| blob | 6b6dde5a831f4ae0872b2643e58d4f5fe68a1881 |
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 $CFLAGS"
281 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
282 void foo (int i, void *p)
283 {
284 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
285 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
286 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
287 CFLAGS="$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 .type directive prefix,
585 libc_cv_asm_type_prefix, [dnl
586 libc_cv_asm_type_prefix=no
587 for ac_try_prefix in '@' '%' '#'; do
588 cat > conftest.s <<EOF
589 ${libc_cv_dot_text}
590 .globl foo
591 .type foo, ${ac_try_prefix}object
592 .size foo, 1
593 foo:
594 .byte 1
595 EOF
596 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
597 libc_cv_asm_type_prefix=${ac_try_prefix}
598 fi
599 rm -f conftest*
600 test "x$libc_cv_asm_type_prefix" != xno && break
601 done])
602 if test "x$libc_cv_asm_type_prefix" != xno; then
603 AC_DEFINE_UNQUOTED(ASM_TYPE_DIRECTIVE_PREFIX, ${libc_cv_asm_type_prefix})
604 fi
606 if test x"$libc_cv_asm_gnu_indirect_function" != xyes -o x"$libc_cv_asm_type_prefix" = xno; then
607 if test x"$multi_arch" = xyes; then
608 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
609 else
610 multi_arch=no
611 fi
612 fi
613 if test x"$multi_arch" != xno; then
614 multi_arch_d=/multiarch
615 fi
617 # Compute the list of sysdep directories for this configuration.
618 # This can take a while to compute.
619 sysdep_dir=$srcdir/sysdeps
620 AC_MSG_CHECKING(sysdep dirs)
621 dnl We need to use [ and ] for other purposes for a while now.
622 changequote(,)dnl
623 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
624 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
626 test "x$base_os" != x || case "$os" in
627 gnu*)
628 base_os=mach/hurd ;;
629 linux*)
630 base_os=unix/sysv ;;
631 esac
633 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
634 tail=$os
635 ostry=$os
636 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
637 ostry="$ostry /$o"
638 tail=$o
639 done
640 o=`echo $tail | sed 's/[0-9]*$//'`
641 if test $o != $tail; then
642 ostry="$ostry /$o"
643 fi
644 # For linux-gnu, try linux-gnu, then linux.
645 o=`echo $tail | sed 's/-.*$//'`
646 if test $o != $tail; then
647 ostry="$ostry /$o"
648 fi
650 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
651 base=
652 tail=$base_os
653 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
654 set $b
655 base="$base /$1"
656 tail="$2"
657 done
659 # For sparc/sparc32, try sparc/sparc32 and then sparc.
660 mach=
661 tail=$machine${submachine:+/$submachine}
662 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
663 set $m
664 # Prepend the machine's FPU directory unless --without-fp.
665 if test "$with_fp" = yes; then
666 mach="$mach /$1/fpu"
667 else
668 mach="$mach /$1/nofpu"
669 fi
670 mach="$mach /$1"
671 tail="$2"
672 done
674 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
675 changequote([,])dnl
677 # Find what sysdep directories exist.
678 sysnames_add_ons=
679 sysnames=
680 for b in $base ''; do
681 for m0 in $mach ''; do
682 for v in /$vendor ''; do
683 test "$v" = / && continue
684 for o in /$ostry ''; do
685 test "$o" = / && continue
686 for m in $multi_arch_d $mach ''; do
687 for d in $add_ons_pfx ''; do
688 for a in $add_ons_sfx ''; do
689 if test -n "$m0$m0sub$b$v$o$m$msub"; then
690 try_srcdir="${srcdir}/"
691 case "$d" in
692 /*) try_srcdir= ;;
693 esac
694 try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
695 test -n "$enable_debug_configure" &&
696 echo "$0 [DEBUG]: try $try" >&2
697 if test -d "$try_srcdir$try"; then
698 sysnames="$sysnames $try"
699 { test -n "$o" || test -n "$b"; } && os_used=t
700 { test -n "$m" || test -n "$m0"; } && machine_used=t
701 case x${m0:-$m} in
702 x*/$submachine) submachine_used=t ;;
703 esac
704 if test -n "$d"; then
705 case "$sysnames_add_ons" in
706 *" $d "*) ;;
707 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
708 esac
709 fi
710 fi
711 fi
712 done
713 done
714 done
715 done
716 done
717 done
718 done
720 # If the assembler supports gnu_indirect_function symbol type and the
721 # architecture supports multi-arch, we enable multi-arch by default.
722 case $sysnames_add_ons$sysnames in
723 *"$multi_arch_d"*)
724 ;;
725 *)
726 test x"$multi_arch" = xdefault && multi_arch=no
727 ;;
728 esac
729 if test x"$multi_arch" != xno; then
730 AC_DEFINE(USE_MULTIARCH)
731 fi
732 AC_SUBST(multi_arch)
734 if test -z "$os_used" && test "$os" != none; then
735 AC_MSG_ERROR(Operating system $os is not supported.)
736 fi
737 if test -z "$machine_used" && test "$machine" != none; then
738 AC_MSG_ERROR(The $machine is not supported.)
739 fi
740 if test -z "$submachine_used" && test -n "$submachine"; then
741 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
742 fi
743 AC_SUBST(submachine)
745 # We have now validated the configuration.
747 # Expand the list of system names into a full list of directories
748 # from each element's parent name and Implies file (if present).
749 set $sysnames
750 names=
751 while test $# -gt 0; do
752 name=$1
753 shift
755 case " $names " in *" $name "*)
756 # Already in the list.
757 continue
758 esac
760 # Report each name as we discover it, so there is no long pause in output.
761 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
763 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
765 case $name in
766 /*) xsrcdir= ;;
767 *) xsrcdir=$srcdir/ ;;
768 esac
769 test -n "$enable_debug_configure" &&
770 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
772 for implies_file in Implies Implies-before Implies-after; do
773 implies_type=`echo $implies_file | sed s/-/_/`
774 eval ${implies_type}=
775 if test -f $xsrcdir$name/$implies_file; then
776 # Collect more names from the `Implies' file (removing comments).
