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)], [https://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 # <https://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 # <https://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 $srcdir; pwd -P`" = "`pwd -P`"; then
84 AC_MSG_ERROR([you must configure in a separate build directory])
87 # This will get text that should go into config.make.
90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
92 AC_HELP_STRING([--with-gd=DIR],
93 [find libgd include dir and library with prefix DIR]),
97 *) libgd_include="-I$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 "$enable_stackguard_randomize" = yes; then
199 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
202 AC_ARG_ENABLE([hidden-plt],
203 AC_HELP_STRING([--disable-hidden-plt],
204 [do not hide internal function calls to avoid PLT]),
207 if test "x$hidden" = xno; then
211 AC_ARG_ENABLE([bind-now],
212 AC_HELP_STRING([--enable-bind-now],
213 [disable lazy relocations in DSOs]),
214 [bindnow=$enableval],
217 if test "x$bindnow" = xyes; then
221 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
222 dnl -fstack-protector-strong.
223 AC_ARG_ENABLE([stack-protector],
224 AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
225 [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
226 [enable_stack_protector=$enableval],
227 [enable_stack_protector=no])
228 case "$enable_stack_protector" in
229 all|yes|no|strong) ;;
230 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
233 dnl On some platforms we cannot use dynamic loading. We must provide
234 dnl static NSS modules.
235 AC_ARG_ENABLE([static-nss],
236 AC_HELP_STRING([--enable-static-nss],
237 [build static NSS modules @<:@default=no@:>@]),
238 [static_nss=$enableval],
240 dnl Enable static NSS also if we build no shared objects.
241 if test x"$static_nss" = xyes || test x"$shared" = xno; then
243 AC_DEFINE(DO_STATIC_NSS)
246 AC_ARG_ENABLE([force-install],
247 AC_HELP_STRING([--disable-force-install],
248 [don't force installation of files from this package, even if they are older than the installed files]),
249 [force_install=$enableval],
251 AC_SUBST(force_install)
253 AC_ARG_ENABLE([maintainer-mode],
254 AC_HELP_STRING([--enable-maintainer-mode],
255 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
256 [maintainer=$enableval],
259 dnl On some platforms we allow dropping compatibility with all kernel
261 AC_ARG_ENABLE([kernel],
262 AC_HELP_STRING([--enable-kernel=VERSION],
263 [compile for compatibility with kernel not older than VERSION]),
264 [minimum_kernel=$enableval],
266 dnl Prevent unreasonable values.
267 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
268 # Better nothing than this.
271 if test "$minimum_kernel" = current; then
272 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
276 dnl For the development we sometimes want gcc to issue even more warnings.
277 dnl This is not the default since many of the extra warnings are not
279 AC_ARG_ENABLE([all-warnings],
280 AC_HELP_STRING([--enable-all-warnings],
281 [enable all useful warnings gcc can issue]),
282 [all_warnings=$enableval],
284 AC_SUBST(all_warnings)
286 AC_ARG_ENABLE([werror],
287 AC_HELP_STRING([--disable-werror],
288 [do not build with -Werror]),
289 [enable_werror=$enableval],
291 AC_SUBST(enable_werror)
293 AC_ARG_ENABLE([multi-arch],
294 AC_HELP_STRING([--enable-multi-arch],
295 [enable single DSO with optimizations for multiple architectures]),
296 [multi_arch=$enableval],
297 [multi_arch=default])
299 AC_ARG_ENABLE([experimental-malloc],
300 AC_HELP_STRING([--disable-experimental-malloc],
301 [disable experimental malloc features]),
302 [experimental_malloc=$enableval],
303 [experimental_malloc=yes])
304 AC_SUBST(experimental_malloc)
306 AC_ARG_ENABLE([nss-crypt],
307 AC_HELP_STRING([--enable-nss-crypt],
308 [enable libcrypt to use nss]),
309 [nss_crypt=$enableval],
311 if test x$nss_crypt = xyes; then
312 nss_includes=-I$(nss-config --includedir 2>/dev/null)
313 if test $? -ne 0; then
314 AC_MSG_ERROR([cannot find include directory with nss-config])
316 nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
317 if test $? -ne 0; then
318 AC_MSG_ERROR([cannot find include directory with nspr-config])
321 CFLAGS="$CFLAGS $nss_includes $nspr_includes"
322 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
324 #include <nsslowhash.h>
325 void f (void) { NSSLOW_Init (); }])],
326 libc_cv_nss_crypt=yes,
328 cannot find NSS headers with lowlevel hash function interfaces]))
330 old_LDFLAGS="$LDFLAGS"
331 LIBS="$LIBS -lfreebl3"
332 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
334 #include <nsslowhash.h>],
336 libc_cv_nss_crypt=yes,
338 cannot link program using lowlevel NSS hash functions]))
339 # Check to see if there is a static NSS cryptographic library.
340 # If there isn't then we can't link anything with libcrypt.a,
341 # and that might mean disabling some static tests.
