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 -r conftest | grep 'no relocations' >/dev/null || {
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 --without-fp.
813 if test "$libc_cv_with_fp" = yes; then
818 # For each machine term, try it with and then without /multiarch.
819 for try_fpu in $maybe_fpu ''; do
820 for try_multi in $multi_arch_d ''; do
821 mach="$mach /$1$try_fpu$try_multi"
827 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
830 # Find what sysdep directories exist.
832 for b in $base ''; do
833 for m0 in $mach ''; do
834 for v in /$vendor ''; do
835 test "$v" = / && continue
836 for o in /$ostry ''; do
837 test "$o" = / && continue
838 for m in $mach ''; do
839 try_suffix="$m0$b$v$o$m"
840 if test -n "$try_suffix"; then
841 try_srcdir="${srcdir}/"
842 try="sysdeps$try_suffix"
843 test -n "$enable_debug_configure" &&
844 echo "$0 [DEBUG]: try $try" >&2
845 if test -d "$try_srcdir$try"; then
846 sysnames="$sysnames $try"
847 { test -n "$o" || test -n "$b"; } && os_used=t
848 { test -n "$m" || test -n "$m0"; } && machine_used=t
850 x*/$submachine) submachine_used=t ;;
860 # If the assembler supports gnu_indirect_function symbol type and the
861 # architecture supports multi-arch, we enable multi-arch by default.
866 test x"$multi_arch" = xdefault && multi_arch=no
869 if test x"$multi_arch" != xno; then
870 AC_DEFINE(USE_MULTIARCH)
874 if test -z "$os_used" && test "$os" != none; then
875 AC_MSG_ERROR(Operating system $os is not supported.)
877 if test -z "$machine_used" && test "$machine" != none; then
878 AC_MSG_ERROR(The $machine is not supported.)
880 if test -z "$submachine_used" && test -n "$submachine"; then
881 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
885 # We have now validated the configuration.
887 # Expand the list of system names into a full list of directories
888 # from each element's parent name and Implies file (if present).
891 while test $# -gt 0; do
895 case " $names " in *" $name "*)
896 # Already in the list.
900 # Report each name as we discover it, so there is no long pause in output.
901 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
903 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
907 *) xsrcdir=$srcdir/ ;;
909 test -n "$enable_debug_configure" &&
910 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
912 for implies_file in Implies Implies-before Implies-after; do
913 implies_type=`echo $implies_file | sed s/-/_/`
914 eval ${implies_type}=
915 if test -f $xsrcdir$name/$implies_file; then
916 # Collect more names from the `Implies' file (removing comments).
917 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
918 for x in $implied_candidate; do
920 if test -d $xsrcdir$name_base/$x; then
921 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
926 test -n "$enable_debug_configure" &&
927 echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
928 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
930 eval "${implies_type}=\"\$${implies_type} \$try\""
933 if test $found = no; then
934 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
940 # Add NAME to the list of names.
943 # Find the parent of NAME, using the empty string if it has none.
945 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
948 test -n "$enable_debug_configure" &&
949 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
950 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
952 # Add the names implied by NAME, and NAME's parent (if it has one), to
953 # the list of names to be processed (the argument list). We prepend the
954 # implied names to the list and append the parent. We want implied
955 # directories to come before further directories inferred from the
956 # configuration components; this ensures that for sysv4, unix/common
957 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
959 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
960 test -n "$sysnames" && set $sysnames
963 # Add the default directories.
964 default_sysnames="sysdeps/generic"
965 sysnames="$names $default_sysnames"
967 # The other names were emitted during the scan.
968 AC_MSG_RESULT($default_sysnames)
974 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
975 # The makefiles need to use a different form to find it in $srcdir.
976 INSTALL='\$(..)./scripts/install-sh -c'
982 # Accept binutils 2.25 or newer.