777 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
778 for x in $implied_candidate; do
779 found=no
780 if test -d $xsrcdir$name_base/$x; then
781 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
782 found=yes
783 fi
784 for d in $add_ons_pfx ''; do
785 try="${d}sysdeps/$x"
786 case $d in
787 /*) try_srcdir= ;;
788 *) try_srcdir=$srcdir/ ;;
789 esac
790 test -n "$enable_debug_configure" &&
791 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
792 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
793 then
794 eval "${implies_type}=\"\$${implies_type} \$try\""
795 found=yes
796 case "$sysnames_add_ons" in
797 *" $d "*) ;;
798 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
799 esac
800 fi
801 done
802 if test $found = no; then
803 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
804 fi
805 done
806 fi
807 done
809 # Add NAME to the list of names.
810 names="$names $name"
812 # Find the parent of NAME, using the empty string if it has none.
813 changequote(,)dnl
814 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
815 changequote([,])dnl
817 test -n "$enable_debug_configure" &&
818 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
819 Implies_before='$Implies_after' Implies_after='$Implies_after'" >&2
821 # Add the names implied by NAME, and NAME's parent (if it has one), to
822 # the list of names to be processed (the argument list). We prepend the
823 # implied names to the list and append the parent. We want implied
824 # directories to come before further directories inferred from the
825 # configuration components; this ensures that for sysv4, unix/common
826 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
827 # after sysv4).
828 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
829 test -n "$sysnames" && set $sysnames
830 done
832 # Add the default directories.
833 default_sysnames="sysdeps/generic"
834 sysnames="$names $default_sysnames"
835 AC_SUBST(sysnames)
836 # The other names were emitted during the scan.
837 AC_MSG_RESULT($default_sysnames)
839 # Collect the list of add-ons that supply partial sysdeps trees.
840 sysdeps_add_ons=
841 for add_on in $add_ons; do
842 case "$add_on" in
843 /*) xsrcdir= ;;
844 *) xsrcdir="$srcdir/" ;;
845 esac
847 test -d "$xsrcdir$add_on/sysdeps" || {
848 case "$configured_add_ons " in
849 *" $add_on "*) ;;
850 *|'')
851 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
852 ;;
853 esac
854 continue
855 }
857 sysdeps_add_ons="$sysdeps_add_ons $add_on"
858 case "$sysnames_add_ons" in
859 *" $add_on/ "*) ;;
860 *|'')
861 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
862 continue ;;
863 esac
865 found=no
866 for d in $sysnames; do
867 case "$d" in
868 $add_on/sysdeps/*) ;;
869 *) continue ;;
870 esac
871 (cd "$xsrcdir$d" && for f in *[[!~]]; do
872 case "$f" in
873 sys|bits)
874 for ff in $f/*.h; do
875 test -d "$ff" || { test -e "$ff" && exit 88; }
876 done
877 ;;
878 *)
879 test -d "$f" || { test -e "$f" && exit 88; }
880 ;;
881 esac
882 done)
883 if test $? -eq 88; then
884 found=yes
885 break
886 fi
887 done
888 if test $found = no; then
889 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
890 fi
891 done
892 AC_SUBST(sysdeps_add_ons)
895 ### Locate tools.
897 AC_PROG_INSTALL
898 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
899 # The makefiles need to use a different form to find it in $srcdir.
900 INSTALL='\$(..)./scripts/install-sh -c'
901 fi
902 AC_PROG_LN_S
904 LIBC_PROG_BINUTILS
905 AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
907 # Accept binutils 2.20 or newer.
908 AC_CHECK_PROG_VER(AS, $AS, --version,
909 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
910 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
911 AC_CHECK_PROG_VER(LD, $LD, --version,
912 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
913 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
915 # These programs are version sensitive.
916 AC_CHECK_TOOL_PREFIX
917 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
918 [version \([egcygnustpi-]*[0-9.]*\)], [4.[3-9].* | 4.[1-9][0-9].* | [5-9].* ],
919 critic_missing="$critic_missing gcc")
920 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
921 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
922 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
924 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
925 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
926 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
927 MSGFMT=: aux_missing="$aux_missing msgfmt")
928 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
929 [GNU texinfo.* \([0-9][0-9.]*\)],
930 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
931 MAKEINFO=: aux_missing="$aux_missing makeinfo")
932 AC_CHECK_PROG_VER(SED, sed, --version,
933 [GNU sed version \([0-9]*\.[0-9.]*\)],
934 [3.0[2-9]*|3.[1-9]*|[4-9]*],
935 SED=: aux_missing="$aux_missing sed")
937 AC_CHECK_TOOL(READELF, readelf, false)
938 AC_CHECK_TOOL(NM, nm, false)
940 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
941 case "x$AUTOCONF" in
942 xno|x|x:) AUTOCONF=no ;;
943 *)
944 AC_CACHE_CHECK(dnl
945 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
946 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
947 libc_cv_autoconf_works=yes
948 else
949 libc_cv_autoconf_works=no
950 fi])
951 test $libc_cv_autoconf_works = yes || AUTOCONF=no
952 ;;
953 esac
954 if test "x$AUTOCONF" = xno; then
955 aux_missing="$aux_missing autoconf"
956 fi
958 test -n "$critic_missing" && AC_MSG_ERROR([
959 *** These critical programs are missing or too old:$critic_missing
960 *** Check the INSTALL file for required versions.])
962 test -n "$aux_missing" && AC_MSG_WARN([
963 *** These auxiliary programs are missing or incompatible versions:$aux_missing
964 *** some features will be disabled.
965 *** Check the INSTALL file for required versions.])
967 # if using special system headers, find out the compiler's sekrit
968 # header directory and add that to the list. NOTE: Only does the right
969 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
970 if test -n "$sysheaders"; then
971 SYSINCLUDES=-nostdinc
972 for d in include include-fixed; do
973 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
974 SYSINCLUDES="$SYSINCLUDES -isystem $i"
975 done
976 SYSINCLUDES="$SYSINCLUDES \
977 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
978 if test -n "$CXX"; then
979 CXX_SYSINCLUDES=
980 cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
981 cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
982 for d in include "$cxxmachine/include"; do
983 i=../../../../$d/c++/$cxxversion
984 cxxheaders=`$CXX -print-file-name="$i"` &&
985 test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
986 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
987 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
988 done
989 fi
990 fi
991 AC_SUBST(SYSINCLUDES)
992 AC_SUBST(CXX_SYSINCLUDES)
994 # Test if LD_LIBRARY_PATH contains the notation for the current directory
995 # since this would lead to problems installing/building glibc.
