| blob | d8c55b102e5a1c8c76e851c40089760c4a5db81b |
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 dnl This is here so we can set $subdirs directly based on configure fragments.
9 AC_CONFIG_SUBDIRS()
11 AC_CANONICAL_HOST
13 AC_PROG_CC
14 if test $host != $build; then
15 AC_CHECK_PROGS(BUILD_CC, gcc cc)
16 fi
17 AC_SUBST(cross_compiling)
18 AC_PROG_CPP
19 # We need the C++ compiler only for testing.
20 AC_PROG_CXX
22 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
23 AC_MSG_ERROR([you must configure in a separate build directory])
24 fi
26 # This will get text that should go into config.make.
27 config_vars=
29 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
30 AC_ARG_WITH([gd],
31 AC_HELP_STRING([--with-gd=DIR],
32 [find libgd include dir and library with prefix DIR]),
33 [dnl
34 case "$with_gd" in
35 yes|''|no) ;;
36 *) libgd_include="-I$withval/include"
37 libgd_ldflags="-L$withval/lib" ;;
38 esac
39 ])
40 AC_ARG_WITH([gd-include],
41 AC_HELP_STRING([--with-gd-include=DIR],
42 [find libgd include files in DIR]),
43 [dnl
44 case "$with_gd_include" in
45 ''|no) ;;
46 *) libgd_include="-I$withval" ;;
47 esac
48 ])
49 AC_ARG_WITH([gd-lib],
50 AC_HELP_STRING([--with-gd-lib=DIR],
51 [find libgd library files in DIR]),
52 [dnl
53 case "$with_gd_lib" in
54 ''|no) ;;
55 *) libgd_ldflags="-L$withval" ;;
56 esac
57 ])
59 if test -n "$libgd_include"; then
60 config_vars="$config_vars
61 CFLAGS-memusagestat.c = $libgd_include"
62 fi
63 if test -n "$libgd_ldflags"; then
64 config_vars="$config_vars
65 libgd-LDFLAGS = $libgd_ldflags"
66 fi
68 dnl Arguments to specify presence of other packages/features.
69 AC_ARG_WITH([fp],
70 AC_HELP_STRING([--with-fp],
71 [if using floating-point hardware @<:@default=yes@:>@]),
72 [with_fp=$withval],
73 [with_fp=yes])
74 AC_SUBST(with_fp)
75 AC_ARG_WITH([binutils],
76 AC_HELP_STRING([--with-binutils=PATH],
77 [specify location of binutils (as and ld)]),
78 [path_binutils=$withval],
79 [path_binutils=''])
80 AC_ARG_WITH([selinux],
81 AC_HELP_STRING([--with-selinux],
82 [if building with SELinux support]),
83 [with_selinux=$withval],
84 [with_selinux=auto])
86 AC_ARG_WITH([headers],
87 AC_HELP_STRING([--with-headers=PATH],
88 [location of system headers to use
89 (for example /usr/src/linux/include)
90 @<:@default=compiler default@:>@]),
91 [sysheaders=$withval],
92 [sysheaders=''])
94 AC_SUBST(use_default_link)
95 AC_ARG_WITH([default-link],
96 AC_HELP_STRING([--with-default-link],
97 [do not use explicit linker scripts]),
98 [use_default_link=$withval],
99 [use_default_link=default])
101 AC_ARG_ENABLE([sanity-checks],
102 AC_HELP_STRING([--disable-sanity-checks],
103 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
104 [enable_sanity=$enableval],
105 [enable_sanity=yes])
107 AC_SUBST(enable_check_abi)
108 AC_ARG_ENABLE([check-abi],
109 AC_HELP_STRING([--enable-check-abi],
110 [do "make check-abi" in "make check" (no/warn/yes)
111 @<:@default=no@:>@]),
112 [enable_check_abi=$enableval],
113 [enable_check_abi=no])
115 AC_ARG_ENABLE([shared],
116 AC_HELP_STRING([--enable-shared],
117 [build shared library @<:@default=yes if GNU ld@:>@]),
118 [shared=$enableval],
119 [shared=yes])
120 AC_ARG_ENABLE([profile],
121 AC_HELP_STRING([--enable-profile],
122 [build profiled library @<:@default=no@:>@]),
123 [profile=$enableval],
124 [profile=no])
125 AC_ARG_ENABLE([versioning],
126 AC_HELP_STRING([--disable-versioning],
127 [do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
128 [enable_versioning=$enableval],
129 [enable_versioning=yes])
131 AC_ARG_ENABLE([oldest-abi],
132 AC_HELP_STRING([--enable-oldest-abi=ABI],
133 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
134 [oldest_abi=$enableval],
135 [oldest_abi=no])
136 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
137 oldest_abi=default
138 else
139 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
140 fi
141 AC_SUBST(oldest_abi)
143 AC_ARG_ENABLE([stackguard-randomization],
144 AC_HELP_STRING([--enable-stackguard-randomization],
145 [initialize __stack_chk_guard canary with a random number at program start]),
146 [enable_stackguard_randomize=$enableval],
147 [enable_stackguard_randomize=no])
148 if test "$enable_stackguard_randomize" = yes; then
149 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
150 fi
152 dnl Generic infrastructure for drop-in additions to libc.
153 AC_ARG_ENABLE([add-ons],
154 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
155 [configure and build add-ons in DIR1,DIR2,...
156 search for add-ons if no parameter given]),
157 , [enable_add_ons=yes])
159 AC_ARG_ENABLE([hidden-plt],
160 AC_HELP_STRING([--disable-hidden-plt],
161 [do not hide internal function calls to avoid PLT]),
162 [hidden=$enableval],
163 [hidden=yes])
164 if test "x$hidden" = xno; then
165 AC_DEFINE(NO_HIDDEN)
166 fi
168 AC_ARG_ENABLE([bind-now],
169 AC_HELP_STRING([--enable-bind-now],
170 [disable lazy relocations in DSOs]),
171 [bindnow=$enableval],
172 [bindnow=no])
173 AC_SUBST(bindnow)
175 dnl On some platforms we cannot use dynamic loading. We must provide
176 dnl static NSS modules.
177 AC_ARG_ENABLE([static-nss],
178 AC_HELP_STRING([--enable-static-nss],
179 [build static NSS modules @<:@default=no@:>@]),
180 [static_nss=$enableval],
181 [static_nss=no])
182 dnl Enable static NSS also if we build no shared objects.
183 if test x"$static_nss" = xyes || test x"$shared" = xno; then
184 static_nss=yes
185 AC_DEFINE(DO_STATIC_NSS)
186 fi
188 AC_ARG_ENABLE([force-install],
189 AC_HELP_STRING([--disable-force-install],
190 [don't force installation of files from this package, even if they are older than the installed files]),
191 [force_install=$enableval],
192 [force_install=yes])
193 AC_SUBST(force_install)
195 dnl On some platforms we allow dropping compatibility with all kernel
196 dnl versions.
197 AC_ARG_ENABLE([kernel],
198 AC_HELP_STRING([--enable-kernel=VERSION],
199 [compile for compatibility with kernel not older than VERSION]),
200 [minimum_kernel=$enableval],
201 [])
202 dnl Prevent unreasonable values.
203 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
204 # Better nothing than this.
205 minimum_kernel=""
206 else
207 if test "$minimum_kernel" = current; then
208 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
209 fi
210 fi
212 dnl For the development we sometimes want gcc to issue even more warnings.
213 dnl This is not the default since many of the extra warnings are not
214 dnl appropriate.
215 AC_ARG_ENABLE([all-warnings],
216 AC_HELP_STRING([--enable-all-warnings],
217 [enable all useful warnings gcc can issue]),
218 [all_warnings=$enableval],
219 [])
220 AC_SUBST(all_warnings)
222 AC_ARG_ENABLE([multi-arch],
223 AC_HELP_STRING([--enable-multi-arch],
224 [enable single DSO with optimizations for multiple architectures]),
225 [multi_arch=$enableval],
226 [multi_arch=default])
228 AC_ARG_ENABLE([nss-crypt],
229 AC_HELP_STRING([--enable-nss-crypt],
230 [enable libcrypt to use nss]),
231 [nss_crypt=$enableval],
232 [nss_crypt=no])
233 if test x$nss_crypt = xyes; then
234 nss_includes=-I$(nss-config --includedir 2>/dev/null)
235 if test $? -ne 0; then
236 AC_MSG_ERROR([cannot find include directory with nss-config])
237 fi
238 old_CFLAGS="$CFLAGS"
239 CFLAGS="$CFLAGS $nss_includes"
240 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
241 #include <hasht.h>
242 #include <nsslowhash.h>
243 void f (void) { NSSLOW_Init (); }])],
244 libc_cv_nss_crypt=yes,
245 AC_MSG_ERROR([
246 cannot find NSS headers with lowlevel hash function interfaces]))
247 old_LIBS="$LIBS"
248 LIBS="$LIBS -lfreebl3"
249 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
250 #include <hasht.h>
251 #include <nsslowhash.h>],
252 [NSSLOW_Init();])],
253 libc_cv_nss_crypt=yes,
254 AC_MSG_ERROR([
255 cannot link program using lowlevel NSS hash functions]))
256 CFLAGS="$old_CFLAGS"
257 LIBS="$old_LIBS"
258 else
259 libc_cv_nss_crypt=no
260 fi
261 AC_SUBST(libc_cv_nss_crypt)
263 # The way shlib-versions is used to generate soversions.mk uses a
264 # fairly simplistic model for name recognition that can't distinguish
265 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
266 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
267 # tell. This doesn't get used much beyond that, so it's fairly safe.
