| blob | 6fac0855e3c99780c6a409a6e3f2c25bae200df0 |
1 dnl Process this file with autoconf to produce a configure script.
2 AC_PREREQ(2.53)dnl dnl Minimum Autoconf version required.
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 # Glibc should not depend on any header files
9 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
10 [m4_divert_text([DEFAULTS],
11 [ac_includes_default='/* none */'])])
13 dnl This is here so we can set $subdirs directly based on configure fragments.
14 AC_CONFIG_SUBDIRS()
16 AC_CANONICAL_HOST
18 AC_PROG_CC
19 if test $host != $build; then
20 AC_CHECK_PROGS(BUILD_CC, gcc cc)
21 fi
22 AC_SUBST(cross_compiling)
23 AC_PROG_CPP
24 # We need the C++ compiler only for testing.
25 AC_PROG_CXX
27 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
28 AC_MSG_ERROR([you must configure in a separate build directory])
29 fi
31 # This will get text that should go into config.make.
32 config_vars=
34 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
35 AC_ARG_WITH([gd],
36 AC_HELP_STRING([--with-gd=DIR],
37 [find libgd include dir and library with prefix DIR]),
38 [dnl
39 case "$with_gd" in
40 yes|''|no) ;;
41 *) libgd_include="-I$withval/include"
42 libgd_ldflags="-L$withval/lib" ;;
43 esac
44 ])
45 AC_ARG_WITH([gd-include],
46 AC_HELP_STRING([--with-gd-include=DIR],
47 [find libgd include files in DIR]),
48 [dnl
49 case "$with_gd_include" in
50 ''|no) ;;
51 *) libgd_include="-I$withval" ;;
52 esac
53 ])
54 AC_ARG_WITH([gd-lib],
55 AC_HELP_STRING([--with-gd-lib=DIR],
56 [find libgd library files in DIR]),
57 [dnl
58 case "$with_gd_lib" in
59 ''|no) ;;
60 *) libgd_ldflags="-L$withval" ;;
61 esac
62 ])
64 if test -n "$libgd_include"; then
65 config_vars="$config_vars
66 CFLAGS-memusagestat.c = $libgd_include"
67 fi
68 if test -n "$libgd_ldflags"; then
69 config_vars="$config_vars
70 libgd-LDFLAGS = $libgd_ldflags"
71 fi
73 dnl Arguments to specify presence of other packages/features.
74 AC_ARG_WITH([fp],
75 AC_HELP_STRING([--with-fp],
76 [if using floating-point hardware @<:@default=yes@:>@]),
77 [with_fp=$withval],
78 [with_fp=yes])
79 AC_SUBST(with_fp)
80 AC_ARG_WITH([binutils],
81 AC_HELP_STRING([--with-binutils=PATH],
82 [specify location of binutils (as and ld)]),
83 [path_binutils=$withval],
84 [path_binutils=''])
85 AC_ARG_WITH([selinux],
86 AC_HELP_STRING([--with-selinux],
87 [if building with SELinux support]),
88 [with_selinux=$withval],
89 [with_selinux=auto])
91 AC_ARG_WITH([headers],
92 AC_HELP_STRING([--with-headers=PATH],
93 [location of system headers to use
94 (for example /usr/src/linux/include)
95 @<:@default=compiler default@:>@]),
96 [sysheaders=$withval],
97 [sysheaders=''])
99 AC_SUBST(use_default_link)
100 AC_ARG_WITH([default-link],
101 AC_HELP_STRING([--with-default-link],
102 [do not use explicit linker scripts]),
103 [use_default_link=$withval],
104 [use_default_link=default])
106 AC_ARG_ENABLE([sanity-checks],
107 AC_HELP_STRING([--disable-sanity-checks],
108 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
109 [enable_sanity=$enableval],
110 [enable_sanity=yes])
112 AC_ARG_ENABLE([shared],
113 AC_HELP_STRING([--enable-shared],
114 [build shared library @<:@default=yes if GNU ld@:>@]),
115 [shared=$enableval],
116 [shared=yes])
117 AC_ARG_ENABLE([profile],
118 AC_HELP_STRING([--enable-profile],
119 [build profiled library @<:@default=no@:>@]),
120 [profile=$enableval],
121 [profile=no])
122 AC_ARG_ENABLE([versioning],
123 AC_HELP_STRING([--disable-versioning],
124 [do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
125 [enable_versioning=$enableval],
126 [enable_versioning=yes])
128 AC_ARG_ENABLE([oldest-abi],
129 AC_HELP_STRING([--enable-oldest-abi=ABI],
130 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
131 [oldest_abi=$enableval],
132 [oldest_abi=no])
133 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
134 oldest_abi=default
135 else
136 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
137 fi
138 AC_SUBST(oldest_abi)
140 AC_ARG_ENABLE([stackguard-randomization],
141 AC_HELP_STRING([--enable-stackguard-randomization],
142 [initialize __stack_chk_guard canary with a random number at program start]),
143 [enable_stackguard_randomize=$enableval],
144 [enable_stackguard_randomize=no])
145 if test "$enable_stackguard_randomize" = yes; then
146 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
147 fi
149 dnl Generic infrastructure for drop-in additions to libc.
150 AC_ARG_ENABLE([add-ons],
151 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
152 [configure and build add-ons in DIR1,DIR2,...
153 search for add-ons if no parameter given]),
154 , [enable_add_ons=yes])
156 AC_ARG_ENABLE([hidden-plt],
157 AC_HELP_STRING([--disable-hidden-plt],
158 [do not hide internal function calls to avoid PLT]),
159 [hidden=$enableval],
160 [hidden=yes])
161 if test "x$hidden" = xno; then
162 AC_DEFINE(NO_HIDDEN)
163 fi
165 AC_ARG_ENABLE([bind-now],
166 AC_HELP_STRING([--enable-bind-now],
167 [disable lazy relocations in DSOs]),
168 [bindnow=$enableval],
169 [bindnow=no])
170 AC_SUBST(bindnow)
172 dnl On some platforms we cannot use dynamic loading. We must provide
173 dnl static NSS modules.
174 AC_ARG_ENABLE([static-nss],
175 AC_HELP_STRING([--enable-static-nss],
176 [build static NSS modules @<:@default=no@:>@]),
177 [static_nss=$enableval],
178 [static_nss=no])
179 dnl Enable static NSS also if we build no shared objects.
180 if test x"$static_nss" = xyes || test x"$shared" = xno; then
181 static_nss=yes
182 AC_DEFINE(DO_STATIC_NSS)
183 fi
185 AC_ARG_ENABLE([force-install],
186 AC_HELP_STRING([--disable-force-install],
187 [don't force installation of files from this package, even if they are older than the installed files]),
188 [force_install=$enableval],
189 [force_install=yes])
190 AC_SUBST(force_install)
192 dnl On some platforms we allow dropping compatibility with all kernel
193 dnl versions.
194 AC_ARG_ENABLE([kernel],
195 AC_HELP_STRING([--enable-kernel=VERSION],
196 [compile for compatibility with kernel not older than VERSION]),
197 [minimum_kernel=$enableval],
198 [])
199 dnl Prevent unreasonable values.
200 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
201 # Better nothing than this.
202 minimum_kernel=""
203 else
204 if test "$minimum_kernel" = current; then
205 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
206 fi
207 fi
209 dnl For the development we sometimes want gcc to issue even more warnings.
210 dnl This is not the default since many of the extra warnings are not
211 dnl appropriate.
