| blob | ca1282a6b3f8c5369c133a47f5c8239c3f2d32b5 |
1 dnl Process this file with autoconf to produce a configure script.
2 dnl Note we do not use AC_PREREQ here! See aclocal.m4 for what we use instead.
3 AC_INIT([GNU C Library], [(see version.h)], [https://sourceware.org/bugzilla/], [glibc])
4 AC_CONFIG_SRCDIR([include/features.h])
5 AC_CONFIG_HEADERS([config.h])
6 AC_CONFIG_AUX_DIR([scripts])
8 ACX_PKGVERSION([GNU libc])
9 ACX_BUGURL([http://www.gnu.org/software/libc/bugs.html])
10 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
11 [Package description])
12 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
13 [Bug reporting address])
15 # Glibc should not depend on any header files
16 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
17 [m4_divert_text([DEFAULTS],
18 [ac_includes_default='/* none */'])])
20 # We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
21 # here to work around the Autoconf issue discussed in
22 # <https://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
23 AC_DEFUN([AC_PROG_CPP],
24 [AC_REQUIRE([AC_PROG_CC])dnl
25 AC_ARG_VAR([CPP], [C preprocessor])dnl
26 _AC_ARG_VAR_CPPFLAGS()dnl
27 # On Suns, sometimes $CPP names a directory.
28 if test -n "$CPP" && test -d "$CPP"; then
29 CPP=
30 fi
31 if test -z "$CPP"; then
32 CPP="$CC -E"
33 fi
34 AC_SUBST(CPP)dnl
35 ])# AC_PROG_CPP
37 # We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf
38 # issue discussed in
39 # <https://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
40 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
42 dnl This is here so we can set $subdirs directly based on configure fragments.
43 AC_CONFIG_SUBDIRS()
45 AC_CANONICAL_HOST
47 AC_PROG_CC
48 if test $host != $build; then
49 AC_CHECK_PROGS(BUILD_CC, gcc cc)
50 fi
51 AC_SUBST(cross_compiling)
52 AC_PROG_CPP
53 AC_CHECK_TOOL(READELF, readelf, false)
55 # We need the C++ compiler only for testing.
56 AC_PROG_CXX
57 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
58 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
59 AC_LANG_PUSH([C++])
60 # Default, dynamic case.
61 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
62 [libc_cv_cxx_link_ok=yes],
63 [libc_cv_cxx_link_ok=no])
64 # Static case.
65 old_LDFLAGS="$LDFLAGS"
66 LDFLAGS="$LDFLAGS -static"
67 AC_LINK_IFELSE([AC_LANG_SOURCE([
68 #include <iostream>
70 int
71 main()
72 {
73 std::cout << "Hello, world!";
74 return 0;
75 }
76 ])],
77 [],
78 [libc_cv_cxx_link_ok=no])
79 LDFLAGS="$old_LDFLAGS"
80 AC_LANG_POP([C++])])
81 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
83 if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
84 AC_MSG_ERROR([you must configure in a separate build directory])
85 fi
87 # This will get text that should go into config.make.
88 config_vars=
90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
91 AC_ARG_WITH([gd],
92 AC_HELP_STRING([--with-gd=DIR],
93 [find libgd include dir and library with prefix DIR]),
94 [dnl
95 case "$with_gd" in
96 yes|''|no) ;;
97 *) libgd_include="-I$withval/include"
98 libgd_ldflags="-L$withval/lib" ;;
99 esac
100 ])
101 AC_ARG_WITH([gd-include],
102 AC_HELP_STRING([--with-gd-include=DIR],
103 [find libgd include files in DIR]),
104 [dnl
105 case "$with_gd_include" in
106 ''|no) ;;
107 *) libgd_include="-I$withval" ;;
108 esac
109 ])
110 AC_ARG_WITH([gd-lib],
111 AC_HELP_STRING([--with-gd-lib=DIR],
112 [find libgd library files in DIR]),
113 [dnl
114 case "$with_gd_lib" in
115 ''|no) ;;
116 *) libgd_ldflags="-L$withval" ;;
117 esac
118 ])
120 if test -n "$libgd_include"; then
121 config_vars="$config_vars
122 CFLAGS-memusagestat.c = $libgd_include"
123 fi
124 if test -n "$libgd_ldflags"; then
125 config_vars="$config_vars
126 libgd-LDFLAGS = $libgd_ldflags"
127 fi
129 dnl Arguments to specify presence of other packages/features.
130 AC_ARG_WITH([binutils],
131 AC_HELP_STRING([--with-binutils=PATH],
132 [specify location of binutils (as and ld)]),
133 [path_binutils=$withval],
134 [path_binutils=''])
135 AC_ARG_WITH([selinux],
136 AC_HELP_STRING([--with-selinux],
137 [if building with SELinux support]),
138 [with_selinux=$withval],
139 [with_selinux=auto])
141 AC_ARG_WITH([headers],
142 AC_HELP_STRING([--with-headers=PATH],
143 [location of system headers to use
144 (for example /usr/src/linux/include)
145 @<:@default=compiler default@:>@]),
146 [sysheaders=$withval],
147 [sysheaders=''])
148 AC_SUBST(sysheaders)
150 AC_SUBST(use_default_link)
151 AC_ARG_WITH([default-link],
152 AC_HELP_STRING([--with-default-link],
153 [do not use explicit linker scripts]),
154 [use_default_link=$withval],
155 [use_default_link=default])
157 AC_ARG_ENABLE([sanity-checks],
158 AC_HELP_STRING([--disable-sanity-checks],
159 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
160 [enable_sanity=$enableval],
161 [enable_sanity=yes])
163 AC_ARG_ENABLE([shared],
164 AC_HELP_STRING([--enable-shared],
165 [build shared library @<:@default=yes if GNU ld@:>@]),
166 [shared=$enableval],
167 [shared=yes])
168 AC_ARG_ENABLE([profile],
169 AC_HELP_STRING([--enable-profile],
170 [build profiled library @<:@default=no@:>@]),
171 [profile=$enableval],
172 [profile=no])
173 AC_ARG_ENABLE([static-pie],
174 AC_HELP_STRING([--enable-static-pie],
175 [enable static PIE support and use it in the testsuite @<:@default=no@:>@]),
176 [static_pie=$enableval],
177 [static_pie=no])
178 AC_ARG_ENABLE([timezone-tools],
179 AC_HELP_STRING([--disable-timezone-tools],
180 [do not install timezone tools @<:@default=install@:>@]),
181 [enable_timezone_tools=$enableval],
182 [enable_timezone_tools=yes])
183 AC_SUBST(enable_timezone_tools)
185 AC_ARG_ENABLE([hardcoded-path-in-tests],
186 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
187 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
188 [hardcoded_path_in_tests=$enableval],
189 [hardcoded_path_in_tests=no])
190 AC_SUBST(hardcoded_path_in_tests)
192 AC_ARG_ENABLE([stackguard-randomization],
193 AC_HELP_STRING([--enable-stackguard-randomization],
194 [initialize __stack_chk_guard canary with a random number at program start]),
195 [enable_stackguard_randomize=$enableval],
196 [enable_stackguard_randomize=no])
197 if test "$enable_stackguard_randomize" = yes; then
198 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
199 fi
201 AC_ARG_ENABLE([hidden-plt],
202 AC_HELP_STRING([--disable-hidden-plt],
203 [do not hide internal function calls to avoid PLT]),
204 [hidden=$enableval],
205 [hidden=yes])
206 if test "x$hidden" = xno; then
207 AC_DEFINE(NO_HIDDEN)
208 fi
210 AC_ARG_ENABLE([bind-now],
211 AC_HELP_STRING([--enable-bind-now],
212 [disable lazy relocations in DSOs]),
213 [bindnow=$enableval],
214 [bindnow=no])
215 AC_SUBST(bindnow)
216 if test "x$bindnow" = xyes; then
217 AC_DEFINE(BIND_NOW)
218 fi
220 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
221 dnl -fstack-protector-strong.
