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/],
4 [glibc], [https://www.gnu.org/software/glibc/])
5 AC_CONFIG_SRCDIR([include/features.h])
6 AC_CONFIG_HEADERS([config.h])
7 AC_CONFIG_AUX_DIR([scripts])
9 ACX_PKGVERSION([GNU libc])
10 ACX_BUGURL([https://www.gnu.org/software/libc/bugs.html])
11 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
12 [Package description])
13 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
14 [Bug reporting address])
16 # Glibc should not depend on any header files
17 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
18 [m4_divert_text([DEFAULTS],
19 [ac_includes_default='/* none */'])])
21 # We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
22 # here to work around the Autoconf issue discussed in
23 # <https://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
24 AC_DEFUN([AC_PROG_CPP],
25 [AC_REQUIRE([AC_PROG_CC])dnl
26 AC_ARG_VAR([CPP], [C preprocessor])dnl
27 _AC_ARG_VAR_CPPFLAGS()dnl
28 # On Suns, sometimes $CPP names a directory.
29 if test -n "$CPP" && test -d "$CPP"; then
32 if test -z "$CPP"; then
38 # We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf
40 # <https://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
41 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
43 dnl This is here so we can set $subdirs directly based on configure fragments.
49 if test $host != $build; then
50 AC_CHECK_PROGS(BUILD_CC, gcc cc)
52 AC_SUBST(cross_compiling)
54 AC_CHECK_TOOL(READELF, readelf, false)
56 # We need the C++ compiler only for testing.
58 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
59 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
61 # Default, dynamic case.
62 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
63 [libc_cv_cxx_link_ok=yes],
64 [libc_cv_cxx_link_ok=no])
66 old_LDFLAGS="$LDFLAGS"
67 LDFLAGS="$LDFLAGS -static"
68 AC_LINK_IFELSE([AC_LANG_SOURCE([
74 std::cout << "Hello, world!";
79 [libc_cv_cxx_link_ok=no])
80 LDFLAGS="$old_LDFLAGS"
82 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
84 if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
85 AC_MSG_ERROR([you must configure in a separate build directory])
88 # This will get text that should go into config.make.
91 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
93 AC_HELP_STRING([--with-gd=DIR],
94 [find libgd include dir and library with prefix DIR]),
98 *) libgd_include="-I$withval/include"
99 libgd_ldflags="-L$withval/lib" ;;
102 AC_ARG_WITH([gd-include],
103 AC_HELP_STRING([--with-gd-include=DIR],
104 [find libgd include files in DIR]),
106 case "$with_gd_include" in
108 *) libgd_include="-I$withval" ;;
111 AC_ARG_WITH([gd-lib],
112 AC_HELP_STRING([--with-gd-lib=DIR],
113 [find libgd library files in DIR]),
115 case "$with_gd_lib" in
117 *) libgd_ldflags="-L$withval" ;;
121 if test -n "$libgd_include"; then
122 config_vars="$config_vars
123 CFLAGS-memusagestat.c = $libgd_include"
125 if test -n "$libgd_ldflags"; then
126 config_vars="$config_vars
127 libgd-LDFLAGS = $libgd_ldflags"
130 dnl Arguments to specify presence of other packages/features.
131 AC_ARG_WITH([binutils],
132 AC_HELP_STRING([--with-binutils=PATH],
133 [specify location of binutils (as and ld)]),
134 [path_binutils=$withval],
136 AC_ARG_WITH([selinux],
137 AC_HELP_STRING([--with-selinux],
138 [if building with SELinux support]),
139 [with_selinux=$withval],
142 AC_ARG_WITH([headers],
143 AC_HELP_STRING([--with-headers=PATH],
144 [location of system headers to use
145 (for example /usr/src/linux/include)
146 @<:@default=compiler default@:>@]),
147 [sysheaders=$withval],
151 AC_SUBST(use_default_link)
152 AC_ARG_WITH([default-link],
153 AC_HELP_STRING([--with-default-link],
154 [do not use explicit linker scripts]),
155 [use_default_link=$withval],
156 [use_default_link=default])
158 dnl Additional build flags injection.
159 AC_ARG_WITH([nonshared-cflags],
160 AC_HELP_STRING([--with-nonshared-cflags=CFLAGS],
161 [build nonshared libraries with additional CFLAGS]),
162 [extra_nonshared_cflags=$withval],
163 [extra_nonshared_cflags=])
164 AC_SUBST(extra_nonshared_cflags)
166 AC_ARG_ENABLE([sanity-checks],
167 AC_HELP_STRING([--disable-sanity-checks],
168 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
169 [enable_sanity=$enableval],
172 AC_ARG_ENABLE([shared],
173 AC_HELP_STRING([--enable-shared],
174 [build shared library @<:@default=yes if GNU ld@:>@]),
177 AC_ARG_ENABLE([profile],
178 AC_HELP_STRING([--enable-profile],
179 [build profiled library @<:@default=no@:>@]),
180 [profile=$enableval],
182 AC_ARG_ENABLE([static-pie],
183 AC_HELP_STRING([--enable-static-pie],
184 [enable static PIE support and use it in the testsuite @<:@default=no@:>@]),
185 [static_pie=$enableval],
187 AC_ARG_ENABLE([timezone-tools],
188 AC_HELP_STRING([--disable-timezone-tools],
189 [do not install timezone tools @<:@default=install@:>@]),
190 [enable_timezone_tools=$enableval],
191 [enable_timezone_tools=yes])
192 AC_SUBST(enable_timezone_tools)
194 AC_ARG_ENABLE([hardcoded-path-in-tests],
195 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
196 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
197 [hardcoded_path_in_tests=$enableval],
198 [hardcoded_path_in_tests=no])
199 AC_SUBST(hardcoded_path_in_tests)
201 AC_ARG_ENABLE([stackguard-randomization],
202 AC_HELP_STRING([--enable-stackguard-randomization],
203 [initialize __stack_chk_guard canary with a random number at program start]),
204 [enable_stackguard_randomize=$enableval],
205 [enable_stackguard_randomize=no])
206 if test "$enable_stackguard_randomize" = yes; then
207 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
210 AC_ARG_ENABLE([hidden-plt],
211 AC_HELP_STRING([--disable-hidden-plt],
212 [do not hide internal function calls to avoid PLT]),
215 if test "x$hidden" = xno; then
219 AC_ARG_ENABLE([bind-now],
220 AC_HELP_STRING([--enable-bind-now],
221 [disable lazy relocations in DSOs]),
222 [bindnow=$enableval],
225 if test "x$bindnow" = xyes; then
229 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
230 dnl -fstack-protector-strong.
