| blob | bd3e8296662f33799e11cc8fbf93540835858e7b |
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 # We need the C++ compiler only for testing.
54 AC_PROG_CXX
55 AC_CHECK_TOOL(READELF, readelf, false)
57 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
58 AC_MSG_ERROR([you must configure in a separate build directory])
59 fi
61 # This will get text that should go into config.make.
62 config_vars=
64 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
65 AC_ARG_WITH([gd],
66 AC_HELP_STRING([--with-gd=DIR],
67 [find libgd include dir and library with prefix DIR]),
68 [dnl
69 case "$with_gd" in
70 yes|''|no) ;;
71 *) libgd_include="-I$withval/include"
72 libgd_ldflags="-L$withval/lib" ;;
73 esac
74 ])
75 AC_ARG_WITH([gd-include],
76 AC_HELP_STRING([--with-gd-include=DIR],
77 [find libgd include files in DIR]),
78 [dnl
79 case "$with_gd_include" in
80 ''|no) ;;
81 *) libgd_include="-I$withval" ;;
82 esac
83 ])
84 AC_ARG_WITH([gd-lib],
85 AC_HELP_STRING([--with-gd-lib=DIR],
86 [find libgd library files in DIR]),
87 [dnl
88 case "$with_gd_lib" in
89 ''|no) ;;
90 *) libgd_ldflags="-L$withval" ;;
91 esac
92 ])
94 if test -n "$libgd_include"; then
95 config_vars="$config_vars
96 CFLAGS-memusagestat.c = $libgd_include"
97 fi
98 if test -n "$libgd_ldflags"; then
99 config_vars="$config_vars
100 libgd-LDFLAGS = $libgd_ldflags"
101 fi
103 dnl Arguments to specify presence of other packages/features.
104 AC_ARG_WITH([fp],
105 AC_HELP_STRING([--with-fp],
106 [if using floating-point hardware @<:@default=yes@:>@]),
107 [with_fp=$withval],
108 [with_fp=yes])
109 AC_SUBST(with_fp)
110 AC_ARG_WITH([binutils],
111 AC_HELP_STRING([--with-binutils=PATH],
112 [specify location of binutils (as and ld)]),
113 [path_binutils=$withval],
114 [path_binutils=''])
115 AC_ARG_WITH([selinux],
116 AC_HELP_STRING([--with-selinux],
117 [if building with SELinux support]),
118 [with_selinux=$withval],
119 [with_selinux=auto])
121 AC_ARG_WITH([headers],
122 AC_HELP_STRING([--with-headers=PATH],
123 [location of system headers to use
124 (for example /usr/src/linux/include)
125 @<:@default=compiler default@:>@]),
126 [sysheaders=$withval],
127 [sysheaders=''])
128 AC_SUBST(sysheaders)
130 AC_SUBST(use_default_link)
131 AC_ARG_WITH([default-link],
132 AC_HELP_STRING([--with-default-link],
133 [do not use explicit linker scripts]),
134 [use_default_link=$withval],
135 [use_default_link=default])
137 AC_ARG_ENABLE([sanity-checks],
138 AC_HELP_STRING([--disable-sanity-checks],
139 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
140 [enable_sanity=$enableval],
141 [enable_sanity=yes])
143 AC_ARG_ENABLE([shared],
144 AC_HELP_STRING([--enable-shared],
145 [build shared library @<:@default=yes if GNU ld@:>@]),
146 [shared=$enableval],
147 [shared=yes])
148 AC_ARG_ENABLE([profile],
149 AC_HELP_STRING([--enable-profile],
150 [build profiled library @<:@default=no@:>@]),
151 [profile=$enableval],
152 [profile=no])
154 AC_ARG_ENABLE([oldest-abi],
155 AC_HELP_STRING([--enable-oldest-abi=ABI],
156 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
157 [oldest_abi=$enableval],
158 [oldest_abi=no])
159 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
160 oldest_abi=default
161 else
162 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
163 fi
164 AC_SUBST(oldest_abi)
166 AC_ARG_ENABLE([hardcoded-path-in-tests],
167 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
168 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
169 [hardcoded_path_in_tests=$enableval],
170 [hardcoded_path_in_tests=no])
171 AC_SUBST(hardcoded_path_in_tests)
173 AC_ARG_ENABLE([stackguard-randomization],
174 AC_HELP_STRING([--enable-stackguard-randomization],
175 [initialize __stack_chk_guard canary with a random number at program start]),
176 [enable_stackguard_randomize=$enableval],
177 [enable_stackguard_randomize=no])
178 if test "$enable_stackguard_randomize" = yes; then
179 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
180 fi
182 AC_ARG_ENABLE([lock-elision],
183 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
184 [Enable lock elision for pthread mutexes by default]),
185 [enable_lock_elision=$enableval],
186 [enable_lock_elision=no])
187 AC_SUBST(enable_lock_elision)
188 if test "$enable_lock_elision" = yes ; then
189 AC_DEFINE(ENABLE_LOCK_ELISION)
190 fi
192 dnl Generic infrastructure for drop-in additions to libc.
193 AC_ARG_ENABLE([add-ons],
194 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
195 [configure and build add-ons in DIR1,DIR2,...
196 search for add-ons if no parameter given]),
197 , [enable_add_ons=yes])
199 AC_ARG_ENABLE([hidden-plt],
200 AC_HELP_STRING([--disable-hidden-plt],
201 [do not hide internal function calls to avoid PLT]),
202 [hidden=$enableval],
203 [hidden=yes])
204 if test "x$hidden" = xno; then
205 AC_DEFINE(NO_HIDDEN)
206 fi
208 AC_ARG_ENABLE([bind-now],
209 AC_HELP_STRING([--enable-bind-now],
210 [disable lazy relocations in DSOs]),
211 [bindnow=$enableval],
212 [bindnow=no])
213 AC_SUBST(bindnow)
215 dnl On some platforms we cannot use dynamic loading. We must provide
216 dnl static NSS modules.
217 AC_ARG_ENABLE([static-nss],
218 AC_HELP_STRING([--enable-static-nss],
219 [build static NSS modules @<:@default=no@:>@]),
220 [static_nss=$enableval],
221 [static_nss=no])
222 dnl Enable static NSS also if we build no shared objects.
223 if test x"$static_nss" = xyes || test x"$shared" = xno; then
224 static_nss=yes
225 AC_DEFINE(DO_STATIC_NSS)
226 fi
228 AC_ARG_ENABLE([force-install],
229 AC_HELP_STRING([--disable-force-install],
230 [don't force installation of files from this package, even if they are older than the installed files]),
231 [force_install=$enableval],
232 [force_install=yes])
233 AC_SUBST(force_install)
235 AC_ARG_ENABLE([maintainer-mode],
236 AC_HELP_STRING([--enable-maintainer-mode],
237 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
238 [maintainer=$enableval],
239 [maintainer=no])
241 dnl On some platforms we allow dropping compatibility with all kernel
242 dnl versions.
243 AC_ARG_ENABLE([kernel],
244 AC_HELP_STRING([--enable-kernel=VERSION],
245 [compile for compatibility with kernel not older than VERSION]),
246 [minimum_kernel=$enableval],
247 [])
248 dnl Prevent unreasonable values.
249 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
250 # Better nothing than this.
251 minimum_kernel=""
252 else
253 if test "$minimum_kernel" = current; then
254 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
255 fi
256 fi
258 dnl For the development we sometimes want gcc to issue even more warnings.
259 dnl This is not the default since many of the extra warnings are not
260 dnl appropriate.
