| blob | 16e97d3930b8adaf3f134bb60ed70d68e1131c94 |
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)], [http://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 # <http://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 # <http://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 = $libgd_ldflags"
127 fi
129 dnl Arguments to specify presence of other packages/features.
130 AC_ARG_WITH([fp],
131 AC_HELP_STRING([--with-fp],
132 [if using floating-point hardware @<:@default=yes@:>@]),
133 [with_fp=$withval],
134 [with_fp=yes])
135 AC_SUBST(with_fp)
136 AC_ARG_WITH([binutils],
137 AC_HELP_STRING([--with-binutils=PATH],
138 [specify location of binutils (as and ld)]),
139 [path_binutils=$withval],
140 [path_binutils=''])
141 AC_ARG_WITH([selinux],
142 AC_HELP_STRING([--with-selinux],
143 [if building with SELinux support]),
144 [with_selinux=$withval],
145 [with_selinux=auto])
147 AC_ARG_WITH([headers],
148 AC_HELP_STRING([--with-headers=PATH],
149 [location of system headers to use
150 (for example /usr/src/linux/include)
151 @<:@default=compiler default@:>@]),
152 [sysheaders=$withval],
153 [sysheaders=''])
154 AC_SUBST(sysheaders)
156 AC_SUBST(use_default_link)
157 AC_ARG_WITH([default-link],
158 AC_HELP_STRING([--with-default-link],
159 [do not use explicit linker scripts]),
160 [use_default_link=$withval],
161 [use_default_link=default])
163 AC_ARG_ENABLE([sanity-checks],
164 AC_HELP_STRING([--disable-sanity-checks],
165 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
166 [enable_sanity=$enableval],
167 [enable_sanity=yes])
169 AC_ARG_ENABLE([shared],
170 AC_HELP_STRING([--enable-shared],
171 [build shared library @<:@default=yes if GNU ld@:>@]),
172 [shared=$enableval],
173 [shared=yes])
174 AC_ARG_ENABLE([profile],
175 AC_HELP_STRING([--enable-profile],
176 [build profiled library @<:@default=no@:>@]),
177 [profile=$enableval],
178 [profile=no])
179 AC_ARG_ENABLE([timezone-tools],
180 AC_HELP_STRING([--disable-timezone-tools],
181 [do not install timezone tools @<:@default=install@:>@]),
182 [enable_timezone_tools=$enableval],
183 [enable_timezone_tools=yes])
184 AC_SUBST(enable_timezone_tools)
186 AC_ARG_ENABLE([hardcoded-path-in-tests],
187 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
188 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
189 [hardcoded_path_in_tests=$enableval],
190 [hardcoded_path_in_tests=no])
191 AC_SUBST(hardcoded_path_in_tests)
193 AC_ARG_ENABLE([stackguard-randomization],
194 AC_HELP_STRING([--enable-stackguard-randomization],
195 [initialize __stack_chk_guard canary with a random number at program start]),
196 [enable_stackguard_randomize=$enableval],
197 [enable_stackguard_randomize=no])
198 if test "$enable_stackguard_randomize" = yes; then
199 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
200 fi
202 AC_ARG_ENABLE([lock-elision],
203 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
204 [Enable lock elision for pthread mutexes by default]),
205 [enable_lock_elision=$enableval],
206 [enable_lock_elision=no])
207 AC_SUBST(enable_lock_elision)
208 if test "$enable_lock_elision" = yes ; then
209 AC_DEFINE(ENABLE_LOCK_ELISION)
210 fi
212 dnl Generic infrastructure for drop-in additions to libc.
213 AC_ARG_ENABLE([add-ons],
214 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
215 [configure and build add-ons in DIR1,DIR2,...
216 search for add-ons if no parameter given]),
217 , [enable_add_ons=yes])
219 AC_ARG_ENABLE([hidden-plt],
220 AC_HELP_STRING([--disable-hidden-plt],
221 [do not hide internal function calls to avoid PLT]),
222 [hidden=$enableval],
223 [hidden=yes])
224 if test "x$hidden" = xno; then
225 AC_DEFINE(NO_HIDDEN)
226 fi
228 AC_ARG_ENABLE([bind-now],
229 AC_HELP_STRING([--enable-bind-now],
230 [disable lazy relocations in DSOs]),
231 [bindnow=$enableval],
232 [bindnow=no])
233 AC_SUBST(bindnow)
234 if test "x$bindnow" = xyes; then
235 AC_DEFINE(BIND_NOW)
236 fi
238 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
239 dnl -fstack-protector-strong.
240 AC_ARG_ENABLE([stack-protector],
241 AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
242 [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
243 [enable_stack_protector=$enableval],
244 [enable_stack_protector=no])
245 case "$enable_stack_protector" in
246 all|yes|no|strong) ;;
247 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
248 esac
250 dnl On some platforms we cannot use dynamic loading. We must provide
251 dnl static NSS modules.
252 AC_ARG_ENABLE([static-nss],
253 AC_HELP_STRING([--enable-static-nss],
254 [build static NSS modules @<:@default=no@:>@]),
255 [static_nss=$enableval],
256 [static_nss=no])
257 dnl Enable static NSS also if we build no shared objects.
258 if test x"$static_nss" = xyes || test x"$shared" = xno; then
259 static_nss=yes
260 AC_DEFINE(DO_STATIC_NSS)
261 fi
263 AC_ARG_ENABLE([force-install],
264 AC_HELP_STRING([--disable-force-install],
265 [don't force installation of files from this package, even if they are older than the installed files]),
266 [force_install=$enableval],
267 [force_install=yes])
268 AC_SUBST(force_install)
270 AC_ARG_ENABLE([maintainer-mode],
271 AC_HELP_STRING([--enable-maintainer-mode],
272 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
273 [maintainer=$enableval],
274 [maintainer=no])
276 dnl On some platforms we allow dropping compatibility with all kernel
277 dnl versions.
278 AC_ARG_ENABLE([kernel],
279 AC_HELP_STRING([--enable-kernel=VERSION],
280 [compile for compatibility with kernel not older than VERSION]),
281 [minimum_kernel=$enableval],
282 [])
283 dnl Prevent unreasonable values.
284 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
285 # Better nothing than this.
286 minimum_kernel=""
287 else
288 if test "$minimum_kernel" = current; then
289 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
290 fi
291 fi
293 dnl For the development we sometimes want gcc to issue even more warnings.
294 dnl This is not the default since many of the extra warnings are not
295 dnl appropriate.
