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 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
61 [libc_cv_cxx_link_ok=yes],
62 [libc_cv_cxx_link_ok=no])
64 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
66 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
67 AC_MSG_ERROR([you must configure in a separate build directory])
70 # This will get text that should go into config.make.
73 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
75 AC_HELP_STRING([--with-gd=DIR],
76 [find libgd include dir and library with prefix DIR]),
80 *) libgd_include="-I$withval/include"
81 libgd_ldflags="-L$withval/lib" ;;
84 AC_ARG_WITH([gd-include],
85 AC_HELP_STRING([--with-gd-include=DIR],
86 [find libgd include files in DIR]),
88 case "$with_gd_include" in
90 *) libgd_include="-I$withval" ;;
94 AC_HELP_STRING([--with-gd-lib=DIR],
95 [find libgd library files in DIR]),
97 case "$with_gd_lib" in
99 *) libgd_ldflags="-L$withval" ;;
103 if test -n "$libgd_include"; then
104 config_vars="$config_vars
105 CFLAGS-memusagestat.c = $libgd_include"
107 if test -n "$libgd_ldflags"; then
108 config_vars="$config_vars
109 libgd-LDFLAGS = $libgd_ldflags"
112 dnl Arguments to specify presence of other packages/features.
114 AC_HELP_STRING([--with-fp],
115 [if using floating-point hardware @<:@default=yes@:>@]),
119 AC_ARG_WITH([binutils],
120 AC_HELP_STRING([--with-binutils=PATH],
121 [specify location of binutils (as and ld)]),
122 [path_binutils=$withval],
124 AC_ARG_WITH([selinux],
125 AC_HELP_STRING([--with-selinux],
126 [if building with SELinux support]),
127 [with_selinux=$withval],
130 AC_ARG_WITH([headers],
131 AC_HELP_STRING([--with-headers=PATH],
132 [location of system headers to use
133 (for example /usr/src/linux/include)
134 @<:@default=compiler default@:>@]),
135 [sysheaders=$withval],
139 AC_SUBST(use_default_link)
140 AC_ARG_WITH([default-link],
141 AC_HELP_STRING([--with-default-link],
142 [do not use explicit linker scripts]),
143 [use_default_link=$withval],
144 [use_default_link=default])
146 AC_ARG_ENABLE([sanity-checks],
147 AC_HELP_STRING([--disable-sanity-checks],
148 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
149 [enable_sanity=$enableval],
152 AC_ARG_ENABLE([shared],
153 AC_HELP_STRING([--enable-shared],
154 [build shared library @<:@default=yes if GNU ld@:>@]),
157 AC_ARG_ENABLE([profile],
158 AC_HELP_STRING([--enable-profile],
159 [build profiled library @<:@default=no@:>@]),
160 [profile=$enableval],
162 AC_ARG_ENABLE([timezone-tools],
163 AC_HELP_STRING([--disable-timezone-tools],
164 [do not install timezone tools @<:@default=install@:>@]),
165 [enable_timezone_tools=$enableval],
166 [enable_timezone_tools=yes])
167 AC_SUBST(enable_timezone_tools)
169 AC_ARG_ENABLE([hardcoded-path-in-tests],
170 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
171 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
172 [hardcoded_path_in_tests=$enableval],
173 [hardcoded_path_in_tests=no])
174 AC_SUBST(hardcoded_path_in_tests)
176 AC_ARG_ENABLE([stackguard-randomization],
177 AC_HELP_STRING([--enable-stackguard-randomization],
178 [initialize __stack_chk_guard canary with a random number at program start]),
179 [enable_stackguard_randomize=$enableval],
180 [enable_stackguard_randomize=no])
181 if test "$enable_stackguard_randomize" = yes; then
182 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
185 AC_ARG_ENABLE([lock-elision],
186 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
187 [Enable lock elision for pthread mutexes by default]),
188 [enable_lock_elision=$enableval],
189 [enable_lock_elision=no])
190 AC_SUBST(enable_lock_elision)
191 if test "$enable_lock_elision" = yes ; then
192 AC_DEFINE(ENABLE_LOCK_ELISION)
195 dnl Generic infrastructure for drop-in additions to libc.
196 AC_ARG_ENABLE([add-ons],
197 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
198 [configure and build add-ons in DIR1,DIR2,...
199 search for add-ons if no parameter given]),
200 , [enable_add_ons=yes])
202 AC_ARG_ENABLE([hidden-plt],
203 AC_HELP_STRING([--disable-hidden-plt],
204 [do not hide internal function calls to avoid PLT]),
207 if test "x$hidden" = xno; then
211 AC_ARG_ENABLE([bind-now],
212 AC_HELP_STRING([--enable-bind-now],
213 [disable lazy relocations in DSOs]),
214 [bindnow=$enableval],
218 dnl On some platforms we cannot use dynamic loading. We must provide
219 dnl static NSS modules.
220 AC_ARG_ENABLE([static-nss],
221 AC_HELP_STRING([--enable-static-nss],
222 [build static NSS modules @<:@default=no@:>@]),
223 [static_nss=$enableval],
225 dnl Enable static NSS also if we build no shared objects.
226 if test x"$static_nss" = xyes || test x"$shared" = xno; then
228 AC_DEFINE(DO_STATIC_NSS)
231 AC_ARG_ENABLE([force-install],
232 AC_HELP_STRING([--disable-force-install],
233 [don't force installation of files from this package, even if they are older than the installed files]),
234 [force_install=$enableval],
236 AC_SUBST(force_install)
238 AC_ARG_ENABLE([maintainer-mode],
239 AC_HELP_STRING([--enable-maintainer-mode],
240 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
241 [maintainer=$enableval],
244 dnl On some platforms we allow dropping compatibility with all kernel
246 AC_ARG_ENABLE([kernel],
247 AC_HELP_STRING([--enable-kernel=VERSION],
248 [compile for compatibility with kernel not older than VERSION]),
249 [minimum_kernel=$enableval],
251 dnl Prevent unreasonable values.
252 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
253 # Better nothing than this.