261 AC_ARG_ENABLE([all-warnings],
262 AC_HELP_STRING([--enable-all-warnings],
263 [enable all useful warnings gcc can issue]),
264 [all_warnings=$enableval],
265 [])
266 AC_SUBST(all_warnings)
268 AC_ARG_ENABLE([multi-arch],
269 AC_HELP_STRING([--enable-multi-arch],
270 [enable single DSO with optimizations for multiple architectures]),
271 [multi_arch=$enableval],
272 [multi_arch=default])
274 AC_ARG_ENABLE([nss-crypt],
275 AC_HELP_STRING([--enable-nss-crypt],
276 [enable libcrypt to use nss]),
277 [nss_crypt=$enableval],
278 [nss_crypt=no])
279 if test x$nss_crypt = xyes; then
280 nss_includes=-I$(nss-config --includedir 2>/dev/null)
281 if test $? -ne 0; then
282 AC_MSG_ERROR([cannot find include directory with nss-config])
283 fi
284 old_CFLAGS="$CFLAGS"
285 CFLAGS="$CFLAGS $nss_includes"
286 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
287 #include <hasht.h>
288 #include <nsslowhash.h>
289 void f (void) { NSSLOW_Init (); }])],
290 libc_cv_nss_crypt=yes,
291 AC_MSG_ERROR([
292 cannot find NSS headers with lowlevel hash function interfaces]))
293 old_LIBS="$LIBS"
294 LIBS="$LIBS -lfreebl3"
295 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
296 #include <hasht.h>
297 #include <nsslowhash.h>],
298 [NSSLOW_Init();])],
299 libc_cv_nss_crypt=yes,
300 AC_MSG_ERROR([
301 cannot link program using lowlevel NSS hash functions]))
302 CFLAGS="$old_CFLAGS"
303 LIBS="$old_LIBS"
304 else
305 libc_cv_nss_crypt=no
306 fi
307 AC_SUBST(libc_cv_nss_crypt)
310 AC_ARG_ENABLE([obsolete-rpc],
311 AC_HELP_STRING([--enable-obsolete-rpc],
312 [build and install the obsolete RPC code for link-time usage]),
313 [link_obsolete_rpc=$enableval],
314 [link_obsolete_rpc=no])
315 AC_SUBST(link_obsolete_rpc)
317 if test "$link_obsolete_rpc" = yes; then
318 AC_DEFINE(LINK_OBSOLETE_RPC)
319 fi
321 AC_ARG_ENABLE([systemtap],
322 [AS_HELP_STRING([--enable-systemtap],
323 [enable systemtap static probe points @<:@default=no@:>@])],
324 [systemtap=$enableval],
325 [systemtap=no])
326 if test "x$systemtap" != xno; then
327 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
328 old_CFLAGS="$CFLAGS"
329 CFLAGS="-std=gnu99 $CFLAGS"
330 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
331 void foo (int i, void *p)
332 {
333 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
334 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
335 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
336 CFLAGS="$old_CFLAGS"])
337 if test $libc_cv_sdt = yes; then
338 AC_DEFINE([USE_STAP_PROBE])
339 elif test "x$systemtap" != xauto; then
340 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
341 fi
342 fi
344 AC_ARG_ENABLE([build-nscd],
345 [AS_HELP_STRING([--disable-build-nscd],
346 [disable building and installing the nscd daemon])],
347 [build_nscd=$enableval],
348 [build_nscd=default])
349 AC_SUBST(build_nscd)
351 # Note the use of $use_nscd is near the bottom of the file.
352 AC_ARG_ENABLE([nscd],
353 [AS_HELP_STRING([--disable-nscd],
354 [library functions will not contact the nscd daemon])],
355 [use_nscd=$enableval],
356 [use_nscd=yes])
358 AC_ARG_ENABLE([pt_chown],
359 [AS_HELP_STRING([--enable-pt_chown],
360 [Enable building and installing pt_chown])],
361 [build_pt_chown=$enableval],
362 [build_pt_chown=no])
363 AC_SUBST(build_pt_chown)
364 if test "$build_pt_chown" = yes; then
365 AC_DEFINE(HAVE_PT_CHOWN)
366 fi
368 # The way shlib-versions is used to generate soversions.mk uses a
369 # fairly simplistic model for name recognition that can't distinguish
370 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
371 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
372 # tell. This doesn't get used much beyond that, so it's fairly safe.
373 case "$host_os" in
374 linux*)
375 ;;
376 gnu*)
377 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
378 ;;
379 esac
381 # We keep the original values in `$config_*' and never modify them, so we
382 # can write them unchanged into config.make. Everything else uses
383 # $machine, $vendor, and $os, and changes them whenever convenient.
384 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
386 # Don't allow vendor == "unknown"
387 test "$config_vendor" = unknown && config_vendor=
388 config_os="`echo $config_os | sed 's/^unknown-//'`"
390 # Some configurations imply other options.
391 elf=yes
393 # The configure fragment of an add-on port can modify these to supplement
394 # or override the table in the case statement below. No fragment should
395 # ever change the config_* variables, however.
396 machine=$config_machine
397 vendor=$config_vendor
398 os=$config_os
399 base_os=''
401 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
402 # Unify this here.
403 if test "$machine" = rs6000; then
404 machine="powerpc"
405 fi
407 # Braindead PowerPC box with absolutely no FPU.
408 case "$machine-$host_os" in
409 powerpc*-*soft)
410 with_fp=no
411 ;;
412 esac
414 submachine=
415 AC_ARG_WITH([cpu],
416 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
417 [dnl
418 case "$withval" in
419 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
420 no) ;;
421 *) submachine="$withval" ;;
422 esac
423 ])
425 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
426 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
428 # An add-on can set this when it wants to disable the sanity check below.
429 libc_config_ok=no
431 dnl Having this here, though empty, makes sure that if add-ons' fragments
432 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
433 dnl our AC_OUTPUT will actually use it.
434 AC_CONFIG_SUBDIRS()
436 case "$enable_add_ons" in
437 ''|no) add_ons= ;;
438 yes|'*')
439 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
440 sed 's@/[[^/]]*$@@' | sort | uniq`
441 add_ons_automatic=yes
442 ;;
443 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
444 add_ons_automatic=no ;;
445 esac
447 configured_add_ons=
448 add_ons_sfx=
449 add_ons_pfx=
450 if test x"$add_ons" != x; then
451 for f in $add_ons; do
452 # Some sanity checks
453 case "$f" in
454 crypt)
455 AC_MSG_ERROR([
456 *** It seems that you're using an old \`crypt' add-on. crypt is now
457 *** part of glibc and using the old add-on will not work with this
458 *** release. Start again with fresh sources and without the old
459 *** \`crypt' add-on.])
460 ;;
461 localedata)
462 AC_MSG_ERROR([
463 *** It seems that you're using an old \`localedata' add-on. localedata
464 *** is now part of glibc and using the old add-on will not work with
465 *** this release. Start again with fresh sources and without the old
466 *** \`localedata' add-on.])
467 ;;
468 esac
469 done
471 # Now source each add-on's configure fragment.
472 # The fragments can use $srcdir/$libc_add_on to find themselves,
473 # and test $add_ons_automatic to see if they were explicitly requested.
474 # A fragment can clear (or even change) $libc_add_on to affect
475 # whether it goes into the list to be actually used in the build.
476 use_add_ons=
477 for libc_add_on in $add_ons; do
478 # Test whether such a directory really exists.
479 # It can be absolute, or relative to $srcdir, or relative to the build dir.
480 case "$libc_add_on" in
481 /*)
482 libc_add_on_srcdir=$libc_add_on
483 ;;
484 *)
485 test -d "$srcdir/$libc_add_on" || {
486 if test -d "$libc_add_on"; then
487 libc_add_on="`pwd`/$libc_add_on"
488 else
489 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
490 fi
491 }
492 libc_add_on_srcdir=$srcdir/$libc_add_on
493 ;;
494 esac
496 libc_add_on_frag=$libc_add_on_srcdir/configure
497 libc_add_on_canonical=
498 libc_add_on_config_subdirs=
499 if test -r "$libc_add_on_frag"; then
500 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
501 libc_add_on_canonical=unknown
502 libc_add_on_subdirs=
503 . "$libc_add_on_frag"
504 test -z "$libc_add_on" || {
505 configured_add_ons="$configured_add_ons $libc_add_on"
506 if test "x$libc_add_on_canonical" = xunknown; then
507 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
508 fi
509 for d in $libc_add_on_subdirs; do
510 case "$libc_add_on" in
511 /*) subdir_srcdir="$libc_add_on" ;;
512 *) subdir_srcdir="\$(..)$libc_add_on" ;;
513 esac
514 case "$d" in
515 .)
