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])
468 AC_HELP_STRING([--enable-cet],
469 [enable Intel Control-flow Enforcement Technology (CET), x86 only]),
470 [enable_cet=$enableval],
473 # We keep the original values in `$config_*' and never modify them, so we
474 # can write them unchanged into config.make. Everything else uses
475 # $machine, $vendor, and $os, and changes them whenever convenient.
476 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
478 # Don't allow vendor == "unknown"
479 test "$config_vendor" = unknown && config_vendor=
480 config_os="`echo $config_os | sed 's/^unknown-//'`"
482 # Some configurations imply other options.
485 # The configure fragment of a port can modify these to supplement
486 # or override the table in the case statement below. No fragment should
487 # ever change the config_* variables, however.
488 machine=$config_machine
489 vendor=$config_vendor
495 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
498 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
500 *) submachine="$withval" ;;
504 # An preconfigure script can set this when it wants to disable the sanity
508 # A preconfigure script for a system that may or may not use fpu
509 # sysdeps directories sets this to a preprocessor conditional for
510 # whether to use such directories.
513 dnl Let sysdeps/*/preconfigure act here.
514 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
518 ### By using the undocumented --enable-hacker-mode option for configure
519 ### one can skip this test to make the configuration not fail for unsupported
522 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
523 case "$machine-$host_os" in
528 *** The GNU C library is currently unavailable for this platform.
529 *** If you are interested in seeing glibc on this platform visit
530 *** the "How to submit a new port" in the wiki:
531 *** https://sourceware.org/glibc/wiki/#Development
532 *** and join the community!])
537 # Set base_machine if not set by a preconfigure fragment.
538 test -n "$base_machine" || base_machine=$machine
539 AC_SUBST(base_machine)
541 # Determine whether to use fpu or nofpu sysdeps directories.
542 AC_CACHE_CHECK([for use of fpu sysdeps directories],
543 libc_cv_with_fp, [dnl
544 cat > conftest.c <<EOF
548 # error "no hardware floating point"
552 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
553 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
557 AC_SUBST(libc_cv_with_fp)
559 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
560 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
565 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
566 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
567 [libc_cv_ssp_strong=yes],
568 [libc_cv_ssp_strong=no])
571 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
572 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
573 [libc_cv_ssp_all=yes],
574 [libc_cv_ssp_all=no])
579 if test "$libc_cv_ssp" = yes; then
580 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
581 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
584 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
585 stack_protector="-fstack-protector"
586 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
587 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
588 stack_protector="-fstack-protector-all"
589 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
590 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
591 stack_protector="-fstack-protector-strong"
592 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
594 stack_protector="-fno-stack-protector"
595 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
597 AC_SUBST(libc_cv_ssp)
598 AC_SUBST(stack_protector)
599 AC_SUBST(no_stack_protector)
601 if test -n "$stack_protector"; then
602 dnl Don't run configure tests with stack-protection on, to avoid problems with
604 no_ssp=-fno-stack-protector
608 if test "$enable_stack_protector" != no; then
609 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
613 # For the multi-arch option we need support in the assembler & linker.
614 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
615 libc_cv_ld_gnu_indirect_function, [dnl
616 cat > conftest.S <<EOF
617 .type foo,%gnu_indirect_function
630 libc_cv_ld_gnu_indirect_function=no
631 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
632 -nostartfiles -nostdlib $no_ssp \
633 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
634 # Do a link to see if the backend supports IFUNC relocs.
635 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
636 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
637 libc_cv_ld_gnu_indirect_function=yes
642 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
643 AC_CACHE_CHECK([for gcc attribute ifunc support],
644 libc_cv_gcc_indirect_function, [dnl
645 cat > conftest.c <<EOF
646 extern int func (int);
647 int used_func (int a)
651 static void *resolver ()
655 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
657 libc_cv_gcc_indirect_function=no
658 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
659 2>&AS_MESSAGE_LOG_FD ; then
660 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
661 libc_cv_gcc_indirect_function=yes
666 # Check if gcc warns about alias for function with incompatible types.
