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 AC_CHECK_TOOL(READELF, readelf, false)
55 # We need the C++ compiler only for testing.
57 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
58 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
60 # Default, dynamic case.
61 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
62 [libc_cv_cxx_link_ok=yes],
63 [libc_cv_cxx_link_ok=no])
65 old_LDFLAGS="$LDFLAGS"
66 LDFLAGS="$LDFLAGS -static"
67 AC_LINK_IFELSE([AC_LANG_SOURCE([
73 std::cout << "Hello, world!";
78 [libc_cv_cxx_link_ok=no])
79 LDFLAGS="$old_LDFLAGS"
81 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
83 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
84 AC_MSG_ERROR([you must configure in a separate build directory])
87 # This will get text that should go into config.make.
90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
92 AC_HELP_STRING([--with-gd=DIR],
93 [find libgd include dir and library with prefix DIR]),
97 *) libgd_include="-I$withval/include"
98 libgd_ldflags="-L$withval/lib" ;;
101 AC_ARG_WITH([gd-include],
102 AC_HELP_STRING([--with-gd-include=DIR],
103 [find libgd include files in DIR]),
105 case "$with_gd_include" in
107 *) libgd_include="-I$withval" ;;
110 AC_ARG_WITH([gd-lib],
111 AC_HELP_STRING([--with-gd-lib=DIR],
112 [find libgd library files in DIR]),
114 case "$with_gd_lib" in
116 *) libgd_ldflags="-L$withval" ;;
120 if test -n "$libgd_include"; then
121 config_vars="$config_vars
122 CFLAGS-memusagestat.c = $libgd_include"
124 if test -n "$libgd_ldflags"; then
125 config_vars="$config_vars
126 libgd-LDFLAGS = $libgd_ldflags"
129 dnl Arguments to specify presence of other packages/features.
131 AC_HELP_STRING([--with-fp],
132 [if using floating-point hardware @<:@default=yes@:>@]),
136 AC_ARG_WITH([binutils],
137 AC_HELP_STRING([--with-binutils=PATH],
138 [specify location of binutils (as and ld)]),
139 [path_binutils=$withval],
141 AC_ARG_WITH([selinux],
142 AC_HELP_STRING([--with-selinux],
143 [if building with SELinux support]),
144 [with_selinux=$withval],
147 AC_ARG_WITH([headers],
148 AC_HELP_STRING([--with-headers=PATH],
149 [location of system headers to use
150 (for example /usr/src/linux/include)
151 @<:@default=compiler default@:>@]),
152 [sysheaders=$withval],
156 AC_SUBST(use_default_link)
157 AC_ARG_WITH([default-link],
158 AC_HELP_STRING([--with-default-link],
159 [do not use explicit linker scripts]),
160 [use_default_link=$withval],
161 [use_default_link=default])
163 AC_ARG_ENABLE([sanity-checks],
164 AC_HELP_STRING([--disable-sanity-checks],
165 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
166 [enable_sanity=$enableval],
169 AC_ARG_ENABLE([shared],
170 AC_HELP_STRING([--enable-shared],
171 [build shared library @<:@default=yes if GNU ld@:>@]),
174 AC_ARG_ENABLE([profile],
175 AC_HELP_STRING([--enable-profile],
176 [build profiled library @<:@default=no@:>@]),
177 [profile=$enableval],
179 AC_ARG_ENABLE([timezone-tools],
180 AC_HELP_STRING([--disable-timezone-tools],
181 [do not install timezone tools @<:@default=install@:>@]),
182 [enable_timezone_tools=$enableval],
183 [enable_timezone_tools=yes])
184 AC_SUBST(enable_timezone_tools)
186 AC_ARG_ENABLE([hardcoded-path-in-tests],
187 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
188 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
189 [hardcoded_path_in_tests=$enableval],
190 [hardcoded_path_in_tests=no])
191 AC_SUBST(hardcoded_path_in_tests)
193 AC_ARG_ENABLE([stackguard-randomization],
194 AC_HELP_STRING([--enable-stackguard-randomization],
195 [initialize __stack_chk_guard canary with a random number at program start]),
196 [enable_stackguard_randomize=$enableval],
197 [enable_stackguard_randomize=no])
198 if test "$enable_stackguard_randomize" = yes; then
199 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
202 AC_ARG_ENABLE([lock-elision],
203 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
204 [Enable lock elision for pthread mutexes by default]),
205 [enable_lock_elision=$enableval],
206 [enable_lock_elision=no])
207 AC_SUBST(enable_lock_elision)
208 if test "$enable_lock_elision" = yes ; then
209 AC_DEFINE(ENABLE_LOCK_ELISION)
212 dnl Generic infrastructure for drop-in additions to libc.
213 AC_ARG_ENABLE([add-ons],
214 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
215 [configure and build add-ons in DIR1,DIR2,...
216 search for add-ons if no parameter given]),
217 , [enable_add_ons=yes])
219 AC_ARG_ENABLE([hidden-plt],
220 AC_HELP_STRING([--disable-hidden-plt],
221 [do not hide internal function calls to avoid PLT]),
224 if test "x$hidden" = xno; then
228 AC_ARG_ENABLE([bind-now],
229 AC_HELP_STRING([--enable-bind-now],
230 [disable lazy relocations in DSOs]),
231 [bindnow=$enableval],
235 dnl On some platforms we cannot use dynamic loading. We must provide
236 dnl static NSS modules.
237 AC_ARG_ENABLE([static-nss],
238 AC_HELP_STRING([--enable-static-nss],
239 [build static NSS modules @<:@default=no@:>@]),
240 [static_nss=$enableval],
242 dnl Enable static NSS also if we build no shared objects.