231 AC_ARG_ENABLE([stack-protector],
232 AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
233 [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
234 [enable_stack_protector=$enableval],
235 [enable_stack_protector=no])
236 case "$enable_stack_protector" in
237 all|yes|no|strong) ;;
238 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
241 dnl On some platforms we cannot use dynamic loading. We must provide
242 dnl static NSS modules.
243 AC_ARG_ENABLE([static-nss],
244 AC_HELP_STRING([--enable-static-nss],
245 [build static NSS modules @<:@default=no@:>@]),
246 [static_nss=$enableval],
248 dnl Enable static NSS also if we build no shared objects.
249 if test x"$static_nss" = xyes || test x"$shared" = xno; then
251 AC_DEFINE(DO_STATIC_NSS)
254 AC_ARG_ENABLE([force-install],
255 AC_HELP_STRING([--disable-force-install],
256 [don't force installation of files from this package, even if they are older than the installed files]),
257 [force_install=$enableval],
259 AC_SUBST(force_install)
261 AC_ARG_ENABLE([maintainer-mode],
262 AC_HELP_STRING([--enable-maintainer-mode],
263 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
264 [maintainer=$enableval],
267 dnl On some platforms we allow dropping compatibility with all kernel
269 AC_ARG_ENABLE([kernel],
270 AC_HELP_STRING([--enable-kernel=VERSION],
271 [compile for compatibility with kernel not older than VERSION]),
272 [minimum_kernel=$enableval],
274 dnl Prevent unreasonable values.
275 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
276 # Better nothing than this.
279 if test "$minimum_kernel" = current; then
280 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
284 dnl For the development we sometimes want gcc to issue even more warnings.
285 dnl This is not the default since many of the extra warnings are not
287 AC_ARG_ENABLE([all-warnings],
288 AC_HELP_STRING([--enable-all-warnings],
289 [enable all useful warnings gcc can issue]),
290 [all_warnings=$enableval],
292 AC_SUBST(all_warnings)
294 AC_ARG_ENABLE([werror],
295 AC_HELP_STRING([--disable-werror],
296 [do not build with -Werror]),
297 [enable_werror=$enableval],
299 AC_SUBST(enable_werror)
301 AC_ARG_ENABLE([multi-arch],
302 AC_HELP_STRING([--enable-multi-arch],
303 [enable single DSO with optimizations for multiple architectures]),
304 [multi_arch=$enableval],
305 [multi_arch=default])
307 AC_ARG_ENABLE([experimental-malloc],
308 AC_HELP_STRING([--disable-experimental-malloc],
309 [disable experimental malloc features]),
310 [experimental_malloc=$enableval],
311 [experimental_malloc=yes])
312 AC_SUBST(experimental_malloc)
314 AC_ARG_ENABLE([crypt],
315 AC_HELP_STRING([--disable-crypt],
316 [do not build nor install the passphrase hashing library, libcrypt]),
317 [build_crypt=$enableval],
319 AC_SUBST(build_crypt)
321 AC_ARG_ENABLE([nss-crypt],
322 AC_HELP_STRING([--enable-nss-crypt],
323 [enable libcrypt to use nss]),
324 [nss_crypt=$enableval],
326 if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
327 AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
330 if test x$nss_crypt = xyes; then
331 nss_includes=-I$(nss-config --includedir 2>/dev/null)
332 if test $? -ne 0; then
333 AC_MSG_ERROR([cannot find include directory with nss-config])
335 nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
336 if test $? -ne 0; then
337 AC_MSG_ERROR([cannot find include directory with nspr-config])
340 CFLAGS="$CFLAGS $nss_includes $nspr_includes"
341 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
343 #include <nsslowhash.h>
344 void f (void) { NSSLOW_Init (); }])],
345 libc_cv_nss_crypt=yes,
347 cannot find NSS headers with lowlevel hash function interfaces]))
349 old_LDFLAGS="$LDFLAGS"
350 LIBS="$LIBS -lfreebl3"
351 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
353 #include <nsslowhash.h>],
355 libc_cv_nss_crypt=yes,
357 cannot link program using lowlevel NSS hash functions]))
358 # Check to see if there is a static NSS cryptographic library.
359 # If there isn't then we can't link anything with libcrypt.a,
360 # and that might mean disabling some static tests.