516 d="${libc_add_on_canonical:-$libc_add_on}"
517 ;;
518 /*)
519 subdir_srcdir="$d"
520 ;;
521 *)
522 subdir_srcdir="$subdir_srcdir/$d"
523 ;;
524 esac
525 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
526 add_on_subdirs="$add_on_subdirs $d"
527 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
528 $d-srcdir = $subdir_srcdir"
529 done
530 for d in $libc_add_on_config_subdirs; do
531 case "$d" in
532 /*) AC_MSG_ERROR(dnl
533 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
534 esac
535 if test ! -d "$libc_add_on_srcdir/$d"; then
536 AC_MSG_ERROR(fragment wants to configure missing directory $d)
537 fi
538 case "$libc_add_on" in
539 /*) AC_MSG_ERROR(dnl
540 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
541 esac
542 subdirs="$subdirs $libc_add_on/$d"
543 done
544 }
545 fi
546 if test -n "$libc_add_on"; then
547 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
548 use_add_ons="$use_add_ons $libc_add_on"
549 add_ons_pfx="$add_ons_pfx $libc_add_on/"
550 test -z "$libc_add_on_canonical" ||
551 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
552 fi
553 done
554 # Use echo to strip excess whitespace.
555 add_ons="`echo $use_add_ons`"
556 fi
557 AC_SUBST(add_ons)
558 AC_SUBST(add_on_subdirs)
561 ###
562 ### I put this here to prevent those annoying emails from people who cannot
563 ### read and try to compile glibc on unsupported platforms. --drepper
564 ###
565 ### By using the undocumented --enable-hacker-mode option for configure
566 ### one can skip this test to make the configuration not fail for unsupported
567 ### platforms.
568 ###
569 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
570 case "$machine-$host_os" in
571 *-linux* | *-gnu*)
572 ;;
573 *)
574 echo "*** The GNU C library is currently not available for this platform."
575 echo "*** So far nobody cared to port it and if there is no volunteer it"
576 echo "*** might never happen. So, if you have interest to see glibc on"
577 echo "*** this platform visit"
578 echo "*** http://www.gnu.org/software/libc/porting.html"
579 echo "*** and join the group of porters"
580 exit 1
581 ;;
582 esac
583 fi
585 # Set base_machine if not set by a preconfigure fragment.
586 test -n "$base_machine" || base_machine=$machine
587 AC_SUBST(base_machine)
589 # For the multi-arch option we need support in the assembler & linker.
590 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
591 libc_cv_ld_gnu_indirect_function, [dnl
592 cat > conftest.S <<EOF
593 .type foo,%gnu_indirect_function
594 foo:
595 .globl _start
596 _start:
597 .globl __start
598 __start:
599 .data
600 #ifdef _LP64
601 .quad foo
602 #else
603 .long foo
604 #endif
605 EOF
606 libc_cv_ld_gnu_indirect_function=no
607 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
608 -nostartfiles -nostdlib \
609 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
610 # Do a link to see if the backend supports IFUNC relocs.
611 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
612 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
613 libc_cv_ld_gnu_indirect_function=yes
614 }
615 fi
616 rm -f conftest*])
618 AC_MSG_CHECKING(whether .text pseudo-op must be used)
619 AC_CACHE_VAL(libc_cv_dot_text, [dnl
620 cat > conftest.s <<EOF
621 .text
622 EOF
623 libc_cv_dot_text=
624 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
625 libc_cv_dot_text=.text
626 fi
627 rm -f conftest*])
628 if test -z "$libc_cv_dot_text"; then
629 AC_MSG_RESULT(no)
630 else
631 AC_MSG_RESULT(yes)
632 fi
634 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
635 if test x"$multi_arch" = xyes; then
636 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
637 else
638 multi_arch=no
639 fi
640 fi
641 multi_arch_d=
642 if test x"$multi_arch" != xno; then
643 multi_arch_d=/multiarch
644 fi
646 # Compute the list of sysdep directories for this configuration.
647 # This can take a while to compute.
648 sysdep_dir=$srcdir/sysdeps
649 AC_MSG_CHECKING(sysdep dirs)
650 dnl We need to use [ and ] for other purposes for a while now.
651 changequote(,)dnl
652 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
653 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
655 test "x$base_os" != x || case "$os" in
656 gnu*)
657 base_os=mach/hurd ;;
658 linux*)
659 base_os=unix/sysv ;;
660 esac
662 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
663 tail=$os
664 ostry=$os
665 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
666 ostry="$ostry /$o"
667 tail=$o
668 done
669 o=`echo $tail | sed 's/[0-9]*$//'`
670 if test $o != $tail; then
671 ostry="$ostry /$o"
672 fi
673 # For linux-gnu, try linux-gnu, then linux.
674 o=`echo $tail | sed 's/-.*$//'`
675 if test $o != $tail; then
676 ostry="$ostry /$o"
677 fi
679 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
680 base=
681 tail=$base_os
682 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
683 set $b
684 base="$base /$1"
685 tail="$2"
686 done
688 # For sparc/sparc32, try sparc/sparc32 and then sparc.
689 mach=
690 tail=$machine${submachine:+/$submachine}
691 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
692 set $m
693 # Prepend the machine's FPU directory unless --without-fp.
694 if test "$with_fp" = yes; then
695 maybe_fpu=/fpu
696 else
697 maybe_fpu=/nofpu
698 fi
699 # For each machine term, try it with and then without /multiarch.
700 for try_fpu in $maybe_fpu ''; do
701 for try_multi in $multi_arch_d ''; do
702 mach="$mach /$1$try_fpu$try_multi"
703 done
704 done
705 tail="$2"
706 done
708 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
709 changequote([,])dnl
711 # Find what sysdep directories exist.
712 sysnames_add_ons=
713 sysnames=
714 for b in $base ''; do
715 for m0 in $mach ''; do
716 for v in /$vendor ''; do
717 test "$v" = / && continue
718 for o in /$ostry ''; do
719 test "$o" = / && continue
720 for m in $mach ''; do
721 for d in $add_ons_pfx ''; do
722 for a in $add_ons_sfx ''; do
723 try_suffix="$m0$b$v$o$m"
724 if test -n "$try_suffix"; then
725 try_srcdir="${srcdir}/"
726 case "$d" in
727 /*) try_srcdir= ;;
728 esac
729 try="${d}sysdeps$try_suffix$a"
730 test -n "$enable_debug_configure" &&
731 echo "$0 [DEBUG]: try $try" >&2
732 if test -d "$try_srcdir$try"; then
733 sysnames="$sysnames $try"
734 { test -n "$o" || test -n "$b"; } && os_used=t
735 { test -n "$m" || test -n "$m0"; } && machine_used=t
736 case x${m0:-$m} in
737 x*/$submachine) submachine_used=t ;;
738 esac
739 if test -n "$d"; then
740 case "$sysnames_add_ons" in
741 *" $d "*) ;;
742 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
743 esac
744 fi
745 fi
746 fi
747 done
748 done
749 done
750 done
751 done
752 done
753 done
755 # If the assembler supports gnu_indirect_function symbol type and the
756 # architecture supports multi-arch, we enable multi-arch by default.
757 case $sysnames_add_ons$sysnames in
758 *"$multi_arch_d"*)
759 ;;
760 *)
761 test x"$multi_arch" = xdefault && multi_arch=no
762 ;;
763 esac
764 if test x"$multi_arch" != xno; then
765 AC_DEFINE(USE_MULTIARCH)
766 fi
767 AC_SUBST(multi_arch)
769 if test -z "$os_used" && test "$os" != none; then
770 AC_MSG_ERROR(Operating system $os is not supported.)
771 fi
772 if test -z "$machine_used" && test "$machine" != none; then
773 AC_MSG_ERROR(The $machine is not supported.)
774 fi
775 if test -z "$submachine_used" && test -n "$submachine"; then
776 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
777 fi
778 AC_SUBST(submachine)
780 # We have now validated the configuration.
782 # Expand the list of system names into a full list of directories
783 # from each element's parent name and Implies file (if present).
784 set $sysnames
785 names=
786 while test $# -gt 0; do
787 name=$1
788 shift
790 case " $names " in *" $name "*)
791 # Already in the list.
792 continue
793 esac
795 # Report each name as we discover it, so there is no long pause in output.
796 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
798 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
800 case $name in
801 /*) xsrcdir= ;;
802 *) xsrcdir=$srcdir/ ;;
803 esac
804 test -n "$enable_debug_configure" &&
805 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
807 for implies_file in Implies Implies-before Implies-after; do
808 implies_type=`echo $implies_file | sed s/-/_/`
809 eval ${implies_type}=
810 if test -f $xsrcdir$name/$implies_file; then
811 # Collect more names from the `Implies' file (removing comments).
