166 void _start() { glibc_conftest_frobozz = 1; }
1168 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1169 -nostartfiles -nostdlib \
1170 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1171 libc_cv_asm_set_directive=yes
1173 libc_cv_asm_set_directive=no
1176 if test $libc_cv_asm_set_directive = yes; then
1177 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1180 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1181 libc_cv_asm_unique_object, [dnl
1182 cat > conftest.s <<EOF
1185 .type _sym, %gnu_unique_object
1187 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1188 libc_cv_asm_unique_object=yes
1190 libc_cv_asm_unique_object=no
1193 if test $libc_cv_asm_unique_object = yes; then
1194 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1197 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1198 [cat > conftest.s <<EOF
1201 .symver _sym,sym@VERS
1203 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1204 libc_cv_asm_symver_directive=yes
1206 libc_cv_asm_symver_directive=no
1209 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1210 if test $libc_cv_asm_symver_directive = yes; then
1211 cat > conftest.s <<EOF
1214 .symver _sym,sym@VERS
1216 cat > conftest.map <<EOF
1225 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1226 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1227 -o conftest.so conftest.o
1228 -nostartfiles -nostdlib
1229 -Wl,--version-script,conftest.map
1230 1>&AS_MESSAGE_LOG_FD]);
1232 libc_cv_ld_version_script_option=yes
1234 libc_cv_ld_version_script_option=no
1237 libc_cv_ld_version_script_option=no
1240 libc_cv_ld_version_script_option=no
1243 if test $shared != no &&
1244 test $libc_cv_asm_symver_directive = yes &&
1245 test $libc_cv_ld_version_script_option = yes &&
1246 test $enable_versioning = yes; then
1248 AC_DEFINE(DO_VERSIONING)
1252 AC_SUBST(VERSIONING)
1254 if test $shared != no && test $VERSIONING = no; then
1256 *** WARNING: You should not compile GNU libc without versioning. Not using
1257 *** versioning will introduce incompatibilities so that old binaries
1258 *** will not run anymore.
1259 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1261 AC_CACHE_CHECK(for .previous assembler directive,
1262 libc_cv_asm_previous_directive, [dnl
1263 cat > conftest.s <<EOF
1264 .section foo_section
1267 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1268 libc_cv_asm_previous_directive=yes
1270 libc_cv_asm_previous_directive=no
1273 if test $libc_cv_asm_previous_directive = yes; then
1274 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1276 AC_CACHE_CHECK(for .popsection assembler directive,
1277 libc_cv_asm_popsection_directive, [dnl
1278 cat > conftest.s <<EOF
1279 .pushsection foo_section
1282 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1283 libc_cv_asm_popsection_directive=yes
1285 libc_cv_asm_popsection_directive=no
1288 if test $libc_cv_asm_popsection_directive = yes; then
1289 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1292 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1293 libc_cv_asm_protected_directive, [dnl
1294 cat > conftest.s <<EOF
1300 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1301 libc_cv_asm_protected_directive=yes
1303 AC_MSG_ERROR(assembler support for symbol visibility is required)
1307 if test $libc_cv_asm_protected_directive = yes; then
1308 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1309 libc_cv_visibility_attribute,
1310 [cat > conftest.c <<EOF
1311 int foo __attribute__ ((visibility ("hidden"))) = 1;
1312 int bar __attribute__ ((visibility ("protected"))) = 1;
1314 libc_cv_visibility_attribute=no
1315 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1316 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1317 if grep '\.protected.*bar' conftest.s >/dev/null; then
1318 libc_cv_visibility_attribute=yes
1322 rm -f conftest.{c,s}
1324 if test $libc_cv_visibility_attribute != yes; then
1325 AC_MSG_ERROR(compiler support for visibility attribute is required)
1329 if test $libc_cv_visibility_attribute = yes; then
1330 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1331 libc_cv_broken_visibility_attribute,
1332 [cat > conftest.c <<EOF
1334 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1335 int bar (int x) { return x; }
1337 libc_cv_broken_visibility_attribute=yes