983 AC_CHECK_PROG_VER(AS, $AS, --version,
984 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
985 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
986 AS=: critic_missing="$critic_missing as")
988 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
989 # Accept gold 1.14 or higher
990 AC_CHECK_PROG_VER(LD, $LD, --version,
991 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
992 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
993 LD=: critic_missing="$critic_missing GNU gold")
995 AC_CHECK_PROG_VER(LD, $LD, --version,
996 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
997 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
998 LD=: critic_missing="$critic_missing GNU ld")
1001 # These programs are version sensitive.
1002 AC_CHECK_TOOL_PREFIX
1003 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1004 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1005 [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1007 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1008 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1009 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1010 MSGFMT=: aux_missing="$aux_missing msgfmt")
1011 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1012 [GNU texinfo.* \([0-9][0-9.]*\)],
1013 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1014 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1015 AC_CHECK_PROG_VER(SED, sed, --version,
1016 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1017 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1018 SED=: aux_missing="$aux_missing sed")
1019 AC_CHECK_PROG_VER(AWK, gawk, --version,
1020 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1021 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1022 AC_CHECK_PROG_VER(BISON, bison, --version,
1023 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1024 [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
1026 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1027 AC_TRY_COMPILE([], [
1028 #if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
1029 #error insufficient compiler
1031 [libc_cv_compiler_ok=yes],
1032 [libc_cv_compiler_ok=no])])
1033 AS_IF([test $libc_cv_compiler_ok != yes],
1034 [critic_missing="$critic_missing compiler"])
1036 AC_CHECK_TOOL(NM, nm, false)
1038 if test "x$maintainer" = "xyes"; then
1039 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1040 case "x$AUTOCONF" in
1041 xno|x|x:) AUTOCONF=no ;;
1044 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1045 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1046 libc_cv_autoconf_works=yes
1048 libc_cv_autoconf_works=no
1050 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1053 if test "x$AUTOCONF" = xno; then
1054 aux_missing="$aux_missing autoconf"
1060 # Check for python3 if available, or else python.
1061 AC_CHECK_PROG_VER(PYTHON_PROG, python3 python, --version,
1062 [Python \([0-9][0-9.]*\)],
1063 [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
1064 critic_missing="$critic_missing python")
1065 PYTHON="$PYTHON_PROG -B"
1068 test -n "$critic_missing" && AC_MSG_ERROR([
1069 *** These critical programs are missing or too old:$critic_missing
1070 *** Check the INSTALL file for required versions.])
1072 test -n "$aux_missing" && AC_MSG_WARN([
1073 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1074 *** some features or tests will be disabled.
1075 *** Check the INSTALL file for required versions.])
1077 # if using special system headers, find out the compiler's sekrit
1078 # header directory and add that to the list. NOTE: Only does the right
1079 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1080 if test -n "$sysheaders"; then
1081 SYSINCLUDES=-nostdinc
1082 for d in include include-fixed; do
1083 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1084 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1086 SYSINCLUDES="$SYSINCLUDES \
1087 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1088 if test -n "$CXX"; then
1090 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1091 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1092 test "x$cxxheaders" != x &&
1093 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1097 AC_SUBST(SYSINCLUDES)
1098 AC_SUBST(CXX_SYSINCLUDES)
1100 # Obtain some C++ header file paths. This is used to make a local
1101 # copy of those headers in Makerules.
1102 if test -n "$CXX"; then
1103 find_cxx_header () {
1104 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1105 | sed -n "\,$1:,{s/:\$//;p}"
1107 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1108 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1109 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1111 AC_SUBST(CXX_CSTDLIB_HEADER)
1112 AC_SUBST(CXX_CMATH_HEADER)
1113 AC_SUBST(CXX_BITS_STD_ABS_H)
1115 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1116 # since this would lead to problems installing/building glibc.
1117 # LD_LIBRARY_PATH contains the current directory if one of the following
1119 # - one of the terminals (":" and ";") is the first or last sign
1120 # - two terminals occur directly after each other
1121 # - the path contains an element with a dot in it
1122 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1124 case ${LD_LIBRARY_PATH} in
1125 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1126 ld_library_path_setting="contains current directory"
1129 ld_library_path_setting="ok"
1133 AC_MSG_RESULT($ld_library_path_setting)
1134 if test "$ld_library_path_setting" != "ok"; then
1136 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1137 *** building glibc. Please change the environment variable
1138 *** and run configure again.])