296 AC_ARG_ENABLE([all-warnings],
297 AC_HELP_STRING([--enable-all-warnings],
298 [enable all useful warnings gcc can issue]),
299 [all_warnings=$enableval],
300 [])
301 AC_SUBST(all_warnings)
303 AC_ARG_ENABLE([werror],
304 AC_HELP_STRING([--disable-werror],
305 [do not build with -Werror]),
306 [enable_werror=$enableval],
307 [enable_werror=yes])
308 AC_SUBST(enable_werror)
310 AC_ARG_ENABLE([multi-arch],
311 AC_HELP_STRING([--enable-multi-arch],
312 [enable single DSO with optimizations for multiple architectures]),
313 [multi_arch=$enableval],
314 [multi_arch=default])
316 AC_ARG_ENABLE([nss-crypt],
317 AC_HELP_STRING([--enable-nss-crypt],
318 [enable libcrypt to use nss]),
319 [nss_crypt=$enableval],
320 [nss_crypt=no])
321 if test x$nss_crypt = xyes; then
322 nss_includes=-I$(nss-config --includedir 2>/dev/null)
323 if test $? -ne 0; then
324 AC_MSG_ERROR([cannot find include directory with nss-config])
325 fi
326 old_CFLAGS="$CFLAGS"
327 CFLAGS="$CFLAGS $nss_includes"
328 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
329 #include <hasht.h>
330 #include <nsslowhash.h>
331 void f (void) { NSSLOW_Init (); }])],
332 libc_cv_nss_crypt=yes,
333 AC_MSG_ERROR([
334 cannot find NSS headers with lowlevel hash function interfaces]))
335 old_LIBS="$LIBS"
336 old_LDFLAGS="$LDFLAGS"
337 LIBS="$LIBS -lfreebl3"
338 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
339 #include <hasht.h>
340 #include <nsslowhash.h>],
341 [NSSLOW_Init();])],
342 libc_cv_nss_crypt=yes,
343 AC_MSG_ERROR([
344 cannot link program using lowlevel NSS hash functions]))
345 # Check to see if there is a static NSS cryptographic library.
346 # If there isn't then we can't link anything with libcrypt.a,
347 # and that might mean disabling some static tests.
348 LDFLAGS="$LDFLAGS -static"
349 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
350 #include <hasht.h>
351 #include <nsslowhash.h>],
352 [NSSLOW_Init();])],
353 libc_cv_static_nss_crypt=yes,
354 libc_cv_static_nss_crypt=no)
355 LDFLAGS="$old_LDFLAGS"
356 CFLAGS="$old_CFLAGS"
357 LIBS="$old_LIBS"
358 else
359 libc_cv_nss_crypt=no
360 libc_cv_static_nss_crypt=no
361 fi
362 AC_SUBST(libc_cv_nss_crypt)
363 AC_SUBST(libc_cv_static_nss_crypt)
366 AC_ARG_ENABLE([obsolete-rpc],
367 AC_HELP_STRING([--enable-obsolete-rpc],
368 [build and install the obsolete RPC code for link-time usage]),
369 [link_obsolete_rpc=$enableval],
370 [link_obsolete_rpc=no])
371 AC_SUBST(link_obsolete_rpc)
373 if test "$link_obsolete_rpc" = yes; then
374 AC_DEFINE(LINK_OBSOLETE_RPC)
375 fi
377 AC_ARG_ENABLE([obsolete-nsl],
378 AC_HELP_STRING([--enable-obsolete-nsl],
379 [build and install the obsolete libnsl library and depending NSS modules]),
380 [build_obsolete_nsl=$enableval],
381 [build_obsolete_nsl=no])
382 AC_SUBST(build_obsolete_nsl)
384 if test "$build_obsolete_nsl" = yes; then
385 AC_DEFINE(LINK_OBSOLETE_NSL)
386 fi
388 AC_ARG_ENABLE([systemtap],
389 [AS_HELP_STRING([--enable-systemtap],
390 [enable systemtap static probe points @<:@default=no@:>@])],
391 [systemtap=$enableval],
392 [systemtap=no])
393 if test "x$systemtap" != xno; then
394 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
395 old_CFLAGS="$CFLAGS"
396 CFLAGS="-std=gnu11 $CFLAGS"
397 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
398 void foo (int i, void *p)
399 {
400 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
401 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
402 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
403 CFLAGS="$old_CFLAGS"])
404 if test $libc_cv_sdt = yes; then
405 AC_DEFINE([USE_STAP_PROBE])
406 elif test "x$systemtap" != xauto; then
407 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
408 fi
409 fi
411 AC_ARG_ENABLE([build-nscd],
412 [AS_HELP_STRING([--disable-build-nscd],
413 [disable building and installing the nscd daemon])],
414 [build_nscd=$enableval],
415 [build_nscd=default])
416 AC_SUBST(build_nscd)
418 # Note the use of $use_nscd is near the bottom of the file.
419 AC_ARG_ENABLE([nscd],
420 [AS_HELP_STRING([--disable-nscd],
421 [library functions will not contact the nscd daemon])],
422 [use_nscd=$enableval],
423 [use_nscd=yes])
425 AC_ARG_ENABLE([pt_chown],
426 [AS_HELP_STRING([--enable-pt_chown],
427 [Enable building and installing pt_chown])],
428 [build_pt_chown=$enableval],
429 [build_pt_chown=no])
430 AC_SUBST(build_pt_chown)
431 if test "$build_pt_chown" = yes; then
432 AC_DEFINE(HAVE_PT_CHOWN)
433 fi
435 AC_ARG_ENABLE([tunables],
436 [AS_HELP_STRING([--enable-tunables],
437 [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
438 [have_tunables=$enableval],
439 [have_tunables=yes])
440 AC_SUBST(have_tunables)
441 if test "$have_tunables" = yes; then
442 AC_DEFINE(HAVE_TUNABLES)
443 fi
445 # The abi-tags file uses a fairly simplistic model for name recognition that
446 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
447 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
448 # This doesn't get used much beyond that, so it's fairly safe.
449 case "$host_os" in
450 linux*)
451 ;;
452 gnu*)
453 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
454 ;;
455 esac
457 AC_ARG_ENABLE([mathvec],
458 [AS_HELP_STRING([--enable-mathvec],
459 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
460 [build_mathvec=$enableval],
461 [build_mathvec=notset])
463 # We keep the original values in `$config_*' and never modify them, so we
464 # can write them unchanged into config.make. Everything else uses
465 # $machine, $vendor, and $os, and changes them whenever convenient.
466 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
468 # Don't allow vendor == "unknown"
469 test "$config_vendor" = unknown && config_vendor=
470 config_os="`echo $config_os | sed 's/^unknown-//'`"
472 # Some configurations imply other options.
473 elf=yes
475 # The configure fragment of an add-on port can modify these to supplement
476 # or override the table in the case statement below. No fragment should
477 # ever change the config_* variables, however.
478 machine=$config_machine
479 vendor=$config_vendor
480 os=$config_os
481 base_os=''
483 submachine=
484 AC_ARG_WITH([cpu],
485 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
486 [dnl
487 case "$withval" in
488 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
489 no) ;;
490 *) submachine="$withval" ;;
491 esac
492 ])
494 # An preconfigure script can set this when it wants to disable the sanity
495 # check below.
496 libc_config_ok=no
498 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
499 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
501 dnl Having this here, though empty, makes sure that if add-ons' fragments
502 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
503 dnl our AC_OUTPUT will actually use it.
504 AC_CONFIG_SUBDIRS()
506 case "$enable_add_ons" in
507 ''|no) add_ons= ;;
508 yes|'*')
509 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
510 sed 's@/[[^/]]*$@@' | sort | uniq`
511 add_ons_automatic=yes
512 ;;
513 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
514 add_ons_automatic=no ;;
515 esac
517 configured_add_ons=
518 add_ons_sfx=
519 add_ons_pfx=
520 if test x"$add_ons" != x; then
521 for f in $add_ons; do
522 # Some sanity checks
523 case "$f" in
524 crypt)
525 AC_MSG_ERROR([
526 *** It seems that you're using an old \`crypt' add-on. crypt is now
527 *** part of glibc and using the old add-on will not work with this
528 *** release. Start again with fresh sources and without the old
529 *** \`crypt' add-on.])