667 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
668 libc_cv_gcc_incompatible_alias, [dnl
669 cat > conftest.c <<EOF
670 int __redirect_foo (const void *s, int c);
672 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
673 __typeof (__redirect_foo) *foo_impl (void)
678 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
680 libc_cv_gcc_incompatible_alias=yes
681 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
682 libc_cv_gcc_incompatible_alias=no
686 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
687 if test x"$multi_arch" = xyes; then
688 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
693 if test x"$libc_cv_gcc_indirect_function" != xyes; then
694 # GCC 8+ emits a warning for alias with incompatible types and it might
695 # fail to build ifunc resolvers aliases to either weak or internal
696 # symbols. Disables multiarch build in this case.
697 if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
698 AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
699 if test x"$multi_arch" = xyes; then
700 AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
702 AC_MSG_WARN([Multi-arch is disabled.])
704 elif test x"$multi_arch" = xyes; then
705 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
706 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
710 if test x"$multi_arch" != xno; then
711 multi_arch_d=/multiarch
714 # Compute the list of sysdep directories for this configuration.
715 # This can take a while to compute.
716 sysdep_dir=$srcdir/sysdeps
717 AC_MSG_CHECKING(sysdep dirs)
718 dnl We need to use [ and ] for other purposes for a while now.
720 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
721 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
723 test "x$base_os" != x || case "$os" in
730 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
733 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
737 o=`echo $tail | sed 's/[0-9]*$//'`
738 if test $o != $tail; then
741 # For linux-gnu, try linux-gnu, then linux.
742 o=`echo $tail | sed 's/-.*$//'`
743 if test $o != $tail; then
747 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
750 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
756 # For sparc/sparc32, try sparc/sparc32 and then sparc.
758 tail=$machine${submachine:+/$submachine}
759 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
761 # Prepend the machine's FPU directory unless --without-fp.
762 if test "$libc_cv_with_fp" = yes; then
767 # For each machine term, try it with and then without /multiarch.
768 for try_fpu in $maybe_fpu ''; do
769 for try_multi in $multi_arch_d ''; do
770 mach="$mach /$1$try_fpu$try_multi"
776 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
779 # Find what sysdep directories exist.
781 for b in $base ''; do
782 for m0 in $mach ''; do
783 for v in /$vendor ''; do
784 test "$v" = / && continue
785 for o in /$ostry ''; do
786 test "$o" = / && continue
787 for m in $mach ''; do
788 try_suffix="$m0$b$v$o$m"
789 if test -n "$try_suffix"; then
790 try_srcdir="${srcdir}/"
791 try="sysdeps$try_suffix"
792 test -n "$enable_debug_configure" &&
793 echo "$0 [DEBUG]: try $try" >&2
794 if test -d "$try_srcdir$try"; then
795 sysnames="$sysnames $try"
796 { test -n "$o" || test -n "$b"; } && os_used=t
797 { test -n "$m" || test -n "$m0"; } && machine_used=t
799 x*/$submachine) submachine_used=t ;;
809 # If the assembler supports gnu_indirect_function symbol type and the
810 # architecture supports multi-arch, we enable multi-arch by default.
815 test x"$multi_arch" = xdefault && multi_arch=no
818 if test x"$multi_arch" != xno; then
819 AC_DEFINE(USE_MULTIARCH)
823 if test -z "$os_used" && test "$os" != none; then
824 AC_MSG_ERROR(Operating system $os is not supported.)
826 if test -z "$machine_used" && test "$machine" != none; then
827 AC_MSG_ERROR(The $machine is not supported.)
829 if test -z "$submachine_used" && test -n "$submachine"; then
830 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
834 # We have now validated the configuration.
836 # Expand the list of system names into a full list of directories
837 # from each element's parent name and Implies file (if present).
840 while test $# -gt 0; do
844 case " $names " in *" $name "*)
845 # Already in the list.
849 # Report each name as we discover it, so there is no long pause in output.
850 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
852 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
856 *) xsrcdir=$srcdir/ ;;
858 test -n "$enable_debug_configure" &&
859 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
861 for implies_file in Implies Implies-before Implies-after; do
862 implies_type=`echo $implies_file | sed s/-/_/`
863 eval ${implies_type}=
864 if test -f $xsrcdir$name/$implies_file; then
865 # Collect more names from the `Implies' file (removing comments).