996 # LD_LIBRARY_PATH contains the current directory if one of the following
997 # is true:
998 # - one of the terminals (":" and ";") is the first or last sign
999 # - two terminals occur directly after each other
1000 # - the path contains an element with a dot in it
1001 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1002 changequote(,)dnl
1003 case ${LD_LIBRARY_PATH} in
1004 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1005 ld_library_path_setting="contains current directory"
1006 ;;
1007 *)
1008 ld_library_path_setting="ok"
1009 ;;
1010 esac
1011 changequote([,])dnl
1012 AC_MSG_RESULT($ld_library_path_setting)
1013 if test "$ld_library_path_setting" != "ok"; then
1014 AC_MSG_ERROR([
1015 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1016 *** building glibc. Please change the environment variable
1017 *** and run configure again.])
1018 fi
1020 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1021 if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
1022 libc_cv_gcc_static_libgcc=
1023 else
1024 libc_cv_gcc_static_libgcc=-static-libgcc
1025 fi])
1026 AC_SUBST(libc_cv_gcc_static_libgcc)
1028 AC_PATH_PROG(BASH_SHELL, bash, no)
1029 if test "$BASH_SHELL" != no &&
1030 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1031 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1032 libc_cv_have_bash2=yes
1033 else
1034 libc_cv_have_bash2=no
1035 fi
1036 AC_SUBST(libc_cv_have_bash2)
1038 dnl We need a ksh compatible shell for tzselect.
1039 if test "$BASH_SHELL" = no; then
1040 AC_PATH_PROG(KSH, ksh, no)
1041 if test "$KSH" = no; then
1042 libc_cv_have_ksh=no
1043 else
1044 libc_cv_have_ksh=yes
1045 fi
1046 else
1047 KSH="$BASH_SHELL"
1048 AC_SUBST(KSH)
1049 libc_cv_have_ksh=yes
1050 fi
1051 AC_SUBST(libc_cv_have_ksh)
1053 AC_PROG_AWK
1054 AC_PATH_PROG(PERL, perl, no)
1055 if test "$PERL" != no &&
1056 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1057 PERL=no
1058 fi
1059 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1060 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1061 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1063 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1064 AC_TRY_COMPILE(dnl
1065 [#define __need_size_t
1066 #define __need_wchar_t
1067 #include <stddef.h>
1068 #define __need_NULL
1069 #include <stddef.h>], [size_t size; wchar_t wchar;
1070 #ifdef offsetof
1071 #error stddef.h ignored __need_*
1072 #endif
1073 if (&size == NULL || &wchar == NULL) abort ();],
1074 libc_cv_friendly_stddef=yes,
1075 libc_cv_friendly_stddef=no)])
1076 if test $libc_cv_friendly_stddef = yes; then
1077 config_vars="$config_vars
1078 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1079 fi
1081 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1082 libc_cv_need_minus_P, [dnl
1083 cat > conftest.S <<EOF
1084 #include "confdefs.h"
1085 /* Nothing whatsoever. */
1086 EOF
1087 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1088 libc_cv_need_minus_P=no
1089 else
1090 libc_cv_need_minus_P=yes
1091 fi
1092 rm -f conftest*])
1093 if test $libc_cv_need_minus_P = yes; then
1094 config_vars="$config_vars
1095 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1096 fi
1098 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1099 cat > conftest.s <<EOF
1100 ${libc_cv_dot_text}
1101 foo:
1102 .set glibc_conftest_frobozz,foo
1103 .globl glibc_conftest_frobozz
1104 EOF
1105 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1106 # (but it doesn't work), so we must do a linking check to be sure.
1107 cat > conftest1.c <<\EOF
1108 extern int glibc_conftest_frobozz;
1109 void _start() { glibc_conftest_frobozz = 1; }
1110 EOF
1111 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1112 -nostartfiles -nostdlib \
1113 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1114 libc_cv_asm_set_directive=yes
1115 else
1116 libc_cv_asm_set_directive=no
1117 fi
1118 rm -f conftest*])
1119 if test $libc_cv_asm_set_directive = yes; then
1120 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1121 fi
1123 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1124 libc_cv_asm_unique_object, [dnl
1125 cat > conftest.s <<EOF
1126 ${libc_cv_dot_text}
1127 _sym:
1128 .type _sym, ${libc_cv_asm_type_prefix}gnu_unique_object
1129 EOF
1130 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1131 libc_cv_asm_unique_object=yes
1132 else
1133 libc_cv_asm_unique_object=no
1134 fi
1135 rm -f conftest*])
1136 if test $libc_cv_asm_unique_object = yes; then
1137 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1138 fi
1140 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1141 [cat > conftest.s <<EOF
1142 ${libc_cv_dot_text}
1143 _sym:
1144 .symver _sym,sym@VERS
1145 EOF
1146 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1147 libc_cv_asm_symver_directive=yes
1148 else
1149 libc_cv_asm_symver_directive=no
1150 fi
1151 rm -f conftest*])
1152 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1153 if test $libc_cv_asm_symver_directive = yes; then
1154 cat > conftest.s <<EOF
1155 ${libc_cv_dot_text}
1156 _sym:
1157 .symver _sym,sym@VERS
1158 EOF
1159 cat > conftest.map <<EOF
1160 VERS_1 {
1161 global: sym;
1162 };
1164 VERS_2 {
1165 global: sym;
1166 } VERS_1;
1167 EOF
1168 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1169 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1170 -o conftest.so conftest.o
1171 -nostartfiles -nostdlib
1172 -Wl,--version-script,conftest.map
1173 1>&AS_MESSAGE_LOG_FD]);
1174 then
1175 libc_cv_ld_version_script_option=yes
1176 else
1177 libc_cv_ld_version_script_option=no
1178 fi
1179 else
1180 libc_cv_ld_version_script_option=no
1181 fi
1182 else
1183 libc_cv_ld_version_script_option=no
1184 fi
1185 rm -f conftest*])
1186 if test $shared != no &&
1187 test $libc_cv_asm_symver_directive = yes &&
1188 test $libc_cv_ld_version_script_option = yes &&
1189 test $enable_versioning = yes; then
1190 VERSIONING=yes
1191 AC_DEFINE(DO_VERSIONING)
1192 else
1193 VERSIONING=no
1194 fi
1195 AC_SUBST(VERSIONING)
1197 if test $shared != no && test $VERSIONING = no; then
1198 echo "\
1199 *** WARNING: You should not compile GNU libc without versioning. Not using
1200 *** versioning will introduce incompatibilities so that old binaries
1201 *** will not run anymore.