530 ;;
531 localedata)
532 AC_MSG_ERROR([
533 *** It seems that you're using an old \`localedata' add-on. localedata
534 *** is now part of glibc and using the old add-on will not work with
535 *** this release. Start again with fresh sources and without the old
536 *** \`localedata' add-on.])
537 ;;
538 esac
539 done
541 # Now source each add-on's configure fragment.
542 # The fragments can use $srcdir/$libc_add_on to find themselves,
543 # and test $add_ons_automatic to see if they were explicitly requested.
544 # A fragment can clear (or even change) $libc_add_on to affect
545 # whether it goes into the list to be actually used in the build.
546 use_add_ons=
547 for libc_add_on in $add_ons; do
548 # Test whether such a directory really exists.
549 # It can be absolute, or relative to $srcdir, or relative to the build dir.
550 case "$libc_add_on" in
551 /*)
552 libc_add_on_srcdir=$libc_add_on
553 ;;
554 *)
555 test -d "$srcdir/$libc_add_on" || {
556 if test -d "$libc_add_on"; then
557 libc_add_on="`pwd`/$libc_add_on"
558 else
559 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
560 fi
561 }
562 libc_add_on_srcdir=$srcdir/$libc_add_on
563 ;;
564 esac
566 libc_add_on_frag=$libc_add_on_srcdir/configure
567 libc_add_on_canonical=
568 libc_add_on_config_subdirs=
569 if test -r "$libc_add_on_frag"; then
570 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
571 libc_add_on_canonical=unknown
572 libc_add_on_subdirs=
573 . "$libc_add_on_frag"
574 test -z "$libc_add_on" || {
575 configured_add_ons="$configured_add_ons $libc_add_on"
576 if test "x$libc_add_on_canonical" = xunknown; then
577 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
578 fi
579 for d in $libc_add_on_subdirs; do
580 case "$libc_add_on" in
581 /*) subdir_srcdir="$libc_add_on" ;;
582 *) subdir_srcdir="\$(..)$libc_add_on" ;;
583 esac
584 case "$d" in
585 .)
586 d="${libc_add_on_canonical:-$libc_add_on}"
587 ;;
588 /*)
589 subdir_srcdir="$d"
590 ;;
591 *)
592 subdir_srcdir="$subdir_srcdir/$d"
593 ;;
594 esac
595 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
596 add_on_subdirs="$add_on_subdirs $d"
597 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
598 $d-srcdir = $subdir_srcdir"
599 done
600 for d in $libc_add_on_config_subdirs; do
601 case "$d" in
602 /*) AC_MSG_ERROR(dnl
603 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
604 esac
605 if test ! -d "$libc_add_on_srcdir/$d"; then
606 AC_MSG_ERROR(fragment wants to configure missing directory $d)
607 fi
608 case "$libc_add_on" in
609 /*) AC_MSG_ERROR(dnl
610 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
611 esac
612 subdirs="$subdirs $libc_add_on/$d"
613 done
614 }
615 fi
616 if test -n "$libc_add_on"; then
617 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
618 use_add_ons="$use_add_ons $libc_add_on"
619 add_ons_pfx="$add_ons_pfx $libc_add_on/"
620 test -z "$libc_add_on_canonical" ||
621 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
622 fi
623 done
624 # Use echo to strip excess whitespace.
625 add_ons="`echo $use_add_ons`"
626 fi
627 AC_SUBST(add_ons)
628 AC_SUBST(add_on_subdirs)
631 ###
632 ### By using the undocumented --enable-hacker-mode option for configure
633 ### one can skip this test to make the configuration not fail for unsupported
634 ### platforms.
635 ###
636 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
637 case "$machine-$host_os" in
638 *-linux* | *-gnu*)
639 ;;
640 *)
641 AC_MSG_ERROR([
642 *** The GNU C library is currently unavailable for this platform.
643 *** If you are interested in seeing glibc on this platform visit
644 *** the "How to submit a new port" in the wiki:
645 *** https://sourceware.org/glibc/wiki/#Development
646 *** and join the community!])
647 ;;
648 esac
649 fi
651 # Set base_machine if not set by a preconfigure fragment.
652 test -n "$base_machine" || base_machine=$machine
653 AC_SUBST(base_machine)
655 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
656 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
657 [libc_cv_ssp=yes],
658 [libc_cv_ssp=no])
659 ])
661 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
662 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
663 [libc_cv_ssp_strong=yes],
664 [libc_cv_ssp_strong=no])
665 ])
667 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
668 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
669 [libc_cv_ssp_all=yes],
670 [libc_cv_ssp_all=no])
671 ])
673 stack_protector=
674 no_stack_protector=
675 if test "$libc_cv_ssp" = yes; then
676 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
677 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
678 fi
680 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
681 stack_protector="-fstack-protector"
682 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
683 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
684 stack_protector="-fstack-protector-all"
685 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
686 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
687 stack_protector="-fstack-protector-strong"
688 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
689 else
690 stack_protector="-fno-stack-protector"
691 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
692 fi
693 AC_SUBST(libc_cv_ssp)
694 AC_SUBST(stack_protector)
695 AC_SUBST(no_stack_protector)
697 if test -n "$stack_protector"; then
698 dnl Don't run configure tests with stack-protection on, to avoid problems with
699 dnl bootstrapping.
700 no_ssp=-fno-stack-protector
701 else
702 no_ssp=
704 if test "$enable_stack_protector" != no; then
705 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
706 fi
707 fi
709 # For the multi-arch option we need support in the assembler & linker.
710 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
711 libc_cv_ld_gnu_indirect_function, [dnl
712 cat > conftest.S <<EOF
713 .type foo,%gnu_indirect_function
714 foo:
715 .globl _start
716 _start:
717 .globl __start
718 __start:
719 .data
720 #ifdef _LP64
721 .quad foo
722 #else
723 .long foo
724 #endif
725 EOF
726 libc_cv_ld_gnu_indirect_function=no
727 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
728 -nostartfiles -nostdlib $no_ssp \
729 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
730 # Do a link to see if the backend supports IFUNC relocs.
731 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
732 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
733 libc_cv_ld_gnu_indirect_function=yes
734 }
735 fi
736 rm -f conftest*])
738 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
739 AC_CACHE_CHECK([for gcc attribute ifunc support],
740 libc_cv_gcc_indirect_function, [dnl
741 cat > conftest.c <<EOF
742 extern int func (int);
743 int used_func (int a)
744 {
745 return a;
746 }
747 static void *resolver ()
748 {
749 return &used_func;
750 }
751 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
752 EOF
753 libc_cv_gcc_indirect_function=no
754 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
755 2>&AS_MESSAGE_LOG_FD ; then
756 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
757 libc_cv_gcc_indirect_function=yes
758 fi
759 fi
760 rm -f conftest*])
762 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
763 if test x"$multi_arch" = xyes; then
764 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
765 else
766 multi_arch=no
767 fi
768 fi
769 if test x"$libc_cv_gcc_indirect_function" != xyes &&
770 test x"$multi_arch" = xyes; then
771 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
772 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
773 fi
774 multi_arch_d=
775 if test x"$multi_arch" != xno; then
776 multi_arch_d=/multiarch
777 fi
779 # Compute the list of sysdep directories for this configuration.