866 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
867 for x in $implied_candidate; do
869 if test -d $xsrcdir$name_base/$x; then
870 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
875 test -n "$enable_debug_configure" &&
876 echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
877 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
879 eval "${implies_type}=\"\$${implies_type} \$try\""
882 if test $found = no; then
883 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
889 # Add NAME to the list of names.
892 # Find the parent of NAME, using the empty string if it has none.
894 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
897 test -n "$enable_debug_configure" &&
898 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
899 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
901 # Add the names implied by NAME, and NAME's parent (if it has one), to
902 # the list of names to be processed (the argument list). We prepend the
903 # implied names to the list and append the parent. We want implied
904 # directories to come before further directories inferred from the
905 # configuration components; this ensures that for sysv4, unix/common
906 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
908 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
909 test -n "$sysnames" && set $sysnames
912 # Add the default directories.
913 default_sysnames="sysdeps/generic"
914 sysnames="$names $default_sysnames"
916 # The other names were emitted during the scan.
917 AC_MSG_RESULT($default_sysnames)
923 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
924 # The makefiles need to use a different form to find it in $srcdir.
925 INSTALL='\$(..)./scripts/install-sh -c'
931 # Accept binutils 2.25 or newer.
932 AC_CHECK_PROG_VER(AS, $AS, --version,
933 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
934 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
935 AS=: critic_missing="$critic_missing as")
937 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
938 # Accept gold 1.14 or higher
939 AC_CHECK_PROG_VER(LD, $LD, --version,
940 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
941 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
942 LD=: critic_missing="$critic_missing GNU gold")
944 AC_CHECK_PROG_VER(LD, $LD, --version,
945 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
946 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
947 LD=: critic_missing="$critic_missing GNU ld")
950 # These programs are version sensitive.
952 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
953 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
954 [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
956 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
957 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
958 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
959 MSGFMT=: aux_missing="$aux_missing msgfmt")
960 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
961 [GNU texinfo.* \([0-9][0-9.]*\)],
962 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
963 MAKEINFO=: aux_missing="$aux_missing makeinfo")
964 AC_CHECK_PROG_VER(SED, sed, --version,
965 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
966 [3.0[2-9]*|3.[1-9]*|[4-9]*],
967 SED=: aux_missing="$aux_missing sed")
968 AC_CHECK_PROG_VER(AWK, gawk, --version,
969 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
970 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
971 AC_CHECK_PROG_VER(BISON, bison, --version,
972 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
973 [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
975 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
977 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
978 #error insufficient compiler
980 [libc_cv_compiler_ok=yes],
981 [libc_cv_compiler_ok=no])])
982 AS_IF([test $libc_cv_compiler_ok != yes],
983 [critic_missing="$critic_missing compiler"])
985 AC_CHECK_TOOL(NM, nm, false)
987 if test "x$maintainer" = "xyes"; then
988 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
990 xno|x|x:) AUTOCONF=no ;;
993 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
994 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
995 libc_cv_autoconf_works=yes
997 libc_cv_autoconf_works=no
999 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1002 if test "x$AUTOCONF" = xno; then
1003 aux_missing="$aux_missing autoconf"
1009 # Check for python3 if available, or else python.
1010 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1011 case "x$PYTHON_PROG" in
1012 xno|x|x:) PYTHON_PROG=no ;;
1016 if test "x$PYTHON_PROG" = xno; then
1017 aux_missing="$aux_missing python"
1019 PYTHON="$PYTHON_PROG -B"
1023 test -n "$critic_missing" && AC_MSG_ERROR([
1024 *** These critical programs are missing or too old:$critic_missing
1025 *** Check the INSTALL file for required versions.])
1027 test -n "$aux_missing" && AC_MSG_WARN([
1028 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1029 *** some features or tests will be disabled.
1030 *** Check the INSTALL file for required versions.])
