| blob | 014e09a5d58d102d208ddfaa192d844b1792d94f |
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=$enableval],
302 [experimental_malloc=yes])
303 AC_SUBST(experimental_malloc)
305 AC_ARG_ENABLE([crypt],
306 AC_HELP_STRING([--disable-crypt],
307 [do not build nor install the passphrase hashing library, libcrypt]),
308 [build_crypt=$enableval],
309 [build_crypt=yes])
310 AC_SUBST(build_crypt)
312 AC_ARG_ENABLE([nss-crypt],
313 AC_HELP_STRING([--enable-nss-crypt],
314 [enable libcrypt to use nss]),
315 [nss_crypt=$enableval],
316 [nss_crypt=no])
317 if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
318 AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
319 nss_crypt=no
320 fi
321 if test x$nss_crypt = xyes; then
322 nss_includes=-I$(nss-config --includedir 2>/dev/null)
323 if test $? -ne 0; then
324 AC_MSG_ERROR([cannot find include directory with nss-config])
325 fi
326 nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
327 if test $? -ne 0; then
328 AC_MSG_ERROR([cannot find include directory with nspr-config])
329 fi
330 old_CFLAGS="$CFLAGS"
331 CFLAGS="$CFLAGS $nss_includes $nspr_includes"
332 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
333 #include <hasht.h>
334 #include <nsslowhash.h>
335 void f (void) { NSSLOW_Init (); }])],
336 libc_cv_nss_crypt=yes,
337 AC_MSG_ERROR([
338 cannot find NSS headers with lowlevel hash function interfaces]))
339 old_LIBS="$LIBS"
340 old_LDFLAGS="$LDFLAGS"
341 LIBS="$LIBS -lfreebl3"
342 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
343 #include <hasht.h>
344 #include <nsslowhash.h>],
345 [NSSLOW_Init();])],
346 libc_cv_nss_crypt=yes,
347 AC_MSG_ERROR([
348 cannot link program using lowlevel NSS hash functions]))
349 # Check to see if there is a static NSS cryptographic library.
350 # If there isn't then we can't link anything with libcrypt.a,
351 # and that might mean disabling some static tests.
352 LDFLAGS="$LDFLAGS -static"
353 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
354 #include <hasht.h>
355 #include <nsslowhash.h>],
356 [NSSLOW_Init();])],
357 libc_cv_static_nss_crypt=yes,
358 libc_cv_static_nss_crypt=no)
359 LDFLAGS="$old_LDFLAGS"
360 CFLAGS="$old_CFLAGS"
361 LIBS="$old_LIBS"
362 else
363 libc_cv_nss_crypt=no
364 libc_cv_static_nss_crypt=no
365 fi
366 AC_SUBST(libc_cv_nss_crypt)
367 AC_SUBST(libc_cv_static_nss_crypt)
370 AC_ARG_ENABLE([obsolete-rpc],
371 AC_HELP_STRING([--enable-obsolete-rpc],
372 [build and install the obsolete RPC code for link-time usage]),
373 [link_obsolete_rpc=$enableval],
374 [link_obsolete_rpc=no])
375 AC_SUBST(link_obsolete_rpc)
377 if test "$link_obsolete_rpc" = yes; then
378 AC_DEFINE(LINK_OBSOLETE_RPC)
379 fi
381 AC_ARG_ENABLE([obsolete-nsl],
382 AC_HELP_STRING([--enable-obsolete-nsl],
383 [build and install the obsolete libnsl library and depending NSS modules]),
384 [build_obsolete_nsl=$enableval],
385 [build_obsolete_nsl=no])
386 AC_SUBST(build_obsolete_nsl)
388 if test "$build_obsolete_nsl" = yes; then
389 AC_DEFINE(LINK_OBSOLETE_NSL)
390 fi
392 AC_ARG_ENABLE([systemtap],
393 [AS_HELP_STRING([--enable-systemtap],
394 [enable systemtap static probe points @<:@default=no@:>@])],
395 [systemtap=$enableval],
396 [systemtap=no])
397 if test "x$systemtap" != xno; then
398 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
399 old_CFLAGS="$CFLAGS"
400 CFLAGS="-std=gnu11 $CFLAGS"
401 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
402 void foo (int i, void *p)
403 {
404 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
405 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
406 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
407 CFLAGS="$old_CFLAGS"])
408 if test $libc_cv_sdt = yes; then
409 AC_DEFINE([USE_STAP_PROBE])
410 elif test "x$systemtap" != xauto; then
411 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
412 fi
413 fi
415 AC_ARG_ENABLE([build-nscd],
416 [AS_HELP_STRING([--disable-build-nscd],
417 [disable building and installing the nscd daemon])],
418 [build_nscd=$enableval],
419 [build_nscd=default])
420 AC_SUBST(build_nscd)
422 # Note the use of $use_nscd is near the bottom of the file.
423 AC_ARG_ENABLE([nscd],
424 [AS_HELP_STRING([--disable-nscd],
425 [library functions will not contact the nscd daemon])],
426 [use_nscd=$enableval],
427 [use_nscd=yes])
429 AC_ARG_ENABLE([pt_chown],
430 [AS_HELP_STRING([--enable-pt_chown],
431 [Enable building and installing pt_chown])],
432 [build_pt_chown=$enableval],
433 [build_pt_chown=no])
434 AC_SUBST(build_pt_chown)
435 if test "$build_pt_chown" = yes; then
436 AC_DEFINE(HAVE_PT_CHOWN)
437 fi
439 AC_ARG_ENABLE([tunables],
440 [AS_HELP_STRING([--enable-tunables],
441 [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
442 [have_tunables=$enableval],
443 [have_tunables=yes])
444 AC_SUBST(have_tunables)
445 if test "$have_tunables" = yes; then
446 AC_DEFINE(HAVE_TUNABLES)
447 fi
449 # The abi-tags file uses a fairly simplistic model for name recognition that
450 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
451 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
452 # This doesn't get used much beyond that, so it's fairly safe.