1202 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1203 fi
1204 AC_CACHE_CHECK(for .previous assembler directive,
1205 libc_cv_asm_previous_directive, [dnl
1206 cat > conftest.s <<EOF
1207 .section foo_section
1208 .previous
1209 EOF
1210 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1211 libc_cv_asm_previous_directive=yes
1212 else
1213 libc_cv_asm_previous_directive=no
1214 fi
1215 rm -f conftest*])
1216 if test $libc_cv_asm_previous_directive = yes; then
1217 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1218 else
1219 AC_CACHE_CHECK(for .popsection assembler directive,
1220 libc_cv_asm_popsection_directive, [dnl
1221 cat > conftest.s <<EOF
1222 .pushsection foo_section
1223 .popsection
1224 EOF
1225 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1226 libc_cv_asm_popsection_directive=yes
1227 else
1228 libc_cv_asm_popsection_directive=no
1229 fi
1230 rm -f conftest*])
1231 if test $libc_cv_asm_popsection_directive = yes; then
1232 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1233 fi
1234 fi
1235 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1236 libc_cv_asm_protected_directive, [dnl
1237 cat > conftest.s <<EOF
1238 .protected foo
1239 foo:
1240 .hidden bar
1241 bar:
1242 EOF
1243 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1244 libc_cv_asm_protected_directive=yes
1245 else
1246 AC_MSG_ERROR(assembler support for symbol visibility is required)
1247 fi
1248 rm -f conftest*])
1250 if test $libc_cv_asm_protected_directive = yes; then
1251 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1252 libc_cv_visibility_attribute,
1253 [cat > conftest.c <<EOF
1254 int foo __attribute__ ((visibility ("hidden"))) = 1;
1255 int bar __attribute__ ((visibility ("protected"))) = 1;
1256 EOF
1257 libc_cv_visibility_attribute=no
1258 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1259 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1260 if grep '\.protected.*bar' conftest.s >/dev/null; then
1261 libc_cv_visibility_attribute=yes
1262 fi
1263 fi
1264 fi
1265 rm -f conftest.{c,s}
1266 ])
1267 if test $libc_cv_visibility_attribute != yes; then
1268 AC_MSG_ERROR(compiler support for visibility attribute is required)
1269 fi
1270 fi
1272 if test $libc_cv_visibility_attribute = yes; then
1273 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1274 libc_cv_broken_visibility_attribute,
1275 [cat > conftest.c <<EOF
1276 int foo (int x);
1277 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1278 int bar (int x) { return x; }
1279 EOF
1280 libc_cv_broken_visibility_attribute=yes
1281 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1282 changequote(,)dnl
1283 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1284 changequote([,])dnl
1285 libc_cv_broken_visibility_attribute=no
1286 fi
1287 fi
1288 rm -f conftest.c conftest.s
1289 ])
1290 if test $libc_cv_broken_visibility_attribute = yes; then
1291 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1292 fi
1293 fi
1295 AC_CACHE_CHECK(for broken __attribute__((alias())),
1296 libc_cv_broken_alias_attribute,
1297 [cat > conftest.c <<EOF
1298 extern int foo (int x) __asm ("xyzzy");
1299 int bar (int x) { return x; }
1300 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1301 extern int dfoo;
1302 extern __typeof (dfoo) dfoo __asm ("abccb");
1303 int dfoo = 1;
1304 EOF
1305 libc_cv_broken_alias_attribute=yes
1306 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1307 if grep 'xyzzy' conftest.s >/dev/null &&
1308 grep 'abccb' conftest.s >/dev/null; then
1309 libc_cv_broken_alias_attribute=no
1310 fi
1311 fi
1312 rm -f conftest.c conftest.s
1313 ])
1314 if test $libc_cv_broken_alias_attribute = yes; then
1315 AC_MSG_ERROR(working alias attribute support required)
1316 fi
1318 if test $libc_cv_visibility_attribute = yes; then
1319 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1320 libc_cv_have_sdata_section,
1321 [echo "int i;" > conftest.c
1322 libc_cv_have_sdata_section=no
1323 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1324 | grep '\.sdata' >/dev/null; then
1325 libc_cv_have_sdata_section=yes
1326 fi
1327 rm -f conftest.c conftest.so
1328 ])
1329 if test $libc_cv_have_sdata_section = yes; then
1330 AC_DEFINE(HAVE_SDATA_SECTION)
1331 fi
1332 fi
1334 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1335 libc_cv_initfini_array, [dnl
1336 LIBC_TRY_LINK_STATIC([
1337 int foo (void) { return 1; }
1338 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1339 ],
1340 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1341 libc_cv_initfini_array=yes
1342 else
1343 libc_cv_initfini_array=no
1344 fi],
1345 [libc_cv_initfini_array=no])
1346 ])
1347 if test $libc_cv_initfini_array != yes; then
1348 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1349 fi
1351 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1352 libc_cv_ctors_header, [dnl
1353 libc_cv_ctors_header=yes
1354 LIBC_TRY_LINK_STATIC([
1355 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1356 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1357 ],
1358 [dnl
1359 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1360 { gsub(/\@<:@ */, "@<:@") }
1361 $2 == ".ctors" || $2 == ".dtors" {
1362 size = strtonum("0x" $6)
1363 align = strtonum("0x" $NF)
1364 seen@<:@$2@:>@ = 1
1365 stub@<:@$2@:>@ = size == align * 2
1366 }
1367 END {
1368 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1369 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1370 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1371 }
1372 '], [libc_cv_ctors_header=no])
1373 ], [dnl
1374 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1375 ])
1376 ])
1377 if test $libc_cv_ctors_header = no; then
1378 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1379 fi
1381 AC_CACHE_CHECK(for libunwind-support in compiler,
1382 libc_cv_cc_with_libunwind, [
1383 cat > conftest.c <<EOF
1384 int main (void) { return 0; }
1385 EOF
1386 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1387 conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
1388 libc_cv_cc_with_libunwind=yes
1389 else
1390 libc_cv_cc_with_libunwind=no
1391 fi
1392 rm -f conftest*])
1393 AC_SUBST(libc_cv_cc_with_libunwind)
1394 if test $libc_cv_cc_with_libunwind = yes; then
1395 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1396 fi
1398 AC_CACHE_CHECK(for -z nodelete option,
1399 libc_cv_z_nodelete, [dnl
1400 cat > conftest.c <<EOF
1401 int _start (void) { return 42; }
1402 EOF
1403 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1404 -fPIC -shared -o conftest.so conftest.c
1405 -nostartfiles -nostdlib
1406 -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1407 then
1408 libc_cv_z_nodelete=yes
1409 else
1410 AC_MSG_ERROR(linker with -z nodelete support required)
1411 fi
1412 rm -f conftest*])
1414 AC_CACHE_CHECK(for -z nodlopen option,
1415 libc_cv_z_nodlopen, [dnl
1416 cat > conftest.c <<EOF
1417 int _start (void) { return 42; }
1418 EOF
1419 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1420 -fPIC -shared -o conftest.so conftest.c
1421 -nostartfiles -nostdlib
1422 -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1423 then
1424 libc_cv_z_nodlopen=yes
1425 else
1426 AC_MSG_ERROR(linker with -z nodlopen support required)
1427 fi
1428 rm -f conftest*])
1430 AC_CACHE_CHECK(for -z initfirst option,
1431 libc_cv_z_initfirst, [dnl
1432 cat > conftest.c <<EOF
1433 int _start (void) { return 42; }
1434 EOF
1435 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1436 -fPIC -shared -o conftest.so conftest.c
1437 -nostartfiles -nostdlib
1438 -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1439 then
1440 libc_cv_z_initfirst=yes
1441 else
1442 AC_MSG_ERROR(linker with -z initfirst support required)
1443 fi
1444 rm -f conftest*])
1446 # Add-on fragments can set these for other machines.