222 AC_ARG_ENABLE([stack-protector],
223 AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
224 [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
225 [enable_stack_protector=$enableval],
226 [enable_stack_protector=no])
227 case "$enable_stack_protector" in
228 all|yes|no|strong) ;;
229 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
230 esac
232 dnl On some platforms we cannot use dynamic loading. We must provide
233 dnl static NSS modules.
234 AC_ARG_ENABLE([static-nss],
235 AC_HELP_STRING([--enable-static-nss],
236 [build static NSS modules @<:@default=no@:>@]),
237 [static_nss=$enableval],
238 [static_nss=no])
239 dnl Enable static NSS also if we build no shared objects.
240 if test x"$static_nss" = xyes || test x"$shared" = xno; then
241 static_nss=yes
242 AC_DEFINE(DO_STATIC_NSS)
243 fi
245 AC_ARG_ENABLE([force-install],
246 AC_HELP_STRING([--disable-force-install],
247 [don't force installation of files from this package, even if they are older than the installed files]),
248 [force_install=$enableval],
249 [force_install=yes])
250 AC_SUBST(force_install)
252 AC_ARG_ENABLE([maintainer-mode],
253 AC_HELP_STRING([--enable-maintainer-mode],
254 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
255 [maintainer=$enableval],
256 [maintainer=no])
258 dnl On some platforms we allow dropping compatibility with all kernel
259 dnl versions.
260 AC_ARG_ENABLE([kernel],
261 AC_HELP_STRING([--enable-kernel=VERSION],
262 [compile for compatibility with kernel not older than VERSION]),
263 [minimum_kernel=$enableval],
264 [])
265 dnl Prevent unreasonable values.
266 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
267 # Better nothing than this.
268 minimum_kernel=""
269 else
270 if test "$minimum_kernel" = current; then
271 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
272 fi
273 fi
275 dnl For the development we sometimes want gcc to issue even more warnings.
276 dnl This is not the default since many of the extra warnings are not
277 dnl appropriate.
278 AC_ARG_ENABLE([all-warnings],
279 AC_HELP_STRING([--enable-all-warnings],
280 [enable all useful warnings gcc can issue]),
281 [all_warnings=$enableval],
282 [])
283 AC_SUBST(all_warnings)
285 AC_ARG_ENABLE([werror],
286 AC_HELP_STRING([--disable-werror],
287 [do not build with -Werror]),
288 [enable_werror=$enableval],
289 [enable_werror=yes])
290 AC_SUBST(enable_werror)
292 AC_ARG_ENABLE([multi-arch],
293 AC_HELP_STRING([--enable-multi-arch],
294 [enable single DSO with optimizations for multiple architectures]),
295 [multi_arch=$enableval],
296 [multi_arch=default])
298 AC_ARG_ENABLE([experimental-malloc],
299 AC_HELP_STRING([--disable-experimental-malloc],
300 [disable experimental malloc features]),
301 [experimental_malloc=$enableval],
302 [experimental_malloc=yes])
303 AC_SUBST(experimental_malloc)
305 AC_ARG_ENABLE([nss-crypt],
306 AC_HELP_STRING([--enable-nss-crypt],
307 [enable libcrypt to use nss]),
308 [nss_crypt=$enableval],
309 [nss_crypt=no])
310 if test x$nss_crypt = xyes; then
311 nss_includes=-I$(nss-config --includedir 2>/dev/null)
312 if test $? -ne 0; then
313 AC_MSG_ERROR([cannot find include directory with nss-config])
314 fi
315 nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
316 if test $? -ne 0; then
317 AC_MSG_ERROR([cannot find include directory with nspr-config])
318 fi
319 old_CFLAGS="$CFLAGS"
320 CFLAGS="$CFLAGS $nss_includes $nspr_includes"
321 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
322 #include <hasht.h>
323 #include <nsslowhash.h>
324 void f (void) { NSSLOW_Init (); }])],
325 libc_cv_nss_crypt=yes,
326 AC_MSG_ERROR([
327 cannot find NSS headers with lowlevel hash function interfaces]))
328 old_LIBS="$LIBS"
329 old_LDFLAGS="$LDFLAGS"
330 LIBS="$LIBS -lfreebl3"
331 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
332 #include <hasht.h>
333 #include <nsslowhash.h>],
334 [NSSLOW_Init();])],
335 libc_cv_nss_crypt=yes,
336 AC_MSG_ERROR([
337 cannot link program using lowlevel NSS hash functions]))
338 # Check to see if there is a static NSS cryptographic library.
339 # If there isn't then we can't link anything with libcrypt.a,
340 # and that might mean disabling some static tests.
341 LDFLAGS="$LDFLAGS -static"
342 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
343 #include <hasht.h>
344 #include <nsslowhash.h>],
345 [NSSLOW_Init();])],
346 libc_cv_static_nss_crypt=yes,
347 libc_cv_static_nss_crypt=no)
348 LDFLAGS="$old_LDFLAGS"
349 CFLAGS="$old_CFLAGS"
350 LIBS="$old_LIBS"
351 else
352 libc_cv_nss_crypt=no
353 libc_cv_static_nss_crypt=no
354 fi
355 AC_SUBST(libc_cv_nss_crypt)
356 AC_SUBST(libc_cv_static_nss_crypt)
359 AC_ARG_ENABLE([obsolete-rpc],
360 AC_HELP_STRING([--enable-obsolete-rpc],
361 [build and install the obsolete RPC code for link-time usage]),
362 [link_obsolete_rpc=$enableval],
363 [link_obsolete_rpc=no])
364 AC_SUBST(link_obsolete_rpc)
366 if test "$link_obsolete_rpc" = yes; then
367 AC_DEFINE(LINK_OBSOLETE_RPC)
368 fi
370 AC_ARG_ENABLE([obsolete-nsl],
371 AC_HELP_STRING([--enable-obsolete-nsl],
372 [build and install the obsolete libnsl library and depending NSS modules]),
373 [build_obsolete_nsl=$enableval],
374 [build_obsolete_nsl=no])
375 AC_SUBST(build_obsolete_nsl)
377 if test "$build_obsolete_nsl" = yes; then
378 AC_DEFINE(LINK_OBSOLETE_NSL)
379 fi
381 AC_ARG_ENABLE([systemtap],
382 [AS_HELP_STRING([--enable-systemtap],
383 [enable systemtap static probe points @<:@default=no@:>@])],
384 [systemtap=$enableval],
385 [systemtap=no])
386 if test "x$systemtap" != xno; then
387 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
388 old_CFLAGS="$CFLAGS"
389 CFLAGS="-std=gnu11 $CFLAGS"
390 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
391 void foo (int i, void *p)
392 {
393 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
394 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
395 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
396 CFLAGS="$old_CFLAGS"])
397 if test $libc_cv_sdt = yes; then
398 AC_DEFINE([USE_STAP_PROBE])
399 elif test "x$systemtap" != xauto; then
400 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
401 fi
402 fi
404 AC_ARG_ENABLE([build-nscd],
405 [AS_HELP_STRING([--disable-build-nscd],
406 [disable building and installing the nscd daemon])],
407 [build_nscd=$enableval],
408 [build_nscd=default])
409 AC_SUBST(build_nscd)
411 # Note the use of $use_nscd is near the bottom of the file.