342 LDFLAGS="$LDFLAGS -static"
343 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
345 #include <nsslowhash.h>],
347 libc_cv_static_nss_crypt=yes,
348 libc_cv_static_nss_crypt=no)
349 LDFLAGS="$old_LDFLAGS"
354 libc_cv_static_nss_crypt=no
356 AC_SUBST(libc_cv_nss_crypt)
357 AC_SUBST(libc_cv_static_nss_crypt)
360 AC_ARG_ENABLE([obsolete-rpc],
361 AC_HELP_STRING([--enable-obsolete-rpc],
362 [build and install the obsolete RPC code for link-time usage]),
363 [link_obsolete_rpc=$enableval],
364 [link_obsolete_rpc=no])
365 AC_SUBST(link_obsolete_rpc)
367 if test "$link_obsolete_rpc" = yes; then
368 AC_DEFINE(LINK_OBSOLETE_RPC)
371 AC_ARG_ENABLE([obsolete-nsl],
372 AC_HELP_STRING([--enable-obsolete-nsl],
373 [build and install the obsolete libnsl library and depending NSS modules]),
374 [build_obsolete_nsl=$enableval],
375 [build_obsolete_nsl=no])
376 AC_SUBST(build_obsolete_nsl)
378 if test "$build_obsolete_nsl" = yes; then
379 AC_DEFINE(LINK_OBSOLETE_NSL)
382 AC_ARG_ENABLE([systemtap],
383 [AS_HELP_STRING([--enable-systemtap],
384 [enable systemtap static probe points @<:@default=no@:>@])],
385 [systemtap=$enableval],
387 if test "x$systemtap" != xno; then
388 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
390 CFLAGS="-std=gnu11 $CFLAGS"
391 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
392 void foo (int i, void *p)
394 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
395 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
396 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
397 CFLAGS="$old_CFLAGS"])
398 if test $libc_cv_sdt = yes; then
399 AC_DEFINE([USE_STAP_PROBE])
400 elif test "x$systemtap" != xauto; then
401 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
405 AC_ARG_ENABLE([build-nscd],
406 [AS_HELP_STRING([--disable-build-nscd],
407 [disable building and installing the nscd daemon])],
408 [build_nscd=$enableval],
409 [build_nscd=default])
412 # Note the use of $use_nscd is near the bottom of the file.
413 AC_ARG_ENABLE([nscd],
414 [AS_HELP_STRING([--disable-nscd],
415 [library functions will not contact the nscd daemon])],
416 [use_nscd=$enableval],
419 AC_ARG_ENABLE([pt_chown],
420 [AS_HELP_STRING([--enable-pt_chown],
421 [Enable building and installing pt_chown])],
422 [build_pt_chown=$enableval],
424 AC_SUBST(build_pt_chown)
425 if test "$build_pt_chown" = yes; then
426 AC_DEFINE(HAVE_PT_CHOWN)
429 AC_ARG_ENABLE([tunables],
430 [AS_HELP_STRING([--enable-tunables],
431 [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
432 [have_tunables=$enableval],
434 AC_SUBST(have_tunables)
435 if test "$have_tunables" = yes; then
436 AC_DEFINE(HAVE_TUNABLES)
439 # The abi-tags file uses a fairly simplistic model for name recognition that
440 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
441 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
442 # This doesn't get used much beyond that, so it's fairly safe.
447 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
451 AC_ARG_ENABLE([mathvec],
452 [AS_HELP_STRING([--enable-mathvec],
453 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
454 [build_mathvec=$enableval],
455 [build_mathvec=notset])
457 # We keep the original values in `$config_*' and never modify them, so we
458 # can write them unchanged into config.make. Everything else uses
459 # $machine, $vendor, and $os, and changes them whenever convenient.
460 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
462 # Don't allow vendor == "unknown"
463 test "$config_vendor" = unknown && config_vendor=
464 config_os="`echo $config_os | sed 's/^unknown-//'`"
466 # Some configurations imply other options.
469 # The configure fragment of a port can modify these to supplement
470 # or override the table in the case statement below. No fragment should
471 # ever change the config_* variables, however.
472 machine=$config_machine
473 vendor=$config_vendor
479 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
482 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
484 *) submachine="$withval" ;;
488 # An preconfigure script can set this when it wants to disable the sanity
492 dnl Let sysdeps/*/preconfigure act here.
493 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
497 ### By using the undocumented --enable-hacker-mode option for configure
498 ### one can skip this test to make the configuration not fail for unsupported
501 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
502 case "$machine-$host_os" in
507 *** The GNU C library is currently unavailable for this platform.
508 *** If you are interested in seeing glibc on this platform visit
509 *** the "How to submit a new port" in the wiki:
510 *** https://sourceware.org/glibc/wiki/#Development
511 *** and join the community!])
516 # Set base_machine if not set by a preconfigure fragment.