212 AC_ARG_ENABLE([all-warnings],
213 AC_HELP_STRING([--enable-all-warnings],
214 [enable all useful warnings gcc can issue]),
215 [all_warnings=$enableval],
216 [])
217 AC_SUBST(all_warnings)
219 AC_ARG_ENABLE([multi-arch],
220 AC_HELP_STRING([--enable-multi-arch],
221 [enable single DSO with optimizations for multiple architectures]),
222 [multi_arch=$enableval],
223 [multi_arch=default])
225 AC_ARG_ENABLE([nss-crypt],
226 AC_HELP_STRING([--enable-nss-crypt],
227 [enable libcrypt to use nss]),
228 [nss_crypt=$enableval],
229 [nss_crypt=no])
230 if test x$nss_crypt = xyes; then
231 nss_includes=-I$(nss-config --includedir 2>/dev/null)
232 if test $? -ne 0; then
233 AC_MSG_ERROR([cannot find include directory with nss-config])
234 fi
235 old_CFLAGS="$CFLAGS"
236 CFLAGS="$CFLAGS $nss_includes"
237 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
238 #include <hasht.h>
239 #include <nsslowhash.h>
240 void f (void) { NSSLOW_Init (); }])],
241 libc_cv_nss_crypt=yes,
242 AC_MSG_ERROR([
243 cannot find NSS headers with lowlevel hash function interfaces]))
244 old_LIBS="$LIBS"
245 LIBS="$LIBS -lfreebl3"
246 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
247 #include <hasht.h>
248 #include <nsslowhash.h>],
249 [NSSLOW_Init();])],
250 libc_cv_nss_crypt=yes,
251 AC_MSG_ERROR([
252 cannot link program using lowlevel NSS hash functions]))
253 CFLAGS="$old_CFLAGS"
254 LIBS="$old_LIBS"
255 else
256 libc_cv_nss_crypt=no
257 fi
258 AC_SUBST(libc_cv_nss_crypt)
261 AC_ARG_ENABLE([obsolete-rpc],
262 AC_HELP_STRING([--enable-obsolete-rpc],
263 [build and install the obsolete RPC code for link-time usage]),
264 [link_obsolete_rpc=$enableval],
265 [link_obsolete_rpc=no])
266 AC_SUBST(link_obsolete_rpc)
268 if test "$link_obsolete_rpc" = yes; then
269 AC_DEFINE(LINK_OBSOLETE_RPC)
270 fi
272 AC_ARG_ENABLE([systemtap],
273 [AS_HELP_STRING([--enable-systemtap],
274 [enable systemtap static probe points @<:@default=no@:>@])],
275 [systemtap=$enableval],
276 [systemtap=no])
277 if test "x$systemtap" != xno; then
278 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
279 old_CFLAGS="$CFLAGS"
280 CFLAGS="-std=gnu99 $CFLAGS"
281 AC_COMPILE_IFELSE([#include <sys/sdt.h>
282 void foo (int i, void *p)
283 {
284 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
285 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
286 }], [libc_cv_sdt=yes], [libc_cv_sdt=no])
287 CFLAGS="$old_CFLAGS"])
288 if test $libc_cv_sdt = yes; then
289 AC_DEFINE([USE_STAP_PROBE])
290 elif test "x$systemtap" != xauto; then
291 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
292 fi
293 fi
295 # The way shlib-versions is used to generate soversions.mk uses a
296 # fairly simplistic model for name recognition that can't distinguish
297 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
298 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
299 # tell. This doesn't get used much beyond that, so it's fairly safe.
300 case "$host_os" in
301 linux*)
302 ;;
303 gnu*)
304 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
305 ;;
306 esac
308 # We keep the original values in `$config_*' and never modify them, so we
309 # can write them unchanged into config.make. Everything else uses
310 # $machine, $vendor, and $os, and changes them whenever convenient.
311 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
313 # Don't allow vendor == "unknown"
314 test "$config_vendor" = unknown && config_vendor=
315 config_os="`echo $config_os | sed 's/^unknown-//'`"
317 # Some configurations imply other options.
318 elf=yes
320 # The configure fragment of an add-on port can modify these to supplement
321 # or override the table in the case statement below. No fragment should
322 # ever change the config_* variables, however.
323 machine=$config_machine
324 vendor=$config_vendor
325 os=$config_os
326 base_os=''
328 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
329 # Unify this here.
330 if test "$machine" = rs6000; then
331 machine="powerpc"
332 fi
334 # Braindead PowerPC box with absolutely no FPU.
335 case "$machine-$host_os" in
336 powerpc*-*soft)
337 with_fp=no
338 ;;
339 esac
341 submachine=
342 AC_ARG_WITH([cpu],
343 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
344 [dnl
345 case "$withval" in
346 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
347 no) ;;
348 *) submachine="$withval" ;;
349 esac
350 ])
352 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
353 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
355 # An add-on can set this when it wants to disable the sanity check below.
356 libc_config_ok=no
358 dnl Having this here, though empty, makes sure that if add-ons' fragments
359 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
360 dnl our AC_OUTPUT will actually use it.
361 AC_CONFIG_SUBDIRS()
363 case "$enable_add_ons" in
364 ''|no) add_ons= ;;
365 yes|'*')
366 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
367 sed 's@/[[^/]]*$@@' | sort | uniq`
368 add_ons_automatic=yes
369 ;;
370 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
371 add_ons_automatic=no ;;
372 esac
374 configured_add_ons=
375 add_ons_sfx=
376 add_ons_pfx=
377 if test x"$add_ons" != x; then
378 for f in $add_ons; do
379 # Some sanity checks
380 case "$f" in
381 crypt)
382 AC_MSG_ERROR([
383 *** It seems that you're using an old \`crypt' add-on. crypt is now
384 *** part of glibc and using the old add-on will not work with this
385 *** release. Start again with fresh sources and without the old
386 *** \`crypt' add-on.])
387 ;;
388 localedata)
389 AC_MSG_ERROR([
390 *** It seems that you're using an old \`localedata' add-on. localedata
391 *** is now part of glibc and using the old add-on will not work with
392 *** this release. Start again with fresh sources and without the old
393 *** \`localedata' add-on.])
394 ;;
395 esac
396 done
398 # Now source each add-on's configure fragment.
399 # The fragments can use $srcdir/$libc_add_on to find themselves,
400 # and test $add_ons_automatic to see if they were explicitly requested.
401 # A fragment can clear (or even change) $libc_add_on to affect
402 # whether it goes into the list to be actually used in the build.
403 use_add_ons=
404 for libc_add_on in $add_ons; do
405 # Test whether such a directory really exists.
406 # It can be absolute, or relative to $srcdir, or relative to the build dir.
407 case "$libc_add_on" in
408 /*)
409 libc_add_on_srcdir=$libc_add_on
410 ;;
411 *)
412 test -d "$srcdir/$libc_add_on" || {
413 if test -d "$libc_add_on"; then
414 libc_add_on="`pwd`/$libc_add_on"
415 else
416 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
417 fi
418 }
419 libc_add_on_srcdir=$srcdir/$libc_add_on
420 ;;
421 esac
423 libc_add_on_frag=$libc_add_on_srcdir/configure
424 libc_add_on_canonical=
425 libc_add_on_config_subdirs=
426 if test -r "$libc_add_on_frag"; then
427 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
428 libc_add_on_canonical=unknown
429 libc_add_on_subdirs=
430 . "$libc_add_on_frag"
431 test -z "$libc_add_on" || {
432 configured_add_ons="$configured_add_ons $libc_add_on"
433 if test "x$libc_add_on_canonical" = xunknown; then
434 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
435 fi
436 for d in $libc_add_on_subdirs; do
437 case "$libc_add_on" in
438 /*) subdir_srcdir="$libc_add_on" ;;
439 *) subdir_srcdir="\$(..)$libc_add_on" ;;
440 esac
441 case "$d" in
442 .)
443 d="${libc_add_on_canonical:-$libc_add_on}"
444 ;;
445 /*)
446 subdir_srcdir="$d"
447 ;;
448 *)
449 subdir_srcdir="$subdir_srcdir/$d"
450 ;;
451 esac
452 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
453 add_on_subdirs="$add_on_subdirs $d"
454 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
455 $d-srcdir = $subdir_srcdir"
456 done
457 for d in $libc_add_on_config_subdirs; do
458 case "$d" in
459 /*) AC_MSG_ERROR(dnl
460 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
461 esac
462 if test ! -d "$libc_add_on_srcdir/$d"; then
463 AC_MSG_ERROR(fragment wants to configure missing directory $d)
464 fi
465 case "$libc_add_on" in
466 /*) AC_MSG_ERROR(dnl
467 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
468 esac
469 subdirs="$subdirs $libc_add_on/$d"
470 done
471 }
472 fi
473 if test -n "$libc_add_on"; then
474 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
475 use_add_ons="$use_add_ons $libc_add_on"
476 add_ons_pfx="$add_ons_pfx $libc_add_on/"
477 test -z "$libc_add_on_canonical" ||
478 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
479 fi
480 done
481 # Use echo to strip excess whitespace.
482 add_ons="`echo $use_add_ons`"
483 fi
484 AC_SUBST(add_ons)
485 AC_SUBST(add_on_subdirs)
488 ###
489 ### I put this here to prevent those annoying emails from people who cannot
490 ### read and try to compile glibc on unsupported platforms. --drepper
491 ###
492 ### By using the undocumented --enable-hacker-mode option for configure
493 ### one can skip this test to make the configuration not fail for unsupported
494 ### platforms.
495 ###
496 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
497 case "$machine-$host_os" in
498 *-linux* | *-gnu*)
499 ;;
500 *)
501 echo "*** The GNU C library is currently not available for this platform."
502 echo "*** So far nobody cared to port it and if there is no volunteer it"
503 echo "*** might never happen. So, if you have interest to see glibc on"
504 echo "*** this platform visit"
505 echo "*** http://www.gnu.org/software/libc/porting.html"
506 echo "*** and join the group of porters"
507 exit 1
508 ;;
509 esac
510 fi
512 dnl We need to use [ and ] for other purposes for a while now.
513 changequote(,)dnl
514 # Expand the configuration machine name into a subdirectory by architecture
515 # type and particular chip. If an add-on configure fragment already set
516 # base_machine, we don't change it.