256 if test "$minimum_kernel" = current; then
257 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
261 dnl For the development we sometimes want gcc to issue even more warnings.
262 dnl This is not the default since many of the extra warnings are not
264 AC_ARG_ENABLE([all-warnings],
265 AC_HELP_STRING([--enable-all-warnings],
266 [enable all useful warnings gcc can issue]),
267 [all_warnings=$enableval],
269 AC_SUBST(all_warnings)
271 AC_ARG_ENABLE([werror],
272 AC_HELP_STRING([--disable-werror],
273 [do not build with -Werror]),
274 [enable_werror=$enableval],
276 AC_SUBST(enable_werror)
278 AC_ARG_ENABLE([multi-arch],
279 AC_HELP_STRING([--enable-multi-arch],
280 [enable single DSO with optimizations for multiple architectures]),
281 [multi_arch=$enableval],
282 [multi_arch=default])
284 AC_ARG_ENABLE([nss-crypt],
285 AC_HELP_STRING([--enable-nss-crypt],
286 [enable libcrypt to use nss]),
287 [nss_crypt=$enableval],
289 if test x$nss_crypt = xyes; then
290 nss_includes=-I$(nss-config --includedir 2>/dev/null)
291 if test $? -ne 0; then
292 AC_MSG_ERROR([cannot find include directory with nss-config])
295 CFLAGS="$CFLAGS $nss_includes"
296 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
298 #include <nsslowhash.h>
299 void f (void) { NSSLOW_Init (); }])],
300 libc_cv_nss_crypt=yes,
302 cannot find NSS headers with lowlevel hash function interfaces]))
304 LIBS="$LIBS -lfreebl3"
305 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
307 #include <nsslowhash.h>],
309 libc_cv_nss_crypt=yes,
311 cannot link program using lowlevel NSS hash functions]))
317 AC_SUBST(libc_cv_nss_crypt)
320 AC_ARG_ENABLE([obsolete-rpc],
321 AC_HELP_STRING([--enable-obsolete-rpc],
322 [build and install the obsolete RPC code for link-time usage]),
323 [link_obsolete_rpc=$enableval],
324 [link_obsolete_rpc=no])
325 AC_SUBST(link_obsolete_rpc)
327 if test "$link_obsolete_rpc" = yes; then
328 AC_DEFINE(LINK_OBSOLETE_RPC)
331 AC_ARG_ENABLE([systemtap],
332 [AS_HELP_STRING([--enable-systemtap],
333 [enable systemtap static probe points @<:@default=no@:>@])],
334 [systemtap=$enableval],
336 if test "x$systemtap" != xno; then
337 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
339 CFLAGS="-std=gnu99 $CFLAGS"
340 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
341 void foo (int i, void *p)
343 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
344 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
345 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
346 CFLAGS="$old_CFLAGS"])
347 if test $libc_cv_sdt = yes; then
348 AC_DEFINE([USE_STAP_PROBE])
349 elif test "x$systemtap" != xauto; then
350 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
354 AC_ARG_ENABLE([build-nscd],
355 [AS_HELP_STRING([--disable-build-nscd],
356 [disable building and installing the nscd daemon])],
357 [build_nscd=$enableval],
358 [build_nscd=default])
361 # Note the use of $use_nscd is near the bottom of the file.
362 AC_ARG_ENABLE([nscd],
363 [AS_HELP_STRING([--disable-nscd],
364 [library functions will not contact the nscd daemon])],
365 [use_nscd=$enableval],
368 AC_ARG_ENABLE([pt_chown],
369 [AS_HELP_STRING([--enable-pt_chown],
370 [Enable building and installing pt_chown])],
371 [build_pt_chown=$enableval],
373 AC_SUBST(build_pt_chown)
374 if test "$build_pt_chown" = yes; then
375 AC_DEFINE(HAVE_PT_CHOWN)
378 # The abi-tags file uses a fairly simplistic model for name recognition that
379 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
380 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
381 # This doesn't get used much beyond that, so it's fairly safe.
386 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
390 AC_ARG_ENABLE([mathvec],
391 [AS_HELP_STRING([--enable-mathvec],
392 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
393 [build_mathvec=$enableval],
394 [build_mathvec=notset])
396 # We keep the original values in `$config_*' and never modify them, so we
397 # can write them unchanged into config.make. Everything else uses
398 # $machine, $vendor, and $os, and changes them whenever convenient.
399 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
401 # Don't allow vendor == "unknown"
402 test "$config_vendor" = unknown && config_vendor=
403 config_os="`echo $config_os | sed 's/^unknown-//'`"
405 # Some configurations imply other options.
408 # The configure fragment of an add-on port can modify these to supplement
409 # or override the table in the case statement below. No fragment should
410 # ever change the config_* variables, however.
411 machine=$config_machine
412 vendor=$config_vendor
418 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
421 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
423 *) submachine="$withval" ;;
427 # An preconfigure script can set this when it wants to disable the sanity
431 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
432 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
434 dnl Having this here, though empty, makes sure that if add-ons' fragments
435 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
436 dnl our AC_OUTPUT will actually use it.
439 case "$enable_add_ons" in
442 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
443 sed 's@/[[^/]]*$@@' | sort | uniq`
444 add_ons_automatic=yes
446 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
447 add_ons_automatic=no ;;
453 if test x"$add_ons" != x; then
454 for f in $add_ons; do
459 *** It seems that you're using an old \`crypt' add-on. crypt is now
460 *** part of glibc and using the old add-on will not work with this
461 *** release. Start again with fresh sources and without the old
462 *** \`crypt' add-on.])
466 *** It seems that you're using an old \`localedata' add-on. localedata
467 *** is now part of glibc and using the old add-on will not work with
468 *** this release. Start again with fresh sources and without the old
469 *** \`localedata' add-on.])
474 # Now source each add-on's configure fragment.
475 # The fragments can use $srcdir/$libc_add_on to find themselves,
476 # and test $add_ons_automatic to see if they were explicitly requested.
477 # A fragment can clear (or even change) $libc_add_on to affect
478 # whether it goes into the list to be actually used in the build.
480 for libc_add_on in $add_ons; do
481 # Test whether such a directory really exists.