243 if test x"$static_nss" = xyes || test x"$shared" = xno; then
245 AC_DEFINE(DO_STATIC_NSS)
248 AC_ARG_ENABLE([force-install],
249 AC_HELP_STRING([--disable-force-install],
250 [don't force installation of files from this package, even if they are older than the installed files]),
251 [force_install=$enableval],
253 AC_SUBST(force_install)
255 AC_ARG_ENABLE([maintainer-mode],
256 AC_HELP_STRING([--enable-maintainer-mode],
257 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
258 [maintainer=$enableval],
261 dnl On some platforms we allow dropping compatibility with all kernel
263 AC_ARG_ENABLE([kernel],
264 AC_HELP_STRING([--enable-kernel=VERSION],
265 [compile for compatibility with kernel not older than VERSION]),
266 [minimum_kernel=$enableval],
268 dnl Prevent unreasonable values.
269 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
270 # Better nothing than this.
273 if test "$minimum_kernel" = current; then
274 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
278 dnl For the development we sometimes want gcc to issue even more warnings.
279 dnl This is not the default since many of the extra warnings are not
281 AC_ARG_ENABLE([all-warnings],
282 AC_HELP_STRING([--enable-all-warnings],
283 [enable all useful warnings gcc can issue]),
284 [all_warnings=$enableval],
286 AC_SUBST(all_warnings)
288 AC_ARG_ENABLE([werror],
289 AC_HELP_STRING([--disable-werror],
290 [do not build with -Werror]),
291 [enable_werror=$enableval],
293 AC_SUBST(enable_werror)
295 AC_ARG_ENABLE([multi-arch],
296 AC_HELP_STRING([--enable-multi-arch],
297 [enable single DSO with optimizations for multiple architectures]),
298 [multi_arch=$enableval],
299 [multi_arch=default])
301 AC_ARG_ENABLE([nss-crypt],
302 AC_HELP_STRING([--enable-nss-crypt],
303 [enable libcrypt to use nss]),
304 [nss_crypt=$enableval],
306 if test x$nss_crypt = xyes; then
307 nss_includes=-I$(nss-config --includedir 2>/dev/null)
308 if test $? -ne 0; then
309 AC_MSG_ERROR([cannot find include directory with nss-config])
312 CFLAGS="$CFLAGS $nss_includes"
313 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
315 #include <nsslowhash.h>
316 void f (void) { NSSLOW_Init (); }])],
317 libc_cv_nss_crypt=yes,
319 cannot find NSS headers with lowlevel hash function interfaces]))
321 LIBS="$LIBS -lfreebl3"
322 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
324 #include <nsslowhash.h>],
326 libc_cv_nss_crypt=yes,
328 cannot link program using lowlevel NSS hash functions]))
334 AC_SUBST(libc_cv_nss_crypt)
337 AC_ARG_ENABLE([obsolete-rpc],
338 AC_HELP_STRING([--enable-obsolete-rpc],
339 [build and install the obsolete RPC code for link-time usage]),
340 [link_obsolete_rpc=$enableval],
341 [link_obsolete_rpc=no])
342 AC_SUBST(link_obsolete_rpc)
344 if test "$link_obsolete_rpc" = yes; then
345 AC_DEFINE(LINK_OBSOLETE_RPC)
348 AC_ARG_ENABLE([systemtap],
349 [AS_HELP_STRING([--enable-systemtap],
350 [enable systemtap static probe points @<:@default=no@:>@])],
351 [systemtap=$enableval],
353 if test "x$systemtap" != xno; then
354 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
356 CFLAGS="-std=gnu99 $CFLAGS"
357 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
358 void foo (int i, void *p)
360 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
361 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
362 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
363 CFLAGS="$old_CFLAGS"])
364 if test $libc_cv_sdt = yes; then
365 AC_DEFINE([USE_STAP_PROBE])
366 elif test "x$systemtap" != xauto; then
367 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
371 AC_ARG_ENABLE([build-nscd],
372 [AS_HELP_STRING([--disable-build-nscd],
373 [disable building and installing the nscd daemon])],
374 [build_nscd=$enableval],
375 [build_nscd=default])
378 # Note the use of $use_nscd is near the bottom of the file.
379 AC_ARG_ENABLE([nscd],
380 [AS_HELP_STRING([--disable-nscd],
381 [library functions will not contact the nscd daemon])],
382 [use_nscd=$enableval],
385 AC_ARG_ENABLE([pt_chown],
386 [AS_HELP_STRING([--enable-pt_chown],
387 [Enable building and installing pt_chown])],
388 [build_pt_chown=$enableval],
390 AC_SUBST(build_pt_chown)
391 if test "$build_pt_chown" = yes; then
392 AC_DEFINE(HAVE_PT_CHOWN)
395 # The abi-tags file uses a fairly simplistic model for name recognition that
396 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
397 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
398 # This doesn't get used much beyond that, so it's fairly safe.
403 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
407 AC_ARG_ENABLE([mathvec],
408 [AS_HELP_STRING([--enable-mathvec],
409 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
410 [build_mathvec=$enableval],
411 [build_mathvec=notset])
413 # We keep the original values in `$config_*' and never modify them, so we
414 # can write them unchanged into config.make. Everything else uses
415 # $machine, $vendor, and $os, and changes them whenever convenient.
416 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
418 # Don't allow vendor == "unknown"
419 test "$config_vendor" = unknown && config_vendor=
420 config_os="`echo $config_os | sed 's/^unknown-//'`"
422 # Some configurations imply other options.
425 # The configure fragment of an add-on port can modify these to supplement
426 # or override the table in the case statement below. No fragment should
427 # ever change the config_* variables, however.
428 machine=$config_machine
429 vendor=$config_vendor
435 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
438 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
440 *) submachine="$withval" ;;
444 # An preconfigure script can set this when it wants to disable the sanity
448 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
449 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
451 dnl Having this here, though empty, makes sure that if add-ons' fragments
452 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
453 dnl our AC_OUTPUT will actually use it.
456 case "$enable_add_ons" in
459 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
460 sed 's@/[[^/]]*$@@' | sort | uniq`
461 add_ons_automatic=yes
463 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
464 add_ons_automatic=no ;;
470 if test x"$add_ons" != x; then
471 for f in $add_ons; do
476 *** It seems that you're using an old \`crypt' add-on. crypt is now
477 *** part of glibc and using the old add-on will not work with this
478 *** release. Start again with fresh sources and without the old
479 *** \`crypt' add-on.])