412 AC_ARG_ENABLE([nscd],
413 [AS_HELP_STRING([--disable-nscd],
414 [library functions will not contact the nscd daemon])],
415 [use_nscd=$enableval],
416 [use_nscd=yes])
418 AC_ARG_ENABLE([pt_chown],
419 [AS_HELP_STRING([--enable-pt_chown],
420 [Enable building and installing pt_chown])],
421 [build_pt_chown=$enableval],
422 [build_pt_chown=no])
423 AC_SUBST(build_pt_chown)
424 if test "$build_pt_chown" = yes; then
425 AC_DEFINE(HAVE_PT_CHOWN)
426 fi
428 AC_ARG_ENABLE([tunables],
429 [AS_HELP_STRING([--enable-tunables],
430 [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
431 [have_tunables=$enableval],
432 [have_tunables=yes])
433 AC_SUBST(have_tunables)
434 if test "$have_tunables" = yes; then
435 AC_DEFINE(HAVE_TUNABLES)
436 fi
438 # The abi-tags file uses a fairly simplistic model for name recognition that
439 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
440 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
441 # This doesn't get used much beyond that, so it's fairly safe.
442 case "$host_os" in
443 linux*)
444 ;;
445 gnu*)
446 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
447 ;;
448 esac
450 AC_ARG_ENABLE([mathvec],
451 [AS_HELP_STRING([--enable-mathvec],
452 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
453 [build_mathvec=$enableval],
454 [build_mathvec=notset])
456 # We keep the original values in `$config_*' and never modify them, so we
457 # can write them unchanged into config.make. Everything else uses
458 # $machine, $vendor, and $os, and changes them whenever convenient.
459 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
461 # Don't allow vendor == "unknown"
462 test "$config_vendor" = unknown && config_vendor=
463 config_os="`echo $config_os | sed 's/^unknown-//'`"
465 # Some configurations imply other options.
466 elf=yes
468 # The configure fragment of a port can modify these to supplement
469 # or override the table in the case statement below. No fragment should
470 # ever change the config_* variables, however.
471 machine=$config_machine
472 vendor=$config_vendor
473 os=$config_os
474 base_os=''
476 submachine=
477 AC_ARG_WITH([cpu],
478 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
479 [dnl
480 case "$withval" in
481 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
482 no) ;;
483 *) submachine="$withval" ;;
484 esac
485 ])
487 # An preconfigure script can set this when it wants to disable the sanity
488 # check below.
489 libc_config_ok=no
491 # A preconfigure script for a system that may or may not use fpu
492 # sysdeps directories sets this to a preprocessor conditional for
493 # whether to use such directories.
494 with_fp_cond=1
496 dnl Let sysdeps/*/preconfigure act here.
497 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
500 ###
501 ### By using the undocumented --enable-hacker-mode option for configure
502 ### one can skip this test to make the configuration not fail for unsupported
503 ### platforms.
504 ###
505 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
506 case "$machine-$host_os" in
507 *-linux* | *-gnu*)
508 ;;
509 *)
510 AC_MSG_ERROR([
511 *** The GNU C library is currently unavailable for this platform.
512 *** If you are interested in seeing glibc on this platform visit
513 *** the "How to submit a new port" in the wiki:
514 *** https://sourceware.org/glibc/wiki/#Development
515 *** and join the community!])
516 ;;
517 esac
518 fi
520 # Set base_machine if not set by a preconfigure fragment.
521 test -n "$base_machine" || base_machine=$machine
522 AC_SUBST(base_machine)
524 # Determine whether to use fpu or nofpu sysdeps directories.
525 AC_CACHE_CHECK([for use of fpu sysdeps directories],
526 libc_cv_with_fp, [dnl
527 cat > conftest.c <<EOF
528 #if $with_fp_cond
529 int dummy;
530 #else
531 # error "no hardware floating point"
532 #endif
533 EOF
534 libc_cv_with_fp=no
535 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
536 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
537 libc_cv_with_fp=yes
538 fi
539 rm -f conftest*])
540 AC_SUBST(libc_cv_with_fp)
542 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
543 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
544 [libc_cv_ssp=yes],
545 [libc_cv_ssp=no])
546 ])
548 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
549 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
550 [libc_cv_ssp_strong=yes],
551 [libc_cv_ssp_strong=no])
552 ])
554 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
555 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
556 [libc_cv_ssp_all=yes],
557 [libc_cv_ssp_all=no])
558 ])
560 stack_protector=
561 no_stack_protector=
562 if test "$libc_cv_ssp" = yes; then
563 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
564 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
565 fi
567 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
568 stack_protector="-fstack-protector"
569 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
570 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
571 stack_protector="-fstack-protector-all"
572 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
573 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
574 stack_protector="-fstack-protector-strong"
575 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
576 else
577 stack_protector="-fno-stack-protector"
578 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
579 fi
580 AC_SUBST(libc_cv_ssp)
581 AC_SUBST(stack_protector)
582 AC_SUBST(no_stack_protector)
584 if test -n "$stack_protector"; then
585 dnl Don't run configure tests with stack-protection on, to avoid problems with
586 dnl bootstrapping.
587 no_ssp=-fno-stack-protector
588 else
589 no_ssp=
591 if test "$enable_stack_protector" != no; then
592 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
593 fi
594 fi
596 # For the multi-arch option we need support in the assembler & linker.
597 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
598 libc_cv_ld_gnu_indirect_function, [dnl
599 cat > conftest.S <<EOF
600 .type foo,%gnu_indirect_function
601 foo:
602 .globl _start
603 _start:
604 .globl __start
605 __start:
606 .data
607 #ifdef _LP64
608 .quad foo
609 #else
610 .long foo
611 #endif
612 EOF
613 libc_cv_ld_gnu_indirect_function=no
614 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
615 -nostartfiles -nostdlib $no_ssp \
616 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
617 # Do a link to see if the backend supports IFUNC relocs.
618 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
619 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
620 libc_cv_ld_gnu_indirect_function=yes
621 }
622 fi
623 rm -f conftest*])
625 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
626 AC_CACHE_CHECK([for gcc attribute ifunc support],
627 libc_cv_gcc_indirect_function, [dnl
628 cat > conftest.c <<EOF
629 extern int func (int);
630 int used_func (int a)
631 {
632 return a;
633 }
634 static void *resolver ()
635 {
636 return &used_func;
637 }
638 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
639 EOF
640 libc_cv_gcc_indirect_function=no
641 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
642 2>&AS_MESSAGE_LOG_FD ; then
643 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
644 libc_cv_gcc_indirect_function=yes
645 fi
646 fi
647 rm -f conftest*])
649 # Check if gcc warns about alias for function with incompatible types.