482 # It can be absolute, or relative to $srcdir, or relative to the build dir.
483 case "$libc_add_on" in
485 libc_add_on_srcdir=$libc_add_on
488 test -d "$srcdir/$libc_add_on" || {
489 if test -d "$libc_add_on"; then
490 libc_add_on="`pwd`/$libc_add_on"
492 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
495 libc_add_on_srcdir=$srcdir/$libc_add_on
499 libc_add_on_frag=$libc_add_on_srcdir/configure
500 libc_add_on_canonical=
501 libc_add_on_config_subdirs=
502 if test -r "$libc_add_on_frag"; then
503 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
504 libc_add_on_canonical=unknown
506 . "$libc_add_on_frag"
507 test -z "$libc_add_on" || {
508 configured_add_ons="$configured_add_ons $libc_add_on"
509 if test "x$libc_add_on_canonical" = xunknown; then
510 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
512 for d in $libc_add_on_subdirs; do
513 case "$libc_add_on" in
514 /*) subdir_srcdir="$libc_add_on" ;;
515 *) subdir_srcdir="\$(..)$libc_add_on" ;;
519 d="${libc_add_on_canonical:-$libc_add_on}"
525 subdir_srcdir="$subdir_srcdir/$d"
528 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
529 add_on_subdirs="$add_on_subdirs $d"
530 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
531 $d-srcdir = $subdir_srcdir"
533 for d in $libc_add_on_config_subdirs; do
536 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
538 if test ! -d "$libc_add_on_srcdir/$d"; then
539 AC_MSG_ERROR(fragment wants to configure missing directory $d)
541 case "$libc_add_on" in
543 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
545 subdirs="$subdirs $libc_add_on/$d"
549 if test -n "$libc_add_on"; then
550 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
551 use_add_ons="$use_add_ons $libc_add_on"
552 add_ons_pfx="$add_ons_pfx $libc_add_on/"
553 test -z "$libc_add_on_canonical" ||
554 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
557 # Use echo to strip excess whitespace.
558 add_ons="`echo $use_add_ons`"
561 AC_SUBST(add_on_subdirs)
565 ### I put this here to prevent those annoying emails from people who cannot
566 ### read and try to compile glibc on unsupported platforms. --drepper
568 ### By using the undocumented --enable-hacker-mode option for configure
569 ### one can skip this test to make the configuration not fail for unsupported
572 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
573 case "$machine-$host_os" in
577 echo "*** The GNU C library is currently not available for this platform."
578 echo "*** So far nobody cared to port it and if there is no volunteer it"
579 echo "*** might never happen. So, if you have interest to see glibc on"
580 echo "*** this platform visit"
581 echo "*** http://www.gnu.org/software/libc/porting.html"
582 echo "*** and join the group of porters"
588 # Set base_machine if not set by a preconfigure fragment.
589 test -n "$base_machine" || base_machine=$machine
590 AC_SUBST(base_machine)
592 # For the multi-arch option we need support in the assembler & linker.
593 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
594 libc_cv_ld_gnu_indirect_function, [dnl
595 cat > conftest.S <<EOF
596 .type foo,%gnu_indirect_function
609 libc_cv_ld_gnu_indirect_function=no
610 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
611 -nostartfiles -nostdlib \
612 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
613 # Do a link to see if the backend supports IFUNC relocs.
614 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
615 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
616 libc_cv_ld_gnu_indirect_function=yes
621 AC_MSG_CHECKING(whether .text pseudo-op must be used)
622 AC_CACHE_VAL(libc_cv_dot_text, [dnl
623 cat > conftest.s <<EOF
627 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
628 libc_cv_dot_text=.text
631 if test -z "$libc_cv_dot_text"; then
637 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
638 if test x"$multi_arch" = xyes; then
639 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
645 if test x"$multi_arch" != xno; then
646 multi_arch_d=/multiarch
649 # Compute the list of sysdep directories for this configuration.
650 # This can take a while to compute.
651 sysdep_dir=$srcdir/sysdeps
652 AC_MSG_CHECKING(sysdep dirs)
653 dnl We need to use [ and ] for other purposes for a while now.
655 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
656 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
658 test "x$base_os" != x || case "$os" in
665 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
668 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
672 o=`echo $tail | sed 's/[0-9]*$//'`
673 if test $o != $tail; then
676 # For linux-gnu, try linux-gnu, then linux.
677 o=`echo $tail | sed 's/-.*$//'`
678 if test $o != $tail; then
682 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
685 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
691 # For sparc/sparc32, try sparc/sparc32 and then sparc.
693 tail=$machine${submachine:+/$submachine}
694 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
696 # Prepend the machine's FPU directory unless --without-fp.
697 if test "$with_fp" = yes; then
702 # For each machine term, try it with and then without /multiarch.
703 for try_fpu in $maybe_fpu ''; do
704 for try_multi in $multi_arch_d ''; do
705 mach="$mach /$1$try_fpu$try_multi"
711 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
714 # Find what sysdep directories exist.
717 for b in $base ''; do
718 for m0 in $mach ''; do
719 for v in /$vendor ''; do
720 test "$v" = / && continue
721 for o in /$ostry ''; do
722 test "$o" = / && continue
723 for m in $mach ''; do
724 for d in $add_ons_pfx ''; do
725 for a in $add_ons_sfx ''; do
726 try_suffix="$m0$b$v$o$m"
727 if test -n "$try_suffix"; then
728 try_srcdir="${srcdir}/"
732 try="${d}sysdeps$try_suffix$a"
733 test -n "$enable_debug_configure" &&
734 echo "$0 [DEBUG]: try $try" >&2
735 if test -d "$try_srcdir$try"; then
736 sysnames="$sysnames $try"
737 { test -n "$o" || test -n "$b"; } && os_used=t
738 { test -n "$m" || test -n "$m0"; } && machine_used=t
740 x*/$submachine) submachine_used=t ;;
742 if test -n "$d"; then
743 case "$sysnames_add_ons" in
745 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
758 # If the assembler supports gnu_indirect_function symbol type and the
759 # architecture supports multi-arch, we enable multi-arch by default.