453 case "$host_os" in
454 linux*)
455 ;;
456 gnu*)
457 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
458 ;;
459 esac
461 AC_ARG_ENABLE([mathvec],
462 [AS_HELP_STRING([--enable-mathvec],
463 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
464 [build_mathvec=$enableval],
465 [build_mathvec=notset])
467 AC_ARG_ENABLE([cet],
468 AC_HELP_STRING([--enable-cet],
469 [enable Intel Control-flow Enforcement Technology (CET), x86 only]),
470 [enable_cet=$enableval],
471 [enable_cet=no])
473 # We keep the original values in `$config_*' and never modify them, so we
474 # can write them unchanged into config.make. Everything else uses
475 # $machine, $vendor, and $os, and changes them whenever convenient.
476 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
478 # Don't allow vendor == "unknown"
479 test "$config_vendor" = unknown && config_vendor=
480 config_os="`echo $config_os | sed 's/^unknown-//'`"
482 # Some configurations imply other options.
483 elf=yes
485 # The configure fragment of a port can modify these to supplement
486 # or override the table in the case statement below. No fragment should
487 # ever change the config_* variables, however.
488 machine=$config_machine
489 vendor=$config_vendor
490 os=$config_os
491 base_os=''
493 submachine=
494 AC_ARG_WITH([cpu],
495 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
496 [dnl
497 case "$withval" in
498 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
499 no) ;;
500 *) submachine="$withval" ;;
501 esac
502 ])
504 # An preconfigure script can set this when it wants to disable the sanity
505 # check below.
506 libc_config_ok=no
508 # A preconfigure script for a system that may or may not use fpu
509 # sysdeps directories sets this to a preprocessor conditional for
510 # whether to use such directories.
511 with_fp_cond=1
513 dnl Let sysdeps/*/preconfigure act here.
514 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
517 ###
518 ### By using the undocumented --enable-hacker-mode option for configure
519 ### one can skip this test to make the configuration not fail for unsupported
520 ### platforms.
521 ###
522 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
523 case "$machine-$host_os" in
524 *-linux* | *-gnu*)
525 ;;
526 *)
527 AC_MSG_ERROR([
528 *** The GNU C library is currently unavailable for this platform.
529 *** If you are interested in seeing glibc on this platform visit
530 *** the "How to submit a new port" in the wiki:
531 *** https://sourceware.org/glibc/wiki/#Development
532 *** and join the community!])
533 ;;
534 esac
535 fi
537 # Set base_machine if not set by a preconfigure fragment.
538 test -n "$base_machine" || base_machine=$machine
539 AC_SUBST(base_machine)
541 # Determine whether to use fpu or nofpu sysdeps directories.
542 AC_CACHE_CHECK([for use of fpu sysdeps directories],
543 libc_cv_with_fp, [dnl
544 cat > conftest.c <<EOF
545 #if $with_fp_cond
546 int dummy;
547 #else
548 # error "no hardware floating point"
549 #endif
550 EOF
551 libc_cv_with_fp=no
552 if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
553 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
554 libc_cv_with_fp=yes
555 fi
556 rm -f conftest*])
557 AC_SUBST(libc_cv_with_fp)
559 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
560 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
561 [libc_cv_ssp=yes],
562 [libc_cv_ssp=no])
563 ])
565 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
566 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
567 [libc_cv_ssp_strong=yes],
568 [libc_cv_ssp_strong=no])
569 ])
571 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
572 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
573 [libc_cv_ssp_all=yes],
574 [libc_cv_ssp_all=no])
575 ])
577 stack_protector=
578 no_stack_protector=
579 if test "$libc_cv_ssp" = yes; then
580 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
581 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
582 fi
584 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
585 stack_protector="-fstack-protector"
586 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
587 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
588 stack_protector="-fstack-protector-all"
589 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
590 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
591 stack_protector="-fstack-protector-strong"
592 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
593 else
594 stack_protector="-fno-stack-protector"
595 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
596 fi
597 AC_SUBST(libc_cv_ssp)
598 AC_SUBST(stack_protector)
599 AC_SUBST(no_stack_protector)
601 if test -n "$stack_protector"; then
602 dnl Don't run configure tests with stack-protection on, to avoid problems with
603 dnl bootstrapping.
604 no_ssp=-fno-stack-protector
605 else
606 no_ssp=
608 if test "$enable_stack_protector" != no; then
609 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
610 fi
611 fi
613 # For the multi-arch option we need support in the assembler & linker.
614 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
615 libc_cv_ld_gnu_indirect_function, [dnl
616 cat > conftest.S <<EOF
617 .type foo,%gnu_indirect_function
618 foo:
619 .globl _start
620 _start:
621 .globl __start
622 __start:
623 .data
624 #ifdef _LP64
625 .quad foo
626 #else
627 .long foo
628 #endif
629 EOF
630 libc_cv_ld_gnu_indirect_function=no
631 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
632 -nostartfiles -nostdlib $no_ssp \
633 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
634 # Do a link to see if the backend supports IFUNC relocs.
635 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
636 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
637 libc_cv_ld_gnu_indirect_function=yes
638 }
639 fi
640 rm -f conftest*])
642 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
643 AC_CACHE_CHECK([for gcc attribute ifunc support],
644 libc_cv_gcc_indirect_function, [dnl
645 cat > conftest.c <<EOF
646 extern int func (int);
647 int used_func (int a)
648 {
649 return a;
650 }
651 static void *resolver ()
652 {
653 return &used_func;
654 }
655 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
656 EOF
657 libc_cv_gcc_indirect_function=no
658 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
659 2>&AS_MESSAGE_LOG_FD ; then
660 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
661 libc_cv_gcc_indirect_function=yes
662 fi
663 fi
664 rm -f conftest*])
666 # Check if gcc warns about alias for function with incompatible types.
667 AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
668 libc_cv_gcc_incompatible_alias, [dnl
669 cat > conftest.c <<EOF
670 int __redirect_foo (const void *s, int c);
672 __typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
673 __typeof (__redirect_foo) *foo_impl (void)
674 {
675 return 0;
676 }
678 extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
679 EOF
680 libc_cv_gcc_incompatible_alias=yes
681 if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
682 libc_cv_gcc_incompatible_alias=no
683 fi
684 rm -f conftest*])
686 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
687 if test x"$multi_arch" = xyes; then
688 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
689 else
690 multi_arch=no
691 fi
692 fi
693 if test x"$libc_cv_gcc_indirect_function" != xyes; then
694 # GCC 8+ emits a warning for alias with incompatible types and it might
695 # fail to build ifunc resolvers aliases to either weak or internal
696 # symbols. Disables multiarch build in this case.