780 # This can take a while to compute.
781 sysdep_dir=$srcdir/sysdeps
782 AC_MSG_CHECKING(sysdep dirs)
783 dnl We need to use [ and ] for other purposes for a while now.
784 changequote(,)dnl
785 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
786 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
788 test "x$base_os" != x || case "$os" in
789 gnu*)
790 base_os=mach/hurd ;;
791 linux*)
792 base_os=unix/sysv ;;
793 esac
795 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
796 tail=$os
797 ostry=$os
798 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
799 ostry="$ostry /$o"
800 tail=$o
801 done
802 o=`echo $tail | sed 's/[0-9]*$//'`
803 if test $o != $tail; then
804 ostry="$ostry /$o"
805 fi
806 # For linux-gnu, try linux-gnu, then linux.
807 o=`echo $tail | sed 's/-.*$//'`
808 if test $o != $tail; then
809 ostry="$ostry /$o"
810 fi
812 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
813 base=
814 tail=$base_os
815 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
816 set $b
817 base="$base /$1"
818 tail="$2"
819 done
821 # For sparc/sparc32, try sparc/sparc32 and then sparc.
822 mach=
823 tail=$machine${submachine:+/$submachine}
824 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
825 set $m
826 # Prepend the machine's FPU directory unless --without-fp.
827 if test "$with_fp" = yes; then
828 maybe_fpu=/fpu
829 else
830 maybe_fpu=/nofpu
831 fi
832 # For each machine term, try it with and then without /multiarch.
833 for try_fpu in $maybe_fpu ''; do
834 for try_multi in $multi_arch_d ''; do
835 mach="$mach /$1$try_fpu$try_multi"
836 done
837 done
838 tail="$2"
839 done
841 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
842 changequote([,])dnl
844 # Find what sysdep directories exist.
845 sysnames_add_ons=
846 sysnames=
847 for b in $base ''; do
848 for m0 in $mach ''; do
849 for v in /$vendor ''; do
850 test "$v" = / && continue
851 for o in /$ostry ''; do
852 test "$o" = / && continue
853 for m in $mach ''; do
854 for d in $add_ons_pfx ''; do
855 for a in $add_ons_sfx ''; do
856 try_suffix="$m0$b$v$o$m"
857 if test -n "$try_suffix"; then
858 try_srcdir="${srcdir}/"
859 case "$d" in
860 /*) try_srcdir= ;;
861 esac
862 try="${d}sysdeps$try_suffix$a"
863 test -n "$enable_debug_configure" &&
864 echo "$0 [DEBUG]: try $try" >&2
865 if test -d "$try_srcdir$try"; then
866 sysnames="$sysnames $try"
867 { test -n "$o" || test -n "$b"; } && os_used=t
868 { test -n "$m" || test -n "$m0"; } && machine_used=t
869 case x${m0:-$m} in
870 x*/$submachine) submachine_used=t ;;
871 esac
872 if test -n "$d"; then
873 case "$sysnames_add_ons" in
874 *" $d "*) ;;
875 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
876 esac
877 fi
878 fi
879 fi
880 done
881 done
882 done
883 done
884 done
885 done
886 done
888 # If the assembler supports gnu_indirect_function symbol type and the
889 # architecture supports multi-arch, we enable multi-arch by default.
890 case $sysnames_add_ons$sysnames in
891 *"$multi_arch_d"*)
892 ;;
893 *)
894 test x"$multi_arch" = xdefault && multi_arch=no
895 ;;
896 esac
897 if test x"$multi_arch" != xno; then
898 AC_DEFINE(USE_MULTIARCH)
899 fi
900 AC_SUBST(multi_arch)
902 if test -z "$os_used" && test "$os" != none; then
903 AC_MSG_ERROR(Operating system $os is not supported.)
904 fi
905 if test -z "$machine_used" && test "$machine" != none; then
906 AC_MSG_ERROR(The $machine is not supported.)
907 fi
908 if test -z "$submachine_used" && test -n "$submachine"; then
909 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
910 fi
911 AC_SUBST(submachine)
913 # We have now validated the configuration.
915 # Expand the list of system names into a full list of directories
916 # from each element's parent name and Implies file (if present).
917 set $sysnames
918 names=
919 while test $# -gt 0; do
920 name=$1
921 shift
923 case " $names " in *" $name "*)
924 # Already in the list.
925 continue
926 esac
928 # Report each name as we discover it, so there is no long pause in output.
929 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
931 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
933 case $name in
934 /*) xsrcdir= ;;
935 *) xsrcdir=$srcdir/ ;;
936 esac
937 test -n "$enable_debug_configure" &&
938 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
940 for implies_file in Implies Implies-before Implies-after; do
941 implies_type=`echo $implies_file | sed s/-/_/`
942 eval ${implies_type}=
943 if test -f $xsrcdir$name/$implies_file; then
944 # Collect more names from the `Implies' file (removing comments).
945 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
946 for x in $implied_candidate; do
947 found=no
948 if test -d $xsrcdir$name_base/$x; then
949 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
950 found=yes
951 fi
952 for d in $add_ons_pfx ''; do
953 try="${d}sysdeps/$x"
954 case $d in
955 /*) try_srcdir= ;;
956 *) try_srcdir=$srcdir/ ;;
957 esac
958 test -n "$enable_debug_configure" &&
959 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
960 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
961 then
962 eval "${implies_type}=\"\$${implies_type} \$try\""
963 found=yes
964 case "$sysnames_add_ons" in
965 *" $d "*) ;;
966 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
967 esac
968 fi
969 done
970 if test $found = no; then
971 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
972 fi
973 done
974 fi
975 done
977 # Add NAME to the list of names.
978 names="$names $name"
980 # Find the parent of NAME, using the empty string if it has none.
981 changequote(,)dnl
982 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
983 changequote([,])dnl
985 test -n "$enable_debug_configure" &&
986 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
987 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
989 # Add the names implied by NAME, and NAME's parent (if it has one), to
990 # the list of names to be processed (the argument list). We prepend the
991 # implied names to the list and append the parent. We want implied
992 # directories to come before further directories inferred from the
993 # configuration components; this ensures that for sysv4, unix/common
994 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
995 # after sysv4).
996 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
997 test -n "$sysnames" && set $sysnames
998 done
1000 # Add the default directories.
1001 default_sysnames="sysdeps/generic"
1002 sysnames="$names $default_sysnames"
1003 AC_SUBST(sysnames)
1004 # The other names were emitted during the scan.
1005 AC_MSG_RESULT($default_sysnames)
1007 # Collect the list of add-ons that supply partial sysdeps trees.