760 case $sysnames_add_ons$sysnames in
764 test x"$multi_arch" = xdefault && multi_arch=no
767 if test x"$multi_arch" != xno; then
768 AC_DEFINE(USE_MULTIARCH)
772 if test -z "$os_used" && test "$os" != none; then
773 AC_MSG_ERROR(Operating system $os is not supported.)
775 if test -z "$machine_used" && test "$machine" != none; then
776 AC_MSG_ERROR(The $machine is not supported.)
778 if test -z "$submachine_used" && test -n "$submachine"; then
779 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
783 # We have now validated the configuration.
785 # Expand the list of system names into a full list of directories
786 # from each element's parent name and Implies file (if present).
789 while test $# -gt 0; do
793 case " $names " in *" $name "*)
794 # Already in the list.
798 # Report each name as we discover it, so there is no long pause in output.
799 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
801 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
805 *) xsrcdir=$srcdir/ ;;
807 test -n "$enable_debug_configure" &&
808 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
810 for implies_file in Implies Implies-before Implies-after; do
811 implies_type=`echo $implies_file | sed s/-/_/`
812 eval ${implies_type}=
813 if test -f $xsrcdir$name/$implies_file; then
814 # Collect more names from the `Implies' file (removing comments).
815 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
816 for x in $implied_candidate; do
818 if test -d $xsrcdir$name_base/$x; then
819 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
822 for d in $add_ons_pfx ''; do
826 *) try_srcdir=$srcdir/ ;;
828 test -n "$enable_debug_configure" &&
829 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
830 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
832 eval "${implies_type}=\"\$${implies_type} \$try\""
834 case "$sysnames_add_ons" in
836 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
840 if test $found = no; then
841 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
847 # Add NAME to the list of names.
850 # Find the parent of NAME, using the empty string if it has none.
852 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
855 test -n "$enable_debug_configure" &&
856 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
857 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
859 # Add the names implied by NAME, and NAME's parent (if it has one), to
860 # the list of names to be processed (the argument list). We prepend the
861 # implied names to the list and append the parent. We want implied
862 # directories to come before further directories inferred from the
863 # configuration components; this ensures that for sysv4, unix/common
864 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
866 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
867 test -n "$sysnames" && set $sysnames
870 # Add the default directories.
871 default_sysnames="sysdeps/generic"
872 sysnames="$names $default_sysnames"
874 # The other names were emitted during the scan.
875 AC_MSG_RESULT($default_sysnames)
877 # Collect the list of add-ons that supply partial sysdeps trees.
879 for add_on in $add_ons; do
882 *) xsrcdir="$srcdir/" ;;
885 test -d "$xsrcdir$add_on/sysdeps" || {
886 case "$configured_add_ons " in
889 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
895 sysdeps_add_ons="$sysdeps_add_ons $add_on"
896 case "$sysnames_add_ons" in
899 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
904 for d in $sysnames; do
906 $add_on/sysdeps/*) ;;
909 (cd "$xsrcdir$d" && for f in *[[!~]]; do
913 test -d "$ff" || { test -e "$ff" && exit 88; }
917 test -d "$f" || { test -e "$f" && exit 88; }
921 if test $? -eq 88; then
926 if test $found = no; then
927 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
930 AC_SUBST(sysdeps_add_ons)
936 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
937 # The makefiles need to use a different form to find it in $srcdir.
938 INSTALL='\$(..)./scripts/install-sh -c'
944 # Accept binutils 2.22 or newer.
945 AC_CHECK_PROG_VER(AS, $AS, --version,
946 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
947 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
948 AS=: critic_missing="$critic_missing as")
949 AC_CHECK_PROG_VER(LD, $LD, --version,
950 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
951 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
952 LD=: critic_missing="$critic_missing ld")
954 # These programs are version sensitive.
956 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
957 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
958 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
960 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
961 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
962 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
963 MSGFMT=: aux_missing="$aux_missing msgfmt")
964 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
965 [GNU texinfo.* \([0-9][0-9.]*\)],
966 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
967 MAKEINFO=: aux_missing="$aux_missing makeinfo")
968 AC_CHECK_PROG_VER(SED, sed, --version,
969 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
970 [3.0[2-9]*|3.[1-9]*|[4-9]*],
971 SED=: aux_missing="$aux_missing sed")
972 AC_CHECK_PROG_VER(AWK, gawk, --version,
973 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
974 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
976 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
978 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
979 #error insufficient compiler
981 [libc_cv_compiler_ok=yes],
982 [libc_cv_compiler_ok=no])])
983 AS_IF([test $libc_cv_compiler_ok != yes],
984 [critic_missing="$critic_missing compiler"])
986 AC_CHECK_TOOL(NM, nm, false)
988 if test "x$maintainer" = "xyes"; then
989 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
991 xno|x|x:) AUTOCONF=no ;;
994 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
995 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
996 libc_cv_autoconf_works=yes
998 libc_cv_autoconf_works=no
1000 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1003 if test "x$AUTOCONF" = xno; then
1004 aux_missing="$aux_missing autoconf"
1010 test -n "$critic_missing" && AC_MSG_ERROR([
1011 *** These critical programs are missing or too old:$critic_missing
1012 *** Check the INSTALL file for required versions.])
1014 test -n "$aux_missing" && AC_MSG_WARN([
1015 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1016 *** some features will be disabled.
1017 *** Check the INSTALL file for required versions.])
1019 # if using special system headers, find out the compiler's sekrit
1020 # header directory and add that to the list. NOTE: Only does the right
1021 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1022 if test -n "$sysheaders"; then
1023 SYSINCLUDES=-nostdinc
1024 for d in include include-fixed; do
1025 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1026 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1028 SYSINCLUDES="$SYSINCLUDES \
1029 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1030 if test -n "$CXX"; then
1032 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1033 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1034 test "x$cxxheaders" != x &&
1035 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1039 AC_SUBST(SYSINCLUDES)
1040 AC_SUBST(CXX_SYSINCLUDES)
1042 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1043 # since this would lead to problems installing/building glibc.