517 test -n "$base_machine" || case "$machine" in
518 i[34567]86) base_machine=i386 machine=i386/$machine ;;
519 powerpc) base_machine=powerpc machine=powerpc/powerpc32 ;;
520 powerpc64) base_machine=powerpc machine=powerpc/powerpc64 ;;
521 s390) base_machine=s390 machine=s390/s390-32 ;;
522 s390x) base_machine=s390 machine=s390/s390-64 ;;
523 sh3*) base_machine=sh machine=sh/sh3 ;;
524 sh4*) base_machine=sh machine=sh/sh4 ;;
525 sparc | sparcv[67])
526 base_machine=sparc machine=sparc/sparc32 ;;
527 sparcv8 | supersparc | hypersparc)
528 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
529 sparcv8plus | sparcv8plusa | sparcv9)
530 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
531 sparcv8plusb | sparcv9b)
532 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
533 sparcv9v)
534 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
535 sparcv9v2)
536 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
537 sparc64)
538 base_machine=sparc machine=sparc/sparc64 ;;
539 sparc64b)
540 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
541 sparc64v)
542 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
543 sparc64v2)
544 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
545 *) base_machine=$machine ;;
546 esac
547 changequote([,])dnl
548 AC_SUBST(base_machine)
550 if test "$base_machine" = "i386"; then
551 AC_DEFINE(USE_REGPARMS)
552 fi
554 # For the multi-arch option we need support in the assembler.
555 AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support],
556 libc_cv_asm_gnu_indirect_function, [dnl
557 cat > conftest.s <<EOF
558 .type foo,%gnu_indirect_function
559 EOF
560 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD;
561 then
562 libc_cv_asm_gnu_indirect_function=yes
563 else
564 libc_cv_asm_gnu_indirect_function=no
565 fi
566 rm -f conftest*])
568 AC_MSG_CHECKING(whether .text pseudo-op must be used)
569 AC_CACHE_VAL(libc_cv_dot_text, [dnl
570 cat > conftest.s <<EOF
571 .text
572 EOF
573 libc_cv_dot_text=
574 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
575 libc_cv_dot_text=.text
576 fi
577 rm -f conftest*])
578 if test -z "$libc_cv_dot_text"; then
579 AC_MSG_RESULT(no)
580 else
581 AC_MSG_RESULT(yes)
582 fi
584 AC_CACHE_CHECK(for assembler global-symbol directive,
585 libc_cv_asm_global_directive, [dnl
586 libc_cv_asm_global_directive=UNKNOWN
587 for ac_globl in .globl .global .EXPORT; do
588 cat > conftest.s <<EOF
589 ${libc_cv_dot_text}
590 ${ac_globl} foo
591 foo:
592 EOF
593 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
594 libc_cv_asm_global_directive=${ac_globl}
595 fi
596 rm -f conftest*
597 test $libc_cv_asm_global_directive != UNKNOWN && break
598 done])
599 if test $libc_cv_asm_global_directive = UNKNOWN; then
600 AC_MSG_ERROR(cannot determine asm global directive)
601 else
602 AC_DEFINE_UNQUOTED(ASM_GLOBAL_DIRECTIVE, ${libc_cv_asm_global_directive})
603 fi
605 AC_CACHE_CHECK(for assembler .type directive prefix,
606 libc_cv_asm_type_prefix, [dnl
607 libc_cv_asm_type_prefix=no
608 for ac_try_prefix in '@' '%' '#'; do
609 cat > conftest.s <<EOF
610 ${libc_cv_dot_text}
611 ${libc_cv_asm_global_directive} foo
612 .type foo, ${ac_try_prefix}object
613 .size foo, 1
614 foo:
615 .byte 1
616 EOF
617 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
618 libc_cv_asm_type_prefix=${ac_try_prefix}
619 fi
620 rm -f conftest*
621 test "x$libc_cv_asm_type_prefix" != xno && break
622 done])
623 if test "x$libc_cv_asm_type_prefix" != xno; then
624 AC_DEFINE_UNQUOTED(ASM_TYPE_DIRECTIVE_PREFIX, ${libc_cv_asm_type_prefix})
625 fi
627 if test x"$libc_cv_asm_gnu_indirect_function" != xyes -o x"$libc_cv_asm_type_prefix" = xno; then
628 if test x"$multi_arch" = xyes; then
629 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
630 else
631 multi_arch=no
632 fi
633 fi
634 if test x"$multi_arch" != xno; then
635 multi_arch_d=/multiarch
636 fi
638 # Compute the list of sysdep directories for this configuration.
639 # This can take a while to compute.
640 sysdep_dir=$srcdir/sysdeps
641 AC_MSG_CHECKING(sysdep dirs)
642 dnl We need to use [ and ] for other purposes for a while now.
643 changequote(,)dnl
644 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
645 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
647 test "x$base_os" != x || case "$os" in
648 gnu*)
649 base_os=mach/hurd ;;
650 linux*)
651 base_os=unix/sysv ;;
652 esac
654 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
655 tail=$os
656 ostry=$os
657 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
658 ostry="$ostry /$o"
659 tail=$o
660 done
661 o=`echo $tail | sed 's/[0-9]*$//'`
662 if test $o != $tail; then
663 ostry="$ostry /$o"
664 fi
665 # For linux-gnu, try linux-gnu, then linux.
666 o=`echo $tail | sed 's/-.*$//'`
667 if test $o != $tail; then
668 ostry="$ostry /$o"
669 fi
671 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
672 base=
673 tail=$base_os
674 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
675 set $b
676 base="$base /$1"
677 tail="$2"
678 done
680 # For sparc/sparc32, try sparc/sparc32 and then sparc.
681 mach=
682 tail=$machine${submachine:+/$submachine}
683 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
684 set $m
685 # Prepend the machine's FPU directory unless --without-fp.
686 if test "$with_fp" = yes; then
687 mach="$mach /$1/fpu"
688 else
689 mach="$mach /$1/nofpu"
690 fi
691 mach="$mach /$1"
692 tail="$2"
693 done
695 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
696 changequote([,])dnl
698 # Find what sysdep directories exist.
699 sysnames_add_ons=
700 sysnames=
701 for b in $base ''; do
702 for m0 in $mach ''; do
703 for v in /$vendor ''; do
704 test "$v" = / && continue
705 for o in /$ostry ''; do
706 test "$o" = / && continue
707 for m in $multi_arch_d $mach ''; do
708 for d in $add_ons_pfx ''; do
709 for a in $add_ons_sfx ''; do
710 if test -n "$m0$m0sub$b$v$o$m$msub"; then
711 try_srcdir="${srcdir}/"
712 case "$d" in
713 /*) try_srcdir= ;;
714 esac
715 try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
716 test -n "$enable_debug_configure" &&
717 echo "$0 [DEBUG]: try $try" >&2
718 if test -d "$try_srcdir$try"; then
719 sysnames="$sysnames $try"
720 { test -n "$o" || test -n "$b"; } && os_used=t
721 { test -n "$m" || test -n "$m0"; } && machine_used=t
722 case x${m0:-$m} in
723 x*/$submachine) submachine_used=t ;;
724 esac
725 if test -n "$d"; then
726 case "$sysnames_add_ons" in
727 *" $d "*) ;;
728 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
729 esac
730 fi
731 fi
732 fi
733 done
734 done
735 done
736 done
737 done
738 done
739 done
741 # If the assembler supports gnu_indirect_function symbol type and the
742 # architecture supports multi-arch, we enable multi-arch by default.
743 case $sysnames_add_ons$sysnames in
744 *"$multi_arch_d"*)
745 ;;
746 *)
747 test x"$multi_arch" = xdefault && multi_arch=no
748 ;;
749 esac
750 if test x"$multi_arch" != xno; then
751 AC_DEFINE(USE_MULTIARCH)
752 fi
753 AC_SUBST(multi_arch)
755 if test -z "$os_used" && test "$os" != none; then
756 AC_MSG_ERROR(Operating system $os is not supported.)
757 fi
758 if test -z "$machine_used" && test "$machine" != none; then
759 AC_MSG_ERROR(The $machine is not supported.)
760 fi
761 if test -z "$submachine_used" && test -n "$submachine"; then
762 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
763 fi
764 AC_SUBST(submachine)
766 # We have now validated the configuration.
768 # Expand the list of system names into a full list of directories
769 # from each element's parent name and Implies file (if present).
770 set $sysnames
771 names=
772 while test $# -gt 0; do
773 name=$1
774 shift
776 case " $names " in *" $name "*)
777 # Already in the list.
778 continue
779 esac
781 # Report each name as we discover it, so there is no long pause in output.
782 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
784 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
786 case $name in
787 /*) xsrcdir= ;;
788 *) xsrcdir=$srcdir/ ;;
789 esac
790 test -n "$enable_debug_configure" &&
791 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
793 for implies_file in Implies Implies-before Implies-after; do
794 implies_type=`echo $implies_file | sed s/-/_/`
795 eval ${implies_type}=
796 if test -f $xsrcdir$name/$implies_file; then
797 # Collect more names from the `Implies' file (removing comments).
798 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
799 for x in $implied_candidate; do
800 found=no
801 if test -d $xsrcdir$name_base/$x; then
802 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
803 found=yes
804 fi
805 for d in $add_ons_pfx ''; do
806 try="${d}sysdeps/$x"
807 case $d in
808 /*) try_srcdir= ;;
809 *) try_srcdir=$srcdir/ ;;
810 esac
811 test -n "$enable_debug_configure" &&
812 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
813 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
814 then
815 eval "${implies_type}=\"\$${implies_type} \$try\""
816 found=yes
817 case "$sysnames_add_ons" in
818 *" $d "*) ;;
819 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
820 esac
821 fi
822 done
823 if test $found = no; then
824 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
825 fi
826 done
827 fi
828 done
830 # Add NAME to the list of names.
