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)
55 # We need the C++ compiler only for testing.
57 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
58 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
60 # Default, dynamic case.
61 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
62 [libc_cv_cxx_link_ok=yes],
63 [libc_cv_cxx_link_ok=no])
65 old_LDFLAGS="$LDFLAGS"
66 LDFLAGS="$LDFLAGS -static"
67 AC_LINK_IFELSE([AC_LANG_SOURCE([
73 std::cout << "Hello, world!";
78 [libc_cv_cxx_link_ok=no])
79 LDFLAGS="$old_LDFLAGS"
81 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
83 if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
84 AC_MSG_ERROR([you must configure in a separate build directory])
87 # This will get text that should go into config.make.
90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
92 AS_HELP_STRING([--with-gd=DIR],
93 [find libgd include dir and library with prefix DIR]),
97 *) libgd_include="-I$withval/include"
98 libgd_ldflags="-L$withval/lib" ;;
101 AC_ARG_WITH([gd-include],
102 AS_HELP_STRING([--with-gd-include=DIR],
103 [find libgd include files in DIR]),
105 case "$with_gd_include" in
107 *) libgd_include="-I$withval" ;;
110 AC_ARG_WITH([gd-lib],
111 AS_HELP_STRING([--with-gd-lib=DIR],
112 [find libgd library files in DIR]),
114 case "$with_gd_lib" in
116 *) libgd_ldflags="-L$withval" ;;
120 if test -n "$libgd_include"; then
121 config_vars="$config_vars
122 CFLAGS-memusagestat.c = $libgd_include"
124 if test -n "$libgd_ldflags"; then
125 config_vars="$config_vars
126 libgd-LDFLAGS = $libgd_ldflags"
129 dnl Arguments to specify presence of other packages/features.
130 AC_ARG_WITH([binutils],
131 AS_HELP_STRING([--with-binutils=PATH],
132 [specify location of binutils (as and ld)]),
133 [path_binutils=$withval],
135 AC_ARG_WITH([selinux],
136 AS_HELP_STRING([--with-selinux],
137 [if building with SELinux support]),
138 [with_selinux=$withval],
141 AC_ARG_WITH([headers],
142 AS_HELP_STRING([--with-headers=PATH],
143 [location of system headers to use
144 (for example /usr/src/linux/include)
145 @<:@default=compiler default@:>@]),
146 [sysheaders=$withval],
150 dnl Additional build flags injection.
151 AC_ARG_WITH([nonshared-cflags],
152 AS_HELP_STRING([--with-nonshared-cflags=CFLAGS],
153 [build nonshared libraries with additional CFLAGS]),
154 [extra_nonshared_cflags=$withval],
155 [extra_nonshared_cflags=])
156 AC_SUBST(extra_nonshared_cflags)
157 AC_ARG_WITH([rtld-early-cflags],
158 AS_HELP_STRING([--with-rtld-early-cflags=CFLAGS],
159 [build early initialization with additional CFLAGS]),
160 [rtld_early_cflags=$withval],
161 [rtld_early_cflags=])
162 AC_SUBST(rtld_early_cflags)
164 AC_ARG_WITH([timeoutfactor],
165 AS_HELP_STRING([--with-timeoutfactor=NUM],
166 [specify an integer to scale the timeout]),
167 [timeoutfactor=$withval],
169 AC_DEFINE_UNQUOTED(TIMEOUTFACTOR, $timeoutfactor)
171 AC_ARG_ENABLE([sanity-checks],
172 AS_HELP_STRING([--disable-sanity-checks],
173 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
174 [enable_sanity=$enableval],
177 AC_ARG_ENABLE([shared],
178 AS_HELP_STRING([--enable-shared],
179 [build shared library @<:@default=yes if GNU ld@:>@]),
182 AC_ARG_ENABLE([profile],
183 AS_HELP_STRING([--enable-profile],
184 [build profiled library @<:@default=no@:>@]),
185 [profile=$enableval],
187 AC_ARG_ENABLE([default-pie],
188 AS_HELP_STRING([--disable-default-pie],
189 [Do not build glibc programs and the testsuite as PIE @<:@default=no@:>@]),
190 [default_pie=$enableval],
192 AC_ARG_ENABLE([timezone-tools],
193 AS_HELP_STRING([--disable-timezone-tools],
194 [do not install timezone tools @<:@default=install@:>@]),
195 [enable_timezone_tools=$enableval],
196 [enable_timezone_tools=yes])
197 AC_SUBST(enable_timezone_tools)
199 AC_ARG_ENABLE([hardcoded-path-in-tests],
200 AS_HELP_STRING([--enable-hardcoded-path-in-tests],
201 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
202 [hardcoded_path_in_tests=$enableval],
203 [hardcoded_path_in_tests=no])
204 AC_SUBST(hardcoded_path_in_tests)
206 AC_ARG_ENABLE([hidden-plt],
207 AS_HELP_STRING([--disable-hidden-plt],
208 [do not hide internal function calls to avoid PLT]),
211 if test "x$hidden" = xno; then
215 AC_ARG_ENABLE([bind-now],
216 AS_HELP_STRING([--enable-bind-now],
217 [disable lazy relocations in DSOs]),
218 [bindnow=$enableval],
221 if test "x$bindnow" = xyes; then
225 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
226 dnl -fstack-protector-strong.
227 AC_ARG_ENABLE([stack-protector],
228 AS_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
229 [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
230 [enable_stack_protector=$enableval],
231 [enable_stack_protector=no])
232 case "$enable_stack_protector" in
233 all|yes|no|strong) ;;
234 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
237 dnl On some platforms we cannot use dynamic loading. We must provide
238 dnl static NSS modules.
239 AC_ARG_ENABLE([static-nss],
240 AS_HELP_STRING([--enable-static-nss],
241 [build static NSS modules @<:@default=no@:>@]),
242 [static_nss=$enableval],
244 dnl Enable static NSS also if we build no shared objects.
