| blob | f5dbff68ccd822a58e85a896614a931774cb31c5 |
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=$withval],
97 [sysheaders=''])
98 AC_SUBST(sysheaders)
100 AC_SUBST(use_default_link)
101 AC_ARG_WITH([default-link],
102 AC_HELP_STRING([--with-default-link],
103 [do not use explicit linker scripts]),
104 [use_default_link=$withval],
105 [use_default_link=default])
107 AC_ARG_ENABLE([sanity-checks],
108 AC_HELP_STRING([--disable-sanity-checks],
109 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
110 [enable_sanity=$enableval],
111 [enable_sanity=yes])
113 AC_ARG_ENABLE([shared],
114 AC_HELP_STRING([--enable-shared],
115 [build shared library @<:@default=yes if GNU ld@:>@]),
116 [shared=$enableval],
117 [shared=yes])
118 AC_ARG_ENABLE([profile],
119 AC_HELP_STRING([--enable-profile],
120 [build profiled library @<:@default=no@:>@]),
121 [profile=$enableval],
122 [profile=no])
123 AC_ARG_ENABLE([versioning],
124 AC_HELP_STRING([--disable-versioning],
125 [do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
126 [enable_versioning=$enableval],
127 [enable_versioning=yes])
129 AC_ARG_ENABLE([oldest-abi],
130 AC_HELP_STRING([--enable-oldest-abi=ABI],
131 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
132 [oldest_abi=$enableval],
133 [oldest_abi=no])
134 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
135 oldest_abi=default
136 else
137 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
138 fi
139 AC_SUBST(oldest_abi)
141 AC_ARG_ENABLE([stackguard-randomization],
142 AC_HELP_STRING([--enable-stackguard-randomization],
143 [initialize __stack_chk_guard canary with a random number at program start]),
144 [enable_stackguard_randomize=$enableval],
145 [enable_stackguard_randomize=no])
146 if test "$enable_stackguard_randomize" = yes; then
147 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
148 fi
150 dnl Generic infrastructure for drop-in additions to libc.
151 AC_ARG_ENABLE([add-ons],
152 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
153 [configure and build add-ons in DIR1,DIR2,...
154 search for add-ons if no parameter given]),
155 , [enable_add_ons=yes])
157 AC_ARG_ENABLE([hidden-plt],
158 AC_HELP_STRING([--disable-hidden-plt],
159 [do not hide internal function calls to avoid PLT]),
160 [hidden=$enableval],
161 [hidden=yes])
162 if test "x$hidden" = xno; then
163 AC_DEFINE(NO_HIDDEN)
164 fi
166 AC_ARG_ENABLE([bind-now],
167 AC_HELP_STRING([--enable-bind-now],
168 [disable lazy relocations in DSOs]),
169 [bindnow=$enableval],
170 [bindnow=no])
171 AC_SUBST(bindnow)
173 dnl On some platforms we cannot use dynamic loading. We must provide
174 dnl static NSS modules.
175 AC_ARG_ENABLE([static-nss],
176 AC_HELP_STRING([--enable-static-nss],
177 [build static NSS modules @<:@default=no@:>@]),
178 [static_nss=$enableval],
179 [static_nss=no])
180 dnl Enable static NSS also if we build no shared objects.
181 if test x"$static_nss" = xyes || test x"$shared" = xno; then
182 static_nss=yes
183 AC_DEFINE(DO_STATIC_NSS)
184 fi
186 AC_ARG_ENABLE([force-install],
187 AC_HELP_STRING([--disable-force-install],
188 [don't force installation of files from this package, even if they are older than the installed files]),
189 [force_install=$enableval],
190 [force_install=yes])
191 AC_SUBST(force_install)
193 dnl On some platforms we allow dropping compatibility with all kernel
194 dnl versions.