1141 AC_PATH_PROG(BASH_SHELL, bash, no)
1143 AC_PATH_PROG(PERL, perl, no)
1144 if test "$PERL" != no &&
1145 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1148 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1149 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1151 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1152 cat > conftest.s <<EOF
1155 .set glibc_conftest_frobozz,foo
1156 .globl glibc_conftest_frobozz
1158 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1159 # (but it doesn't work), so we must do a linking check to be sure.
1160 cat > conftest1.c <<\EOF
1161 extern int glibc_conftest_frobozz;
1162 void _start() { glibc_conftest_frobozz = 1; }
1164 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1165 -nostartfiles -nostdlib $no_ssp \
1166 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1167 libc_cv_asm_set_directive=yes
1169 libc_cv_asm_set_directive=no
1172 if test $libc_cv_asm_set_directive = yes; then
1173 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1176 AC_CACHE_CHECK(linker support for protected data symbol,
1177 libc_cv_protected_data,
1178 [cat > conftest.c <<EOF
1179 int bar __attribute__ ((visibility ("protected"))) = 1;
1181 libc_cv_protected_data=no
1182 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1183 cat > conftest.c <<EOF
1185 int main (void) { return bar; }
1187 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1188 libc_cv_protected_data=yes
1193 AC_SUBST(libc_cv_protected_data)
1195 AC_CACHE_CHECK(linker support for INSERT in linker script,
1197 [cat > conftest.c <<EOF
1198 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1199 int test (void) { return bar; }
1201 cat > conftest.t <<EOF
1206 INSERT AFTER .rela.dyn;
1209 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1214 AC_SUBST(libc_cv_insert)
1216 AC_CACHE_CHECK(for broken __attribute__((alias())),
1217 libc_cv_broken_alias_attribute,
1218 [cat > conftest.c <<EOF
1219 extern int foo (int x) __asm ("xyzzy");
1220 int bar (int x) { return x; }
1221 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1223 extern __typeof (dfoo) dfoo __asm ("abccb");
1226 libc_cv_broken_alias_attribute=yes
1227 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1228 if grep 'xyzzy' conftest.s >/dev/null &&
1229 grep 'abccb' conftest.s >/dev/null; then
1230 libc_cv_broken_alias_attribute=no
1233 rm -f conftest.c conftest.s
1235 if test $libc_cv_broken_alias_attribute = yes; then
1236 AC_MSG_ERROR(working alias attribute support required)
1239 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1240 libc_cv_have_sdata_section,
1241 [echo "int i;" > conftest.c
1242 libc_cv_have_sdata_section=no
1243 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1244 | grep '\.sdata' >/dev/null; then
1245 libc_cv_have_sdata_section=yes
1247 rm -f conftest.c conftest.so
1249 if test $libc_cv_have_sdata_section = yes; then
1250 AC_DEFINE(HAVE_SDATA_SECTION)
1253 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1254 libc_cv_ctors_header, [dnl
1255 libc_cv_ctors_header=yes
1256 LIBC_TRY_LINK_STATIC([
1257 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1258 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1261 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1262 { gsub(/\@<:@ */, "@<:@") }
1263 $2 == ".ctors" || $2 == ".dtors" {
1264 size = strtonum("0x" $6)
1265 align = strtonum("0x" $NF)
1267 stub@<:@$2@:>@ = size == align * 2
1270 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1271 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1272 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1274 '], [libc_cv_ctors_header=no])
1276 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1279 if test $libc_cv_ctors_header = no; then
1280 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1283 AC_CACHE_CHECK(for libunwind-support in compiler,
1284 libc_cv_cc_with_libunwind, [
1285 cat > conftest.c <<EOF
1286 int main (void) { return 0; }
1288 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1289 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1290 libc_cv_cc_with_libunwind=yes
1292 libc_cv_cc_with_libunwind=no
1295 AC_SUBST(libc_cv_cc_with_libunwind)