1032 # if using special system headers, find out the compiler's sekrit
1033 # header directory and add that to the list. NOTE: Only does the right
1034 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1035 if test -n "$sysheaders"; then
1036 SYSINCLUDES=-nostdinc
1037 for d in include include-fixed; do
1038 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1039 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1041 SYSINCLUDES="$SYSINCLUDES \
1042 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1043 if test -n "$CXX"; then
1045 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1046 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1047 test "x$cxxheaders" != x &&
1048 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1052 AC_SUBST(SYSINCLUDES)
1053 AC_SUBST(CXX_SYSINCLUDES)
1055 # Obtain some C++ header file paths. This is used to make a local
1056 # copy of those headers in Makerules.
1057 if test -n "$CXX"; then
1058 find_cxx_header () {
1059 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1060 | sed -n "\,$1:,{s/:\$//;p}"
1062 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1063 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1064 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1066 AC_SUBST(CXX_CSTDLIB_HEADER)
1067 AC_SUBST(CXX_CMATH_HEADER)
1068 AC_SUBST(CXX_BITS_STD_ABS_H)
1070 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1071 # since this would lead to problems installing/building glibc.
1072 # LD_LIBRARY_PATH contains the current directory if one of the following
1074 # - one of the terminals (":" and ";") is the first or last sign
1075 # - two terminals occur directly after each other
1076 # - the path contains an element with a dot in it
1077 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1079 case ${LD_LIBRARY_PATH} in
1080 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1081 ld_library_path_setting="contains current directory"
1084 ld_library_path_setting="ok"
1088 AC_MSG_RESULT($ld_library_path_setting)
1089 if test "$ld_library_path_setting" != "ok"; then
1091 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1092 *** building glibc. Please change the environment variable
1093 *** and run configure again.])
1096 AC_PATH_PROG(BASH_SHELL, bash, no)
1098 AC_PATH_PROG(PERL, perl, no)
1099 if test "$PERL" != no &&
1100 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1103 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1104 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1106 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1107 cat > conftest.s <<EOF
1110 .set glibc_conftest_frobozz,foo
1111 .globl glibc_conftest_frobozz
1113 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1114 # (but it doesn't work), so we must do a linking check to be sure.
1115 cat > conftest1.c <<\EOF
1116 extern int glibc_conftest_frobozz;
1117 void _start() { glibc_conftest_frobozz = 1; }
1119 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1120 -nostartfiles -nostdlib $no_ssp \
1121 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1122 libc_cv_asm_set_directive=yes
1124 libc_cv_asm_set_directive=no
1127 if test $libc_cv_asm_set_directive = yes; then
1128 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1131 AC_CACHE_CHECK(linker support for protected data symbol,
1132 libc_cv_protected_data,
1133 [cat > conftest.c <<EOF
1134 int bar __attribute__ ((visibility ("protected"))) = 1;
1136 libc_cv_protected_data=no
1137 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1138 cat > conftest.c <<EOF
1140 int main (void) { return bar; }
1142 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1143 libc_cv_protected_data=yes
1148 AC_SUBST(libc_cv_protected_data)
1150 AC_CACHE_CHECK(linker support for INSERT in linker script,
1152 [cat > conftest.c <<EOF
1153 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1154 int test (void) { return bar; }
1156 cat > conftest.t <<EOF
1161 INSERT AFTER .rela.dyn;
1164 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1169 AC_SUBST(libc_cv_insert)
1171 AC_CACHE_CHECK(for broken __attribute__((alias())),
1172 libc_cv_broken_alias_attribute,
1173 [cat > conftest.c <<EOF
1174 extern int foo (int x) __asm ("xyzzy");
1175 int bar (int x) { return x; }
1176 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1178 extern __typeof (dfoo) dfoo __asm ("abccb");
1181 libc_cv_broken_alias_attribute=yes
1182 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1183 if grep 'xyzzy' conftest.s >/dev/null &&
1184 grep 'abccb' conftest.s >/dev/null; then
1185 libc_cv_broken_alias_attribute=no
1188 rm -f conftest.c conftest.s
1190 if test $libc_cv_broken_alias_attribute = yes; then