1447 libc_commonpagesize=${libc_commonpagesize:-no}
1448 libc_relro_required=${libc_relro_required:-no}
1449 case "$base_machine" in
1450 i[[34567]]86 | x86_64 | powerpc* | s390*)
1451 libc_commonpagesize=0x1000
1452 libc_relro_required=yes
1453 ;;
1454 sparc*)
1455 libc_commonpagesize=0x2000
1456 libc_relro_required=yes
1457 ;;
1458 esac
1460 if test $libc_commonpagesize != no; then
1461 AC_CACHE_CHECK(for -z relro option,
1462 libc_cv_z_relro, [dnl
1463 libc_cv_z_relro=no
1464 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1465 int _start (void) { return 42; }
1466 extern void _exit (int);
1467 /* Since these pointers are const, they should go in rodata.
1468 Since they refer to functions that have to be resolved by
1469 dynamic linking, they should instead go in RELRO data. */
1470 const void *const relro[] = { &_start, &_exit, 0 };
1471 /* GNU ld fails to produce RELRO data when it's very small and there is no
1472 normal writable data following it, or if only uninitialized (.bss) data
1473 follows it, or only very small writable data. */
1474 int data[0x10000] = { 1, };
1475 ]])])
1476 cat > conftest.awk <<\EOF
1477 BEGIN {
1478 result = "no"
1479 commonpagesize = strtonum(commonpagesize)
1480 }
1481 { print "LINE:", $0 > "/dev/stderr" }
1482 $1 == "GNU_RELRO" {
1483 vaddr = strtonum($3)
1484 memsz = strtonum($6)
1485 end = vaddr + memsz
1486 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1487 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1488 result = (end % commonpagesize == 0) ? "yes" : "broken"
1489 }
1490 END { print result }
1491 EOF
1492 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1493 -fPIC -shared -o conftest.so conftest.c
1494 -nostartfiles -nostdlib
1495 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1496 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1497 AC_TRY_COMMAND([
1498 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1499 conftest.ph > conftest.cps
1500 ]) &&
1501 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1502 rm -f conftest*])
1503 if { test "x$libc_relro_required" = xyes &&
1504 test "x$libc_cv_z_relro" != xyes
1505 }
1506 then
1507 AC_MSG_ERROR(linker with -z relro support required)
1508 fi
1509 else
1510 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1511 fi
1513 AC_CACHE_CHECK(for -Bgroup option,
1514 libc_cv_Bgroup, [dnl
1515 cat > conftest.c <<EOF
1516 int _start (void) { return 42; }
1517 EOF
1518 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1519 -fPIC -shared -o conftest.so conftest.c
1520 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1521 then
1522 libc_cv_Bgroup=yes
1523 else
1524 libc_cv_Bgroup=no
1525 fi
1526 rm -f conftest*])
1527 AC_SUBST(libc_cv_Bgroup)
1529 ASFLAGS_config=
1530 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1531 libc_cv_as_noexecstack, [dnl
1532 cat > conftest.c <<EOF
1533 void foo (void) { }
1534 EOF
1535 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1536 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1537 && grep -q .note.GNU-stack conftest.s \
1538 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1539 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1540 then
1541 libc_cv_as_noexecstack=yes
1542 else
1543 libc_cv_as_noexecstack=no
1544 fi
1545 rm -f conftest*])
1546 if test $libc_cv_as_noexecstack = yes; then
1547 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1548 fi
1549 AC_SUBST(ASFLAGS_config)
1551 AC_CACHE_CHECK(for -z combreloc,
1552 libc_cv_z_combreloc, [dnl
1553 cat > conftest.c <<EOF
1554 extern int bar (int);
1555 extern int mumble;
1556 int foo (void) { return bar (mumble); }
1557 EOF
1558 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1559 -fPIC -shared -o conftest.so conftest.c
1560 -nostdlib -nostartfiles
1561 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1562 then
1563 dnl The following test is a bit weak. We must use a tool which can test
1564 dnl cross-platform since the gcc used can be a cross compiler. Without
1565 dnl introducing new options this is not easily doable. Instead use a tool
1566 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1567 dnl look for a section named .rel.dyn.
1568 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1569 libc_cv_z_combreloc=yes
1570 else
1571 libc_cv_z_combreloc=no
1572 fi
1573 else
1574 libc_cv_z_combreloc=no
1575 fi
1576 rm -f conftest*])
1577 if test "$libc_cv_z_combreloc" = yes; then
1578 AC_DEFINE(HAVE_Z_COMBRELOC)
1579 fi
1580 AC_SUBST(libc_cv_z_combreloc)
1582 AC_CACHE_CHECK(for -z execstack,
1583 libc_cv_z_execstack, [dnl
1584 cat > conftest.c <<EOF
1585 int _start (void) { return 42; }
1586 EOF
1587 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1588 -fPIC -shared -o conftest.so conftest.c
1589 -Wl,-z,execstack -nostdlib
1590 1>&AS_MESSAGE_LOG_FD])
1591 then
1592 libc_cv_z_execstack=yes
1593 else
1594 libc_cv_z_execstack=no
1595 fi
1596 rm -f conftest*])
1597 AC_SUBST(libc_cv_z_execstack)
1599 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1600 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1601 ])
1603 AC_SUBST(libc_cv_fpie)
1605 AC_CACHE_CHECK(for --hash-style option,
1606 libc_cv_hashstyle, [dnl
1607 cat > conftest.c <<EOF
1608 int _start (void) { return 42; }
1609 EOF
1610 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1611 -fPIC -shared -o conftest.so conftest.c
1612 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1613 then
1614 libc_cv_hashstyle=yes
1615 else
1616 libc_cv_hashstyle=no
1617 fi
1618 rm -f conftest*])
1619 AC_SUBST(libc_cv_hashstyle)
1621 # The linker's default -shared behavior is good enough if it
1622 # does these things that our custom linker scripts ensure that
1623 # all allocated NOTE sections come first.