812 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
813 for x in $implied_candidate; do
814 found=no
815 if test -d $xsrcdir$name_base/$x; then
816 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
817 found=yes
818 fi
819 for d in $add_ons_pfx ''; do
820 try="${d}sysdeps/$x"
821 case $d in
822 /*) try_srcdir= ;;
823 *) try_srcdir=$srcdir/ ;;
824 esac
825 test -n "$enable_debug_configure" &&
826 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
827 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
828 then
829 eval "${implies_type}=\"\$${implies_type} \$try\""
830 found=yes
831 case "$sysnames_add_ons" in
832 *" $d "*) ;;
833 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
834 esac
835 fi
836 done
837 if test $found = no; then
838 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
839 fi
840 done
841 fi
842 done
844 # Add NAME to the list of names.
845 names="$names $name"
847 # Find the parent of NAME, using the empty string if it has none.
848 changequote(,)dnl
849 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
850 changequote([,])dnl
852 test -n "$enable_debug_configure" &&
853 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
854 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
856 # Add the names implied by NAME, and NAME's parent (if it has one), to
857 # the list of names to be processed (the argument list). We prepend the
858 # implied names to the list and append the parent. We want implied
859 # directories to come before further directories inferred from the
860 # configuration components; this ensures that for sysv4, unix/common
861 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
862 # after sysv4).
863 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
864 test -n "$sysnames" && set $sysnames
865 done
867 # Add the default directories.
868 default_sysnames="sysdeps/generic"
869 sysnames="$names $default_sysnames"
870 AC_SUBST(sysnames)
871 # The other names were emitted during the scan.
872 AC_MSG_RESULT($default_sysnames)
874 # Collect the list of add-ons that supply partial sysdeps trees.
875 sysdeps_add_ons=
876 for add_on in $add_ons; do
877 case "$add_on" in
878 /*) xsrcdir= ;;
879 *) xsrcdir="$srcdir/" ;;
880 esac
882 test -d "$xsrcdir$add_on/sysdeps" || {
883 case "$configured_add_ons " in
884 *" $add_on "*) ;;
885 *|'')
886 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
887 ;;
888 esac
889 continue
890 }
892 sysdeps_add_ons="$sysdeps_add_ons $add_on"
893 case "$sysnames_add_ons" in
894 *" $add_on/ "*) ;;
895 *|'')
896 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
897 continue ;;
898 esac
900 found=no
901 for d in $sysnames; do
902 case "$d" in
903 $add_on/sysdeps/*) ;;
904 *) continue ;;
905 esac
906 (cd "$xsrcdir$d" && for f in *[[!~]]; do
907 case "$f" in
908 sys|bits)
909 for ff in $f/*.h; do
910 test -d "$ff" || { test -e "$ff" && exit 88; }
911 done
912 ;;
913 *)
914 test -d "$f" || { test -e "$f" && exit 88; }
915 ;;
916 esac
917 done)
918 if test $? -eq 88; then
919 found=yes
920 break
921 fi
922 done
923 if test $found = no; then
924 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
925 fi
926 done
927 AC_SUBST(sysdeps_add_ons)
930 ### Locate tools.
932 AC_PROG_INSTALL
933 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
934 # The makefiles need to use a different form to find it in $srcdir.
935 INSTALL='\$(..)./scripts/install-sh -c'
936 fi
937 AC_PROG_LN_S
939 LIBC_PROG_BINUTILS
941 # Accept binutils 2.20 or newer.
942 AC_CHECK_PROG_VER(AS, $AS, --version,
943 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
944 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
945 AC_CHECK_PROG_VER(LD, $LD, --version,
946 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
947 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
949 # These programs are version sensitive.
950 AC_CHECK_TOOL_PREFIX
951 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
952 [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
953 critic_missing="$critic_missing gcc")
954 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
955 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
956 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
958 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
959 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
960 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
961 MSGFMT=: aux_missing="$aux_missing msgfmt")
962 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
963 [GNU texinfo.* \([0-9][0-9.]*\)],
964 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
965 MAKEINFO=: aux_missing="$aux_missing makeinfo")
966 AC_CHECK_PROG_VER(SED, sed, --version,
967 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
968 [3.0[2-9]*|3.[1-9]*|[4-9]*],
969 SED=: aux_missing="$aux_missing sed")
970 AC_CHECK_PROG_VER(AWK, gawk, --version,
971 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
972 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
974 AC_CHECK_TOOL(NM, nm, false)
976 if test "x$maintainer" = "xyes"; then
977 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
978 case "x$AUTOCONF" in
979 xno|x|x:) AUTOCONF=no ;;
980 *)
981 AC_CACHE_CHECK(dnl
982 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
983 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
984 libc_cv_autoconf_works=yes
985 else
986 libc_cv_autoconf_works=no
987 fi])
988 test $libc_cv_autoconf_works = yes || AUTOCONF=no
989 ;;
990 esac
991 if test "x$AUTOCONF" = xno; then
992 aux_missing="$aux_missing autoconf"
993 fi
994 else
995 AUTOCONF=no
996 fi
998 test -n "$critic_missing" && AC_MSG_ERROR([
999 *** These critical programs are missing or too old:$critic_missing
1000 *** Check the INSTALL file for required versions.])
1002 test -n "$aux_missing" && AC_MSG_WARN([
1003 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1004 *** some features will be disabled.
1005 *** Check the INSTALL file for required versions.])
1007 # if using special system headers, find out the compiler's sekrit
1008 # header directory and add that to the list. NOTE: Only does the right
1009 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1010 if test -n "$sysheaders"; then
1011 SYSINCLUDES=-nostdinc
1012 for d in include include-fixed; do
1013 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1014 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1015 done
1016 SYSINCLUDES="$SYSINCLUDES \
1017 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1018 if test -n "$CXX"; then
1019 CXX_SYSINCLUDES=
1020 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1021 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1022 test "x$cxxheaders" != x &&
1023 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1024 done
1025 fi
1026 fi
1027 AC_SUBST(SYSINCLUDES)
1028 AC_SUBST(CXX_SYSINCLUDES)
1030 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1031 # since this would lead to problems installing/building glibc.
1032 # LD_LIBRARY_PATH contains the current directory if one of the following
1033 # is true:
1034 # - one of the terminals (":" and ";") is the first or last sign
1035 # - two terminals occur directly after each other
1036 # - the path contains an element with a dot in it
1037 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1038 changequote(,)dnl
1039 case ${LD_LIBRARY_PATH} in
1040 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1041 ld_library_path_setting="contains current directory"
1042 ;;
1043 *)
1044 ld_library_path_setting="ok"
1045 ;;
1046 esac
1047 changequote([,])dnl
1048 AC_MSG_RESULT($ld_library_path_setting)
1049 if test "$ld_library_path_setting" != "ok"; then
1050 AC_MSG_ERROR([
1051 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1052 *** building glibc. Please change the environment variable
1053 *** and run configure again.])
1054 fi
1056 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1057 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1058 libc_cv_gcc_static_libgcc=
1059 else
1060 libc_cv_gcc_static_libgcc=-static-libgcc
1061 fi])
1062 AC_SUBST(libc_cv_gcc_static_libgcc)
1064 AC_PATH_PROG(BASH_SHELL, bash, no)
1066 AC_PATH_PROG(PERL, perl, no)
1067 if test "$PERL" != no &&
1068 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1069 PERL=no
1070 fi
1071 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1072 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1073 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1075 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1076 AC_TRY_COMPILE(dnl
1077 [#define __need_size_t
1078 #define __need_wchar_t
1079 #include <stddef.h>
1080 #define __need_NULL
1081 #include <stddef.h>], [size_t size; wchar_t wchar;
1082 #ifdef offsetof
1083 #error stddef.h ignored __need_*
1084 #endif
1085 if (&size == NULL || &wchar == NULL) abort ();],
1086 libc_cv_friendly_stddef=yes,
1087 libc_cv_friendly_stddef=no)])
1088 if test $libc_cv_friendly_stddef = yes; then
1089 config_vars="$config_vars
1090 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1091 fi
1093 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1094 libc_cv_need_minus_P, [dnl
1095 cat > conftest.S <<EOF
1096 #include "confdefs.h"
1097 /* Nothing whatsoever. */
1098 EOF
1099 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1100 libc_cv_need_minus_P=no
1101 else
1102 libc_cv_need_minus_P=yes
1103 fi
1104 rm -f conftest*])
1105 if test $libc_cv_need_minus_P = yes; then
1106 config_vars="$config_vars
1107 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1108 fi
1110 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1111 cat > conftest.s <<EOF
1112 ${libc_cv_dot_text}
1113 foo:
1114 .set glibc_conftest_frobozz,foo
1115 .globl glibc_conftest_frobozz
1116 EOF
1117 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1118 # (but it doesn't work), so we must do a linking check to be sure.