361 LDFLAGS="$LDFLAGS -static"
362 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
364 #include <nsslowhash.h>],
366 libc_cv_static_nss_crypt=yes,
367 libc_cv_static_nss_crypt=no)
368 LDFLAGS="$old_LDFLAGS"
373 libc_cv_static_nss_crypt=no
375 AC_SUBST(libc_cv_nss_crypt)
376 AC_SUBST(libc_cv_static_nss_crypt)
379 AC_ARG_ENABLE([obsolete-rpc],
380 AC_HELP_STRING([--enable-obsolete-rpc],
381 [build and install the obsolete RPC code for link-time usage]),
382 [link_obsolete_rpc=$enableval],
383 [link_obsolete_rpc=no])
384 AC_SUBST(link_obsolete_rpc)
386 if test "$link_obsolete_rpc" = yes; then
387 AC_DEFINE(LINK_OBSOLETE_RPC)
390 AC_ARG_ENABLE([obsolete-nsl],
391 AC_HELP_STRING([--enable-obsolete-nsl],
392 [build and install the obsolete libnsl library and depending NSS modules]),
393 [build_obsolete_nsl=$enableval],
394 [build_obsolete_nsl=no])
395 AC_SUBST(build_obsolete_nsl)
397 if test "$build_obsolete_nsl" = yes; then
398 AC_DEFINE(LINK_OBSOLETE_NSL)
401 AC_ARG_ENABLE([systemtap],
402 [AS_HELP_STRING([--enable-systemtap],
403 [enable systemtap static probe points @<:@default=no@:>@])],
404 [systemtap=$enableval],
406 if test "x$systemtap" != xno; then
407 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
409 CFLAGS="-std=gnu11 $CFLAGS"
410 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
411 void foo (int i, void *p)
413 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
414 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
415 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
416 CFLAGS="$old_CFLAGS"])
417 if test $libc_cv_sdt = yes; then
418 AC_DEFINE([USE_STAP_PROBE])
419 elif test "x$systemtap" != xauto; then
420 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
424 AC_ARG_ENABLE([build-nscd],
425 [AS_HELP_STRING([--disable-build-nscd],
426 [disable building and installing the nscd daemon])],
427 [build_nscd=$enableval],
428 [build_nscd=default])
431 # Note the use of $use_nscd is near the bottom of the file.
432 AC_ARG_ENABLE([nscd],
433 [AS_HELP_STRING([--disable-nscd],
434 [library functions will not contact the nscd daemon])],
435 [use_nscd=$enableval],
438 AC_ARG_ENABLE([pt_chown],
439 [AS_HELP_STRING([--enable-pt_chown],
440 [Enable building and installing pt_chown])],
441 [build_pt_chown=$enableval],
443 AC_SUBST(build_pt_chown)
444 if test "$build_pt_chown" = yes; then
445 AC_DEFINE(HAVE_PT_CHOWN)
448 AC_ARG_ENABLE([tunables],
449 [AS_HELP_STRING([--enable-tunables],
450 [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
451 [have_tunables=$enableval],
453 AC_SUBST(have_tunables)
454 if test "$have_tunables" = yes; then
455 AC_DEFINE(HAVE_TUNABLES)
458 # The abi-tags file uses a fairly simplistic model for name recognition that
459 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
460 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
461 # This doesn't get used much beyond that, so it's fairly safe.
466 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
470 AC_ARG_ENABLE([mathvec],
471 [AS_HELP_STRING([--enable-mathvec],
472 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
473 [build_mathvec=$enableval],
474 [build_mathvec=notset])
478 # error no CET compiler support
480 [libc_cv_compiler_default_cet=yes],
481 [libc_cv_compiler_default_cet=no])
484 AC_HELP_STRING([--enable-cet],
485 [enable Intel Control-flow Enforcement Technology (CET), x86 only]),
486 [enable_cet=$enableval],
487 [enable_cet=$libc_cv_compiler_default_cet])
489 # We keep the original values in `$config_*' and never modify them, so we
490 # can write them unchanged into config.make. Everything else uses
491 # $machine, $vendor, and $os, and changes them whenever convenient.
492 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
494 # Don't allow vendor == "unknown"
495 test "$config_vendor" = unknown && config_vendor=
496 config_os="`echo $config_os | sed 's/^unknown-//'`"
498 # Some configurations imply other options.
501 # The configure fragment of a port can modify these to supplement
502 # or override the table in the case statement below. No fragment should
503 # ever change the config_* variables, however.
504 machine=$config_machine
505 vendor=$config_vendor
511 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
514 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
516 *) submachine="$withval" ;;
520 # An preconfigure script can set this when it wants to disable the sanity
524 # A preconfigure script for a system that may or may not use fpu
525 # sysdeps directories sets this to a preprocessor conditional for
526 # whether to use such directories.
529 dnl Let sysdeps/*/preconfigure act here.
530 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
534 ### By using the undocumented --enable-hacker-mode option for configure
535 ### one can skip this test to make the configuration not fail for unsupported
538 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
539 case "$machine-$host_os" in
544 *** The GNU C library is currently unavailable for this platform.
545 *** If you are interested in seeing glibc on this platform visit
546 *** the "How to submit a new port" in the wiki:
547 *** https://sourceware.org/glibc/wiki/#Development
548 *** and join the community!])
553 # Set base_machine if not set by a preconfigure fragment.
554 test -n "$base_machine" || base_machine=$machine
555 AC_SUBST(base_machine)
557 # Determine whether to use fpu or nofpu sysdeps directories.
558 AC_CACHE_CHECK([for use of fpu sysdeps directories],
559 libc_cv_with_fp, [dnl
560 cat > conftest.c <<EOF
564 # error "no hardware floating point"
568 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
569 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
573 AC_SUBST(libc_cv_with_fp)
575 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
576 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
581 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
582 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
583 [libc_cv_ssp_strong=yes],
584 [libc_cv_ssp_strong=no])
587 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
588 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
589 [libc_cv_ssp_all=yes],
590 [libc_cv_ssp_all=no])
595 if test "$libc_cv_ssp" = yes; then
596 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
597 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
600 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
601 stack_protector="-fstack-protector"
602 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
603 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
604 stack_protector="-fstack-protector-all"
605 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
606 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
607 stack_protector="-fstack-protector-strong"
608 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
610 stack_protector="-fno-stack-protector"
611 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
613 AC_SUBST(libc_cv_ssp)
614 AC_SUBST(stack_protector)
615 AC_SUBST(no_stack_protector)
617 if test -n "$stack_protector"; then
618 dnl Don't run configure tests with stack-protection on, to avoid problems with
620 no_ssp=-fno-stack-protector
624 if test "$enable_stack_protector" != no; then
625 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
629 # For the multi-arch option we need support in the assembler & linker.
630 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
631 libc_cv_ld_gnu_indirect_function, [dnl
632 cat > conftest.S <<EOF
633 .type foo,%gnu_indirect_function
646 libc_cv_ld_gnu_indirect_function=no
647 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
648 -nostartfiles -nostdlib $no_ssp \
649 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
650 # Do a link to see if the backend supports IFUNC relocs.