697 if test x"$libc_cv_gcc_incompatible_alias" == xyes; then
698 AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
699 if test x"$multi_arch" = xyes; then
700 AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
701 fi
702 AC_MSG_WARN([Multi-arch is disabled.])
703 multi_arch=no
704 elif test x"$multi_arch" = xyes; then
705 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
706 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
707 fi
708 fi
709 multi_arch_d=
710 if test x"$multi_arch" != xno; then
711 multi_arch_d=/multiarch
712 fi
714 # Compute the list of sysdep directories for this configuration.
715 # This can take a while to compute.
716 sysdep_dir=$srcdir/sysdeps
717 AC_MSG_CHECKING(sysdep dirs)
718 dnl We need to use [ and ] for other purposes for a while now.
719 changequote(,)dnl
720 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
721 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
723 test "x$base_os" != x || case "$os" in
724 gnu*)
725 base_os=mach/hurd ;;
726 linux*)
727 base_os=unix/sysv ;;
728 esac
730 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
731 tail=$os
732 ostry=$os
733 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
734 ostry="$ostry /$o"
735 tail=$o
736 done
737 o=`echo $tail | sed 's/[0-9]*$//'`
738 if test $o != $tail; then
739 ostry="$ostry /$o"
740 fi
741 # For linux-gnu, try linux-gnu, then linux.
742 o=`echo $tail | sed 's/-.*$//'`
743 if test $o != $tail; then
744 ostry="$ostry /$o"
745 fi
747 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
748 base=
749 tail=$base_os
750 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
751 set $b
752 base="$base /$1"
753 tail="$2"
754 done
756 # For sparc/sparc32, try sparc/sparc32 and then sparc.
757 mach=
758 tail=$machine${submachine:+/$submachine}
759 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
760 set $m
761 # Prepend the machine's FPU directory unless --without-fp.
762 if test "$libc_cv_with_fp" = yes; then
763 maybe_fpu=/fpu
764 else
765 maybe_fpu=/nofpu
766 fi
767 # For each machine term, try it with and then without /multiarch.
768 for try_fpu in $maybe_fpu ''; do
769 for try_multi in $multi_arch_d ''; do
770 mach="$mach /$1$try_fpu$try_multi"
771 done
772 done
773 tail="$2"
774 done
776 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
777 changequote([,])dnl
779 # Find what sysdep directories exist.
780 sysnames=
781 for b in $base ''; do
782 for m0 in $mach ''; do
783 for v in /$vendor ''; do
784 test "$v" = / && continue
785 for o in /$ostry ''; do
786 test "$o" = / && continue
787 for m in $mach ''; do
788 try_suffix="$m0$b$v$o$m"
789 if test -n "$try_suffix"; then
790 try_srcdir="${srcdir}/"
791 try="sysdeps$try_suffix"
792 test -n "$enable_debug_configure" &&
793 echo "$0 [DEBUG]: try $try" >&2
794 if test -d "$try_srcdir$try"; then
795 sysnames="$sysnames $try"
796 { test -n "$o" || test -n "$b"; } && os_used=t
797 { test -n "$m" || test -n "$m0"; } && machine_used=t
798 case x${m0:-$m} in
799 x*/$submachine) submachine_used=t ;;
800 esac
801 fi
802 fi
803 done
804 done
805 done
806 done
807 done
809 # If the assembler supports gnu_indirect_function symbol type and the
810 # architecture supports multi-arch, we enable multi-arch by default.
811 case $sysnames in
812 *"$multi_arch_d"*)
813 ;;
814 *)
815 test x"$multi_arch" = xdefault && multi_arch=no
816 ;;
817 esac
818 if test x"$multi_arch" != xno; then
819 AC_DEFINE(USE_MULTIARCH)
820 fi
821 AC_SUBST(multi_arch)
823 if test -z "$os_used" && test "$os" != none; then
824 AC_MSG_ERROR(Operating system $os is not supported.)
825 fi
826 if test -z "$machine_used" && test "$machine" != none; then
827 AC_MSG_ERROR(The $machine is not supported.)
828 fi
829 if test -z "$submachine_used" && test -n "$submachine"; then
830 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
831 fi
832 AC_SUBST(submachine)
834 # We have now validated the configuration.
836 # Expand the list of system names into a full list of directories
837 # from each element's parent name and Implies file (if present).
838 set $sysnames
839 names=
840 while test $# -gt 0; do
841 name=$1
842 shift
844 case " $names " in *" $name "*)
845 # Already in the list.
846 continue
847 esac
849 # Report each name as we discover it, so there is no long pause in output.
850 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
852 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
854 case $name in
855 /*) xsrcdir= ;;
856 *) xsrcdir=$srcdir/ ;;
857 esac
858 test -n "$enable_debug_configure" &&
859 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
861 for implies_file in Implies Implies-before Implies-after; do
862 implies_type=`echo $implies_file | sed s/-/_/`
863 eval ${implies_type}=
864 if test -f $xsrcdir$name/$implies_file; then
865 # Collect more names from the `Implies' file (removing comments).
866 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
867 for x in $implied_candidate; do
868 found=no
869 if test -d $xsrcdir$name_base/$x; then
870 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
871 found=yes
872 fi
873 try="sysdeps/$x"
874 try_srcdir=$srcdir/
875 test -n "$enable_debug_configure" &&
876 echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
877 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
878 then
879 eval "${implies_type}=\"\$${implies_type} \$try\""
880 found=yes
881 fi
882 if test $found = no; then
883 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
884 fi
885 done
886 fi
887 done
889 # Add NAME to the list of names.
890 names="$names $name"
892 # Find the parent of NAME, using the empty string if it has none.