517 test -n "$base_machine" || base_machine=$machine
518 AC_SUBST(base_machine)
520 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
521 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
526 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
527 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
528 [libc_cv_ssp_strong=yes],
529 [libc_cv_ssp_strong=no])
532 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
533 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
534 [libc_cv_ssp_all=yes],
535 [libc_cv_ssp_all=no])
540 if test "$libc_cv_ssp" = yes; then
541 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
542 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
545 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
546 stack_protector="-fstack-protector"
547 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
548 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
549 stack_protector="-fstack-protector-all"
550 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
551 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
552 stack_protector="-fstack-protector-strong"
553 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
555 stack_protector="-fno-stack-protector"
556 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
558 AC_SUBST(libc_cv_ssp)
559 AC_SUBST(stack_protector)
560 AC_SUBST(no_stack_protector)
562 if test -n "$stack_protector"; then
563 dnl Don't run configure tests with stack-protection on, to avoid problems with
565 no_ssp=-fno-stack-protector
569 if test "$enable_stack_protector" != no; then
570 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
574 # For the multi-arch option we need support in the assembler & linker.
575 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
576 libc_cv_ld_gnu_indirect_function, [dnl
577 cat > conftest.S <<EOF
578 .type foo,%gnu_indirect_function
591 libc_cv_ld_gnu_indirect_function=no
592 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
593 -nostartfiles -nostdlib $no_ssp \
594 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
595 # Do a link to see if the backend supports IFUNC relocs.
596 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
597 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
598 libc_cv_ld_gnu_indirect_function=yes
603 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
604 AC_CACHE_CHECK([for gcc attribute ifunc support],
605 libc_cv_gcc_indirect_function, [dnl
606 cat > conftest.c <<EOF
607 extern int func (int);
608 int used_func (int a)
612 static void *resolver ()
616 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
618 libc_cv_gcc_indirect_function=no
619 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
620 2>&AS_MESSAGE_LOG_FD ; then
621 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
622 libc_cv_gcc_indirect_function=yes
627 # Check if gcc warns about alias for function with incompatible types.
628 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
629 libc_cv_gcc_incompatible_alias, [dnl
630 cat > conftest.c <<EOF
631 int __redirect_foo (const void *s, int c);
633 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
634 __typeof (__redirect_foo) *foo_impl (void)
639 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
641 libc_cv_gcc_incompatible_alias=yes
642 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
643 libc_cv_gcc_incompatible_alias=no
647 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
648 if test x"$multi_arch" = xyes; then
649 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
654 if test x"$libc_cv_gcc_indirect_function" != xyes; then
655 # GCC 8+ emits a warning for alias with incompatible types and it might
656 # fail to build ifunc resolvers aliases to either weak or internal
657 # symbols. Disables multiarch build in this case.
658 if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
659 AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
660 if test x"$multi_arch" = xyes; then
661 AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
663 AC_MSG_WARN([Multi-arch is disabled.])
665 elif test x"$multi_arch" = xyes; then
666 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
667 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
671 if test x"$multi_arch" != xno; then
672 multi_arch_d=/multiarch
675 # Compute the list of sysdep directories for this configuration.
676 # This can take a while to compute.
677 sysdep_dir=$srcdir/sysdeps
678 AC_MSG_CHECKING(sysdep dirs)
679 dnl We need to use [ and ] for other purposes for a while now.
681 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
682 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
684 test "x$base_os" != x || case "$os" in
691 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
694 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
698 o=`echo $tail | sed 's/[0-9]*$//'`
699 if test $o != $tail; then
702 # For linux-gnu, try linux-gnu, then linux.
703 o=`echo $tail | sed 's/-.*$//'`
704 if test $o != $tail; then
708 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
711 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
717 # For sparc/sparc32, try sparc/sparc32 and then sparc.
719 tail=$machine${submachine:+/$submachine}
720 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
722 # Prepend the machine's FPU directory unless --without-fp.
723 if test "$with_fp" = yes; then
728 # For each machine term, try it with and then without /multiarch.
729 for try_fpu in $maybe_fpu ''; do
730 for try_multi in $multi_arch_d ''; do
731 mach="$mach /$1$try_fpu$try_multi"
737 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
740 # Find what sysdep directories exist.
742 for b in $base ''; do
743 for m0 in $mach ''; do
744 for v in /$vendor ''; do
745 test "$v" = / && continue
746 for o in /$ostry ''; do
747 test "$o" = / && continue
748 for m in $mach ''; do
749 try_suffix="$m0$b$v$o$m"
750 if test -n "$try_suffix"; then
751 try_srcdir="${srcdir}/"
752 try="sysdeps$try_suffix"
753 test -n "$enable_debug_configure" &&
754 echo "$0 [DEBUG]: try $try" >&2
755 if test -d "$try_srcdir$try"; then
756 sysnames="$sysnames $try"
757 { test -n "$o" || test -n "$b"; } && os_used=t
758 { test -n "$m" || test -n "$m0"; } && machine_used=t
760 x*/$submachine) submachine_used=t ;;
770 # If the assembler supports gnu_indirect_function symbol type and the
771 # architecture supports multi-arch, we enable multi-arch by default.