651 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
652 LC_ALL=C $READELF -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && {
653 libc_cv_ld_gnu_indirect_function=yes
658 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
659 AC_CACHE_CHECK([for gcc attribute ifunc support],
660 libc_cv_gcc_indirect_function, [dnl
661 cat > conftest.c <<EOF
662 extern int func (int);
663 int used_func (int a)
667 static void *resolver ()
671 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
673 libc_cv_gcc_indirect_function=no
674 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
675 2>&AS_MESSAGE_LOG_FD ; then
676 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
677 libc_cv_gcc_indirect_function=yes
682 # Check if linker supports textrel relocation with ifunc (used on elf/tests).
683 # Note that it relies on libc_cv_ld_gnu_indirect_function test above.
684 AC_CACHE_CHECK([whether the linker supports textrels along with ifunc],
685 libc_cv_textrel_ifunc, [dnl
686 cat > conftest.S <<EOF
687 .type foo,%gnu_indirect_function
708 libc_cv_textrel_ifunc=no
709 if test $libc_cv_ld_gnu_indirect_function = yes; then
710 if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp -pie -o conftest conftest.S); then
711 libc_cv_textrel_ifunc=yes
715 AC_SUBST(libc_cv_textrel_ifunc)
717 # Check if gcc warns about alias for function with incompatible types.
718 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
719 libc_cv_gcc_incompatible_alias, [dnl
720 cat > conftest.c <<EOF
721 int __redirect_foo (const void *s, int c);
723 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
724 __typeof (__redirect_foo) *foo_impl (void)
729 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
731 libc_cv_gcc_incompatible_alias=yes
732 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
733 libc_cv_gcc_incompatible_alias=no
737 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
738 if test x"$multi_arch" = xyes; then
739 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
744 if test x"$libc_cv_gcc_indirect_function" != xyes; then
745 # GCC 8+ emits a warning for alias with incompatible types and it might
746 # fail to build ifunc resolvers aliases to either weak or internal
747 # symbols. Disables multiarch build in this case.
748 if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
749 AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
750 if test x"$multi_arch" = xyes; then
751 AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
753 AC_MSG_WARN([Multi-arch is disabled.])
755 elif test x"$multi_arch" = xyes; then
756 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
757 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
761 if test x"$multi_arch" != xno; then
762 multi_arch_d=/multiarch
765 # Compute the list of sysdep directories for this configuration.
766 # This can take a while to compute.
767 sysdep_dir=$srcdir/sysdeps
768 AC_MSG_CHECKING(sysdep dirs)
769 dnl We need to use [ and ] for other purposes for a while now.
771 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
772 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
774 test "x$base_os" != x || case "$os" in
781 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
784 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
788 o=`echo $tail | sed 's/[0-9]*$//'`
789 if test $o != $tail; then
792 # For linux-gnu, try linux-gnu, then linux.
793 o=`echo $tail | sed 's/-.*$//'`
794 if test $o != $tail; then
798 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
801 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
807 # For sparc/sparc32, try sparc/sparc32 and then sparc.
809 tail=$machine${submachine:+/$submachine}
810 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
812 # Prepend the machine's FPU directory unless the architecture specific
813 # preconfigure disables it.
814 if test "$libc_cv_with_fp" = yes; then
819 # For each machine term, try it with and then without /multiarch.
820 for try_fpu in $maybe_fpu ''; do
821 for try_multi in $multi_arch_d ''; do
822 mach="$mach /$1$try_fpu$try_multi"
828 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
831 # Find what sysdep directories exist.
833 for b in $base ''; do
834 for m0 in $mach ''; do
835 for v in /$vendor ''; do
836 test "$v" = / && continue
837 for o in /$ostry ''; do
838 test "$o" = / && continue
839 for m in $mach ''; do
840 try_suffix="$m0$b$v$o$m"
841 if test -n "$try_suffix"; then
842 try_srcdir="${srcdir}/"
843 try="sysdeps$try_suffix"
844 test -n "$enable_debug_configure" &&
845 echo "$0 [DEBUG]: try $try" >&2
846 if test -d "$try_srcdir$try"; then
847 sysnames="$sysnames $try"
848 { test -n "$o" || test -n "$b"; } && os_used=t
849 { test -n "$m" || test -n "$m0"; } && machine_used=t
851 x*/$submachine) submachine_used=t ;;
861 # If the assembler supports gnu_indirect_function symbol type and the
862 # architecture supports multi-arch, we enable multi-arch by default.
867 test x"$multi_arch" = xdefault && multi_arch=no
870 if test x"$multi_arch" != xno; then
871 AC_DEFINE(USE_MULTIARCH)
875 if test -z "$os_used" && test "$os" != none; then
876 AC_MSG_ERROR(Operating system $os is not supported.)
878 if test -z "$machine_used" && test "$machine" != none; then
879 AC_MSG_ERROR(The $machine is not supported.)
881 if test -z "$submachine_used" && test -n "$submachine"; then
882 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
886 # We have now validated the configuration.
888 # Expand the list of system names into a full list of directories
889 # from each element's parent name and Implies file (if present).
892 while test $# -gt 0; do
896 case " $names " in *" $name "*)
897 # Already in the list.
901 # Report each name as we discover it, so there is no long pause in output.
902 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
904 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
908 *) xsrcdir=$srcdir/ ;;
910 test -n "$enable_debug_configure" &&
911 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
913 for implies_file in Implies Implies-before Implies-after; do
914 implies_type=`echo $implies_file | sed s/-/_/`
915 eval ${implies_type}=
916 if test -f $xsrcdir$name/$implies_file; then
917 # Collect more names from the `Implies' file (removing comments).
918 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
919 for x in $implied_candidate; do
921 if test -d $xsrcdir$name_base/$x; then
922 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
927 test -n "$enable_debug_configure" &&
928 echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
929 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
931 eval "${implies_type}=\"\$${implies_type} \$try\""
934 if test $found = no; then
935 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
941 # Add NAME to the list of names.
944 # Find the parent of NAME, using the empty string if it has none.