1338 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1340 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1342 libc_cv_broken_visibility_attribute=no
1345 rm -f conftest.c conftest.s
1347 if test $libc_cv_broken_visibility_attribute = yes; then
1348 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1352 AC_CACHE_CHECK(for broken __attribute__((alias())),
1353 libc_cv_broken_alias_attribute,
1354 [cat > conftest.c <<EOF
1355 extern int foo (int x) __asm ("xyzzy");
1356 int bar (int x) { return x; }
1357 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1359 extern __typeof (dfoo) dfoo __asm ("abccb");
1362 libc_cv_broken_alias_attribute=yes
1363 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1364 if grep 'xyzzy' conftest.s >/dev/null &&
1365 grep 'abccb' conftest.s >/dev/null; then
1366 libc_cv_broken_alias_attribute=no
1369 rm -f conftest.c conftest.s
1371 if test $libc_cv_broken_alias_attribute = yes; then
1372 AC_MSG_ERROR(working alias attribute support required)
1375 if test $libc_cv_visibility_attribute = yes; then
1376 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1377 libc_cv_have_sdata_section,
1378 [echo "int i;" > conftest.c
1379 libc_cv_have_sdata_section=no
1380 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1381 | grep '\.sdata' >/dev/null; then
1382 libc_cv_have_sdata_section=yes
1384 rm -f conftest.c conftest.so
1386 if test $libc_cv_have_sdata_section = yes; then
1387 AC_DEFINE(HAVE_SDATA_SECTION)
1391 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1392 libc_cv_initfini_array, [dnl
1393 LIBC_TRY_LINK_STATIC([
1394 int foo (void) { return 1; }
1395 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1397 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1398 libc_cv_initfini_array=yes
1400 libc_cv_initfini_array=no
1402 [libc_cv_initfini_array=no])
1404 if test $libc_cv_initfini_array != yes; then
1405 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1408 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1409 libc_cv_ctors_header, [dnl
1410 libc_cv_ctors_header=yes
1411 LIBC_TRY_LINK_STATIC([
1412 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1413 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1416 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1417 { gsub(/\@<:@ */, "@<:@") }
1418 $2 == ".ctors" || $2 == ".dtors" {
1419 size = strtonum("0x" $6)
1420 align = strtonum("0x" $NF)
1422 stub@<:@$2@:>@ = size == align * 2
1425 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1426 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1427 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1429 '], [libc_cv_ctors_header=no])
1431 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1434 if test $libc_cv_ctors_header = no; then
1435 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1438 AC_CACHE_CHECK(for libunwind-support in compiler,
1439 libc_cv_cc_with_libunwind, [
1440 cat > conftest.c <<EOF
1441 int main (void) { return 0; }
1443 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1444 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1445 libc_cv_cc_with_libunwind=yes
1447 libc_cv_cc_with_libunwind=no
1450 AC_SUBST(libc_cv_cc_with_libunwind)
1451 if test $libc_cv_cc_with_libunwind = yes; then
1452 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1455 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1456 [libc_cv_z_nodelete=yes],
1457 [AC_MSG_ERROR(linker with -z nodelete support required)])
1459 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1460 [libc_cv_z_nodlopen=yes],
1461 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1463 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1464 [libc_cv_z_initfirst=yes],
1465 [AC_MSG_ERROR(linker with -z initfirst support required)])
1467 # Add-on fragments can set these for other machines.
1468 libc_commonpagesize=${libc_commonpagesize:-no}
1469 libc_relro_required=${libc_relro_required:-no}
1470 case "$base_machine" in
1471 i[[34567]]86 | x86_64 | powerpc* | s390*)
1472 libc_commonpagesize=0x1000
1473 libc_relro_required=yes
1476 libc_commonpagesize=0x2000
1477 libc_relro_required=yes
1481 if test $libc_commonpagesize != no; then
1482 AC_CACHE_CHECK(for -z relro option,
1483 libc_cv_z_relro, [dnl
1485 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1486 int _start (void) { return 42; }
1487 extern void _exit (int);
1488 /* Since these pointers are const, they should go in rodata.