245 if test x"$static_nss" = xyes || test x"$shared" = xno; then
247 AC_DEFINE(DO_STATIC_NSS)
250 AC_ARG_ENABLE([force-install],
251 AS_HELP_STRING([--disable-force-install],
252 [don't force installation of files from this package, even if they are older than the installed files]),
253 [force_install=$enableval],
255 AC_SUBST(force_install)
257 AC_ARG_ENABLE([maintainer-mode],
258 AS_HELP_STRING([--enable-maintainer-mode],
259 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
260 [maintainer=$enableval],
263 dnl On some platforms we allow dropping compatibility with all kernel
265 AC_ARG_ENABLE([kernel],
266 AS_HELP_STRING([--enable-kernel=VERSION],
267 [compile for compatibility with kernel not older than VERSION]),
268 [minimum_kernel=$enableval],
270 dnl Prevent unreasonable values.
271 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
272 # Better nothing than this.
275 if test "$minimum_kernel" = current; then
276 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
280 dnl For the development we sometimes want gcc to issue even more warnings.
281 dnl This is not the default since many of the extra warnings are not
283 AC_ARG_ENABLE([all-warnings],
284 AS_HELP_STRING([--enable-all-warnings],
285 [enable all useful warnings gcc can issue]),
286 [all_warnings=$enableval],
288 AC_SUBST(all_warnings)
290 AC_ARG_ENABLE([werror],
291 AS_HELP_STRING([--disable-werror],
292 [do not build with -Werror]),
293 [enable_werror=$enableval],
295 AC_SUBST(enable_werror)
297 AC_ARG_ENABLE([multi-arch],
298 AS_HELP_STRING([--enable-multi-arch],
299 [enable single DSO with optimizations for multiple architectures]),
300 [multi_arch=$enableval],
301 [multi_arch=default])
303 AC_ARG_ENABLE([memory-tagging],
304 AS_HELP_STRING([--enable-memory-tagging],
305 [enable memory tagging if supported by the architecture @<:@default=no@:>@]),
306 [memory_tagging=$enableval],
308 if test "$memory_tagging" = yes; then
309 # Only enable this on architectures that support it.
316 AC_SUBST(memory_tagging)
318 AC_ARG_ENABLE([crypt],
319 AS_HELP_STRING([--disable-crypt],
320 [do not build nor install the passphrase hashing library, libcrypt]),
321 [build_crypt=$enableval],
323 AC_SUBST(build_crypt)
325 AC_ARG_ENABLE([nss-crypt],
326 AS_HELP_STRING([--enable-nss-crypt],
327 [enable libcrypt to use nss]),
328 [nss_crypt=$enableval],
330 if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
331 AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
334 if test x$nss_crypt = xyes; then
335 nss_includes=-I$(nss-config --includedir 2>/dev/null)
336 if test $? -ne 0; then
337 AC_MSG_ERROR([cannot find include directory with nss-config])
339 nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
340 if test $? -ne 0; then
341 AC_MSG_ERROR([cannot find include directory with nspr-config])
344 CFLAGS="$CFLAGS $nss_includes $nspr_includes"
345 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
347 #include <nsslowhash.h>
348 void f (void) { NSSLOW_Init (); }])],
349 libc_cv_nss_crypt=yes,
351 cannot find NSS headers with lowlevel hash function interfaces]))
353 old_LDFLAGS="$LDFLAGS"
354 LIBS="$LIBS -lfreebl3"
355 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
357 #include <nsslowhash.h>],
359 libc_cv_nss_crypt=yes,
361 cannot link program using lowlevel NSS hash functions]))
362 # Check to see if there is a static NSS cryptographic library.
363 # If there isn't then we can't link anything with libcrypt.a,
364 # and that might mean disabling some static tests.
365 LDFLAGS="$LDFLAGS -static"
366 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
368 #include <nsslowhash.h>],
370 libc_cv_static_nss_crypt=yes,
371 libc_cv_static_nss_crypt=no)
372 LDFLAGS="$old_LDFLAGS"
377 libc_cv_static_nss_crypt=no
379 AC_SUBST(libc_cv_nss_crypt)
380 AC_SUBST(libc_cv_static_nss_crypt)
383 AC_ARG_ENABLE([systemtap],
384 [AS_HELP_STRING([--enable-systemtap],
385 [enable systemtap static probe points @<:@default=no@:>@])],
386 [systemtap=$enableval],
388 if test "x$systemtap" != xno; then
389 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
391 CFLAGS="-std=gnu11 $CFLAGS"
392 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
393 void foo (int i, void *p)
395 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
396 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
397 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
398 CFLAGS="$old_CFLAGS"])
399 if test $libc_cv_sdt = yes; then
400 AC_DEFINE([USE_STAP_PROBE])
401 elif test "x$systemtap" != xauto; then
402 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
406 AC_ARG_ENABLE([build-nscd],
407 [AS_HELP_STRING([--disable-build-nscd],
408 [disable building and installing the nscd daemon])],
409 [build_nscd=$enableval],
410 [build_nscd=default])
413 # Note the use of $use_nscd is near the bottom of the file.
414 AC_ARG_ENABLE([nscd],
415 [AS_HELP_STRING([--disable-nscd],
416 [library functions will not contact the nscd daemon])],
417 [use_nscd=$enableval],
420 AC_ARG_ENABLE([pt_chown],
421 [AS_HELP_STRING([--enable-pt_chown],
422 [Enable building and installing pt_chown])],
423 [build_pt_chown=$enableval],
425 AC_SUBST(build_pt_chown)
426 if test "$build_pt_chown" = yes; then
427 AC_DEFINE(HAVE_PT_CHOWN)
430 # The abi-tags file uses a fairly simplistic model for name recognition that
431 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
432 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
433 # This doesn't get used much beyond that, so it's fairly safe.