893 changequote(,)dnl
894 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
895 changequote([,])dnl
897 test -n "$enable_debug_configure" &&
898 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
899 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
901 # Add the names implied by NAME, and NAME's parent (if it has one), to
902 # the list of names to be processed (the argument list). We prepend the
903 # implied names to the list and append the parent. We want implied
904 # directories to come before further directories inferred from the
905 # configuration components; this ensures that for sysv4, unix/common
906 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
907 # after sysv4).
908 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
909 test -n "$sysnames" && set $sysnames
910 done
912 # Add the default directories.
913 default_sysnames="sysdeps/generic"
914 sysnames="$names $default_sysnames"
915 AC_SUBST(sysnames)
916 # The other names were emitted during the scan.
917 AC_MSG_RESULT($default_sysnames)
920 ### Locate tools.
922 AC_PROG_INSTALL
923 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
924 # The makefiles need to use a different form to find it in $srcdir.
925 INSTALL='\$(..)./scripts/install-sh -c'
926 fi
927 AC_PROG_LN_S
929 LIBC_PROG_BINUTILS
931 # Accept binutils 2.25 or newer.
932 AC_CHECK_PROG_VER(AS, $AS, --version,
933 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
934 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
935 AS=: critic_missing="$critic_missing as")
937 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
938 # Accept gold 1.14 or higher
939 AC_CHECK_PROG_VER(LD, $LD, --version,
940 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
941 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
942 LD=: critic_missing="$critic_missing GNU gold")
943 else
944 AC_CHECK_PROG_VER(LD, $LD, --version,
945 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
946 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
947 LD=: critic_missing="$critic_missing GNU ld")
948 fi
950 # These programs are version sensitive.
951 AC_CHECK_TOOL_PREFIX
952 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
953 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
954 [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
956 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
957 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
958 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
959 MSGFMT=: aux_missing="$aux_missing msgfmt")
960 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
961 [GNU texinfo.* \([0-9][0-9.]*\)],
962 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
963 MAKEINFO=: aux_missing="$aux_missing makeinfo")
964 AC_CHECK_PROG_VER(SED, sed, --version,
965 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
966 [3.0[2-9]*|3.[1-9]*|[4-9]*],
967 SED=: aux_missing="$aux_missing sed")
968 AC_CHECK_PROG_VER(AWK, gawk, --version,
969 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
970 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
971 AC_CHECK_PROG_VER(BISON, bison, --version,
972 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
973 [2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
975 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
976 AC_TRY_COMPILE([], [
977 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
978 #error insufficient compiler
979 #endif],
980 [libc_cv_compiler_ok=yes],
981 [libc_cv_compiler_ok=no])])
982 AS_IF([test $libc_cv_compiler_ok != yes],
983 [critic_missing="$critic_missing compiler"])
985 AC_CHECK_TOOL(NM, nm, false)
987 if test "x$maintainer" = "xyes"; then
988 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
989 case "x$AUTOCONF" in
990 xno|x|x:) AUTOCONF=no ;;
991 *)
992 AC_CACHE_CHECK(dnl
993 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
994 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
995 libc_cv_autoconf_works=yes
996 else
997 libc_cv_autoconf_works=no
998 fi])
999 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1000 ;;
1001 esac
1002 if test "x$AUTOCONF" = xno; then
1003 aux_missing="$aux_missing autoconf"
1004 fi
1005 else
1006 AUTOCONF=no
1007 fi
1009 # Check for python3 if available, or else python.
1010 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1011 case "x$PYTHON_PROG" in
1012 xno|x|x:) PYTHON_PROG=no ;;
1013 *) ;;
1014 esac
1016 if test "x$PYTHON_PROG" = xno; then
1017 aux_missing="$aux_missing python"
1018 else
1019 PYTHON="$PYTHON_PROG -B"
1020 AC_SUBST(PYTHON)
1021 fi
1023 test -n "$critic_missing" && AC_MSG_ERROR([
1024 *** These critical programs are missing or too old:$critic_missing
1025 *** Check the INSTALL file for required versions.])
1027 test -n "$aux_missing" && AC_MSG_WARN([
1028 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1029 *** some features or tests will be disabled.
1030 *** Check the INSTALL file for required versions.])
1032 # if using special system headers, find out the compiler's sekrit
1033 # header directory and add that to the list. NOTE: Only does the right
1034 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1035 if test -n "$sysheaders"; then
1036 SYSINCLUDES=-nostdinc
1037 for d in include include-fixed; do
1038 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1039 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1040 done
1041 SYSINCLUDES="$SYSINCLUDES \
1042 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1043 if test -n "$CXX"; then
1044 CXX_SYSINCLUDES=
1045 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1046 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1047 test "x$cxxheaders" != x &&
1048 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1049 done
1050 fi
1051 fi
1052 AC_SUBST(SYSINCLUDES)
1053 AC_SUBST(CXX_SYSINCLUDES)
1055 # Obtain some C++ header file paths. This is used to make a local
1056 # copy of those headers in Makerules.
1057 if test -n "$CXX"; then
1058 find_cxx_header () {
1059 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1060 | sed -n "\,$1:,{s/:\$//;p}"
1061 }
1062 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1063 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1064 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1065 fi
1066 AC_SUBST(CXX_CSTDLIB_HEADER)
1067 AC_SUBST(CXX_CMATH_HEADER)
1068 AC_SUBST(CXX_BITS_STD_ABS_H)
1070 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1071 # since this would lead to problems installing/building glibc.
1072 # LD_LIBRARY_PATH contains the current directory if one of the following
1073 # is true:
1074 # - one of the terminals (":" and ";") is the first or last sign
1075 # - two terminals occur directly after each other
1076 # - the path contains an element with a dot in it
1077 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1078 changequote(,)dnl
1079 case ${LD_LIBRARY_PATH} in
1080 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1081 ld_library_path_setting="contains current directory"
1082 ;;
1083 *)
1084 ld_library_path_setting="ok"
1085 ;;
1086 esac
1087 changequote([,])dnl
1088 AC_MSG_RESULT($ld_library_path_setting)
1089 if test "$ld_library_path_setting" != "ok"; then
1090 AC_MSG_ERROR([
1091 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1092 *** building glibc. Please change the environment variable
1093 *** and run configure again.])