195 AC_ARG_ENABLE([kernel],
196 AC_HELP_STRING([--enable-kernel=VERSION],
197 [compile for compatibility with kernel not older than VERSION]),
198 [minimum_kernel=$enableval],
199 [])
200 dnl Prevent unreasonable values.
201 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
202 # Better nothing than this.
203 minimum_kernel=""
204 else
205 if test "$minimum_kernel" = current; then
206 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
207 fi
208 fi
210 dnl For the development we sometimes want gcc to issue even more warnings.
211 dnl This is not the default since many of the extra warnings are not
212 dnl appropriate.
213 AC_ARG_ENABLE([all-warnings],
214 AC_HELP_STRING([--enable-all-warnings],
215 [enable all useful warnings gcc can issue]),
216 [all_warnings=$enableval],
217 [])
218 AC_SUBST(all_warnings)
220 AC_ARG_ENABLE([multi-arch],
221 AC_HELP_STRING([--enable-multi-arch],
222 [enable single DSO with optimizations for multiple architectures]),
223 [multi_arch=$enableval],
224 [multi_arch=default])
226 AC_ARG_ENABLE([nss-crypt],
227 AC_HELP_STRING([--enable-nss-crypt],
228 [enable libcrypt to use nss]),
229 [nss_crypt=$enableval],
230 [nss_crypt=no])
231 if test x$nss_crypt = xyes; then
232 nss_includes=-I$(nss-config --includedir 2>/dev/null)
233 if test $? -ne 0; then
234 AC_MSG_ERROR([cannot find include directory with nss-config])
235 fi
236 old_CFLAGS="$CFLAGS"
237 CFLAGS="$CFLAGS $nss_includes"
238 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
239 #include <hasht.h>
240 #include <nsslowhash.h>
241 void f (void) { NSSLOW_Init (); }])],
242 libc_cv_nss_crypt=yes,
243 AC_MSG_ERROR([
244 cannot find NSS headers with lowlevel hash function interfaces]))
245 old_LIBS="$LIBS"
246 LIBS="$LIBS -lfreebl3"
247 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
248 #include <hasht.h>
249 #include <nsslowhash.h>],
250 [NSSLOW_Init();])],
251 libc_cv_nss_crypt=yes,
252 AC_MSG_ERROR([
253 cannot link program using lowlevel NSS hash functions]))
254 CFLAGS="$old_CFLAGS"
255 LIBS="$old_LIBS"
256 else
257 libc_cv_nss_crypt=no
258 fi
259 AC_SUBST(libc_cv_nss_crypt)
262 AC_ARG_ENABLE([obsolete-rpc],
263 AC_HELP_STRING([--enable-obsolete-rpc],
264 [build and install the obsolete RPC code for link-time usage]),
265 [link_obsolete_rpc=$enableval],
266 [link_obsolete_rpc=no])
267 AC_SUBST(link_obsolete_rpc)
269 if test "$link_obsolete_rpc" = yes; then
270 AC_DEFINE(LINK_OBSOLETE_RPC)
271 fi
273 AC_ARG_ENABLE([systemtap],
274 [AS_HELP_STRING([--enable-systemtap],
275 [enable systemtap static probe points @<:@default=no@:>@])],
276 [systemtap=$enableval],
277 [systemtap=no])
278 if test "x$systemtap" != xno; then
279 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
280 old_CFLAGS="$CFLAGS"
281 CFLAGS="-std=gnu99 $CFLAGS"
282 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
283 void foo (int i, void *p)
284 {
285 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
286 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
287 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
288 CFLAGS="$old_CFLAGS"])
289 if test $libc_cv_sdt = yes; then
290 AC_DEFINE([USE_STAP_PROBE])
291 elif test "x$systemtap" != xauto; then
292 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
293 fi
294 fi
296 # The way shlib-versions is used to generate soversions.mk uses a
297 # fairly simplistic model for name recognition that can't distinguish
298 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
299 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
300 # tell. This doesn't get used much beyond that, so it's fairly safe.