1119 cat > conftest1.c <<\EOF
1120 extern int glibc_conftest_frobozz;
1121 void _start() { glibc_conftest_frobozz = 1; }
1122 EOF
1123 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1124 -nostartfiles -nostdlib \
1125 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1126 libc_cv_asm_set_directive=yes
1127 else
1128 libc_cv_asm_set_directive=no
1129 fi
1130 rm -f conftest*])
1131 if test $libc_cv_asm_set_directive = yes; then
1132 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1133 fi
1135 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1136 libc_cv_asm_unique_object, [dnl
1137 cat > conftest.s <<EOF
1138 ${libc_cv_dot_text}
1139 _sym:
1140 .type _sym, %gnu_unique_object
1141 EOF
1142 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1143 libc_cv_asm_unique_object=yes
1144 else
1145 libc_cv_asm_unique_object=no
1146 fi
1147 rm -f conftest*])
1148 if test $libc_cv_asm_unique_object = yes; then
1149 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1150 fi
1152 AC_CACHE_CHECK(for .previous assembler directive,
1153 libc_cv_asm_previous_directive, [dnl
1154 cat > conftest.s <<EOF
1155 .section foo_section
1156 .previous
1157 EOF
1158 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1159 libc_cv_asm_previous_directive=yes
1160 else
1161 libc_cv_asm_previous_directive=no
1162 fi
1163 rm -f conftest*])
1164 if test $libc_cv_asm_previous_directive = yes; then
1165 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1166 else
1167 AC_CACHE_CHECK(for .popsection assembler directive,
1168 libc_cv_asm_popsection_directive, [dnl
1169 cat > conftest.s <<EOF
1170 .pushsection foo_section
1171 .popsection
1172 EOF
1173 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1174 libc_cv_asm_popsection_directive=yes
1175 else
1176 libc_cv_asm_popsection_directive=no
1177 fi
1178 rm -f conftest*])
1179 if test $libc_cv_asm_popsection_directive = yes; then
1180 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1181 fi
1182 fi
1183 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1184 libc_cv_asm_protected_directive, [dnl
1185 cat > conftest.s <<EOF
1186 .protected foo
1187 foo:
1188 .hidden bar
1189 bar:
1190 EOF
1191 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1192 libc_cv_asm_protected_directive=yes
1193 else
1194 AC_MSG_ERROR(assembler support for symbol visibility is required)
1195 fi
1196 rm -f conftest*])
1198 if test $libc_cv_asm_protected_directive = yes; then
1199 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1200 libc_cv_visibility_attribute,
1201 [cat > conftest.c <<EOF
1202 int foo __attribute__ ((visibility ("hidden"))) = 1;
1203 int bar __attribute__ ((visibility ("protected"))) = 1;
1204 EOF
1205 libc_cv_visibility_attribute=no
1206 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1207 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1208 if grep '\.protected.*bar' conftest.s >/dev/null; then
1209 libc_cv_visibility_attribute=yes
1210 fi
1211 fi
1212 fi
1213 rm -f conftest.{c,s}
1214 ])
1215 if test $libc_cv_visibility_attribute != yes; then
1216 AC_MSG_ERROR(compiler support for visibility attribute is required)
1217 fi
1218 fi
1220 if test $libc_cv_visibility_attribute = yes; then
1221 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1222 libc_cv_broken_visibility_attribute,
1223 [cat > conftest.c <<EOF
1224 int foo (int x);
1225 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1226 int bar (int x) { return x; }
1227 EOF
1228 libc_cv_broken_visibility_attribute=yes
1229 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1230 changequote(,)dnl
1231 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1232 changequote([,])dnl
1233 libc_cv_broken_visibility_attribute=no
1234 fi
1235 fi
1236 rm -f conftest.c conftest.s
1237 ])
1238 if test $libc_cv_broken_visibility_attribute = yes; then
1239 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1240 fi
1241 fi
1243 AC_CACHE_CHECK(for broken __attribute__((alias())),
1244 libc_cv_broken_alias_attribute,
1245 [cat > conftest.c <<EOF
1246 extern int foo (int x) __asm ("xyzzy");
1247 int bar (int x) { return x; }
1248 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1249 extern int dfoo;
1250 extern __typeof (dfoo) dfoo __asm ("abccb");
1251 int dfoo = 1;
1252 EOF
1253 libc_cv_broken_alias_attribute=yes
1254 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1255 if grep 'xyzzy' conftest.s >/dev/null &&
1256 grep 'abccb' conftest.s >/dev/null; then
1257 libc_cv_broken_alias_attribute=no
1258 fi
1259 fi
1260 rm -f conftest.c conftest.s
1261 ])
1262 if test $libc_cv_broken_alias_attribute = yes; then
1263 AC_MSG_ERROR(working alias attribute support required)
1264 fi
1266 if test $libc_cv_visibility_attribute = yes; then
1267 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1268 libc_cv_have_sdata_section,
1269 [echo "int i;" > conftest.c
1270 libc_cv_have_sdata_section=no
1271 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1272 | grep '\.sdata' >/dev/null; then
1273 libc_cv_have_sdata_section=yes
1274 fi
1275 rm -f conftest.c conftest.so
1276 ])
1277 if test $libc_cv_have_sdata_section = yes; then
1278 AC_DEFINE(HAVE_SDATA_SECTION)
1279 fi
1280 fi
1282 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1283 libc_cv_initfini_array, [dnl
1284 LIBC_TRY_LINK_STATIC([
1285 int foo (void) { return 1; }
1286 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1287 ],
1288 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1289 libc_cv_initfini_array=yes
1290 else
1291 libc_cv_initfini_array=no
1292 fi],
1293 [libc_cv_initfini_array=no])
1294 ])
1295 if test $libc_cv_initfini_array != yes; then
1296 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1297 fi
1299 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1300 libc_cv_ctors_header, [dnl
1301 libc_cv_ctors_header=yes
1302 LIBC_TRY_LINK_STATIC([
1303 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1304 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1305 ],
1306 [dnl
1307 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1308 { gsub(/\@<:@ */, "@<:@") }
1309 $2 == ".ctors" || $2 == ".dtors" {
1310 size = strtonum("0x" $6)
1311 align = strtonum("0x" $NF)
1312 seen@<:@$2@:>@ = 1
1313 stub@<:@$2@:>@ = size == align * 2
1314 }
1315 END {
1316 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1317 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1318 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1319 }
1320 '], [libc_cv_ctors_header=no])
1321 ], [dnl
1322 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1323 ])
1324 ])
1325 if test $libc_cv_ctors_header = no; then
1326 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1327 fi
1329 AC_CACHE_CHECK(for libunwind-support in compiler,
1330 libc_cv_cc_with_libunwind, [
1331 cat > conftest.c <<EOF
1332 int main (void) { return 0; }
1333 EOF
1334 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1335 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1336 libc_cv_cc_with_libunwind=yes
1337 else
1338 libc_cv_cc_with_libunwind=no
1339 fi
1340 rm -f conftest*])
1341 AC_SUBST(libc_cv_cc_with_libunwind)
1342 if test $libc_cv_cc_with_libunwind = yes; then
1343 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1344 fi
1346 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1347 [libc_cv_z_nodelete=yes],
1348 [AC_MSG_ERROR(linker with -z nodelete support required)])
1350 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1351 [libc_cv_z_nodlopen=yes],
1352 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1354 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1355 [libc_cv_z_initfirst=yes],
1356 [AC_MSG_ERROR(linker with -z initfirst support required)])
1358 # Add-on fragments can set these for other machines.