1191 AC_MSG_ERROR(working alias attribute support required)
1194 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1195 libc_cv_have_sdata_section,
1196 [echo "int i;" > conftest.c
1197 libc_cv_have_sdata_section=no
1198 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1199 | grep '\.sdata' >/dev/null; then
1200 libc_cv_have_sdata_section=yes
1202 rm -f conftest.c conftest.so
1204 if test $libc_cv_have_sdata_section = yes; then
1205 AC_DEFINE(HAVE_SDATA_SECTION)
1208 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1209 libc_cv_ctors_header, [dnl
1210 libc_cv_ctors_header=yes
1211 LIBC_TRY_LINK_STATIC([
1212 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1213 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1216 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1217 { gsub(/\@<:@ */, "@<:@") }
1218 $2 == ".ctors" || $2 == ".dtors" {
1219 size = strtonum("0x" $6)
1220 align = strtonum("0x" $NF)
1222 stub@<:@$2@:>@ = size == align * 2
1225 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1226 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1227 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1229 '], [libc_cv_ctors_header=no])
1231 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1234 if test $libc_cv_ctors_header = no; then
1235 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1238 AC_CACHE_CHECK(for libunwind-support in compiler,
1239 libc_cv_cc_with_libunwind, [
1240 cat > conftest.c <<EOF
1241 int main (void) { return 0; }
1243 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1244 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1245 libc_cv_cc_with_libunwind=yes
1247 libc_cv_cc_with_libunwind=no
1250 AC_SUBST(libc_cv_cc_with_libunwind)
1251 if test $libc_cv_cc_with_libunwind = yes; then
1252 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1256 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1257 libc_cv_as_noexecstack, [dnl
1258 cat > conftest.c <<EOF
1261 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1262 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1263 && grep .note.GNU-stack conftest.s >/dev/null \
1264 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1265 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1267 libc_cv_as_noexecstack=yes
1269 libc_cv_as_noexecstack=no
1272 if test $libc_cv_as_noexecstack = yes; then
1273 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1275 AC_SUBST(ASFLAGS_config)
1277 AC_CACHE_CHECK(for -z combreloc,
1278 libc_cv_z_combreloc, [dnl
1279 cat > conftest.c <<EOF
1280 extern int bar (int);
1282 int foo (void) { return bar (mumble); }
1284 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1285 -fPIC -shared $no_ssp -o conftest.so conftest.c
1286 -nostdlib -nostartfiles
1287 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1289 dnl The following test is a bit weak. We must use a tool which can test
1290 dnl cross-platform since the gcc used can be a cross compiler. Without
1291 dnl introducing new options this is not easily doable. Instead use a tool
1292 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1293 dnl look for a section named .rel.dyn or .rela.dyn.
1294 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1295 libc_cv_z_combreloc=yes
1297 libc_cv_z_combreloc=no
1300 libc_cv_z_combreloc=no
1303 if test "$libc_cv_z_combreloc" = yes; then
1304 AC_DEFINE(HAVE_Z_COMBRELOC)
1306 AC_SUBST(libc_cv_z_combreloc)
1308 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1309 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1310 AC_SUBST(libc_cv_z_execstack)
1312 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1313 [-Wl,--no-dynamic-linker],
1314 [libc_cv_no_dynamic_linker=yes],
1315 [libc_cv_no_dynamic_linker=no])
1316 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1318 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1319 LIBC_TRY_CC_OPTION([-static-pie],
1320 [libc_cv_static_pie=yes],
1321 [libc_cv_static_pie=no])
1323 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1325 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1326 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1329 AC_SUBST(libc_cv_fpie)
1331 AC_CACHE_CHECK(for --hash-style option,
1332 libc_cv_hashstyle, [dnl
1333 cat > conftest.c <<EOF
1334 int _start (void) { return 42; }
1336 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1337 -fPIC -shared -o conftest.so conftest.c
1338 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1340 libc_cv_hashstyle=yes
1342 libc_cv_hashstyle=no
1345 AC_SUBST(libc_cv_hashstyle)
1347 # The linker's default -shared behavior is good enough if it
1348 # does these things that our custom linker scripts ensure that
1349 # all allocated NOTE sections come first.