438 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
442 AC_ARG_ENABLE([mathvec],
443 [AS_HELP_STRING([--enable-mathvec],
444 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
445 [build_mathvec=$enableval],
446 [build_mathvec=notset])
448 AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[]], [[
450 # error no CET compiler support
452 [libc_cv_compiler_default_cet=yes],
453 [libc_cv_compiler_default_cet=no])
456 AS_HELP_STRING([--enable-cet],
457 [enable Intel Control-flow Enforcement Technology (CET), x86 only]),
458 [enable_cet=$enableval],
459 [enable_cet=$libc_cv_compiler_default_cet])
462 AC_HELP_STRING([--disable-scv],
463 [syscalls will not use scv instruction, even if the kernel supports it, powerpc only]),
464 [use_scv=$enableval],
467 AS_IF([[test "$use_scv" != "no"]],[AC_DEFINE(USE_PPC_SCV)])
469 # We keep the original values in `$config_*' and never modify them, so we
470 # can write them unchanged into config.make. Everything else uses
471 # $machine, $vendor, and $os, and changes them whenever convenient.
472 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
474 # Don't allow vendor == "unknown"
475 test "$config_vendor" = unknown && config_vendor=
476 config_os="`echo $config_os | sed 's/^unknown-//'`"
478 # Some configurations imply other options.
481 # The configure fragment of a port can modify these to supplement
482 # or override the table in the case statement below. No fragment should
483 # ever change the config_* variables, however.
484 machine=$config_machine
485 vendor=$config_vendor
491 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
494 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
496 *) submachine="$withval" ;;
500 # An preconfigure script can set this when it wants to disable the sanity
504 # A preconfigure script for a system that may or may not use fpu
505 # sysdeps directories sets this to a preprocessor conditional for
506 # whether to use such directories.
509 dnl Let sysdeps/*/preconfigure act here.
510 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
514 ### By using the undocumented --enable-hacker-mode option for configure
515 ### one can skip this test to make the configuration not fail for unsupported
518 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
519 case "$machine-$host_os" in
524 *** The GNU C library is currently unavailable for this platform.
525 *** If you are interested in seeing glibc on this platform visit
526 *** the "How to submit a new port" in the wiki:
527 *** https://sourceware.org/glibc/wiki/#Development
528 *** and join the community!])
533 # Set base_machine if not set by a preconfigure fragment.
534 test -n "$base_machine" || base_machine=$machine
535 AC_SUBST(base_machine)
540 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
541 # The makefiles need to use a different form to find it in $srcdir.
542 INSTALL='\$(..)./scripts/install-sh -c'
548 # Accept binutils 2.25 or newer.
550 case $($LD --version) in
552 # Accept gold 1.14 or higher
553 AC_CHECK_PROG_VER(LD, $LD, --version,
554 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
555 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
556 LD=: critic_missing="$critic_missing GNU gold")
559 # Accept LLD 13.0.0 or higher
560 AC_CHECK_PROG_VER(LD, $LD, --version,
561 [LLD.* \([0-9][0-9]*\.[0-9.]*\)],
562 [1[3-9].*|[2-9][0-9].*],
563 LD=: critic_missing="$critic_missing LLD")
567 AC_CHECK_PROG_VER(LD, $LD, --version,
568 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
569 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
570 LD=: critic_missing="$critic_missing GNU ld")
573 LIBC_CONFIG_VAR([with-lld], [$libc_cv_with_lld])
575 # These programs are version sensitive.
576 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
577 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
578 [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
580 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
581 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
582 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
583 MSGFMT=: aux_missing="$aux_missing msgfmt")
584 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
585 [GNU texinfo.* \([0-9][0-9.]*\)],
586 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
587 MAKEINFO=: aux_missing="$aux_missing makeinfo")
588 AC_CHECK_PROG_VER(SED, sed, --version,
589 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
590 [3.0[2-9]*|3.[1-9]*|[4-9]*],
591 SED=: aux_missing="$aux_missing sed")
592 AC_CHECK_PROG_VER(AWK, gawk, --version,
593 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
594 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
595 AC_CHECK_PROG_VER(BISON, bison, --version,
596 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
597 [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
599 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
600 AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[]], [[
601 #if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
602 #error insufficient compiler
604 [libc_cv_compiler_ok=yes],
605 [libc_cv_compiler_ok=no])])
606 AS_IF([test $libc_cv_compiler_ok != yes],
607 [critic_missing="$critic_missing compiler"])
609 if test "x$maintainer" = "xyes"; then
610 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
612 xno|x|x:) AUTOCONF=no ;;
615 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
616 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
617 libc_cv_autoconf_works=yes
619 libc_cv_autoconf_works=no
621 test $libc_cv_autoconf_works = yes || AUTOCONF=no
624 if test "x$AUTOCONF" = xno; then
625 aux_missing="$aux_missing autoconf"
631 # Check for python3 if available, or else python.
632 AC_CHECK_PROG_VER(PYTHON_PROG, python3 python, --version,
633 [Python \([0-9][0-9.]*\)],
634 [3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
635 critic_missing="$critic_missing python")
636 PYTHON="$PYTHON_PROG -B"
639 test -n "$critic_missing" && AC_MSG_ERROR([
640 *** These critical programs are missing or too old:$critic_missing
641 *** Check the INSTALL file for required versions.])
643 test -n "$aux_missing" && AC_MSG_WARN([
644 *** These auxiliary programs are missing or incompatible versions:$aux_missing
645 *** some features or tests will be disabled.
646 *** Check the INSTALL file for required versions.])
649 # Determine whether to use fpu or nofpu sysdeps directories.
650 AC_CACHE_CHECK([for use of fpu sysdeps directories],
651 libc_cv_with_fp, [dnl
652 cat > conftest.c <<EOF
656 # error "no hardware floating point"
660 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
661 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
665 AC_SUBST(libc_cv_with_fp)
667 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
668 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
673 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
674 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
675 [libc_cv_ssp_strong=yes],
676 [libc_cv_ssp_strong=no])
679 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
680 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
681 [libc_cv_ssp_all=yes],
682 [libc_cv_ssp_all=no])
687 if test "$libc_cv_ssp" = yes; then
688 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
689 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
692 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
693 stack_protector="-fstack-protector"
694 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
695 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
696 stack_protector="-fstack-protector-all"
697 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
698 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
699 stack_protector="-fstack-protector-strong"
700 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
702 stack_protector="-fno-stack-protector"
703 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
705 AC_SUBST(libc_cv_ssp)
706 AC_SUBST(stack_protector)
707 AC_SUBST(no_stack_protector)
709 if test -n "$stack_protector"; then
710 dnl Don't run configure tests with stack-protection on, to avoid problems with
712 no_ssp=-fno-stack-protector
716 if test "$enable_stack_protector" != no; then
717 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
721 # For the multi-arch option we need support in the assembler & linker.