268 case "$host_os" in
269 linux*)
270 ;;
271 gnu*)
272 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
273 ;;
274 esac
276 # We keep the original values in `$config_*' and never modify them, so we
277 # can write them unchanged into config.make. Everything else uses
278 # $machine, $vendor, and $os, and changes them whenever convenient.
279 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
281 # Don't allow vendor == "unknown"
282 test "$config_vendor" = unknown && config_vendor=
283 config_os="`echo $config_os | sed 's/^unknown-//'`"
285 # Some configurations imply other options.
286 elf=yes
288 # The configure fragment of an add-on port can modify these to supplement
289 # or override the table in the case statement below. No fragment should
290 # ever change the config_* variables, however.
291 machine=$config_machine
292 vendor=$config_vendor
293 os=$config_os
294 base_os=''
296 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
297 # Unify this here.
298 if test "$machine" = rs6000; then
299 machine="powerpc"
300 fi
302 # Braindead PowerPC box with absolutely no FPU.
303 case "$machine-$host_os" in
304 powerpc*-*soft)
305 with_fp=no
306 ;;
307 esac
309 submachine=
310 AC_ARG_WITH([cpu],
311 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
312 [dnl
313 case "$withval" in
314 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
315 no) ;;
316 *) submachine="$withval" ;;
317 esac
318 ])
320 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
321 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
323 # An add-on can set this when it wants to disable the sanity check below.
324 libc_config_ok=no
326 dnl Having this here, though empty, makes sure that if add-ons' fragments
327 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
328 dnl our AC_OUTPUT will actually use it.
329 AC_CONFIG_SUBDIRS()
331 case "$enable_add_ons" in
332 ''|no) add_ons= ;;
333 yes|'*')
334 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
335 sed 's@/[[^/]]*$@@' | sort | uniq`
336 add_ons_automatic=yes
337 ;;
338 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
339 add_ons_automatic=no ;;
340 esac
342 configured_add_ons=
343 add_ons_sfx=
344 add_ons_pfx=
345 if test x"$add_ons" != x; then
346 for f in $add_ons; do
347 # Some sanity checks
348 case "$f" in
349 crypt)
350 AC_MSG_ERROR([
351 *** It seems that you're using an old \`crypt' add-on. crypt is now
352 *** part of glibc and using the old add-on will not work with this
353 *** release. Start again with fresh sources and without the old
354 *** \`crypt' add-on.])
355 ;;
356 localedata)
357 AC_MSG_ERROR([
358 *** It seems that you're using an old \`localedata' add-on. localedata
359 *** is now part of glibc and using the old add-on will not work with
360 *** this release. Start again with fresh sources and without the old
361 *** \`localedata' add-on.])
362 ;;
363 esac
364 done
366 # Now source each add-on's configure fragment.
367 # The fragments can use $srcdir/$libc_add_on to find themselves,
368 # and test $add_ons_automatic to see if they were explicitly requested.
369 # A fragment can clear (or even change) $libc_add_on to affect
370 # whether it goes into the list to be actually used in the build.
371 use_add_ons=
372 for libc_add_on in $add_ons; do
373 # Test whether such a directory really exists.
374 # It can be absolute, or relative to $srcdir, or relative to the build dir.
375 case "$libc_add_on" in
376 /*)
377 libc_add_on_srcdir=$libc_add_on
378 ;;
379 *)
380 test -d "$srcdir/$libc_add_on" || {
381 if test -d "$libc_add_on"; then
382 libc_add_on="`pwd`/$libc_add_on"
383 else
384 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
385 fi
386 }
387 libc_add_on_srcdir=$srcdir/$libc_add_on
388 ;;
389 esac
391 libc_add_on_frag=$libc_add_on_srcdir/configure
392 libc_add_on_canonical=
393 libc_add_on_config_subdirs=
394 if test -r "$libc_add_on_frag"; then
395 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
396 libc_add_on_canonical=unknown
397 libc_add_on_subdirs=
398 . "$libc_add_on_frag"
399 test -z "$libc_add_on" || {
400 configured_add_ons="$configured_add_ons $libc_add_on"
401 if test "x$libc_add_on_canonical" = xunknown; then
402 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
403 fi
404 for d in $libc_add_on_subdirs; do
405 case "$libc_add_on" in
406 /*) subdir_srcdir="$libc_add_on" ;;
407 *) subdir_srcdir="\$(..)$libc_add_on" ;;
408 esac
409 case "$d" in
410 .)
411 d="${libc_add_on_canonical:-$libc_add_on}"
412 ;;
413 /*)
414 subdir_srcdir="$d"
415 ;;
416 *)
417 subdir_srcdir="$subdir_srcdir/$d"
418 ;;
419 esac
420 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
421 add_on_subdirs="$add_on_subdirs $d"
422 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
423 $d-srcdir = $subdir_srcdir"
424 done
425 for d in $libc_add_on_config_subdirs; do
426 case "$d" in
427 /*) AC_MSG_ERROR(dnl
428 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
429 esac
430 if test ! -d "$libc_add_on_srcdir/$d"; then
431 AC_MSG_ERROR(fragment wants to configure missing directory $d)
432 fi
433 case "$libc_add_on" in
434 /*) AC_MSG_ERROR(dnl
435 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
436 esac
437 subdirs="$subdirs $libc_add_on/$d"
438 done
439 }
440 fi
441 if test -n "$libc_add_on"; then
442 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
443 use_add_ons="$use_add_ons $libc_add_on"
444 add_ons_pfx="$add_ons_pfx $libc_add_on/"
445 test -z "$libc_add_on_canonical" ||
446 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
447 fi
448 done
449 # Use echo to strip excess whitespace.
450 add_ons="`echo $use_add_ons`"
451 fi
452 AC_SUBST(add_ons)
453 AC_SUBST(add_on_subdirs)
456 ###
457 ### I put this here to prevent those annoying emails from people who cannot
458 ### read and try to compile glibc on unsupported platforms. --drepper
459 ###
460 ### By using the undocumented --enable-hacker-mode option for configure
461 ### one can skip this test to make the configuration not fail for unsupported
462 ### platforms.
463 ###
464 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
465 case "$machine-$host_os" in
466 *-linux* | *-gnu* | arm*-none*)
467 ;;
468 *)
469 echo "*** The GNU C library is currently not available for this platform."
470 echo "*** So far nobody cared to port it and if there is no volunteer it"
471 echo "*** might never happen. So, if you have interest to see glibc on"
472 echo "*** this platform visit"
473 echo "*** http://www.gnu.org/software/libc/porting.html"
474 echo "*** and join the group of porters"
475 exit 1
476 ;;
477 esac
478 fi
480 dnl We need to use [ and ] for other purposes for a while now.
481 changequote(,)dnl
482 # Expand the configuration machine name into a subdirectory by architecture
483 # type and particular chip. If an add-on configure fragment already set
484 # base_machine, we don't change it.
485 test -n "$base_machine" || case "$machine" in
486 i[34567]86) base_machine=i386 machine=i386/$machine ;;
487 powerpc) base_machine=powerpc machine=powerpc/powerpc32 ;;
488 powerpc64) base_machine=powerpc machine=powerpc/powerpc64 ;;
489 s390) base_machine=s390 machine=s390/s390-32 ;;
490 s390x) base_machine=s390 machine=s390/s390-64 ;;
491 sh3*) base_machine=sh machine=sh/sh3 ;;
492 sh4*) base_machine=sh machine=sh/sh4 ;;
493 sparc | sparcv[67])
494 base_machine=sparc machine=sparc/sparc32 ;;
495 sparcv8 | supersparc | hypersparc)
496 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
497 sparcv8plus | sparcv8plusa | sparcv9)
498 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
499 sparcv8plusb | sparcv9b)
500 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
501 sparcv9v)
502 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
503 sparcv9v2)
504 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
505 sparc64)
506 base_machine=sparc machine=sparc/sparc64 ;;
507 sparc64b)
508 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
509 sparc64v)
510 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
511 sparc64v2)
512 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
513 *) base_machine=$machine ;;
514 esac
515 changequote([,])dnl
516 AC_SUBST(base_machine)
518 if test "$base_machine" = "i386"; then
519 AC_DEFINE(USE_REGPARMS)
520 fi
522 # For the multi-arch option we need support in the assembler.