776 test x"$multi_arch" = xdefault && multi_arch=no
779 if test x"$multi_arch" != xno; then
780 AC_DEFINE(USE_MULTIARCH)
784 if test -z "$os_used" && test "$os" != none; then
785 AC_MSG_ERROR(Operating system $os is not supported.)
787 if test -z "$machine_used" && test "$machine" != none; then
788 AC_MSG_ERROR(The $machine is not supported.)
790 if test -z "$submachine_used" && test -n "$submachine"; then
791 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
795 # We have now validated the configuration.
797 # Expand the list of system names into a full list of directories
798 # from each element's parent name and Implies file (if present).
801 while test $# -gt 0; do
805 case " $names " in *" $name "*)
806 # Already in the list.
810 # Report each name as we discover it, so there is no long pause in output.
811 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
813 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
817 *) xsrcdir=$srcdir/ ;;
819 test -n "$enable_debug_configure" &&
820 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
822 for implies_file in Implies Implies-before Implies-after; do
823 implies_type=`echo $implies_file | sed s/-/_/`
824 eval ${implies_type}=
825 if test -f $xsrcdir$name/$implies_file; then
826 # Collect more names from the `Implies' file (removing comments).
827 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
828 for x in $implied_candidate; do
830 if test -d $xsrcdir$name_base/$x; then
831 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
836 test -n "$enable_debug_configure" &&
837 echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
838 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
840 eval "${implies_type}=\"\$${implies_type} \$try\""
843 if test $found = no; then
844 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
850 # Add NAME to the list of names.
853 # Find the parent of NAME, using the empty string if it has none.
855 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
858 test -n "$enable_debug_configure" &&
859 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
860 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
862 # Add the names implied by NAME, and NAME's parent (if it has one), to
863 # the list of names to be processed (the argument list). We prepend the
864 # implied names to the list and append the parent. We want implied
865 # directories to come before further directories inferred from the
866 # configuration components; this ensures that for sysv4, unix/common
867 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
869 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
870 test -n "$sysnames" && set $sysnames
873 # Add the default directories.
874 default_sysnames="sysdeps/generic"
875 sysnames="$names $default_sysnames"
877 # The other names were emitted during the scan.
878 AC_MSG_RESULT($default_sysnames)
884 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
885 # The makefiles need to use a different form to find it in $srcdir.
886 INSTALL='\$(..)./scripts/install-sh -c'
892 # Accept binutils 2.25 or newer.
893 AC_CHECK_PROG_VER(AS, $AS, --version,
894 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
895 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
896 AS=: critic_missing="$critic_missing as")
898 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
899 # Accept gold 1.14 or higher
900 AC_CHECK_PROG_VER(LD, $LD, --version,
901 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
902 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
903 LD=: critic_missing="$critic_missing GNU gold")
905 AC_CHECK_PROG_VER(LD, $LD, --version,
906 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
907 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
908 LD=: critic_missing="$critic_missing GNU ld")
911 # These programs are version sensitive.
913 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
914 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
915 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
917 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
918 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
919 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
920 MSGFMT=: aux_missing="$aux_missing msgfmt")
921 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
922 [GNU texinfo.* \([0-9][0-9.]*\)],
923 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
924 MAKEINFO=: aux_missing="$aux_missing makeinfo")
925 AC_CHECK_PROG_VER(SED, sed, --version,
926 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
927 [3.0[2-9]*|3.[1-9]*|[4-9]*],
928 SED=: aux_missing="$aux_missing sed")
929 AC_CHECK_PROG_VER(AWK, gawk, --version,
930 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
931 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
932 AC_CHECK_PROG_VER(BISON, bison, --version,
933 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
934 [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
936 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
938 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
939 #error insufficient compiler
941 [libc_cv_compiler_ok=yes],
942 [libc_cv_compiler_ok=no])])
943 AS_IF([test $libc_cv_compiler_ok != yes],
944 [critic_missing="$critic_missing compiler"])
946 AC_CHECK_TOOL(NM, nm, false)
948 if test "x$maintainer" = "xyes"; then
949 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
951 xno|x|x:) AUTOCONF=no ;;
954 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
955 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
956 libc_cv_autoconf_works=yes
958 libc_cv_autoconf_works=no
960 test $libc_cv_autoconf_works = yes || AUTOCONF=no
963 if test "x$AUTOCONF" = xno; then
964 aux_missing="$aux_missing autoconf"
970 # Check for python3 if available, or else python.
971 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
972 case "x$PYTHON_PROG" in
973 xno|x|x:) PYTHON_PROG=no ;;
977 if test "x$PYTHON_PROG" = xno; then
978 aux_missing="$aux_missing python"
980 PYTHON="$PYTHON_PROG -B"
984 test -n "$critic_missing" && AC_MSG_ERROR([
985 *** These critical programs are missing or too old:$critic_missing
986 *** Check the INSTALL file for required versions.])
988 test -n "$aux_missing" && AC_MSG_WARN([
989 *** These auxiliary programs are missing or incompatible versions:$aux_missing
990 *** some features or tests will be disabled.
991 *** Check the INSTALL file for required versions.])