483 *** It seems that you're using an old \`localedata' add-on. localedata
484 *** is now part of glibc and using the old add-on will not work with
485 *** this release. Start again with fresh sources and without the old
486 *** \`localedata' add-on.])
491 # Now source each add-on's configure fragment.
492 # The fragments can use $srcdir/$libc_add_on to find themselves,
493 # and test $add_ons_automatic to see if they were explicitly requested.
494 # A fragment can clear (or even change) $libc_add_on to affect
495 # whether it goes into the list to be actually used in the build.
497 for libc_add_on in $add_ons; do
498 # Test whether such a directory really exists.
499 # It can be absolute, or relative to $srcdir, or relative to the build dir.
500 case "$libc_add_on" in
502 libc_add_on_srcdir=$libc_add_on
505 test -d "$srcdir/$libc_add_on" || {
506 if test -d "$libc_add_on"; then
507 libc_add_on="`pwd`/$libc_add_on"
509 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
512 libc_add_on_srcdir=$srcdir/$libc_add_on
516 libc_add_on_frag=$libc_add_on_srcdir/configure
517 libc_add_on_canonical=
518 libc_add_on_config_subdirs=
519 if test -r "$libc_add_on_frag"; then
520 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
521 libc_add_on_canonical=unknown
523 . "$libc_add_on_frag"
524 test -z "$libc_add_on" || {
525 configured_add_ons="$configured_add_ons $libc_add_on"
526 if test "x$libc_add_on_canonical" = xunknown; then
527 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
529 for d in $libc_add_on_subdirs; do
530 case "$libc_add_on" in
531 /*) subdir_srcdir="$libc_add_on" ;;
532 *) subdir_srcdir="\$(..)$libc_add_on" ;;
536 d="${libc_add_on_canonical:-$libc_add_on}"
542 subdir_srcdir="$subdir_srcdir/$d"
545 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
546 add_on_subdirs="$add_on_subdirs $d"
547 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
548 $d-srcdir = $subdir_srcdir"
550 for d in $libc_add_on_config_subdirs; do
553 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
555 if test ! -d "$libc_add_on_srcdir/$d"; then
556 AC_MSG_ERROR(fragment wants to configure missing directory $d)
558 case "$libc_add_on" in
560 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
562 subdirs="$subdirs $libc_add_on/$d"
566 if test -n "$libc_add_on"; then
567 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
568 use_add_ons="$use_add_ons $libc_add_on"
569 add_ons_pfx="$add_ons_pfx $libc_add_on/"
570 test -z "$libc_add_on_canonical" ||
571 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
574 # Use echo to strip excess whitespace.
575 add_ons="`echo $use_add_ons`"
578 AC_SUBST(add_on_subdirs)
582 ### I put this here to prevent those annoying emails from people who cannot
583 ### read and try to compile glibc on unsupported platforms. --drepper
585 ### By using the undocumented --enable-hacker-mode option for configure
586 ### one can skip this test to make the configuration not fail for unsupported
589 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
590 case "$machine-$host_os" in
594 echo "*** The GNU C library is currently not available for this platform."
595 echo "*** So far nobody cared to port it and if there is no volunteer it"
596 echo "*** might never happen. So, if you have interest to see glibc on"
597 echo "*** this platform visit"
598 echo "*** http://www.gnu.org/software/libc/porting.html"
599 echo "*** and join the group of porters"
605 # Set base_machine if not set by a preconfigure fragment.
606 test -n "$base_machine" || base_machine=$machine
607 AC_SUBST(base_machine)
609 # For the multi-arch option we need support in the assembler & linker.
610 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
611 libc_cv_ld_gnu_indirect_function, [dnl
612 cat > conftest.S <<EOF
613 .type foo,%gnu_indirect_function
626 libc_cv_ld_gnu_indirect_function=no
627 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
628 -nostartfiles -nostdlib \
629 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
630 # Do a link to see if the backend supports IFUNC relocs.
631 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
632 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
633 libc_cv_ld_gnu_indirect_function=yes
638 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
639 if test x"$multi_arch" = xyes; then
640 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
646 if test x"$multi_arch" != xno; then
647 multi_arch_d=/multiarch
650 # Compute the list of sysdep directories for this configuration.
651 # This can take a while to compute.
652 sysdep_dir=$srcdir/sysdeps
653 AC_MSG_CHECKING(sysdep dirs)
654 dnl We need to use [ and ] for other purposes for a while now.
656 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
657 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
659 test "x$base_os" != x || case "$os" in
666 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
669 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
673 o=`echo $tail | sed 's/[0-9]*$//'`
674 if test $o != $tail; then
677 # For linux-gnu, try linux-gnu, then linux.
678 o=`echo $tail | sed 's/-.*$//'`
679 if test $o != $tail; then
683 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
686 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
692 # For sparc/sparc32, try sparc/sparc32 and then sparc.
694 tail=$machine${submachine:+/$submachine}
695 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
697 # Prepend the machine's FPU directory unless --without-fp.
698 if test "$with_fp" = yes; then
703 # For each machine term, try it with and then without /multiarch.
704 for try_fpu in $maybe_fpu ''; do
705 for try_multi in $multi_arch_d ''; do
706 mach="$mach /$1$try_fpu$try_multi"
712 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
715 # Find what sysdep directories exist.
718 for b in $base ''; do
719 for m0 in $mach ''; do
720 for v in /$vendor ''; do
721 test "$v" = / && continue
722 for o in /$ostry ''; do
723 test "$o" = / && continue
724 for m in $mach ''; do
725 for d in $add_ons_pfx ''; do
726 for a in $add_ons_sfx ''; do
727 try_suffix="$m0$b$v$o$m"
728 if test -n "$try_suffix"; then
729 try_srcdir="${srcdir}/"
733 try="${d}sysdeps$try_suffix$a"
734 test -n "$enable_debug_configure" &&
735 echo "$0 [DEBUG]: try $try" >&2
736 if test -d "$try_srcdir$try"; then
737 sysnames="$sysnames $try"
738 { test -n "$o" || test -n "$b"; } && os_used=t
739 { test -n "$m" || test -n "$m0"; } && machine_used=t
741 x*/$submachine) submachine_used=t ;;
743 if test -n "$d"; then
744 case "$sysnames_add_ons" in
746 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
759 # If the assembler supports gnu_indirect_function symbol type and the
760 # architecture supports multi-arch, we enable multi-arch by default.