523 AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support],
524 libc_cv_asm_gnu_indirect_function, [dnl
525 cat > conftest.s <<EOF
526 .type foo,%gnu_indirect_function
527 EOF
528 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD;
529 then
530 libc_cv_asm_gnu_indirect_function=yes
531 else
532 libc_cv_asm_gnu_indirect_function=no
533 fi
534 rm -f conftest*])
536 AC_MSG_CHECKING(whether .text pseudo-op must be used)
537 AC_CACHE_VAL(libc_cv_dot_text, [dnl
538 cat > conftest.s <<EOF
539 .text
540 EOF
541 libc_cv_dot_text=
542 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
543 libc_cv_dot_text=.text
544 fi
545 rm -f conftest*])
546 if test -z "$libc_cv_dot_text"; then
547 AC_MSG_RESULT(no)
548 else
549 AC_MSG_RESULT(yes)
550 fi
552 AC_CACHE_CHECK(for assembler global-symbol directive,
553 libc_cv_asm_global_directive, [dnl
554 libc_cv_asm_global_directive=UNKNOWN
555 for ac_globl in .globl .global .EXPORT; do
556 cat > conftest.s <<EOF
557 ${libc_cv_dot_text}
558 ${ac_globl} foo
559 foo:
560 EOF
561 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
562 libc_cv_asm_global_directive=${ac_globl}
563 fi
564 rm -f conftest*
565 test $libc_cv_asm_global_directive != UNKNOWN && break
566 done])
567 if test $libc_cv_asm_global_directive = UNKNOWN; then
568 AC_MSG_ERROR(cannot determine asm global directive)
569 else
570 AC_DEFINE_UNQUOTED(ASM_GLOBAL_DIRECTIVE, ${libc_cv_asm_global_directive})
571 fi
573 AC_CACHE_CHECK(for assembler .type directive prefix,
574 libc_cv_asm_type_prefix, [dnl
575 libc_cv_asm_type_prefix=no
576 for ac_try_prefix in '@' '%' '#'; do
577 cat > conftest.s <<EOF
578 ${libc_cv_dot_text}
579 ${libc_cv_asm_global_directive} foo
580 .type foo, ${ac_try_prefix}object
581 .size foo, 1
582 foo:
583 .byte 1
584 EOF
585 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
586 libc_cv_asm_type_prefix=${ac_try_prefix}
587 fi
588 rm -f conftest*
589 test "x$libc_cv_asm_type_prefix" != xno && break
590 done])
591 if test "x$libc_cv_asm_type_prefix" != xno; then
592 AC_DEFINE_UNQUOTED(ASM_TYPE_DIRECTIVE_PREFIX, ${libc_cv_asm_type_prefix})
593 fi
595 if test x"$libc_cv_asm_gnu_indirect_function" != xyes -o x"$libc_cv_asm_type_prefix" = xno; then
596 if test x"$multi_arch" = xyes; then
597 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
598 else
599 multi_arch=no
600 fi
601 fi
602 if test x"$multi_arch" != xno; then
603 multi_arch_d=/multiarch
604 fi
606 # Compute the list of sysdep directories for this configuration.
607 # This can take a while to compute.
608 sysdep_dir=$srcdir/sysdeps
609 AC_MSG_CHECKING(sysdep dirs)
610 dnl We need to use [ and ] for other purposes for a while now.
611 changequote(,)dnl
612 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
613 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
615 test "x$base_os" != x || case "$os" in
616 gnu*)
617 base_os=mach/hurd ;;
618 netbsd* | 386bsd* | freebsd* | bsdi*)
619 base_os=unix/bsd/bsd4.4 ;;
620 osf* | sunos* | ultrix* | newsos* | dynix* | *bsd*)
621 base_os=unix/bsd ;;
622 sysv* | isc* | esix* | sco* | minix* | irix4* | linux*)
623 base_os=unix/sysv ;;
624 irix6*)
625 base_os=unix/sysv/irix6/$os ;;
626 solaris[2-9]*)
627 base_os=unix/sysv/sysv4 ;;
628 none)
629 base_os=standalone ;;
630 esac
632 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
633 tail=$os
634 ostry=$os
635 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
636 ostry="$ostry /$o"
637 tail=$o
638 done
639 o=`echo $tail | sed 's/[0-9]*$//'`
640 if test $o != $tail; then
641 ostry="$ostry /$o"
642 fi
643 # For linux-gnu, try linux-gnu, then linux.
644 o=`echo $tail | sed 's/-.*$//'`
645 if test $o != $tail; then
646 ostry="$ostry /$o"
647 fi
649 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
650 base=
651 tail=$base_os
652 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
653 set $b
654 base="$base /$1"
655 tail="$2"
656 done
658 # For sparc/sparc32, try sparc/sparc32 and then sparc.
659 mach=
660 tail=$machine${submachine:+/$submachine}
661 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
662 set $m
663 # Prepend the machine's FPU directory unless --without-fp.
664 if test "$with_fp" = yes; then
665 mach="$mach /$1/fpu"
666 else
667 mach="$mach /$1/nofpu"
668 fi
669 mach="$mach /$1"
670 tail="$2"
671 done
673 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
674 changequote([,])dnl
676 # Find what sysdep directories exist.
677 sysnames_add_ons=
678 sysnames=
679 for b in $base ''; do
680 for m0 in $mach ''; do
681 for v in /$vendor ''; do
682 test "$v" = / && continue
683 for o in /$ostry ''; do
684 test "$o" = / && continue
685 for m in $multi_arch_d $mach ''; do
686 for d in $add_ons_pfx ''; do
687 for a in $add_ons_sfx ''; do
688 if test -n "$m0$m0sub$b$v$o$m$msub"; then
689 try_srcdir="${srcdir}/"
690 case "$d" in
691 /*) try_srcdir= ;;
692 esac
693 try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
694 test -n "$enable_debug_configure" &&
695 echo "$0 [DEBUG]: try $try" >&2
696 if test -d "$try_srcdir$try"; then
697 sysnames="$sysnames $try"
698 { test -n "$o" || test -n "$b"; } && os_used=t
699 { test -n "$m" || test -n "$m0"; } && machine_used=t
700 case x${m0:-$m} in
701 x*/$submachine) submachine_used=t ;;
702 esac
703 if test -n "$d"; then
704 case "$sysnames_add_ons" in
705 *" $d "*) ;;
706 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
707 esac
708 fi
709 fi
710 fi
711 done
712 done
713 done
714 done
715 done
716 done
717 done
719 # If the assembler supports gnu_indirect_function symbol type and the
720 # architecture supports multi-arch, we enable multi-arch by default.
721 case $sysnames_add_ons$sysnames in
722 *"$multi_arch_d"*)
723 ;;
724 *)
725 test x"$multi_arch" = xdefault && multi_arch=no
726 ;;
727 esac
728 if test x"$multi_arch" != xno; then
729 AC_DEFINE(USE_MULTIARCH)
730 fi
731 AC_SUBST(multi_arch)
733 if test -z "$os_used" && test "$os" != none; then
734 AC_MSG_ERROR(Operating system $os is not supported.)
735 fi
736 if test -z "$machine_used" && test "$machine" != none; then
737 AC_MSG_ERROR(The $machine is not supported.)
738 fi
739 if test -z "$submachine_used" && test -n "$submachine"; then
740 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
741 fi
742 AC_SUBST(submachine)
744 # We have now validated the configuration.
746 # Expand the list of system names into a full list of directories
747 # from each element's parent name and Implies file (if present).
748 set $sysnames
749 names=
750 while test $# -gt 0; do
751 name=$1
752 shift
754 case " $names " in *" $name "*)
755 # Already in the list.
756 continue
757 esac
759 # Report each name as we discover it, so there is no long pause in output.
760 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
762 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
764 case $name in
765 /*) xsrcdir= ;;
766 *) xsrcdir=$srcdir/ ;;
767 esac
768 test -n "$enable_debug_configure" &&
769 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
771 if test -f $xsrcdir$name/Implies; then
772 # Collect more names from the `Implies' file (removing comments).
773 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/Implies`"
774 implied=
775 for x in $implied_candidate; do
776 found=no
777 if test -d $xsrcdir$name_base/$x; then
778 implied="$implied $name_base/$x";
779 found=yes
780 fi
781 for d in $add_ons_pfx ''; do
782 try="${d}sysdeps/$x"
783 case $d in
784 /*) try_srcdir= ;;
785 *) try_srcdir=$srcdir/ ;;
786 esac
787 test -n "$enable_debug_configure" &&
788 echo "[DEBUG]: $name implied $x try($d) {$try_srcdir}$try" >&2
789 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
790 then
791 implied="$implied $try"
792 found=yes
793 case "$sysnames_add_ons" in
794 *" $d "*) ;;
795 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
796 esac
797 fi
798 done
799 if test $found = no; then
800 AC_MSG_WARN($name/Implies specifies nonexistent $x)
801 fi
802 done
803 else
804 implied=
805 fi
807 # Add NAME to the list of names.