1044 # LD_LIBRARY_PATH contains the current directory if one of the following
1046 # - one of the terminals (":" and ";") is the first or last sign
1047 # - two terminals occur directly after each other
1048 # - the path contains an element with a dot in it
1049 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1051 case ${LD_LIBRARY_PATH} in
1052 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1053 ld_library_path_setting="contains current directory"
1056 ld_library_path_setting="ok"
1060 AC_MSG_RESULT($ld_library_path_setting)
1061 if test "$ld_library_path_setting" != "ok"; then
1063 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1064 *** building glibc. Please change the environment variable
1065 *** and run configure again.])
1068 AC_PATH_PROG(BASH_SHELL, bash, no)
1070 AC_PATH_PROG(PERL, perl, no)
1071 if test "$PERL" != no &&
1072 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1075 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1076 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1077 AC_CHECK_PROG_VER(BISON, bison, --version,
1078 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1079 [2.7*|[3-9].*|[1-9][0-9]*],
1082 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1083 libc_cv_need_minus_P, [dnl
1084 cat > conftest.S <<EOF
1085 #include "confdefs.h"
1086 /* Nothing whatsoever. */
1088 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1089 libc_cv_need_minus_P=no
1091 libc_cv_need_minus_P=yes
1094 if test $libc_cv_need_minus_P = yes; then
1095 config_vars="$config_vars
1096 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1099 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1100 cat > conftest.s <<EOF
1103 .set glibc_conftest_frobozz,foo
1104 .globl glibc_conftest_frobozz
1106 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1107 # (but it doesn't work), so we must do a linking check to be sure.
1108 cat > conftest1.c <<\EOF
1109 extern int glibc_conftest_frobozz;
1110 void _start() { glibc_conftest_frobozz = 1; }
1112 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1113 -nostartfiles -nostdlib \
1114 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1115 libc_cv_asm_set_directive=yes
1117 libc_cv_asm_set_directive=no
1120 if test $libc_cv_asm_set_directive = yes; then
1121 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1124 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1125 libc_cv_asm_unique_object, [dnl
1126 cat > conftest.s <<EOF
1129 .type _sym, %gnu_unique_object
1131 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1132 libc_cv_asm_unique_object=yes
1134 libc_cv_asm_unique_object=no
1137 if test $libc_cv_asm_unique_object = yes; then
1138 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1141 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1142 libc_cv_asm_protected_directive, [dnl
1143 cat > conftest.s <<EOF
1149 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1150 libc_cv_asm_protected_directive=yes
1152 AC_MSG_ERROR(assembler support for symbol visibility is required)
1156 if test $libc_cv_asm_protected_directive = yes; then
1157 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1158 libc_cv_visibility_attribute,
1159 [cat > conftest.c <<EOF
1160 int foo __attribute__ ((visibility ("hidden"))) = 1;
1161 int bar __attribute__ ((visibility ("protected"))) = 1;
1163 libc_cv_visibility_attribute=no
1164 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1165 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1166 if grep '\.protected.*bar' conftest.s >/dev/null; then
1167 libc_cv_visibility_attribute=yes
1171 rm -f conftest.{c,s}
1173 if test $libc_cv_visibility_attribute != yes; then
1174 AC_MSG_ERROR(compiler support for visibility attribute is required)
1178 if test $libc_cv_visibility_attribute = yes; then
1179 AC_CACHE_CHECK(linker support for protected data symbol,
1180 libc_cv_protected_data,
1181 [cat > conftest.c <<EOF
1182 int bar __attribute__ ((visibility ("protected"))) = 1;
1184 libc_cv_protected_data=no
1185 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
1186 cat > conftest.c <<EOF
1188 int main (void) { return bar; }
1190 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
1191 libc_cv_protected_data=yes
1197 libc_cv_protected_data=no
1199 AC_SUBST(libc_cv_protected_data)
1201 if test $libc_cv_visibility_attribute = yes; then
1202 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1203 libc_cv_broken_visibility_attribute,
1204 [cat > conftest.c <<EOF
1206 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1207 int bar (int x) { return x; }
1209 libc_cv_broken_visibility_attribute=yes
1210 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1212 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1214 libc_cv_broken_visibility_attribute=no
1217 rm -f conftest.c conftest.s
1219 if test $libc_cv_broken_visibility_attribute = yes; then
1220 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1224 AC_CACHE_CHECK(for broken __attribute__((alias())),
1225 libc_cv_broken_alias_attribute,
1226 [cat > conftest.c <<EOF
1227 extern int foo (int x) __asm ("xyzzy");
1228 int bar (int x) { return x; }
1229 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1231 extern __typeof (dfoo) dfoo __asm ("abccb");
1234 libc_cv_broken_alias_attribute=yes
1235 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1236 if grep 'xyzzy' conftest.s >/dev/null &&
1237 grep 'abccb' conftest.s >/dev/null; then
1238 libc_cv_broken_alias_attribute=no
1241 rm -f conftest.c conftest.s
1243 if test $libc_cv_broken_alias_attribute = yes; then
1244 AC_MSG_ERROR(working alias attribute support required)
1247 if test $libc_cv_visibility_attribute = yes; then
1248 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1249 libc_cv_have_sdata_section,
1250 [echo "int i;" > conftest.c
1251 libc_cv_have_sdata_section=no
1252 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1253 | grep '\.sdata' >/dev/null; then
1254 libc_cv_have_sdata_section=yes
1256 rm -f conftest.c conftest.so
1258 if test $libc_cv_have_sdata_section = yes; then
1259 AC_DEFINE(HAVE_SDATA_SECTION)
1263 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1264 libc_cv_initfini_array, [dnl
1265 LIBC_TRY_LINK_STATIC([
1266 int foo (void) { return 1; }
1267 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1269 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1270 libc_cv_initfini_array=yes
1272 libc_cv_initfini_array=no
1274 [libc_cv_initfini_array=no])
1276 if test $libc_cv_initfini_array != yes; then