831 names="$names $name"
833 # Find the parent of NAME, using the empty string if it has none.
834 changequote(,)dnl
835 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
836 changequote([,])dnl
838 test -n "$enable_debug_configure" &&
839 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
840 Implies_before='$Implies_after' Implies_after='$Implies_after'" >&2
842 # Add the names implied by NAME, and NAME's parent (if it has one), to
843 # the list of names to be processed (the argument list). We prepend the
844 # implied names to the list and append the parent. We want implied
845 # directories to come before further directories inferred from the
846 # configuration components; this ensures that for sysv4, unix/common
847 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
848 # after sysv4).
849 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
850 test -n "$sysnames" && set $sysnames
851 done
853 # Add the default directories.
854 default_sysnames="sysdeps/generic"
855 sysnames="$names $default_sysnames"
856 AC_SUBST(sysnames)
857 # The other names were emitted during the scan.
858 AC_MSG_RESULT($default_sysnames)
860 # Collect the list of add-ons that supply partial sysdeps trees.
861 sysdeps_add_ons=
862 for add_on in $add_ons; do
863 case "$add_on" in
864 /*) xsrcdir= ;;
865 *) xsrcdir="$srcdir/" ;;
866 esac
868 test -d "$xsrcdir$add_on/sysdeps" || {
869 case "$configured_add_ons " in
870 *" $add_on "*) ;;
871 *|'')
872 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
873 ;;
874 esac
875 continue
876 }
878 sysdeps_add_ons="$sysdeps_add_ons $add_on"
879 case "$sysnames_add_ons" in
880 *" $add_on/ "*) ;;
881 *|'')
882 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
883 continue ;;
884 esac
886 found=no
887 for d in $sysnames; do
888 case "$d" in
889 $add_on/sysdeps/*) ;;
890 *) continue ;;
891 esac
892 (cd "$xsrcdir$d" && for f in *[[!~]]; do
893 case "$f" in
894 sys|bits)
895 for ff in $f/*.h; do
896 test -d "$ff" || { test -e "$ff" && exit 88; }
897 done
898 ;;
899 *)
900 test -d "$f" || { test -e "$f" && exit 88; }
901 ;;
902 esac
903 done)
904 if test $? -eq 88; then
905 found=yes
906 break
907 fi
908 done
909 if test $found = no; then
910 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
911 fi
912 done
913 AC_SUBST(sysdeps_add_ons)
916 ### Locate tools.
918 AC_PROG_INSTALL
919 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
920 # The makefiles need to use a different form to find it in $srcdir.
921 INSTALL='\$(..)./scripts/install-sh -c'
922 fi
923 AC_PROG_LN_S
925 LIBC_PROG_BINUTILS
926 AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
928 # Accept binutils 2.20 or newer.
929 AC_CHECK_PROG_VER(AS, $AS, --version,
930 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
931 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
932 AC_CHECK_PROG_VER(LD, $LD, --version,
933 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
934 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
936 # These programs are version sensitive.
937 AC_CHECK_TOOL_PREFIX
938 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
939 [version \([egcygnustpi-]*[0-9.]*\)], [4.[3-9].* | 4.[1-9][0-9].* | [5-9].* ],
940 critic_missing="$critic_missing gcc")
941 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
942 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
943 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
945 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
946 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
947 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
948 MSGFMT=: aux_missing="$aux_missing msgfmt")
949 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
950 [GNU texinfo.* \([0-9][0-9.]*\)],
951 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
952 MAKEINFO=: aux_missing="$aux_missing makeinfo")
953 AC_CHECK_PROG_VER(SED, sed, --version,
954 [GNU sed version \([0-9]*\.[0-9.]*\)],
955 [3.0[2-9]*|3.[1-9]*|[4-9]*],
956 SED=: aux_missing="$aux_missing sed")
958 AC_CHECK_TOOL(READELF, readelf, false)
959 AC_CHECK_TOOL(NM, nm, false)
961 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
962 case "x$AUTOCONF" in
963 xno|x|x:) AUTOCONF=no ;;
964 *)
965 AC_CACHE_CHECK(dnl
966 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
967 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
968 libc_cv_autoconf_works=yes
969 else
970 libc_cv_autoconf_works=no
971 fi])
972 test $libc_cv_autoconf_works = yes || AUTOCONF=no
973 ;;
974 esac
975 if test "x$AUTOCONF" = xno; then
976 aux_missing="$aux_missing autoconf"
977 fi
979 test -n "$critic_missing" && AC_MSG_ERROR([
980 *** These critical programs are missing or too old:$critic_missing
981 *** Check the INSTALL file for required versions.])
983 test -n "$aux_missing" && AC_MSG_WARN([
984 *** These auxiliary programs are missing or incompatible versions:$aux_missing
985 *** some features will be disabled.
986 *** Check the INSTALL file for required versions.])
988 # if using special system headers, find out the compiler's sekrit
989 # header directory and add that to the list. NOTE: Only does the right
990 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
991 if test -n "$sysheaders"; then
992 SYSINCLUDES=-nostdinc
993 for d in include include-fixed; do
994 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
995 SYSINCLUDES="$SYSINCLUDES -isystem $i"
996 done
997 SYSINCLUDES="$SYSINCLUDES \
998 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
999 if test -n "$CXX"; then
1000 CXX_SYSINCLUDES=
1001 cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
1002 cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
1003 for d in include "$cxxmachine/include"; do
1004 i=../../../../$d/c++/$cxxversion
1005 cxxheaders=`$CXX -print-file-name="$i"` &&
1006 test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
1007 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
1008 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
1009 done
1010 fi
1011 fi
1012 AC_SUBST(SYSINCLUDES)
1013 AC_SUBST(CXX_SYSINCLUDES)
1015 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1016 # since this would lead to problems installing/building glibc.
1017 # LD_LIBRARY_PATH contains the current directory if one of the following
1018 # is true:
1019 # - one of the terminals (":" and ";") is the first or last sign
1020 # - two terminals occur directly after each other
1021 # - the path contains an element with a dot in it
1022 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1023 changequote(,)dnl
1024 case ${LD_LIBRARY_PATH} in
1025 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1026 ld_library_path_setting="contains current directory"
1027 ;;
1028 *)
1029 ld_library_path_setting="ok"
1030 ;;
1031 esac
1032 changequote([,])dnl
1033 AC_MSG_RESULT($ld_library_path_setting)
1034 if test "$ld_library_path_setting" != "ok"; then
1035 AC_MSG_ERROR([
1036 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1037 *** building glibc. Please change the environment variable
1038 *** and run configure again.])
1039 fi
1041 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1042 if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
1043 libc_cv_gcc_static_libgcc=
1044 else
1045 libc_cv_gcc_static_libgcc=-static-libgcc
1046 fi])
1047 AC_SUBST(libc_cv_gcc_static_libgcc)
1049 AC_PATH_PROG(BASH_SHELL, bash, no)
1050 if test "$BASH_SHELL" != no &&
1051 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1052 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1053 libc_cv_have_bash2=yes
1054 else
1055 libc_cv_have_bash2=no
1056 fi
1057 AC_SUBST(libc_cv_have_bash2)
1059 dnl We need a ksh compatible shell for tzselect.
1060 if test "$BASH_SHELL" = no; then
1061 AC_PATH_PROG(KSH, ksh, no)
1062 if test "$KSH" = no; then
1063 libc_cv_have_ksh=no
1064 else
1065 libc_cv_have_ksh=yes
1066 fi
1067 else
1068 KSH="$BASH_SHELL"
1069 AC_SUBST(KSH)
1070 libc_cv_have_ksh=yes
1071 fi
1072 AC_SUBST(libc_cv_have_ksh)
1074 AC_PROG_AWK
1075 AC_PATH_PROG(PERL, perl, no)
1076 if test "$PERL" != no &&
1077 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1078 PERL=no
1079 fi
1080 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1081 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1082 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1084 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1085 AC_TRY_COMPILE(dnl
1086 [#define __need_size_t
1087 #define __need_wchar_t
1088 #include <stddef.h>
1089 #define __need_NULL
1090 #include <stddef.h>], [size_t size; wchar_t wchar;
1091 #ifdef offsetof
1092 #error stddef.h ignored __need_*
1093 #endif
1094 if (&size == NULL || &wchar == NULL) abort ();],
1095 libc_cv_friendly_stddef=yes,
1096 libc_cv_friendly_stddef=no)])
1097 if test $libc_cv_friendly_stddef = yes; then
1098 config_vars="$config_vars
1099 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1100 fi
1102 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1103 libc_cv_need_minus_P, [dnl
1104 cat > conftest.S <<EOF
1105 #include "confdefs.h"
1106 /* Nothing whatsoever. */
1107 EOF
1108 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1109 libc_cv_need_minus_P=no
1110 else
1111 libc_cv_need_minus_P=yes
1112 fi
1113 rm -f conftest*])
1114 if test $libc_cv_need_minus_P = yes; then
1115 config_vars="$config_vars
1116 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1117 fi
1119 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1120 cat > conftest.s <<EOF
1121 ${libc_cv_dot_text}
1122 foo:
1123 .set glibc_conftest_frobozz,foo
1124 $libc_cv_asm_global_directive glibc_conftest_frobozz
1125 EOF
1126 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1127 # (but it doesn't work), so we must do a linking check to be sure.