1489 Since they refer to functions that have to be resolved by
1490 dynamic linking, they should instead go in RELRO data. */
1491 const void *const relro[] = { &_start, &_exit, 0 };
1492 /* GNU ld fails to produce RELRO data when it's very small and there is no
1493 normal writable data following it, or if only uninitialized (.bss) data
1494 follows it, or only very small writable data. */
1495 int data[0x10000] = { 1, };
1497 cat > conftest.awk <<\EOF
1500 commonpagesize = strtonum(commonpagesize)
1502 { print "LINE:", $0 > "/dev/stderr" }
1504 vaddr = strtonum($3)
1505 memsz = strtonum($6)
1507 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1508 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1509 result = (end % commonpagesize == 0) ? "yes" : "broken"
1511 END { print result }
1513 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1514 -fPIC -shared -o conftest.so conftest.c
1515 -nostartfiles -nostdlib
1516 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1517 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1519 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1520 conftest.ph > conftest.cps
1522 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1524 if { test "x$libc_relro_required" = xyes &&
1525 test "x$libc_cv_z_relro" != xyes
1528 AC_MSG_ERROR(linker with -z relro support required)
1531 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1534 AC_CACHE_CHECK(for -Bgroup option,
1535 libc_cv_Bgroup, [dnl
1536 cat > conftest.c <<EOF
1537 int _start (void) { return 42; }
1539 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1540 -fPIC -shared -o conftest.so conftest.c
1541 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1548 AC_SUBST(libc_cv_Bgroup)
1551 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1552 libc_cv_as_noexecstack, [dnl
1553 cat > conftest.c <<EOF
1556 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1557 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1558 && grep .note.GNU-stack conftest.s >/dev/null \
1559 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1560 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1562 libc_cv_as_noexecstack=yes
1564 libc_cv_as_noexecstack=no
1567 if test $libc_cv_as_noexecstack = yes; then
1568 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1570 AC_SUBST(ASFLAGS_config)
1572 AC_CACHE_CHECK(for -z combreloc,
1573 libc_cv_z_combreloc, [dnl
1574 cat > conftest.c <<EOF
1575 extern int bar (int);
1577 int foo (void) { return bar (mumble); }
1579 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1580 -fPIC -shared -o conftest.so conftest.c
1581 -nostdlib -nostartfiles
1582 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1584 dnl The following test is a bit weak. We must use a tool which can test
1585 dnl cross-platform since the gcc used can be a cross compiler. Without
1586 dnl introducing new options this is not easily doable. Instead use a tool
1587 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1588 dnl look for a section named .rel.dyn.
1589 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1590 libc_cv_z_combreloc=yes
1592 libc_cv_z_combreloc=no
1595 libc_cv_z_combreloc=no
1598 if test "$libc_cv_z_combreloc" = yes; then
1599 AC_DEFINE(HAVE_Z_COMBRELOC)
1601 AC_SUBST(libc_cv_z_combreloc)
1603 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1604 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1605 AC_SUBST(libc_cv_z_execstack)
1607 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1608 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1611 AC_SUBST(libc_cv_fpie)
1613 AC_CACHE_CHECK(for --hash-style option,
1614 libc_cv_hashstyle, [dnl
1615 cat > conftest.c <<EOF
1616 int _start (void) { return 42; }
1618 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1619 -fPIC -shared -o conftest.so conftest.c
1620 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1622 libc_cv_hashstyle=yes
1624 libc_cv_hashstyle=no
1627 AC_SUBST(libc_cv_hashstyle)
1629 # The linker's default -shared behavior is good enough if it
1630 # does these things that our custom linker scripts ensure that
1631 # all allocated NOTE sections come first.
1632 if test "$use_default_link" = default; then
1633 AC_CACHE_CHECK([for sufficient default -shared layout],
1634 libc_cv_use_default_link, [dnl
1635 libc_cv_use_default_link=no
1636 cat > conftest.s <<\EOF
1637 .section .note.a,"a",%note
1642 .section .note.b,"a",%note
1648 if AC_TRY_COMMAND([dnl
1649 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1650 ac_try=`$READELF -S conftest.so | sed -n \
1652 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1658 libc_seen_a=no libc_seen_b=no
1660 while test $# -ge 2 -a "$1" = NOTE; do
1662 .note.a) libc_seen_a=yes ;;
1663 .note.b) libc_seen_b=yes ;;
1667 case "$libc_seen_a$libc_seen_b" in
1669 libc_cv_use_default_link=yes
1672 echo >&AS_MESSAGE_LOG_FD "\
1673 $libc_seen_a$libc_seen_b from:
1679 use_default_link=$libc_cv_use_default_link
1682 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1683 if libc_cv_output_format=`
1684 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1688 libc_cv_output_format=
