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 = $libgd_ldflags"
129 dnl Arguments to specify presence of other packages/features.
130 AC_ARG_WITH([binutils],
131 AC_HELP_STRING([--with-binutils=PATH],
132 [specify location of binutils (as and ld)]),
133 [path_binutils=$withval],
135 AC_ARG_WITH([selinux],
136 AC_HELP_STRING([--with-selinux],
137 [if building with SELinux support]),
138 [with_selinux=$withval],
141 AC_ARG_WITH([headers],
142 AC_HELP_STRING([--with-headers=PATH],
143 [location of system headers to use
144 (for example /usr/src/linux/include)
145 @<:@default=compiler default@:>@]),
146 [sysheaders=$withval],
150 AC_SUBST(use_default_link)
151 AC_ARG_WITH([default-link],
152 AC_HELP_STRING([--with-default-link],
153 [do not use explicit linker scripts]),
154 [use_default_link=$withval],
155 [use_default_link=default])
157 AC_ARG_ENABLE([sanity-checks],
158 AC_HELP_STRING([--disable-sanity-checks],
159 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
160 [enable_sanity=$enableval],
163 AC_ARG_ENABLE([shared],
164 AC_HELP_STRING([--enable-shared],
165 [build shared library @<:@default=yes if GNU ld@:>@]),
168 AC_ARG_ENABLE([profile],
169 AC_HELP_STRING([--enable-profile],
170 [build profiled library @<:@default=no@:>@]),
171 [profile=$enableval],
173 AC_ARG_ENABLE([static-pie],
174 AC_HELP_STRING([--enable-static-pie],
175 [enable static PIE support and use it in the testsuite @<:@default=no@:>@]),
176 [static_pie=$enableval],
178 AC_ARG_ENABLE([timezone-tools],
179 AC_HELP_STRING([--disable-timezone-tools],
180 [do not install timezone tools @<:@default=install@:>@]),
181 [enable_timezone_tools=$enableval],
182 [enable_timezone_tools=yes])
183 AC_SUBST(enable_timezone_tools)
185 AC_ARG_ENABLE([hardcoded-path-in-tests],
186 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
187 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
188 [hardcoded_path_in_tests=$enableval],
189 [hardcoded_path_in_tests=no])
190 AC_SUBST(hardcoded_path_in_tests)
192 AC_ARG_ENABLE([stackguard-randomization],
193 AC_HELP_STRING([--enable-stackguard-randomization],
194 [initialize __stack_chk_guard canary with a random number at program start]),
195 [enable_stackguard_randomize=$enableval],
196 [enable_stackguard_randomize=no])
197 if test "$enable_stackguard_randomize" = yes; then
198 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
201 AC_ARG_ENABLE([hidden-plt],
202 AC_HELP_STRING([--disable-hidden-plt],
203 [do not hide internal function calls to avoid PLT]),
206 if test "x$hidden" = xno; then
210 AC_ARG_ENABLE([bind-now],
211 AC_HELP_STRING([--enable-bind-now],
212 [disable lazy relocations in DSOs]),
213 [bindnow=$enableval],
216 if test "x$bindnow" = xyes; then
220 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
221 dnl -fstack-protector-strong.
222 AC_ARG_ENABLE([stack-protector],
223 AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
224 [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
225 [enable_stack_protector=$enableval],
226 [enable_stack_protector=no])
227 case "$enable_stack_protector" in
228 all|yes|no|strong) ;;
229 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
232 dnl On some platforms we cannot use dynamic loading. We must provide
233 dnl static NSS modules.
234 AC_ARG_ENABLE([static-nss],
235 AC_HELP_STRING([--enable-static-nss],
236 [build static NSS modules @<:@default=no@:>@]),
237 [static_nss=$enableval],
239 dnl Enable static NSS also if we build no shared objects.
240 if test x"$static_nss" = xyes || test x"$shared" = xno; then
242 AC_DEFINE(DO_STATIC_NSS)
245 AC_ARG_ENABLE([force-install],
246 AC_HELP_STRING([--disable-force-install],
247 [don't force installation of files from this package, even if they are older than the installed files]),
248 [force_install=$enableval],
250 AC_SUBST(force_install)
252 AC_ARG_ENABLE([maintainer-mode],
253 AC_HELP_STRING([--enable-maintainer-mode],
254 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
255 [maintainer=$enableval],
258 dnl On some platforms we allow dropping compatibility with all kernel
260 AC_ARG_ENABLE([kernel],
261 AC_HELP_STRING([--enable-kernel=VERSION],
262 [compile for compatibility with kernel not older than VERSION]),
263 [minimum_kernel=$enableval],
265 dnl Prevent unreasonable values.
266 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
267 # Better nothing than this.
270 if test "$minimum_kernel" = current; then
271 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
275 dnl For the development we sometimes want gcc to issue even more warnings.