1094 fi
1096 AC_PATH_PROG(BASH_SHELL, bash, no)
1098 AC_PATH_PROG(PERL, perl, no)
1099 if test "$PERL" != no &&
1100 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1101 PERL=no
1102 fi
1103 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1104 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1106 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1107 cat > conftest.s <<EOF
1108 .text
1109 foo:
1110 .set glibc_conftest_frobozz,foo
1111 .globl glibc_conftest_frobozz
1112 EOF
1113 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1114 # (but it doesn't work), so we must do a linking check to be sure.
1115 cat > conftest1.c <<\EOF
1116 extern int glibc_conftest_frobozz;
1117 void _start() { glibc_conftest_frobozz = 1; }
1118 EOF
1119 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1120 -nostartfiles -nostdlib $no_ssp \
1121 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1122 libc_cv_asm_set_directive=yes
1123 else
1124 libc_cv_asm_set_directive=no
1125 fi
1126 rm -f conftest*])
1127 if test $libc_cv_asm_set_directive = yes; then
1128 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1129 fi
1131 AC_CACHE_CHECK(linker support for protected data symbol,
1132 libc_cv_protected_data,
1133 [cat > conftest.c <<EOF
1134 int bar __attribute__ ((visibility ("protected"))) = 1;
1135 EOF
1136 libc_cv_protected_data=no
1137 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1138 cat > conftest.c <<EOF
1139 extern int bar;
1140 int main (void) { return bar; }
1141 EOF
1142 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1143 libc_cv_protected_data=yes
1144 fi
1145 fi
1146 rm -f conftest.*
1147 ])
1148 AC_SUBST(libc_cv_protected_data)
1150 AC_CACHE_CHECK(linker support for INSERT in linker script,
1151 libc_cv_insert,
1152 [cat > conftest.c <<EOF
1153 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1154 int test (void) { return bar; }
1155 EOF
1156 cat > conftest.t <<EOF
1157 SECTIONS
1158 {
1159 .bar : { *(.bar) }
1160 }
1161 INSERT AFTER .rela.dyn;
1162 EOF
1163 libc_cv_insert=no
1164 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1165 libc_cv_insert=yes
1166 fi
1167 rm -f conftest.*
1168 ])
1169 AC_SUBST(libc_cv_insert)
1171 AC_CACHE_CHECK(for broken __attribute__((alias())),
1172 libc_cv_broken_alias_attribute,
1173 [cat > conftest.c <<EOF
1174 extern int foo (int x) __asm ("xyzzy");
1175 int bar (int x) { return x; }
1176 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1177 extern int dfoo;
1178 extern __typeof (dfoo) dfoo __asm ("abccb");
1179 int dfoo = 1;
1180 EOF
1181 libc_cv_broken_alias_attribute=yes
1182 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1183 if grep 'xyzzy' conftest.s >/dev/null &&
1184 grep 'abccb' conftest.s >/dev/null; then
1185 libc_cv_broken_alias_attribute=no
1186 fi
1187 fi
1188 rm -f conftest.c conftest.s
1189 ])
1190 if test $libc_cv_broken_alias_attribute = yes; then
1191 AC_MSG_ERROR(working alias attribute support required)
1192 fi
1194 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1195 libc_cv_have_sdata_section,
1196 [echo "int i;" > conftest.c
1197 libc_cv_have_sdata_section=no
1198 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1199 | grep '\.sdata' >/dev/null; then
1200 libc_cv_have_sdata_section=yes
1201 fi
1202 rm -f conftest.c conftest.so
1203 ])
1204 if test $libc_cv_have_sdata_section = yes; then
1205 AC_DEFINE(HAVE_SDATA_SECTION)
1206 fi
1208 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1209 libc_cv_ctors_header, [dnl
1210 libc_cv_ctors_header=yes
1211 LIBC_TRY_LINK_STATIC([
1212 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1213 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1214 ],
1215 [dnl
1216 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1217 { gsub(/\@<:@ */, "@<:@") }
1218 $2 == ".ctors" || $2 == ".dtors" {
1219 size = strtonum("0x" $6)
1220 align = strtonum("0x" $NF)
1221 seen@<:@$2@:>@ = 1
1222 stub@<:@$2@:>@ = size == align * 2
1223 }
1224 END {
1225 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1226 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1227 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1228 }
1229 '], [libc_cv_ctors_header=no])
1230 ], [dnl
1231 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1232 ])
1233 ])
1234 if test $libc_cv_ctors_header = no; then
1235 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1236 fi
1238 AC_CACHE_CHECK(for libunwind-support in compiler,
1239 libc_cv_cc_with_libunwind, [
1240 cat > conftest.c <<EOF
1241 int main (void) { return 0; }
1242 EOF
1243 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1244 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1245 libc_cv_cc_with_libunwind=yes
1246 else
1247 libc_cv_cc_with_libunwind=no
1248 fi
1249 rm -f conftest*])
1250 AC_SUBST(libc_cv_cc_with_libunwind)
1251 if test $libc_cv_cc_with_libunwind = yes; then
1252 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1253 fi
1255 ASFLAGS_config=
1256 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1257 libc_cv_as_noexecstack, [dnl
1258 cat > conftest.c <<EOF
1259 void foo (void) { }
1260 EOF
1261 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1262 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1263 && grep .note.GNU-stack conftest.s >/dev/null \
1264 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1265 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1266 then
1267 libc_cv_as_noexecstack=yes
1268 else
1269 libc_cv_as_noexecstack=no
1270 fi
1271 rm -f conftest*])
1272 if test $libc_cv_as_noexecstack = yes; then
1273 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1274 fi
1275 AC_SUBST(ASFLAGS_config)
1277 AC_CACHE_CHECK(for -z combreloc,
1278 libc_cv_z_combreloc, [dnl
1279 cat > conftest.c <<EOF
1280 extern int bar (int);
1281 extern int mumble;
1282 int foo (void) { return bar (mumble); }
1283 EOF
1284 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1285 -fPIC -shared $no_ssp -o conftest.so conftest.c
1286 -nostdlib -nostartfiles
1287 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1288 then
1289 dnl The following test is a bit weak. We must use a tool which can test
1290 dnl cross-platform since the gcc used can be a cross compiler. Without
1291 dnl introducing new options this is not easily doable. Instead use a tool
1292 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1293 dnl look for a section named .rel.dyn or .rela.dyn.