1690 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1691 AC_SUBST(libc_cv_output_format)
1693 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1694 cat > conftest.c <<EOF
1697 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1698 conftest.c 1>&AS_MESSAGE_LOG_FD])
1700 libc_cv_fno_toplevel_reorder=yes
1702 libc_cv_fno_toplevel_reorder=no
1705 if test $libc_cv_fno_toplevel_reorder = yes; then
1706 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1708 fno_unit_at_a_time=-fno-unit-at-a-time
1710 AC_SUBST(fno_unit_at_a_time)
1712 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1713 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1717 AC_SUBST(libc_cv_ssp)
1719 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1720 cat > conftest.c <<EOF
1722 #ifdef __GNUC_GNU_INLINE__
1723 main () { return 0;}
1728 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1729 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1731 libc_cv_gnu89_inline=yes
1733 libc_cv_gnu89_inline=no
1736 if test $libc_cv_gnu89_inline = yes; then
1737 gnu89_inline=-fgnu89-inline
1741 AC_SUBST(gnu89_inline)
1743 AC_CACHE_CHECK(whether cc puts quotes around section names,
1744 libc_cv_have_section_quotes,
1745 [cat > conftest.c <<EOF
1746 static const int foo
1747 __attribute__ ((section ("bar"))) = 1;
1749 if ${CC-cc} -S conftest.c -o conftest.s; then
1750 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1751 libc_cv_have_section_quotes=yes
1753 libc_cv_have_section_quotes=no
1756 libc_cv_have_section_quotes=unknown
1758 rm -f conftest.{c,s}
1760 if test $libc_cv_have_section_quotes = yes; then
1761 AC_DEFINE(HAVE_SECTION_QUOTES)
1764 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1766 cat > conftest.s <<EOF
1771 .weak bar; bar = foo
1773 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1774 libc_cv_asm_weak_directive=yes
1776 libc_cv_asm_weak_directive=no
1780 if test $libc_cv_asm_weak_directive = no; then
1781 AC_CACHE_CHECK(for assembler .weakext directive,
1782 libc_cv_asm_weakext_directive,
1784 cat > conftest.s <<EOF
1793 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1794 libc_cv_asm_weakext_directive=yes
1796 libc_cv_asm_weakext_directive=no
1802 if test $libc_cv_asm_weak_directive = yes; then
1803 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1804 elif test $libc_cv_asm_weakext_directive = yes; then
1805 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1808 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1810 sparc/sparc64*) cfi_offset=2047;;
1813 cat > conftest.s <<EOF
1815 .type func,%function
1819 .cfi_rel_offset 1, $cfi_offset
1822 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1823 libc_cv_asm_cfi_directives=yes
1825 libc_cv_asm_cfi_directives=no
1828 if test $libc_cv_asm_cfi_directives = yes; then
1829 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1832 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1833 cat > conftest.c <<\EOF
1838 dnl No \ in command here because it ends up inside ''.
1839 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1840 -nostdlib -nostartfiles -Wl,--no-whole-archive
1841 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1842 libc_cv_ld_no_whole_archive=yes
1844 libc_cv_ld_no_whole_archive=no
1847 if test $libc_cv_ld_no_whole_archive = no; then
1848 AC_MSG_ERROR([support for --no-whole-archive is needed])
1851 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1852 cat > conftest.c <<\EOF
1857 dnl No \ in command here because it ends up inside ''.
1858 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1859 -nostdlib -nostartfiles -fexceptions
1860 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1861 libc_cv_gcc_exceptions=yes
1863 libc_cv_gcc_exceptions=no
1866 if test $libc_cv_gcc_exceptions = yes; then
1867 exceptions=-fexceptions
1869 AC_SUBST(exceptions)dnl
1871 if test "$host_cpu" = powerpc ; then
1872 # Check for a bug present in at least versions 2.8.x of GCC
1873 # and versions 1.0.x of EGCS.
1874 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1875 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1876 libc_cv_c_asmcr0_bug='no',
1877 libc_cv_c_asmcr0_bug='yes')])
1878 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1879 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1883 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1884 cat > conftest.c <<\EOF
1887 __builtin_memset (x, 0, 1000);
1891 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1893 libc_cv_gcc_builtin_memset=no
1895 libc_cv_gcc_builtin_memset=yes
1898 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1899 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1902 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1903 cat > conftest.c <<\EOF
1904 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1905 char *foo (const char *a, const char *b)
1907 return __builtin_strstr (a, b);
1911 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1913 libc_cv_gcc_builtin_redirection=yes
1915 libc_cv_gcc_builtin_redirection=no
1918 if test "$libc_cv_gcc_builtin_redirection" = no; then
1919 AC_MSG_ERROR([support for the symbol redirection needed])
1922 dnl Check whether the compiler supports the __thread keyword.