1624 if test "$use_default_link" = default; then
1625 AC_CACHE_CHECK([for sufficient default -shared layout],
1626 libc_cv_use_default_link, [dnl
1627 libc_cv_use_default_link=no
1628 cat > conftest.s <<\EOF
1629 .section .note.a,"a",%note
1630 .balign 4
1631 .long 4,4,9
1632 .string "GNU"
1633 .string "foo"
1634 .section .note.b,"a",%note
1635 .balign 4
1636 .long 4,4,9
1637 .string "GNU"
1638 .string "bar"
1639 EOF
1640 if AC_TRY_COMMAND([dnl
1641 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1642 ac_try=`$READELF -S conftest.so | sed -n \
1643 ['${x;p;}
1644 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1645 t a
1646 b
1647 : a
1648 H']`
1649 then
1650 libc_seen_a=no libc_seen_b=no
1651 set -- $ac_try
1652 while test $# -ge 2 -a "$1" = NOTE; do
1653 case "$2" in
1654 .note.a) libc_seen_a=yes ;;
1655 .note.b) libc_seen_b=yes ;;
1656 esac
1657 shift 2
1658 done
1659 case "$libc_seen_a$libc_seen_b" in
1660 yesyes)
1661 libc_cv_use_default_link=yes
1662 ;;
1663 *)
1664 echo >&AS_MESSAGE_LOG_FD "\
1665 $libc_seen_a$libc_seen_b from:
1666 $ac_try"
1667 ;;
1668 esac
1669 fi
1670 rm -f conftest*])
1671 use_default_link=$libc_cv_use_default_link
1672 fi
1674 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1675 if libc_cv_output_format=`
1676 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1677 then
1678 :
1679 else
1680 libc_cv_output_format=
1681 fi
1682 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1683 AC_SUBST(libc_cv_output_format)
1685 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1686 cat > conftest.c <<EOF
1687 int foo;
1688 EOF
1689 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1690 conftest.c 1>&AS_MESSAGE_LOG_FD])
1691 then
1692 libc_cv_fno_toplevel_reorder=yes
1693 else
1694 libc_cv_fno_toplevel_reorder=no
1695 fi
1696 rm -f conftest*])
1697 if test $libc_cv_fno_toplevel_reorder = yes; then
1698 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1699 else
1700 fno_unit_at_a_time=-fno-unit-at-a-time
1701 fi
1702 AC_SUBST(fno_unit_at_a_time)
1704 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1705 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1706 [libc_cv_ssp=yes],
1707 [libc_cv_ssp=no])
1708 ])
1709 AC_SUBST(libc_cv_ssp)
1711 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1712 cat > conftest.c <<EOF
1713 int foo;
1714 #ifdef __GNUC_GNU_INLINE__
1715 main () { return 0;}
1716 #else
1717 #error
1718 #endif
1719 EOF
1720 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1721 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1722 then
1723 libc_cv_gnu89_inline=yes
1724 else
1725 libc_cv_gnu89_inline=no
1726 fi
1727 rm -f conftest*])
1728 if test $libc_cv_gnu89_inline = yes; then
1729 gnu89_inline=-fgnu89-inline
1730 else
1731 gnu89_inline=
1732 fi
1733 AC_SUBST(gnu89_inline)
1735 AC_CACHE_CHECK(whether cc puts quotes around section names,
1736 libc_cv_have_section_quotes,
1737 [cat > conftest.c <<EOF
1738 static const int foo
1739 __attribute__ ((section ("bar"))) = 1;
1740 EOF
1741 if ${CC-cc} -S conftest.c -o conftest.s; then
1742 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1743 libc_cv_have_section_quotes=yes
1744 else
1745 libc_cv_have_section_quotes=no
1746 fi
1747 else
1748 libc_cv_have_section_quotes=unknown
1749 fi
1750 rm -f conftest.{c,s}
1751 ])
1752 if test $libc_cv_have_section_quotes = yes; then
1753 AC_DEFINE(HAVE_SECTION_QUOTES)
1754 fi
1756 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1757 [dnl
1758 cat > conftest.s <<EOF
1759 ${libc_cv_dot_text}
1760 .globl foo
1761 foo:
1762 .weak foo
1763 .weak bar; bar = foo
1764 EOF
1765 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1766 libc_cv_asm_weak_directive=yes
1767 else
1768 libc_cv_asm_weak_directive=no
1769 fi
1770 rm -f conftest*])
1772 if test $libc_cv_asm_weak_directive = no; then
1773 AC_CACHE_CHECK(for assembler .weakext directive,
1774 libc_cv_asm_weakext_directive,
1775 [dnl
1776 cat > conftest.s <<EOF
1777 ${libc_cv_dot_text}
1778 .globl foo
1779 foo:
1780 .weakext bar foo
1781 .weakext baz
1782 .globl baz
1783 baz:
1784 EOF
1785 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1786 libc_cv_asm_weakext_directive=yes
1787 else
1788 libc_cv_asm_weakext_directive=no
1789 fi
1790 rm -f conftest*])
1792 fi # no .weak
1794 if test $libc_cv_asm_weak_directive = yes; then
1795 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1796 elif test $libc_cv_asm_weakext_directive = yes; then
1797 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1798 fi
1800 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1801 case $machine in
1802 sparc/sparc64*) cfi_offset=2047;;
1803 *) cfi_offset=0;;
1804 esac
1805 cat > conftest.s <<EOF
1806 .text
1807 .type func,%function
1808 func:
1809 .cfi_startproc
1810 .cfi_remember_state
1811 .cfi_rel_offset 1, $cfi_offset
1812 .cfi_endproc
1813 EOF
1814 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1815 libc_cv_asm_cfi_directives=yes
1816 else
1817 libc_cv_asm_cfi_directives=no
1818 fi
1819 rm -f conftest*])
1820 if test $libc_cv_asm_cfi_directives = yes; then
1821 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1822 fi
1824 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1825 cat > conftest.c <<\EOF
1826 _start () {}
1827 int __eh_pc;
1828 __throw () {}
1829 EOF
1830 dnl No \ in command here because it ends up inside ''.