1008 sysdeps_add_ons=
1009 for add_on in $add_ons; do
1010 case "$add_on" in
1011 /*) xsrcdir= ;;
1012 *) xsrcdir="$srcdir/" ;;
1013 esac
1015 test -d "$xsrcdir$add_on/sysdeps" || {
1016 case "$configured_add_ons " in
1017 *" $add_on "*) ;;
1018 *|'')
1019 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
1020 ;;
1021 esac
1022 continue
1023 }
1025 sysdeps_add_ons="$sysdeps_add_ons $add_on"
1026 case "$sysnames_add_ons" in
1027 *" $add_on/ "*) ;;
1028 *|'')
1029 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
1030 continue ;;
1031 esac
1033 found=no
1034 for d in $sysnames; do
1035 case "$d" in
1036 $add_on/sysdeps/*) ;;
1037 *) continue ;;
1038 esac
1039 (cd "$xsrcdir$d" && for f in *[[!~]]; do
1040 case "$f" in
1041 sys|bits)
1042 for ff in $f/*.h; do
1043 test -d "$ff" || { test -e "$ff" && exit 88; }
1044 done
1045 ;;
1046 *)
1047 test -d "$f" || { test -e "$f" && exit 88; }
1048 ;;
1049 esac
1050 done)
1051 if test $? -eq 88; then
1052 found=yes
1053 break
1054 fi
1055 done
1056 if test $found = no; then
1057 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
1058 fi
1059 done
1060 AC_SUBST(sysdeps_add_ons)
1063 ### Locate tools.
1065 AC_PROG_INSTALL
1066 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
1067 # The makefiles need to use a different form to find it in $srcdir.
1068 INSTALL='\$(..)./scripts/install-sh -c'
1069 fi
1070 AC_PROG_LN_S
1072 LIBC_PROG_BINUTILS
1074 # Accept binutils 2.22 or newer.
1075 AC_CHECK_PROG_VER(AS, $AS, --version,
1076 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
1077 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1078 AS=: critic_missing="$critic_missing as")
1079 AC_CHECK_PROG_VER(LD, $LD, --version,
1080 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
1081 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1082 LD=: critic_missing="$critic_missing ld")
1084 # These programs are version sensitive.
1085 AC_CHECK_TOOL_PREFIX
1086 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1087 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1088 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1090 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1091 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1092 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1093 MSGFMT=: aux_missing="$aux_missing msgfmt")
1094 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1095 [GNU texinfo.* \([0-9][0-9.]*\)],
1096 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1097 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1098 AC_CHECK_PROG_VER(SED, sed, --version,
1099 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1100 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1101 SED=: aux_missing="$aux_missing sed")
1102 AC_CHECK_PROG_VER(AWK, gawk, --version,
1103 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1104 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1106 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1107 AC_TRY_COMPILE([], [
1108 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
1109 #error insufficient compiler
1110 #endif],
1111 [libc_cv_compiler_ok=yes],
1112 [libc_cv_compiler_ok=no])])
1113 AS_IF([test $libc_cv_compiler_ok != yes],
1114 [critic_missing="$critic_missing compiler"])
1116 AC_CHECK_TOOL(NM, nm, false)
1118 if test "x$maintainer" = "xyes"; then
1119 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1120 case "x$AUTOCONF" in
1121 xno|x|x:) AUTOCONF=no ;;
1122 *)
1123 AC_CACHE_CHECK(dnl
1124 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1125 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1126 libc_cv_autoconf_works=yes
1127 else
1128 libc_cv_autoconf_works=no
1129 fi])
1130 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1131 ;;
1132 esac
1133 if test "x$AUTOCONF" = xno; then
1134 aux_missing="$aux_missing autoconf"
1135 fi
1136 else
1137 AUTOCONF=no
1138 fi
1140 # Check for python3 if available, or else python.
1141 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1142 case "x$PYTHON_PROG" in
1143 xno|x|x:) PYTHON_PROG=no ;;
1144 *) ;;
1145 esac
1147 if test "x$PYTHON_PROG" = xno; then
1148 aux_missing="$aux_missing python"
1149 else
1150 PYTHON="$PYTHON_PROG -B"
1151 AC_SUBST(PYTHON)
1152 fi
1154 test -n "$critic_missing" && AC_MSG_ERROR([
1155 *** These critical programs are missing or too old:$critic_missing
1156 *** Check the INSTALL file for required versions.])
1158 test -n "$aux_missing" && AC_MSG_WARN([
1159 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1160 *** some features or tests will be disabled.
1161 *** Check the INSTALL file for required versions.])
1163 # if using special system headers, find out the compiler's sekrit
1164 # header directory and add that to the list. NOTE: Only does the right
1165 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1166 if test -n "$sysheaders"; then
1167 SYSINCLUDES=-nostdinc
1168 for d in include include-fixed; do
1169 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1170 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1171 done
1172 SYSINCLUDES="$SYSINCLUDES \
1173 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1174 if test -n "$CXX"; then
1175 CXX_SYSINCLUDES=
1176 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1177 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1178 test "x$cxxheaders" != x &&
1179 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1180 done
1181 fi
1182 fi
1183 AC_SUBST(SYSINCLUDES)
1184 AC_SUBST(CXX_SYSINCLUDES)
1186 # Obtain some C++ header file paths. This is used to make a local
1187 # copy of those headers in Makerules.
1188 if test -n "$CXX"; then
1189 find_cxx_header () {
1190 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1191 | sed -n "\,$1:,{s/:\$//;p}"
1192 }
1193 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1194 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1195 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1196 fi
1197 AC_SUBST(CXX_CSTDLIB_HEADER)
1198 AC_SUBST(CXX_CMATH_HEADER)
1199 AC_SUBST(CXX_BITS_STD_ABS_H)
1201 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1202 # since this would lead to problems installing/building glibc.
1203 # LD_LIBRARY_PATH contains the current directory if one of the following
1204 # is true:
1205 # - one of the terminals (":" and ";") is the first or last sign
1206 # - two terminals occur directly after each other
1207 # - the path contains an element with a dot in it
1208 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1209 changequote(,)dnl
1210 case ${LD_LIBRARY_PATH} in
1211 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1212 ld_library_path_setting="contains current directory"
1213 ;;
1214 *)
1215 ld_library_path_setting="ok"
1216 ;;
1217 esac
1218 changequote([,])dnl
1219 AC_MSG_RESULT($ld_library_path_setting)
1220 if test "$ld_library_path_setting" != "ok"; then
1221 AC_MSG_ERROR([
1222 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1223 *** building glibc. Please change the environment variable
1224 *** and run configure again.])
1225 fi
1227 AC_PATH_PROG(BASH_SHELL, bash, no)
1229 AC_PATH_PROG(PERL, perl, no)
1230 if test "$PERL" != no &&
1231 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1232 PERL=no
1233 fi
1234 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1235 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1236 AC_CHECK_PROG_VER(BISON, bison, --version,
1237 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1238 [2.7*|[3-9].*|[1-9][0-9]*],
1239 BISON=no)
1241 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1242 cat > conftest.s <<EOF
1243 .text
1244 foo:
1245 .set glibc_conftest_frobozz,foo
1246 .globl glibc_conftest_frobozz
1247 EOF
1248 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1249 # (but it doesn't work), so we must do a linking check to be sure.