761 case $sysnames_add_ons$sysnames in
765 test x"$multi_arch" = xdefault && multi_arch=no
768 if test x"$multi_arch" != xno; then
769 AC_DEFINE(USE_MULTIARCH)
773 if test -z "$os_used" && test "$os" != none; then
774 AC_MSG_ERROR(Operating system $os is not supported.)
776 if test -z "$machine_used" && test "$machine" != none; then
777 AC_MSG_ERROR(The $machine is not supported.)
779 if test -z "$submachine_used" && test -n "$submachine"; then
780 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
784 # We have now validated the configuration.
786 # Expand the list of system names into a full list of directories
787 # from each element's parent name and Implies file (if present).
790 while test $# -gt 0; do
794 case " $names " in *" $name "*)
795 # Already in the list.
799 # Report each name as we discover it, so there is no long pause in output.
800 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
802 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
806 *) xsrcdir=$srcdir/ ;;
808 test -n "$enable_debug_configure" &&
809 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
811 for implies_file in Implies Implies-before Implies-after; do
812 implies_type=`echo $implies_file | sed s/-/_/`
813 eval ${implies_type}=
814 if test -f $xsrcdir$name/$implies_file; then
815 # Collect more names from the `Implies' file (removing comments).
816 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
817 for x in $implied_candidate; do
819 if test -d $xsrcdir$name_base/$x; then
820 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
823 for d in $add_ons_pfx ''; do
827 *) try_srcdir=$srcdir/ ;;
829 test -n "$enable_debug_configure" &&
830 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
831 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
833 eval "${implies_type}=\"\$${implies_type} \$try\""
835 case "$sysnames_add_ons" in
837 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
841 if test $found = no; then
842 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
848 # Add NAME to the list of names.
851 # Find the parent of NAME, using the empty string if it has none.
853 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
856 test -n "$enable_debug_configure" &&
857 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
858 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
860 # Add the names implied by NAME, and NAME's parent (if it has one), to
861 # the list of names to be processed (the argument list). We prepend the
862 # implied names to the list and append the parent. We want implied
863 # directories to come before further directories inferred from the
864 # configuration components; this ensures that for sysv4, unix/common
865 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
867 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
868 test -n "$sysnames" && set $sysnames
871 # Add the default directories.
872 default_sysnames="sysdeps/generic"
873 sysnames="$names $default_sysnames"
875 # The other names were emitted during the scan.
876 AC_MSG_RESULT($default_sysnames)
878 # Collect the list of add-ons that supply partial sysdeps trees.
880 for add_on in $add_ons; do
883 *) xsrcdir="$srcdir/" ;;
886 test -d "$xsrcdir$add_on/sysdeps" || {
887 case "$configured_add_ons " in
890 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
896 sysdeps_add_ons="$sysdeps_add_ons $add_on"
897 case "$sysnames_add_ons" in
900 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
905 for d in $sysnames; do
907 $add_on/sysdeps/*) ;;
910 (cd "$xsrcdir$d" && for f in *[[!~]]; do
914 test -d "$ff" || { test -e "$ff" && exit 88; }
918 test -d "$f" || { test -e "$f" && exit 88; }
922 if test $? -eq 88; then
927 if test $found = no; then
928 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
931 AC_SUBST(sysdeps_add_ons)
937 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
938 # The makefiles need to use a different form to find it in $srcdir.
939 INSTALL='\$(..)./scripts/install-sh -c'
945 # Accept binutils 2.22 or newer.
946 AC_CHECK_PROG_VER(AS, $AS, --version,
947 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
948 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
949 AS=: critic_missing="$critic_missing as")
950 AC_CHECK_PROG_VER(LD, $LD, --version,
951 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
952 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
953 LD=: critic_missing="$critic_missing ld")
955 # These programs are version sensitive.
957 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
958 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
959 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
961 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
962 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
963 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
964 MSGFMT=: aux_missing="$aux_missing msgfmt")
965 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
966 [GNU texinfo.* \([0-9][0-9.]*\)],
967 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
968 MAKEINFO=: aux_missing="$aux_missing makeinfo")
969 AC_CHECK_PROG_VER(SED, sed, --version,
970 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
971 [3.0[2-9]*|3.[1-9]*|[4-9]*],
972 SED=: aux_missing="$aux_missing sed")
973 AC_CHECK_PROG_VER(AWK, gawk, --version,
974 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
975 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
977 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
979 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
980 #error insufficient compiler
982 [libc_cv_compiler_ok=yes],
983 [libc_cv_compiler_ok=no])])
984 AS_IF([test $libc_cv_compiler_ok != yes],
985 [critic_missing="$critic_missing compiler"])
987 AC_CHECK_TOOL(NM, nm, false)
989 if test "x$maintainer" = "xyes"; then
990 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
992 xno|x|x:) AUTOCONF=no ;;
995 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
996 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
997 libc_cv_autoconf_works=yes
999 libc_cv_autoconf_works=no
1001 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1004 if test "x$AUTOCONF" = xno; then
1005 aux_missing="$aux_missing autoconf"
1011 test -n "$critic_missing" && AC_MSG_ERROR([
1012 *** These critical programs are missing or too old:$critic_missing
1013 *** Check the INSTALL file for required versions.])
1015 test -n "$aux_missing" && AC_MSG_WARN([
1016 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1017 *** some features will be disabled.
1018 *** Check the INSTALL file for required versions.])