993 # if using special system headers, find out the compiler's sekrit
994 # header directory and add that to the list. NOTE: Only does the right
995 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
996 if test -n "$sysheaders"; then
997 SYSINCLUDES=-nostdinc
998 for d in include include-fixed; do
999 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1000 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1002 SYSINCLUDES="$SYSINCLUDES \
1003 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1004 if test -n "$CXX"; then
1006 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1007 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1008 test "x$cxxheaders" != x &&
1009 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1013 AC_SUBST(SYSINCLUDES)
1014 AC_SUBST(CXX_SYSINCLUDES)
1016 # Obtain some C++ header file paths. This is used to make a local
1017 # copy of those headers in Makerules.
1018 if test -n "$CXX"; then
1019 find_cxx_header () {
1020 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1021 | sed -n "\,$1:,{s/:\$//;p}"
1023 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1024 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1025 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1027 AC_SUBST(CXX_CSTDLIB_HEADER)
1028 AC_SUBST(CXX_CMATH_HEADER)
1029 AC_SUBST(CXX_BITS_STD_ABS_H)
1031 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1032 # since this would lead to problems installing/building glibc.
1033 # LD_LIBRARY_PATH contains the current directory if one of the following
1035 # - one of the terminals (":" and ";") is the first or last sign
1036 # - two terminals occur directly after each other
1037 # - the path contains an element with a dot in it
1038 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1040 case ${LD_LIBRARY_PATH} in
1041 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1042 ld_library_path_setting="contains current directory"
1045 ld_library_path_setting="ok"
1049 AC_MSG_RESULT($ld_library_path_setting)
1050 if test "$ld_library_path_setting" != "ok"; then
1052 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1053 *** building glibc. Please change the environment variable
1054 *** and run configure again.])
1057 AC_PATH_PROG(BASH_SHELL, bash, no)
1059 AC_PATH_PROG(PERL, perl, no)
1060 if test "$PERL" != no &&
1061 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1064 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1065 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1067 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1068 cat > conftest.s <<EOF
1071 .set glibc_conftest_frobozz,foo
1072 .globl glibc_conftest_frobozz
1074 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1075 # (but it doesn't work), so we must do a linking check to be sure.
1076 cat > conftest1.c <<\EOF
1077 extern int glibc_conftest_frobozz;
1078 void _start() { glibc_conftest_frobozz = 1; }
1080 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1081 -nostartfiles -nostdlib $no_ssp \
1082 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1083 libc_cv_asm_set_directive=yes
1085 libc_cv_asm_set_directive=no
1088 if test $libc_cv_asm_set_directive = yes; then
1089 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1092 AC_CACHE_CHECK(linker support for protected data symbol,
1093 libc_cv_protected_data,
1094 [cat > conftest.c <<EOF
1095 int bar __attribute__ ((visibility ("protected"))) = 1;
1097 libc_cv_protected_data=no
1098 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1099 cat > conftest.c <<EOF
1101 int main (void) { return bar; }
1103 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1104 libc_cv_protected_data=yes
1109 AC_SUBST(libc_cv_protected_data)
1111 AC_CACHE_CHECK(linker support for INSERT in linker script,
1113 [cat > conftest.c <<EOF
1114 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1115 int test (void) { return bar; }
1117 cat > conftest.t <<EOF
1122 INSERT AFTER .rela.dyn;
1125 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1130 AC_SUBST(libc_cv_insert)
1132 AC_CACHE_CHECK(for broken __attribute__((alias())),
1133 libc_cv_broken_alias_attribute,
1134 [cat > conftest.c <<EOF
1135 extern int foo (int x) __asm ("xyzzy");
1136 int bar (int x) { return x; }
1137 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1139 extern __typeof (dfoo) dfoo __asm ("abccb");
1142 libc_cv_broken_alias_attribute=yes
1143 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1144 if grep 'xyzzy' conftest.s >/dev/null &&
1145 grep 'abccb' conftest.s >/dev/null; then
1146 libc_cv_broken_alias_attribute=no
1149 rm -f conftest.c conftest.s
1151 if test $libc_cv_broken_alias_attribute = yes; then
1152 AC_MSG_ERROR(working alias attribute support required)
1155 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1156 libc_cv_have_sdata_section,
1157 [echo "int i;" > conftest.c
1158 libc_cv_have_sdata_section=no
1159 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1160 | grep '\.sdata' >/dev/null; then
1161 libc_cv_have_sdata_section=yes
1163 rm -f conftest.c conftest.so