1350 if test "$use_default_link" = default; then
1351 AC_CACHE_CHECK([for sufficient default -shared layout],
1352 libc_cv_use_default_link, [dnl
1353 libc_cv_use_default_link=no
1354 cat > conftest.s <<\EOF
1355 .section .note.a,"a",%note
1360 .section .note.b,"a",%note
1366 if AC_TRY_COMMAND([dnl
1367 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1368 ac_try=`$READELF -S conftest.so | sed -n \
1370 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1376 libc_seen_a=no libc_seen_b=no
1378 while test $# -ge 2 -a "$1" = NOTE; do
1380 .note.a) libc_seen_a=yes ;;
1381 .note.b) libc_seen_b=yes ;;
1385 case "$libc_seen_a$libc_seen_b" in
1387 libc_cv_use_default_link=yes
1390 echo >&AS_MESSAGE_LOG_FD "\
1391 $libc_seen_a$libc_seen_b from:
1397 use_default_link=$libc_cv_use_default_link
1400 AC_CACHE_CHECK(for GLOB_DAT reloc,
1401 libc_cv_has_glob_dat, [dnl
1402 cat > conftest.c <<EOF
1404 int foo (void) { return mumble; }
1406 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1407 -fPIC -shared -o conftest.so conftest.c
1408 -nostdlib -nostartfiles $no_ssp
1409 1>&AS_MESSAGE_LOG_FD])
1411 dnl look for GLOB_DAT relocation.
1412 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1413 libc_cv_has_glob_dat=yes
1415 libc_cv_has_glob_dat=no
1418 libc_cv_has_glob_dat=no
1421 AC_SUBST(libc_cv_has_glob_dat)
1423 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1424 if libc_cv_output_format=`
1425 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1429 libc_cv_output_format=
1431 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1432 AC_SUBST(libc_cv_output_format)
1434 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1435 cat > conftest.c <<EOF
1438 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1439 conftest.c 1>&AS_MESSAGE_LOG_FD])
1441 libc_cv_fno_toplevel_reorder=yes
1443 libc_cv_fno_toplevel_reorder=no
1446 if test $libc_cv_fno_toplevel_reorder = yes; then
1447 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1449 fno_unit_at_a_time=-fno-unit-at-a-time
1451 AC_SUBST(fno_unit_at_a_time)
1453 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1455 cat > conftest.c <<EOF
1462 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1463 conftest.c 1>&AS_MESSAGE_LOG_FD])
1465 libc_cv_mtls_dialect_gnu2=yes
1467 libc_cv_mtls_dialect_gnu2=no
1470 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1471 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1473 AC_CACHE_CHECK(whether cc puts quotes around section names,
1474 libc_cv_have_section_quotes,
1475 [cat > conftest.c <<EOF
1476 static const int foo
1477 __attribute__ ((section ("bar"))) = 1;
1479 if ${CC-cc} -S conftest.c -o conftest.s; then
1480 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1481 libc_cv_have_section_quotes=yes
1483 libc_cv_have_section_quotes=no
1486 libc_cv_have_section_quotes=unknown
1488 rm -f conftest.{c,s}
1490 if test $libc_cv_have_section_quotes = yes; then
1491 AC_DEFINE(HAVE_SECTION_QUOTES)
1494 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1495 cat > conftest.c <<\EOF
1498 __builtin_memset (x, 0, 1000);
1502 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1504 libc_cv_gcc_builtin_memset=no
1506 libc_cv_gcc_builtin_memset=yes
1509 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1510 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1513 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1514 cat > conftest.c <<\EOF
1515 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1516 char *foo (const char *a, const char *b)
1518 return __builtin_strstr (a, b);
1522 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1524 libc_cv_gcc_builtin_redirection=yes
1526 libc_cv_gcc_builtin_redirection=no
1529 if test "$libc_cv_gcc_builtin_redirection" = no; then
1530 AC_MSG_ERROR([support for the symbol redirection needed])
1533 dnl Determine how to disable generation of FMA instructions.
1534 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1535 libc_cv_cc_nofma, [dnl
1537 for opt in -ffp-contract=off -mno-fused-madd; do
1538 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1540 AC_SUBST(libc_cv_cc_nofma)
1542 if test -n "$submachine"; then
1543 AC_CACHE_CHECK([for compiler option for CPU variant],
1544 libc_cv_cc_submachine, [dnl
1545 libc_cv_cc_submachine=no
1546 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1547 LIBC_TRY_CC_OPTION([$opt], [
1548 libc_cv_cc_submachine="$opt"
1551 if test "x$libc_cv_cc_submachine" = xno; then
1552 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1555 AC_SUBST(libc_cv_cc_submachine)
1557 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1558 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1559 cat > conftest.c <<EOF
1561 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1564 libc_cv_cc_loop_to_function=no
1565 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1567 libc_cv_cc_loop_to_function=yes
1570 if test $libc_cv_cc_loop_to_function = yes; then
1571 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1573 AC_SUBST(libc_cv_cc_loop_to_function)
1575 dnl Check whether we have the gd library available.