276 dnl This is not the default since many of the extra warnings are not
278 AC_ARG_ENABLE([all-warnings],
279 AC_HELP_STRING([--enable-all-warnings],
280 [enable all useful warnings gcc can issue]),
281 [all_warnings=$enableval],
283 AC_SUBST(all_warnings)
285 AC_ARG_ENABLE([werror],
286 AC_HELP_STRING([--disable-werror],
287 [do not build with -Werror]),
288 [enable_werror=$enableval],
290 AC_SUBST(enable_werror)
292 AC_ARG_ENABLE([multi-arch],
293 AC_HELP_STRING([--enable-multi-arch],
294 [enable single DSO with optimizations for multiple architectures]),
295 [multi_arch=$enableval],
296 [multi_arch=default])
298 AC_ARG_ENABLE([experimental-malloc],
299 AC_HELP_STRING([--disable-experimental-malloc],
300 [disable experimental malloc features]),
301 [experimental_malloc=$enableval],
302 [experimental_malloc=yes])
303 AC_SUBST(experimental_malloc)
305 AC_ARG_ENABLE([crypt],
306 AC_HELP_STRING([--disable-crypt],
307 [do not build nor install the passphrase hashing library, libcrypt]),
308 [build_crypt=$enableval],
310 AC_SUBST(build_crypt)
312 AC_ARG_ENABLE([nss-crypt],
313 AC_HELP_STRING([--enable-nss-crypt],
314 [enable libcrypt to use nss]),
315 [nss_crypt=$enableval],
317 if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
318 AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
321 if test x$nss_crypt = xyes; then
322 nss_includes=-I$(nss-config --includedir 2>/dev/null)
323 if test $? -ne 0; then
324 AC_MSG_ERROR([cannot find include directory with nss-config])
326 nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
327 if test $? -ne 0; then
328 AC_MSG_ERROR([cannot find include directory with nspr-config])
331 CFLAGS="$CFLAGS $nss_includes $nspr_includes"
332 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
334 #include <nsslowhash.h>
335 void f (void) { NSSLOW_Init (); }])],
336 libc_cv_nss_crypt=yes,
338 cannot find NSS headers with lowlevel hash function interfaces]))
340 old_LDFLAGS="$LDFLAGS"
341 LIBS="$LIBS -lfreebl3"
342 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
344 #include <nsslowhash.h>],
346 libc_cv_nss_crypt=yes,
348 cannot link program using lowlevel NSS hash functions]))
349 # Check to see if there is a static NSS cryptographic library.
350 # If there isn't then we can't link anything with libcrypt.a,
351 # and that might mean disabling some static tests.
352 LDFLAGS="$LDFLAGS -static"
353 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
355 #include <nsslowhash.h>],
357 libc_cv_static_nss_crypt=yes,
358 libc_cv_static_nss_crypt=no)
359 LDFLAGS="$old_LDFLAGS"
364 libc_cv_static_nss_crypt=no
366 AC_SUBST(libc_cv_nss_crypt)
367 AC_SUBST(libc_cv_static_nss_crypt)
370 AC_ARG_ENABLE([obsolete-rpc],
371 AC_HELP_STRING([--enable-obsolete-rpc],
372 [build and install the obsolete RPC code for link-time usage]),
373 [link_obsolete_rpc=$enableval],
374 [link_obsolete_rpc=no])
375 AC_SUBST(link_obsolete_rpc)
377 if test "$link_obsolete_rpc" = yes; then
378 AC_DEFINE(LINK_OBSOLETE_RPC)
381 AC_ARG_ENABLE([obsolete-nsl],
382 AC_HELP_STRING([--enable-obsolete-nsl],
383 [build and install the obsolete libnsl library and depending NSS modules]),
384 [build_obsolete_nsl=$enableval],
385 [build_obsolete_nsl=no])
386 AC_SUBST(build_obsolete_nsl)
388 if test "$build_obsolete_nsl" = yes; then
389 AC_DEFINE(LINK_OBSOLETE_NSL)
392 AC_ARG_ENABLE([systemtap],
393 [AS_HELP_STRING([--enable-systemtap],
394 [enable systemtap static probe points @<:@default=no@:>@])],
395 [systemtap=$enableval],
397 if test "x$systemtap" != xno; then
398 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
400 CFLAGS="-std=gnu11 $CFLAGS"
401 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
402 void foo (int i, void *p)
404 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
405 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
406 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
407 CFLAGS="$old_CFLAGS"])
408 if test $libc_cv_sdt = yes; then
409 AC_DEFINE([USE_STAP_PROBE])
410 elif test "x$systemtap" != xauto; then
411 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
415 AC_ARG_ENABLE([build-nscd],
416 [AS_HELP_STRING([--disable-build-nscd],
417 [disable building and installing the nscd daemon])],
418 [build_nscd=$enableval],
419 [build_nscd=default])
422 # Note the use of $use_nscd is near the bottom of the file.
423 AC_ARG_ENABLE([nscd],
424 [AS_HELP_STRING([--disable-nscd],
425 [library functions will not contact the nscd daemon])],
426 [use_nscd=$enableval],
429 AC_ARG_ENABLE([pt_chown],
430 [AS_HELP_STRING([--enable-pt_chown],
431 [Enable building and installing pt_chown])],
432 [build_pt_chown=$enableval],
434 AC_SUBST(build_pt_chown)
435 if test "$build_pt_chown" = yes; then
436 AC_DEFINE(HAVE_PT_CHOWN)
439 AC_ARG_ENABLE([tunables],
440 [AS_HELP_STRING([--enable-tunables],
441 [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
442 [have_tunables=$enableval],
444 AC_SUBST(have_tunables)
445 if test "$have_tunables" = yes; then
446 AC_DEFINE(HAVE_TUNABLES)
449 # The abi-tags file uses a fairly simplistic model for name recognition that
450 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
451 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
452 # This doesn't get used much beyond that, so it's fairly safe.
457 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
461 AC_ARG_ENABLE([mathvec],
462 [AS_HELP_STRING([--enable-mathvec],
463 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
464 [build_mathvec=$enableval],
465 [build_mathvec=notset])
467 # We keep the original values in `$config_*' and never modify them, so we
468 # can write them unchanged into config.make. Everything else uses
469 # $machine, $vendor, and $os, and changes them whenever convenient.