1831 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1832 -nostdlib -nostartfiles -Wl,--no-whole-archive
1833 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1834 libc_cv_ld_no_whole_archive=yes
1835 else
1836 libc_cv_ld_no_whole_archive=no
1837 fi
1838 rm -f conftest*])
1839 if test $libc_cv_ld_no_whole_archive = no; then
1840 AC_MSG_ERROR([support for --no-whole-archive is needed])
1841 fi
1843 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1844 cat > conftest.c <<\EOF
1845 _start () {}
1846 int __eh_pc;
1847 __throw () {}
1848 EOF
1849 dnl No \ in command here because it ends up inside ''.
1850 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1851 -nostdlib -nostartfiles -fexceptions
1852 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1853 libc_cv_gcc_exceptions=yes
1854 else
1855 libc_cv_gcc_exceptions=no
1856 fi
1857 rm -f conftest*])
1858 if test $libc_cv_gcc_exceptions = yes; then
1859 exceptions=-fexceptions
1860 fi
1861 AC_SUBST(exceptions)dnl
1863 if test "$host_cpu" = powerpc ; then
1864 # Check for a bug present in at least versions 2.8.x of GCC
1865 # and versions 1.0.x of EGCS.
1866 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1867 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1868 libc_cv_c_asmcr0_bug='no',
1869 libc_cv_c_asmcr0_bug='yes')])
1870 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1871 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1872 fi
1873 fi
1875 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1876 cat > conftest.c <<\EOF
1877 void zero (void *x)
1878 {
1879 __builtin_memset (x, 0, 1000);
1880 }
1881 EOF
1882 dnl
1883 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1884 then
1885 libc_cv_gcc_builtin_memset=no
1886 else
1887 libc_cv_gcc_builtin_memset=yes
1888 fi
1889 rm -f conftest* ])
1890 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1891 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1892 fi
1894 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1895 cat > conftest.c <<\EOF
1896 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1897 char *foo (const char *a, const char *b)
1898 {
1899 return __builtin_strstr (a, b);
1900 }
1901 EOF
1902 dnl
1903 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1904 then
1905 libc_cv_gcc_builtin_redirection=yes
1906 else
1907 libc_cv_gcc_builtin_redirection=no
1908 fi
1909 rm -f conftest* ])
1910 if test "$libc_cv_gcc_builtin_redirection" = no; then
1911 AC_MSG_ERROR([support for the symbol redirection needed])
1912 fi
1914 dnl Check whether the compiler supports the __thread keyword.
1915 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1916 [cat > conftest.c <<\EOF
1917 __thread int a = 42;
1918 EOF
1919 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1920 libc_cv_gcc___thread=yes
1921 else
1922 libc_cv_gcc___thread=no
1923 fi
1924 rm -f conftest*])
1925 if test "$libc_cv_gcc___thread" = no; then
1926 AC_MSG_ERROR([support for the __thread keyword is required])
1927 fi
1929 dnl Check whether the compiler supports the tls_model attribute.
1930 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1931 cat > conftest.c <<\EOF
1932 extern __thread int a __attribute__((tls_model ("initial-exec")));
1933 EOF
1934 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1935 libc_cv_gcc_tls_model_attr=yes
1936 else
1937 libc_cv_gcc_tls_model_attr=no
1938 fi
1939 rm -f conftest*])
1940 if test "$libc_cv_gcc_tls_model_attr" = no; then
1941 AC_MSG_ERROR([support for the tls_model attribute is required])
1942 fi
1944 dnl Determine how to disable generation of FMA instructions.
1945 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1946 libc_cv_cc_nofma, [dnl
1947 libc_cv_cc_nofma=
1948 for opt in -ffp-contract=off -mno-fused-madd; do
1949 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1950 done])
1952 if test -n "$submachine"; then
1953 AC_CACHE_CHECK([for compiler option for CPU variant],
1954 libc_cv_cc_submachine, [dnl
1955 libc_cv_cc_submachine=no
1956 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1957 LIBC_TRY_CC_OPTION([$opt], [
1958 libc_cv_cc_submachine="$opt"
1959 break], [])
1960 done])
1961 if test "x$libc_cv_cc_submachine" = xno; then
1962 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1963 fi
1964 fi
1965 AC_SUBST(libc_cv_cc_submachine)
1967 dnl Check whether we have the gd library available.
1968 AC_MSG_CHECKING(for libgd)
1969 if test "$with_gd" != "no"; then
1970 old_CFLAGS="$CFLAGS"
1971 CFLAGS="$CFLAGS $libgd_include"
1972 old_LDFLAGS="$LDFLAGS"
1973 LDFLAGS="$LDFLAGS $libgd_ldflags"
1974 old_LIBS="$LIBS"
1975 LIBS="$LIBS -lgd -lpng -lz -lm"
1976 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1977 CFLAGS="$old_CFLAGS"
1978 LDFLAGS="$old_LDFLAGS"
1979 LIBS="$old_LIBS"
1980 else
1981 LIBGD=no
1982 fi
1983 AC_MSG_RESULT($LIBGD)
1984 AC_SUBST(LIBGD)
1986 # SELinux detection
1987 if test x$with_selinux = xno ; then
1988 have_selinux=no;
1989 else
1990 # See if we have the SELinux library
1991 AC_CHECK_LIB(selinux, is_selinux_enabled,
1992 have_selinux=yes, have_selinux=no)
1993 # See if we have the SELinux header with the NSCD permissions in it.
1994 if test x$have_selinux = xyes ; then
1995 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1996 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1997 [#ifdef NSCD__SHMEMHOST
1998 return 0;
1999 #else
2000 #error NSCD__SHMEMHOST not defined
2001 #endif],
2002 have_selinux=yes, have_selinux=no)
2003 AC_MSG_RESULT($have_selinux)
2004 fi
2006 if test x$with_selinux = xyes ; then
2007 if test x$have_selinux = xno ; then
2008 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
2009 fi
2010 fi
2011 fi
2012 # Check if we're building with SELinux support.
2013 if test "x$have_selinux" = xyes; then
2014 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
2016 # See if we have the libaudit library
2017 AC_CHECK_LIB(audit, audit_log_user_avc_message,
2018 have_libaudit=yes, have_libaudit=no)
2019 if test "x$have_libaudit" = xyes; then
2020 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2021 fi
2022 AC_SUBST(have_libaudit)
2024 # See if we have the libcap library
2025 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2026 if test "x$have_libcap" = xyes; then
2027 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2028 fi
2029 AC_SUBST(have_libcap)
2030 fi
2031 AC_SUBST(have_selinux)
2033 dnl check for the size of 'long double'.