1576 AC_MSG_CHECKING(for libgd)
1577 if test "$with_gd" != "no"; then
1578 old_CFLAGS="$CFLAGS"
1579 CFLAGS="$CFLAGS $libgd_include"
1580 old_LDFLAGS="$LDFLAGS"
1581 LDFLAGS="$LDFLAGS $libgd_ldflags"
1583 LIBS="$LIBS -lgd -lpng -lz -lm"
1584 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1585 CFLAGS="$old_CFLAGS"
1586 LDFLAGS="$old_LDFLAGS"
1591 AC_MSG_RESULT($LIBGD)
1595 if test x$with_selinux = xno ; then
1598 # See if we have the SELinux library
1599 AC_CHECK_LIB(selinux, is_selinux_enabled,
1600 have_selinux=yes, have_selinux=no)
1601 if test x$with_selinux = xyes ; then
1602 if test x$have_selinux = xno ; then
1603 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1607 # Check if we're building with SELinux support.
1608 if test "x$have_selinux" = xyes; then
1609 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1611 # See if we have the libaudit library
1612 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1613 have_libaudit=yes, have_libaudit=no)
1614 if test "x$have_libaudit" = xyes; then
1615 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1617 AC_SUBST(have_libaudit)
1619 # See if we have the libcap library
1620 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1621 if test "x$have_libcap" = xyes; then
1622 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1624 AC_SUBST(have_libcap)
1626 AC_SUBST(have_selinux)
1629 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1630 dnl Since we are building the implementations of the fortified functions here,
1631 dnl having the macro defined interacts very badly.
1632 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1633 [AC_TRY_COMPILE([], [
1634 #ifdef _FORTIFY_SOURCE
1637 [libc_cv_predef_fortify_source=no],
1638 [libc_cv_predef_fortify_source=yes])])
1639 if test $libc_cv_predef_fortify_source = yes; then
1640 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1644 # Some linkers on some architectures support __ehdr_start but with
1645 # bugs. Make sure usage of it does not create relocations in the
1646 # output (as the linker should resolve them all for us).
1647 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1648 libc_cv_ehdr_start, [
1649 old_CFLAGS="$CFLAGS"
1650 old_LDFLAGS="$LDFLAGS"
1652 CFLAGS="$CFLAGS -fPIC"
1653 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1655 AC_LINK_IFELSE([AC_LANG_SOURCE([
1660 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1661 long ehdr (void) { return __ehdr_start.val; }
1663 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1664 libc_cv_ehdr_start=broken
1666 libc_cv_ehdr_start=yes
1667 fi], [libc_cv_ehdr_start=no])
1668 CFLAGS="$old_CFLAGS"
1669 LDFLAGS="$old_LDFLAGS"
1672 if test "$libc_cv_ehdr_start" = yes; then
1673 AC_DEFINE([HAVE_EHDR_START])
1674 elif test "$libc_cv_ehdr_start" = broken; then
1675 AC_MSG_WARN([linker is broken -- you should upgrade])
1678 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1679 libc_cv_builtin_trap, [dnl
1680 libc_cv_builtin_trap=no
1681 AC_TRY_COMPILE([], [__builtin_trap ()], [
1682 libc_undefs=`$NM -u conftest.o |
1683 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1684 2>&AS_MESSAGE_LOG_FD` || {
1685 AC_MSG_ERROR([confusing output from $NM -u])
1687 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1688 if test -z "$libc_undefs"; then
1689 libc_cv_builtin_trap=yes
1691 if test $libc_cv_builtin_trap = yes; then
1692 AC_DEFINE([HAVE_BUILTIN_TRAP])
1695 dnl C++ feature tests.