1923 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1924 [cat > conftest.c <<\EOF
1925 __thread int a = 42;
1927 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1928 libc_cv_gcc___thread=yes
1930 libc_cv_gcc___thread=no
1933 if test "$libc_cv_gcc___thread" = no; then
1934 AC_MSG_ERROR([support for the __thread keyword is required])
1937 dnl Check whether the compiler supports the tls_model attribute.
1938 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1939 cat > conftest.c <<\EOF
1940 extern __thread int a __attribute__((tls_model ("initial-exec")));
1942 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1943 libc_cv_gcc_tls_model_attr=yes
1945 libc_cv_gcc_tls_model_attr=no
1948 if test "$libc_cv_gcc_tls_model_attr" = no; then
1949 AC_MSG_ERROR([support for the tls_model attribute is required])
1952 dnl Determine how to disable generation of FMA instructions.
1953 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1954 libc_cv_cc_nofma, [dnl
1956 for opt in -ffp-contract=off -mno-fused-madd; do
1957 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1959 AC_SUBST(libc_cv_cc_nofma)
1961 if test -n "$submachine"; then
1962 AC_CACHE_CHECK([for compiler option for CPU variant],
1963 libc_cv_cc_submachine, [dnl
1964 libc_cv_cc_submachine=no
1965 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1966 LIBC_TRY_CC_OPTION([$opt], [
1967 libc_cv_cc_submachine="$opt"
1970 if test "x$libc_cv_cc_submachine" = xno; then
1971 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1974 AC_SUBST(libc_cv_cc_submachine)
1976 dnl Check whether we have the gd library available.
1977 AC_MSG_CHECKING(for libgd)
1978 if test "$with_gd" != "no"; then
1979 old_CFLAGS="$CFLAGS"
1980 CFLAGS="$CFLAGS $libgd_include"
1981 old_LDFLAGS="$LDFLAGS"
1982 LDFLAGS="$LDFLAGS $libgd_ldflags"
1984 LIBS="$LIBS -lgd -lpng -lz -lm"
1985 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1986 CFLAGS="$old_CFLAGS"
1987 LDFLAGS="$old_LDFLAGS"
1992 AC_MSG_RESULT($LIBGD)
1996 if test x$with_selinux = xno ; then
1999 # See if we have the SELinux library
2000 AC_CHECK_LIB(selinux, is_selinux_enabled,
2001 have_selinux=yes, have_selinux=no)
2002 # See if we have the SELinux header with the NSCD permissions in it.
2003 if test x$have_selinux = xyes ; then
2004 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
2005 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
2006 [#ifdef NSCD__SHMEMHOST
2009 #error NSCD__SHMEMHOST not defined
2011 have_selinux=yes, have_selinux=no)
2012 AC_MSG_RESULT($have_selinux)
2015 if test x$with_selinux = xyes ; then
2016 if test x$have_selinux = xno ; then
2017 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
2021 # Check if we're building with SELinux support.
2022 if test "x$have_selinux" = xyes; then
2023 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
2025 # See if we have the libaudit library
2026 AC_CHECK_LIB(audit, audit_log_user_avc_message,
2027 have_libaudit=yes, have_libaudit=no)
2028 if test "x$have_libaudit" = xyes; then
2029 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2031 AC_SUBST(have_libaudit)
2033 # See if we have the libcap library
2034 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2035 if test "x$have_libcap" = xyes; then
2036 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2038 AC_SUBST(have_libcap)
2040 AC_SUBST(have_selinux)
2042 dnl check for the size of 'long double'.
2043 AC_CHECK_SIZEOF(long double, 0)
2044 sizeof_long_double=$ac_cv_sizeof_long_double
2045 AC_SUBST(sizeof_long_double)
2048 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2049 dnl Since we are building the implementations of the fortified functions here,
2050 dnl having the macro defined interacts very badly.
2051 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2052 [AC_TRY_COMPILE([], [
2053 #ifdef _FORTIFY_SOURCE
2056 [libc_cv_predef_fortify_source=no],
2057 [libc_cv_predef_fortify_source=yes])])
2058 if test $libc_cv_predef_fortify_source = yes; then
2059 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2063 dnl Check for silly hacked compilers inserting -fstack-protector.