808 names="$names $name"
810 # Find the parent of NAME, using the empty string if it has none.
811 changequote(,)dnl
812 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
813 changequote([,])dnl
815 # Add the names implied by NAME, and NAME's parent (if it has one), to
816 # the list of names to be processed (the argument list). We prepend the
817 # implied names to the list and append the parent. We want implied
818 # directories to come before further directories inferred from the
819 # configuration components; this ensures that for sysv4, unix/common
820 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
821 # after sysv4).
822 sysnames="`echo $implied $* $parent`"
823 test -n "$sysnames" && set $sysnames
824 done
826 # Add the default directories.
827 default_sysnames="sysdeps/generic"
828 sysnames="$names $default_sysnames"
829 AC_SUBST(sysnames)
830 # The other names were emitted during the scan.
831 AC_MSG_RESULT($default_sysnames)
833 # Collect the list of add-ons that supply partial sysdeps trees.
834 sysdeps_add_ons=
835 for add_on in $add_ons; do
836 case "$add_on" in
837 /*) xsrcdir= ;;
838 *) xsrcdir="$srcdir/" ;;
839 esac
841 test -d "$xsrcdir$add_on/sysdeps" || {
842 case "$configured_add_ons " in
843 *" $add_on "*) ;;
844 *|'')
845 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
846 ;;
847 esac
848 continue
849 }
851 sysdeps_add_ons="$sysdeps_add_ons $add_on"
852 case "$sysnames_add_ons" in
853 *" $add_on/ "*) ;;
854 *|'')
855 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
856 continue ;;
857 esac
859 found=no
860 for d in $sysnames; do
861 case "$d" in
862 $add_on/sysdeps/*) ;;
863 *) continue ;;
864 esac
865 (cd "$xsrcdir$d" && for f in *[[!~]]; do
866 case "$f" in
867 sys|bits)
868 for ff in $f/*.h; do
869 test -d "$ff" || { test -e "$ff" && exit 88; }
870 done
871 ;;
872 *)
873 test -d "$f" || { test -e "$f" && exit 88; }
874 ;;
875 esac
876 done)
877 if test $? -eq 88; then
878 found=yes
879 break
880 fi
881 done
882 if test $found = no; then
883 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
884 fi
885 done
886 AC_SUBST(sysdeps_add_ons)
889 ### Locate tools.
891 AC_PROG_INSTALL
892 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
893 # The makefiles need to use a different form to find it in $srcdir.
894 INSTALL='\$(..)./scripts/install-sh -c'
895 fi
896 AC_PROG_LN_S
898 LIBC_PROG_BINUTILS
899 AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
901 # Accept binutils 2.20 or newer.
902 AC_CHECK_PROG_VER(AS, $AS, --version,
903 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
904 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
905 AC_CHECK_PROG_VER(LD, $LD, --version,
906 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
907 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
909 # These programs are version sensitive.
910 AC_CHECK_TOOL_PREFIX
911 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
912 [version \([egcygnustpi-]*[0-9.]*\)], [4.[3-9].* | 4.[1-9][0-9].* | [5-9].* ],
913 critic_missing="$critic_missing gcc")
914 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
915 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
916 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
918 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
919 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
920 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
921 MSGFMT=: aux_missing="$aux_missing msgfmt")
922 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
923 [GNU texinfo.* \([0-9][0-9.]*\)],
924 [4.*],
925 MAKEINFO=: aux_missing="$aux_missing makeinfo")
926 AC_CHECK_PROG_VER(SED, sed, --version,
927 [GNU sed version \([0-9]*\.[0-9.]*\)],
928 [3.0[2-9]*|3.[1-9]*|[4-9]*],
929 SED=: aux_missing="$aux_missing sed")
931 AC_CHECK_TOOL(READELF, readelf, false)
933 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
934 case "x$AUTOCONF" in
935 xno|x|x:) AUTOCONF=no ;;
936 *)
937 AC_CACHE_CHECK(dnl
938 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
939 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
940 libc_cv_autoconf_works=yes
941 else
942 libc_cv_autoconf_works=no
943 fi])
944 test $libc_cv_autoconf_works = yes || AUTOCONF=no
945 ;;
946 esac
947 if test "x$AUTOCONF" = xno; then
948 aux_missing="$aux_missing autoconf"
949 fi
951 test -n "$critic_missing" && AC_MSG_ERROR([
952 *** These critical programs are missing or too old:$critic_missing
953 *** Check the INSTALL file for required versions.])
955 test -n "$aux_missing" && AC_MSG_WARN([
956 *** These auxiliary programs are missing or incompatible versions:$aux_missing
957 *** some features will be disabled.
958 *** Check the INSTALL file for required versions.])
960 # if using special system headers, find out the compiler's sekrit
961 # header directory and add that to the list. NOTE: Only does the right
962 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
963 if test -n "$sysheaders"; then
964 SYSINCLUDES=-nostdinc
965 for d in include include-fixed; do
966 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
967 SYSINCLUDES="$SYSINCLUDES -isystem $i"
968 done
969 SYSINCLUDES="$SYSINCLUDES \
970 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
971 if test -n "$CXX"; then
972 CXX_SYSINCLUDES=
973 cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
974 cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
975 for d in include "$cxxmachine/include"; do
976 i=../../../../$d/c++/$cxxversion
977 cxxheaders=`$CXX -print-file-name="$i"` &&
978 test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
979 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
980 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
981 done
982 fi
983 fi
984 AC_SUBST(SYSINCLUDES)
985 AC_SUBST(CXX_SYSINCLUDES)
987 # Test if LD_LIBRARY_PATH contains the notation for the current directory
988 # since this would lead to problems installing/building glibc.
989 # LD_LIBRARY_PATH contains the current directory if one of the following
990 # is true:
991 # - one of the terminals (":" and ";") is the first or last sign
992 # - two terminals occur directly after each other
993 # - the path contains an element with a dot in it
994 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
995 changequote(,)dnl
996 case ${LD_LIBRARY_PATH} in
997 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
998 ld_library_path_setting="contains current directory"
999 ;;
1000 *)
1001 ld_library_path_setting="ok"
1002 ;;
1003 esac
1004 changequote([,])dnl
1005 AC_MSG_RESULT($ld_library_path_setting)
1006 if test "$ld_library_path_setting" != "ok"; then
1007 AC_MSG_ERROR([
1008 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1009 *** building glibc. Please change the environment variable
1010 *** and run configure again.])
1011 fi
1013 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1014 if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
1015 libc_cv_gcc_static_libgcc=
1016 else
1017 libc_cv_gcc_static_libgcc=-static-libgcc
1018 fi])
1019 AC_SUBST(libc_cv_gcc_static_libgcc)
1021 AC_PATH_PROG(BASH_SHELL, bash, no)
1022 if test "$BASH_SHELL" != no &&
1023 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1024 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1025 libc_cv_have_bash2=yes
1026 else
1027 libc_cv_have_bash2=no
1028 fi
1029 AC_SUBST(libc_cv_have_bash2)
1031 dnl We need a ksh compatible shell for tzselect.
1032 if test "$BASH_SHELL" = no; then
1033 AC_PATH_PROG(KSH, ksh, no)
1034 if test "$KSH" = no; then
1035 libc_cv_have_ksh=no
1036 else
1037 libc_cv_have_ksh=yes
1038 fi
1039 else
1040 KSH="$BASH_SHELL"
1041 AC_SUBST(KSH)
1042 libc_cv_have_ksh=yes
1043 fi
1044 AC_SUBST(libc_cv_have_ksh)
1046 AC_PROG_AWK
1047 AC_PATH_PROG(PERL, perl, no)
1048 if test "$PERL" != no &&
1049 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1050 PERL=no
1051 fi
1052 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1053 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1054 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1056 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1057 AC_TRY_COMPILE(dnl
1058 [#define __need_size_t
1059 #define __need_wchar_t
1060 #include <stddef.h>
1061 #define __need_NULL
1062 #include <stddef.h>], [size_t size; wchar_t wchar;
1063 #ifdef offsetof
1064 #error stddef.h ignored __need_*
1065 #endif
1066 if (&size == NULL || &wchar == NULL) abort ();],
1067 libc_cv_friendly_stddef=yes,
1068 libc_cv_friendly_stddef=no)])
1069 if test $libc_cv_friendly_stddef = yes; then
1070 config_vars="$config_vars
1071 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1072 fi
1074 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1075 libc_cv_need_minus_P, [dnl
1076 cat > conftest.S <<EOF
1077 #include "confdefs.h"
1078 /* Nothing whatsoever. */
1079 EOF
1080 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1081 libc_cv_need_minus_P=no
1082 else
1083 libc_cv_need_minus_P=yes
1084 fi
1085 rm -f conftest*])
1086 if test $libc_cv_need_minus_P = yes; then
1087 config_vars="$config_vars
1088 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1089 fi
1091 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1092 cat > conftest.s <<EOF
1093 ${libc_cv_dot_text}
1094 foo:
1095 .set glibc_conftest_frobozz,foo
1096 $libc_cv_asm_global_directive glibc_conftest_frobozz
1097 EOF
1098 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1099 # (but it doesn't work), so we must do a linking check to be sure.