946 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
949 test -n "$enable_debug_configure" &&
950 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
951 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
953 # Add the names implied by NAME, and NAME's parent (if it has one), to
954 # the list of names to be processed (the argument list). We prepend the
955 # implied names to the list and append the parent. We want implied
956 # directories to come before further directories inferred from the
957 # configuration components; this ensures that for sysv4, unix/common
958 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
960 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
961 test -n "$sysnames" && set $sysnames
964 # Add the default directories.
965 default_sysnames="sysdeps/generic"
966 sysnames="$names $default_sysnames"
968 # The other names were emitted during the scan.
969 AC_MSG_RESULT($default_sysnames)
975 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
976 # The makefiles need to use a different form to find it in $srcdir.
977 INSTALL='\$(..)./scripts/install-sh -c'
983 # Accept binutils 2.25 or newer.
984 AC_CHECK_PROG_VER(AS, $AS, --version,
985 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
986 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
987 AS=: critic_missing="$critic_missing as")
989 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
990 # Accept gold 1.14 or higher
991 AC_CHECK_PROG_VER(LD, $LD, --version,
992 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
993 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
994 LD=: critic_missing="$critic_missing GNU gold")
996 AC_CHECK_PROG_VER(LD, $LD, --version,
997 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
998 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
999 LD=: critic_missing="$critic_missing GNU ld")
1002 # These programs are version sensitive.
1003 AC_CHECK_TOOL_PREFIX
1004 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1005 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1006 [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1008 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1009 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1010 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1011 MSGFMT=: aux_missing="$aux_missing msgfmt")
1012 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1013 [GNU texinfo.* \([0-9][0-9.]*\)],
1014 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1015 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1016 AC_CHECK_PROG_VER(SED, sed, --version,
1017 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1018 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1019 SED=: aux_missing="$aux_missing sed")
1020 AC_CHECK_PROG_VER(AWK, gawk, --version,
1021 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1022 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1023 AC_CHECK_PROG_VER(BISON, bison, --version,
1024 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1025 [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
1027 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1028 AC_TRY_COMPILE([], [
1029 #if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
1030 #error insufficient compiler
1032 [libc_cv_compiler_ok=yes],
1033 [libc_cv_compiler_ok=no])])
1034 AS_IF([test $libc_cv_compiler_ok != yes],
1035 [critic_missing="$critic_missing compiler"])
1037 AC_CHECK_TOOL(NM, nm, false)
1039 if test "x$maintainer" = "xyes"; then
1040 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1041 case "x$AUTOCONF" in
1042 xno|x|x:) AUTOCONF=no ;;
1045 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1046 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1047 libc_cv_autoconf_works=yes
1049 libc_cv_autoconf_works=no
1051 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1054 if test "x$AUTOCONF" = xno; then
1055 aux_missing="$aux_missing autoconf"
1061 # Check for python3 if available, or else python.
1062 AC_CHECK_PROG_VER(PYTHON_PROG, python3 python, --version,
1063 [Python \([0-9][0-9.]*\)],
1064 [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
1065 critic_missing="$critic_missing python")
1066 PYTHON="$PYTHON_PROG -B"
1069 test -n "$critic_missing" && AC_MSG_ERROR([
1070 *** These critical programs are missing or too old:$critic_missing
1071 *** Check the INSTALL file for required versions.])
1073 test -n "$aux_missing" && AC_MSG_WARN([
1074 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1075 *** some features or tests will be disabled.
1076 *** Check the INSTALL file for required versions.])
1078 # if using special system headers, find out the compiler's sekrit
1079 # header directory and add that to the list. NOTE: Only does the right
1080 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1081 if test -n "$sysheaders"; then
1082 SYSINCLUDES=-nostdinc
1083 for d in include include-fixed; do
1084 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1085 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1087 SYSINCLUDES="$SYSINCLUDES \
1088 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1089 if test -n "$CXX"; then
1091 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1092 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1093 test "x$cxxheaders" != x &&
1094 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1098 AC_SUBST(SYSINCLUDES)
1099 AC_SUBST(CXX_SYSINCLUDES)
1101 # Obtain some C++ header file paths. This is used to make a local
1102 # copy of those headers in Makerules.
1103 if test -n "$CXX"; then
1104 find_cxx_header () {
1105 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1106 | sed -n "\,$1:,{s/:\$//;p}"
1108 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1109 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1110 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1112 AC_SUBST(CXX_CSTDLIB_HEADER)
1113 AC_SUBST(CXX_CMATH_HEADER)
1114 AC_SUBST(CXX_BITS_STD_ABS_H)
1116 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1117 # since this would lead to problems installing/building glibc.
1118 # LD_LIBRARY_PATH contains the current directory if one of the following
1120 # - one of the terminals (":" and ";") is the first or last sign
1121 # - two terminals occur directly after each other
1122 # - the path contains an element with a dot in it
1123 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1125 case ${LD_LIBRARY_PATH} in
1126 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1127 ld_library_path_setting="contains current directory"
1130 ld_library_path_setting="ok"
1134 AC_MSG_RESULT($ld_library_path_setting)
1135 if test "$ld_library_path_setting" != "ok"; then
1137 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1138 *** building glibc. Please change the environment variable
1139 *** and run configure again.])
1142 AC_PATH_PROG(BASH_SHELL, bash, no)
1144 AC_PATH_PROG(PERL, perl, no)
1145 if test "$PERL" != no &&
1146 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1149 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1150 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1152 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1153 cat > conftest.s <<EOF
1156 .set glibc_conftest_frobozz,foo
1157 .globl glibc_conftest_frobozz
1159 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1160 # (but it doesn't work), so we must do a linking check to be sure.