1250 cat > conftest1.c <<\EOF
1251 extern int glibc_conftest_frobozz;
1252 void _start() { glibc_conftest_frobozz = 1; }
1253 EOF
1254 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1255 -nostartfiles -nostdlib $no_ssp \
1256 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1257 libc_cv_asm_set_directive=yes
1258 else
1259 libc_cv_asm_set_directive=no
1260 fi
1261 rm -f conftest*])
1262 if test $libc_cv_asm_set_directive = yes; then
1263 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1264 fi
1266 AC_CACHE_CHECK(linker support for protected data symbol,
1267 libc_cv_protected_data,
1268 [cat > conftest.c <<EOF
1269 int bar __attribute__ ((visibility ("protected"))) = 1;
1270 EOF
1271 libc_cv_protected_data=no
1272 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1273 cat > conftest.c <<EOF
1274 extern int bar;
1275 int main (void) { return bar; }
1276 EOF
1277 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1278 libc_cv_protected_data=yes
1279 fi
1280 fi
1281 rm -f conftest.*
1282 ])
1283 AC_SUBST(libc_cv_protected_data)
1285 AC_CACHE_CHECK(for broken __attribute__((alias())),
1286 libc_cv_broken_alias_attribute,
1287 [cat > conftest.c <<EOF
1288 extern int foo (int x) __asm ("xyzzy");
1289 int bar (int x) { return x; }
1290 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1291 extern int dfoo;
1292 extern __typeof (dfoo) dfoo __asm ("abccb");
1293 int dfoo = 1;
1294 EOF
1295 libc_cv_broken_alias_attribute=yes
1296 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1297 if grep 'xyzzy' conftest.s >/dev/null &&
1298 grep 'abccb' conftest.s >/dev/null; then
1299 libc_cv_broken_alias_attribute=no
1300 fi
1301 fi
1302 rm -f conftest.c conftest.s
1303 ])
1304 if test $libc_cv_broken_alias_attribute = yes; then
1305 AC_MSG_ERROR(working alias attribute support required)
1306 fi
1308 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1309 libc_cv_have_sdata_section,
1310 [echo "int i;" > conftest.c
1311 libc_cv_have_sdata_section=no
1312 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1313 | grep '\.sdata' >/dev/null; then
1314 libc_cv_have_sdata_section=yes
1315 fi
1316 rm -f conftest.c conftest.so
1317 ])
1318 if test $libc_cv_have_sdata_section = yes; then
1319 AC_DEFINE(HAVE_SDATA_SECTION)
1320 fi
1322 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1323 libc_cv_ctors_header, [dnl
1324 libc_cv_ctors_header=yes
1325 LIBC_TRY_LINK_STATIC([
1326 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1327 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1328 ],
1329 [dnl
1330 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1331 { gsub(/\@<:@ */, "@<:@") }
1332 $2 == ".ctors" || $2 == ".dtors" {
1333 size = strtonum("0x" $6)
1334 align = strtonum("0x" $NF)
1335 seen@<:@$2@:>@ = 1
1336 stub@<:@$2@:>@ = size == align * 2
1337 }
1338 END {
1339 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1340 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1341 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1342 }
1343 '], [libc_cv_ctors_header=no])
1344 ], [dnl
1345 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1346 ])
1347 ])
1348 if test $libc_cv_ctors_header = no; then
1349 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1350 fi
1352 AC_CACHE_CHECK(for libunwind-support in compiler,
1353 libc_cv_cc_with_libunwind, [
1354 cat > conftest.c <<EOF
1355 int main (void) { return 0; }
1356 EOF
1357 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1358 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1359 libc_cv_cc_with_libunwind=yes
1360 else
1361 libc_cv_cc_with_libunwind=no
1362 fi
1363 rm -f conftest*])
1364 AC_SUBST(libc_cv_cc_with_libunwind)
1365 if test $libc_cv_cc_with_libunwind = yes; then
1366 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1367 fi
1369 ASFLAGS_config=
1370 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1371 libc_cv_as_noexecstack, [dnl
1372 cat > conftest.c <<EOF
1373 void foo (void) { }
1374 EOF
1375 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1376 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1377 && grep .note.GNU-stack conftest.s >/dev/null \
1378 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1379 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1380 then
1381 libc_cv_as_noexecstack=yes
1382 else
1383 libc_cv_as_noexecstack=no
1384 fi
1385 rm -f conftest*])
1386 if test $libc_cv_as_noexecstack = yes; then
1387 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1388 fi
1389 AC_SUBST(ASFLAGS_config)
1391 AC_CACHE_CHECK(for -z combreloc,
1392 libc_cv_z_combreloc, [dnl
1393 cat > conftest.c <<EOF
1394 extern int bar (int);
1395 extern int mumble;
1396 int foo (void) { return bar (mumble); }
1397 EOF
1398 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1399 -fPIC -shared $no_ssp -o conftest.so conftest.c
1400 -nostdlib -nostartfiles
1401 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1402 then
1403 dnl The following test is a bit weak. We must use a tool which can test
1404 dnl cross-platform since the gcc used can be a cross compiler. Without
1405 dnl introducing new options this is not easily doable. Instead use a tool
1406 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1407 dnl look for a section named .rel.dyn or .rela.dyn.
1408 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1409 libc_cv_z_combreloc=yes
1410 else
1411 libc_cv_z_combreloc=no
1412 fi
1413 else
1414 libc_cv_z_combreloc=no
1415 fi
1416 rm -f conftest*])
1417 if test "$libc_cv_z_combreloc" = yes; then
1418 AC_DEFINE(HAVE_Z_COMBRELOC)
1419 fi
1420 AC_SUBST(libc_cv_z_combreloc)
1422 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1423 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1424 AC_SUBST(libc_cv_z_execstack)
1426 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1427 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1428 ])
1430 AC_SUBST(libc_cv_fpie)
1432 AC_CACHE_CHECK(for --hash-style option,
1433 libc_cv_hashstyle, [dnl
1434 cat > conftest.c <<EOF
1435 int _start (void) { return 42; }
1436 EOF
1437 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1438 -fPIC -shared -o conftest.so conftest.c
1439 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1440 then
1441 libc_cv_hashstyle=yes
1442 else
1443 libc_cv_hashstyle=no
1444 fi
1445 rm -f conftest*])
1446 AC_SUBST(libc_cv_hashstyle)
1448 # The linker's default -shared behavior is good enough if it
1449 # does these things that our custom linker scripts ensure that
1450 # all allocated NOTE sections come first.
1451 if test "$use_default_link" = default; then
1452 AC_CACHE_CHECK([for sufficient default -shared layout],
1453 libc_cv_use_default_link, [dnl
1454 libc_cv_use_default_link=no
1455 cat > conftest.s <<\EOF
1456 .section .note.a,"a",%note
1457 .balign 4
1458 .long 4,4,9
1459 .string "GNU"
1460 .string "foo"
1461 .section .note.b,"a",%note
1462 .balign 4
1463 .long 4,4,9
1464 .string "GNU"
1465 .string "bar"
1466 EOF
1467 if AC_TRY_COMMAND([dnl
1468 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1469 ac_try=`$READELF -S conftest.so | sed -n \
1470 ['${x;p;}
1471 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1472 t a
1473 b
1474 : a
1475 H']`
1476 then
1477 libc_seen_a=no libc_seen_b=no
1478 set -- $ac_try
1479 while test $# -ge 2 -a "$1" = NOTE; do
1480 case "$2" in
1481 .note.a) libc_seen_a=yes ;;
1482 .note.b) libc_seen_b=yes ;;
1483 esac
1484 shift 2
1485 done
1486 case "$libc_seen_a$libc_seen_b" in
1487 yesyes)
1488 libc_cv_use_default_link=yes
1489 ;;
1490 *)
1491 echo >&AS_MESSAGE_LOG_FD "\
1492 $libc_seen_a$libc_seen_b from:
1493 $ac_try"
1494 ;;
1495 esac
1496 fi
1497 rm -f conftest*])
1498 use_default_link=$libc_cv_use_default_link
1499 fi
1501 AC_CACHE_CHECK(for GLOB_DAT reloc,
1502 libc_cv_has_glob_dat, [dnl
1503 cat > conftest.c <<EOF
1504 extern int mumble;
1505 int foo (void) { return mumble; }
1506 EOF
1507 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1508 -fPIC -shared -o conftest.so conftest.c
1509 -nostdlib -nostartfiles $no_ssp
1510 1>&AS_MESSAGE_LOG_FD])
1511 then
1512 dnl look for GLOB_DAT relocation.