722 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
723 libc_cv_ld_gnu_indirect_function, [dnl
724 cat > conftest.S <<EOF
725 .type foo,%gnu_indirect_function
738 libc_cv_ld_gnu_indirect_function=no
739 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
740 -nostartfiles -nostdlib $no_ssp \
741 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
742 # Do a link to see if the backend supports IFUNC relocs.
743 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
744 LC_ALL=C $READELF -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && {
745 libc_cv_ld_gnu_indirect_function=yes
750 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
751 AC_CACHE_CHECK([for gcc attribute ifunc support],
752 libc_cv_gcc_indirect_function, [dnl
753 cat > conftest.c <<EOF
754 extern int func (int);
755 int used_func (int a)
759 static void *resolver ()
763 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
765 libc_cv_gcc_indirect_function=no
766 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
767 2>&AS_MESSAGE_LOG_FD ; then
768 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
769 libc_cv_gcc_indirect_function=yes
774 # Check if linker supports textrel relocation with ifunc (used on elf/tests).
775 # Note that it relies on libc_cv_ld_gnu_indirect_function test above.
776 AC_CACHE_CHECK([whether the linker supports textrels along with ifunc],
777 libc_cv_textrel_ifunc, [dnl
778 cat > conftest.S <<EOF
779 .type foo,%gnu_indirect_function
800 libc_cv_textrel_ifunc=no
801 if test $libc_cv_ld_gnu_indirect_function = yes; then
802 if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp -pie -o conftest conftest.S); then
803 libc_cv_textrel_ifunc=yes
807 AC_SUBST(libc_cv_textrel_ifunc)
809 # Check if CC supports attribute retain as it is used in attribute_used_retain macro.
810 AC_CACHE_CHECK([for GNU attribute retain support],
811 libc_cv_gnu_retain, [dnl
812 cat > conftest.c <<EOF
813 static int var __attribute__ ((used, retain, section ("__libc_atexit")));
815 libc_cv_gnu_retain=no
816 if ${CC-cc} -Werror -c conftest.c -o /dev/null 1>&AS_MESSAGE_LOG_FD \
817 2>&AS_MESSAGE_LOG_FD ; then
818 libc_cv_gnu_retain=yes
821 if test $libc_cv_gnu_retain = yes; then
822 AC_DEFINE(HAVE_GNU_RETAIN)
824 LIBC_CONFIG_VAR([have-gnu-retain], [$libc_cv_gnu_retain])
826 # Check if gcc warns about alias for function with incompatible types.
827 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
828 libc_cv_gcc_incompatible_alias, [dnl
829 cat > conftest.c <<EOF
830 int __redirect_foo (const void *s, int c);
832 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
833 __typeof (__redirect_foo) *foo_impl (void)
838 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
840 libc_cv_gcc_incompatible_alias=yes
841 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
842 libc_cv_gcc_incompatible_alias=no
846 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
847 if test x"$multi_arch" = xyes; then
848 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
853 if test x"$libc_cv_gcc_indirect_function" != xyes; then
854 # GCC 8+ emits a warning for alias with incompatible types and it might
855 # fail to build ifunc resolvers aliases to either weak or internal
856 # symbols. Disables multiarch build in this case.
857 if test x"$libc_cv_gcc_incompatible_alias" = xyes; then
858 AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
859 if test x"$multi_arch" = xyes; then
860 AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
862 AC_MSG_WARN([Multi-arch is disabled.])
864 elif test x"$multi_arch" = xyes; then
865 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
866 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
870 if test x"$multi_arch" != xno; then
871 multi_arch_d=/multiarch
874 # Compute the list of sysdep directories for this configuration.
875 # This can take a while to compute.
876 sysdep_dir=$srcdir/sysdeps
877 AC_MSG_CHECKING(sysdep dirs)
878 dnl We need to use [ and ] for other purposes for a while now.
880 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
881 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
883 test "x$base_os" != x || case "$os" in
890 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
893 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
897 o=`echo $tail | sed 's/[0-9]*$//'`
898 if test $o != $tail; then
901 # For linux-gnu, try linux-gnu, then linux.
902 o=`echo $tail | sed 's/-.*$//'`
903 if test $o != $tail; then
907 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
910 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
916 # For sparc/sparc32, try sparc/sparc32 and then sparc.
918 tail=$machine${submachine:+/$submachine}
919 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
921 # Prepend the machine's FPU directory unless the architecture specific
922 # preconfigure disables it.
923 if test "$libc_cv_with_fp" = yes; then
928 # For each machine term, try it with and then without /multiarch.
929 for try_fpu in $maybe_fpu ''; do
930 for try_multi in $multi_arch_d ''; do
931 mach="$mach /$1$try_fpu$try_multi"
937 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
940 # Find what sysdep directories exist.
942 for b in $base ''; do
943 for m0 in $mach ''; do
944 for v in /$vendor ''; do
945 test "$v" = / && continue
946 for o in /$ostry ''; do
947 test "$o" = / && continue
948 for m in $mach ''; do
949 try_suffix="$m0$b$v$o$m"
950 if test -n "$try_suffix"; then
951 try_srcdir="${srcdir}/"
952 try="sysdeps$try_suffix"
953 test -n "$enable_debug_configure" &&
954 echo "$0 [DEBUG]: try $try" >&2
955 if test -d "$try_srcdir$try"; then
956 sysnames="$sysnames $try"
957 { test -n "$o" || test -n "$b"; } && os_used=t
958 { test -n "$m" || test -n "$m0"; } && machine_used=t
960 x*/$submachine) submachine_used=t ;;
970 # If the assembler supports gnu_indirect_function symbol type and the
971 # architecture supports multi-arch, we enable multi-arch by default.