650 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
651 libc_cv_gcc_incompatible_alias, [dnl
652 cat > conftest.c <<EOF
653 int __redirect_foo (const void *s, int c);
655 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
656 __typeof (__redirect_foo) *foo_impl (void)
657 {
658 return 0;
659 }
661 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
662 EOF
663 libc_cv_gcc_incompatible_alias=yes
664 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
665 libc_cv_gcc_incompatible_alias=no
666 fi
667 rm -f conftest*])
669 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
670 if test x"$multi_arch" = xyes; then
671 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
672 else
673 multi_arch=no
674 fi
675 fi
676 if test x"$libc_cv_gcc_indirect_function" != xyes; then
677 # GCC 8+ emits a warning for alias with incompatible types and it might
678 # fail to build ifunc resolvers aliases to either weak or internal
679 # symbols. Disables multiarch build in this case.
680 if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
681 AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
682 if test x"$multi_arch" = xyes; then
683 AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
684 fi
685 AC_MSG_WARN([Multi-arch is disabled.])
686 multi_arch=no
687 elif test x"$multi_arch" = xyes; then
688 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
689 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
690 fi
691 fi
692 multi_arch_d=
693 if test x"$multi_arch" != xno; then
694 multi_arch_d=/multiarch
695 fi
697 # Compute the list of sysdep directories for this configuration.
698 # This can take a while to compute.
699 sysdep_dir=$srcdir/sysdeps
700 AC_MSG_CHECKING(sysdep dirs)
701 dnl We need to use [ and ] for other purposes for a while now.
702 changequote(,)dnl
703 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
704 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
706 test "x$base_os" != x || case "$os" in
707 gnu*)
708 base_os=mach/hurd ;;
709 linux*)
710 base_os=unix/sysv ;;
711 esac
713 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
714 tail=$os
715 ostry=$os
716 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
717 ostry="$ostry /$o"
718 tail=$o
719 done
720 o=`echo $tail | sed 's/[0-9]*$//'`
721 if test $o != $tail; then
722 ostry="$ostry /$o"
723 fi
724 # For linux-gnu, try linux-gnu, then linux.
725 o=`echo $tail | sed 's/-.*$//'`
726 if test $o != $tail; then
727 ostry="$ostry /$o"
728 fi
730 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
731 base=
732 tail=$base_os
733 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
734 set $b
735 base="$base /$1"
736 tail="$2"
737 done
739 # For sparc/sparc32, try sparc/sparc32 and then sparc.
740 mach=
741 tail=$machine${submachine:+/$submachine}
742 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
743 set $m
744 # Prepend the machine's FPU directory unless --without-fp.
745 if test "$libc_cv_with_fp" = yes; then
746 maybe_fpu=/fpu
747 else
748 maybe_fpu=/nofpu
749 fi
750 # For each machine term, try it with and then without /multiarch.
751 for try_fpu in $maybe_fpu ''; do
752 for try_multi in $multi_arch_d ''; do
753 mach="$mach /$1$try_fpu$try_multi"
754 done
755 done
756 tail="$2"
757 done
759 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
760 changequote([,])dnl
762 # Find what sysdep directories exist.
763 sysnames=
764 for b in $base ''; do
765 for m0 in $mach ''; do
766 for v in /$vendor ''; do
767 test "$v" = / && continue
768 for o in /$ostry ''; do
769 test "$o" = / && continue
770 for m in $mach ''; do
771 try_suffix="$m0$b$v$o$m"
772 if test -n "$try_suffix"; then
773 try_srcdir="${srcdir}/"
774 try="sysdeps$try_suffix"
775 test -n "$enable_debug_configure" &&
776 echo "$0 [DEBUG]: try $try" >&2
777 if test -d "$try_srcdir$try"; then
778 sysnames="$sysnames $try"
779 { test -n "$o" || test -n "$b"; } && os_used=t
780 { test -n "$m" || test -n "$m0"; } && machine_used=t
781 case x${m0:-$m} in
782 x*/$submachine) submachine_used=t ;;
783 esac
784 fi
785 fi
786 done
787 done
788 done
789 done
790 done
792 # If the assembler supports gnu_indirect_function symbol type and the
793 # architecture supports multi-arch, we enable multi-arch by default.
794 case $sysnames in
795 *"$multi_arch_d"*)
796 ;;
797 *)
798 test x"$multi_arch" = xdefault && multi_arch=no
799 ;;
800 esac
801 if test x"$multi_arch" != xno; then
802 AC_DEFINE(USE_MULTIARCH)
803 fi
804 AC_SUBST(multi_arch)
806 if test -z "$os_used" && test "$os" != none; then
807 AC_MSG_ERROR(Operating system $os is not supported.)
808 fi
809 if test -z "$machine_used" && test "$machine" != none; then
810 AC_MSG_ERROR(The $machine is not supported.)
811 fi
812 if test -z "$submachine_used" && test -n "$submachine"; then
813 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
814 fi
815 AC_SUBST(submachine)
817 # We have now validated the configuration.
819 # Expand the list of system names into a full list of directories
820 # from each element's parent name and Implies file (if present).
821 set $sysnames
822 names=
823 while test $# -gt 0; do
824 name=$1
825 shift
827 case " $names " in *" $name "*)
828 # Already in the list.
829 continue
830 esac
832 # Report each name as we discover it, so there is no long pause in output.
833 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
835 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
837 case $name in
838 /*) xsrcdir= ;;
839 *) xsrcdir=$srcdir/ ;;
840 esac
841 test -n "$enable_debug_configure" &&
842 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
844 for implies_file in Implies Implies-before Implies-after; do
845 implies_type=`echo $implies_file | sed s/-/_/`
846 eval ${implies_type}=
847 if test -f $xsrcdir$name/$implies_file; then
848 # Collect more names from the `Implies' file (removing comments).
849 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
850 for x in $implied_candidate; do
851 found=no
852 if test -d $xsrcdir$name_base/$x; then
853 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
854 found=yes
855 fi
856 try="sysdeps/$x"
857 try_srcdir=$srcdir/
858 test -n "$enable_debug_configure" &&
859 echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
860 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
861 then
862 eval "${implies_type}=\"\$${implies_type} \$try\""
863 found=yes
864 fi
865 if test $found = no; then
866 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
867 fi
868 done
869 fi
870 done
872 # Add NAME to the list of names.
873 names="$names $name"
875 # Find the parent of NAME, using the empty string if it has none.
876 changequote(,)dnl
877 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
878 changequote([,])dnl
880 test -n "$enable_debug_configure" &&
881 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
882 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
884 # Add the names implied by NAME, and NAME's parent (if it has one), to
885 # the list of names to be processed (the argument list). We prepend the
886 # implied names to the list and append the parent. We want implied
887 # directories to come before further directories inferred from the
888 # configuration components; this ensures that for sysv4, unix/common
889 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
890 # after sysv4).
891 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
892 test -n "$sysnames" && set $sysnames
893 done
895 # Add the default directories.
896 default_sysnames="sysdeps/generic"
897 sysnames="$names $default_sysnames"
898 AC_SUBST(sysnames)
899 # The other names were emitted during the scan.
900 AC_MSG_RESULT($default_sysnames)
903 ### Locate tools.
905 AC_PROG_INSTALL
906 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
907 # The makefiles need to use a different form to find it in $srcdir.
908 INSTALL='\$(..)./scripts/install-sh -c'
909 fi
910 AC_PROG_LN_S
912 LIBC_PROG_BINUTILS
914 # Accept binutils 2.25 or newer.