1165 if test $libc_cv_have_sdata_section = yes; then
1166 AC_DEFINE(HAVE_SDATA_SECTION)
1169 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1170 libc_cv_ctors_header, [dnl
1171 libc_cv_ctors_header=yes
1172 LIBC_TRY_LINK_STATIC([
1173 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1174 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1177 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1178 { gsub(/\@<:@ */, "@<:@") }
1179 $2 == ".ctors" || $2 == ".dtors" {
1180 size = strtonum("0x" $6)
1181 align = strtonum("0x" $NF)
1183 stub@<:@$2@:>@ = size == align * 2
1186 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1187 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1188 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1190 '], [libc_cv_ctors_header=no])
1192 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1195 if test $libc_cv_ctors_header = no; then
1196 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1199 AC_CACHE_CHECK(for libunwind-support in compiler,
1200 libc_cv_cc_with_libunwind, [
1201 cat > conftest.c <<EOF
1202 int main (void) { return 0; }
1204 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1205 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1206 libc_cv_cc_with_libunwind=yes
1208 libc_cv_cc_with_libunwind=no
1211 AC_SUBST(libc_cv_cc_with_libunwind)
1212 if test $libc_cv_cc_with_libunwind = yes; then
1213 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1217 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1218 libc_cv_as_noexecstack, [dnl
1219 cat > conftest.c <<EOF
1222 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1223 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1224 && grep .note.GNU-stack conftest.s >/dev/null \
1225 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1226 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1228 libc_cv_as_noexecstack=yes
1230 libc_cv_as_noexecstack=no
1233 if test $libc_cv_as_noexecstack = yes; then
1234 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1236 AC_SUBST(ASFLAGS_config)
1238 AC_CACHE_CHECK(for -z combreloc,
1239 libc_cv_z_combreloc, [dnl
1240 cat > conftest.c <<EOF
1241 extern int bar (int);
1243 int foo (void) { return bar (mumble); }
1245 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1246 -fPIC -shared $no_ssp -o conftest.so conftest.c
1247 -nostdlib -nostartfiles
1248 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1250 dnl The following test is a bit weak. We must use a tool which can test
1251 dnl cross-platform since the gcc used can be a cross compiler. Without
1252 dnl introducing new options this is not easily doable. Instead use a tool
1253 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1254 dnl look for a section named .rel.dyn or .rela.dyn.
1255 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1256 libc_cv_z_combreloc=yes
1258 libc_cv_z_combreloc=no
1261 libc_cv_z_combreloc=no
1264 if test "$libc_cv_z_combreloc" = yes; then
1265 AC_DEFINE(HAVE_Z_COMBRELOC)
1267 AC_SUBST(libc_cv_z_combreloc)
1269 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1270 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1271 AC_SUBST(libc_cv_z_execstack)
1273 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1274 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1277 AC_SUBST(libc_cv_fpie)
1279 AC_CACHE_CHECK(for --hash-style option,
1280 libc_cv_hashstyle, [dnl
1281 cat > conftest.c <<EOF
1282 int _start (void) { return 42; }
1284 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1285 -fPIC -shared -o conftest.so conftest.c
1286 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1288 libc_cv_hashstyle=yes
1290 libc_cv_hashstyle=no
1293 AC_SUBST(libc_cv_hashstyle)
1295 # The linker's default -shared behavior is good enough if it
1296 # does these things that our custom linker scripts ensure that
1297 # all allocated NOTE sections come first.
1298 if test "$use_default_link" = default; then
1299 AC_CACHE_CHECK([for sufficient default -shared layout],
1300 libc_cv_use_default_link, [dnl
1301 libc_cv_use_default_link=no
1302 cat > conftest.s <<\EOF
1303 .section .note.a,"a",%note
1308 .section .note.b,"a",%note
1314 if AC_TRY_COMMAND([dnl
1315 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1316 ac_try=`$READELF -S conftest.so | sed -n \
1318 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1324 libc_seen_a=no libc_seen_b=no
1326 while test $# -ge 2 -a "$1" = NOTE; do
1328 .note.a) libc_seen_a=yes ;;
1329 .note.b) libc_seen_b=yes ;;
1333 case "$libc_seen_a$libc_seen_b" in
1335 libc_cv_use_default_link=yes
1338 echo >&AS_MESSAGE_LOG_FD "\
1339 $libc_seen_a$libc_seen_b from:
1345 use_default_link=$libc_cv_use_default_link
1348 AC_CACHE_CHECK(for GLOB_DAT reloc,
1349 libc_cv_has_glob_dat, [dnl
1350 cat > conftest.c <<EOF
1352 int foo (void) { return mumble; }
1354 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1355 -fPIC -shared -o conftest.so conftest.c
1356 -nostdlib -nostartfiles $no_ssp
1357 1>&AS_MESSAGE_LOG_FD])
1359 dnl look for GLOB_DAT relocation.