1020 # if using special system headers, find out the compiler's sekrit
1021 # header directory and add that to the list. NOTE: Only does the right
1022 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1023 if test -n "$sysheaders"; then
1024 SYSINCLUDES=-nostdinc
1025 for d in include include-fixed; do
1026 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1027 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1029 SYSINCLUDES="$SYSINCLUDES \
1030 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1031 if test -n "$CXX"; then
1033 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1034 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1035 test "x$cxxheaders" != x &&
1036 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1040 AC_SUBST(SYSINCLUDES)
1041 AC_SUBST(CXX_SYSINCLUDES)
1043 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1044 # since this would lead to problems installing/building glibc.
1045 # LD_LIBRARY_PATH contains the current directory if one of the following
1047 # - one of the terminals (":" and ";") is the first or last sign
1048 # - two terminals occur directly after each other
1049 # - the path contains an element with a dot in it
1050 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1052 case ${LD_LIBRARY_PATH} in
1053 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1054 ld_library_path_setting="contains current directory"
1057 ld_library_path_setting="ok"
1061 AC_MSG_RESULT($ld_library_path_setting)
1062 if test "$ld_library_path_setting" != "ok"; then
1064 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1065 *** building glibc. Please change the environment variable
1066 *** and run configure again.])
1069 AC_PATH_PROG(BASH_SHELL, bash, no)
1071 AC_PATH_PROG(PERL, perl, no)
1072 if test "$PERL" != no &&
1073 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1076 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1077 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1078 AC_CHECK_PROG_VER(BISON, bison, --version,
1079 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1080 [2.7*|[3-9].*|[1-9][0-9]*],
1083 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1084 cat > conftest.s <<EOF
1087 .set glibc_conftest_frobozz,foo
1088 .globl glibc_conftest_frobozz
1090 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1091 # (but it doesn't work), so we must do a linking check to be sure.
1092 cat > conftest1.c <<\EOF
1093 extern int glibc_conftest_frobozz;
1094 void _start() { glibc_conftest_frobozz = 1; }
1096 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1097 -nostartfiles -nostdlib \
1098 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1099 libc_cv_asm_set_directive=yes
1101 libc_cv_asm_set_directive=no
1104 if test $libc_cv_asm_set_directive = yes; then
1105 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1108 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1109 libc_cv_asm_protected_directive, [dnl
1110 cat > conftest.s <<EOF
1116 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1117 libc_cv_asm_protected_directive=yes
1119 AC_MSG_ERROR(assembler support for symbol visibility is required)
1123 if test $libc_cv_asm_protected_directive = yes; then
1124 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1125 libc_cv_visibility_attribute,
1126 [cat > conftest.c <<EOF
1127 int foo __attribute__ ((visibility ("hidden"))) = 1;
1128 int bar __attribute__ ((visibility ("protected"))) = 1;
1130 libc_cv_visibility_attribute=no
1131 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1132 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1133 if grep '\.protected.*bar' conftest.s >/dev/null; then
1134 libc_cv_visibility_attribute=yes
1138 rm -f conftest.{c,s}
1140 if test $libc_cv_visibility_attribute != yes; then
1141 AC_MSG_ERROR(compiler support for visibility attribute is required)
1145 if test $libc_cv_visibility_attribute = yes; then
1146 AC_CACHE_CHECK(linker support for protected data symbol,
1147 libc_cv_protected_data,
1148 [cat > conftest.c <<EOF
1149 int bar __attribute__ ((visibility ("protected"))) = 1;
1151 libc_cv_protected_data=no
1152 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
1153 cat > conftest.c <<EOF
1155 int main (void) { return bar; }
1157 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
1158 libc_cv_protected_data=yes
1164 libc_cv_protected_data=no
1166 AC_SUBST(libc_cv_protected_data)
1168 if test $libc_cv_visibility_attribute = yes; then
1169 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1170 libc_cv_broken_visibility_attribute,
1171 [cat > conftest.c <<EOF
1173 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1174 int bar (int x) { return x; }
1176 libc_cv_broken_visibility_attribute=yes
1177 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1179 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1181 libc_cv_broken_visibility_attribute=no
1184 rm -f conftest.c conftest.s
1186 if test $libc_cv_broken_visibility_attribute = yes; then
1187 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1191 AC_CACHE_CHECK(for broken __attribute__((alias())),
1192 libc_cv_broken_alias_attribute,
1193 [cat > conftest.c <<EOF
1194 extern int foo (int x) __asm ("xyzzy");
1195 int bar (int x) { return x; }
1196 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1198 extern __typeof (dfoo) dfoo __asm ("abccb");
1201 libc_cv_broken_alias_attribute=yes
1202 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1203 if grep 'xyzzy' conftest.s >/dev/null &&
1204 grep 'abccb' conftest.s >/dev/null; then
1205 libc_cv_broken_alias_attribute=no
1208 rm -f conftest.c conftest.s
1210 if test $libc_cv_broken_alias_attribute = yes; then
1211 AC_MSG_ERROR(working alias attribute support required)
1214 if test $libc_cv_visibility_attribute = yes; then
1215 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1216 libc_cv_have_sdata_section,
1217 [echo "int i;" > conftest.c
1218 libc_cv_have_sdata_section=no
1219 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1220 | grep '\.sdata' >/dev/null; then
1221 libc_cv_have_sdata_section=yes
1223 rm -f conftest.c conftest.so
1225 if test $libc_cv_have_sdata_section = yes; then
1226 AC_DEFINE(HAVE_SDATA_SECTION)
1230 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1231 libc_cv_initfini_array, [dnl
1232 LIBC_TRY_LINK_STATIC([
1233 int foo (void) { return 1; }
1234 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1236 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1237 libc_cv_initfini_array=yes
1239 libc_cv_initfini_array=no
1241 [libc_cv_initfini_array=no])
1243 if test $libc_cv_initfini_array != yes; then
1244 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1247 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1248 libc_cv_ctors_header, [dnl
1249 libc_cv_ctors_header=yes
1250 LIBC_TRY_LINK_STATIC([