301 case "$host_os" in
302 linux*)
303 ;;
304 gnu*)
305 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
306 ;;
307 esac
309 # We keep the original values in `$config_*' and never modify them, so we
310 # can write them unchanged into config.make. Everything else uses
311 # $machine, $vendor, and $os, and changes them whenever convenient.
312 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
314 # Don't allow vendor == "unknown"
315 test "$config_vendor" = unknown && config_vendor=
316 config_os="`echo $config_os | sed 's/^unknown-//'`"
318 # Some configurations imply other options.
319 elf=yes
321 # The configure fragment of an add-on port can modify these to supplement
322 # or override the table in the case statement below. No fragment should
323 # ever change the config_* variables, however.
324 machine=$config_machine
325 vendor=$config_vendor
326 os=$config_os
327 base_os=''
329 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
330 # Unify this here.
331 if test "$machine" = rs6000; then
332 machine="powerpc"
333 fi
335 # Braindead PowerPC box with absolutely no FPU.
336 case "$machine-$host_os" in
337 powerpc*-*soft)
338 with_fp=no
339 ;;
340 esac
342 submachine=
343 AC_ARG_WITH([cpu],
344 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
345 [dnl
346 case "$withval" in
347 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
348 no) ;;
349 *) submachine="$withval" ;;
350 esac
351 ])
353 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
354 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
356 # An add-on can set this when it wants to disable the sanity check below.
357 libc_config_ok=no
359 dnl Having this here, though empty, makes sure that if add-ons' fragments
360 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
361 dnl our AC_OUTPUT will actually use it.
362 AC_CONFIG_SUBDIRS()
364 case "$enable_add_ons" in
365 ''|no) add_ons= ;;
366 yes|'*')
367 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
368 sed 's@/[[^/]]*$@@' | sort | uniq`
369 add_ons_automatic=yes
370 ;;
371 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
372 add_ons_automatic=no ;;
373 esac
375 configured_add_ons=
376 add_ons_sfx=
377 add_ons_pfx=
378 if test x"$add_ons" != x; then
379 for f in $add_ons; do
380 # Some sanity checks
381 case "$f" in
382 crypt)
383 AC_MSG_ERROR([
384 *** It seems that you're using an old \`crypt' add-on. crypt is now
385 *** part of glibc and using the old add-on will not work with this
386 *** release. Start again with fresh sources and without the old
387 *** \`crypt' add-on.])
388 ;;
389 localedata)
390 AC_MSG_ERROR([
391 *** It seems that you're using an old \`localedata' add-on. localedata
392 *** is now part of glibc and using the old add-on will not work with
393 *** this release. Start again with fresh sources and without the old
394 *** \`localedata' add-on.])
395 ;;
396 esac
397 done
399 # Now source each add-on's configure fragment.
400 # The fragments can use $srcdir/$libc_add_on to find themselves,
401 # and test $add_ons_automatic to see if they were explicitly requested.
402 # A fragment can clear (or even change) $libc_add_on to affect
403 # whether it goes into the list to be actually used in the build.
404 use_add_ons=
405 for libc_add_on in $add_ons; do
406 # Test whether such a directory really exists.
407 # It can be absolute, or relative to $srcdir, or relative to the build dir.