470 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
472 # Don't allow vendor == "unknown"
473 test "$config_vendor" = unknown && config_vendor=
474 config_os="`echo $config_os | sed 's/^unknown-//'`"
476 # Some configurations imply other options.
479 # The configure fragment of a port can modify these to supplement
480 # or override the table in the case statement below. No fragment should
481 # ever change the config_* variables, however.
482 machine=$config_machine
483 vendor=$config_vendor
489 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
492 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
494 *) submachine="$withval" ;;
498 # An preconfigure script can set this when it wants to disable the sanity
502 # A preconfigure script for a system that may or may not use fpu
503 # sysdeps directories sets this to a preprocessor conditional for
504 # whether to use such directories.
507 dnl Let sysdeps/*/preconfigure act here.
508 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
512 ### By using the undocumented --enable-hacker-mode option for configure
513 ### one can skip this test to make the configuration not fail for unsupported
516 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
517 case "$machine-$host_os" in
522 *** The GNU C library is currently unavailable for this platform.
523 *** If you are interested in seeing glibc on this platform visit
524 *** the "How to submit a new port" in the wiki:
525 *** https://sourceware.org/glibc/wiki/#Development
526 *** and join the community!])
531 # Set base_machine if not set by a preconfigure fragment.
532 test -n "$base_machine" || base_machine=$machine
533 AC_SUBST(base_machine)
535 # Determine whether to use fpu or nofpu sysdeps directories.
536 AC_CACHE_CHECK([for use of fpu sysdeps directories],
537 libc_cv_with_fp, [dnl
538 cat > conftest.c <<EOF
542 # error "no hardware floating point"
546 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
547 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
551 AC_SUBST(libc_cv_with_fp)
553 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
554 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
559 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
560 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
561 [libc_cv_ssp_strong=yes],
562 [libc_cv_ssp_strong=no])
565 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
566 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
567 [libc_cv_ssp_all=yes],
568 [libc_cv_ssp_all=no])
573 if test "$libc_cv_ssp" = yes; then
574 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
575 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
578 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
579 stack_protector="-fstack-protector"
580 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
581 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
582 stack_protector="-fstack-protector-all"
583 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
584 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
585 stack_protector="-fstack-protector-strong"
586 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
588 stack_protector="-fno-stack-protector"
589 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
591 AC_SUBST(libc_cv_ssp)
592 AC_SUBST(stack_protector)
593 AC_SUBST(no_stack_protector)
595 if test -n "$stack_protector"; then
596 dnl Don't run configure tests with stack-protection on, to avoid problems with
598 no_ssp=-fno-stack-protector
602 if test "$enable_stack_protector" != no; then
603 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
607 # For the multi-arch option we need support in the assembler & linker.
608 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
609 libc_cv_ld_gnu_indirect_function, [dnl
610 cat > conftest.S <<EOF
611 .type foo,%gnu_indirect_function
624 libc_cv_ld_gnu_indirect_function=no
625 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
626 -nostartfiles -nostdlib $no_ssp \
627 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
628 # Do a link to see if the backend supports IFUNC relocs.
629 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
630 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
631 libc_cv_ld_gnu_indirect_function=yes
636 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
637 AC_CACHE_CHECK([for gcc attribute ifunc support],
638 libc_cv_gcc_indirect_function, [dnl
639 cat > conftest.c <<EOF
640 extern int func (int);
641 int used_func (int a)
645 static void *resolver ()
649 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
651 libc_cv_gcc_indirect_function=no
652 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
653 2>&AS_MESSAGE_LOG_FD ; then
654 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
655 libc_cv_gcc_indirect_function=yes
660 # Check if gcc warns about alias for function with incompatible types.
661 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
662 libc_cv_gcc_incompatible_alias, [dnl
663 cat > conftest.c <<EOF
664 int __redirect_foo (const void *s, int c);
666 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
667 __typeof (__redirect_foo) *foo_impl (void)
672 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
674 libc_cv_gcc_incompatible_alias=yes
675 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
676 libc_cv_gcc_incompatible_alias=no
680 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
681 if test x"$multi_arch" = xyes; then
682 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
687 if test x"$libc_cv_gcc_indirect_function" != xyes; then
688 # GCC 8+ emits a warning for alias with incompatible types and it might
689 # fail to build ifunc resolvers aliases to either weak or internal
690 # symbols. Disables multiarch build in this case.
691 if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
692 AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
693 if test x"$multi_arch" = xyes; then
694 AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
696 AC_MSG_WARN([Multi-arch is disabled.])
698 elif test x"$multi_arch" = xyes; then
699 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
700 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
704 if test x"$multi_arch" != xno; then
705 multi_arch_d=/multiarch
708 # Compute the list of sysdep directories for this configuration.
709 # This can take a while to compute.
710 sysdep_dir=$srcdir/sysdeps
711 AC_MSG_CHECKING(sysdep dirs)
712 dnl We need to use [ and ] for other purposes for a while now.
714 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
715 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
717 test "x$base_os" != x || case "$os" in
724 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
727 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
731 o=`echo $tail | sed 's/[0-9]*$//'`
732 if test $o != $tail; then
735 # For linux-gnu, try linux-gnu, then linux.
736 o=`echo $tail | sed 's/-.*$//'`
737 if test $o != $tail; then
741 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
744 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
750 # For sparc/sparc32, try sparc/sparc32 and then sparc.