1251 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1252 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1255 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1256 { gsub(/\@<:@ */, "@<:@") }
1257 $2 == ".ctors" || $2 == ".dtors" {
1258 size = strtonum("0x" $6)
1259 align = strtonum("0x" $NF)
1261 stub@<:@$2@:>@ = size == align * 2
1264 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1265 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1266 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1268 '], [libc_cv_ctors_header=no])
1270 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1273 if test $libc_cv_ctors_header = no; then
1274 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1277 AC_CACHE_CHECK(for libunwind-support in compiler,
1278 libc_cv_cc_with_libunwind, [
1279 cat > conftest.c <<EOF
1280 int main (void) { return 0; }
1282 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1283 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1284 libc_cv_cc_with_libunwind=yes
1286 libc_cv_cc_with_libunwind=no
1289 AC_SUBST(libc_cv_cc_with_libunwind)
1290 if test $libc_cv_cc_with_libunwind = yes; then
1291 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1294 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1295 [libc_cv_z_nodelete=yes],
1296 [AC_MSG_ERROR(linker with -z nodelete support required)])
1298 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1299 [libc_cv_z_nodlopen=yes],
1300 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1302 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1303 [libc_cv_z_initfirst=yes],
1304 [AC_MSG_ERROR(linker with -z initfirst support required)])
1307 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1308 libc_cv_as_noexecstack, [dnl
1309 cat > conftest.c <<EOF
1312 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1313 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1314 && grep .note.GNU-stack conftest.s >/dev/null \
1315 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1316 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1318 libc_cv_as_noexecstack=yes
1320 libc_cv_as_noexecstack=no
1323 if test $libc_cv_as_noexecstack = yes; then
1324 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1326 AC_SUBST(ASFLAGS_config)
1328 AC_CACHE_CHECK(for -z combreloc,
1329 libc_cv_z_combreloc, [dnl
1330 cat > conftest.c <<EOF
1331 extern int bar (int);
1333 int foo (void) { return bar (mumble); }
1335 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1336 -fPIC -shared -o conftest.so conftest.c
1337 -nostdlib -nostartfiles
1338 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1340 dnl The following test is a bit weak. We must use a tool which can test
1341 dnl cross-platform since the gcc used can be a cross compiler. Without
1342 dnl introducing new options this is not easily doable. Instead use a tool
1343 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1344 dnl look for a section named .rel.dyn.
1345 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1346 libc_cv_z_combreloc=yes
1348 libc_cv_z_combreloc=no
1351 libc_cv_z_combreloc=no
1354 if test "$libc_cv_z_combreloc" = yes; then
1355 AC_DEFINE(HAVE_Z_COMBRELOC)
1357 AC_SUBST(libc_cv_z_combreloc)
1359 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1360 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1361 AC_SUBST(libc_cv_z_execstack)
1363 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1364 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1367 AC_SUBST(libc_cv_fpie)
1369 AC_CACHE_CHECK(for --hash-style option,
1370 libc_cv_hashstyle, [dnl
1371 cat > conftest.c <<EOF
1372 int _start (void) { return 42; }
1374 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1375 -fPIC -shared -o conftest.so conftest.c
1376 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1378 libc_cv_hashstyle=yes
1380 libc_cv_hashstyle=no
1383 AC_SUBST(libc_cv_hashstyle)
1385 # The linker's default -shared behavior is good enough if it
1386 # does these things that our custom linker scripts ensure that
1387 # all allocated NOTE sections come first.
1388 if test "$use_default_link" = default; then
1389 AC_CACHE_CHECK([for sufficient default -shared layout],
1390 libc_cv_use_default_link, [dnl
1391 libc_cv_use_default_link=no
1392 cat > conftest.s <<\EOF
1393 .section .note.a,"a",%note
1398 .section .note.b,"a",%note
1404 if AC_TRY_COMMAND([dnl
1405 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1406 ac_try=`$READELF -S conftest.so | sed -n \
1408 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1414 libc_seen_a=no libc_seen_b=no
1416 while test $# -ge 2 -a "$1" = NOTE; do
1418 .note.a) libc_seen_a=yes ;;
1419 .note.b) libc_seen_b=yes ;;
1423 case "$libc_seen_a$libc_seen_b" in
1425 libc_cv_use_default_link=yes
1428 echo >&AS_MESSAGE_LOG_FD "\
1429 $libc_seen_a$libc_seen_b from:
1435 use_default_link=$libc_cv_use_default_link
1438 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1439 if libc_cv_output_format=`
1440 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1444 libc_cv_output_format=
1446 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1447 AC_SUBST(libc_cv_output_format)
1449 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1450 cat > conftest.c <<EOF
1453 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1454 conftest.c 1>&AS_MESSAGE_LOG_FD])
1456 libc_cv_fno_toplevel_reorder=yes
1458 libc_cv_fno_toplevel_reorder=no
1461 if test $libc_cv_fno_toplevel_reorder = yes; then
1462 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1464 fno_unit_at_a_time=-fno-unit-at-a-time
1466 AC_SUBST(fno_unit_at_a_time)
1468 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1469 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1474 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
1475 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
1476 [libc_cv_ssp_strong=yes],
1477 [libc_cv_ssp_strong=no])
1481 if test "$libc_cv_ssp_strong" = "yes"; then
1482 stack_protector="-fstack-protector-strong"
1483 elif test "$libc_cv_ssp" = "yes"; then
1484 stack_protector="-fstack-protector"
1486 AC_SUBST(stack_protector)
1488 AC_CACHE_CHECK(whether cc puts quotes around section names,
1489 libc_cv_have_section_quotes,
1490 [cat > conftest.c <<EOF
1491 static const int foo
1492 __attribute__ ((section ("bar"))) = 1;
1494 if ${CC-cc} -S conftest.c -o conftest.s; then
1495 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1496 libc_cv_have_section_quotes=yes
1498 libc_cv_have_section_quotes=no
1501 libc_cv_have_section_quotes=unknown
1503 rm -f conftest.{c,s}
1505 if test $libc_cv_have_section_quotes = yes; then
1506 AC_DEFINE(HAVE_SECTION_QUOTES)
1509 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1510 cat > conftest.c <<\EOF
1515 dnl No \ in command here because it ends up inside ''.