1360 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1361 libc_cv_has_glob_dat=yes
1363 libc_cv_has_glob_dat=no
1366 libc_cv_has_glob_dat=no
1369 AC_SUBST(libc_cv_has_glob_dat)
1371 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1372 if libc_cv_output_format=`
1373 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1377 libc_cv_output_format=
1379 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1380 AC_SUBST(libc_cv_output_format)
1382 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1383 cat > conftest.c <<EOF
1386 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1387 conftest.c 1>&AS_MESSAGE_LOG_FD])
1389 libc_cv_fno_toplevel_reorder=yes
1391 libc_cv_fno_toplevel_reorder=no
1394 if test $libc_cv_fno_toplevel_reorder = yes; then
1395 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1397 fno_unit_at_a_time=-fno-unit-at-a-time
1399 AC_SUBST(fno_unit_at_a_time)
1401 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1403 cat > conftest.c <<EOF
1410 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1411 conftest.c 1>&AS_MESSAGE_LOG_FD])
1413 libc_cv_mtls_dialect_gnu2=yes
1415 libc_cv_mtls_dialect_gnu2=no
1418 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1419 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1421 AC_CACHE_CHECK(whether cc puts quotes around section names,
1422 libc_cv_have_section_quotes,
1423 [cat > conftest.c <<EOF
1424 static const int foo
1425 __attribute__ ((section ("bar"))) = 1;
1427 if ${CC-cc} -S conftest.c -o conftest.s; then
1428 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1429 libc_cv_have_section_quotes=yes
1431 libc_cv_have_section_quotes=no
1434 libc_cv_have_section_quotes=unknown
1436 rm -f conftest.{c,s}
1438 if test $libc_cv_have_section_quotes = yes; then
1439 AC_DEFINE(HAVE_SECTION_QUOTES)
1442 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1443 cat > conftest.c <<\EOF
1446 __builtin_memset (x, 0, 1000);
1450 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1452 libc_cv_gcc_builtin_memset=no
1454 libc_cv_gcc_builtin_memset=yes
1457 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1458 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1461 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1462 cat > conftest.c <<\EOF
1463 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1464 char *foo (const char *a, const char *b)
1466 return __builtin_strstr (a, b);
1470 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1472 libc_cv_gcc_builtin_redirection=yes
1474 libc_cv_gcc_builtin_redirection=no
1477 if test "$libc_cv_gcc_builtin_redirection" = no; then
1478 AC_MSG_ERROR([support for the symbol redirection needed])
1481 dnl Determine how to disable generation of FMA instructions.
1482 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1483 libc_cv_cc_nofma, [dnl
1485 for opt in -ffp-contract=off -mno-fused-madd; do
1486 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1488 AC_SUBST(libc_cv_cc_nofma)
1490 if test -n "$submachine"; then
1491 AC_CACHE_CHECK([for compiler option for CPU variant],
1492 libc_cv_cc_submachine, [dnl
1493 libc_cv_cc_submachine=no
1494 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1495 LIBC_TRY_CC_OPTION([$opt], [
1496 libc_cv_cc_submachine="$opt"
1499 if test "x$libc_cv_cc_submachine" = xno; then
1500 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1503 AC_SUBST(libc_cv_cc_submachine)
1505 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1506 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1507 cat > conftest.c <<EOF
1509 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1512 libc_cv_cc_loop_to_function=no
1513 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1515 libc_cv_cc_loop_to_function=yes
1518 if test $libc_cv_cc_loop_to_function = yes; then
1519 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1521 AC_SUBST(libc_cv_cc_loop_to_function)
1523 dnl Check whether we have the gd library available.
1524 AC_MSG_CHECKING(for libgd)
1525 if test "$with_gd" != "no"; then
1526 old_CFLAGS="$CFLAGS"
1527 CFLAGS="$CFLAGS $libgd_include"
1528 old_LDFLAGS="$LDFLAGS"
1529 LDFLAGS="$LDFLAGS $libgd_ldflags"
1531 LIBS="$LIBS -lgd -lpng -lz -lm"
1532 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1533 CFLAGS="$old_CFLAGS"
1534 LDFLAGS="$old_LDFLAGS"
1539 AC_MSG_RESULT($LIBGD)
1543 if test x$with_selinux = xno ; then
1546 # See if we have the SELinux library
1547 AC_CHECK_LIB(selinux, is_selinux_enabled,
1548 have_selinux=yes, have_selinux=no)
1549 if test x$with_selinux = xyes ; then
1550 if test x$have_selinux = xno ; then
1551 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1555 # Check if we're building with SELinux support.
1556 if test "x$have_selinux" = xyes; then
1557 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1559 # See if we have the libaudit library
1560 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1561 have_libaudit=yes, have_libaudit=no)
1562 if test "x$have_libaudit" = xyes; then
1563 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1565 AC_SUBST(have_libaudit)
1567 # See if we have the libcap library
1568 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1569 if test "x$have_libcap" = xyes; then
1570 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1572 AC_SUBST(have_libcap)
1574 AC_SUBST(have_selinux)
1577 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1578 dnl Since we are building the implementations of the fortified functions here,
1579 dnl having the macro defined interacts very badly.
1580 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1581 [AC_TRY_COMPILE([], [
1582 #ifdef _FORTIFY_SOURCE
1585 [libc_cv_predef_fortify_source=no],
1586 [libc_cv_predef_fortify_source=yes])])
1587 if test $libc_cv_predef_fortify_source = yes; then
1588 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1592 # Some linkers on some architectures support __ehdr_start but with
1593 # bugs. Make sure usage of it does not create relocations in the
1594 # output (as the linker should resolve them all for us).