1128 cat > conftest1.c <<\EOF
1129 extern int glibc_conftest_frobozz;
1130 void _start() { glibc_conftest_frobozz = 1; }
1131 EOF
1132 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1133 -nostartfiles -nostdlib \
1134 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1135 libc_cv_asm_set_directive=yes
1136 else
1137 libc_cv_asm_set_directive=no
1138 fi
1139 rm -f conftest*])
1140 if test $libc_cv_asm_set_directive = yes; then
1141 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1142 fi
1144 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1145 libc_cv_asm_unique_object, [dnl
1146 cat > conftest.s <<EOF
1147 ${libc_cv_dot_text}
1148 _sym:
1149 .type _sym, ${libc_cv_asm_type_prefix}gnu_unique_object
1150 EOF
1151 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1152 libc_cv_asm_unique_object=yes
1153 else
1154 libc_cv_asm_unique_object=no
1155 fi
1156 rm -f conftest*])
1157 if test $libc_cv_asm_unique_object = yes; then
1158 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1159 fi
1161 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1162 [cat > conftest.s <<EOF
1163 ${libc_cv_dot_text}
1164 _sym:
1165 .symver _sym,sym@VERS
1166 EOF
1167 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1168 libc_cv_asm_symver_directive=yes
1169 else
1170 libc_cv_asm_symver_directive=no
1171 fi
1172 rm -f conftest*])
1173 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1174 if test $libc_cv_asm_symver_directive = yes; then
1175 cat > conftest.s <<EOF
1176 ${libc_cv_dot_text}
1177 _sym:
1178 .symver _sym,sym@VERS
1179 EOF
1180 cat > conftest.map <<EOF
1181 VERS_1 {
1182 global: sym;
1183 };
1185 VERS_2 {
1186 global: sym;
1187 } VERS_1;
1188 EOF
1189 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1190 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1191 -o conftest.so conftest.o
1192 -nostartfiles -nostdlib
1193 -Wl,--version-script,conftest.map
1194 1>&AS_MESSAGE_LOG_FD]);
1195 then
1196 libc_cv_ld_version_script_option=yes
1197 else
1198 libc_cv_ld_version_script_option=no
1199 fi
1200 else
1201 libc_cv_ld_version_script_option=no
1202 fi
1203 else
1204 libc_cv_ld_version_script_option=no
1205 fi
1206 rm -f conftest*])
1207 if test $shared != no &&
1208 test $libc_cv_asm_symver_directive = yes &&
1209 test $libc_cv_ld_version_script_option = yes &&
1210 test $enable_versioning = yes; then
1211 VERSIONING=yes
1212 AC_DEFINE(DO_VERSIONING)
1213 else
1214 VERSIONING=no
1215 fi
1216 AC_SUBST(VERSIONING)
1218 if test $shared != no && test $VERSIONING = no; then
1219 echo "\
1220 *** WARNING: You should not compile GNU libc without versioning. Not using
1221 *** versioning will introduce incompatibilities so that old binaries
1222 *** will not run anymore.
1223 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1224 fi
1225 AC_CACHE_CHECK(for .previous assembler directive,
1226 libc_cv_asm_previous_directive, [dnl
1227 cat > conftest.s <<EOF
1228 .section foo_section
1229 .previous
1230 EOF
1231 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1232 libc_cv_asm_previous_directive=yes
1233 else
1234 libc_cv_asm_previous_directive=no
1235 fi
1236 rm -f conftest*])
1237 if test $libc_cv_asm_previous_directive = yes; then
1238 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1239 else
1240 AC_CACHE_CHECK(for .popsection assembler directive,
1241 libc_cv_asm_popsection_directive, [dnl
1242 cat > conftest.s <<EOF
1243 .pushsection foo_section
1244 .popsection
1245 EOF
1246 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1247 libc_cv_asm_popsection_directive=yes
1248 else
1249 libc_cv_asm_popsection_directive=no
1250 fi
1251 rm -f conftest*])
1252 if test $libc_cv_asm_popsection_directive = yes; then
1253 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1254 fi
1255 fi
1256 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1257 libc_cv_asm_protected_directive, [dnl
1258 cat > conftest.s <<EOF
1259 .protected foo
1260 foo:
1261 .hidden bar
1262 bar:
1263 EOF
1264 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1265 libc_cv_asm_protected_directive=yes
1266 else
1267 AC_MSG_ERROR(assembler support for symbol visibility is required)
1268 fi
1269 rm -f conftest*])
1271 if test $libc_cv_asm_protected_directive = yes; then
1272 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1273 libc_cv_visibility_attribute,
1274 [cat > conftest.c <<EOF
1275 int foo __attribute__ ((visibility ("hidden"))) = 1;
1276 int bar __attribute__ ((visibility ("protected"))) = 1;
1277 EOF
1278 libc_cv_visibility_attribute=no
1279 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1280 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1281 if grep '\.protected.*bar' conftest.s >/dev/null; then
1282 libc_cv_visibility_attribute=yes
1283 fi
1284 fi
1285 fi
1286 rm -f conftest.{c,s}
1287 ])
1288 if test $libc_cv_visibility_attribute != yes; then
1289 AC_MSG_ERROR(compiler support for visibility attribute is required)
1290 fi
1291 fi
1293 if test $libc_cv_visibility_attribute = yes; then
1294 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1295 libc_cv_broken_visibility_attribute,
1296 [cat > conftest.c <<EOF
1297 int foo (int x);
1298 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1299 int bar (int x) { return x; }
1300 EOF
1301 libc_cv_broken_visibility_attribute=yes
1302 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1303 changequote(,)dnl
1304 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1305 changequote([,])dnl
1306 libc_cv_broken_visibility_attribute=no
1307 fi
1308 fi
1309 rm -f conftest.c conftest.s
1310 ])
1311 if test $libc_cv_broken_visibility_attribute = yes; then
1312 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1313 fi
1314 fi
1316 AC_CACHE_CHECK(for broken __attribute__((alias())),
1317 libc_cv_broken_alias_attribute,
1318 [cat > conftest.c <<EOF
1319 extern int foo (int x) __asm ("xyzzy");
1320 int bar (int x) { return x; }
1321 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1322 extern int dfoo;
1323 extern __typeof (dfoo) dfoo __asm ("abccb");
1324 int dfoo = 1;
1325 EOF
1326 libc_cv_broken_alias_attribute=yes
1327 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1328 if grep 'xyzzy' conftest.s >/dev/null &&
1329 grep 'abccb' conftest.s >/dev/null; then
1330 libc_cv_broken_alias_attribute=no
1331 fi
1332 fi
1333 rm -f conftest.c conftest.s
1334 ])
1335 if test $libc_cv_broken_alias_attribute = yes; then
1336 AC_MSG_ERROR(working alias attribute support required)
1337 fi
1339 if test $libc_cv_visibility_attribute = yes; then
1340 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1341 libc_cv_have_sdata_section,
1342 [echo "int i;" > conftest.c
1343 libc_cv_have_sdata_section=no
1344 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1345 | grep '\.sdata' >/dev/null; then
1346 libc_cv_have_sdata_section=yes
1347 fi
1348 rm -f conftest.c conftest.so
1349 ])
1350 if test $libc_cv_have_sdata_section = yes; then
1351 AC_DEFINE(HAVE_SDATA_SECTION)
1352 fi
1353 fi
1355 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1356 libc_cv_initfini_array, [dnl
1357 LIBC_TRY_LINK_STATIC([
1358 int foo (void) { return 1; }
1359 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1360 ],
1361 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1362 libc_cv_initfini_array=yes
1363 else
1364 libc_cv_initfini_array=no
1365 fi],
1366 [libc_cv_initfini_array=no])
1367 ])
1368 if test $libc_cv_initfini_array != yes; then
1369 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1370 fi
1372 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1373 libc_cv_ctors_header, [dnl
1374 libc_cv_ctors_header=yes
1375 LIBC_TRY_LINK_STATIC([
1376 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1377 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1378 ],
1379 [dnl
1380 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1381 { gsub(/\@<:@ */, "@<:@") }
1382 $2 == ".ctors" || $2 == ".dtors" {
1383 size = strtonum("0x" $6)
1384 align = strtonum("0x" $NF)
1385 seen@<:@$2@:>@ = 1
1386 stub@<:@$2@:>@ = size == align * 2
1387 }
1388 END {
1389 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1390 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1391 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1392 }
1393 '], [libc_cv_ctors_header=no])
1394 ], [dnl
1395 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1396 ])
1397 ])
1398 if test $libc_cv_ctors_header = no; then
1399 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1400 fi
1402 AC_CACHE_CHECK(for libunwind-support in compiler,
1403 libc_cv_cc_with_libunwind, [
1404 cat > conftest.c <<EOF
1405 int main (void) { return 0; }
1406 EOF
1407 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1408 conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
1409 libc_cv_cc_with_libunwind=yes
1410 else
1411 libc_cv_cc_with_libunwind=no
1412 fi
1413 rm -f conftest*])
1414 AC_SUBST(libc_cv_cc_with_libunwind)
1415 if test $libc_cv_cc_with_libunwind = yes; then
1416 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1417 fi
1419 AC_CACHE_CHECK(for -z nodelete option,
1420 libc_cv_z_nodelete, [dnl
1421 cat > conftest.c <<EOF
1422 int _start (void) { return 42; }
1423 EOF
1424 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1425 -fPIC -shared -o conftest.so conftest.c
1426 -nostartfiles -nostdlib
1427 -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1428 then
1429 libc_cv_z_nodelete=yes
1430 else
1431 AC_MSG_ERROR(linker with -z nodelete support required)
1432 fi
1433 rm -f conftest*])
1435 AC_CACHE_CHECK(for -z nodlopen option,
1436 libc_cv_z_nodlopen, [dnl
1437 cat > conftest.c <<EOF
1438 int _start (void) { return 42; }
1439 EOF
1440 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1441 -fPIC -shared -o conftest.so conftest.c
1442 -nostartfiles -nostdlib
1443 -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1444 then
1445 libc_cv_z_nodlopen=yes
1446 else
1447 AC_MSG_ERROR(linker with -z nodlopen support required)
1448 fi
1449 rm -f conftest*])
1451 AC_CACHE_CHECK(for -z initfirst option,
1452 libc_cv_z_initfirst, [dnl
1453 cat > conftest.c <<EOF
1454 int _start (void) { return 42; }
1455 EOF
1456 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1457 -fPIC -shared -o conftest.so conftest.c
1458 -nostartfiles -nostdlib
1459 -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1460 then
1461 libc_cv_z_initfirst=yes
1462 else
1463 AC_MSG_ERROR(linker with -z initfirst support required)
1464 fi
1465 rm -f conftest*])
1467 # Add-on fragments can set these for other machines.