1516 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1517 -nostdlib -nostartfiles -Wl,--no-whole-archive
1518 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1519 libc_cv_ld_no_whole_archive=yes
1521 libc_cv_ld_no_whole_archive=no
1524 if test $libc_cv_ld_no_whole_archive = no; then
1525 AC_MSG_ERROR([support for --no-whole-archive is needed])
1528 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1529 cat > conftest.c <<\EOF
1532 __builtin_memset (x, 0, 1000);
1536 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1538 libc_cv_gcc_builtin_memset=no
1540 libc_cv_gcc_builtin_memset=yes
1543 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1544 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1547 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1548 cat > conftest.c <<\EOF
1549 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1550 char *foo (const char *a, const char *b)
1552 return __builtin_strstr (a, b);
1556 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1558 libc_cv_gcc_builtin_redirection=yes
1560 libc_cv_gcc_builtin_redirection=no
1563 if test "$libc_cv_gcc_builtin_redirection" = no; then
1564 AC_MSG_ERROR([support for the symbol redirection needed])
1567 dnl Check whether the compiler supports the __thread keyword.
1568 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1569 [cat > conftest.c <<\EOF
1570 __thread int a = 42;
1572 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1573 libc_cv_gcc___thread=yes
1575 libc_cv_gcc___thread=no
1578 if test "$libc_cv_gcc___thread" = no; then
1579 AC_MSG_ERROR([support for the __thread keyword is required])
1582 dnl Check whether the compiler supports the tls_model attribute.
1583 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1584 cat > conftest.c <<\EOF
1585 extern __thread int a __attribute__((tls_model ("initial-exec")));
1587 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1588 libc_cv_gcc_tls_model_attr=yes
1590 libc_cv_gcc_tls_model_attr=no
1593 if test "$libc_cv_gcc_tls_model_attr" = no; then
1594 AC_MSG_ERROR([support for the tls_model attribute is required])
1597 dnl Determine how to disable generation of FMA instructions.
1598 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1599 libc_cv_cc_nofma, [dnl
1601 for opt in -ffp-contract=off -mno-fused-madd; do
1602 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1604 AC_SUBST(libc_cv_cc_nofma)
1606 if test -n "$submachine"; then
1607 AC_CACHE_CHECK([for compiler option for CPU variant],
1608 libc_cv_cc_submachine, [dnl
1609 libc_cv_cc_submachine=no
1610 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1611 LIBC_TRY_CC_OPTION([$opt], [
1612 libc_cv_cc_submachine="$opt"
1615 if test "x$libc_cv_cc_submachine" = xno; then
1616 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1619 AC_SUBST(libc_cv_cc_submachine)
1621 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1622 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1623 cat > conftest.c <<EOF
1625 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1628 libc_cv_cc_loop_to_function=no
1629 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1631 libc_cv_cc_loop_to_function=yes
1634 if test $libc_cv_cc_loop_to_function = yes; then
1635 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1637 AC_SUBST(libc_cv_cc_loop_to_function)
1639 dnl Check whether we have the gd library available.
1640 AC_MSG_CHECKING(for libgd)
1641 if test "$with_gd" != "no"; then
1642 old_CFLAGS="$CFLAGS"
1643 CFLAGS="$CFLAGS $libgd_include"
1644 old_LDFLAGS="$LDFLAGS"
1645 LDFLAGS="$LDFLAGS $libgd_ldflags"
1647 LIBS="$LIBS -lgd -lpng -lz -lm"
1648 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1649 CFLAGS="$old_CFLAGS"
1650 LDFLAGS="$old_LDFLAGS"
1655 AC_MSG_RESULT($LIBGD)
1659 if test x$with_selinux = xno ; then
1662 # See if we have the SELinux library
1663 AC_CHECK_LIB(selinux, is_selinux_enabled,
1664 have_selinux=yes, have_selinux=no)
1665 if test x$with_selinux = xyes ; then
1666 if test x$have_selinux = xno ; then
1667 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1671 # Check if we're building with SELinux support.
1672 if test "x$have_selinux" = xyes; then
1673 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1675 # See if we have the libaudit library
1676 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1677 have_libaudit=yes, have_libaudit=no)
1678 if test "x$have_libaudit" = xyes; then
1679 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1681 AC_SUBST(have_libaudit)
1683 # See if we have the libcap library
1684 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1685 if test "x$have_libcap" = xyes; then
1686 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1688 AC_SUBST(have_libcap)
1690 AC_SUBST(have_selinux)
1693 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1694 dnl Since we are building the implementations of the fortified functions here,
1695 dnl having the macro defined interacts very badly.
1696 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1697 [AC_TRY_COMPILE([], [
1698 #ifdef _FORTIFY_SOURCE
1701 [libc_cv_predef_fortify_source=no],
1702 [libc_cv_predef_fortify_source=yes])])
1703 if test $libc_cv_predef_fortify_source = yes; then
1704 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1708 dnl Check for silly hacked compilers inserting -fstack-protector.
1709 dnl This breaks badly for the early startup code we compile, since
1710 dnl the compiled code can refer to a magic machine-dependent location
1711 dnl for the canary value before we have sufficient setup for that to
1712 dnl work. It's also questionable to build all of libc with this flag
1713 dnl even when you're doing that for most applications you build, since
1714 dnl libc's code is so heavily-used and performance-sensitive. If we
1715 dnl ever really want to make that work, it should be enabled explicitly
1716 dnl in the libc build, not inherited from implicit compiler settings.
1717 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1718 libc_cv_predef_stack_protector, [
1719 AC_TRY_COMPILE([extern void foobar (char *);],
1720 [char large_array[2048]; foobar (large_array);], [
1721 libc_undefs=`$NM -u conftest.o |
1722 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1723 2>&AS_MESSAGE_LOG_FD` || {
1724 AC_MSG_ERROR([confusing output from $NM -u])
1726 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1727 # On some architectures, there are architecture-specific undefined
1728 # symbols (resolved by the linker), so filter out unknown symbols.