1296 if test $libc_cv_cc_with_libunwind = yes; then
1297 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1301 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1302 libc_cv_as_noexecstack, [dnl
1303 cat > conftest.c <<EOF
1306 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1307 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1308 && grep .note.GNU-stack conftest.s >/dev/null \
1309 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1310 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1312 libc_cv_as_noexecstack=yes
1314 libc_cv_as_noexecstack=no
1317 if test $libc_cv_as_noexecstack = yes; then
1318 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1320 AC_SUBST(ASFLAGS_config)
1322 AC_CACHE_CHECK(for -z combreloc,
1323 libc_cv_z_combreloc, [dnl
1324 cat > conftest.c <<EOF
1325 extern int bar (int);
1327 int foo (void) { return bar (mumble); }
1329 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1330 -fPIC -shared $no_ssp -o conftest.so conftest.c
1331 -nostdlib -nostartfiles
1332 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1334 dnl The following test is a bit weak. We must use a tool which can test
1335 dnl cross-platform since the gcc used can be a cross compiler. Without
1336 dnl introducing new options this is not easily doable. Instead use a tool
1337 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1338 dnl look for a section named .rel.dyn or .rela.dyn.
1339 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1340 libc_cv_z_combreloc=yes
1342 libc_cv_z_combreloc=no
1345 libc_cv_z_combreloc=no
1348 if test "$libc_cv_z_combreloc" = yes; then
1349 AC_DEFINE(HAVE_Z_COMBRELOC)
1351 AC_SUBST(libc_cv_z_combreloc)
1353 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1354 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1355 AC_SUBST(libc_cv_z_execstack)
1357 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1358 [-Wl,--no-dynamic-linker],
1359 [libc_cv_no_dynamic_linker=yes],
1360 [libc_cv_no_dynamic_linker=no])
1361 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1363 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1364 LIBC_TRY_CC_OPTION([-static-pie],
1365 [libc_cv_static_pie=yes],
1366 [libc_cv_static_pie=no])
1368 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1370 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1371 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1374 AC_SUBST(libc_cv_fpie)
1376 AC_CACHE_CHECK(for --hash-style option,
1377 libc_cv_hashstyle, [dnl
1378 cat > conftest.c <<EOF
1379 int _start (void) { return 42; }
1381 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1382 -fPIC -shared -o conftest.so conftest.c
1383 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1385 libc_cv_hashstyle=yes
1387 libc_cv_hashstyle=no
1390 AC_SUBST(libc_cv_hashstyle)
1392 # The linker's default -shared behavior is good enough if it
1393 # does these things that our custom linker scripts ensure that
1394 # all allocated NOTE sections come first.
1395 if test "$use_default_link" = default; then
1396 AC_CACHE_CHECK([for sufficient default -shared layout],
1397 libc_cv_use_default_link, [dnl
1398 libc_cv_use_default_link=no
1399 cat > conftest.s <<\EOF
1400 .section .note.a,"a",%note
1405 .section .note.b,"a",%note
1411 if AC_TRY_COMMAND([dnl
1412 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1413 ac_try=`$READELF -S conftest.so | sed -n \
1415 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1421 libc_seen_a=no libc_seen_b=no
1423 while test $# -ge 2 -a "$1" = NOTE; do
1425 .note.a) libc_seen_a=yes ;;
1426 .note.b) libc_seen_b=yes ;;
1430 case "$libc_seen_a$libc_seen_b" in
1432 libc_cv_use_default_link=yes
1435 echo >&AS_MESSAGE_LOG_FD "\
1436 $libc_seen_a$libc_seen_b from:
1442 use_default_link=$libc_cv_use_default_link
1445 AC_CACHE_CHECK(for GLOB_DAT reloc,
1446 libc_cv_has_glob_dat, [dnl
1447 cat > conftest.c <<EOF
1449 int foo (void) { return mumble; }
1451 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1452 -fPIC -shared -o conftest.so conftest.c
1453 -nostdlib -nostartfiles $no_ssp
1454 1>&AS_MESSAGE_LOG_FD])
1456 dnl look for GLOB_DAT relocation.