915 AC_CHECK_PROG_VER(AS, $AS, --version,
916 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
917 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
918 AS=: critic_missing="$critic_missing as")
920 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
921 # Accept gold 1.14 or higher
922 AC_CHECK_PROG_VER(LD, $LD, --version,
923 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
924 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
925 LD=: critic_missing="$critic_missing GNU gold")
926 else
927 AC_CHECK_PROG_VER(LD, $LD, --version,
928 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
929 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
930 LD=: critic_missing="$critic_missing GNU ld")
931 fi
933 # These programs are version sensitive.
934 AC_CHECK_TOOL_PREFIX
935 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
936 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
937 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
939 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
940 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
941 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
942 MSGFMT=: aux_missing="$aux_missing msgfmt")
943 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
944 [GNU texinfo.* \([0-9][0-9.]*\)],
945 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
946 MAKEINFO=: aux_missing="$aux_missing makeinfo")
947 AC_CHECK_PROG_VER(SED, sed, --version,
948 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
949 [3.0[2-9]*|3.[1-9]*|[4-9]*],
950 SED=: aux_missing="$aux_missing sed")
951 AC_CHECK_PROG_VER(AWK, gawk, --version,
952 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
953 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
954 AC_CHECK_PROG_VER(BISON, bison, --version,
955 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
956 [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
958 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
959 AC_TRY_COMPILE([], [
960 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
961 #error insufficient compiler
962 #endif],
963 [libc_cv_compiler_ok=yes],
964 [libc_cv_compiler_ok=no])])
965 AS_IF([test $libc_cv_compiler_ok != yes],
966 [critic_missing="$critic_missing compiler"])
968 AC_CHECK_TOOL(NM, nm, false)
970 if test "x$maintainer" = "xyes"; then
971 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
972 case "x$AUTOCONF" in
973 xno|x|x:) AUTOCONF=no ;;
974 *)
975 AC_CACHE_CHECK(dnl
976 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
977 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
978 libc_cv_autoconf_works=yes
979 else
980 libc_cv_autoconf_works=no
981 fi])
982 test $libc_cv_autoconf_works = yes || AUTOCONF=no
983 ;;
984 esac
985 if test "x$AUTOCONF" = xno; then
986 aux_missing="$aux_missing autoconf"
987 fi
988 else
989 AUTOCONF=no
990 fi
992 # Check for python3 if available, or else python.
993 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
994 case "x$PYTHON_PROG" in
995 xno|x|x:) PYTHON_PROG=no ;;
996 *) ;;
997 esac
999 if test "x$PYTHON_PROG" = xno; then
1000 aux_missing="$aux_missing python"
1001 else
1002 PYTHON="$PYTHON_PROG -B"
1003 AC_SUBST(PYTHON)
1004 fi
1006 test -n "$critic_missing" && AC_MSG_ERROR([
1007 *** These critical programs are missing or too old:$critic_missing
1008 *** Check the INSTALL file for required versions.])
1010 test -n "$aux_missing" && AC_MSG_WARN([
1011 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1012 *** some features or tests will be disabled.
1013 *** Check the INSTALL file for required versions.])
1015 # if using special system headers, find out the compiler's sekrit
1016 # header directory and add that to the list. NOTE: Only does the right
1017 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1018 if test -n "$sysheaders"; then
1019 SYSINCLUDES=-nostdinc
1020 for d in include include-fixed; do
1021 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1022 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1023 done
1024 SYSINCLUDES="$SYSINCLUDES \
1025 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1026 if test -n "$CXX"; then
1027 CXX_SYSINCLUDES=
1028 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1029 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1030 test "x$cxxheaders" != x &&
1031 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1032 done
1033 fi
1034 fi
1035 AC_SUBST(SYSINCLUDES)
1036 AC_SUBST(CXX_SYSINCLUDES)
1038 # Obtain some C++ header file paths. This is used to make a local
1039 # copy of those headers in Makerules.
1040 if test -n "$CXX"; then
1041 find_cxx_header () {
1042 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1043 | sed -n "\,$1:,{s/:\$//;p}"
1044 }
1045 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1046 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1047 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1048 fi
1049 AC_SUBST(CXX_CSTDLIB_HEADER)
1050 AC_SUBST(CXX_CMATH_HEADER)
1051 AC_SUBST(CXX_BITS_STD_ABS_H)
1053 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1054 # since this would lead to problems installing/building glibc.
1055 # LD_LIBRARY_PATH contains the current directory if one of the following
1056 # is true:
1057 # - one of the terminals (":" and ";") is the first or last sign
1058 # - two terminals occur directly after each other
1059 # - the path contains an element with a dot in it
1060 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1061 changequote(,)dnl
1062 case ${LD_LIBRARY_PATH} in
1063 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1064 ld_library_path_setting="contains current directory"
1065 ;;
1066 *)
1067 ld_library_path_setting="ok"
1068 ;;
1069 esac
1070 changequote([,])dnl
1071 AC_MSG_RESULT($ld_library_path_setting)
1072 if test "$ld_library_path_setting" != "ok"; then
1073 AC_MSG_ERROR([
1074 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1075 *** building glibc. Please change the environment variable
1076 *** and run configure again.])
1077 fi
1079 AC_PATH_PROG(BASH_SHELL, bash, no)
1081 AC_PATH_PROG(PERL, perl, no)
1082 if test "$PERL" != no &&
1083 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1084 PERL=no
1085 fi
1086 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1087 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1089 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1090 cat > conftest.s <<EOF
1091 .text
1092 foo:
1093 .set glibc_conftest_frobozz,foo
1094 .globl glibc_conftest_frobozz
1095 EOF
1096 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1097 # (but it doesn't work), so we must do a linking check to be sure.