1729 # This will fail to produce the correct result if the compiler
1730 # defaults to -fstack-protector but this produces an undefined symbol
1731 # other than __stack_chk_fail. However, compilers like that have not
1732 # been encountered in practice.
1733 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1734 case "$libc_undefs" in
1735 foobar) libc_cv_predef_stack_protector=no ;;
1737 foobar') libc_cv_predef_stack_protector=yes ;;
1738 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1740 [AC_MSG_ERROR([test compilation failed])])
1743 if test $libc_cv_predef_stack_protector = yes; then
1744 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1746 libc_extra_cppflags=
1748 # Some linkers on some architectures support __ehdr_start but with
1749 # bugs. Make sure usage of it does not create relocations in the
1750 # output (as the linker should resolve them all for us).
1751 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1752 libc_cv_ehdr_start, [
1753 old_CFLAGS="$CFLAGS"
1754 old_LDFLAGS="$LDFLAGS"
1756 CFLAGS="$CFLAGS -fPIC"
1757 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1759 AC_LINK_IFELSE([AC_LANG_SOURCE([
1764 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1765 long ehdr (void) { return __ehdr_start.val; }
1767 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1768 libc_cv_ehdr_start=broken
1770 libc_cv_ehdr_start=yes
1771 fi], [libc_cv_ehdr_start=no])
1772 CFLAGS="$old_CFLAGS"
1773 LDFLAGS="$old_LDFLAGS"
1776 if test "$libc_cv_ehdr_start" = yes; then
1777 AC_DEFINE([HAVE_EHDR_START])
1778 elif test "$libc_cv_ehdr_start" = broken; then
1779 AC_MSG_WARN([linker is broken -- you should upgrade])
1782 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1783 libc_cv_builtin_trap, [dnl
1784 libc_cv_builtin_trap=no
1785 AC_TRY_COMPILE([], [__builtin_trap ()], [
1786 libc_undefs=`$NM -u conftest.o |
1787 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1788 2>&AS_MESSAGE_LOG_FD` || {
1789 AC_MSG_ERROR([confusing output from $NM -u])
1791 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1792 if test -z "$libc_undefs"; then
1793 libc_cv_builtin_trap=yes
1795 if test $libc_cv_builtin_trap = yes; then
1796 AC_DEFINE([HAVE_BUILTIN_TRAP])
1799 dnl C++ feature tests.
1802 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1803 libc_cv_cxx_thread_local, [
1804 old_CXXFLAGS="$CXXFLAGS"
1805 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1806 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1809 // Compiler support.
1816 S * get () { return &s; }
1818 // libstdc++ support.
1819 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1820 #error __cxa_thread_atexit_impl not supported
1823 [libc_cv_cxx_thread_local=yes],
1824 [libc_cv_cxx_thread_local=no])
1825 CXXFLAGS="$old_CXXFLAGS"
1827 AC_SUBST(libc_cv_cxx_thread_local)
1830 dnl End of C++ feature tests.
1832 ### End of automated tests.
1833 ### Now run sysdeps configure fragments.
1835 # They also can set these variables.
1837 ldd_rewrite_script=no
1838 libc_cv_sysconfdir=$sysconfdir
1839 libc_cv_localstatedir=$localstatedir
1840 libc_cv_gcc_unwind_find_fde=no
1843 # Iterate over all the sysdep directories we will use, running their
1844 # configure fragments.
1845 for dir in $sysnames; do
1848 *) dest=$srcdir/$dir ;;
1850 if test -r $dest/configure; then
1851 AC_MSG_RESULT(running configure fragment for $dir)
1856 if test x"$build_mathvec" = xnotset; then
1859 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1861 AC_SUBST(libc_extra_cflags)
1862 AC_SUBST(libc_extra_cppflags)
1864 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1865 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1867 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1869 # A sysdeps configure fragment can reset this if IFUNC is not actually
1870 # usable even though the assembler knows how to generate the symbol type.
1871 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1872 AC_DEFINE(HAVE_IFUNC)
1875 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1876 # configure fragment can override the value to prevent this AC_DEFINE.
1878 if test "x$use_nscd" != xno; then
1879 AC_DEFINE([USE_NSCD])
1881 if test "x$build_nscd" = xdefault; then
1882 build_nscd=$use_nscd
1885 AC_SUBST(libc_cv_slibdir)
1886 AC_SUBST(libc_cv_rtlddir)
1887 AC_SUBST(libc_cv_localedir)
1888 AC_SUBST(libc_cv_sysconfdir)
1889 AC_SUBST(libc_cv_localstatedir)
1890 AC_SUBST(libc_cv_rootsbindir)
1891 AC_SUBST(libc_cv_forced_unwind)
1893 if test x$use_ldconfig = xyes; then
1894 AC_DEFINE(USE_LDCONFIG)
1896 AC_SUBST(use_ldconfig)
1897 AC_SUBST(ldd_rewrite_script)
1902 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1903 [libc_cv_pic_default=yes
1904 cat > conftest.c <<EOF
1905 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1906 # error PIC is default.
1909 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1910 libc_cv_pic_default=no
1913 AC_SUBST(libc_cv_pic_default)
1915 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1916 [libc_cv_pie_default=yes
1917 cat > conftest.c <<EOF
1918 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1919 # error PIE is default.
1922 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1923 libc_cv_pie_default=no
1926 AC_SUBST(libc_cv_pie_default)
1929 AC_SUBST(static_nss)
1933 dnl See sysdeps/mach/configure.ac for this variable.
1934 AC_SUBST(mach_interface_list)
1936 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1937 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1941 AC_CONFIG_FILES([config.make Makefile])
1942 AC_CONFIG_COMMANDS([default],[[
1943 case $CONFIG_FILES in *config.make*)
1944 echo "$config_vars" >> config.make;;
1946 test -d bits || mkdir bits]],[[config_vars='$config_vars']])