408 case "$libc_add_on" in
409 /*)
410 libc_add_on_srcdir=$libc_add_on
411 ;;
412 *)
413 test -d "$srcdir/$libc_add_on" || {
414 if test -d "$libc_add_on"; then
415 libc_add_on="`pwd`/$libc_add_on"
416 else
417 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
418 fi
419 }
420 libc_add_on_srcdir=$srcdir/$libc_add_on
421 ;;
422 esac
424 libc_add_on_frag=$libc_add_on_srcdir/configure
425 libc_add_on_canonical=
426 libc_add_on_config_subdirs=
427 if test -r "$libc_add_on_frag"; then
428 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
429 libc_add_on_canonical=unknown
430 libc_add_on_subdirs=
431 . "$libc_add_on_frag"
432 test -z "$libc_add_on" || {
433 configured_add_ons="$configured_add_ons $libc_add_on"
434 if test "x$libc_add_on_canonical" = xunknown; then
435 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
436 fi
437 for d in $libc_add_on_subdirs; do
438 case "$libc_add_on" in
439 /*) subdir_srcdir="$libc_add_on" ;;
440 *) subdir_srcdir="\$(..)$libc_add_on" ;;
441 esac
442 case "$d" in
443 .)
444 d="${libc_add_on_canonical:-$libc_add_on}"
445 ;;
446 /*)
447 subdir_srcdir="$d"
448 ;;
449 *)
450 subdir_srcdir="$subdir_srcdir/$d"
451 ;;
452 esac
453 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
454 add_on_subdirs="$add_on_subdirs $d"
455 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
456 $d-srcdir = $subdir_srcdir"
457 done
458 for d in $libc_add_on_config_subdirs; do
459 case "$d" in
460 /*) AC_MSG_ERROR(dnl
461 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
462 esac
463 if test ! -d "$libc_add_on_srcdir/$d"; then
464 AC_MSG_ERROR(fragment wants to configure missing directory $d)
465 fi
466 case "$libc_add_on" in
467 /*) AC_MSG_ERROR(dnl
468 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
469 esac
470 subdirs="$subdirs $libc_add_on/$d"
471 done
472 }
473 fi
474 if test -n "$libc_add_on"; then
475 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
476 use_add_ons="$use_add_ons $libc_add_on"
477 add_ons_pfx="$add_ons_pfx $libc_add_on/"
478 test -z "$libc_add_on_canonical" ||
479 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
480 fi
481 done
482 # Use echo to strip excess whitespace.
483 add_ons="`echo $use_add_ons`"
484 fi
485 AC_SUBST(add_ons)
486 AC_SUBST(add_on_subdirs)
489 ###
490 ### I put this here to prevent those annoying emails from people who cannot
491 ### read and try to compile glibc on unsupported platforms. --drepper
492 ###
493 ### By using the undocumented --enable-hacker-mode option for configure
494 ### one can skip this test to make the configuration not fail for unsupported
495 ### platforms.
496 ###
497 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
498 case "$machine-$host_os" in
499 *-linux* | *-gnu*)
500 ;;
501 *)
502 echo "*** The GNU C library is currently not available for this platform."
503 echo "*** So far nobody cared to port it and if there is no volunteer it"
504 echo "*** might never happen. So, if you have interest to see glibc on"
505 echo "*** this platform visit"
506 echo "*** http://www.gnu.org/software/libc/porting.html"
507 echo "*** and join the group of porters"
508 exit 1
509 ;;
510 esac
511 fi
513 dnl We need to use [ and ] for other purposes for a while now.
514 changequote(,)dnl
515 # Expand the configuration machine name into a subdirectory by architecture
516 # type and particular chip. If an add-on configure fragment already set
517 # base_machine, we don't change it.
518 test -n "$base_machine" || case "$machine" in
519 i[34567]86) base_machine=i386 machine=i386/$machine ;;
520 powerpc) base_machine=powerpc machine=powerpc/powerpc32 ;;
521 powerpc64) base_machine=powerpc machine=powerpc/powerpc64 ;;
522 s390) base_machine=s390 machine=s390/s390-32 ;;
523 s390x) base_machine=s390 machine=s390/s390-64 ;;
524 sh3*) base_machine=sh machine=sh/sh3 ;;
525 sh4*) base_machine=sh machine=sh/sh4 ;;
526 sparc | sparcv[67])
527 base_machine=sparc machine=sparc/sparc32 ;;
528 sparcv8 | supersparc | hypersparc)
529 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
530 sparcv8plus | sparcv8plusa | sparcv9)
531 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
532 sparcv8plusb | sparcv9b)
533 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
534 sparcv9v)
535 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
536 sparcv9v2)
537 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
538 sparc64)
539 base_machine=sparc machine=sparc/sparc64 ;;
540 sparc64b)
541 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
542 sparc64v)
543 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
544 sparc64v2)
545 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
546 *) base_machine=$machine ;;
547 esac
548 changequote([,])dnl
549 AC_SUBST(base_machine)
551 if test "$base_machine" = "i386"; then
552 AC_DEFINE(USE_REGPARMS)
553 fi
555 # For the multi-arch option we need support in the assembler.