1513 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1514 libc_cv_has_glob_dat=yes
1515 else
1516 libc_cv_has_glob_dat=no
1517 fi
1518 else
1519 libc_cv_has_glob_dat=no
1520 fi
1521 rm -f conftest*])
1522 AC_SUBST(libc_cv_has_glob_dat)
1524 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1525 if libc_cv_output_format=`
1526 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1527 then
1528 :
1529 else
1530 libc_cv_output_format=
1531 fi
1532 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1533 AC_SUBST(libc_cv_output_format)
1535 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1536 cat > conftest.c <<EOF
1537 int foo;
1538 EOF
1539 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1540 conftest.c 1>&AS_MESSAGE_LOG_FD])
1541 then
1542 libc_cv_fno_toplevel_reorder=yes
1543 else
1544 libc_cv_fno_toplevel_reorder=no
1545 fi
1546 rm -f conftest*])
1547 if test $libc_cv_fno_toplevel_reorder = yes; then
1548 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1549 else
1550 fno_unit_at_a_time=-fno-unit-at-a-time
1551 fi
1552 AC_SUBST(fno_unit_at_a_time)
1554 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1555 [dnl
1556 cat > conftest.c <<EOF
1557 __thread int i;
1558 void foo (void)
1559 {
1560 i = 10;
1561 }
1562 EOF
1563 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1564 conftest.c 1>&AS_MESSAGE_LOG_FD])
1565 then
1566 libc_cv_mtls_dialect_gnu2=yes
1567 else
1568 libc_cv_mtls_dialect_gnu2=no
1569 fi
1570 rm -f conftest*])
1571 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1572 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1574 AC_CACHE_CHECK(whether cc puts quotes around section names,
1575 libc_cv_have_section_quotes,
1576 [cat > conftest.c <<EOF
1577 static const int foo
1578 __attribute__ ((section ("bar"))) = 1;
1579 EOF
1580 if ${CC-cc} -S conftest.c -o conftest.s; then
1581 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1582 libc_cv_have_section_quotes=yes
1583 else
1584 libc_cv_have_section_quotes=no
1585 fi
1586 else
1587 libc_cv_have_section_quotes=unknown
1588 fi
1589 rm -f conftest.{c,s}
1590 ])
1591 if test $libc_cv_have_section_quotes = yes; then
1592 AC_DEFINE(HAVE_SECTION_QUOTES)
1593 fi
1595 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1596 cat > conftest.c <<\EOF
1597 void zero (void *x)
1598 {
1599 __builtin_memset (x, 0, 1000);
1600 }
1601 EOF
1602 dnl
1603 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1604 then
1605 libc_cv_gcc_builtin_memset=no
1606 else
1607 libc_cv_gcc_builtin_memset=yes
1608 fi
1609 rm -f conftest* ])
1610 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1611 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1612 fi
1614 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1615 cat > conftest.c <<\EOF
1616 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1617 char *foo (const char *a, const char *b)
1618 {
1619 return __builtin_strstr (a, b);
1620 }
1621 EOF
1622 dnl
1623 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1624 then
1625 libc_cv_gcc_builtin_redirection=yes
1626 else
1627 libc_cv_gcc_builtin_redirection=no
1628 fi
1629 rm -f conftest* ])
1630 if test "$libc_cv_gcc_builtin_redirection" = no; then
1631 AC_MSG_ERROR([support for the symbol redirection needed])
1632 fi
1634 dnl Determine how to disable generation of FMA instructions.
1635 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1636 libc_cv_cc_nofma, [dnl
1637 libc_cv_cc_nofma=
1638 for opt in -ffp-contract=off -mno-fused-madd; do
1639 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1640 done])
1641 AC_SUBST(libc_cv_cc_nofma)
1643 if test -n "$submachine"; then
1644 AC_CACHE_CHECK([for compiler option for CPU variant],
1645 libc_cv_cc_submachine, [dnl
1646 libc_cv_cc_submachine=no
1647 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1648 LIBC_TRY_CC_OPTION([$opt], [
1649 libc_cv_cc_submachine="$opt"
1650 break], [])
1651 done])
1652 if test "x$libc_cv_cc_submachine" = xno; then
1653 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1654 fi
1655 fi
1656 AC_SUBST(libc_cv_cc_submachine)
1658 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1659 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1660 cat > conftest.c <<EOF
1661 void
1662 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1663 foo (void) {}
1664 EOF
1665 libc_cv_cc_loop_to_function=no
1666 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1667 then
1668 libc_cv_cc_loop_to_function=yes
1669 fi
1670 rm -f conftest*])
1671 if test $libc_cv_cc_loop_to_function = yes; then
1672 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1673 fi
1674 AC_SUBST(libc_cv_cc_loop_to_function)
1676 dnl Check whether we have the gd library available.
1677 AC_MSG_CHECKING(for libgd)
1678 if test "$with_gd" != "no"; then
1679 old_CFLAGS="$CFLAGS"
1680 CFLAGS="$CFLAGS $libgd_include"
1681 old_LDFLAGS="$LDFLAGS"
1682 LDFLAGS="$LDFLAGS $libgd_ldflags"
1683 old_LIBS="$LIBS"
1684 LIBS="$LIBS -lgd -lpng -lz -lm"
1685 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1686 CFLAGS="$old_CFLAGS"
1687 LDFLAGS="$old_LDFLAGS"
1688 LIBS="$old_LIBS"
1689 else
1690 LIBGD=no
1691 fi
1692 AC_MSG_RESULT($LIBGD)
1693 AC_SUBST(LIBGD)
1695 # SELinux detection
1696 if test x$with_selinux = xno ; then
1697 have_selinux=no;
1698 else
1699 # See if we have the SELinux library
1700 AC_CHECK_LIB(selinux, is_selinux_enabled,
1701 have_selinux=yes, have_selinux=no)
1702 if test x$with_selinux = xyes ; then
1703 if test x$have_selinux = xno ; then
1704 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1705 fi
1706 fi
1707 fi
1708 # Check if we're building with SELinux support.
1709 if test "x$have_selinux" = xyes; then
1710 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1712 # See if we have the libaudit library
1713 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1714 have_libaudit=yes, have_libaudit=no)
1715 if test "x$have_libaudit" = xyes; then
1716 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1717 fi
1718 AC_SUBST(have_libaudit)
1720 # See if we have the libcap library
1721 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1722 if test "x$have_libcap" = xyes; then
1723 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1724 fi
1725 AC_SUBST(have_libcap)
1726 fi
1727 AC_SUBST(have_selinux)
1729 CPPUNDEFS=
1730 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1731 dnl Since we are building the implementations of the fortified functions here,
1732 dnl having the macro defined interacts very badly.