1468 libc_commonpagesize=${libc_commonpagesize:-no}
1469 libc_relro_required=${libc_relro_required:-no}
1470 case "$base_machine" in
1471 i[[34567]]86 | x86_64 | powerpc* | s390*)
1472 libc_commonpagesize=0x1000
1473 libc_relro_required=yes
1474 ;;
1475 sparc*)
1476 libc_commonpagesize=0x2000
1477 libc_relro_required=yes
1478 ;;
1479 esac
1481 if test $libc_commonpagesize != no; then
1482 AC_CACHE_CHECK(for -z relro option,
1483 libc_cv_z_relro, [dnl
1484 libc_cv_z_relro=no
1485 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1486 int _start (void) { return 42; }
1487 extern void _exit (int);
1488 /* Since these pointers are const, they should go in rodata.
1489 Since they refer to functions that have to be resolved by
1490 dynamic linking, they should instead go in RELRO data. */
1491 const void *const relro[] = { &_start, &_exit, 0 };
1492 /* GNU ld fails to produce RELRO data when it's very small and there is no
1493 normal writable data following it, or if only uninitialized (.bss) data
1494 follows it, or only very small writable data. */
1495 int data[0x10000] = { 1, };
1496 ]])])
1497 cat > conftest.awk <<\EOF
1498 BEGIN {
1499 result = "no"
1500 commonpagesize = strtonum(commonpagesize)
1501 }
1502 { print "LINE:", $0 > "/dev/stderr" }
1503 $1 == "GNU_RELRO" {
1504 vaddr = strtonum($3)
1505 memsz = strtonum($6)
1506 end = vaddr + memsz
1507 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1508 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1509 result = (end % commonpagesize == 0) ? "yes" : "broken"
1510 }
1511 END { print result }
1512 EOF
1513 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1514 -fPIC -shared -o conftest.so conftest.c
1515 -nostartfiles -nostdlib
1516 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1517 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1518 AC_TRY_COMMAND([
1519 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1520 conftest.ph > conftest.cps
1521 ]) &&
1522 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1523 rm -f conftest*])
1524 if { test "x$libc_relro_required" = xyes &&
1525 test "x$libc_cv_z_relro" != xyes
1526 }
1527 then
1528 AC_MSG_ERROR(linker with -z relro support required)
1529 fi
1530 else
1531 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1532 fi
1534 AC_CACHE_CHECK(for -Bgroup option,
1535 libc_cv_Bgroup, [dnl
1536 cat > conftest.c <<EOF
1537 int _start (void) { return 42; }
1538 EOF
1539 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1540 -fPIC -shared -o conftest.so conftest.c
1541 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1542 then
1543 libc_cv_Bgroup=yes
1544 else
1545 libc_cv_Bgroup=no
1546 fi
1547 rm -f conftest*])
1548 AC_SUBST(libc_cv_Bgroup)
1550 ASFLAGS_config=
1551 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1552 libc_cv_as_noexecstack, [dnl
1553 cat > conftest.c <<EOF
1554 void foo (void) { }
1555 EOF
1556 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1557 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1558 && grep -q .note.GNU-stack conftest.s \
1559 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1560 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1561 then
1562 libc_cv_as_noexecstack=yes
1563 else
1564 libc_cv_as_noexecstack=no
1565 fi
1566 rm -f conftest*])
1567 if test $libc_cv_as_noexecstack = yes; then
1568 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1569 fi
1570 AC_SUBST(ASFLAGS_config)
1572 AC_CACHE_CHECK(for -z combreloc,
1573 libc_cv_z_combreloc, [dnl
1574 cat > conftest.c <<EOF
1575 extern int bar (int);
1576 extern int mumble;
1577 int foo (void) { return bar (mumble); }
1578 EOF
1579 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1580 -fPIC -shared -o conftest.so conftest.c
1581 -nostdlib -nostartfiles
1582 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1583 then
1584 dnl The following test is a bit weak. We must use a tool which can test
1585 dnl cross-platform since the gcc used can be a cross compiler. Without
1586 dnl introducing new options this is not easily doable. Instead use a tool
1587 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1588 dnl look for a section named .rel.dyn.
1589 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1590 libc_cv_z_combreloc=yes
1591 else
1592 libc_cv_z_combreloc=no
1593 fi
1594 else
1595 libc_cv_z_combreloc=no
1596 fi
1597 rm -f conftest*])
1598 if test "$libc_cv_z_combreloc" = yes; then
1599 AC_DEFINE(HAVE_Z_COMBRELOC)
1600 fi
1601 AC_SUBST(libc_cv_z_combreloc)
1603 AC_CACHE_CHECK(for -z execstack,
1604 libc_cv_z_execstack, [dnl
1605 cat > conftest.c <<EOF
1606 int _start (void) { return 42; }
1607 EOF
1608 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1609 -fPIC -shared -o conftest.so conftest.c
1610 -Wl,-z,execstack -nostdlib
1611 1>&AS_MESSAGE_LOG_FD])
1612 then
1613 libc_cv_z_execstack=yes
1614 else
1615 libc_cv_z_execstack=no
1616 fi
1617 rm -f conftest*])
1618 AC_SUBST(libc_cv_z_execstack)
1620 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1621 cat > conftest.c <<EOF
1622 int foo;
1623 main () { return 0;}
1624 EOF
1625 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -fpie
1626 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD])
1627 then
1628 libc_cv_fpie=yes
1629 else
1630 libc_cv_fpie=no
1631 fi
1632 rm -f conftest*])
1634 AC_SUBST(libc_cv_fpie)
1636 AC_CACHE_CHECK(for --hash-style option,
1637 libc_cv_hashstyle, [dnl
1638 cat > conftest.c <<EOF
1639 int _start (void) { return 42; }
1640 EOF
1641 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1642 -fPIC -shared -o conftest.so conftest.c
1643 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1644 then
1645 libc_cv_hashstyle=yes
1646 else
1647 libc_cv_hashstyle=no
1648 fi
1649 rm -f conftest*])
1650 AC_SUBST(libc_cv_hashstyle)
1652 # The linker's default -shared behavior is good enough if it
1653 # does these things that our custom linker scripts ensure that
1654 # all allocated NOTE sections come first.