1161 cat > conftest1.c <<\EOF
1162 extern int glibc_conftest_frobozz;
1163 void _start() { glibc_conftest_frobozz = 1; }
1165 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1166 -nostartfiles -nostdlib $no_ssp \
1167 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1168 libc_cv_asm_set_directive=yes
1170 libc_cv_asm_set_directive=no
1173 if test $libc_cv_asm_set_directive = yes; then
1174 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1177 AC_CACHE_CHECK(linker support for protected data symbol,
1178 libc_cv_protected_data,
1179 [cat > conftest.c <<EOF
1180 int bar __attribute__ ((visibility ("protected"))) = 1;
1182 libc_cv_protected_data=no
1183 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1184 cat > conftest.c <<EOF
1186 int main (void) { return bar; }
1188 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1189 libc_cv_protected_data=yes
1194 AC_SUBST(libc_cv_protected_data)
1196 AC_CACHE_CHECK(linker support for INSERT in linker script,
1198 [cat > conftest.c <<EOF
1199 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1200 int test (void) { return bar; }
1202 cat > conftest.t <<EOF
1207 INSERT AFTER .rela.dyn;
1210 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1215 AC_SUBST(libc_cv_insert)
1217 AC_CACHE_CHECK(for broken __attribute__((alias())),
1218 libc_cv_broken_alias_attribute,
1219 [cat > conftest.c <<EOF
1220 extern int foo (int x) __asm ("xyzzy");
1221 int bar (int x) { return x; }
1222 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1224 extern __typeof (dfoo) dfoo __asm ("abccb");
1227 libc_cv_broken_alias_attribute=yes
1228 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1229 if grep 'xyzzy' conftest.s >/dev/null &&
1230 grep 'abccb' conftest.s >/dev/null; then
1231 libc_cv_broken_alias_attribute=no
1234 rm -f conftest.c conftest.s
1236 if test $libc_cv_broken_alias_attribute = yes; then
1237 AC_MSG_ERROR(working alias attribute support required)
1240 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1241 libc_cv_have_sdata_section,
1242 [echo "int i;" > conftest.c
1243 libc_cv_have_sdata_section=no
1244 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1245 | grep '\.sdata' >/dev/null; then
1246 libc_cv_have_sdata_section=yes
1248 rm -f conftest.c conftest.so
1250 if test $libc_cv_have_sdata_section = yes; then
1251 AC_DEFINE(HAVE_SDATA_SECTION)
1254 AC_CACHE_CHECK(for libunwind-support in compiler,
1255 libc_cv_cc_with_libunwind, [
1256 cat > conftest.c <<EOF
1257 int main (void) { return 0; }
1259 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1260 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1261 libc_cv_cc_with_libunwind=yes
1263 libc_cv_cc_with_libunwind=no
1266 AC_SUBST(libc_cv_cc_with_libunwind)
1267 if test $libc_cv_cc_with_libunwind = yes; then
1268 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1272 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1273 libc_cv_as_noexecstack, [dnl
1274 cat > conftest.c <<EOF
1277 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1278 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1279 && grep .note.GNU-stack conftest.s >/dev/null \
1280 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1281 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1283 libc_cv_as_noexecstack=yes
1285 libc_cv_as_noexecstack=no
1288 if test $libc_cv_as_noexecstack = yes; then
1289 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1291 AC_SUBST(ASFLAGS_config)
1293 AC_CACHE_CHECK(for -z combreloc,
1294 libc_cv_z_combreloc, [dnl
1295 cat > conftest.c <<EOF
1296 extern int bar (int);
1298 int foo (void) { return bar (mumble); }
1300 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1301 -fPIC -shared $no_ssp -o conftest.so conftest.c
1302 -nostdlib -nostartfiles
1303 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1305 dnl The following test is a bit weak. We must use a tool which can test
1306 dnl cross-platform since the gcc used can be a cross compiler. Without
1307 dnl introducing new options this is not easily doable. Instead use a tool
1308 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1309 dnl look for a section named .rel.dyn or .rela.dyn.
1310 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1311 libc_cv_z_combreloc=yes
1313 libc_cv_z_combreloc=no
1316 libc_cv_z_combreloc=no
1319 if test "$libc_cv_z_combreloc" = yes; then
1320 AC_DEFINE(HAVE_Z_COMBRELOC)
1322 AC_SUBST(libc_cv_z_combreloc)
1324 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1325 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1326 AC_SUBST(libc_cv_z_execstack)
1328 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1329 [-Wl,--no-dynamic-linker],
1330 [libc_cv_no_dynamic_linker=yes],
1331 [libc_cv_no_dynamic_linker=no])
1332 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1334 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1335 LIBC_TRY_CC_OPTION([-static-pie],
1336 [libc_cv_static_pie=yes],
1337 [libc_cv_static_pie=no])
1339 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1341 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1342 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1345 AC_SUBST(libc_cv_fpie)
1347 AC_CACHE_CHECK(for --hash-style option,
1348 libc_cv_hashstyle, [dnl
1349 cat > conftest.c <<EOF
1350 int _start (void) { return 42; }
1352 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1353 -fPIC -shared -o conftest.so conftest.c
1354 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1356 libc_cv_hashstyle=yes
1358 libc_cv_hashstyle=no
1361 AC_SUBST(libc_cv_hashstyle)
1363 # The linker's default -shared behavior is good enough if it
1364 # does these things that our custom linker scripts ensure that
1365 # all allocated NOTE sections come first.
1366 if test "$use_default_link" = default; then
1367 AC_CACHE_CHECK([for sufficient default -shared layout],
1368 libc_cv_use_default_link, [dnl
1369 libc_cv_use_default_link=no
1370 cat > conftest.s <<\EOF
1371 .section .note.a,"a",%note
1376 .section .note.b,"a",%note
1382 if AC_TRY_COMMAND([dnl
1383 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1384 ac_try=`$READELF -S conftest.so | sed -n \
1386 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1392 libc_seen_a=no libc_seen_b=no
1394 while test $# -ge 2 -a "$1" = NOTE; do
1396 .note.a) libc_seen_a=yes ;;
1397 .note.b) libc_seen_b=yes ;;
1401 case "$libc_seen_a$libc_seen_b" in
1403 libc_cv_use_default_link=yes
1406 echo >&AS_MESSAGE_LOG_FD "\
1407 $libc_seen_a$libc_seen_b from:
1413 use_default_link=$libc_cv_use_default_link
1416 AC_CACHE_CHECK(for GLOB_DAT reloc,
1417 libc_cv_has_glob_dat, [dnl
1418 cat > conftest.c <<EOF
1420 int foo (void) { return mumble; }
1422 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1423 -fPIC -shared -o conftest.so conftest.c
1424 -nostdlib -nostartfiles $no_ssp
1425 1>&AS_MESSAGE_LOG_FD])
1427 dnl look for GLOB_DAT relocation.