1457 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1458 libc_cv_has_glob_dat=yes
1460 libc_cv_has_glob_dat=no
1463 libc_cv_has_glob_dat=no
1466 AC_SUBST(libc_cv_has_glob_dat)
1468 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1469 if libc_cv_output_format=`
1470 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1474 libc_cv_output_format=
1476 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1477 AC_SUBST(libc_cv_output_format)
1479 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1480 cat > conftest.c <<EOF
1483 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1484 conftest.c 1>&AS_MESSAGE_LOG_FD])
1486 libc_cv_fno_toplevel_reorder=yes
1488 libc_cv_fno_toplevel_reorder=no
1491 if test $libc_cv_fno_toplevel_reorder = yes; then
1492 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1494 fno_unit_at_a_time=-fno-unit-at-a-time
1496 AC_SUBST(fno_unit_at_a_time)
1498 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1500 cat > conftest.c <<EOF
1507 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1508 conftest.c 1>&AS_MESSAGE_LOG_FD])
1510 libc_cv_mtls_dialect_gnu2=yes
1512 libc_cv_mtls_dialect_gnu2=no
1515 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1516 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1518 AC_CACHE_CHECK(whether cc puts quotes around section names,
1519 libc_cv_have_section_quotes,
1520 [cat > conftest.c <<EOF
1521 static const int foo
1522 __attribute__ ((section ("bar"))) = 1;
1524 if ${CC-cc} -S conftest.c -o conftest.s; then
1525 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1526 libc_cv_have_section_quotes=yes
1528 libc_cv_have_section_quotes=no
1531 libc_cv_have_section_quotes=unknown
1533 rm -f conftest.{c,s}
1535 if test $libc_cv_have_section_quotes = yes; then
1536 AC_DEFINE(HAVE_SECTION_QUOTES)
1539 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1540 cat > conftest.c <<\EOF
1543 __builtin_memset (x, 0, 1000);
1547 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1549 libc_cv_gcc_builtin_memset=no
1551 libc_cv_gcc_builtin_memset=yes
1554 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1555 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1558 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1559 cat > conftest.c <<\EOF
1560 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1561 char *foo (const char *a, const char *b)
1563 return __builtin_strstr (a, b);
1567 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1569 libc_cv_gcc_builtin_redirection=yes
1571 libc_cv_gcc_builtin_redirection=no
1574 if test "$libc_cv_gcc_builtin_redirection" = no; then
1575 AC_MSG_ERROR([support for the symbol redirection needed])
1578 dnl Determine how to disable generation of FMA instructions.
1579 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1580 libc_cv_cc_nofma, [dnl
1582 for opt in -ffp-contract=off -mno-fused-madd; do
1583 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1585 AC_SUBST(libc_cv_cc_nofma)
1587 if test -n "$submachine"; then
1588 AC_CACHE_CHECK([for compiler option for CPU variant],
1589 libc_cv_cc_submachine, [dnl
1590 libc_cv_cc_submachine=no
1591 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1592 LIBC_TRY_CC_OPTION([$opt], [
1593 libc_cv_cc_submachine="$opt"
1596 if test "x$libc_cv_cc_submachine" = xno; then
1597 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1600 AC_SUBST(libc_cv_cc_submachine)
1602 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1603 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1604 cat > conftest.c <<EOF
1606 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1609 libc_cv_cc_loop_to_function=no
1610 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1612 libc_cv_cc_loop_to_function=yes
1615 if test $libc_cv_cc_loop_to_function = yes; then
1616 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1618 AC_SUBST(libc_cv_cc_loop_to_function)
1620 dnl Check whether we have the gd library available.