1595 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1596 libc_cv_ehdr_start, [
1597 old_CFLAGS="$CFLAGS"
1598 old_LDFLAGS="$LDFLAGS"
1600 CFLAGS="$CFLAGS -fPIC"
1601 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1603 AC_LINK_IFELSE([AC_LANG_SOURCE([
1608 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1609 long ehdr (void) { return __ehdr_start.val; }
1611 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1612 libc_cv_ehdr_start=broken
1614 libc_cv_ehdr_start=yes
1615 fi], [libc_cv_ehdr_start=no])
1616 CFLAGS="$old_CFLAGS"
1617 LDFLAGS="$old_LDFLAGS"
1620 if test "$libc_cv_ehdr_start" = yes; then
1621 AC_DEFINE([HAVE_EHDR_START])
1622 elif test "$libc_cv_ehdr_start" = broken; then
1623 AC_MSG_WARN([linker is broken -- you should upgrade])
1626 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1627 libc_cv_builtin_trap, [dnl
1628 libc_cv_builtin_trap=no
1629 AC_TRY_COMPILE([], [__builtin_trap ()], [
1630 libc_undefs=`$NM -u conftest.o |
1631 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1632 2>&AS_MESSAGE_LOG_FD` || {
1633 AC_MSG_ERROR([confusing output from $NM -u])
1635 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1636 if test -z "$libc_undefs"; then
1637 libc_cv_builtin_trap=yes
1639 if test $libc_cv_builtin_trap = yes; then
1640 AC_DEFINE([HAVE_BUILTIN_TRAP])
1643 dnl C++ feature tests.
1646 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1647 libc_cv_cxx_thread_local, [
1648 old_CXXFLAGS="$CXXFLAGS"
1649 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1650 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1653 // Compiler support.
1660 S * get () { return &s; }
1662 // libstdc++ support.
1663 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1664 #error __cxa_thread_atexit_impl not supported
1667 [libc_cv_cxx_thread_local=yes],
1668 [libc_cv_cxx_thread_local=no])
1669 CXXFLAGS="$old_CXXFLAGS"
1671 AC_SUBST(libc_cv_cxx_thread_local)
1674 dnl End of C++ feature tests.
1676 ### End of automated tests.
1677 ### Now run sysdeps configure fragments.
1679 # They also can set these variables.
1681 ldd_rewrite_script=no
1682 libc_cv_sysconfdir=$sysconfdir
1683 libc_cv_localstatedir=$localstatedir
1684 libc_cv_gcc_unwind_find_fde=no
1687 # Iterate over all the sysdep directories we will use, running their
1688 # configure fragments.
1689 for dir in $sysnames; do
1692 *) dest=$srcdir/$dir ;;
1694 if test -r $dest/configure; then
1695 AC_MSG_RESULT(running configure fragment for $dir)
1700 if test x"$build_mathvec" = xnotset; then
1703 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1705 AC_SUBST(libc_extra_cflags)
1706 AC_SUBST(libc_extra_cppflags)
1708 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1709 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1711 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1713 # A sysdeps configure fragment can reset this if IFUNC is not actually
1714 # usable even though the assembler knows how to generate the symbol type.
1715 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1716 AC_DEFINE(HAVE_IFUNC)
1719 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1720 AC_DEFINE(HAVE_GCC_IFUNC)
1723 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1724 # configure fragment can override the value to prevent this AC_DEFINE.
1726 if test "x$use_nscd" != xno; then
1727 AC_DEFINE([USE_NSCD])
1729 if test "x$build_nscd" = xdefault; then
1730 build_nscd=$use_nscd
1733 AC_SUBST(libc_cv_slibdir)
1734 AC_SUBST(libc_cv_rtlddir)
1735 AC_SUBST(libc_cv_complocaledir)
1736 AC_SUBST(libc_cv_sysconfdir)
1737 AC_SUBST(libc_cv_localstatedir)
1738 AC_SUBST(libc_cv_rootsbindir)
1740 if test x$use_ldconfig = xyes; then
1741 AC_DEFINE(USE_LDCONFIG)
1743 AC_SUBST(use_ldconfig)
1744 AC_SUBST(ldd_rewrite_script)
1749 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1750 [libc_cv_pic_default=yes
1751 cat > conftest.c <<EOF
1752 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1753 # error PIC is default.
1756 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1757 libc_cv_pic_default=no
1760 AC_SUBST(libc_cv_pic_default)
1762 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1763 [libc_cv_pie_default=yes
1764 cat > conftest.c <<EOF
1765 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1766 # error PIE is default.
1769 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1770 libc_cv_pie_default=no
1773 AC_SUBST(libc_cv_pie_default)
1775 # Set the `multidir' variable by grabbing the variable from the compiler.
1776 # We do it once and save the result in a generated makefile.
1777 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1778 AC_SUBST(libc_cv_multidir)
1781 AC_SUBST(static_nss)
1785 dnl See sysdeps/mach/configure.ac for this variable.
1786 AC_SUBST(mach_interface_list)
1788 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1789 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1793 AC_CONFIG_FILES([config.make Makefile])
1794 AC_CONFIG_COMMANDS([default],[[
1795 case $CONFIG_FILES in *config.make*)
1796 echo "$config_vars" >> config.make;;
1798 test -d bits || mkdir bits]],[[config_vars='$config_vars']])