976 test x"$multi_arch" = xdefault && multi_arch=no
979 if test x"$multi_arch" != xno; then
980 AC_DEFINE(USE_MULTIARCH)
984 if test -z "$os_used" && test "$os" != none; then
985 AC_MSG_ERROR(Operating system $os is not supported.)
987 if test -z "$machine_used" && test "$machine" != none; then
988 AC_MSG_ERROR(The $machine is not supported.)
990 if test -z "$submachine_used" && test -n "$submachine"; then
991 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
995 # We have now validated the configuration.
997 # Expand the list of system names into a full list of directories
998 # from each element's parent name and Implies file (if present).
1001 while test $# -gt 0; do
1005 case " $names " in *" $name "*)
1006 # Already in the list.
1010 # Report each name as we discover it, so there is no long pause in output.
1011 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
1013 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
1017 *) xsrcdir=$srcdir/ ;;
1019 test -n "$enable_debug_configure" &&
1020 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
1022 for implies_file in Implies Implies-before Implies-after; do
1023 implies_type=`echo $implies_file | sed s/-/_/`
1024 eval ${implies_type}=
1025 if test -f $xsrcdir$name/$implies_file; then
1026 # Collect more names from the `Implies' file (removing comments).
1027 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
1028 for x in $implied_candidate; do
1030 if test -d $xsrcdir$name_base/$x; then
1031 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
1036 test -n "$enable_debug_configure" &&
1037 echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
1038 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
1040 eval "${implies_type}=\"\$${implies_type} \$try\""
1043 if test $found = no; then
1044 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
1050 # Add NAME to the list of names.
1051 names="$names $name"
1053 # Find the parent of NAME, using the empty string if it has none.
1055 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
1058 test -n "$enable_debug_configure" &&
1059 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
1060 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
1062 # Add the names implied by NAME, and NAME's parent (if it has one), to
1063 # the list of names to be processed (the argument list). We prepend the
1064 # implied names to the list and append the parent. We want implied
1065 # directories to come before further directories inferred from the
1066 # configuration components; this ensures that for sysv4, unix/common
1067 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
1069 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
1070 test -n "$sysnames" && set $sysnames
1073 # Add the default directories.
1074 default_sysnames="sysdeps/generic"
1075 sysnames="$names $default_sysnames"
1077 # The other names were emitted during the scan.
1078 AC_MSG_RESULT($default_sysnames)
1080 # if using special system headers, find out the compiler's sekrit
1081 # header directory and add that to the list. NOTE: Only does the right
1082 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1083 if test -n "$sysheaders"; then
1084 SYSINCLUDES=-nostdinc
1085 for d in include include-fixed; do
1086 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1087 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1089 SYSINCLUDES="$SYSINCLUDES \
1090 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1091 if test -n "$CXX"; then
1093 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1094 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1095 test "x$cxxheaders" != x &&
1096 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1100 AC_SUBST(SYSINCLUDES)
1101 AC_SUBST(CXX_SYSINCLUDES)
1103 # Obtain some C++ header file paths. This is used to make a local
1104 # copy of those headers in Makerules.
1105 if test -n "$CXX"; then
1106 find_cxx_header () {
1107 echo "#include <$1>" | $CXX -H -fsyntax-only -x c++ - 2>&1 \
1108 | $AWK '$1 == "."{print $2}'
1110 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1111 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1112 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1114 AC_SUBST(CXX_CSTDLIB_HEADER)
1115 AC_SUBST(CXX_CMATH_HEADER)
1116 AC_SUBST(CXX_BITS_STD_ABS_H)
1118 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1119 # since this would lead to problems installing/building glibc.
1120 # LD_LIBRARY_PATH contains the current directory if one of the following
1122 # - one of the terminals (":" and ";") is the first or last sign
1123 # - two terminals occur directly after each other
1124 # - the path contains an element with a dot in it
1125 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1127 case ${LD_LIBRARY_PATH} in
1128 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1129 ld_library_path_setting="contains current directory"
1132 ld_library_path_setting="ok"
1136 AC_MSG_RESULT($ld_library_path_setting)
1137 if test "$ld_library_path_setting" != "ok"; then
1139 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1140 *** building glibc. Please change the environment variable
1141 *** and run configure again.])
1144 AC_PATH_PROG(BASH_SHELL, bash, no)
1146 AC_PATH_PROG(PERL, perl, no)
1147 if test "$PERL" != no &&
1148 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1151 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1152 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1154 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1155 cat > conftest.s <<EOF
1158 .set glibc_conftest_frobozz,foo
1159 .globl glibc_conftest_frobozz
1161 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1162 # (but it doesn't work), so we must do a linking check to be sure.