1359 libc_commonpagesize=${libc_commonpagesize:-no}
1360 libc_relro_required=${libc_relro_required:-no}
1361 case "$base_machine" in
1362 i[[34567]]86 | x86_64 | powerpc* | s390*)
1363 libc_commonpagesize=0x1000
1364 libc_relro_required=yes
1365 ;;
1366 sparc*)
1367 libc_commonpagesize=0x2000
1368 libc_relro_required=yes
1369 ;;
1370 esac
1372 if test $libc_commonpagesize != no; then
1373 AC_CACHE_CHECK(for -z relro option,
1374 libc_cv_z_relro, [dnl
1375 libc_cv_z_relro=no
1376 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1377 int _start (void) { return 42; }
1378 extern void _exit (int);
1379 /* Since these pointers are const, they should go in rodata.
1380 Since they refer to functions that have to be resolved by
1381 dynamic linking, they should instead go in RELRO data. */
1382 const void *const relro[] = { &_start, &_exit, 0 };
1383 /* GNU ld fails to produce RELRO data when it's very small and there is no
1384 normal writable data following it, or if only uninitialized (.bss) data
1385 follows it, or only very small writable data. */
1386 int data[0x10000] = { 1, };
1387 ]])])
1388 cat > conftest.awk <<\EOF
1389 BEGIN {
1390 result = "no"
1391 commonpagesize = strtonum(commonpagesize)
1392 }
1393 { print "LINE:", $0 > "/dev/stderr" }
1394 $1 == "GNU_RELRO" {
1395 vaddr = strtonum($3)
1396 memsz = strtonum($6)
1397 end = vaddr + memsz
1398 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1399 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1400 result = (end % commonpagesize == 0) ? "yes" : "broken"
1401 }
1402 END { print result }
1403 EOF
1404 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1405 -fPIC -shared -o conftest.so conftest.c
1406 -nostartfiles -nostdlib
1407 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1408 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1409 AC_TRY_COMMAND([
1410 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1411 conftest.ph > conftest.cps
1412 ]) &&
1413 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1414 rm -f conftest*])
1415 if { test "x$libc_relro_required" = xyes &&
1416 test "x$libc_cv_z_relro" != xyes
1417 }
1418 then
1419 AC_MSG_ERROR(linker with -z relro support required)
1420 fi
1421 else
1422 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1423 fi
1425 AC_CACHE_CHECK(for -Bgroup option,
1426 libc_cv_Bgroup, [dnl
1427 cat > conftest.c <<EOF
1428 int _start (void) { return 42; }
1429 EOF
1430 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1431 -fPIC -shared -o conftest.so conftest.c
1432 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1433 then
1434 libc_cv_Bgroup=yes
1435 else
1436 libc_cv_Bgroup=no
1437 fi
1438 rm -f conftest*])
1439 AC_SUBST(libc_cv_Bgroup)
1441 ASFLAGS_config=
1442 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1443 libc_cv_as_noexecstack, [dnl
1444 cat > conftest.c <<EOF
1445 void foo (void) { }
1446 EOF
1447 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1448 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1449 && grep .note.GNU-stack conftest.s >/dev/null \
1450 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1451 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1452 then
1453 libc_cv_as_noexecstack=yes
1454 else
1455 libc_cv_as_noexecstack=no
1456 fi
1457 rm -f conftest*])
1458 if test $libc_cv_as_noexecstack = yes; then
1459 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1460 fi
1461 AC_SUBST(ASFLAGS_config)
1463 AC_CACHE_CHECK(for -z combreloc,
1464 libc_cv_z_combreloc, [dnl
1465 cat > conftest.c <<EOF
1466 extern int bar (int);
1467 extern int mumble;
1468 int foo (void) { return bar (mumble); }
1469 EOF
1470 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1471 -fPIC -shared -o conftest.so conftest.c
1472 -nostdlib -nostartfiles
1473 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1474 then
1475 dnl The following test is a bit weak. We must use a tool which can test
1476 dnl cross-platform since the gcc used can be a cross compiler. Without
1477 dnl introducing new options this is not easily doable. Instead use a tool
1478 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1479 dnl look for a section named .rel.dyn.
1480 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1481 libc_cv_z_combreloc=yes
1482 else
1483 libc_cv_z_combreloc=no
1484 fi
1485 else
1486 libc_cv_z_combreloc=no
1487 fi
1488 rm -f conftest*])
1489 if test "$libc_cv_z_combreloc" = yes; then
1490 AC_DEFINE(HAVE_Z_COMBRELOC)
1491 fi
1492 AC_SUBST(libc_cv_z_combreloc)
1494 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1495 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1496 AC_SUBST(libc_cv_z_execstack)
1498 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1499 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1500 ])
1502 AC_SUBST(libc_cv_fpie)
1504 AC_CACHE_CHECK(for --hash-style option,
1505 libc_cv_hashstyle, [dnl
1506 cat > conftest.c <<EOF
1507 int _start (void) { return 42; }
1508 EOF
1509 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1510 -fPIC -shared -o conftest.so conftest.c
1511 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1512 then
1513 libc_cv_hashstyle=yes
1514 else
1515 libc_cv_hashstyle=no
1516 fi
1517 rm -f conftest*])
1518 AC_SUBST(libc_cv_hashstyle)
1520 # The linker's default -shared behavior is good enough if it
1521 # does these things that our custom linker scripts ensure that
1522 # all allocated NOTE sections come first.
1523 if test "$use_default_link" = default; then
1524 AC_CACHE_CHECK([for sufficient default -shared layout],
1525 libc_cv_use_default_link, [dnl
1526 libc_cv_use_default_link=no
1527 cat > conftest.s <<\EOF
1528 .section .note.a,"a",%note
1529 .balign 4
1530 .long 4,4,9
1531 .string "GNU"
1532 .string "foo"
1533 .section .note.b,"a",%note
1534 .balign 4
1535 .long 4,4,9
1536 .string "GNU"
1537 .string "bar"
1538 EOF
1539 if AC_TRY_COMMAND([dnl
1540 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1541 ac_try=`$READELF -S conftest.so | sed -n \
1542 ['${x;p;}
1543 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1544 t a
1545 b
1546 : a
1547 H']`
1548 then
1549 libc_seen_a=no libc_seen_b=no
1550 set -- $ac_try
1551 while test $# -ge 2 -a "$1" = NOTE; do
1552 case "$2" in
1553 .note.a) libc_seen_a=yes ;;
1554 .note.b) libc_seen_b=yes ;;
1555 esac
1556 shift 2
1557 done
1558 case "$libc_seen_a$libc_seen_b" in
1559 yesyes)
1560 libc_cv_use_default_link=yes
1561 ;;
1562 *)
1563 echo >&AS_MESSAGE_LOG_FD "\
1564 $libc_seen_a$libc_seen_b from:
1565 $ac_try"
1566 ;;
1567 esac
1568 fi
1569 rm -f conftest*])
1570 use_default_link=$libc_cv_use_default_link
1571 fi
1573 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1574 if libc_cv_output_format=`
1575 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1576 then
1577 :
1578 else
1579 libc_cv_output_format=
1580 fi
1581 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1582 AC_SUBST(libc_cv_output_format)
1584 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1585 cat > conftest.c <<EOF
1586 int foo;
1587 EOF
1588 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1589 conftest.c 1>&AS_MESSAGE_LOG_FD])
1590 then
1591 libc_cv_fno_toplevel_reorder=yes
1592 else
1593 libc_cv_fno_toplevel_reorder=no
1594 fi
1595 rm -f conftest*])
1596 if test $libc_cv_fno_toplevel_reorder = yes; then
1597 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1598 else
1599 fno_unit_at_a_time=-fno-unit-at-a-time
1600 fi
1601 AC_SUBST(fno_unit_at_a_time)
1603 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1604 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1605 [libc_cv_ssp=yes],
1606 [libc_cv_ssp=no])
1607 ])
1608 AC_SUBST(libc_cv_ssp)
1610 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1611 cat > conftest.c <<EOF
1612 int foo;
1613 #ifdef __GNUC_GNU_INLINE__
1614 main () { return 0;}
1615 #else
1616 #error
1617 #endif
1618 EOF
1619 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1620 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1621 then
1622 libc_cv_gnu89_inline=yes
1623 else
1624 libc_cv_gnu89_inline=no
1625 fi
1626 rm -f conftest*])