1277 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1280 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1281 libc_cv_ctors_header, [dnl
1282 libc_cv_ctors_header=yes
1283 LIBC_TRY_LINK_STATIC([
1284 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1285 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1288 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1289 { gsub(/\@<:@ */, "@<:@") }
1290 $2 == ".ctors" || $2 == ".dtors" {
1291 size = strtonum("0x" $6)
1292 align = strtonum("0x" $NF)
1294 stub@<:@$2@:>@ = size == align * 2
1297 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1298 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1299 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1301 '], [libc_cv_ctors_header=no])
1303 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1306 if test $libc_cv_ctors_header = no; then
1307 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1310 AC_CACHE_CHECK(for libunwind-support in compiler,
1311 libc_cv_cc_with_libunwind, [
1312 cat > conftest.c <<EOF
1313 int main (void) { return 0; }
1315 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1316 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1317 libc_cv_cc_with_libunwind=yes
1319 libc_cv_cc_with_libunwind=no
1322 AC_SUBST(libc_cv_cc_with_libunwind)
1323 if test $libc_cv_cc_with_libunwind = yes; then
1324 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1327 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1328 [libc_cv_z_nodelete=yes],
1329 [AC_MSG_ERROR(linker with -z nodelete support required)])
1331 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1332 [libc_cv_z_nodlopen=yes],
1333 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1335 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1336 [libc_cv_z_initfirst=yes],
1337 [AC_MSG_ERROR(linker with -z initfirst support required)])
1340 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1341 libc_cv_as_noexecstack, [dnl
1342 cat > conftest.c <<EOF
1345 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1346 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1347 && grep .note.GNU-stack conftest.s >/dev/null \
1348 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1349 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1351 libc_cv_as_noexecstack=yes
1353 libc_cv_as_noexecstack=no
1356 if test $libc_cv_as_noexecstack = yes; then
1357 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1359 AC_SUBST(ASFLAGS_config)
1361 AC_CACHE_CHECK(for -z combreloc,
1362 libc_cv_z_combreloc, [dnl
1363 cat > conftest.c <<EOF
1364 extern int bar (int);
1366 int foo (void) { return bar (mumble); }
1368 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1369 -fPIC -shared -o conftest.so conftest.c
1370 -nostdlib -nostartfiles
1371 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1373 dnl The following test is a bit weak. We must use a tool which can test
1374 dnl cross-platform since the gcc used can be a cross compiler. Without
1375 dnl introducing new options this is not easily doable. Instead use a tool
1376 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1377 dnl look for a section named .rel.dyn.
1378 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1379 libc_cv_z_combreloc=yes
1381 libc_cv_z_combreloc=no
1384 libc_cv_z_combreloc=no
1387 if test "$libc_cv_z_combreloc" = yes; then
1388 AC_DEFINE(HAVE_Z_COMBRELOC)
1390 AC_SUBST(libc_cv_z_combreloc)
1392 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1393 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1394 AC_SUBST(libc_cv_z_execstack)
1396 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1397 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1400 AC_SUBST(libc_cv_fpie)
1402 AC_CACHE_CHECK(for --hash-style option,
1403 libc_cv_hashstyle, [dnl
1404 cat > conftest.c <<EOF
1405 int _start (void) { return 42; }
1407 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1408 -fPIC -shared -o conftest.so conftest.c
1409 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1411 libc_cv_hashstyle=yes
1413 libc_cv_hashstyle=no
1416 AC_SUBST(libc_cv_hashstyle)
1418 # The linker's default -shared behavior is good enough if it
1419 # does these things that our custom linker scripts ensure that
1420 # all allocated NOTE sections come first.
1421 if test "$use_default_link" = default; then
1422 AC_CACHE_CHECK([for sufficient default -shared layout],
1423 libc_cv_use_default_link, [dnl
1424 libc_cv_use_default_link=no
1425 cat > conftest.s <<\EOF
1426 .section .note.a,"a",%note
1431 .section .note.b,"a",%note
1437 if AC_TRY_COMMAND([dnl
1438 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1439 ac_try=`$READELF -S conftest.so | sed -n \
1441 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1447 libc_seen_a=no libc_seen_b=no
1449 while test $# -ge 2 -a "$1" = NOTE; do
1451 .note.a) libc_seen_a=yes ;;
1452 .note.b) libc_seen_b=yes ;;
1456 case "$libc_seen_a$libc_seen_b" in
1458 libc_cv_use_default_link=yes
1461 echo >&AS_MESSAGE_LOG_FD "\
1462 $libc_seen_a$libc_seen_b from:
1468 use_default_link=$libc_cv_use_default_link
1471 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1472 if libc_cv_output_format=`
1473 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1477 libc_cv_output_format=
1479 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1480 AC_SUBST(libc_cv_output_format)
1482 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1483 cat > conftest.c <<EOF
1486 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1487 conftest.c 1>&AS_MESSAGE_LOG_FD])
1489 libc_cv_fno_toplevel_reorder=yes
1491 libc_cv_fno_toplevel_reorder=no
1494 if test $libc_cv_fno_toplevel_reorder = yes; then
1495 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1497 fno_unit_at_a_time=-fno-unit-at-a-time
1499 AC_SUBST(fno_unit_at_a_time)
1501 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1502 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1506 AC_SUBST(libc_cv_ssp)
1508 AC_CACHE_CHECK(whether cc puts quotes around section names,
1509 libc_cv_have_section_quotes,
1510 [cat > conftest.c <<EOF
1511 static const int foo
1512 __attribute__ ((section ("bar"))) = 1;
1514 if ${CC-cc} -S conftest.c -o conftest.s; then
1515 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1516 libc_cv_have_section_quotes=yes
1518 libc_cv_have_section_quotes=no
1521 libc_cv_have_section_quotes=unknown
1523 rm -f conftest.{c,s}
1525 if test $libc_cv_have_section_quotes = yes; then
1526 AC_DEFINE(HAVE_SECTION_QUOTES)
1529 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1530 cat > conftest.c <<\EOF
1535 dnl No \ in command here because it ends up inside ''.