752 tail=$machine${submachine:+/$submachine}
753 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
755 # Prepend the machine's FPU directory unless --without-fp.
756 if test "$libc_cv_with_fp" = yes; then
761 # For each machine term, try it with and then without /multiarch.
762 for try_fpu in $maybe_fpu ''; do
763 for try_multi in $multi_arch_d ''; do
764 mach="$mach /$1$try_fpu$try_multi"
770 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
773 # Find what sysdep directories exist.
775 for b in $base ''; do
776 for m0 in $mach ''; do
777 for v in /$vendor ''; do
778 test "$v" = / && continue
779 for o in /$ostry ''; do
780 test "$o" = / && continue
781 for m in $mach ''; do
782 try_suffix="$m0$b$v$o$m"
783 if test -n "$try_suffix"; then
784 try_srcdir="${srcdir}/"
785 try="sysdeps$try_suffix"
786 test -n "$enable_debug_configure" &&
787 echo "$0 [DEBUG]: try $try" >&2
788 if test -d "$try_srcdir$try"; then
789 sysnames="$sysnames $try"
790 { test -n "$o" || test -n "$b"; } && os_used=t
791 { test -n "$m" || test -n "$m0"; } && machine_used=t
793 x*/$submachine) submachine_used=t ;;
803 # If the assembler supports gnu_indirect_function symbol type and the
804 # architecture supports multi-arch, we enable multi-arch by default.
809 test x"$multi_arch" = xdefault && multi_arch=no
812 if test x"$multi_arch" != xno; then
813 AC_DEFINE(USE_MULTIARCH)
817 if test -z "$os_used" && test "$os" != none; then
818 AC_MSG_ERROR(Operating system $os is not supported.)
820 if test -z "$machine_used" && test "$machine" != none; then
821 AC_MSG_ERROR(The $machine is not supported.)
823 if test -z "$submachine_used" && test -n "$submachine"; then
824 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
828 # We have now validated the configuration.
830 # Expand the list of system names into a full list of directories
831 # from each element's parent name and Implies file (if present).
834 while test $# -gt 0; do
838 case " $names " in *" $name "*)
839 # Already in the list.
843 # Report each name as we discover it, so there is no long pause in output.
844 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
846 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
850 *) xsrcdir=$srcdir/ ;;
852 test -n "$enable_debug_configure" &&
853 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
855 for implies_file in Implies Implies-before Implies-after; do
856 implies_type=`echo $implies_file | sed s/-/_/`
857 eval ${implies_type}=
858 if test -f $xsrcdir$name/$implies_file; then
859 # Collect more names from the `Implies' file (removing comments).
860 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
861 for x in $implied_candidate; do
863 if test -d $xsrcdir$name_base/$x; then
864 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
869 test -n "$enable_debug_configure" &&
870 echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
871 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
873 eval "${implies_type}=\"\$${implies_type} \$try\""
876 if test $found = no; then
877 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
883 # Add NAME to the list of names.
886 # Find the parent of NAME, using the empty string if it has none.
888 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
891 test -n "$enable_debug_configure" &&
892 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
893 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
895 # Add the names implied by NAME, and NAME's parent (if it has one), to
896 # the list of names to be processed (the argument list). We prepend the
897 # implied names to the list and append the parent. We want implied
898 # directories to come before further directories inferred from the
899 # configuration components; this ensures that for sysv4, unix/common
900 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
902 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
903 test -n "$sysnames" && set $sysnames
906 # Add the default directories.
907 default_sysnames="sysdeps/generic"
908 sysnames="$names $default_sysnames"
910 # The other names were emitted during the scan.
911 AC_MSG_RESULT($default_sysnames)
917 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
918 # The makefiles need to use a different form to find it in $srcdir.
919 INSTALL='\$(..)./scripts/install-sh -c'
925 # Accept binutils 2.25 or newer.
926 AC_CHECK_PROG_VER(AS, $AS, --version,
927 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
928 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
929 AS=: critic_missing="$critic_missing as")
931 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
932 # Accept gold 1.14 or higher
933 AC_CHECK_PROG_VER(LD, $LD, --version,
934 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
935 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
936 LD=: critic_missing="$critic_missing GNU gold")
938 AC_CHECK_PROG_VER(LD, $LD, --version,
939 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
940 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
941 LD=: critic_missing="$critic_missing GNU ld")
944 # These programs are version sensitive.
946 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
947 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
948 [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
950 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
951 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
952 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
953 MSGFMT=: aux_missing="$aux_missing msgfmt")
954 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
955 [GNU texinfo.* \([0-9][0-9.]*\)],
956 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
957 MAKEINFO=: aux_missing="$aux_missing makeinfo")
958 AC_CHECK_PROG_VER(SED, sed, --version,
959 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
960 [3.0[2-9]*|3.[1-9]*|[4-9]*],
961 SED=: aux_missing="$aux_missing sed")
962 AC_CHECK_PROG_VER(AWK, gawk, --version,
963 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
964 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
965 AC_CHECK_PROG_VER(BISON, bison, --version,
966 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
967 [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
969 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
971 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
972 #error insufficient compiler
974 [libc_cv_compiler_ok=yes],
975 [libc_cv_compiler_ok=no])])
976 AS_IF([test $libc_cv_compiler_ok != yes],
977 [critic_missing="$critic_missing compiler"])
979 AC_CHECK_TOOL(NM, nm, false)
981 if test "x$maintainer" = "xyes"; then
982 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
984 xno|x|x:) AUTOCONF=no ;;
987 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
988 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
989 libc_cv_autoconf_works=yes
991 libc_cv_autoconf_works=no
993 test $libc_cv_autoconf_works = yes || AUTOCONF=no
996 if test "x$AUTOCONF" = xno; then
997 aux_missing="$aux_missing autoconf"
1003 # Check for python3 if available, or else python.