1100 cat > conftest1.c <<\EOF
1101 extern int glibc_conftest_frobozz;
1102 void _start() { glibc_conftest_frobozz = 1; }
1103 EOF
1104 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1105 -nostartfiles -nostdlib \
1106 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1107 libc_cv_asm_set_directive=yes
1108 else
1109 libc_cv_asm_set_directive=no
1110 fi
1111 rm -f conftest*])
1112 if test $libc_cv_asm_set_directive = yes; then
1113 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1114 fi
1116 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1117 libc_cv_asm_unique_object, [dnl
1118 cat > conftest.s <<EOF
1119 ${libc_cv_dot_text}
1120 _sym:
1121 .type _sym, ${libc_cv_asm_type_prefix}gnu_unique_object
1122 EOF
1123 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1124 libc_cv_asm_unique_object=yes
1125 else
1126 libc_cv_asm_unique_object=no
1127 fi
1128 rm -f conftest*])
1129 if test $libc_cv_asm_unique_object = yes; then
1130 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1131 fi
1133 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1134 [cat > conftest.s <<EOF
1135 ${libc_cv_dot_text}
1136 _sym:
1137 .symver _sym,sym@VERS
1138 EOF
1139 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1140 libc_cv_asm_symver_directive=yes
1141 else
1142 libc_cv_asm_symver_directive=no
1143 fi
1144 rm -f conftest*])
1145 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1146 if test $libc_cv_asm_symver_directive = yes; then
1147 cat > conftest.s <<EOF
1148 ${libc_cv_dot_text}
1149 _sym:
1150 .symver _sym,sym@VERS
1151 EOF
1152 cat > conftest.map <<EOF
1153 VERS_1 {
1154 global: sym;
1155 };
1157 VERS_2 {
1158 global: sym;
1159 } VERS_1;
1160 EOF
1161 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1162 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1163 -o conftest.so conftest.o
1164 -nostartfiles -nostdlib
1165 -Wl,--version-script,conftest.map
1166 1>&AS_MESSAGE_LOG_FD]);
1167 then
1168 libc_cv_ld_version_script_option=yes
1169 else
1170 libc_cv_ld_version_script_option=no
1171 fi
1172 else
1173 libc_cv_ld_version_script_option=no
1174 fi
1175 else
1176 libc_cv_ld_version_script_option=no
1177 fi
1178 rm -f conftest*])
1179 if test $shared != no &&
1180 test $libc_cv_asm_symver_directive = yes &&
1181 test $libc_cv_ld_version_script_option = yes &&
1182 test $enable_versioning = yes; then
1183 VERSIONING=yes
1184 AC_DEFINE(DO_VERSIONING)
1185 else
1186 VERSIONING=no
1187 fi
1188 AC_SUBST(VERSIONING)
1190 if test $shared != no && test $VERSIONING = no; then
1191 echo "\
1192 *** WARNING: You should not compile GNU libc without versioning. Not using
1193 *** versioning will introduce incompatibilities so that old binaries
1194 *** will not run anymore.
1195 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1196 fi
1197 AC_CACHE_CHECK(for .previous assembler directive,
1198 libc_cv_asm_previous_directive, [dnl
1199 cat > conftest.s <<EOF
1200 .section foo_section
1201 .previous
1202 EOF
1203 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1204 libc_cv_asm_previous_directive=yes
1205 else
1206 libc_cv_asm_previous_directive=no
1207 fi
1208 rm -f conftest*])
1209 if test $libc_cv_asm_previous_directive = yes; then
1210 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1211 else
1212 AC_CACHE_CHECK(for .popsection assembler directive,
1213 libc_cv_asm_popsection_directive, [dnl
1214 cat > conftest.s <<EOF
1215 .pushsection foo_section
1216 .popsection
1217 EOF
1218 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1219 libc_cv_asm_popsection_directive=yes
1220 else
1221 libc_cv_asm_popsection_directive=no
1222 fi
1223 rm -f conftest*])
1224 if test $libc_cv_asm_popsection_directive = yes; then
1225 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1226 fi
1227 fi
1228 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1229 libc_cv_asm_protected_directive, [dnl
1230 cat > conftest.s <<EOF
1231 .protected foo
1232 foo:
1233 .hidden bar
1234 bar:
1235 EOF
1236 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1237 libc_cv_asm_protected_directive=yes
1238 else
1239 AC_MSG_ERROR(assembler support for symbol visibility is required)
1240 fi
1241 rm -f conftest*])
1243 if test $libc_cv_asm_protected_directive = yes; then
1244 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1245 libc_cv_visibility_attribute,
1246 [cat > conftest.c <<EOF
1247 int foo __attribute__ ((visibility ("hidden"))) = 1;
1248 int bar __attribute__ ((visibility ("protected"))) = 1;
1249 EOF
1250 libc_cv_visibility_attribute=no
1251 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1252 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1253 if grep '\.protected.*bar' conftest.s >/dev/null; then
1254 libc_cv_visibility_attribute=yes
1255 fi
1256 fi
1257 fi
1258 rm -f conftest.{c,s}
1259 ])
1260 if test $libc_cv_visibility_attribute != yes; then
1261 AC_MSG_ERROR(compiler support for visibility attribute is required)
1262 fi
1263 fi
1265 if test $libc_cv_visibility_attribute = yes; then
1266 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1267 libc_cv_broken_visibility_attribute,
1268 [cat > conftest.c <<EOF
1269 int foo (int x);
1270 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1271 int bar (int x) { return x; }
1272 EOF
1273 libc_cv_broken_visibility_attribute=yes
1274 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1275 changequote(,)dnl
1276 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1277 changequote([,])dnl
1278 libc_cv_broken_visibility_attribute=no
1279 fi
1280 fi
1281 rm -f conftest.c conftest.s
1282 ])
1283 if test $libc_cv_broken_visibility_attribute = yes; then
1284 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1285 fi
1286 fi
1288 AC_CACHE_CHECK(for broken __attribute__((alias())),
1289 libc_cv_broken_alias_attribute,
1290 [cat > conftest.c <<EOF
1291 extern int foo (int x) __asm ("xyzzy");
1292 int bar (int x) { return x; }
1293 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1294 extern int dfoo;
1295 extern __typeof (dfoo) dfoo __asm ("abccb");
1296 int dfoo = 1;
1297 EOF
1298 libc_cv_broken_alias_attribute=yes
1299 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1300 if grep 'xyzzy' conftest.s >/dev/null &&
1301 grep 'abccb' conftest.s >/dev/null; then
1302 libc_cv_broken_alias_attribute=no
1303 fi
1304 fi
1305 rm -f conftest.c conftest.s
1306 ])
1307 if test $libc_cv_broken_alias_attribute = yes; then
1308 AC_MSG_ERROR(working alias attribute support required)
1309 fi
1311 if test $libc_cv_visibility_attribute = yes; then
1312 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1313 libc_cv_have_sdata_section,
1314 [echo "int i;" > conftest.c
1315 libc_cv_have_sdata_section=no
1316 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1317 | grep '\.sdata' >/dev/null; then
1318 libc_cv_have_sdata_section=yes
1319 fi
1320 rm -f conftest.c conftest.so
1321 ])
1322 if test $libc_cv_have_sdata_section = yes; then
1323 AC_DEFINE(HAVE_SDATA_SECTION)
1324 fi
1325 fi
1327 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1328 libc_cv_initfini_array, [dnl
1329 LIBC_TRY_LINK_STATIC([
1330 int foo (void) { return 1; }
1331 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1332 ],
1333 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1334 libc_cv_initfini_array=yes
1335 else
1336 libc_cv_initfini_array=no
1337 fi],
1338 [libc_cv_initfini_array=no])
1339 ])
1340 if test $libc_cv_initfini_array != yes; then
1341 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1342 fi
1344 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1345 libc_cv_ctors_header, [dnl
1346 libc_cv_ctors_header=yes
1347 LIBC_TRY_LINK_STATIC([
1348 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1349 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1350 ],
1351 [dnl