1536 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1537 -nostdlib -nostartfiles -Wl,--no-whole-archive
1538 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1539 libc_cv_ld_no_whole_archive=yes
1541 libc_cv_ld_no_whole_archive=no
1544 if test $libc_cv_ld_no_whole_archive = no; then
1545 AC_MSG_ERROR([support for --no-whole-archive is needed])
1548 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1549 cat > conftest.c <<\EOF
1552 __builtin_memset (x, 0, 1000);
1556 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1558 libc_cv_gcc_builtin_memset=no
1560 libc_cv_gcc_builtin_memset=yes
1563 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1564 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1567 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1568 cat > conftest.c <<\EOF
1569 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1570 char *foo (const char *a, const char *b)
1572 return __builtin_strstr (a, b);
1576 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1578 libc_cv_gcc_builtin_redirection=yes
1580 libc_cv_gcc_builtin_redirection=no
1583 if test "$libc_cv_gcc_builtin_redirection" = no; then
1584 AC_MSG_ERROR([support for the symbol redirection needed])
1587 dnl Check whether the compiler supports the __thread keyword.
1588 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1589 [cat > conftest.c <<\EOF
1590 __thread int a = 42;
1592 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1593 libc_cv_gcc___thread=yes
1595 libc_cv_gcc___thread=no
1598 if test "$libc_cv_gcc___thread" = no; then
1599 AC_MSG_ERROR([support for the __thread keyword is required])
1602 dnl Check whether the compiler supports the tls_model attribute.
1603 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1604 cat > conftest.c <<\EOF
1605 extern __thread int a __attribute__((tls_model ("initial-exec")));
1607 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1608 libc_cv_gcc_tls_model_attr=yes
1610 libc_cv_gcc_tls_model_attr=no
1613 if test "$libc_cv_gcc_tls_model_attr" = no; then
1614 AC_MSG_ERROR([support for the tls_model attribute is required])
1617 dnl Determine how to disable generation of FMA instructions.
1618 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1619 libc_cv_cc_nofma, [dnl
1621 for opt in -ffp-contract=off -mno-fused-madd; do
1622 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1624 AC_SUBST(libc_cv_cc_nofma)
1626 if test -n "$submachine"; then
1627 AC_CACHE_CHECK([for compiler option for CPU variant],
1628 libc_cv_cc_submachine, [dnl
1629 libc_cv_cc_submachine=no
1630 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1631 LIBC_TRY_CC_OPTION([$opt], [
1632 libc_cv_cc_submachine="$opt"
1635 if test "x$libc_cv_cc_submachine" = xno; then
1636 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1639 AC_SUBST(libc_cv_cc_submachine)
1641 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1642 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1643 cat > conftest.c <<EOF
1645 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1648 libc_cv_cc_loop_to_function=no
1649 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1651 libc_cv_cc_loop_to_function=yes
1654 if test $libc_cv_cc_loop_to_function = yes; then
1655 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1657 AC_SUBST(libc_cv_cc_loop_to_function)
1659 dnl Check whether we have the gd library available.
1660 AC_MSG_CHECKING(for libgd)
1661 if test "$with_gd" != "no"; then
1662 old_CFLAGS="$CFLAGS"
1663 CFLAGS="$CFLAGS $libgd_include"
1664 old_LDFLAGS="$LDFLAGS"
1665 LDFLAGS="$LDFLAGS $libgd_ldflags"
1667 LIBS="$LIBS -lgd -lpng -lz -lm"
1668 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1669 CFLAGS="$old_CFLAGS"
1670 LDFLAGS="$old_LDFLAGS"
1675 AC_MSG_RESULT($LIBGD)
1679 if test x$with_selinux = xno ; then
1682 # See if we have the SELinux library
1683 AC_CHECK_LIB(selinux, is_selinux_enabled,
1684 have_selinux=yes, have_selinux=no)
1685 if test x$with_selinux = xyes ; then
1686 if test x$have_selinux = xno ; then
1687 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1691 # Check if we're building with SELinux support.
1692 if test "x$have_selinux" = xyes; then
1693 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1695 # See if we have the libaudit library
1696 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1697 have_libaudit=yes, have_libaudit=no)
1698 if test "x$have_libaudit" = xyes; then
1699 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1701 AC_SUBST(have_libaudit)
1703 # See if we have the libcap library
1704 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1705 if test "x$have_libcap" = xyes; then
1706 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1708 AC_SUBST(have_libcap)
1710 AC_SUBST(have_selinux)
1713 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1714 dnl Since we are building the implementations of the fortified functions here,
1715 dnl having the macro defined interacts very badly.
1716 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1717 [AC_TRY_COMPILE([], [
1718 #ifdef _FORTIFY_SOURCE
1721 [libc_cv_predef_fortify_source=no],
1722 [libc_cv_predef_fortify_source=yes])])
1723 if test $libc_cv_predef_fortify_source = yes; then
1724 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1728 dnl Check for silly hacked compilers inserting -fstack-protector.
1729 dnl This breaks badly for the early startup code we compile, since
1730 dnl the compiled code can refer to a magic machine-dependent location
1731 dnl for the canary value before we have sufficient setup for that to
1732 dnl work. It's also questionable to build all of libc with this flag
1733 dnl even when you're doing that for most applications you build, since
1734 dnl libc's code is so heavily-used and performance-sensitive. If we
1735 dnl ever really want to make that work, it should be enabled explicitly
1736 dnl in the libc build, not inherited from implicit compiler settings.
1737 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1738 libc_cv_predef_stack_protector, [
1739 AC_TRY_COMPILE([extern void foobar (char *);],
1740 [char large_array[2048]; foobar (large_array);], [
1741 libc_undefs=`$NM -u conftest.o |
1742 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1743 2>&AS_MESSAGE_LOG_FD` || {
1744 AC_MSG_ERROR([confusing output from $NM -u])
1746 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1747 # On some architectures, there are architecture-specific undefined
1748 # symbols (resolved by the linker), so filter out unknown symbols.
1749 # This will fail to produce the correct result if the compiler
1750 # defaults to -fstack-protector but this produces an undefined symbol
1751 # other than __stack_chk_fail. However, compilers like that have not
1752 # been encountered in practice.