1163 cat > conftest1.c <<\EOF
1164 extern int glibc_conftest_frobozz;
1165 void _start() { glibc_conftest_frobozz = 1; }
1167 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1168 -nostartfiles -nostdlib $no_ssp \
1169 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1170 libc_cv_asm_set_directive=yes
1172 libc_cv_asm_set_directive=no
1175 if test $libc_cv_asm_set_directive = yes; then
1176 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1179 AC_CACHE_CHECK(linker support for protected data symbol,
1180 libc_cv_protected_data,
1181 [cat > conftest.c <<EOF
1182 int bar __attribute__ ((visibility ("protected"))) = 1;
1184 libc_cv_protected_data=no
1185 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1186 cat > conftest.c <<EOF
1188 int main (void) { return bar; }
1190 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1191 libc_cv_protected_data=yes
1196 AC_SUBST(libc_cv_protected_data)
1198 AC_CACHE_CHECK(linker support for INSERT in linker script,
1200 [cat > conftest.c <<EOF
1201 int __attribute__ ((section(".bar"))) bar = 0x12345678;
1202 int test (void) { return bar; }
1204 cat > conftest.t <<EOF
1209 INSERT AFTER .rela.dyn;
1212 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1217 AC_SUBST(libc_cv_insert)
1219 AC_CACHE_CHECK(for broken __attribute__((alias())),
1220 libc_cv_broken_alias_attribute,
1221 [cat > conftest.c <<EOF
1222 extern int foo (int x) __asm ("xyzzy");
1223 int bar (int x) { return x; }
1224 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1226 extern __typeof (dfoo) dfoo __asm ("abccb");
1229 libc_cv_broken_alias_attribute=yes
1230 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1231 if grep 'xyzzy' conftest.s >/dev/null &&
1232 grep 'abccb' conftest.s >/dev/null; then
1233 libc_cv_broken_alias_attribute=no
1236 rm -f conftest.c conftest.s
1238 if test $libc_cv_broken_alias_attribute = yes; then
1239 AC_MSG_ERROR(working alias attribute support required)
1242 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1243 libc_cv_have_sdata_section,
1244 [echo "int i;" > conftest.c
1245 libc_cv_have_sdata_section=no
1246 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1247 | grep '\.sdata' >/dev/null; then
1248 libc_cv_have_sdata_section=yes
1250 rm -f conftest.c conftest.so
1252 if test $libc_cv_have_sdata_section = yes; then
1253 AC_DEFINE(HAVE_SDATA_SECTION)
1256 AC_CACHE_CHECK(for libunwind-support in compiler,
1257 libc_cv_cc_with_libunwind, [
1258 cat > conftest.c <<EOF
1259 int main (void) { return 0; }
1261 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1262 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1263 libc_cv_cc_with_libunwind=yes
1265 libc_cv_cc_with_libunwind=no
1268 AC_SUBST(libc_cv_cc_with_libunwind)
1269 if test $libc_cv_cc_with_libunwind = yes; then
1270 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1274 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1275 libc_cv_as_noexecstack, [dnl
1276 cat > conftest.c <<EOF
1279 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1280 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1281 && grep .note.GNU-stack conftest.s >/dev/null \
1282 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1283 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1285 libc_cv_as_noexecstack=yes
1287 libc_cv_as_noexecstack=no
1290 if test $libc_cv_as_noexecstack = yes; then
1291 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1293 AC_SUBST(ASFLAGS_config)
1295 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1296 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1297 AC_SUBST(libc_cv_z_execstack)
1299 LIBC_LINKER_FEATURE([-z start-stop-gc], [-Wl,-z,start-stop-gc],
1300 [libc_cv_z_start_stop_gc=yes], [libc_cv_z_start_stop_gc=no])
1301 LIBC_CONFIG_VAR([have-z-start-stop-gc], [$libc_cv_z_start_stop_gc])
1303 LIBC_LINKER_FEATURE([--depaudit], [-Wl,--depaudit,x],
1304 [libc_cv_depaudit=yes], [libc_cv_depaudit=no])
1305 LIBC_CONFIG_VAR([have-depaudit], [$libc_cv_depaudit])
1307 LIBC_LINKER_FEATURE([-z pack-relative-relocs],
1308 [-Wl,-z,pack-relative-relocs],
1309 [libc_cv_dt_relr=yes], [libc_cv_dt_relr=no])
1310 LIBC_CONFIG_VAR([have-dt-relr], [$libc_cv_dt_relr])
1312 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1313 [-Wl,--no-dynamic-linker],
1314 [libc_cv_no_dynamic_linker=yes],
1315 [libc_cv_no_dynamic_linker=no])
1316 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1318 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1319 LIBC_TRY_CC_OPTION([-static-pie],
1320 [libc_cv_static_pie=yes],
1321 [libc_cv_static_pie=no])
1323 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1325 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1326 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1329 AC_SUBST(libc_cv_fpie)
1331 AC_CACHE_CHECK(for GLOB_DAT reloc,
1332 libc_cv_has_glob_dat, [dnl
1333 cat > conftest.c <<EOF
1335 int foo (void) { return mumble; }
1337 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1338 -fPIC -shared -o conftest.so conftest.c
1339 -nostdlib -nostartfiles $no_ssp
1340 1>&AS_MESSAGE_LOG_FD])
1342 dnl look for GLOB_DAT relocation.
1343 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1344 libc_cv_has_glob_dat=yes
1346 libc_cv_has_glob_dat=no
1349 libc_cv_has_glob_dat=no
1352 AC_SUBST(libc_cv_has_glob_dat)
1354 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1356 cat > conftest.c <<EOF
1363 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=gnu2 -nostdlib -nostartfiles
1364 conftest.c -o conftest 1>&AS_MESSAGE_LOG_FD])
1366 libc_cv_mtls_dialect_gnu2=yes
1368 libc_cv_mtls_dialect_gnu2=no
1371 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1372 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1374 dnl clang emits an warning for a double alias redirection, to warn the
1375 dnl original symbol is sed even when weak definition overriddes it.
1376 dnl It is a usual pattern for weak_alias, where multiple alias point to
1378 AC_CACHE_CHECK([if -Wno-ignored-attributes is required for aliases],
1379 libc_cv_wno_ignored_attributes, [dnl
1380 cat > conftest.c <<EOF
1384 extern __typeof (__foo) foo __attribute__ ((weak, alias ("__foo")));
1385 extern __typeof (__foo) bar __attribute__ ((weak, alias ("foo")));
1387 libc_cv_wno_ignored_attributes=""
1388 if ! AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c])
1390 libc_cv_wno_ignored_attributes="-Wno-ignored-attributes"
1393 LIBC_CONFIG_VAR([config-cflags-wno-ignored-attributes],
1394 [$libc_cv_wno_ignored_attributes])
1396 AC_CACHE_CHECK(whether cc puts quotes around section names,
1397 libc_cv_have_section_quotes,
1398 [cat > conftest.c <<EOF
1399 static const int foo
1400 __attribute__ ((section ("bar"))) = 1;
1402 if ${CC-cc} -S conftest.c -o conftest.s; then
1403 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1404 libc_cv_have_section_quotes=yes
1406 libc_cv_have_section_quotes=no
1409 libc_cv_have_section_quotes=unknown
1411 rm -f conftest.{c,s}
1413 if test $libc_cv_have_section_quotes = yes; then
1414 AC_DEFINE(HAVE_SECTION_QUOTES)
1417 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1418 cat > conftest.c <<\EOF
1421 __builtin_memset (x, 0, 1000);
1425 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1427 libc_cv_gcc_builtin_memset=no
1429 libc_cv_gcc_builtin_memset=yes
1432 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1433 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1436 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1437 cat > conftest.c <<\EOF
1438 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1439 char *foo (const char *a, const char *b)
1441 return __builtin_strstr (a, b);
1445 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1447 libc_cv_gcc_builtin_redirection=yes
1449 libc_cv_gcc_builtin_redirection=no
1452 if test "$libc_cv_gcc_builtin_redirection" = no; then
1453 AC_MSG_ERROR([support for the symbol redirection needed])
1456 dnl Determine how to disable generation of FMA instructions.