1294 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1295 libc_cv_z_combreloc=yes
1296 else
1297 libc_cv_z_combreloc=no
1298 fi
1299 else
1300 libc_cv_z_combreloc=no
1301 fi
1302 rm -f conftest*])
1303 if test "$libc_cv_z_combreloc" = yes; then
1304 AC_DEFINE(HAVE_Z_COMBRELOC)
1305 fi
1306 AC_SUBST(libc_cv_z_combreloc)
1308 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1309 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1310 AC_SUBST(libc_cv_z_execstack)
1312 LIBC_LINKER_FEATURE([--no-dynamic-linker],
1313 [-Wl,--no-dynamic-linker],
1314 [libc_cv_no_dynamic_linker=yes],
1315 [libc_cv_no_dynamic_linker=no])
1316 LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
1318 AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
1319 LIBC_TRY_CC_OPTION([-static-pie],
1320 [libc_cv_static_pie=yes],
1321 [libc_cv_static_pie=no])
1322 ])
1323 LIBC_CONFIG_VAR([have-static-pie], [$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])
1327 ])
1329 AC_SUBST(libc_cv_fpie)
1331 AC_CACHE_CHECK(for --hash-style option,
1332 libc_cv_hashstyle, [dnl
1333 cat > conftest.c <<EOF
1334 int _start (void) { return 42; }
1335 EOF
1336 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1337 -fPIC -shared -o conftest.so conftest.c
1338 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1339 then
1340 libc_cv_hashstyle=yes
1341 else
1342 libc_cv_hashstyle=no
1343 fi
1344 rm -f conftest*])
1345 AC_SUBST(libc_cv_hashstyle)
1347 # The linker's default -shared behavior is good enough if it
1348 # does these things that our custom linker scripts ensure that
1349 # all allocated NOTE sections come first.
1350 if test "$use_default_link" = default; then
1351 AC_CACHE_CHECK([for sufficient default -shared layout],
1352 libc_cv_use_default_link, [dnl
1353 libc_cv_use_default_link=no
1354 cat > conftest.s <<\EOF
1355 .section .note.a,"a",%note
1356 .balign 4
1357 .long 4,4,9
1358 .string "GNU"
1359 .string "foo"
1360 .section .note.b,"a",%note
1361 .balign 4
1362 .long 4,4,9
1363 .string "GNU"
1364 .string "bar"
1365 EOF
1366 if AC_TRY_COMMAND([dnl
1367 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1368 ac_try=`$READELF -S conftest.so | sed -n \
1369 ['${x;p;}
1370 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1371 t a
1372 b
1373 : a
1374 H']`
1375 then
1376 libc_seen_a=no libc_seen_b=no
1377 set -- $ac_try
1378 while test $# -ge 2 -a "$1" = NOTE; do
1379 case "$2" in
1380 .note.a) libc_seen_a=yes ;;
1381 .note.b) libc_seen_b=yes ;;
1382 esac
1383 shift 2
1384 done
1385 case "$libc_seen_a$libc_seen_b" in
1386 yesyes)
1387 libc_cv_use_default_link=yes
1388 ;;
1389 *)
1390 echo >&AS_MESSAGE_LOG_FD "\
1391 $libc_seen_a$libc_seen_b from:
1392 $ac_try"
1393 ;;
1394 esac
1395 fi
1396 rm -f conftest*])
1397 use_default_link=$libc_cv_use_default_link
1398 fi
1400 AC_CACHE_CHECK(for GLOB_DAT reloc,
1401 libc_cv_has_glob_dat, [dnl
1402 cat > conftest.c <<EOF
1403 extern int mumble;
1404 int foo (void) { return mumble; }
1405 EOF
1406 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1407 -fPIC -shared -o conftest.so conftest.c
1408 -nostdlib -nostartfiles $no_ssp
1409 1>&AS_MESSAGE_LOG_FD])
1410 then
1411 dnl look for GLOB_DAT relocation.
1412 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1413 libc_cv_has_glob_dat=yes
1414 else
1415 libc_cv_has_glob_dat=no
1416 fi
1417 else
1418 libc_cv_has_glob_dat=no
1419 fi
1420 rm -f conftest*])
1421 AC_SUBST(libc_cv_has_glob_dat)
1423 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1424 if libc_cv_output_format=`
1425 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1426 then
1427 :
1428 else
1429 libc_cv_output_format=
1430 fi
1431 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1432 AC_SUBST(libc_cv_output_format)
1434 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1435 cat > conftest.c <<EOF
1436 int foo;
1437 EOF
1438 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1439 conftest.c 1>&AS_MESSAGE_LOG_FD])
1440 then
1441 libc_cv_fno_toplevel_reorder=yes
1442 else
1443 libc_cv_fno_toplevel_reorder=no
1444 fi
1445 rm -f conftest*])
1446 if test $libc_cv_fno_toplevel_reorder = yes; then
1447 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1448 else
1449 fno_unit_at_a_time=-fno-unit-at-a-time
1450 fi
1451 AC_SUBST(fno_unit_at_a_time)
1453 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1454 [dnl
1455 cat > conftest.c <<EOF
1456 __thread int i;
1457 void foo (void)
1458 {
1459 i = 10;
1460 }
1461 EOF
1462 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1463 conftest.c 1>&AS_MESSAGE_LOG_FD])
1464 then
1465 libc_cv_mtls_dialect_gnu2=yes
1466 else
1467 libc_cv_mtls_dialect_gnu2=no
1468 fi
1469 rm -f conftest*])
1470 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1471 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1473 AC_CACHE_CHECK(whether cc puts quotes around section names,
1474 libc_cv_have_section_quotes,
1475 [cat > conftest.c <<EOF
1476 static const int foo
1477 __attribute__ ((section ("bar"))) = 1;
1478 EOF
1479 if ${CC-cc} -S conftest.c -o conftest.s; then
1480 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1481 libc_cv_have_section_quotes=yes
1482 else
1483 libc_cv_have_section_quotes=no
1484 fi
1485 else
1486 libc_cv_have_section_quotes=unknown
1487 fi
1488 rm -f conftest.{c,s}
1489 ])
1490 if test $libc_cv_have_section_quotes = yes; then
1491 AC_DEFINE(HAVE_SECTION_QUOTES)
1492 fi
1494 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1495 cat > conftest.c <<\EOF
1496 void zero (void *x)
1497 {
1498 __builtin_memset (x, 0, 1000);
1499 }
1500 EOF
1501 dnl
1502 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1503 then
1504 libc_cv_gcc_builtin_memset=no
1505 else
1506 libc_cv_gcc_builtin_memset=yes
1507 fi
1508 rm -f conftest* ])
1509 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1510 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1511 fi
1513 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1514 cat > conftest.c <<\EOF
1515 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1516 char *foo (const char *a, const char *b)
1517 {
1518 return __builtin_strstr (a, b);
1519 }
1520 EOF
1521 dnl
1522 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1523 then
1524 libc_cv_gcc_builtin_redirection=yes
1525 else
1526 libc_cv_gcc_builtin_redirection=no
1527 fi
1528 rm -f conftest* ])
1529 if test "$libc_cv_gcc_builtin_redirection" = no; then
1530 AC_MSG_ERROR([support for the symbol redirection needed])
1531 fi
1533 dnl Determine how to disable generation of FMA instructions.