1753 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1754 case "$libc_undefs" in
1755 foobar) libc_cv_predef_stack_protector=no ;;
1757 foobar') libc_cv_predef_stack_protector=yes ;;
1758 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1760 [AC_MSG_ERROR([test compilation failed])])
1763 if test $libc_cv_predef_stack_protector = yes; then
1764 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1766 libc_extra_cppflags=
1768 # Some linkers on some architectures support __ehdr_start but with
1769 # bugs. Make sure usage of it does not create relocations in the
1770 # output (as the linker should resolve them all for us).
1771 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1772 libc_cv_ehdr_start, [
1773 old_CFLAGS="$CFLAGS"
1774 old_LDFLAGS="$LDFLAGS"
1776 CFLAGS="$CFLAGS -fPIC"
1777 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1779 AC_LINK_IFELSE([AC_LANG_SOURCE([
1784 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1785 long ehdr (void) { return __ehdr_start.val; }
1787 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1788 libc_cv_ehdr_start=broken
1790 libc_cv_ehdr_start=yes
1791 fi], [libc_cv_ehdr_start=no])
1792 CFLAGS="$old_CFLAGS"
1793 LDFLAGS="$old_LDFLAGS"
1796 if test "$libc_cv_ehdr_start" = yes; then
1797 AC_DEFINE([HAVE_EHDR_START])
1798 elif test "$libc_cv_ehdr_start" = broken; then
1799 AC_MSG_WARN([linker is broken -- you should upgrade])
1802 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1803 libc_cv_builtin_trap, [dnl
1804 libc_cv_builtin_trap=no
1805 AC_TRY_COMPILE([], [__builtin_trap ()], [
1806 libc_undefs=`$NM -u conftest.o |
1807 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1808 2>&AS_MESSAGE_LOG_FD` || {
1809 AC_MSG_ERROR([confusing output from $NM -u])
1811 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1812 if test -z "$libc_undefs"; then
1813 libc_cv_builtin_trap=yes
1815 if test $libc_cv_builtin_trap = yes; then
1816 AC_DEFINE([HAVE_BUILTIN_TRAP])
1819 dnl C++ feature tests.
1822 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1823 libc_cv_cxx_thread_local, [
1824 old_CXXFLAGS="$CXXFLAGS"
1825 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1826 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1829 // Compiler support.
1836 S * get () { return &s; }
1838 // libstdc++ support.
1839 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1840 #error __cxa_thread_atexit_impl not supported
1843 [libc_cv_cxx_thread_local=yes],
1844 [libc_cv_cxx_thread_local=no])
1845 CXXFLAGS="$old_CXXFLAGS"
1847 AC_SUBST(libc_cv_cxx_thread_local)
1850 dnl End of C++ feature tests.
1852 ### End of automated tests.
1853 ### Now run sysdeps configure fragments.
1855 # They also can set these variables.
1857 ldd_rewrite_script=no
1858 libc_cv_sysconfdir=$sysconfdir
1859 libc_cv_localstatedir=$localstatedir
1860 libc_cv_gcc_unwind_find_fde=no
1863 # Iterate over all the sysdep directories we will use, running their
1864 # configure fragments.
1865 for dir in $sysnames; do
1868 *) dest=$srcdir/$dir ;;
1870 if test -r $dest/configure; then
1871 AC_MSG_RESULT(running configure fragment for $dir)
1876 if test x"$build_mathvec" = xnotset; then
1879 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1881 AC_SUBST(libc_extra_cflags)
1882 AC_SUBST(libc_extra_cppflags)
1884 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1885 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1887 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1889 # A sysdeps configure fragment can reset this if IFUNC is not actually
1890 # usable even though the assembler knows how to generate the symbol type.
1891 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1892 AC_DEFINE(HAVE_IFUNC)
1895 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1896 # configure fragment can override the value to prevent this AC_DEFINE.
1898 if test "x$use_nscd" != xno; then
1899 AC_DEFINE([USE_NSCD])
1901 if test "x$build_nscd" = xdefault; then
1902 build_nscd=$use_nscd
1905 # Test for old glibc 2.0.x headers so that they can be removed properly
1906 # Search only in includedir.
1907 AC_MSG_CHECKING(for old glibc 2.0.x headers)
1908 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
1910 old_glibc_headers=yes
1912 old_glibc_headers=no
1914 AC_MSG_RESULT($old_glibc_headers)
1915 if test ${old_glibc_headers} = yes; then
1916 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
1917 AC_MSG_WARN(*** be removed.)
1919 AC_SUBST(old_glibc_headers)
1921 AC_SUBST(libc_cv_slibdir)
1922 AC_SUBST(libc_cv_rtlddir)
1923 AC_SUBST(libc_cv_localedir)
1924 AC_SUBST(libc_cv_sysconfdir)
1925 AC_SUBST(libc_cv_localstatedir)
1926 AC_SUBST(libc_cv_rootsbindir)
1927 AC_SUBST(libc_cv_forced_unwind)
1929 if test x$use_ldconfig = xyes; then
1930 AC_DEFINE(USE_LDCONFIG)
1932 AC_SUBST(use_ldconfig)
1933 AC_SUBST(ldd_rewrite_script)
1938 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1939 [libc_cv_pic_default=yes
1940 cat > conftest.c <<EOF
1941 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1942 # error PIC is default.
1945 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1946 libc_cv_pic_default=no
1949 AC_SUBST(libc_cv_pic_default)
1951 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1952 [libc_cv_pie_default=yes
1953 cat > conftest.c <<EOF
1954 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1955 # error PIE is default.
1958 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1959 libc_cv_pie_default=no
1962 AC_SUBST(libc_cv_pie_default)
1965 AC_SUBST(static_nss)
1969 dnl See sysdeps/mach/configure.ac for this variable.
1970 AC_SUBST(mach_interface_list)
1972 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1973 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1977 AC_CONFIG_FILES([config.make Makefile])
1978 AC_CONFIG_COMMANDS([default],[[
1979 case $CONFIG_FILES in *config.make*)
1980 echo "$config_vars" >> config.make;;
1982 test -d bits || mkdir bits]],[[config_vars='$config_vars']])