1621 AC_MSG_CHECKING(for libgd)
1622 if test "$with_gd" != "no"; then
1623 old_CFLAGS="$CFLAGS"
1624 CFLAGS="$CFLAGS $libgd_include"
1625 old_LDFLAGS="$LDFLAGS"
1626 LDFLAGS="$LDFLAGS $libgd_ldflags"
1628 LIBS="$LIBS -lgd -lpng -lz -lm"
1629 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1630 CFLAGS="$old_CFLAGS"
1631 LDFLAGS="$old_LDFLAGS"
1636 AC_MSG_RESULT($LIBGD)
1640 if test x$with_selinux = xno ; then
1643 # See if we have the SELinux library
1644 AC_CHECK_LIB(selinux, is_selinux_enabled,
1645 have_selinux=yes, have_selinux=no)
1646 if test x$with_selinux = xyes ; then
1647 if test x$have_selinux = xno ; then
1648 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1652 # Check if we're building with SELinux support.
1653 if test "x$have_selinux" = xyes; then
1654 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1656 # See if we have the libaudit library
1657 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1658 have_libaudit=yes, have_libaudit=no)
1659 if test "x$have_libaudit" = xyes; then
1660 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1662 AC_SUBST(have_libaudit)
1664 # See if we have the libcap library
1665 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1666 if test "x$have_libcap" = xyes; then
1667 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1669 AC_SUBST(have_libcap)
1671 AC_SUBST(have_selinux)
1674 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1675 dnl Since we are building the implementations of the fortified functions here,
1676 dnl having the macro defined interacts very badly.
1677 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1678 [AC_TRY_COMPILE([], [
1679 #ifdef _FORTIFY_SOURCE
1682 [libc_cv_predef_fortify_source=no],
1683 [libc_cv_predef_fortify_source=yes])])
1684 if test $libc_cv_predef_fortify_source = yes; then
1685 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1689 # Some linkers on some architectures support __ehdr_start but with
1690 # bugs. Make sure usage of it does not create relocations in the
1691 # output (as the linker should resolve them all for us).
1692 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1693 libc_cv_ehdr_start, [
1694 old_CFLAGS="$CFLAGS"
1695 old_LDFLAGS="$LDFLAGS"
1697 CFLAGS="$CFLAGS -fPIC"
1698 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1700 AC_LINK_IFELSE([AC_LANG_SOURCE([
1705 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1706 long ehdr (void) { return __ehdr_start.val; }
1708 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1709 libc_cv_ehdr_start=broken
1711 libc_cv_ehdr_start=yes
1712 fi], [libc_cv_ehdr_start=no])
1713 CFLAGS="$old_CFLAGS"
1714 LDFLAGS="$old_LDFLAGS"
1717 if test "$libc_cv_ehdr_start" = yes; then
1718 AC_DEFINE([HAVE_EHDR_START])
1719 elif test "$libc_cv_ehdr_start" = broken; then
1720 AC_MSG_WARN([linker is broken -- you should upgrade])
1723 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1724 libc_cv_builtin_trap, [dnl
1725 libc_cv_builtin_trap=no
1726 AC_TRY_COMPILE([], [__builtin_trap ()], [
1727 libc_undefs=`$NM -u conftest.o |
1728 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1729 2>&AS_MESSAGE_LOG_FD` || {
1730 AC_MSG_ERROR([confusing output from $NM -u])
1732 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1733 if test -z "$libc_undefs"; then
1734 libc_cv_builtin_trap=yes
1736 if test $libc_cv_builtin_trap = yes; then
1737 AC_DEFINE([HAVE_BUILTIN_TRAP])
1740 dnl C++ feature tests.
1743 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1744 libc_cv_cxx_thread_local, [
1745 old_CXXFLAGS="$CXXFLAGS"
1746 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1747 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1750 // Compiler support.
1757 S * get () { return &s; }
1759 // libstdc++ support.