1004 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1005 case "x$PYTHON_PROG" in
1006 xno|x|x:) PYTHON_PROG=no ;;
1010 if test "x$PYTHON_PROG" = xno; then
1011 aux_missing="$aux_missing python"
1013 PYTHON="$PYTHON_PROG -B"
1017 test -n "$critic_missing" && AC_MSG_ERROR([
1018 *** These critical programs are missing or too old:$critic_missing
1019 *** Check the INSTALL file for required versions.])
1021 test -n "$aux_missing" && AC_MSG_WARN([
1022 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1023 *** some features or tests will be disabled.
1024 *** Check the INSTALL file for required versions.])
1026 # if using special system headers, find out the compiler's sekrit
1027 # header directory and add that to the list. NOTE: Only does the right
1028 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1029 if test -n "$sysheaders"; then
1030 SYSINCLUDES=-nostdinc
1031 for d in include include-fixed; do
1032 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1033 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1035 SYSINCLUDES="$SYSINCLUDES \
1036 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1037 if test -n "$CXX"; then
1039 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1040 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1041 test "x$cxxheaders" != x &&
1042 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1046 AC_SUBST(SYSINCLUDES)
1047 AC_SUBST(CXX_SYSINCLUDES)
1049 # Obtain some C++ header file paths. This is used to make a local
1050 # copy of those headers in Makerules.
1051 if test -n "$CXX"; then
1052 find_cxx_header () {
1053 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1054 | sed -n "\,$1:,{s/:\$//;p}"
1056 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1057 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1058 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1060 AC_SUBST(CXX_CSTDLIB_HEADER)
1061 AC_SUBST(CXX_CMATH_HEADER)
1062 AC_SUBST(CXX_BITS_STD_ABS_H)
1064 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1065 # since this would lead to problems installing/building glibc.
1066 # LD_LIBRARY_PATH contains the current directory if one of the following
1068 # - one of the terminals (":" and ";") is the first or last sign
1069 # - two terminals occur directly after each other
1070 # - the path contains an element with a dot in it
1071 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1073 case ${LD_LIBRARY_PATH} in
1074 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1075 ld_library_path_setting="contains current directory"
1078 ld_library_path_setting="ok"
1082 AC_MSG_RESULT($ld_library_path_setting)
1083 if test "$ld_library_path_setting" != "ok"; then
1085 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1086 *** building glibc. Please change the environment variable
1087 *** and run configure again.])
1090 AC_PATH_PROG(BASH_SHELL, bash, no)
1092 AC_PATH_PROG(PERL, perl, no)
1093 if test "$PERL" != no &&
1094 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1097 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1098 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1100 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1101 cat > conftest.s <<EOF
1104 .set glibc_conftest_frobozz,foo
1105 .globl glibc_conftest_frobozz
1107 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1108 # (but it doesn't work), so we must do a linking check to be sure.
1109 cat > conftest1.c <<\EOF
1110 extern int glibc_conftest_frobozz;
1111 void _start() { glibc_conftest_frobozz = 1; }
1113 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1114 -nostartfiles -nostdlib $no_ssp \
1115 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1116 libc_cv_asm_set_directive=yes
1118 libc_cv_asm_set_directive=no
1121 if test $libc_cv_asm_set_directive = yes; then
1122 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1125 AC_CACHE_CHECK(linker support for protected data symbol,
1126 libc_cv_protected_data,
1127 [cat > conftest.c <<EOF
1128 int bar __attribute__ ((visibility ("protected"))) = 1;
1130 libc_cv_protected_data=no
1131 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1132 cat > conftest.c <<EOF
1134 int main (void) { return bar; }
1136 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1137 libc_cv_protected_data=yes
1142 AC_SUBST(libc_cv_protected_data)
1144 AC_CACHE_CHECK(linker support for INSERT in linker script,
1146 [cat > conftest.c <<EOF
1147 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1148 int test (void) { return bar; }
1150 cat > conftest.t <<EOF
1155 INSERT AFTER .rela.dyn;
1158 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1163 AC_SUBST(libc_cv_insert)
1165 AC_CACHE_CHECK(for broken __attribute__((alias())),
1166 libc_cv_broken_alias_attribute,
1167 [cat > conftest.c <<EOF
1168 extern int foo (int x) __asm ("xyzzy");
1169 int bar (int x) { return x; }
1170 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1172 extern __typeof (dfoo) dfoo __asm ("abccb");
1175 libc_cv_broken_alias_attribute=yes
1176 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1177 if grep 'xyzzy' conftest.s >/dev/null &&
1178 grep 'abccb' conftest.s >/dev/null; then
1179 libc_cv_broken_alias_attribute=no
1182 rm -f conftest.c conftest.s
1184 if test $libc_cv_broken_alias_attribute = yes; then
1185 AC_MSG_ERROR(working alias attribute support required)
1188 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1189 libc_cv_have_sdata_section,
1190 [echo "int i;" > conftest.c
1191 libc_cv_have_sdata_section=no
1192 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1193 | grep '\.sdata' >/dev/null; then