1733 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1734 [AC_TRY_COMPILE([], [
1735 #ifdef _FORTIFY_SOURCE
1736 # error bogon
1737 #endif],
1738 [libc_cv_predef_fortify_source=no],
1739 [libc_cv_predef_fortify_source=yes])])
1740 if test $libc_cv_predef_fortify_source = yes; then
1741 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1742 fi
1743 AC_SUBST(CPPUNDEFS)
1745 # Some linkers on some architectures support __ehdr_start but with
1746 # bugs. Make sure usage of it does not create relocations in the
1747 # output (as the linker should resolve them all for us).
1748 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1749 libc_cv_ehdr_start, [
1750 old_CFLAGS="$CFLAGS"
1751 old_LDFLAGS="$LDFLAGS"
1752 old_LIBS="$LIBS"
1753 CFLAGS="$CFLAGS -fPIC"
1754 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1755 LIBS=
1756 AC_LINK_IFELSE([AC_LANG_SOURCE([
1757 typedef struct {
1758 char foo;
1759 long val;
1760 } Ehdr;
1761 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1762 long ehdr (void) { return __ehdr_start.val; }
1763 ])],
1764 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1765 libc_cv_ehdr_start=broken
1766 else
1767 libc_cv_ehdr_start=yes
1768 fi], [libc_cv_ehdr_start=no])
1769 CFLAGS="$old_CFLAGS"
1770 LDFLAGS="$old_LDFLAGS"
1771 LIBS="$old_LIBS"
1772 ])
1773 if test "$libc_cv_ehdr_start" = yes; then
1774 AC_DEFINE([HAVE_EHDR_START])
1775 elif test "$libc_cv_ehdr_start" = broken; then
1776 AC_MSG_WARN([linker is broken -- you should upgrade])
1777 fi
1779 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1780 libc_cv_builtin_trap, [dnl
1781 libc_cv_builtin_trap=no
1782 AC_TRY_COMPILE([], [__builtin_trap ()], [
1783 libc_undefs=`$NM -u conftest.o |
1784 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1785 2>&AS_MESSAGE_LOG_FD` || {
1786 AC_MSG_ERROR([confusing output from $NM -u])
1787 }
1788 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1789 if test -z "$libc_undefs"; then
1790 libc_cv_builtin_trap=yes
1791 fi])])
1792 if test $libc_cv_builtin_trap = yes; then
1793 AC_DEFINE([HAVE_BUILTIN_TRAP])
1794 fi
1796 dnl C++ feature tests.
1797 AC_LANG_PUSH([C++])
1799 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1800 libc_cv_cxx_thread_local, [
1801 old_CXXFLAGS="$CXXFLAGS"
1802 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1803 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1804 #include <thread>
1806 // Compiler support.
1807 struct S
1808 {
1809 S ();
1810 ~S ();
1811 };
1812 thread_local S s;
1813 S * get () { return &s; }
1815 // libstdc++ support.
1816 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1817 #error __cxa_thread_atexit_impl not supported
1818 #endif
1819 ])],
1820 [libc_cv_cxx_thread_local=yes],
1821 [libc_cv_cxx_thread_local=no])
1822 CXXFLAGS="$old_CXXFLAGS"
1823 ])
1824 AC_SUBST(libc_cv_cxx_thread_local)
1826 AC_LANG_POP([C++])
1827 dnl End of C++ feature tests.
1829 ### End of automated tests.
1830 ### Now run sysdeps configure fragments.
1832 # They also can set these variables.
1833 use_ldconfig=no
1834 ldd_rewrite_script=no
1835 libc_cv_sysconfdir=$sysconfdir
1836 libc_cv_localstatedir=$localstatedir
1837 libc_cv_gcc_unwind_find_fde=no
1838 libc_cv_idn=no
1840 # Iterate over all the sysdep directories we will use, running their
1841 # configure fragments.
1842 for dir in $sysnames; do
1843 case $dir in
1844 /*) dest=$dir ;;
1845 *) dest=$srcdir/$dir ;;
1846 esac
1847 if test -r $dest/configure; then
1848 AC_MSG_RESULT(running configure fragment for $dir)
1849 . $dest/configure
1850 fi
1851 done
1853 if test x"$build_mathvec" = xnotset; then
1854 build_mathvec=no
1855 fi
1856 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1858 AC_SUBST(libc_extra_cflags)
1859 AC_SUBST(libc_extra_cppflags)
1861 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1862 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1863 fi
1864 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1866 # A sysdeps configure fragment can reset this if IFUNC is not actually
1867 # usable even though the assembler knows how to generate the symbol type.
1868 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1869 AC_DEFINE(HAVE_IFUNC)
1870 fi
1872 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1873 AC_DEFINE(HAVE_GCC_IFUNC)
1874 fi
1876 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1877 # configure fragment can override the value to prevent this AC_DEFINE.
1878 AC_SUBST(use_nscd)
1879 if test "x$use_nscd" != xno; then
1880 AC_DEFINE([USE_NSCD])
1881 fi
1882 if test "x$build_nscd" = xdefault; then
1883 build_nscd=$use_nscd
1884 fi
1886 AC_SUBST(libc_cv_slibdir)
1887 AC_SUBST(libc_cv_rtlddir)
1888 AC_SUBST(libc_cv_complocaledir)
1889 AC_SUBST(libc_cv_sysconfdir)
1890 AC_SUBST(libc_cv_localstatedir)
1891 AC_SUBST(libc_cv_rootsbindir)
1893 if test x$use_ldconfig = xyes; then
1894 AC_DEFINE(USE_LDCONFIG)
1895 fi
1896 AC_SUBST(use_ldconfig)
1897 AC_SUBST(ldd_rewrite_script)
1899 AC_SUBST(static)
1900 AC_SUBST(shared)
1902 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1903 [libc_cv_pic_default=yes
1904 cat > conftest.c <<EOF
1905 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1906 # error PIC is default.
1907 #endif
1908 EOF
1909 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1910 libc_cv_pic_default=no
1911 fi
1912 rm -f conftest.*])
1913 AC_SUBST(libc_cv_pic_default)
1915 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1916 [libc_cv_pie_default=yes
1917 cat > conftest.c <<EOF
1918 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1919 # error PIE is default.
1920 #endif
1921 EOF
1922 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1923 libc_cv_pie_default=no
1924 fi
1925 rm -f conftest.*])
1926 AC_SUBST(libc_cv_pie_default)
1928 AC_SUBST(profile)
1929 AC_SUBST(static_nss)
1931 AC_SUBST(DEFINES)
1933 dnl See sysdeps/mach/configure.ac for this variable.
1934 AC_SUBST(mach_interface_list)
1936 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1937 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1938 AC_SUBST(VERSION)
1939 AC_SUBST(RELEASE)
1941 AC_CONFIG_FILES([config.make Makefile])
1942 AC_CONFIG_COMMANDS([default],[[
1943 case $CONFIG_FILES in *config.make*)
1944 echo "$config_vars" >> config.make;;
1945 esac
1946 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1947 AC_OUTPUT