1627 if test $libc_cv_gnu89_inline = yes; then
1628 gnu89_inline=-fgnu89-inline
1629 else
1630 gnu89_inline=
1631 fi
1632 AC_SUBST(gnu89_inline)
1634 AC_CACHE_CHECK(whether cc puts quotes around section names,
1635 libc_cv_have_section_quotes,
1636 [cat > conftest.c <<EOF
1637 static const int foo
1638 __attribute__ ((section ("bar"))) = 1;
1639 EOF
1640 if ${CC-cc} -S conftest.c -o conftest.s; then
1641 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1642 libc_cv_have_section_quotes=yes
1643 else
1644 libc_cv_have_section_quotes=no
1645 fi
1646 else
1647 libc_cv_have_section_quotes=unknown
1648 fi
1649 rm -f conftest.{c,s}
1650 ])
1651 if test $libc_cv_have_section_quotes = yes; then
1652 AC_DEFINE(HAVE_SECTION_QUOTES)
1653 fi
1655 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1656 [dnl
1657 cat > conftest.s <<EOF
1658 ${libc_cv_dot_text}
1659 .globl foo
1660 foo:
1661 .weak foo
1662 .weak bar; bar = foo
1663 EOF
1664 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1665 libc_cv_asm_weak_directive=yes
1666 else
1667 libc_cv_asm_weak_directive=no
1668 fi
1669 rm -f conftest*])
1671 if test $libc_cv_asm_weak_directive = no; then
1672 AC_CACHE_CHECK(for assembler .weakext directive,
1673 libc_cv_asm_weakext_directive,
1674 [dnl
1675 cat > conftest.s <<EOF
1676 ${libc_cv_dot_text}
1677 .globl foo
1678 foo:
1679 .weakext bar foo
1680 .weakext baz
1681 .globl baz
1682 baz:
1683 EOF
1684 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1685 libc_cv_asm_weakext_directive=yes
1686 else
1687 libc_cv_asm_weakext_directive=no
1688 fi
1689 rm -f conftest*])
1691 fi # no .weak
1693 if test $libc_cv_asm_weak_directive = yes; then
1694 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1695 elif test $libc_cv_asm_weakext_directive = yes; then
1696 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1697 fi
1699 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1700 case $machine in
1701 sparc/sparc64*) cfi_offset=2047;;
1702 *) cfi_offset=0;;
1703 esac
1704 cat > conftest.s <<EOF
1705 .text
1706 .type func,%function
1707 func:
1708 .cfi_startproc
1709 .cfi_remember_state
1710 .cfi_rel_offset 1, $cfi_offset
1711 .cfi_endproc
1712 EOF
1713 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1714 libc_cv_asm_cfi_directives=yes
1715 else
1716 libc_cv_asm_cfi_directives=no
1717 fi
1718 rm -f conftest*])
1719 if test $libc_cv_asm_cfi_directives = yes; then
1720 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1721 fi
1723 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1724 cat > conftest.c <<\EOF
1725 _start () {}
1726 int __eh_pc;
1727 __throw () {}
1728 EOF
1729 dnl No \ in command here because it ends up inside ''.
1730 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1731 -nostdlib -nostartfiles -Wl,--no-whole-archive
1732 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1733 libc_cv_ld_no_whole_archive=yes
1734 else
1735 libc_cv_ld_no_whole_archive=no
1736 fi
1737 rm -f conftest*])
1738 if test $libc_cv_ld_no_whole_archive = no; then
1739 AC_MSG_ERROR([support for --no-whole-archive is needed])
1740 fi
1742 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1743 cat > conftest.c <<\EOF
1744 _start () {}
1745 int __eh_pc;
1746 __throw () {}
1747 EOF
1748 dnl No \ in command here because it ends up inside ''.
1749 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1750 -nostdlib -nostartfiles -fexceptions
1751 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1752 libc_cv_gcc_exceptions=yes
1753 else
1754 libc_cv_gcc_exceptions=no
1755 fi
1756 rm -f conftest*])
1757 if test $libc_cv_gcc_exceptions = yes; then
1758 exceptions=-fexceptions
1759 fi
1760 AC_SUBST(exceptions)dnl
1762 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1763 cat > conftest.c <<\EOF
1764 void zero (void *x)
1765 {
1766 __builtin_memset (x, 0, 1000);
1767 }
1768 EOF
1769 dnl
1770 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1771 then
1772 libc_cv_gcc_builtin_memset=no
1773 else
1774 libc_cv_gcc_builtin_memset=yes
1775 fi
1776 rm -f conftest* ])
1777 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1778 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1779 fi
1781 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1782 cat > conftest.c <<\EOF
1783 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1784 char *foo (const char *a, const char *b)
1785 {
1786 return __builtin_strstr (a, b);
1787 }
1788 EOF
1789 dnl
1790 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1791 then
1792 libc_cv_gcc_builtin_redirection=yes
1793 else
1794 libc_cv_gcc_builtin_redirection=no
1795 fi
1796 rm -f conftest* ])
1797 if test "$libc_cv_gcc_builtin_redirection" = no; then
1798 AC_MSG_ERROR([support for the symbol redirection needed])
1799 fi
1801 dnl Check whether the compiler supports the __thread keyword.
1802 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1803 [cat > conftest.c <<\EOF
1804 __thread int a = 42;
1805 EOF
1806 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1807 libc_cv_gcc___thread=yes
1808 else
1809 libc_cv_gcc___thread=no
1810 fi
1811 rm -f conftest*])
1812 if test "$libc_cv_gcc___thread" = no; then
1813 AC_MSG_ERROR([support for the __thread keyword is required])
1814 fi
1816 dnl Check whether the compiler supports the tls_model attribute.
1817 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1818 cat > conftest.c <<\EOF
1819 extern __thread int a __attribute__((tls_model ("initial-exec")));
1820 EOF
1821 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1822 libc_cv_gcc_tls_model_attr=yes
1823 else
1824 libc_cv_gcc_tls_model_attr=no
1825 fi
1826 rm -f conftest*])
1827 if test "$libc_cv_gcc_tls_model_attr" = no; then
1828 AC_MSG_ERROR([support for the tls_model attribute is required])
1829 fi
1831 dnl Determine how to disable generation of FMA instructions.
1832 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1833 libc_cv_cc_nofma, [dnl
1834 libc_cv_cc_nofma=
1835 for opt in -ffp-contract=off -mno-fused-madd; do
1836 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1837 done])
1838 AC_SUBST(libc_cv_cc_nofma)
1840 if test -n "$submachine"; then
1841 AC_CACHE_CHECK([for compiler option for CPU variant],
1842 libc_cv_cc_submachine, [dnl
1843 libc_cv_cc_submachine=no
1844 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1845 LIBC_TRY_CC_OPTION([$opt], [
1846 libc_cv_cc_submachine="$opt"
1847 break], [])
1848 done])
1849 if test "x$libc_cv_cc_submachine" = xno; then
1850 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1851 fi
1852 fi
1853 AC_SUBST(libc_cv_cc_submachine)
1855 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1856 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1857 cat > conftest.c <<EOF
1858 void
1859 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1860 foo (void) {}
1861 EOF
1862 libc_cv_cc_loop_to_function=no
1863 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1864 then
1865 libc_cv_cc_loop_to_function=yes
1866 fi
1867 rm -f conftest*])
1868 if test $libc_cv_cc_loop_to_function = yes; then
1869 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1870 fi
1871 AC_SUBST(libc_cv_cc_loop_to_function)
1873 dnl Check whether we have the gd library available.
1874 AC_MSG_CHECKING(for libgd)
1875 if test "$with_gd" != "no"; then
1876 old_CFLAGS="$CFLAGS"
1877 CFLAGS="$CFLAGS $libgd_include"
1878 old_LDFLAGS="$LDFLAGS"
1879 LDFLAGS="$LDFLAGS $libgd_ldflags"
1880 old_LIBS="$LIBS"
1881 LIBS="$LIBS -lgd -lpng -lz -lm"
1882 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1883 CFLAGS="$old_CFLAGS"
1884 LDFLAGS="$old_LDFLAGS"
1885 LIBS="$old_LIBS"
1886 else
1887 LIBGD=no
1888 fi
1889 AC_MSG_RESULT($LIBGD)
1890 AC_SUBST(LIBGD)
1892 # SELinux detection
1893 if test x$with_selinux = xno ; then
1894 have_selinux=no;
1895 else
1896 # See if we have the SELinux library
1897 AC_CHECK_LIB(selinux, is_selinux_enabled,
1898 have_selinux=yes, have_selinux=no)
1899 if test x$with_selinux = xyes ; then
1900 if test x$have_selinux = xno ; then
1901 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1902 fi
1903 fi
1904 fi
1905 # Check if we're building with SELinux support.