2034 AC_CHECK_SIZEOF(long double, 0)
2035 sizeof_long_double=$ac_cv_sizeof_long_double
2036 AC_SUBST(sizeof_long_double)
2038 CPPUNDEFS=
2039 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2040 dnl Since we are building the implementations of the fortified functions here,
2041 dnl having the macro defined interacts very badly.
2042 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2043 [AC_TRY_COMPILE([], [
2044 #ifdef _FORTIFY_SOURCE
2045 # error bogon
2046 #endif],
2047 [libc_cv_predef_fortify_source=no],
2048 [libc_cv_predef_fortify_source=yes])])
2049 if test $libc_cv_predef_fortify_source = yes; then
2050 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2051 fi
2052 AC_SUBST(CPPUNDEFS)
2054 dnl Check for silly hacked compilers inserting -fstack-protector.
2055 dnl This breaks badly for the early startup code we compile, since
2056 dnl the compiled code can refer to a magic machine-dependent location
2057 dnl for the canary value before we have sufficient setup for that to
2058 dnl work. It's also questionable to build all of libc with this flag
2059 dnl even when you're doing that for most applications you build, since
2060 dnl libc's code is so heavily-used and performance-sensitive. If we
2061 dnl ever really want to make that work, it should be enabled explicitly
2062 dnl in the libc build, not inherited from implicit compiler settings.
2063 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2064 libc_cv_predef_stack_protector, [
2065 AC_TRY_COMPILE([extern void foobar (char *);],
2066 [char large_array[2048]; foobar (large_array);], [
2067 libc_undefs=`$NM -u conftest.o |
2068 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2069 2>&AS_MESSAGE_LOG_FD` || {
2070 AC_MSG_ERROR([confusing output from $NM -u])
2071 }
2072 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2073 # On some architectures, there are architecture-specific undefined
2074 # symbols (resolved by the linker), so filter out unknown symbols.
2075 # This will fail to produce the correct result if the compiler
2076 # defaults to -fstack-protector but this produces an undefined symbol
2077 # other than __stack_chk_fail. However, compilers like that have not
2078 # been encountered in practice.
2079 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2080 case "$libc_undefs" in
2081 foobar) libc_cv_predef_stack_protector=no ;;
2082 '__stack_chk_fail
2083 foobar') libc_cv_predef_stack_protector=yes ;;
2084 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2085 esac],
2086 [AC_MSG_ERROR([test compilation failed])])
2087 ])
2088 libc_extra_cflags=
2089 if test $libc_cv_predef_stack_protector = yes; then
2090 libc_extra_cflags=-fno-stack-protector
2091 fi
2092 AC_SUBST(libc_extra_cflags)
2094 ### End of automated tests.
2095 ### Now run sysdeps configure fragments.
2097 # They also can set these variables.
2098 use_ldconfig=no
2099 ldd_rewrite_script=no
2100 libc_cv_sysconfdir=$sysconfdir
2101 libc_cv_localstatedir=$localstatedir
2102 libc_cv_gcc_unwind_find_fde=no
2103 libc_cv_idn=no
2105 # Iterate over all the sysdep directories we will use, running their
2106 # configure fragments.
2107 for dir in $sysnames; do
2108 case $dir in
2109 /*) dest=$dir ;;
2110 *) dest=$srcdir/$dir ;;
2111 esac
2112 if test -r $dest/configure; then
2113 AC_MSG_RESULT(running configure fragment for $dir)
2114 . $dest/configure
2115 fi
2116 done
2118 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2119 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2120 fi
2121 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2123 # Test for old glibc 2.0.x headers so that they can be removed properly
2124 # Search only in includedir.
2125 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2126 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2127 then
2128 old_glibc_headers=yes
2129 else
2130 old_glibc_headers=no
2131 fi
2132 AC_MSG_RESULT($old_glibc_headers)
2133 if test ${old_glibc_headers} = yes; then
2134 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2135 AC_MSG_WARN(*** be removed.)
2136 fi
2137 AC_SUBST(old_glibc_headers)
2139 AC_SUBST(libc_cv_slibdir)
2140 AC_SUBST(libc_cv_localedir)
2141 AC_SUBST(libc_cv_sysconfdir)
2142 AC_SUBST(libc_cv_localstatedir)
2143 AC_SUBST(libc_cv_rootsbindir)
2144 AC_SUBST(libc_cv_forced_unwind)
2146 dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
2147 AC_SUBST(libc_cv_cpp_asm_debuginfo)
2148 AC_SUBST(libc_cv_cc_sse4)
2149 AC_SUBST(libc_cv_cc_avx)
2150 AC_SUBST(libc_cv_cc_sse2avx)
2151 AC_SUBST(libc_cv_cc_novzeroupper)
2152 AC_SUBST(libc_cv_cc_fma4)
2153 AC_SUBST(libc_cv_cc_nofma)
2154 AC_SUBST(libc_cv_as_i686)
2155 AC_SUBST(libc_cv_sparc_as_vis3)
2157 AC_SUBST(use_ldconfig)
2158 AC_SUBST(ldd_rewrite_script)
2160 AC_SUBST(static)
2161 AC_SUBST(shared)
2163 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2164 [libc_cv_pic_default=yes
2165 cat > conftest.c <<EOF
2166 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2167 # error PIC is default.
2168 #endif
2169 EOF
2170 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2171 libc_cv_pic_default=no
2172 fi
2173 rm -f conftest.*])
2174 AC_SUBST(libc_cv_pic_default)
2176 AC_SUBST(profile)
2177 AC_SUBST(static_nss)
2179 AC_SUBST(DEFINES)
2181 dnl See sysdeps/mach/configure.in for this variable.
2182 AC_SUBST(mach_interface_list)
2184 if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
2185 config_makefile=
2186 else
2187 config_makefile=Makefile
2188 fi
2190 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2191 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2192 AC_SUBST(VERSION)
2193 AC_SUBST(RELEASE)
2195 AC_CONFIG_FILES([config.make ${config_makefile}])
2196 AC_CONFIG_COMMANDS([default],[[
2197 case $CONFIG_FILES in *config.make*)
2198 echo "$config_vars" >> config.make;;
2199 esac
2200 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2201 AC_OUTPUT