1428 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1429 libc_cv_has_glob_dat=yes
1431 libc_cv_has_glob_dat=no
1434 libc_cv_has_glob_dat=no
1437 AC_SUBST(libc_cv_has_glob_dat)
1439 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1440 if libc_cv_output_format=`
1441 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1445 libc_cv_output_format=
1447 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1448 AC_SUBST(libc_cv_output_format)
1450 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1451 cat > conftest.c <<EOF
1454 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1455 conftest.c 1>&AS_MESSAGE_LOG_FD])
1457 libc_cv_fno_toplevel_reorder=yes
1459 libc_cv_fno_toplevel_reorder=no
1462 if test $libc_cv_fno_toplevel_reorder = yes; then
1463 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1465 fno_unit_at_a_time=-fno-unit-at-a-time
1467 AC_SUBST(fno_unit_at_a_time)
1469 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1471 cat > conftest.c <<EOF
1478 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1479 conftest.c 1>&AS_MESSAGE_LOG_FD])
1481 libc_cv_mtls_dialect_gnu2=yes
1483 libc_cv_mtls_dialect_gnu2=no
1486 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1487 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1489 AC_CACHE_CHECK(whether cc puts quotes around section names,
1490 libc_cv_have_section_quotes,
1491 [cat > conftest.c <<EOF
1492 static const int foo
1493 __attribute__ ((section ("bar"))) = 1;
1495 if ${CC-cc} -S conftest.c -o conftest.s; then
1496 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1497 libc_cv_have_section_quotes=yes
1499 libc_cv_have_section_quotes=no
1502 libc_cv_have_section_quotes=unknown
1504 rm -f conftest.{c,s}
1506 if test $libc_cv_have_section_quotes = yes; then
1507 AC_DEFINE(HAVE_SECTION_QUOTES)
1510 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1511 cat > conftest.c <<\EOF
1514 __builtin_memset (x, 0, 1000);
1518 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1520 libc_cv_gcc_builtin_memset=no
1522 libc_cv_gcc_builtin_memset=yes
1525 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1526 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1529 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1530 cat > conftest.c <<\EOF
1531 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1532 char *foo (const char *a, const char *b)
1534 return __builtin_strstr (a, b);
1538 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1540 libc_cv_gcc_builtin_redirection=yes
1542 libc_cv_gcc_builtin_redirection=no
1545 if test "$libc_cv_gcc_builtin_redirection" = no; then
1546 AC_MSG_ERROR([support for the symbol redirection needed])
1549 dnl Determine how to disable generation of FMA instructions.
1550 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1551 libc_cv_cc_nofma, [dnl
1553 for opt in -ffp-contract=off -mno-fused-madd; do
1554 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1556 AC_SUBST(libc_cv_cc_nofma)
1558 if test -n "$submachine"; then
1559 AC_CACHE_CHECK([for compiler option for CPU variant],
1560 libc_cv_cc_submachine, [dnl
1561 libc_cv_cc_submachine=no
1562 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1563 LIBC_TRY_CC_OPTION([$opt], [
1564 libc_cv_cc_submachine="$opt"
1567 if test "x$libc_cv_cc_submachine" = xno; then
1568 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1571 AC_SUBST(libc_cv_cc_submachine)
1573 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1574 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1575 cat > conftest.c <<EOF
1577 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1580 libc_cv_cc_loop_to_function=no
1581 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1583 libc_cv_cc_loop_to_function=yes
1586 if test $libc_cv_cc_loop_to_function = yes; then
1587 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1589 AC_SUBST(libc_cv_cc_loop_to_function)
1591 dnl Check whether we have the gd library available.
1592 AC_MSG_CHECKING(for libgd)
1593 if test "$with_gd" != "no"; then
1594 old_CFLAGS="$CFLAGS"
1595 CFLAGS="$CFLAGS $libgd_include"
1596 old_LDFLAGS="$LDFLAGS"
1597 LDFLAGS="$LDFLAGS $libgd_ldflags"
1599 LIBS="$LIBS -lgd -lpng -lz -lm"
1600 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1601 CFLAGS="$old_CFLAGS"
1602 LDFLAGS="$old_LDFLAGS"
1607 AC_MSG_RESULT($LIBGD)
1611 if test x$with_selinux = xno ; then
1614 # See if we have the SELinux library
1615 AC_CHECK_LIB(selinux, is_selinux_enabled,
1616 have_selinux=yes, have_selinux=no)
1617 if test x$with_selinux = xyes ; then
1618 if test x$have_selinux = xno ; then
1619 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1623 # Check if we're building with SELinux support.
1624 if test "x$have_selinux" = xyes; then
1625 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1627 # See if we have the libaudit library
1628 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1629 have_libaudit=yes, have_libaudit=no)
1630 if test "x$have_libaudit" = xyes; then
1631 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1633 AC_SUBST(have_libaudit)
1635 # See if we have the libcap library
1636 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1637 if test "x$have_libcap" = xyes; then
1638 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1640 AC_SUBST(have_libcap)
1642 AC_SUBST(have_selinux)
1645 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1646 dnl Since we are building the implementations of the fortified functions here,
1647 dnl having the macro defined interacts very badly.
1648 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1649 [AC_TRY_COMPILE([], [
1650 #ifdef _FORTIFY_SOURCE
1653 [libc_cv_predef_fortify_source=no],
1654 [libc_cv_predef_fortify_source=yes])])
1655 if test $libc_cv_predef_fortify_source = yes; then
1656 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1660 # Some linkers on some architectures support __ehdr_start but with
1661 # bugs. Make sure usage of it does not create relocations in the
1662 # output (as the linker should resolve them all for us).