1457 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1458 libc_cv_cc_nofma, [dnl
1460 for opt in -ffp-contract=off -mno-fused-madd; do
1461 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1463 AC_SUBST(libc_cv_cc_nofma)
1465 if test -n "$submachine"; then
1466 AC_CACHE_CHECK([for compiler option for CPU variant],
1467 libc_cv_cc_submachine, [dnl
1468 libc_cv_cc_submachine=no
1469 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1470 LIBC_TRY_CC_OPTION([$opt], [
1471 libc_cv_cc_submachine="$opt"
1474 if test "x$libc_cv_cc_submachine" = xno; then
1475 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1478 AC_SUBST(libc_cv_cc_submachine)
1480 dnl Determine if compiler supports -fsignaling-nans
1481 AC_CACHE_CHECK([for compiler option that -fsignaling-nans],
1482 libc_cv_cc_signaling_nans, [dnl
1483 LIBC_TRY_CC_OPTION([-Werror -fsignaling-nans],
1484 [libc_cv_cc_signaling_nans=-fsignaling-nans],
1485 [libc_cv_cc_signaling_nans=])
1487 LIBC_CONFIG_VAR([config-cflags-signaling-nans],
1488 [$libc_cv_cc_signaling_nans])
1490 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1491 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1492 cat > conftest.c <<EOF
1494 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1497 libc_cv_cc_loop_to_function=no
1498 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1500 libc_cv_cc_loop_to_function=yes
1503 if test $libc_cv_cc_loop_to_function = yes; then
1504 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1506 AC_SUBST(libc_cv_cc_loop_to_function)
1508 dnl Check whether we have the gd library available.
1509 AC_MSG_CHECKING(for libgd)
1510 if test "$with_gd" != "no"; then
1511 old_CFLAGS="$CFLAGS"
1512 CFLAGS="$CFLAGS $libgd_include"
1513 old_LDFLAGS="$LDFLAGS"
1514 LDFLAGS="$LDFLAGS $libgd_ldflags"
1516 LIBS="$LIBS -lgd -lpng -lz -lm"
1517 AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <gd.h>]], [[gdImagePng (0, 0)]])],
1518 [LIBGD=yes], [LIBGD=no])
1519 CFLAGS="$old_CFLAGS"
1520 LDFLAGS="$old_LDFLAGS"
1525 AC_MSG_RESULT($LIBGD)
1529 if test x$with_selinux = xno ; then
1532 # See if we have the SELinux library
1533 AC_CHECK_LIB(selinux, is_selinux_enabled,
1534 have_selinux=yes, have_selinux=no)
1535 if test x$with_selinux = xyes ; then
1536 if test x$have_selinux = xno ; then
1537 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1541 # Check if we're building with SELinux support.
1542 if test "x$have_selinux" = xyes; then
1543 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1545 # See if we have the libaudit library
1546 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1547 have_libaudit=yes, have_libaudit=no)
1548 if test "x$have_libaudit" = xyes; then
1549 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1551 AC_SUBST(have_libaudit)
1553 # See if we have the libcap library
1554 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1555 if test "x$have_libcap" = xyes; then
1556 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1558 AC_SUBST(have_libcap)
1560 AC_SUBST(have_selinux)
1563 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1564 dnl Since we are building the implementations of the fortified functions here,
1565 dnl having the macro defined interacts very badly.
1566 dnl _FORTIFY_SOURCE requires compiler optimization level 1 (gcc -O1)
1567 dnl and above (see "man FEATURE_TEST_MACROS").
1568 dnl So do NOT replace AC_COMPILE_IFELSE with AC_PREPROC_IFELSE.
1569 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1570 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
1571 #ifdef _FORTIFY_SOURCE
1574 [libc_cv_predef_fortify_source=no],
1575 [libc_cv_predef_fortify_source=yes])])
1576 if test $libc_cv_predef_fortify_source = yes; then
1577 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1581 dnl Starting with binutils 2.35, GAS can attach multiple symbol versions
1582 dnl to one symbol (PR 23840).
1583 AC_CACHE_CHECK(whether the assembler requires one version per symbol,
1584 libc_cv_symver_needs_alias, [dnl
1585 cat > conftest.s <<EOF
1589 .symver testfunc, testfunc1@VERSION1
1590 .symver testfunc, testfunc1@VERSION2
1592 libc_cv_symver_needs_alias=no
1593 if ${CC-cc} $ASFLAGS -c conftest.s 2>&AS_MESSAGE_LOG_FD; then
1594 libc_cv_symver_needs_alias=no
1596 libc_cv_symver_needs_alias=yes
1600 if test "$libc_cv_symver_needs_alias" = yes; then
1601 AC_DEFINE(SYMVER_NEEDS_ALIAS)
1604 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1605 libc_cv_builtin_trap, [dnl
1606 libc_cv_builtin_trap=no
1607 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[__builtin_trap ()]])],[
1608 libc_undefs=`$NM -u conftest.o |
1609 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1610 2>&AS_MESSAGE_LOG_FD` || {
1611 AC_MSG_ERROR([confusing output from $NM -u])
1613 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1614 if test -z "$libc_undefs"; then
1615 libc_cv_builtin_trap=yes
1617 if test $libc_cv_builtin_trap = yes; then
1618 AC_DEFINE([HAVE_BUILTIN_TRAP])
1621 dnl C++ feature tests.