556 AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support],
557 libc_cv_asm_gnu_indirect_function, [dnl
558 cat > conftest.s <<EOF
559 .type foo,%gnu_indirect_function
560 EOF
561 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD;
562 then
563 libc_cv_asm_gnu_indirect_function=yes
564 else
565 libc_cv_asm_gnu_indirect_function=no
566 fi
567 rm -f conftest*])
569 AC_MSG_CHECKING(whether .text pseudo-op must be used)
570 AC_CACHE_VAL(libc_cv_dot_text, [dnl
571 cat > conftest.s <<EOF
572 .text
573 EOF
574 libc_cv_dot_text=
575 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
576 libc_cv_dot_text=.text
577 fi
578 rm -f conftest*])
579 if test -z "$libc_cv_dot_text"; then
580 AC_MSG_RESULT(no)
581 else
582 AC_MSG_RESULT(yes)
583 fi
585 if test x"$libc_cv_asm_gnu_indirect_function" != xyes; then
586 if test x"$multi_arch" = xyes; then
587 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
588 else
589 multi_arch=no
590 fi
591 fi
592 if test x"$multi_arch" != xno; then
593 multi_arch_d=/multiarch
594 fi
596 # Compute the list of sysdep directories for this configuration.
597 # This can take a while to compute.
598 sysdep_dir=$srcdir/sysdeps
599 AC_MSG_CHECKING(sysdep dirs)
600 dnl We need to use [ and ] for other purposes for a while now.
601 changequote(,)dnl
602 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
603 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
605 test "x$base_os" != x || case "$os" in
606 gnu*)
607 base_os=mach/hurd ;;
608 linux*)
609 base_os=unix/sysv ;;
610 esac
612 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
613 tail=$os
614 ostry=$os
615 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
616 ostry="$ostry /$o"
617 tail=$o
618 done
619 o=`echo $tail | sed 's/[0-9]*$//'`
620 if test $o != $tail; then
621 ostry="$ostry /$o"
622 fi
623 # For linux-gnu, try linux-gnu, then linux.
624 o=`echo $tail | sed 's/-.*$//'`
625 if test $o != $tail; then
626 ostry="$ostry /$o"
627 fi
629 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
630 base=
631 tail=$base_os
632 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
633 set $b
634 base="$base /$1"
635 tail="$2"
636 done
638 # For sparc/sparc32, try sparc/sparc32 and then sparc.
639 mach=
640 tail=$machine${submachine:+/$submachine}
641 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
642 set $m
643 # Prepend the machine's FPU directory unless --without-fp.
644 if test "$with_fp" = yes; then
645 mach="$mach /$1/fpu"
646 else
647 mach="$mach /$1/nofpu"
648 fi
649 mach="$mach /$1"
650 tail="$2"
651 done
653 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
654 changequote([,])dnl
656 # Find what sysdep directories exist.