1352 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1353 { gsub(/\@<:@ */, "@<:@") }
1354 $2 == ".ctors" || $2 == ".dtors" {
1355 size = strtonum("0x" $6)
1356 align = strtonum("0x" $NF)
1357 seen@<:@$2@:>@ = 1
1358 stub@<:@$2@:>@ = size == align * 2
1359 }
1360 END {
1361 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1362 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1363 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1364 }
1365 '], [libc_cv_ctors_header=no])
1366 ], [dnl
1367 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1368 ])
1369 ])
1370 if test $libc_cv_ctors_header = no; then
1371 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1372 fi
1374 AC_CACHE_CHECK(for libunwind-support in compiler,
1375 libc_cv_cc_with_libunwind, [
1376 cat > conftest.c <<EOF
1377 int main (void) { return 0; }
1378 EOF
1379 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1380 conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
1381 libc_cv_cc_with_libunwind=yes
1382 else
1383 libc_cv_cc_with_libunwind=no
1384 fi
1385 rm -f conftest*])
1386 AC_SUBST(libc_cv_cc_with_libunwind)
1387 if test $libc_cv_cc_with_libunwind = yes; then
1388 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1389 fi
1391 AC_CACHE_CHECK(for -z nodelete option,
1392 libc_cv_z_nodelete, [dnl
1393 cat > conftest.c <<EOF
1394 int _start (void) { return 42; }
1395 EOF
1396 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1397 -fPIC -shared -o conftest.so conftest.c
1398 -nostartfiles -nostdlib
1399 -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1400 then
1401 libc_cv_z_nodelete=yes
1402 else
1403 AC_MSG_ERROR(linker with -z nodelete support required)
1404 fi
1405 rm -f conftest*])
1407 AC_CACHE_CHECK(for -z nodlopen option,
1408 libc_cv_z_nodlopen, [dnl
1409 cat > conftest.c <<EOF
1410 int _start (void) { return 42; }
1411 EOF
1412 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1413 -fPIC -shared -o conftest.so conftest.c
1414 -nostartfiles -nostdlib
1415 -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1416 then
1417 libc_cv_z_nodlopen=yes
1418 else
1419 AC_MSG_ERROR(linker with -z nodlopen support required)
1420 fi
1421 rm -f conftest*])
1423 AC_CACHE_CHECK(for -z initfirst option,
1424 libc_cv_z_initfirst, [dnl
1425 cat > conftest.c <<EOF
1426 int _start (void) { return 42; }
1427 EOF
1428 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1429 -fPIC -shared -o conftest.so conftest.c
1430 -nostartfiles -nostdlib
1431 -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1432 then
1433 libc_cv_z_initfirst=yes
1434 else
1435 AC_MSG_ERROR(linker with -z initfirst support required)
1436 fi
1437 rm -f conftest*])
1439 # Add-on fragments can set these for other machines.
1440 libc_commonpagesize=${libc_commonpagesize:-no}
1441 libc_relro_required=${libc_relro_required:-no}
1442 case "$base_machine" in
1443 i[[34567]]86 | x86_64 | powerpc* | s390*)
1444 libc_commonpagesize=0x1000
1445 libc_relro_required=yes
1446 ;;
1447 sparc*)
1448 libc_commonpagesize=0x2000
1449 libc_relro_required=yes
1450 ;;
1451 esac
1453 if test $libc_commonpagesize != no; then
1454 AC_CACHE_CHECK(for -z relro option,
1455 libc_cv_z_relro, [dnl
1456 libc_cv_z_relro=no
1457 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1458 int _start (void) { return 42; }
1459 extern void _exit (int);
1460 /* Since these pointers are const, they should go in rodata.
1461 Since they refer to functions that have to be resolved by
1462 dynamic linking, they should instead go in RELRO data. */
1463 const void *const relro[] = { &_start, &_exit, 0 };
1464 /* GNU ld fails to produce RELRO data when it's very small and there is no
1465 normal writable data following it, or if only uninitialized (.bss) data
1466 follows it, or only very small writable data. */
1467 int data[0x10000] = { 1, };
1468 ]])])
1469 cat > conftest.awk <<\EOF
1470 BEGIN {
1471 result = "no"
1472 commonpagesize = strtonum(commonpagesize)
1473 }
1474 { print "LINE:", $0 > "/dev/stderr" }
1475 $1 == "GNU_RELRO" {
1476 vaddr = strtonum($3)
1477 memsz = strtonum($6)
1478 end = vaddr + memsz
1479 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1480 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1481 result = (end % commonpagesize == 0) ? "yes" : "broken"
1482 }
1483 END { print result }
1484 EOF
1485 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1486 -fPIC -shared -o conftest.so conftest.c
1487 -nostartfiles -nostdlib
1488 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1489 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1490 AC_TRY_COMMAND([
1491 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1492 conftest.ph > conftest.cps
1493 ]) &&
1494 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1495 rm -f conftest*])
1496 if { test "x$libc_relro_required" = xyes &&
1497 test "x$libc_cv_z_relro" != xyes
1498 }
1499 then
1500 AC_MSG_ERROR(linker with -z relro support required)
1501 fi
1502 else
1503 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1504 fi
1506 AC_CACHE_CHECK(for -Bgroup option,
1507 libc_cv_Bgroup, [dnl
1508 cat > conftest.c <<EOF
1509 int _start (void) { return 42; }
1510 EOF
1511 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1512 -fPIC -shared -o conftest.so conftest.c
1513 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1514 then
1515 libc_cv_Bgroup=yes
1516 else
1517 libc_cv_Bgroup=no
1518 fi
1519 rm -f conftest*])
1520 AC_SUBST(libc_cv_Bgroup)
1522 AC_CACHE_CHECK(for libgcc_s suffix,
1523 libc_cv_libgcc_s_suffix, [dnl
1524 cat > conftest.c <<EOF
1525 int main (void) { return 0; }
1526 EOF
1527 changequote(,)dnl
1528 libc_cv_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1529 -fPIC -shared -shared-libgcc -o conftest.so \
1530 conftest.c -v 2>&1 >/dev/null \
1531 | sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
1532 changequote([,])dnl
1533 rm -f conftest*])
1534 AC_SUBST(libc_cv_libgcc_s_suffix)
1536 AC_CACHE_CHECK(for --as-needed option,
1537 libc_cv_as_needed, [dnl
1538 cat > conftest.c <<EOF
1539 int main (void) { return 0; }
1540 EOF
1541 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1542 -fPIC -shared -o conftest.so conftest.c
1543 -lgcc_s$libc_cv_libgcc_s_suffix -Wl,--as-needed
1544 -nostdlib 1>&AS_MESSAGE_LOG_FD])
1545 then
1546 libc_cv_as_needed=yes
1547 else
1548 libc_cv_as_needed=no
1549 fi
1550 rm -f conftest*])
1551 AC_SUBST(libc_cv_as_needed)
1553 ASFLAGS_config=
1554 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1555 libc_cv_as_noexecstack, [dnl
1556 cat > conftest.c <<EOF
1557 void foo (void) { }
1558 EOF
1559 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1560 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1561 && grep -q .note.GNU-stack conftest.s \
1562 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1563 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1564 then
1565 libc_cv_as_noexecstack=yes
1566 else
1567 libc_cv_as_noexecstack=no
1568 fi
1569 rm -f conftest*])
1570 if test $libc_cv_as_noexecstack = yes; then
1571 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1572 fi
1573 AC_SUBST(ASFLAGS_config)
1575 AC_CACHE_CHECK(for -z combreloc,
1576 libc_cv_z_combreloc, [dnl
1577 cat > conftest.c <<EOF
1578 extern int bar (int);
1579 extern int mumble;
1580 int foo (void) { return bar (mumble); }
1581 EOF
1582 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1583 -fPIC -shared -o conftest.so conftest.c
1584 -nostdlib -nostartfiles
1585 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1586 then
1587 dnl The following test is a bit weak. We must use a tool which can test
1588 dnl cross-platform since the gcc used can be a cross compiler. Without
1589 dnl introducing new options this is not easily doable. Instead use a tool
1590 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1591 dnl look for a section named .rel.dyn.