1655 if test "$use_default_link" = default; then
1656 AC_CACHE_CHECK([for sufficient default -shared layout],
1657 libc_cv_use_default_link, [dnl
1658 libc_cv_use_default_link=no
1659 cat > conftest.s <<\EOF
1660 .section .note.a,"a",%note
1661 .balign 4
1662 .long 4,4,9
1663 .string "GNU"
1664 .string "foo"
1665 .section .note.b,"a",%note
1666 .balign 4
1667 .long 4,4,9
1668 .string "GNU"
1669 .string "bar"
1670 EOF
1671 if AC_TRY_COMMAND([dnl
1672 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1673 ac_try=`$READELF -S conftest.so | sed -n \
1674 ['${x;p;}
1675 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1676 t a
1677 b
1678 : a
1679 H']`
1680 then
1681 libc_seen_a=no libc_seen_b=no
1682 set -- $ac_try
1683 while test $# -ge 2 -a "$1" = NOTE; do
1684 case "$2" in
1685 .note.a) libc_seen_a=yes ;;
1686 .note.b) libc_seen_b=yes ;;
1687 esac
1688 shift 2
1689 done
1690 case "$libc_seen_a$libc_seen_b" in
1691 yesyes)
1692 libc_cv_use_default_link=yes
1693 ;;
1694 *)
1695 echo >&AS_MESSAGE_LOG_FD "\
1696 $libc_seen_a$libc_seen_b from:
1697 $ac_try"
1698 ;;
1699 esac
1700 fi
1701 rm -f conftest*])
1702 use_default_link=$libc_cv_use_default_link
1703 fi
1705 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1706 if libc_cv_output_format=`
1707 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1708 then
1709 :
1710 else
1711 libc_cv_output_format=
1712 fi
1713 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1714 AC_SUBST(libc_cv_output_format)
1716 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1717 cat > conftest.c <<EOF
1718 int foo;
1719 EOF
1720 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1721 conftest.c 1>&AS_MESSAGE_LOG_FD])
1722 then
1723 libc_cv_fno_toplevel_reorder=yes
1724 else
1725 libc_cv_fno_toplevel_reorder=no
1726 fi
1727 rm -f conftest*])
1728 if test $libc_cv_fno_toplevel_reorder = yes; then
1729 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1730 else
1731 fno_unit_at_a_time=-fno-unit-at-a-time
1732 fi
1733 AC_SUBST(fno_unit_at_a_time)
1735 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1736 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1737 [libc_cv_ssp=yes],
1738 [libc_cv_ssp=no])
1739 ])
1740 AC_SUBST(libc_cv_ssp)
1742 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1743 cat > conftest.c <<EOF
1744 int foo;
1745 #ifdef __GNUC_GNU_INLINE__
1746 main () { return 0;}
1747 #else
1748 #error
1749 #endif
1750 EOF
1751 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1752 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1753 then
1754 libc_cv_gnu89_inline=yes
1755 else
1756 libc_cv_gnu89_inline=no
1757 fi
1758 rm -f conftest*])
1759 if test $libc_cv_gnu89_inline = yes; then
1760 gnu89_inline=-fgnu89-inline
1761 else
1762 gnu89_inline=
1763 fi
1764 AC_SUBST(gnu89_inline)
1766 AC_CACHE_CHECK(whether cc puts quotes around section names,
1767 libc_cv_have_section_quotes,
1768 [cat > conftest.c <<EOF
1769 static const int foo
1770 __attribute__ ((section ("bar"))) = 1;
1771 EOF
1772 if ${CC-cc} -S conftest.c -o conftest.s; then
1773 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1774 libc_cv_have_section_quotes=yes
1775 else
1776 libc_cv_have_section_quotes=no
1777 fi
1778 else
1779 libc_cv_have_section_quotes=unknown
1780 fi
1781 rm -f conftest.{c,s}
1782 ])
1783 if test $libc_cv_have_section_quotes = yes; then
1784 AC_DEFINE(HAVE_SECTION_QUOTES)
1785 fi
1787 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1788 [dnl
1789 cat > conftest.s <<EOF
1790 ${libc_cv_dot_text}
1791 ${libc_cv_asm_global_directive} foo
1792 foo:
1793 .weak foo
1794 .weak bar; bar = foo
1795 EOF
1796 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1797 libc_cv_asm_weak_directive=yes
1798 else
1799 libc_cv_asm_weak_directive=no
1800 fi
1801 rm -f conftest*])
1803 if test $libc_cv_asm_weak_directive = no; then
1804 AC_CACHE_CHECK(for assembler .weakext directive,
1805 libc_cv_asm_weakext_directive,
1806 [dnl
1807 cat > conftest.s <<EOF
1808 ${libc_cv_dot_text}
1809 ${libc_cv_asm_global_directive} foo
1810 foo:
1811 .weakext bar foo
1812 .weakext baz
1813 ${libc_cv_asm_global_directive} baz
1814 baz:
1815 EOF
1816 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1817 libc_cv_asm_weakext_directive=yes
1818 else
1819 libc_cv_asm_weakext_directive=no
1820 fi
1821 rm -f conftest*])
1823 fi # no .weak
1825 if test $libc_cv_asm_weak_directive = yes; then
1826 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1827 elif test $libc_cv_asm_weakext_directive = yes; then
1828 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1829 fi
1831 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1832 case $machine in
1833 sparc/sparc64*) cfi_offset=2047;;
1834 *) cfi_offset=0;;
1835 esac
1836 cat > conftest.s <<EOF
1837 .text
1838 .type func,%function
1839 func:
1840 .cfi_startproc
1841 .cfi_remember_state
1842 .cfi_rel_offset 1, $cfi_offset
1843 .cfi_endproc
1844 EOF
1845 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1846 libc_cv_asm_cfi_directives=yes
1847 else
1848 libc_cv_asm_cfi_directives=no
1849 fi
1850 rm -f conftest*])
1851 if test $libc_cv_asm_cfi_directives = yes; then
1852 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1853 fi
1855 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1856 cat > conftest.c <<\EOF
1857 _start () {}
1858 int __eh_pc;
1859 __throw () {}
1860 EOF
1861 dnl No \ in command here because it ends up inside ''.
1862 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1863 -nostdlib -nostartfiles -Wl,--no-whole-archive
1864 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1865 libc_cv_ld_no_whole_archive=yes
1866 else
1867 libc_cv_ld_no_whole_archive=no
1868 fi
1869 rm -f conftest*])
1870 if test $libc_cv_ld_no_whole_archive = no; then
1871 AC_MSG_ERROR([support for --no-whole-archive is needed])
1872 fi
1874 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1875 cat > conftest.c <<\EOF
1876 _start () {}
1877 int __eh_pc;
1878 __throw () {}
1879 EOF
1880 dnl No \ in command here because it ends up inside ''.
1881 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1882 -nostdlib -nostartfiles -fexceptions
1883 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1884 libc_cv_gcc_exceptions=yes
1885 else
1886 libc_cv_gcc_exceptions=no
1887 fi
1888 rm -f conftest*])
1889 if test $libc_cv_gcc_exceptions = yes; then
1890 exceptions=-fexceptions
1891 fi
1892 AC_SUBST(exceptions)dnl
1894 if test "$host_cpu" = powerpc ; then
1895 # Check for a bug present in at least versions 2.8.x of GCC
1896 # and versions 1.0.x of EGCS.
1897 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1898 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1899 libc_cv_c_asmcr0_bug='no',
1900 libc_cv_c_asmcr0_bug='yes')])
1901 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1902 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1903 fi
1904 fi
1906 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1907 cat > conftest.c <<\EOF
1908 void zero (void *x)
1909 {
1910 __builtin_memset (x, 0, 1000);
1911 }
1912 EOF
1913 dnl
1914 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1915 then
1916 libc_cv_gcc_builtin_memset=no
1917 else
1918 libc_cv_gcc_builtin_memset=yes
1919 fi
1920 rm -f conftest* ])
1921 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1922 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1923 fi
1925 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1926 cat > conftest.c <<\EOF
1927 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1928 char *foo (const char *a, const char *b)
1929 {
1930 return __builtin_strstr (a, b);
1931 }
1932 EOF
1933 dnl
1934 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1935 then
1936 libc_cv_gcc_builtin_redirection=yes
1937 else
1938 libc_cv_gcc_builtin_redirection=no
1939 fi
1940 rm -f conftest* ])
1941 if test "$libc_cv_gcc_builtin_redirection" = no; then
1942 AC_MSG_ERROR([support for the symbol redirection needed])
1943 fi
1945 dnl Check whether the compiler supports the __thread keyword.
1946 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1947 [cat > conftest.c <<\EOF
1948 __thread int a = 42;
1949 EOF
1950 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1951 libc_cv_gcc___thread=yes
1952 else
1953 libc_cv_gcc___thread=no
1954 fi
1955 rm -f conftest*])
1956 if test "$libc_cv_gcc___thread" = no; then
1957 AC_MSG_ERROR([support for the __thread keyword is required])
1958 fi
1960 dnl Check whether the compiler supports the tls_model attribute.
1961 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1962 cat > conftest.c <<\EOF
1963 extern __thread int a __attribute__((tls_model ("initial-exec")));
1964 EOF
1965 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1966 libc_cv_gcc_tls_model_attr=yes
1967 else
1968 libc_cv_gcc_tls_model_attr=no
1969 fi
1970 rm -f conftest*])
1971 if test "$libc_cv_gcc_tls_model_attr" = no; then
1972 AC_MSG_ERROR([support for the tls_model attribute is required])
1973 fi
1975 dnl Determine how to disable generation of FMA instructions.