1194 libc_cv_have_sdata_section=yes
1196 rm -f conftest.c conftest.so
1198 if test $libc_cv_have_sdata_section = yes; then
1199 AC_DEFINE(HAVE_SDATA_SECTION)
1202 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1203 libc_cv_ctors_header, [dnl
1204 libc_cv_ctors_header=yes
1205 LIBC_TRY_LINK_STATIC([
1206 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1207 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1210 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1211 { gsub(/\@<:@ */, "@<:@") }
1212 $2 == ".ctors" || $2 == ".dtors" {
1213 size = strtonum("0x" $6)
1214 align = strtonum("0x" $NF)
1216 stub@<:@$2@:>@ = size == align * 2
1219 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1220 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1221 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1223 '], [libc_cv_ctors_header=no])
1225 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1228 if test $libc_cv_ctors_header = no; then
1229 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1232 AC_CACHE_CHECK(for libunwind-support in compiler,
1233 libc_cv_cc_with_libunwind, [
1234 cat > conftest.c <<EOF
1235 int main (void) { return 0; }
1237 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1238 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1239 libc_cv_cc_with_libunwind=yes
1241 libc_cv_cc_with_libunwind=no
1244 AC_SUBST(libc_cv_cc_with_libunwind)
1245 if test $libc_cv_cc_with_libunwind = yes; then
1246 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1250 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1251 libc_cv_as_noexecstack, [dnl
1252 cat > conftest.c <<EOF
1255 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1256 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1257 && grep .note.GNU-stack conftest.s >/dev/null \
1258 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1259 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1261 libc_cv_as_noexecstack=yes
1263 libc_cv_as_noexecstack=no
1266 if test $libc_cv_as_noexecstack = yes; then
1267 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1269 AC_SUBST(ASFLAGS_config)
1271 AC_CACHE_CHECK(for -z combreloc,
1272 libc_cv_z_combreloc, [dnl
1273 cat > conftest.c <<EOF
1274 extern int bar (int);
1276 int foo (void) { return bar (mumble); }
1278 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1279 -fPIC -shared $no_ssp -o conftest.so conftest.c
1280 -nostdlib -nostartfiles
1281 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1283 dnl The following test is a bit weak. We must use a tool which can test
1284 dnl cross-platform since the gcc used can be a cross compiler. Without
1285 dnl introducing new options this is not easily doable. Instead use a tool
1286 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1287 dnl look for a section named .rel.dyn or .rela.dyn.
1288 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1289 libc_cv_z_combreloc=yes
1291 libc_cv_z_combreloc=no
1294 libc_cv_z_combreloc=no
1297 if test "$libc_cv_z_combreloc" = yes; then
1298 AC_DEFINE(HAVE_Z_COMBRELOC)
1300 AC_SUBST(libc_cv_z_combreloc)
1302 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1303 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1304 AC_SUBST(libc_cv_z_execstack)
1306 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1307 [-Wl,--no-dynamic-linker],
1308 [libc_cv_no_dynamic_linker=yes],
1309 [libc_cv_no_dynamic_linker=no])
1310 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1312 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1313 LIBC_TRY_CC_OPTION([-static-pie],
1314 [libc_cv_static_pie=yes],
1315 [libc_cv_static_pie=no])
1317 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1319 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1320 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1323 AC_SUBST(libc_cv_fpie)
1325 AC_CACHE_CHECK(for --hash-style option,
1326 libc_cv_hashstyle, [dnl
1327 cat > conftest.c <<EOF
1328 int _start (void) { return 42; }
1330 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1331 -fPIC -shared -o conftest.so conftest.c
1332 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1334 libc_cv_hashstyle=yes
1336 libc_cv_hashstyle=no
1339 AC_SUBST(libc_cv_hashstyle)
1341 # The linker's default -shared behavior is good enough if it
1342 # does these things that our custom linker scripts ensure that
1343 # all allocated NOTE sections come first.
1344 if test "$use_default_link" = default; then
1345 AC_CACHE_CHECK([for sufficient default -shared layout],
1346 libc_cv_use_default_link, [dnl
1347 libc_cv_use_default_link=no
1348 cat > conftest.s <<\EOF
1349 .section .note.a,"a",%note
1354 .section .note.b,"a",%note
1360 if AC_TRY_COMMAND([dnl
1361 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1362 ac_try=`$READELF -S conftest.so | sed -n \
1364 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1370 libc_seen_a=no libc_seen_b=no
1372 while test $# -ge 2 -a "$1" = NOTE; do
1374 .note.a) libc_seen_a=yes ;;
1375 .note.b) libc_seen_b=yes ;;
1379 case "$libc_seen_a$libc_seen_b" in
1381 libc_cv_use_default_link=yes
1384 echo >&AS_MESSAGE_LOG_FD "\
1385 $libc_seen_a$libc_seen_b from:
1391 use_default_link=$libc_cv_use_default_link
1394 AC_CACHE_CHECK(for GLOB_DAT reloc,
1395 libc_cv_has_glob_dat, [dnl
1396 cat > conftest.c <<EOF
1398 int foo (void) { return mumble; }
1400 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1401 -fPIC -shared -o conftest.so conftest.c
1402 -nostdlib -nostartfiles $no_ssp
1403 1>&AS_MESSAGE_LOG_FD])
1405 dnl look for GLOB_DAT relocation.