1592 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1593 libc_cv_z_combreloc=yes
1594 else
1595 libc_cv_z_combreloc=no
1596 fi
1597 else
1598 libc_cv_z_combreloc=no
1599 fi
1600 rm -f conftest*])
1601 if test "$libc_cv_z_combreloc" = yes; then
1602 AC_DEFINE(HAVE_Z_COMBRELOC)
1603 fi
1604 AC_SUBST(libc_cv_z_combreloc)
1606 AC_CACHE_CHECK(for -z execstack,
1607 libc_cv_z_execstack, [dnl
1608 cat > conftest.c <<EOF
1609 int _start (void) { return 42; }
1610 EOF
1611 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1612 -fPIC -shared -o conftest.so conftest.c
1613 -Wl,-z,execstack -nostdlib
1614 1>&AS_MESSAGE_LOG_FD])
1615 then
1616 libc_cv_z_execstack=yes
1617 else
1618 libc_cv_z_execstack=no
1619 fi
1620 rm -f conftest*])
1621 AC_SUBST(libc_cv_z_execstack)
1623 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1624 cat > conftest.c <<EOF
1625 int foo;
1626 main () { return 0;}
1627 EOF
1628 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -fpie
1629 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD])
1630 then
1631 libc_cv_fpie=yes
1632 else
1633 libc_cv_fpie=no
1634 fi
1635 rm -f conftest*])
1637 AC_SUBST(libc_cv_fpie)
1639 AC_CACHE_CHECK(for --hash-style option,
1640 libc_cv_hashstyle, [dnl
1641 cat > conftest.c <<EOF
1642 int _start (void) { return 42; }
1643 EOF
1644 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1645 -fPIC -shared -o conftest.so conftest.c
1646 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1647 then
1648 libc_cv_hashstyle=yes
1649 else
1650 libc_cv_hashstyle=no
1651 fi
1652 rm -f conftest*])
1653 AC_SUBST(libc_cv_hashstyle)
1655 # The linker's default -shared behavior is good enough if it
1656 # does these things that our custom linker scripts ensure that
1657 # all allocated NOTE sections come first.
1658 if test "$use_default_link" = default; then
1659 AC_CACHE_CHECK([for sufficient default -shared layout],
1660 libc_cv_use_default_link, [dnl
1661 libc_cv_use_default_link=no
1662 cat > conftest.s <<\EOF
1663 .section .note.a,"a",%note
1664 .balign 4
1665 .long 4,4,9
1666 .string "GNU"
1667 .string "foo"
1668 .section .note.b,"a",%note
1669 .balign 4
1670 .long 4,4,9
1671 .string "GNU"
1672 .string "bar"
1673 EOF
1674 if AC_TRY_COMMAND([dnl
1675 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1676 ac_try=`$READELF -S conftest.so | sed -n \
1677 ['${x;p;}
1678 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1679 t a
1680 b
1681 : a
1682 H']`
1683 then
1684 libc_seen_a=no libc_seen_b=no
1685 set -- $ac_try
1686 while test $# -ge 2 -a "$1" = NOTE; do
1687 case "$2" in
1688 .note.a) libc_seen_a=yes ;;
1689 .note.b) libc_seen_b=yes ;;
1690 esac
1691 shift 2
1692 done
1693 case "$libc_seen_a$libc_seen_b" in
1694 yesyes)
1695 libc_cv_use_default_link=yes
1696 ;;
1697 *)
1698 echo >&AS_MESSAGE_LOG_FD "\
1699 $libc_seen_a$libc_seen_b from:
1700 $ac_try"
1701 ;;
1702 esac
1703 fi
1704 rm -f conftest*])
1705 use_default_link=$libc_cv_use_default_link
1706 fi
1708 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1709 if libc_cv_output_format=`
1710 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1711 then
1712 :
1713 else
1714 libc_cv_output_format=
1715 fi
1716 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1717 AC_SUBST(libc_cv_output_format)
1719 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1720 cat > conftest.c <<EOF
1721 int foo;
1722 EOF
1723 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1724 conftest.c 1>&AS_MESSAGE_LOG_FD])
1725 then
1726 libc_cv_fno_toplevel_reorder=yes
1727 else
1728 libc_cv_fno_toplevel_reorder=no
1729 fi
1730 rm -f conftest*])
1731 if test $libc_cv_fno_toplevel_reorder = yes; then
1732 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1733 else
1734 fno_unit_at_a_time=-fno-unit-at-a-time
1735 fi
1736 AC_SUBST(fno_unit_at_a_time)
1738 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1739 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1740 [libc_cv_ssp=yes],
1741 [libc_cv_ssp=no])
1742 ])
1743 AC_SUBST(libc_cv_ssp)
1745 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1746 cat > conftest.c <<EOF
1747 int foo;
1748 #ifdef __GNUC_GNU_INLINE__
1749 main () { return 0;}
1750 #else
1751 #error
1752 #endif
1753 EOF
1754 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1755 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1756 then
1757 libc_cv_gnu89_inline=yes
1758 else
1759 libc_cv_gnu89_inline=no
1760 fi
1761 rm -f conftest*])
1762 if test $libc_cv_gnu89_inline = yes; then
1763 gnu89_inline=-fgnu89-inline
1764 else
1765 gnu89_inline=
1766 fi
1767 AC_SUBST(gnu89_inline)
1769 AC_CACHE_CHECK(whether cc puts quotes around section names,
1770 libc_cv_have_section_quotes,
1771 [cat > conftest.c <<EOF
1772 static const int foo
1773 __attribute__ ((section ("bar"))) = 1;
1774 EOF
1775 if ${CC-cc} -S conftest.c -o conftest.s; then
1776 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1777 libc_cv_have_section_quotes=yes
1778 else
1779 libc_cv_have_section_quotes=no
1780 fi
1781 else
1782 libc_cv_have_section_quotes=unknown
1783 fi
1784 rm -f conftest.{c,s}
1785 ])
1786 if test $libc_cv_have_section_quotes = yes; then
1787 AC_DEFINE(HAVE_SECTION_QUOTES)
1788 fi
1790 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1791 [dnl
1792 cat > conftest.s <<EOF
1793 ${libc_cv_dot_text}
1794 ${libc_cv_asm_global_directive} foo
1795 foo:
1796 .weak foo
1797 .weak bar; bar = foo
1798 EOF
1799 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1800 libc_cv_asm_weak_directive=yes
1801 else
1802 libc_cv_asm_weak_directive=no
1803 fi
1804 rm -f conftest*])
1806 if test $libc_cv_asm_weak_directive = no; then
1807 AC_CACHE_CHECK(for assembler .weakext directive,
1808 libc_cv_asm_weakext_directive,
1809 [dnl
1810 cat > conftest.s <<EOF
1811 ${libc_cv_dot_text}
1812 ${libc_cv_asm_global_directive} foo
1813 foo:
1814 .weakext bar foo
1815 .weakext baz
1816 ${libc_cv_asm_global_directive} baz
1817 baz:
1818 EOF
1819 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1820 libc_cv_asm_weakext_directive=yes
1821 else
1822 libc_cv_asm_weakext_directive=no
1823 fi
1824 rm -f conftest*])
1826 fi # no .weak
1828 if test $libc_cv_asm_weak_directive = yes; then
1829 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1830 elif test $libc_cv_asm_weakext_directive = yes; then
1831 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1832 fi
1834 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1835 case $machine in
1836 sparc/sparc64*) cfi_offset=2047;;
1837 *) cfi_offset=0;;
1838 esac
1839 cat > conftest.s <<EOF
1840 .text
1841 .type func,%function
1842 func:
1843 .cfi_startproc
1844 .cfi_remember_state
1845 .cfi_rel_offset 1, $cfi_offset
1846 .cfi_endproc
1847 EOF
1848 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1849 libc_cv_asm_cfi_directives=yes
1850 else
1851 libc_cv_asm_cfi_directives=no
1852 fi
1853 rm -f conftest*])
1854 if test $libc_cv_asm_cfi_directives = yes; then
1855 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1856 fi
1858 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1859 cat > conftest.c <<\EOF
1860 _start () {}
1861 int __eh_pc;
1862 __throw () {}
1863 EOF
1864 dnl No \ in command here because it ends up inside ''.
1865 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1866 -nostdlib -nostartfiles -Wl,--no-whole-archive
1867 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1868 libc_cv_ld_no_whole_archive=yes
1869 else
1870 libc_cv_ld_no_whole_archive=no
1871 fi
1872 rm -f conftest*])
1873 if test $libc_cv_ld_no_whole_archive = no; then
1874 AC_MSG_ERROR([support for --no-whole-archive is needed])
1875 fi
1877 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1878 cat > conftest.c <<\EOF
1879 _start () {}
1880 int __eh_pc;
1881 __throw () {}
1882 EOF
1883 dnl No \ in command here because it ends up inside ''.
1884 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1885 -nostdlib -nostartfiles -fexceptions
1886 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1887 libc_cv_gcc_exceptions=yes
1888 else
1889 libc_cv_gcc_exceptions=no
1890 fi
1891 rm -f conftest*])
1892 if test $libc_cv_gcc_exceptions = yes; then
1893 exceptions=-fexceptions
1894 fi
1895 AC_SUBST(exceptions)dnl
1897 if test "$host_cpu" = powerpc ; then
1898 # Check for a bug present in at least versions 2.8.x of GCC
1899 # and versions 1.0.x of EGCS.