1760 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1761 #error __cxa_thread_atexit_impl not supported
1764 [libc_cv_cxx_thread_local=yes],
1765 [libc_cv_cxx_thread_local=no])
1766 CXXFLAGS="$old_CXXFLAGS"
1768 AC_SUBST(libc_cv_cxx_thread_local)
1771 dnl End of C++ feature tests.
1773 ### End of automated tests.
1774 ### Now run sysdeps configure fragments.
1776 # They also can set these variables.
1778 ldd_rewrite_script=no
1779 libc_cv_sysconfdir=$sysconfdir
1780 libc_cv_localstatedir=$localstatedir
1781 libc_cv_gcc_unwind_find_fde=no
1784 # Iterate over all the sysdep directories we will use, running their
1785 # configure fragments.
1786 for dir in $sysnames; do
1789 *) dest=$srcdir/$dir ;;
1791 if test -r $dest/configure; then
1792 AC_MSG_RESULT(running configure fragment for $dir)
1797 if test x"$build_mathvec" = xnotset; then
1800 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1802 AC_SUBST(libc_extra_cflags)
1803 AC_SUBST(libc_extra_cppflags)
1805 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1806 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1808 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1810 # A sysdeps configure fragment can reset this if IFUNC is not actually
1811 # usable even though the assembler knows how to generate the symbol type.
1812 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1813 AC_DEFINE(HAVE_IFUNC)
1815 LIBC_CONFIG_VAR([have-ifunc], [$libc_cv_ld_gnu_indirect_function])
1817 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1818 AC_DEFINE(HAVE_GCC_IFUNC)
1821 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1822 # configure fragment can override the value to prevent this AC_DEFINE.
1824 if test "x$use_nscd" != xno; then
1825 AC_DEFINE([USE_NSCD])
1827 if test "x$build_nscd" = xdefault; then
1828 build_nscd=$use_nscd
1831 AC_SUBST(libc_cv_slibdir)
1832 AC_SUBST(libc_cv_rtlddir)
1833 AC_SUBST(libc_cv_complocaledir)
1834 AC_SUBST(libc_cv_sysconfdir)
1835 AC_SUBST(libc_cv_localstatedir)
1836 AC_SUBST(libc_cv_rootsbindir)
1838 if test x$use_ldconfig = xyes; then
1839 AC_DEFINE(USE_LDCONFIG)
1841 AC_SUBST(use_ldconfig)
1842 AC_SUBST(ldd_rewrite_script)
1847 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1848 [libc_cv_pic_default=yes
1849 cat > conftest.c <<EOF
1850 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1851 # error PIC is default.
1854 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1855 libc_cv_pic_default=no
1858 AC_SUBST(libc_cv_pic_default)
1860 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1861 [libc_cv_cc_pie_default=yes
1862 cat > conftest.c <<EOF
1863 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1864 # error PIE is default.
1867 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1868 libc_cv_cc_pie_default=no
1871 libc_cv_pie_default=$libc_cv_cc_pie_default
1872 AC_SUBST(libc_cv_cc_pie_default)
1873 AC_SUBST(libc_cv_pie_default)
1875 # Set the `multidir' variable by grabbing the variable from the compiler.
1876 # We do it once and save the result in a generated makefile.
1877 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1878 AC_SUBST(libc_cv_multidir)
1880 if test "$static_pie" = yes; then
1881 # The linker must support --no-dynamic-linker.
1882 if test "$libc_cv_no_dynamic_linker" != yes; then
1883 AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1886 libc_cv_pie_default=yes
1887 AC_DEFINE(ENABLE_STATIC_PIE)
1889 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1892 AC_SUBST(static_nss)
1896 dnl See sysdeps/mach/configure.ac for this variable.
1897 AC_SUBST(mach_interface_list)
1899 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1900 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1904 AC_CONFIG_FILES([config.make Makefile])
1905 AC_CONFIG_COMMANDS([default],[[
1906 case $CONFIG_FILES in *config.make*)
1907 echo "$config_vars" >> config.make;;
1909 test -d bits || mkdir bits]],[[config_vars='$config_vars']])