1098 cat > conftest1.c <<\EOF
1099 extern int glibc_conftest_frobozz;
1100 void _start() { glibc_conftest_frobozz = 1; }
1101 EOF
1102 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1103 -nostartfiles -nostdlib $no_ssp \
1104 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1105 libc_cv_asm_set_directive=yes
1106 else
1107 libc_cv_asm_set_directive=no
1108 fi
1109 rm -f conftest*])
1110 if test $libc_cv_asm_set_directive = yes; then
1111 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1112 fi
1114 AC_CACHE_CHECK(linker support for protected data symbol,
1115 libc_cv_protected_data,
1116 [cat > conftest.c <<EOF
1117 int bar __attribute__ ((visibility ("protected"))) = 1;
1118 EOF
1119 libc_cv_protected_data=no
1120 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1121 cat > conftest.c <<EOF
1122 extern int bar;
1123 int main (void) { return bar; }
1124 EOF
1125 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1126 libc_cv_protected_data=yes
1127 fi
1128 fi
1129 rm -f conftest.*
1130 ])
1131 AC_SUBST(libc_cv_protected_data)
1133 AC_CACHE_CHECK(linker support for INSERT in linker script,
1134 libc_cv_insert,
1135 [cat > conftest.c <<EOF
1136 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1137 int test (void) { return bar; }
1138 EOF
1139 cat > conftest.t <<EOF
1140 SECTIONS
1141 {
1142 .bar : { *(.bar) }
1143 }
1144 INSERT AFTER .rela.dyn;
1145 EOF
1146 libc_cv_insert=no
1147 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1148 libc_cv_insert=yes
1149 fi
1150 rm -f conftest.*
1151 ])
1152 AC_SUBST(libc_cv_insert)
1154 AC_CACHE_CHECK(for broken __attribute__((alias())),
1155 libc_cv_broken_alias_attribute,
1156 [cat > conftest.c <<EOF
1157 extern int foo (int x) __asm ("xyzzy");
1158 int bar (int x) { return x; }
1159 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1160 extern int dfoo;
1161 extern __typeof (dfoo) dfoo __asm ("abccb");
1162 int dfoo = 1;
1163 EOF
1164 libc_cv_broken_alias_attribute=yes
1165 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1166 if grep 'xyzzy' conftest.s >/dev/null &&
1167 grep 'abccb' conftest.s >/dev/null; then
1168 libc_cv_broken_alias_attribute=no
1169 fi
1170 fi
1171 rm -f conftest.c conftest.s
1172 ])
1173 if test $libc_cv_broken_alias_attribute = yes; then
1174 AC_MSG_ERROR(working alias attribute support required)
1175 fi
1177 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1178 libc_cv_have_sdata_section,
1179 [echo "int i;" > conftest.c
1180 libc_cv_have_sdata_section=no
1181 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1182 | grep '\.sdata' >/dev/null; then
1183 libc_cv_have_sdata_section=yes
1184 fi
1185 rm -f conftest.c conftest.so
1186 ])
1187 if test $libc_cv_have_sdata_section = yes; then
1188 AC_DEFINE(HAVE_SDATA_SECTION)
1189 fi
1191 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1192 libc_cv_ctors_header, [dnl
1193 libc_cv_ctors_header=yes
1194 LIBC_TRY_LINK_STATIC([
1195 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1196 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1197 ],
1198 [dnl
1199 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1200 { gsub(/\@<:@ */, "@<:@") }
1201 $2 == ".ctors" || $2 == ".dtors" {
1202 size = strtonum("0x" $6)
1203 align = strtonum("0x" $NF)
1204 seen@<:@$2@:>@ = 1
1205 stub@<:@$2@:>@ = size == align * 2
1206 }
1207 END {
1208 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1209 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1210 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1211 }
1212 '], [libc_cv_ctors_header=no])
1213 ], [dnl
1214 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1215 ])
1216 ])
1217 if test $libc_cv_ctors_header = no; then
1218 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1219 fi
1221 AC_CACHE_CHECK(for libunwind-support in compiler,
1222 libc_cv_cc_with_libunwind, [
1223 cat > conftest.c <<EOF
1224 int main (void) { return 0; }
1225 EOF
1226 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1227 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1228 libc_cv_cc_with_libunwind=yes
1229 else
1230 libc_cv_cc_with_libunwind=no
1231 fi
1232 rm -f conftest*])
1233 AC_SUBST(libc_cv_cc_with_libunwind)
1234 if test $libc_cv_cc_with_libunwind = yes; then
1235 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1236 fi
1238 ASFLAGS_config=
1239 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1240 libc_cv_as_noexecstack, [dnl
1241 cat > conftest.c <<EOF
1242 void foo (void) { }
1243 EOF
1244 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1245 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1246 && grep .note.GNU-stack conftest.s >/dev/null \
1247 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1248 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1249 then
1250 libc_cv_as_noexecstack=yes
1251 else
1252 libc_cv_as_noexecstack=no
1253 fi
1254 rm -f conftest*])
1255 if test $libc_cv_as_noexecstack = yes; then
1256 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1257 fi
1258 AC_SUBST(ASFLAGS_config)
1260 AC_CACHE_CHECK(for -z combreloc,
1261 libc_cv_z_combreloc, [dnl
1262 cat > conftest.c <<EOF
1263 extern int bar (int);
1264 extern int mumble;
1265 int foo (void) { return bar (mumble); }
1266 EOF
1267 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1268 -fPIC -shared $no_ssp -o conftest.so conftest.c
1269 -nostdlib -nostartfiles
1270 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1271 then
1272 dnl The following test is a bit weak. We must use a tool which can test
1273 dnl cross-platform since the gcc used can be a cross compiler. Without
1274 dnl introducing new options this is not easily doable. Instead use a tool
1275 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1276 dnl look for a section named .rel.dyn or .rela.dyn.
1277 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1278 libc_cv_z_combreloc=yes
1279 else
1280 libc_cv_z_combreloc=no
1281 fi
1282 else
1283 libc_cv_z_combreloc=no
1284 fi
1285 rm -f conftest*])
1286 if test "$libc_cv_z_combreloc" = yes; then
1287 AC_DEFINE(HAVE_Z_COMBRELOC)
1288 fi
1289 AC_SUBST(libc_cv_z_combreloc)
1291 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1292 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1293 AC_SUBST(libc_cv_z_execstack)
1295 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1296 [-Wl,--no-dynamic-linker],
1297 [libc_cv_no_dynamic_linker=yes],
1298 [libc_cv_no_dynamic_linker=no])
1299 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1301 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1302 LIBC_TRY_CC_OPTION([-static-pie],
1303 [libc_cv_static_pie=yes],
1304 [libc_cv_static_pie=no])
1305 ])
1306 LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
1308 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1309 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1310 ])
1312 AC_SUBST(libc_cv_fpie)
1314 AC_CACHE_CHECK(for --hash-style option,
1315 libc_cv_hashstyle, [dnl
1316 cat > conftest.c <<EOF
1317 int _start (void) { return 42; }
1318 EOF
1319 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1320 -fPIC -shared -o conftest.so conftest.c
1321 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1322 then
1323 libc_cv_hashstyle=yes
1324 else
1325 libc_cv_hashstyle=no
1326 fi
1327 rm -f conftest*])
1328 AC_SUBST(libc_cv_hashstyle)
1330 # The linker's default -shared behavior is good enough if it
1331 # does these things that our custom linker scripts ensure that
1332 # all allocated NOTE sections come first.
1333 if test "$use_default_link" = default; then
1334 AC_CACHE_CHECK([for sufficient default -shared layout],
1335 libc_cv_use_default_link, [dnl
1336 libc_cv_use_default_link=no
1337 cat > conftest.s <<\EOF
1338 .section .note.a,"a",%note
1339 .balign 4
1340 .long 4,4,9
1341 .string "GNU"
1342 .string "foo"
1343 .section .note.b,"a",%note
1344 .balign 4
1345 .long 4,4,9
1346 .string "GNU"
1347 .string "bar"
1348 EOF
1349 if AC_TRY_COMMAND([dnl
1350 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1351 ac_try=`$READELF -S conftest.so | sed -n \
1352 ['${x;p;}
1353 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1354 t a
1355 b
1356 : a
1357 H']`
1358 then
1359 libc_seen_a=no libc_seen_b=no
1360 set -- $ac_try
1361 while test $# -ge 2 -a "$1" = NOTE; do
1362 case "$2" in
1363 .note.a) libc_seen_a=yes ;;
1364 .note.b) libc_seen_b=yes ;;
1365 esac
1366 shift 2
1367 done
1368 case "$libc_seen_a$libc_seen_b" in
1369 yesyes)
1370 libc_cv_use_default_link=yes
1371 ;;
1372 *)
1373 echo >&AS_MESSAGE_LOG_FD "\
1374 $libc_seen_a$libc_seen_b from:
1375 $ac_try"
1376 ;;
1377 esac
1378 fi
1379 rm -f conftest*])
1380 use_default_link=$libc_cv_use_default_link
1381 fi
1383 AC_CACHE_CHECK(for GLOB_DAT reloc,
1384 libc_cv_has_glob_dat, [dnl
1385 cat > conftest.c <<EOF
1386 extern int mumble;
1387 int foo (void) { return mumble; }
1388 EOF
1389 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1390 -fPIC -shared -o conftest.so conftest.c
1391 -nostdlib -nostartfiles $no_ssp
1392 1>&AS_MESSAGE_LOG_FD])
1393 then
1394 dnl look for GLOB_DAT relocation.