1663 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1664 libc_cv_ehdr_start, [
1665 old_CFLAGS="$CFLAGS"
1666 old_LDFLAGS="$LDFLAGS"
1668 CFLAGS="$CFLAGS -fPIC"
1669 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1671 AC_LINK_IFELSE([AC_LANG_SOURCE([
1676 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1677 long ehdr (void) { return __ehdr_start.val; }
1679 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1680 libc_cv_ehdr_start=broken
1682 libc_cv_ehdr_start=yes
1683 fi], [libc_cv_ehdr_start=no])
1684 CFLAGS="$old_CFLAGS"
1685 LDFLAGS="$old_LDFLAGS"
1688 if test "$libc_cv_ehdr_start" = yes; then
1689 AC_DEFINE([HAVE_EHDR_START])
1690 elif test "$libc_cv_ehdr_start" = broken; then
1691 AC_MSG_WARN([linker is broken -- you should upgrade])
1694 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1695 libc_cv_builtin_trap, [dnl
1696 libc_cv_builtin_trap=no
1697 AC_TRY_COMPILE([], [__builtin_trap ()], [
1698 libc_undefs=`$NM -u conftest.o |
1699 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1700 2>&AS_MESSAGE_LOG_FD` || {
1701 AC_MSG_ERROR([confusing output from $NM -u])
1703 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1704 if test -z "$libc_undefs"; then
1705 libc_cv_builtin_trap=yes
1707 if test $libc_cv_builtin_trap = yes; then
1708 AC_DEFINE([HAVE_BUILTIN_TRAP])
1711 dnl C++ feature tests.
1714 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1715 libc_cv_cxx_thread_local, [
1716 old_CXXFLAGS="$CXXFLAGS"
1717 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1718 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1721 // Compiler support.
1728 S * get () { return &s; }
1730 // libstdc++ support.
1731 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1732 #error __cxa_thread_atexit_impl not supported
1735 [libc_cv_cxx_thread_local=yes],
1736 [libc_cv_cxx_thread_local=no])
1737 CXXFLAGS="$old_CXXFLAGS"
1739 AC_SUBST(libc_cv_cxx_thread_local)
1742 dnl End of C++ feature tests.
1744 ### End of automated tests.
1745 ### Now run sysdeps configure fragments.
1747 # They also can set these variables.
1749 ldd_rewrite_script=no
1750 libc_cv_sysconfdir=$sysconfdir
1751 libc_cv_localstatedir=$localstatedir
1752 libc_cv_gcc_unwind_find_fde=no
1755 # Iterate over all the sysdep directories we will use, running their
1756 # configure fragments.
1757 for dir in $sysnames; do
1760 *) dest=$srcdir/$dir ;;
1762 if test -r $dest/configure; then
1763 AC_MSG_RESULT(running configure fragment for $dir)
1768 if test x"$build_mathvec" = xnotset; then
1771 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1773 AC_SUBST(libc_extra_cflags)
1774 AC_SUBST(libc_extra_cppflags)
1776 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1777 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1779 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1781 # A sysdeps configure fragment can reset this if IFUNC is not actually
1782 # usable even though the assembler knows how to generate the symbol type.
1783 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1784 AC_DEFINE(HAVE_IFUNC)
1786 LIBC_CONFIG_VAR([have-ifunc], [$libc_cv_ld_gnu_indirect_function])
1788 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1789 AC_DEFINE(HAVE_GCC_IFUNC)
1792 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1793 # configure fragment can override the value to prevent this AC_DEFINE.
1795 if test "x$use_nscd" != xno; then
1796 AC_DEFINE([USE_NSCD])
1798 if test "x$build_nscd" = xdefault; then
1799 build_nscd=$use_nscd
1802 AC_SUBST(libc_cv_slibdir)
1803 AC_SUBST(libc_cv_rtlddir)
1804 AC_SUBST(libc_cv_complocaledir)
1805 AC_SUBST(libc_cv_sysconfdir)
1806 AC_SUBST(libc_cv_localstatedir)
1807 AC_SUBST(libc_cv_rootsbindir)
1809 if test x$use_ldconfig = xyes; then
1810 AC_DEFINE(USE_LDCONFIG)
1812 AC_SUBST(use_ldconfig)
1813 AC_SUBST(ldd_rewrite_script)
1818 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1819 [libc_cv_pic_default=yes
1820 cat > conftest.c <<EOF
1821 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1822 # error PIC is default.
1825 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1826 libc_cv_pic_default=no
1829 AC_SUBST(libc_cv_pic_default)
1831 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1832 [libc_cv_cc_pie_default=yes
1833 cat > conftest.c <<EOF
1834 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1835 # error PIE is default.
1838 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1839 libc_cv_cc_pie_default=no
1842 libc_cv_pie_default=$libc_cv_cc_pie_default
1843 AC_SUBST(libc_cv_cc_pie_default)
1844 AC_SUBST(libc_cv_pie_default)
1846 # Set the `multidir' variable by grabbing the variable from the compiler.
1847 # We do it once and save the result in a generated makefile.
1848 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1849 AC_SUBST(libc_cv_multidir)
1851 if test "$static_pie" = yes; then
1852 # The linker must support --no-dynamic-linker.
1853 if test "$libc_cv_no_dynamic_linker" != yes; then
1854 AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1857 libc_cv_pie_default=yes
1858 AC_DEFINE(ENABLE_STATIC_PIE)
1860 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1863 AC_SUBST(static_nss)
1867 dnl See sysdeps/mach/configure.ac for this variable.
1868 AC_SUBST(mach_interface_list)
1870 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1871 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1875 AC_CONFIG_FILES([config.make Makefile])
1876 AC_CONFIG_COMMANDS([default],[[
1877 case $CONFIG_FILES in *config.make*)
1878 echo "$config_vars" >> config.make;;
1880 test -d bits || mkdir bits]],[[config_vars='$config_vars']])