1406 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1407 libc_cv_has_glob_dat=yes
1409 libc_cv_has_glob_dat=no
1412 libc_cv_has_glob_dat=no
1415 AC_SUBST(libc_cv_has_glob_dat)
1417 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1418 if libc_cv_output_format=`
1419 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1423 libc_cv_output_format=
1425 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1426 AC_SUBST(libc_cv_output_format)
1428 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1429 cat > conftest.c <<EOF
1432 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1433 conftest.c 1>&AS_MESSAGE_LOG_FD])
1435 libc_cv_fno_toplevel_reorder=yes
1437 libc_cv_fno_toplevel_reorder=no
1440 if test $libc_cv_fno_toplevel_reorder = yes; then
1441 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1443 fno_unit_at_a_time=-fno-unit-at-a-time
1445 AC_SUBST(fno_unit_at_a_time)
1447 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1449 cat > conftest.c <<EOF
1456 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1457 conftest.c 1>&AS_MESSAGE_LOG_FD])
1459 libc_cv_mtls_dialect_gnu2=yes
1461 libc_cv_mtls_dialect_gnu2=no
1464 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1465 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1467 AC_CACHE_CHECK(whether cc puts quotes around section names,
1468 libc_cv_have_section_quotes,
1469 [cat > conftest.c <<EOF
1470 static const int foo
1471 __attribute__ ((section ("bar"))) = 1;
1473 if ${CC-cc} -S conftest.c -o conftest.s; then
1474 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1475 libc_cv_have_section_quotes=yes
1477 libc_cv_have_section_quotes=no
1480 libc_cv_have_section_quotes=unknown
1482 rm -f conftest.{c,s}
1484 if test $libc_cv_have_section_quotes = yes; then
1485 AC_DEFINE(HAVE_SECTION_QUOTES)
1488 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1489 cat > conftest.c <<\EOF
1492 __builtin_memset (x, 0, 1000);
1496 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1498 libc_cv_gcc_builtin_memset=no
1500 libc_cv_gcc_builtin_memset=yes
1503 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1504 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1507 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1508 cat > conftest.c <<\EOF
1509 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1510 char *foo (const char *a, const char *b)
1512 return __builtin_strstr (a, b);
1516 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1518 libc_cv_gcc_builtin_redirection=yes
1520 libc_cv_gcc_builtin_redirection=no
1523 if test "$libc_cv_gcc_builtin_redirection" = no; then
1524 AC_MSG_ERROR([support for the symbol redirection needed])
1527 dnl Determine how to disable generation of FMA instructions.
1528 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1529 libc_cv_cc_nofma, [dnl
1531 for opt in -ffp-contract=off -mno-fused-madd; do
1532 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1534 AC_SUBST(libc_cv_cc_nofma)
1536 if test -n "$submachine"; then
1537 AC_CACHE_CHECK([for compiler option for CPU variant],
1538 libc_cv_cc_submachine, [dnl
1539 libc_cv_cc_submachine=no
1540 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1541 LIBC_TRY_CC_OPTION([$opt], [
1542 libc_cv_cc_submachine="$opt"
1545 if test "x$libc_cv_cc_submachine" = xno; then
1546 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1549 AC_SUBST(libc_cv_cc_submachine)
1551 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1552 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1553 cat > conftest.c <<EOF
1555 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1558 libc_cv_cc_loop_to_function=no
1559 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1561 libc_cv_cc_loop_to_function=yes
1564 if test $libc_cv_cc_loop_to_function = yes; then
1565 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1567 AC_SUBST(libc_cv_cc_loop_to_function)
1569 dnl Check whether we have the gd library available.
1570 AC_MSG_CHECKING(for libgd)
1571 if test "$with_gd" != "no"; then
1572 old_CFLAGS="$CFLAGS"
1573 CFLAGS="$CFLAGS $libgd_include"
1574 old_LDFLAGS="$LDFLAGS"
1575 LDFLAGS="$LDFLAGS $libgd_ldflags"
1577 LIBS="$LIBS -lgd -lpng -lz -lm"
1578 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1579 CFLAGS="$old_CFLAGS"
1580 LDFLAGS="$old_LDFLAGS"
1585 AC_MSG_RESULT($LIBGD)
1589 if test x$with_selinux = xno ; then
1592 # See if we have the SELinux library
1593 AC_CHECK_LIB(selinux, is_selinux_enabled,
1594 have_selinux=yes, have_selinux=no)
1595 if test x$with_selinux = xyes ; then
1596 if test x$have_selinux = xno ; then
1597 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1601 # Check if we're building with SELinux support.
1602 if test "x$have_selinux" = xyes; then
1603 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1605 # See if we have the libaudit library
1606 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1607 have_libaudit=yes, have_libaudit=no)
1608 if test "x$have_libaudit" = xyes; then
1609 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1611 AC_SUBST(have_libaudit)
1613 # See if we have the libcap library
1614 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1615 if test "x$have_libcap" = xyes; then
1616 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1618 AC_SUBST(have_libcap)
1620 AC_SUBST(have_selinux)
1623 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1624 dnl Since we are building the implementations of the fortified functions here,
1625 dnl having the macro defined interacts very badly.
1626 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1627 [AC_TRY_COMPILE([], [
1628 #ifdef _FORTIFY_SOURCE
1631 [libc_cv_predef_fortify_source=no],
1632 [libc_cv_predef_fortify_source=yes])])
1633 if test $libc_cv_predef_fortify_source = yes; then
1634 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1638 # Some linkers on some architectures support __ehdr_start but with
1639 # bugs. Make sure usage of it does not create relocations in the
1640 # output (as the linker should resolve them all for us).