2064 dnl This breaks badly for the early startup code we compile, since
2065 dnl the compiled code can refer to a magic machine-dependent location
2066 dnl for the canary value before we have sufficient setup for that to
2067 dnl work. It's also questionable to build all of libc with this flag
2068 dnl even when you're doing that for most applications you build, since
2069 dnl libc's code is so heavily-used and performance-sensitive. If we
2070 dnl ever really want to make that work, it should be enabled explicitly
2071 dnl in the libc build, not inherited from implicit compiler settings.
2072 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2073 libc_cv_predef_stack_protector, [
2074 AC_TRY_COMPILE([extern void foobar (char *);],
2075 [char large_array[2048]; foobar (large_array);], [
2076 libc_undefs=`$NM -u conftest.o |
2077 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2078 2>&AS_MESSAGE_LOG_FD` || {
2079 AC_MSG_ERROR([confusing output from $NM -u])
2081 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2082 # On some architectures, there are architecture-specific undefined
2083 # symbols (resolved by the linker), so filter out unknown symbols.
2084 # This will fail to produce the correct result if the compiler
2085 # defaults to -fstack-protector but this produces an undefined symbol
2086 # other than __stack_chk_fail. However, compilers like that have not
2087 # been encountered in practice.
2088 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2089 case "$libc_undefs" in
2090 foobar) libc_cv_predef_stack_protector=no ;;
2092 foobar') libc_cv_predef_stack_protector=yes ;;
2093 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2095 [AC_MSG_ERROR([test compilation failed])])
2098 if test $libc_cv_predef_stack_protector = yes; then
2099 libc_extra_cflags=-fno-stack-protector
2101 AC_SUBST(libc_extra_cflags)
2103 ### End of automated tests.
2104 ### Now run sysdeps configure fragments.
2106 # They also can set these variables.
2108 ldd_rewrite_script=no
2109 libc_cv_sysconfdir=$sysconfdir
2110 libc_cv_localstatedir=$localstatedir
2111 libc_cv_gcc_unwind_find_fde=no
2114 # Iterate over all the sysdep directories we will use, running their
2115 # configure fragments.
2116 for dir in $sysnames; do
2119 *) dest=$srcdir/$dir ;;
2121 if test -r $dest/configure; then
2122 AC_MSG_RESULT(running configure fragment for $dir)
2127 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2128 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2130 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2132 # A sysdeps configure fragment can reset this if IFUNC is not actually
2133 # usable even though the assembler knows how to generate the symbol type.
2134 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2135 AC_DEFINE(HAVE_IFUNC)
2138 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2139 # configure fragment can override the value to prevent this AC_DEFINE.
2141 if test "x$use_nscd" != xno; then
2142 AC_DEFINE([USE_NSCD])
2144 if test "x$build_nscd" = xdefault; then
2145 build_nscd=$use_nscd
2148 # Test for old glibc 2.0.x headers so that they can be removed properly
2149 # Search only in includedir.
2150 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2151 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2153 old_glibc_headers=yes
2155 old_glibc_headers=no
2157 AC_MSG_RESULT($old_glibc_headers)
2158 if test ${old_glibc_headers} = yes; then
2159 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2160 AC_MSG_WARN(*** be removed.)
2162 AC_SUBST(old_glibc_headers)
2164 AC_SUBST(libc_cv_slibdir)
2165 AC_SUBST(libc_cv_rtlddir)
2166 AC_SUBST(libc_cv_localedir)
2167 AC_SUBST(libc_cv_sysconfdir)
2168 AC_SUBST(libc_cv_localstatedir)
2169 AC_SUBST(libc_cv_rootsbindir)
2170 AC_SUBST(libc_cv_forced_unwind)
2172 if test x$use_ldconfig = xyes; then
2173 AC_DEFINE(USE_LDCONFIG)
2175 AC_SUBST(use_ldconfig)
2176 AC_SUBST(ldd_rewrite_script)
2181 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2182 [libc_cv_pic_default=yes
2183 cat > conftest.c <<EOF
2184 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2185 # error PIC is default.
2188 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2189 libc_cv_pic_default=no
2192 AC_SUBST(libc_cv_pic_default)
2195 AC_SUBST(static_nss)
2199 dnl See sysdeps/mach/configure.in for this variable.
2200 AC_SUBST(mach_interface_list)
2202 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2203 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2207 AC_CONFIG_FILES([config.make Makefile])
2208 AC_CONFIG_COMMANDS([default],[[
2209 case $CONFIG_FILES in *config.make*)
2210 echo "$config_vars" >> config.make;;
2212 test -d bits || mkdir bits]],[[config_vars='$config_vars']])