1534 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1535 libc_cv_cc_nofma, [dnl
1536 libc_cv_cc_nofma=
1537 for opt in -ffp-contract=off -mno-fused-madd; do
1538 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1539 done])
1540 AC_SUBST(libc_cv_cc_nofma)
1542 if test -n "$submachine"; then
1543 AC_CACHE_CHECK([for compiler option for CPU variant],
1544 libc_cv_cc_submachine, [dnl
1545 libc_cv_cc_submachine=no
1546 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1547 LIBC_TRY_CC_OPTION([$opt], [
1548 libc_cv_cc_submachine="$opt"
1549 break], [])
1550 done])
1551 if test "x$libc_cv_cc_submachine" = xno; then
1552 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1553 fi
1554 fi
1555 AC_SUBST(libc_cv_cc_submachine)
1557 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1558 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1559 cat > conftest.c <<EOF
1560 void
1561 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1562 foo (void) {}
1563 EOF
1564 libc_cv_cc_loop_to_function=no
1565 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1566 then
1567 libc_cv_cc_loop_to_function=yes
1568 fi
1569 rm -f conftest*])
1570 if test $libc_cv_cc_loop_to_function = yes; then
1571 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1572 fi
1573 AC_SUBST(libc_cv_cc_loop_to_function)
1575 dnl Check whether we have the gd library available.
1576 AC_MSG_CHECKING(for libgd)
1577 if test "$with_gd" != "no"; then
1578 old_CFLAGS="$CFLAGS"
1579 CFLAGS="$CFLAGS $libgd_include"
1580 old_LDFLAGS="$LDFLAGS"
1581 LDFLAGS="$LDFLAGS $libgd_ldflags"
1582 old_LIBS="$LIBS"
1583 LIBS="$LIBS -lgd -lpng -lz -lm"
1584 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1585 CFLAGS="$old_CFLAGS"
1586 LDFLAGS="$old_LDFLAGS"
1587 LIBS="$old_LIBS"
1588 else
1589 LIBGD=no
1590 fi
1591 AC_MSG_RESULT($LIBGD)
1592 AC_SUBST(LIBGD)
1594 # SELinux detection
1595 if test x$with_selinux = xno ; then
1596 have_selinux=no;
1597 else
1598 # See if we have the SELinux library
1599 AC_CHECK_LIB(selinux, is_selinux_enabled,
1600 have_selinux=yes, have_selinux=no)
1601 if test x$with_selinux = xyes ; then
1602 if test x$have_selinux = xno ; then
1603 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1604 fi
1605 fi
1606 fi
1607 # Check if we're building with SELinux support.
1608 if test "x$have_selinux" = xyes; then
1609 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1611 # See if we have the libaudit library
1612 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1613 have_libaudit=yes, have_libaudit=no)
1614 if test "x$have_libaudit" = xyes; then
1615 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1616 fi
1617 AC_SUBST(have_libaudit)
1619 # See if we have the libcap library
1620 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1621 if test "x$have_libcap" = xyes; then
1622 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1623 fi
1624 AC_SUBST(have_libcap)
1625 fi
1626 AC_SUBST(have_selinux)
1628 CPPUNDEFS=
1629 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1630 dnl Since we are building the implementations of the fortified functions here,
1631 dnl having the macro defined interacts very badly.
1632 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1633 [AC_TRY_COMPILE([], [
1634 #ifdef _FORTIFY_SOURCE
1635 # error bogon
1636 #endif],
1637 [libc_cv_predef_fortify_source=no],
1638 [libc_cv_predef_fortify_source=yes])])
1639 if test $libc_cv_predef_fortify_source = yes; then
1640 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1641 fi
1642 AC_SUBST(CPPUNDEFS)
1644 # Some linkers on some architectures support __ehdr_start but with
1645 # bugs. Make sure usage of it does not create relocations in the
1646 # output (as the linker should resolve them all for us).
1647 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1648 libc_cv_ehdr_start, [
1649 old_CFLAGS="$CFLAGS"
1650 old_LDFLAGS="$LDFLAGS"
1651 old_LIBS="$LIBS"
1652 CFLAGS="$CFLAGS -fPIC"
1653 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1654 LIBS=
1655 AC_LINK_IFELSE([AC_LANG_SOURCE([
1656 typedef struct {
1657 char foo;
1658 long val;
1659 } Ehdr;
1660 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1661 long ehdr (void) { return __ehdr_start.val; }
1662 ])],
1663 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1664 libc_cv_ehdr_start=broken
1665 else
1666 libc_cv_ehdr_start=yes
1667 fi], [libc_cv_ehdr_start=no])
1668 CFLAGS="$old_CFLAGS"
1669 LDFLAGS="$old_LDFLAGS"
1670 LIBS="$old_LIBS"
1671 ])
1672 if test "$libc_cv_ehdr_start" = yes; then
1673 AC_DEFINE([HAVE_EHDR_START])
1674 elif test "$libc_cv_ehdr_start" = broken; then
1675 AC_MSG_WARN([linker is broken -- you should upgrade])
1676 fi
1678 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1679 libc_cv_builtin_trap, [dnl
1680 libc_cv_builtin_trap=no
1681 AC_TRY_COMPILE([], [__builtin_trap ()], [
1682 libc_undefs=`$NM -u conftest.o |
1683 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1684 2>&AS_MESSAGE_LOG_FD` || {
1685 AC_MSG_ERROR([confusing output from $NM -u])
1686 }
1687 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1688 if test -z "$libc_undefs"; then
1689 libc_cv_builtin_trap=yes
1690 fi])])
1691 if test $libc_cv_builtin_trap = yes; then
1692 AC_DEFINE([HAVE_BUILTIN_TRAP])
1693 fi
1695 dnl C++ feature tests.