1641 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1642 libc_cv_ehdr_start, [
1643 old_CFLAGS="$CFLAGS"
1644 old_LDFLAGS="$LDFLAGS"
1646 CFLAGS="$CFLAGS -fPIC"
1647 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1649 AC_LINK_IFELSE([AC_LANG_SOURCE([
1654 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1655 long ehdr (void) { return __ehdr_start.val; }
1657 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1658 libc_cv_ehdr_start=broken
1660 libc_cv_ehdr_start=yes
1661 fi], [libc_cv_ehdr_start=no])
1662 CFLAGS="$old_CFLAGS"
1663 LDFLAGS="$old_LDFLAGS"
1666 if test "$libc_cv_ehdr_start" = yes; then
1667 AC_DEFINE([HAVE_EHDR_START])
1668 elif test "$libc_cv_ehdr_start" = broken; then
1669 AC_MSG_WARN([linker is broken -- you should upgrade])
1672 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1673 libc_cv_builtin_trap, [dnl
1674 libc_cv_builtin_trap=no
1675 AC_TRY_COMPILE([], [__builtin_trap ()], [
1676 libc_undefs=`$NM -u conftest.o |
1677 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1678 2>&AS_MESSAGE_LOG_FD` || {
1679 AC_MSG_ERROR([confusing output from $NM -u])
1681 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1682 if test -z "$libc_undefs"; then
1683 libc_cv_builtin_trap=yes
1685 if test $libc_cv_builtin_trap = yes; then
1686 AC_DEFINE([HAVE_BUILTIN_TRAP])
1689 dnl C++ feature tests.
1692 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1693 libc_cv_cxx_thread_local, [
1694 old_CXXFLAGS="$CXXFLAGS"
1695 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1696 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1699 // Compiler support.
1706 S * get () { return &s; }
1708 // libstdc++ support.
1709 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1710 #error __cxa_thread_atexit_impl not supported
1713 [libc_cv_cxx_thread_local=yes],
1714 [libc_cv_cxx_thread_local=no])
1715 CXXFLAGS="$old_CXXFLAGS"
1717 AC_SUBST(libc_cv_cxx_thread_local)
1720 dnl End of C++ feature tests.
1722 ### End of automated tests.
1723 ### Now run sysdeps configure fragments.
1725 # They also can set these variables.
1727 ldd_rewrite_script=no
1728 libc_cv_sysconfdir=$sysconfdir
1729 libc_cv_localstatedir=$localstatedir
1730 libc_cv_gcc_unwind_find_fde=no
1733 # Iterate over all the sysdep directories we will use, running their
1734 # configure fragments.
1735 for dir in $sysnames; do
1738 *) dest=$srcdir/$dir ;;
1740 if test -r $dest/configure; then
1741 AC_MSG_RESULT(running configure fragment for $dir)
1746 if test x"$build_mathvec" = xnotset; then
1749 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1751 AC_SUBST(libc_extra_cflags)
1752 AC_SUBST(libc_extra_cppflags)
1754 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1755 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1757 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1759 # A sysdeps configure fragment can reset this if IFUNC is not actually
1760 # usable even though the assembler knows how to generate the symbol type.
1761 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1762 AC_DEFINE(HAVE_IFUNC)
1765 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1766 AC_DEFINE(HAVE_GCC_IFUNC)
1769 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1770 # configure fragment can override the value to prevent this AC_DEFINE.
1772 if test "x$use_nscd" != xno; then
1773 AC_DEFINE([USE_NSCD])
1775 if test "x$build_nscd" = xdefault; then
1776 build_nscd=$use_nscd
1779 AC_SUBST(libc_cv_slibdir)
1780 AC_SUBST(libc_cv_rtlddir)
1781 AC_SUBST(libc_cv_complocaledir)
1782 AC_SUBST(libc_cv_sysconfdir)
1783 AC_SUBST(libc_cv_localstatedir)
1784 AC_SUBST(libc_cv_rootsbindir)
1786 if test x$use_ldconfig = xyes; then
1787 AC_DEFINE(USE_LDCONFIG)
1789 AC_SUBST(use_ldconfig)
1790 AC_SUBST(ldd_rewrite_script)
1795 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1796 [libc_cv_pic_default=yes
1797 cat > conftest.c <<EOF
1798 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1799 # error PIC is default.
1802 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1803 libc_cv_pic_default=no
1806 AC_SUBST(libc_cv_pic_default)
1808 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1809 [libc_cv_cc_pie_default=yes
1810 cat > conftest.c <<EOF
1811 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1812 # error PIE is default.
1815 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1816 libc_cv_cc_pie_default=no
1819 libc_cv_pie_default=$libc_cv_cc_pie_default
1820 AC_SUBST(libc_cv_cc_pie_default)
1821 AC_SUBST(libc_cv_pie_default)
1823 # Set the `multidir' variable by grabbing the variable from the compiler.
1824 # We do it once and save the result in a generated makefile.
1825 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1826 AC_SUBST(libc_cv_multidir)
1828 if test "$static_pie" = yes; then
1829 # The linker must support --no-dynamic-linker.
1830 if test "$libc_cv_no_dynamic_linker" != yes; then
1831 AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1834 libc_cv_pie_default=yes
1835 AC_DEFINE(ENABLE_STATIC_PIE)
1837 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1840 AC_SUBST(static_nss)
1844 dnl See sysdeps/mach/configure.ac for this variable.
1845 AC_SUBST(mach_interface_list)
1847 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1848 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1852 AC_CONFIG_FILES([config.make Makefile])
1853 AC_CONFIG_COMMANDS([default],[[
1854 case $CONFIG_FILES in *config.make*)
1855 echo "$config_vars" >> config.make;;
1857 test -d bits || mkdir bits]],[[config_vars='$config_vars']])