1624 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1625 libc_cv_cxx_thread_local, [
1626 old_CXXFLAGS="$CXXFLAGS"
1627 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1628 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1631 // Compiler support.
1638 S * get () { return &s; }
1640 // libstdc++ support.
1641 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1642 #error __cxa_thread_atexit_impl not supported
1645 [libc_cv_cxx_thread_local=yes],
1646 [libc_cv_cxx_thread_local=no])
1647 CXXFLAGS="$old_CXXFLAGS"
1649 AC_SUBST(libc_cv_cxx_thread_local)
1652 dnl End of C++ feature tests.
1654 ### End of automated tests.
1655 ### Now run sysdeps configure fragments.
1657 # They also can set these variables.
1659 ldd_rewrite_script=no
1660 libc_cv_sysconfdir=$sysconfdir
1661 libc_cv_localstatedir=$localstatedir
1662 libc_cv_gcc_unwind_find_fde=no
1666 # Iterate over all the sysdep directories we will use, running their
1667 # configure fragments.
1668 for dir in $sysnames; do
1671 *) dest=$srcdir/$dir ;;
1673 if test -r $dest/configure; then
1674 AC_MSG_RESULT(running configure fragment for $dir)
1679 if test x"$build_mathvec" = xnotset; then
1682 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1684 AC_SUBST(libc_extra_cflags)
1685 AC_SUBST(libc_extra_cppflags)
1687 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1688 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1690 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1692 # A sysdeps configure fragment can reset this if IFUNC is not actually
1693 # usable even though the assembler knows how to generate the symbol type.
1694 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1695 AC_DEFINE(HAVE_IFUNC)
1697 LIBC_CONFIG_VAR([have-ifunc], [$libc_cv_ld_gnu_indirect_function])
1699 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1700 AC_DEFINE(HAVE_GCC_IFUNC)
1702 LIBC_CONFIG_VAR([have-gcc-ifunc], [$libc_cv_gcc_indirect_function])
1704 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1705 # configure fragment can override the value to prevent this AC_DEFINE.
1707 if test "x$use_nscd" != xno; then
1708 AC_DEFINE([USE_NSCD])
1710 if test "x$build_nscd" = xdefault; then
1711 build_nscd=$use_nscd
1714 AC_SUBST(libc_cv_slibdir)
1715 AC_SUBST(libc_cv_rtlddir)
1716 AC_SUBST(libc_cv_complocaledir)
1717 AC_SUBST(libc_cv_sysconfdir)
1718 AC_SUBST(libc_cv_localstatedir)
1719 AC_SUBST(libc_cv_rootsbindir)
1721 if test x$use_ldconfig = xyes; then
1722 AC_DEFINE(USE_LDCONFIG)
1724 AC_SUBST(use_ldconfig)
1725 AC_SUBST(ldd_rewrite_script)
1730 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1731 [libc_cv_pic_default=yes
1732 cat > conftest.c <<EOF
1733 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1734 # error PIC is default.
1737 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1738 libc_cv_pic_default=no
1741 LIBC_CONFIG_VAR([build-pic-default], [$libc_cv_pic_default])
1743 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1744 [libc_cv_cc_pie_default=yes
1745 cat > conftest.c <<EOF
1746 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1747 # error PIE is default.
1750 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1751 libc_cv_cc_pie_default=no
1754 LIBC_CONFIG_VAR([cc-pie-default], [$libc_cv_cc_pie_default])
1756 AC_MSG_CHECKING(if we can build programs as PIE)
1757 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifdef PIE_UNSUPPORTED
1758 # error PIE is not supported
1759 #endif]])], [libc_cv_pie_supported=yes], [libc_cv_pie_supported=no])
1760 AC_MSG_RESULT($libc_cv_pie_supported)
1761 # Disable build-pie-default if target does not support it or glibc is
1762 # configured with --disable-default-pie.
1763 if test "x$default_pie" = xno; then
1764 build_pie_default=no
1766 build_pie_default=$libc_cv_pie_supported
1768 LIBC_CONFIG_VAR([build-pie-default], [$build_pie_default])
1770 AC_MSG_CHECKING(if we can build static PIE programs)
1771 libc_cv_static_pie_supported=$libc_cv_pie_supported
1772 if test "x$libc_cv_pie_supported" != xno \
1773 -a "$libc_cv_no_dynamic_linker" = yes; then
1774 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifndef SUPPORT_STATIC_PIE
1775 # error static PIE is not supported
1776 #endif]])], [libc_cv_static_pie_supported=yes],
1777 [libc_cv_static_pie_supported=no])
1779 AC_MSG_RESULT($libc_cv_static_pie_supported)
1781 # Enable static-pie only if it is available and glibc isn't configured
1782 # with --disable-default-pie.
1783 if test "x$default_pie" = xno; then
1784 libc_cv_static_pie=no
1786 libc_cv_static_pie=$libc_cv_static_pie_supported
1788 if test "$libc_cv_static_pie" = "yes"; then
1789 AC_DEFINE(ENABLE_STATIC_PIE)
1791 LIBC_CONFIG_VAR([enable-static-pie], [$libc_cv_static_pie])
1793 # Set the `multidir' variable by grabbing the variable from the compiler.
1794 # We do it once and save the result in a generated makefile.
1795 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1796 AC_SUBST(libc_cv_multidir)
1799 AC_SUBST(static_nss)
1803 dnl See sysdeps/mach/configure.ac for this variable.
1804 AC_SUBST(mach_interface_list)
1806 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1807 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1811 if test "$pthread_in_libc" = yes; then
1812 AC_DEFINE(PTHREAD_IN_LIBC)
1814 AC_SUBST(pthread_in_libc)
1816 AC_CONFIG_FILES([config.make Makefile])
1817 AC_CONFIG_COMMANDS([default],[[
1818 case $CONFIG_FILES in *config.make*)
1819 echo "$config_vars" >> config.make;;
1821 test -d bits || mkdir bits]],[[config_vars='$config_vars']])