1900 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1901 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1902 libc_cv_c_asmcr0_bug='no',
1903 libc_cv_c_asmcr0_bug='yes')])
1904 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1905 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1906 fi
1907 fi
1909 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1910 cat > conftest.c <<\EOF
1911 void zero (void *x)
1912 {
1913 __builtin_memset (x, 0, 1000);
1914 }
1915 EOF
1916 dnl
1917 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1918 then
1919 libc_cv_gcc_builtin_memset=no
1920 else
1921 libc_cv_gcc_builtin_memset=yes
1922 fi
1923 rm -f conftest* ])
1924 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1925 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1926 fi
1928 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1929 cat > conftest.c <<\EOF
1930 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1931 char *foo (const char *a, const char *b)
1932 {
1933 return __builtin_strstr (a, b);
1934 }
1935 EOF
1936 dnl
1937 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1938 then
1939 libc_cv_gcc_builtin_redirection=yes
1940 else
1941 libc_cv_gcc_builtin_redirection=no
1942 fi
1943 rm -f conftest* ])
1944 if test "$libc_cv_gcc_builtin_redirection" = no; then
1945 AC_MSG_ERROR([support for the symbol redirection needed])
1946 fi
1948 dnl Check whether the compiler supports the __thread keyword.
1949 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1950 [cat > conftest.c <<\EOF
1951 __thread int a = 42;
1952 EOF
1953 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1954 libc_cv_gcc___thread=yes
1955 else
1956 libc_cv_gcc___thread=no
1957 fi
1958 rm -f conftest*])
1959 if test "$libc_cv_gcc___thread" = no; then
1960 AC_MSG_ERROR([support for the __thread keyword is required])
1961 fi
1963 dnl Check whether the compiler supports the tls_model attribute.
1964 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1965 cat > conftest.c <<\EOF
1966 extern __thread int a __attribute__((tls_model ("initial-exec")));
1967 EOF
1968 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1969 libc_cv_gcc_tls_model_attr=yes
1970 else
1971 libc_cv_gcc_tls_model_attr=no
1972 fi
1973 rm -f conftest*])
1974 if test "$libc_cv_gcc_tls_model_attr" = no; then
1975 AC_MSG_ERROR([support for the tls_model attribute is required])
1976 fi
1978 dnl Determine how to disable generation of FMA instructions.
1979 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1980 libc_cv_cc_nofma, [dnl
1981 libc_cv_cc_nofma=
1982 for opt in -ffp-contract=off -mno-fused-madd; do
1983 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1984 done])
1986 if test -n "$submachine"; then
1987 AC_CACHE_CHECK([for compiler option for CPU variant],
1988 libc_cv_cc_submachine, [dnl
1989 libc_cv_cc_submachine=no
1990 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1991 LIBC_TRY_CC_OPTION([$opt], [
1992 libc_cv_cc_submachine="$opt"
1993 break], [])
1994 done])
1995 if test "x$libc_cv_cc_submachine" = xno; then
1996 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1997 fi
1998 fi
1999 AC_SUBST(libc_cv_cc_submachine)
2001 dnl Check whether we have the gd library available.
2002 AC_MSG_CHECKING(for libgd)
2003 if test "$with_gd" != "no"; then
2004 old_CFLAGS="$CFLAGS"
2005 CFLAGS="$CFLAGS $libgd_include"
2006 old_LDFLAGS="$LDFLAGS"
2007 LDFLAGS="$LDFLAGS $libgd_ldflags"
2008 old_LIBS="$LIBS"
2009 LIBS="$LIBS -lgd -lpng -lz -lm"
2010 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
2011 CFLAGS="$old_CFLAGS"
2012 LDFLAGS="$old_LDFLAGS"
2013 LIBS="$old_LIBS"
2014 else
2015 LIBGD=no
2016 fi
2017 AC_MSG_RESULT($LIBGD)
2018 AC_SUBST(LIBGD)
2020 # SELinux detection
2021 if test x$with_selinux = xno ; then
2022 have_selinux=no;
2023 else
2024 # See if we have the SELinux library
2025 AC_CHECK_LIB(selinux, is_selinux_enabled,
2026 have_selinux=yes, have_selinux=no)
2027 # See if we have the SELinux header with the NSCD permissions in it.
2028 if test x$have_selinux = xyes ; then
2029 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
2030 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
2031 [#ifdef NSCD__SHMEMHOST
2032 return 0;
2033 #else
2034 #error NSCD__SHMEMHOST not defined
2035 #endif],
2036 have_selinux=yes, have_selinux=no)
2037 AC_MSG_RESULT($have_selinux)
2038 fi
2040 if test x$with_selinux = xyes ; then
2041 if test x$have_selinux = xno ; then
2042 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
2043 fi
2044 fi
2045 fi
2046 # Check if we're building with SELinux support.
2047 if test "x$have_selinux" = xyes; then
2048 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
2050 # See if we have the libaudit library
2051 AC_CHECK_LIB(audit, audit_log_user_avc_message,
2052 have_libaudit=yes, have_libaudit=no)
2053 if test "x$have_libaudit" = xyes; then
2054 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2055 fi
2056 AC_SUBST(have_libaudit)
2058 # See if we have the libcap library
2059 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2060 if test "x$have_libcap" = xyes; then
2061 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2062 fi
2063 AC_SUBST(have_libcap)
2064 fi
2065 AC_SUBST(have_selinux)
2067 dnl check for the size of 'long double'.
2068 AC_CHECK_SIZEOF(long double, 0)
2069 sizeof_long_double=$ac_cv_sizeof_long_double
2070 AC_SUBST(sizeof_long_double)
2072 ### End of automated tests.
2073 ### Now run sysdeps configure fragments.
2075 # They also can set these variables.
2076 use_ldconfig=no
2077 ldd_rewrite_script=no
2078 libc_cv_sysconfdir=$sysconfdir
2079 libc_cv_gcc_unwind_find_fde=no
2080 libc_cv_idn=no
2082 # Iterate over all the sysdep directories we will use, running their
2083 # configure fragments.
2084 for dir in $sysnames; do
2085 case $dir in
2086 /*) dest=$dir ;;
2087 *) dest=$srcdir/$dir ;;
2088 esac
2089 if test -r $dest/configure; then
2090 AC_MSG_RESULT(running configure fragment for $dir)
2091 . $dest/configure
2092 fi
2093 done
2095 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2096 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2097 fi
2098 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2100 # Test for old glibc 2.0.x headers so that they can be removed properly
2101 # Search only in includedir.
2102 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2103 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2104 then
2105 old_glibc_headers=yes
2106 else
2107 old_glibc_headers=no
2108 fi
2109 AC_MSG_RESULT($old_glibc_headers)
2110 if test ${old_glibc_headers} = yes; then
2111 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2112 AC_MSG_WARN(*** be removed.)
2113 fi
2114 AC_SUBST(old_glibc_headers)
2116 AC_SUBST(libc_cv_slibdir)
2117 AC_SUBST(libc_cv_localedir)
2118 AC_SUBST(libc_cv_sysconfdir)
2119 AC_SUBST(libc_cv_rootsbindir)
2120 AC_SUBST(libc_cv_forced_unwind)
2122 dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
2123 AC_SUBST(libc_cv_cpp_asm_debuginfo)
2124 AC_SUBST(libc_cv_cc_sse4)
2125 AC_SUBST(libc_cv_cc_avx)
2126 AC_SUBST(libc_cv_cc_sse2avx)
2127 AC_SUBST(libc_cv_cc_novzeroupper)
2128 AC_SUBST(libc_cv_cc_fma4)
2129 AC_SUBST(libc_cv_cc_nofma)
2130 AC_SUBST(libc_cv_as_i686)
2131 AC_SUBST(libc_cv_sparc_as_vis3)
2133 AC_SUBST(use_ldconfig)
2134 AC_SUBST(ldd_rewrite_script)
2136 AC_SUBST(static)
2137 AC_SUBST(shared)
2139 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2140 [libc_cv_pic_default=yes
2141 cat > conftest.c <<EOF
2142 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2143 # error PIC is default.
2144 #endif
2145 EOF
2146 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2147 libc_cv_pic_default=no
2148 fi
2149 rm -f conftest.*])
2150 AC_SUBST(libc_cv_pic_default)
2152 AC_SUBST(profile)
2153 AC_SUBST(static_nss)
2155 AC_SUBST(DEFINES)
2157 dnl See sysdeps/mach/configure.in for this variable.
2158 AC_SUBST(mach_interface_list)
2160 if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
2161 config_makefile=
2162 else
2163 config_makefile=Makefile
2164 fi
2166 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2167 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2168 AC_SUBST(VERSION)
2169 AC_SUBST(RELEASE)
2171 AC_CONFIG_FILES([config.make ${config_makefile}])
2172 AC_CONFIG_COMMANDS([default],[[
2173 case $CONFIG_FILES in *config.make*)
2174 echo "$config_vars" >> config.make;;
2175 esac
2176 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2177 AC_OUTPUT