1698 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1699 libc_cv_cxx_thread_local, [
1700 old_CXXFLAGS="$CXXFLAGS"
1701 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1702 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1705 // Compiler support.
1712 S * get () { return &s; }
1714 // libstdc++ support.
1715 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1716 #error __cxa_thread_atexit_impl not supported
1719 [libc_cv_cxx_thread_local=yes],
1720 [libc_cv_cxx_thread_local=no])
1721 CXXFLAGS="$old_CXXFLAGS"
1723 AC_SUBST(libc_cv_cxx_thread_local)
1726 dnl End of C++ feature tests.
1728 ### End of automated tests.
1729 ### Now run sysdeps configure fragments.
1731 # They also can set these variables.
1733 ldd_rewrite_script=no
1734 libc_cv_sysconfdir=$sysconfdir
1735 libc_cv_localstatedir=$localstatedir
1736 libc_cv_gcc_unwind_find_fde=no
1739 # Iterate over all the sysdep directories we will use, running their
1740 # configure fragments.
1741 for dir in $sysnames; do
1744 *) dest=$srcdir/$dir ;;
1746 if test -r $dest/configure; then
1747 AC_MSG_RESULT(running configure fragment for $dir)
1752 if test x"$build_mathvec" = xnotset; then
1755 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1757 AC_SUBST(libc_extra_cflags)
1758 AC_SUBST(libc_extra_cppflags)
1760 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1761 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1763 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1765 # A sysdeps configure fragment can reset this if IFUNC is not actually
1766 # usable even though the assembler knows how to generate the symbol type.
1767 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1768 AC_DEFINE(HAVE_IFUNC)
1771 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1772 AC_DEFINE(HAVE_GCC_IFUNC)
1775 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1776 # configure fragment can override the value to prevent this AC_DEFINE.
1778 if test "x$use_nscd" != xno; then
1779 AC_DEFINE([USE_NSCD])
1781 if test "x$build_nscd" = xdefault; then
1782 build_nscd=$use_nscd
1785 AC_SUBST(libc_cv_slibdir)
1786 AC_SUBST(libc_cv_rtlddir)
1787 AC_SUBST(libc_cv_complocaledir)
1788 AC_SUBST(libc_cv_sysconfdir)
1789 AC_SUBST(libc_cv_localstatedir)
1790 AC_SUBST(libc_cv_rootsbindir)
1792 if test x$use_ldconfig = xyes; then
1793 AC_DEFINE(USE_LDCONFIG)
1795 AC_SUBST(use_ldconfig)
1796 AC_SUBST(ldd_rewrite_script)
1801 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1802 [libc_cv_pic_default=yes
1803 cat > conftest.c <<EOF
1804 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1805 # error PIC is default.
1808 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1809 libc_cv_pic_default=no
1812 AC_SUBST(libc_cv_pic_default)
1814 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1815 [libc_cv_cc_pie_default=yes
1816 cat > conftest.c <<EOF
1817 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1818 # error PIE is default.
1821 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1822 libc_cv_cc_pie_default=no
1825 libc_cv_pie_default=$libc_cv_cc_pie_default
1826 AC_SUBST(libc_cv_cc_pie_default)
1827 AC_SUBST(libc_cv_pie_default)
1829 # Set the `multidir' variable by grabbing the variable from the compiler.
1830 # We do it once and save the result in a generated makefile.
1831 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1832 AC_SUBST(libc_cv_multidir)
1834 if test "$static_pie" = yes; then
1835 # The linker must support --no-dynamic-linker.
1836 if test "$libc_cv_no_dynamic_linker" != yes; then
1837 AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1840 libc_cv_pie_default=yes
1841 AC_DEFINE(ENABLE_STATIC_PIE)
1843 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1846 AC_SUBST(static_nss)
1850 dnl See sysdeps/mach/configure.ac for this variable.
1851 AC_SUBST(mach_interface_list)
1853 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1854 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1858 AC_CONFIG_FILES([config.make Makefile])
1859 AC_CONFIG_COMMANDS([default],[[
1860 case $CONFIG_FILES in *config.make*)
1861 echo "$config_vars" >> config.make;;
1863 test -d bits || mkdir bits]],[[config_vars='$config_vars']])