1906 if test "x$have_selinux" = xyes; then
1907 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1909 # See if we have the libaudit library
1910 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1911 have_libaudit=yes, have_libaudit=no)
1912 if test "x$have_libaudit" = xyes; then
1913 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1914 fi
1915 AC_SUBST(have_libaudit)
1917 # See if we have the libcap library
1918 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1919 if test "x$have_libcap" = xyes; then
1920 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1921 fi
1922 AC_SUBST(have_libcap)
1923 fi
1924 AC_SUBST(have_selinux)
1926 dnl check for the size of 'long double'.
1927 AC_CHECK_SIZEOF(long double, 0)
1928 sizeof_long_double=$ac_cv_sizeof_long_double
1929 AC_SUBST(sizeof_long_double)
1931 CPPUNDEFS=
1932 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1933 dnl Since we are building the implementations of the fortified functions here,
1934 dnl having the macro defined interacts very badly.
1935 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1936 [AC_TRY_COMPILE([], [
1937 #ifdef _FORTIFY_SOURCE
1938 # error bogon
1939 #endif],
1940 [libc_cv_predef_fortify_source=no],
1941 [libc_cv_predef_fortify_source=yes])])
1942 if test $libc_cv_predef_fortify_source = yes; then
1943 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1944 fi
1945 AC_SUBST(CPPUNDEFS)
1947 dnl Check for silly hacked compilers inserting -fstack-protector.
1948 dnl This breaks badly for the early startup code we compile, since
1949 dnl the compiled code can refer to a magic machine-dependent location
1950 dnl for the canary value before we have sufficient setup for that to
1951 dnl work. It's also questionable to build all of libc with this flag
1952 dnl even when you're doing that for most applications you build, since
1953 dnl libc's code is so heavily-used and performance-sensitive. If we
1954 dnl ever really want to make that work, it should be enabled explicitly
1955 dnl in the libc build, not inherited from implicit compiler settings.
1956 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1957 libc_cv_predef_stack_protector, [
1958 AC_TRY_COMPILE([extern void foobar (char *);],
1959 [char large_array[2048]; foobar (large_array);], [
1960 libc_undefs=`$NM -u conftest.o |
1961 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1962 2>&AS_MESSAGE_LOG_FD` || {
1963 AC_MSG_ERROR([confusing output from $NM -u])
1964 }
1965 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1966 # On some architectures, there are architecture-specific undefined
1967 # symbols (resolved by the linker), so filter out unknown symbols.
1968 # This will fail to produce the correct result if the compiler
1969 # defaults to -fstack-protector but this produces an undefined symbol
1970 # other than __stack_chk_fail. However, compilers like that have not
1971 # been encountered in practice.
1972 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1973 case "$libc_undefs" in
1974 foobar) libc_cv_predef_stack_protector=no ;;
1975 '__stack_chk_fail
1976 foobar') libc_cv_predef_stack_protector=yes ;;
1977 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1978 esac],
1979 [AC_MSG_ERROR([test compilation failed])])
1980 ])
1981 libc_extra_cflags=
1982 if test $libc_cv_predef_stack_protector = yes; then
1983 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1984 fi
1985 libc_extra_cppflags=
1987 AC_CACHE_CHECK([whether the linker provides __ehdr_start],
1988 libc_cv_ehdr_start, [
1989 old_CFLAGS="$CFLAGS"
1990 old_LDFLAGS="$LDFLAGS"
1991 old_LIBS="$LIBS"
1992 CFLAGS="$CFLAGS -fPIC"
1993 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1994 LIBS=
1995 AC_LINK_IFELSE([AC_LANG_SOURCE([
1996 extern const char __ehdr_start __attribute__ ((visibility ("hidden")));
1997 const char *ehdr (void) { return &__ehdr_start; }
1998 ])],
1999 [libc_cv_ehdr_start=yes], [libc_cv_ehdr_start=no])
2000 CFLAGS="$old_CFLAGS"
2001 LDFLAGS="$old_LDFLAGS"
2002 LIBS="$old_LIBS"
2003 ])
2004 if test $libc_cv_ehdr_start = yes; then
2005 AC_DEFINE([HAVE_EHDR_START])
2006 fi
2008 ### End of automated tests.
2009 ### Now run sysdeps configure fragments.
2011 # They also can set these variables.
2012 use_ldconfig=no
2013 ldd_rewrite_script=no
2014 libc_cv_sysconfdir=$sysconfdir
2015 libc_cv_localstatedir=$localstatedir
2016 libc_cv_gcc_unwind_find_fde=no
2017 libc_cv_idn=no
2019 # Iterate over all the sysdep directories we will use, running their
2020 # configure fragments.
2021 for dir in $sysnames; do
2022 case $dir in
2023 /*) dest=$dir ;;
2024 *) dest=$srcdir/$dir ;;
2025 esac
2026 if test -r $dest/configure; then
2027 AC_MSG_RESULT(running configure fragment for $dir)
2028 . $dest/configure
2029 fi
2030 done
2032 AC_SUBST(libc_extra_cflags)
2033 AC_SUBST(libc_extra_cppflags)
2035 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2036 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2037 fi
2038 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2040 # A sysdeps configure fragment can reset this if IFUNC is not actually
2041 # usable even though the assembler knows how to generate the symbol type.
2042 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2043 AC_DEFINE(HAVE_IFUNC)
2044 fi
2046 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2047 # configure fragment can override the value to prevent this AC_DEFINE.
2048 AC_SUBST(use_nscd)
2049 if test "x$use_nscd" != xno; then
2050 AC_DEFINE([USE_NSCD])
2051 fi
2052 if test "x$build_nscd" = xdefault; then
2053 build_nscd=$use_nscd
2054 fi
2056 # Test for old glibc 2.0.x headers so that they can be removed properly
2057 # Search only in includedir.
2058 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2059 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2060 then
2061 old_glibc_headers=yes
2062 else
2063 old_glibc_headers=no
2064 fi
2065 AC_MSG_RESULT($old_glibc_headers)
2066 if test ${old_glibc_headers} = yes; then
2067 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2068 AC_MSG_WARN(*** be removed.)
2069 fi
2070 AC_SUBST(old_glibc_headers)
2072 AC_SUBST(libc_cv_slibdir)
2073 AC_SUBST(libc_cv_rtlddir)
2074 AC_SUBST(libc_cv_localedir)
2075 AC_SUBST(libc_cv_sysconfdir)
2076 AC_SUBST(libc_cv_localstatedir)
2077 AC_SUBST(libc_cv_rootsbindir)
2078 AC_SUBST(libc_cv_forced_unwind)
2080 if test x$use_ldconfig = xyes; then
2081 AC_DEFINE(USE_LDCONFIG)
2082 fi
2083 AC_SUBST(use_ldconfig)
2084 AC_SUBST(ldd_rewrite_script)
2086 AC_SUBST(static)
2087 AC_SUBST(shared)
2089 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2090 [libc_cv_pic_default=yes
2091 cat > conftest.c <<EOF
2092 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2093 # error PIC is default.
2094 #endif
2095 EOF
2096 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2097 libc_cv_pic_default=no
2098 fi
2099 rm -f conftest.*])
2100 AC_SUBST(libc_cv_pic_default)
2102 AC_SUBST(profile)
2103 AC_SUBST(static_nss)
2105 AC_SUBST(DEFINES)
2107 dnl See sysdeps/mach/configure.ac for this variable.
2108 AC_SUBST(mach_interface_list)
2110 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2111 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2112 AC_SUBST(VERSION)
2113 AC_SUBST(RELEASE)
2115 AC_CONFIG_FILES([config.make Makefile])
2116 AC_CONFIG_COMMANDS([default],[[
2117 case $CONFIG_FILES in *config.make*)
2118 echo "$config_vars" >> config.make;;
2119 esac
2120 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2121 AC_OUTPUT