1696 AC_LANG_PUSH([C++])
1698 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1699 libc_cv_cxx_thread_local, [
1700 old_CXXFLAGS="$CXXFLAGS"
1701 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1702 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1703 #include <thread>
1705 // Compiler support.
1706 struct S
1707 {
1708 S ();
1709 ~S ();
1710 };
1711 thread_local S s;
1712 S * get () { return &s; }
1714 // libstdc++ support.
1715 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1716 #error __cxa_thread_atexit_impl not supported
1717 #endif
1718 ])],
1719 [libc_cv_cxx_thread_local=yes],
1720 [libc_cv_cxx_thread_local=no])
1721 CXXFLAGS="$old_CXXFLAGS"
1722 ])
1723 AC_SUBST(libc_cv_cxx_thread_local)
1725 AC_LANG_POP([C++])
1726 dnl End of C++ feature tests.
1728 ### End of automated tests.
1729 ### Now run sysdeps configure fragments.
1731 # They also can set these variables.
1732 use_ldconfig=no
1733 ldd_rewrite_script=no
1734 libc_cv_sysconfdir=$sysconfdir
1735 libc_cv_localstatedir=$localstatedir
1736 libc_cv_gcc_unwind_find_fde=no
1737 libc_cv_idn=no
1739 # Iterate over all the sysdep directories we will use, running their
1740 # configure fragments.
1741 for dir in $sysnames; do
1742 case $dir in
1743 /*) dest=$dir ;;
1744 *) dest=$srcdir/$dir ;;
1745 esac
1746 if test -r $dest/configure; then
1747 AC_MSG_RESULT(running configure fragment for $dir)
1748 . $dest/configure
1749 fi
1750 done
1752 if test x"$build_mathvec" = xnotset; then
1753 build_mathvec=no
1754 fi
1755 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1757 AC_SUBST(libc_extra_cflags)
1758 AC_SUBST(libc_extra_cppflags)
1760 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1761 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1762 fi
1763 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1765 # A sysdeps configure fragment can reset this if IFUNC is not actually
1766 # usable even though the assembler knows how to generate the symbol type.
1767 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1768 AC_DEFINE(HAVE_IFUNC)
1769 fi
1771 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1772 AC_DEFINE(HAVE_GCC_IFUNC)
1773 fi
1775 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1776 # configure fragment can override the value to prevent this AC_DEFINE.
1777 AC_SUBST(use_nscd)
1778 if test "x$use_nscd" != xno; then
1779 AC_DEFINE([USE_NSCD])
1780 fi
1781 if test "x$build_nscd" = xdefault; then
1782 build_nscd=$use_nscd
1783 fi
1785 AC_SUBST(libc_cv_slibdir)
1786 AC_SUBST(libc_cv_rtlddir)
1787 AC_SUBST(libc_cv_complocaledir)
1788 AC_SUBST(libc_cv_sysconfdir)
1789 AC_SUBST(libc_cv_localstatedir)
1790 AC_SUBST(libc_cv_rootsbindir)
1792 if test x$use_ldconfig = xyes; then
1793 AC_DEFINE(USE_LDCONFIG)
1794 fi
1795 AC_SUBST(use_ldconfig)
1796 AC_SUBST(ldd_rewrite_script)
1798 AC_SUBST(static)
1799 AC_SUBST(shared)
1801 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1802 [libc_cv_pic_default=yes
1803 cat > conftest.c <<EOF
1804 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1805 # error PIC is default.
1806 #endif
1807 EOF
1808 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1809 libc_cv_pic_default=no
1810 fi
1811 rm -f conftest.*])
1812 AC_SUBST(libc_cv_pic_default)
1814 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
1815 [libc_cv_cc_pie_default=yes
1816 cat > conftest.c <<EOF
1817 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1818 # error PIE is default.
1819 #endif
1820 EOF
1821 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1822 libc_cv_cc_pie_default=no
1823 fi
1824 rm -f conftest.*])
1825 libc_cv_pie_default=$libc_cv_cc_pie_default
1826 AC_SUBST(libc_cv_cc_pie_default)
1827 AC_SUBST(libc_cv_pie_default)
1829 # Set the `multidir' variable by grabbing the variable from the compiler.
1830 # We do it once and save the result in a generated makefile.
1831 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
1832 AC_SUBST(libc_cv_multidir)
1834 if test "$static_pie" = yes; then
1835 # The linker must support --no-dynamic-linker.
1836 if test "$libc_cv_no_dynamic_linker" != yes; then
1837 AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
1838 fi
1839 # Default to PIE.
1840 libc_cv_pie_default=yes
1841 AC_DEFINE(ENABLE_STATIC_PIE)
1842 fi
1843 LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
1845 AC_SUBST(profile)
1846 AC_SUBST(static_nss)
1848 AC_SUBST(DEFINES)
1850 dnl See sysdeps/mach/configure.ac for this variable.
1851 AC_SUBST(mach_interface_list)
1853 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1854 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1855 AC_SUBST(VERSION)
1856 AC_SUBST(RELEASE)
1858 AC_CONFIG_FILES([config.make Makefile])
1859 AC_CONFIG_COMMANDS([default],[[
1860 case $CONFIG_FILES in *config.make*)
1861 echo "$config_vars" >> config.make;;
1862 esac
1863 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1864 AC_OUTPUT