1976 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1977 libc_cv_cc_nofma, [dnl
1978 libc_cv_cc_nofma=
1979 for opt in -ffp-contract=off -mno-fused-madd; do
1980 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1981 done])
1983 if test -n "$submachine"; then
1984 AC_CACHE_CHECK([for compiler option for CPU variant],
1985 libc_cv_cc_submachine, [dnl
1986 libc_cv_cc_submachine=no
1987 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1988 LIBC_TRY_CC_OPTION([$opt], [
1989 libc_cv_cc_submachine="$opt"
1990 break], [])
1991 done])
1992 if test "x$libc_cv_cc_submachine" = xno; then
1993 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1994 fi
1995 fi
1996 AC_SUBST(libc_cv_cc_submachine)
1998 dnl Check whether we have the gd library available.
1999 AC_MSG_CHECKING(for libgd)
2000 if test "$with_gd" != "no"; then
2001 old_CFLAGS="$CFLAGS"
2002 CFLAGS="$CFLAGS $libgd_include"
2003 old_LDFLAGS="$LDFLAGS"
2004 LDFLAGS="$LDFLAGS $libgd_ldflags"
2005 old_LIBS="$LIBS"
2006 LIBS="$LIBS -lgd -lpng -lz -lm"
2007 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
2008 CFLAGS="$old_CFLAGS"
2009 LDFLAGS="$old_LDFLAGS"
2010 LIBS="$old_LIBS"
2011 else
2012 LIBGD=no
2013 fi
2014 AC_MSG_RESULT($LIBGD)
2015 AC_SUBST(LIBGD)
2017 # SELinux detection
2018 if test x$with_selinux = xno ; then
2019 have_selinux=no;
2020 else
2021 # See if we have the SELinux library
2022 AC_CHECK_LIB(selinux, is_selinux_enabled,
2023 have_selinux=yes, have_selinux=no)
2024 # See if we have the SELinux header with the NSCD permissions in it.
2025 if test x$have_selinux = xyes ; then
2026 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
2027 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
2028 [#ifdef NSCD__SHMEMHOST
2029 return 0;
2030 #else
2031 #error NSCD__SHMEMHOST not defined
2032 #endif],
2033 have_selinux=yes, have_selinux=no)
2034 AC_MSG_RESULT($have_selinux)
2035 fi
2037 if test x$with_selinux = xyes ; then
2038 if test x$have_selinux = xno ; then
2039 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
2040 fi
2041 fi
2042 fi
2043 # Check if we're building with SELinux support.
2044 if test "x$have_selinux" = xyes; then
2045 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
2047 # See if we have the libaudit library
2048 AC_CHECK_LIB(audit, audit_log_user_avc_message,
2049 have_libaudit=yes, have_libaudit=no)
2050 if test "x$have_libaudit" = xyes; then
2051 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2052 fi
2053 AC_SUBST(have_libaudit)
2055 # See if we have the libcap library
2056 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2057 if test "x$have_libcap" = xyes; then
2058 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2059 fi
2060 AC_SUBST(have_libcap)
2061 fi
2062 AC_SUBST(have_selinux)
2064 dnl check for the size of 'long double'.
2065 AC_CHECK_SIZEOF(long double, 0)
2066 sizeof_long_double=$ac_cv_sizeof_long_double
2067 AC_SUBST(sizeof_long_double)
2069 CPPUNDEFS=
2070 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2071 dnl Since we are building the implementations of the fortified functions here,
2072 dnl having the macro defined interacts very badly.
2073 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2074 [AC_TRY_COMPILE([], [
2075 #ifdef _FORTIFY_SOURCE
2076 # error bogon
2077 #endif],
2078 [libc_cv_predef_fortify_source=no],
2079 [libc_cv_predef_fortify_source=yes])])
2080 if test $libc_cv_predef_fortify_source = yes; then
2081 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2082 fi
2083 AC_SUBST(CPPUNDEFS)
2085 dnl Check for silly hacked compilers inserting -fstack-protector.
2086 dnl This breaks badly for the early startup code we compile, since
2087 dnl the compiled code can refer to a magic machine-dependent location
2088 dnl for the canary value before we have sufficient setup for that to
2089 dnl work. It's also questionable to build all of libc with this flag
2090 dnl even when you're doing that for most applications you build, since
2091 dnl libc's code is so heavily-used and performance-sensitive. If we
2092 dnl ever really want to make that work, it should be enabled explicitly
2093 dnl in the libc build, not inherited from implicit compiler settings.
2094 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2095 libc_cv_predef_stack_protector, [
2096 AC_TRY_COMPILE([extern void foobar (char *);],
2097 [char large_array[2048]; foobar (large_array);], [
2098 libc_undefs=`$NM -u conftest.o |
2099 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2100 2>&AS_MESSAGE_LOG_FD` || {
2101 AC_MSG_ERROR([confusing output from $NM -u])
2102 }
2103 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2104 # On some architectures, there are architecture-specific undefined
2105 # symbols (resolved by the linker), so filter out unknown symbols.
2106 # This will fail to produce the correct result if the compiler
2107 # defaults to -fstack-protector but this produces an undefined symbol
2108 # other than __stack_chk_fail. However, compilers like that have not
2109 # been encountered in practice.
2110 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2111 case "$libc_undefs" in
2112 foobar) libc_cv_predef_stack_protector=no ;;
2113 '__stack_chk_fail
2114 foobar') libc_cv_predef_stack_protector=yes ;;
2115 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2116 esac],
2117 [AC_MSG_ERROR([test compilation failed])])
2118 ])
2119 libc_extra_cflags=
2120 if test $libc_cv_predef_stack_protector = yes; then
2121 libc_extra_cflags=-fno-stack-protector
2122 fi
2123 AC_SUBST(libc_extra_cflags)
2125 ### End of automated tests.
2126 ### Now run sysdeps configure fragments.
2128 # They also can set these variables.
2129 use_ldconfig=no
2130 ldd_rewrite_script=no
2131 libc_cv_sysconfdir=$sysconfdir
2132 libc_cv_gcc_unwind_find_fde=no
2133 libc_cv_idn=no
2135 # Iterate over all the sysdep directories we will use, running their
2136 # configure fragments.
2137 for dir in $sysnames; do
2138 case $dir in
2139 /*) dest=$dir ;;
2140 *) dest=$srcdir/$dir ;;
2141 esac
2142 if test -r $dest/configure; then
2143 AC_MSG_RESULT(running configure fragment for $dir)
2144 . $dest/configure
2145 fi
2146 done
2148 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2149 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2150 fi
2151 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2153 # Test for old glibc 2.0.x headers so that they can be removed properly
2154 # Search only in includedir.
2155 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2156 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2157 then
2158 old_glibc_headers=yes
2159 else
2160 old_glibc_headers=no
2161 fi
2162 AC_MSG_RESULT($old_glibc_headers)
2163 if test ${old_glibc_headers} = yes; then
2164 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2165 AC_MSG_WARN(*** be removed.)
2166 fi
2167 AC_SUBST(old_glibc_headers)
2169 AC_SUBST(libc_cv_slibdir)
2170 AC_SUBST(libc_cv_localedir)
2171 AC_SUBST(libc_cv_sysconfdir)
2172 AC_SUBST(libc_cv_rootsbindir)
2173 AC_SUBST(libc_cv_forced_unwind)
2175 dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
2176 AC_SUBST(libc_cv_cpp_asm_debuginfo)
2177 AC_SUBST(libc_cv_cc_sse4)
2178 AC_SUBST(libc_cv_cc_avx)
2179 AC_SUBST(libc_cv_cc_sse2avx)
2180 AC_SUBST(libc_cv_cc_novzeroupper)
2181 AC_SUBST(libc_cv_cc_fma4)
2182 AC_SUBST(libc_cv_cc_nofma)
2183 AC_SUBST(libc_cv_as_i686)
2184 AC_SUBST(libc_cv_sparc_as_vis3)
2186 AC_SUBST(use_ldconfig)
2187 AC_SUBST(ldd_rewrite_script)
2189 AC_SUBST(static)
2190 AC_SUBST(shared)
2192 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2193 [libc_cv_pic_default=yes
2194 cat > conftest.c <<EOF
2195 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2196 # error PIC is default.
2197 #endif
2198 EOF
2199 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2200 libc_cv_pic_default=no
2201 fi
2202 rm -f conftest.*])
2203 AC_SUBST(libc_cv_pic_default)
2205 AC_SUBST(profile)
2206 AC_SUBST(static_nss)
2208 AC_SUBST(DEFINES)
2210 dnl See sysdeps/mach/configure.in for this variable.
2211 AC_SUBST(mach_interface_list)
2213 if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
2214 config_makefile=
2215 else
2216 config_makefile=Makefile
2217 fi
2219 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2220 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2221 AC_SUBST(VERSION)
2222 AC_SUBST(RELEASE)
2224 AC_CONFIG_FILES([config.make ${config_makefile}])
2225 AC_CONFIG_COMMANDS([default],[[
2226 case $CONFIG_FILES in *config.make*)
2227 echo "$config_vars" >> config.make;;
2228 esac
2229 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2230 AC_OUTPUT