1395 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1396 libc_cv_has_glob_dat=yes
1397 else
1398 libc_cv_has_glob_dat=no
1399 fi
1400 else
1401 libc_cv_has_glob_dat=no
1402 fi
1403 rm -f conftest*])
1404 AC_SUBST(libc_cv_has_glob_dat)
1406 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1407 if libc_cv_output_format=`
1408 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1409 then
1410 :
1411 else
1412 libc_cv_output_format=
1413 fi
1414 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1415 AC_SUBST(libc_cv_output_format)
1417 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1418 cat > conftest.c <<EOF
1419 int foo;
1420 EOF
1421 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1422 conftest.c 1>&AS_MESSAGE_LOG_FD])
1423 then
1424 libc_cv_fno_toplevel_reorder=yes
1425 else
1426 libc_cv_fno_toplevel_reorder=no
1427 fi
1428 rm -f conftest*])
1429 if test $libc_cv_fno_toplevel_reorder = yes; then
1430 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1431 else
1432 fno_unit_at_a_time=-fno-unit-at-a-time
1433 fi
1434 AC_SUBST(fno_unit_at_a_time)
1436 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1437 [dnl
1438 cat > conftest.c <<EOF
1439 __thread int i;
1440 void foo (void)
1441 {
1442 i = 10;
1443 }
1444 EOF
1445 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1446 conftest.c 1>&AS_MESSAGE_LOG_FD])
1447 then
1448 libc_cv_mtls_dialect_gnu2=yes
1449 else
1450 libc_cv_mtls_dialect_gnu2=no
1451 fi
1452 rm -f conftest*])
1453 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1454 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1456 AC_CACHE_CHECK(whether cc puts quotes around section names,
1457 libc_cv_have_section_quotes,
1458 [cat > conftest.c <<EOF
1459 static const int foo
1460 __attribute__ ((section ("bar"))) = 1;
1461 EOF
1462 if ${CC-cc} -S conftest.c -o conftest.s; then
1463 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1464 libc_cv_have_section_quotes=yes
1465 else
1466 libc_cv_have_section_quotes=no
1467 fi
1468 else
1469 libc_cv_have_section_quotes=unknown
1470 fi
1471 rm -f conftest.{c,s}
1472 ])
1473 if test $libc_cv_have_section_quotes = yes; then
1474 AC_DEFINE(HAVE_SECTION_QUOTES)
1475 fi
1477 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1478 cat > conftest.c <<\EOF
1479 void zero (void *x)
1480 {
1481 __builtin_memset (x, 0, 1000);
1482 }
1483 EOF
1484 dnl
1485 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1486 then
1487 libc_cv_gcc_builtin_memset=no
1488 else
1489 libc_cv_gcc_builtin_memset=yes
1490 fi
1491 rm -f conftest* ])
1492 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1493 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1494 fi
1496 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1497 cat > conftest.c <<\EOF
1498 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1499 char *foo (const char *a, const char *b)
1500 {
1501 return __builtin_strstr (a, b);
1502 }
1503 EOF
1504 dnl
1505 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1506 then
1507 libc_cv_gcc_builtin_redirection=yes
1508 else
1509 libc_cv_gcc_builtin_redirection=no
1510 fi
1511 rm -f conftest* ])
1512 if test "$libc_cv_gcc_builtin_redirection" = no; then
1513 AC_MSG_ERROR([support for the symbol redirection needed])
1514 fi
1516 dnl Determine how to disable generation of FMA instructions.
1517 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1518 libc_cv_cc_nofma, [dnl
1519 libc_cv_cc_nofma=
1520 for opt in -ffp-contract=off -mno-fused-madd; do
1521 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1522 done])
1523 AC_SUBST(libc_cv_cc_nofma)
1525 if test -n "$submachine"; then
1526 AC_CACHE_CHECK([for compiler option for CPU variant],
1527 libc_cv_cc_submachine, [dnl
1528 libc_cv_cc_submachine=no
1529 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1530 LIBC_TRY_CC_OPTION([$opt], [
1531 libc_cv_cc_submachine="$opt"
1532 break], [])
1533 done])
1534 if test "x$libc_cv_cc_submachine" = xno; then
1535 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1536 fi
1537 fi
1538 AC_SUBST(libc_cv_cc_submachine)
1540 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1541 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1542 cat > conftest.c <<EOF
1543 void
1544 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1545 foo (void) {}
1546 EOF
1547 libc_cv_cc_loop_to_function=no
1548 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1549 then
1550 libc_cv_cc_loop_to_function=yes
1551 fi
1552 rm -f conftest*])
1553 if test $libc_cv_cc_loop_to_function = yes; then
1554 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1555 fi
1556 AC_SUBST(libc_cv_cc_loop_to_function)
1558 dnl Check whether we have the gd library available.
1559 AC_MSG_CHECKING(for libgd)
1560 if test "$with_gd" != "no"; then
1561 old_CFLAGS="$CFLAGS"
1562 CFLAGS="$CFLAGS $libgd_include"
1563 old_LDFLAGS="$LDFLAGS"
1564 LDFLAGS="$LDFLAGS $libgd_ldflags"
1565 old_LIBS="$LIBS"
1566 LIBS="$LIBS -lgd -lpng -lz -lm"
1567 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1568 CFLAGS="$old_CFLAGS"
1569 LDFLAGS="$old_LDFLAGS"
1570 LIBS="$old_LIBS"
1571 else
1572 LIBGD=no
1573 fi
1574 AC_MSG_RESULT($LIBGD)
1575 AC_SUBST(LIBGD)
1577 # SELinux detection
1578 if test x$with_selinux = xno ; then
1579 have_selinux=no;
1580 else
1581 # See if we have the SELinux library
1582 AC_CHECK_LIB(selinux, is_selinux_enabled,
1583 have_selinux=yes, have_selinux=no)
1584 if test x$with_selinux = xyes ; then
1585 if test x$have_selinux = xno ; then
1586 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1587 fi
1588 fi
1589 fi
1590 # Check if we're building with SELinux support.
1591 if test "x$have_selinux" = xyes; then
1592 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1594 # See if we have the libaudit library
1595 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1596 have_libaudit=yes, have_libaudit=no)
1597 if test "x$have_libaudit" = xyes; then
1598 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1599 fi
1600 AC_SUBST(have_libaudit)
1602 # See if we have the libcap library
1603 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1604 if test "x$have_libcap" = xyes; then
1605 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1606 fi
1607 AC_SUBST(have_libcap)
1608 fi
1609 AC_SUBST(have_selinux)
1611 CPPUNDEFS=
1612 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1613 dnl Since we are building the implementations of the fortified functions here,
1614 dnl having the macro defined interacts very badly.
1615 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1616 [AC_TRY_COMPILE([], [
1617 #ifdef _FORTIFY_SOURCE
1618 # error bogon
1619 #endif],
1620 [libc_cv_predef_fortify_source=no],
1621 [libc_cv_predef_fortify_source=yes])])
1622 if test $libc_cv_predef_fortify_source = yes; then
1623 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1624 fi
1625 AC_SUBST(CPPUNDEFS)
1627 # Some linkers on some architectures support __ehdr_start but with
1628 # bugs. Make sure usage of it does not create relocations in the
1629 # output (as the linker should resolve them all for us).
1630 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1631 libc_cv_ehdr_start, [
1632 old_CFLAGS="$CFLAGS"
1633 old_LDFLAGS="$LDFLAGS"
1634 old_LIBS="$LIBS"
1635 CFLAGS="$CFLAGS -fPIC"
1636 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1637 LIBS=
1638 AC_LINK_IFELSE([AC_LANG_SOURCE([
1639 typedef struct {
1640 char foo;
1641 long val;
1642 } Ehdr;
1643 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1644 long ehdr (void) { return __ehdr_start.val; }
1645 ])],
1646 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1647 libc_cv_ehdr_start=broken
1648 else
1649 libc_cv_ehdr_start=yes
1650 fi], [libc_cv_ehdr_start=no])
1651 CFLAGS="$old_CFLAGS"
1652 LDFLAGS="$old_LDFLAGS"
1653 LIBS="$old_LIBS"
1654 ])
1655 if test "$libc_cv_ehdr_start" = yes; then
1656 AC_DEFINE([HAVE_EHDR_START])
1657 elif test "$libc_cv_ehdr_start" = broken; then
1658 AC_MSG_WARN([linker is broken -- you should upgrade])
1659 fi
1661 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1662 libc_cv_builtin_trap, [dnl
1663 libc_cv_builtin_trap=no
1664 AC_TRY_COMPILE([], [__builtin_trap ()], [
1665 libc_undefs=`$NM -u conftest.o |
1666 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1667 2>&AS_MESSAGE_LOG_FD` || {
1668 AC_MSG_ERROR([confusing output from $NM -u])
1669 }
1670 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1671 if test -z "$libc_undefs"; then
1672 libc_cv_builtin_trap=yes
1673 fi])])
1674 if test $libc_cv_builtin_trap = yes; then
1675 AC_DEFINE([HAVE_BUILTIN_TRAP])
1676 fi
1678 dnl C++ feature tests.
1679 AC_LANG_PUSH([C++])
1681 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1682 libc_cv_cxx_thread_local, [
1683 old_CXXFLAGS="$CXXFLAGS"
1684 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1685 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1686 #include <thread>
1688 // Compiler support.
1689 struct S
1690 {
1691 S ();
1692 ~S ();
1693 };
1694 thread_local S s;
1695 S * get () { return &s; }
1697 // libstdc++ support.
1698 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1699 #error __cxa_thread_atexit_impl not supported
1700 #endif
1701 ])],
1702 [libc_cv_cxx_thread_local=yes],
1703 [libc_cv_cxx_thread_local=no])
1704 CXXFLAGS="$old_CXXFLAGS"
1705 ])
1706 AC_SUBST(libc_cv_cxx_thread_local)
1708 AC_LANG_POP([C++])
1709 dnl End of C++ feature tests.
1711 ### End of automated tests.
1712 ### Now run sysdeps configure fragments.
1714 # They also can set these variables.
1715 use_ldconfig=no
1716 ldd_rewrite_script=no
1717 libc_cv_sysconfdir=$sysconfdir
1718 libc_cv_localstatedir=$localstatedir
1719 libc_cv_gcc_unwind_find_fde=no
1720 libc_cv_idn=no
1722 # Iterate over all the sysdep directories we will use, running their
1723 # configure fragments.
1724 for dir in $sysnames; do
1725 case $dir in
1726 /*) dest=$dir ;;
1727 *) dest=$srcdir/$dir ;;
1728 esac
1729 if test -r $dest/configure; then
1730 AC_MSG_RESULT(running configure fragment for $dir)
1731 . $dest/configure
1732 fi
1733 done
1735 if test x"$build_mathvec" = xnotset; then
1736 build_mathvec=no
1737 fi
1738 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1740 AC_SUBST(libc_extra_cflags)
1741 AC_SUBST(libc_extra_cppflags)
1743 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1744 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1745 fi
1746 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1748 # A sysdeps configure fragment can reset this if IFUNC is not actually
1749 # usable even though the assembler knows how to generate the symbol type.
1750 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1751 AC_DEFINE(HAVE_IFUNC)
1752 fi
1754 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1755 AC_DEFINE(HAVE_GCC_IFUNC)
1756 fi
1758 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1759 # configure fragment can override the value to prevent this AC_DEFINE.
1760 AC_SUBST(use_nscd)
1761 if test "x$use_nscd" != xno; then
1762 AC_DEFINE([USE_NSCD])
1763 fi
1764 if test "x$build_nscd" = xdefault; then
1765 build_nscd=$use_nscd
1766 fi
1768 AC_SUBST(libc_cv_slibdir)
1769 AC_SUBST(libc_cv_rtlddir)
1770 AC_SUBST(libc_cv_complocaledir)
1771 AC_SUBST(libc_cv_sysconfdir)
1772 AC_SUBST(libc_cv_localstatedir)
1773 AC_SUBST(libc_cv_rootsbindir)
1775 if test x$use_ldconfig = xyes; then
1776 AC_DEFINE(USE_LDCONFIG)
1777 fi
1778 AC_SUBST(use_ldconfig)
1779 AC_SUBST(ldd_rewrite_script)
1781 AC_SUBST(static)
1782 AC_SUBST(shared)
1784 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1785 [libc_cv_pic_default=yes
1786 cat > conftest.c <<EOF
1787 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1788 # error PIC is default.
1789 #endif
1790 EOF
1791 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1792 libc_cv_pic_default=no
1793 fi
1794 rm -f conftest.*])
1795 AC_SUBST(libc_cv_pic_default)
1797 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1798 [libc_cv_cc_pie_default=yes
1799 cat > conftest.c <<EOF
1800 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1801 # error PIE is default.
1802 #endif
1803 EOF
1804 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1805 libc_cv_cc_pie_default=no
1806 fi
1807 rm -f conftest.*])
1808 libc_cv_pie_default=$libc_cv_cc_pie_default
1809 AC_SUBST(libc_cv_cc_pie_default)
1810 AC_SUBST(libc_cv_pie_default)
1812 # Set the `multidir' variable by grabbing the variable from the compiler.
1813 # We do it once and save the result in a generated makefile.
1814 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1815 AC_SUBST(libc_cv_multidir)
1817 if test "$static_pie" = yes; then
1818 # The linker must support --no-dynamic-linker.
1819 if test "$libc_cv_no_dynamic_linker" != yes; then
1820 AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1821 fi
1822 # Default to PIE.
1823 libc_cv_pie_default=yes
1824 AC_DEFINE(ENABLE_STATIC_PIE)
1825 fi
1826 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1828 AC_SUBST(profile)
1829 AC_SUBST(static_nss)
1831 AC_SUBST(DEFINES)
1833 dnl See sysdeps/mach/configure.ac for this variable.
1834 AC_SUBST(mach_interface_list)
1836 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1837 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1838 AC_SUBST(VERSION)
1839 AC_SUBST(RELEASE)
1841 AC_CONFIG_FILES([config.make Makefile])
1842 AC_CONFIG_COMMANDS([default],[[
1843 case $CONFIG_FILES in *config.make*)
1844 echo "$config_vars" >> config.make;;
1845 esac
1846 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1847 AC_OUTPUT