657 sysnames_add_ons=
658 sysnames=
659 for b in $base ''; do
660 for m0 in $mach ''; do
661 for v in /$vendor ''; do
662 test "$v" = / && continue
663 for o in /$ostry ''; do
664 test "$o" = / && continue
665 for m in $multi_arch_d $mach ''; do
666 for d in $add_ons_pfx ''; do
667 for a in $add_ons_sfx ''; do
668 if test -n "$m0$m0sub$b$v$o$m$msub"; then
669 try_srcdir="${srcdir}/"
670 case "$d" in
671 /*) try_srcdir= ;;
672 esac
673 try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
674 test -n "$enable_debug_configure" &&
675 echo "$0 [DEBUG]: try $try" >&2
676 if test -d "$try_srcdir$try"; then
677 sysnames="$sysnames $try"
678 { test -n "$o" || test -n "$b"; } && os_used=t
679 { test -n "$m" || test -n "$m0"; } && machine_used=t
680 case x${m0:-$m} in
681 x*/$submachine) submachine_used=t ;;
682 esac
683 if test -n "$d"; then
684 case "$sysnames_add_ons" in
685 *" $d "*) ;;
686 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
687 esac
688 fi
689 fi
690 fi
691 done
692 done
693 done
694 done
695 done
696 done
697 done
699 # If the assembler supports gnu_indirect_function symbol type and the
700 # architecture supports multi-arch, we enable multi-arch by default.
701 case $sysnames_add_ons$sysnames in
702 *"$multi_arch_d"*)
703 ;;
704 *)
705 test x"$multi_arch" = xdefault && multi_arch=no
706 ;;
707 esac
708 if test x"$multi_arch" != xno; then
709 AC_DEFINE(USE_MULTIARCH)
710 fi
711 AC_SUBST(multi_arch)
713 if test -z "$os_used" && test "$os" != none; then
714 AC_MSG_ERROR(Operating system $os is not supported.)
715 fi
716 if test -z "$machine_used" && test "$machine" != none; then
717 AC_MSG_ERROR(The $machine is not supported.)
718 fi
719 if test -z "$submachine_used" && test -n "$submachine"; then
720 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
721 fi
722 AC_SUBST(submachine)
724 # We have now validated the configuration.
726 # Expand the list of system names into a full list of directories
727 # from each element's parent name and Implies file (if present).
728 set $sysnames
729 names=
730 while test $# -gt 0; do
731 name=$1
732 shift
734 case " $names " in *" $name "*)
735 # Already in the list.
736 continue
737 esac
739 # Report each name as we discover it, so there is no long pause in output.
740 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
742 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
744 case $name in
745 /*) xsrcdir= ;;
746 *) xsrcdir=$srcdir/ ;;
747 esac
748 test -n "$enable_debug_configure" &&
749 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
751 for implies_file in Implies Implies-before Implies-after; do
752 implies_type=`echo $implies_file | sed s/-/_/`
753 eval ${implies_type}=
754 if test -f $xsrcdir$name/$implies_file; then
755 # Collect more names from the `Implies' file (removing comments).
756 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
757 for x in $implied_candidate; do
758 found=no
759 if test -d $xsrcdir$name_base/$x; then
760 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
761 found=yes
762 fi
763 for d in $add_ons_pfx ''; do
764 try="${d}sysdeps/$x"
765 case $d in
766 /*) try_srcdir= ;;
767 *) try_srcdir=$srcdir/ ;;
768 esac
769 test -n "$enable_debug_configure" &&
770 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
771 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
772 then
773 eval "${implies_type}=\"\$${implies_type} \$try\""
774 found=yes
775 case "$sysnames_add_ons" in
776 *" $d "*) ;;
777 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
778 esac
779 fi
780 done
781 if test $found = no; then
782 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
783 fi
784 done
785 fi
786 done
788 # Add NAME to the list of names.
789 names="$names $name"
791 # Find the parent of NAME, using the empty string if it has none.
792 changequote(,)dnl
793 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
794 changequote([,])dnl
796 test -n "$enable_debug_configure" &&
797 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
798 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
800 # Add the names implied by NAME, and NAME's parent (if it has one), to
801 # the list of names to be processed (the argument list). We prepend the
802 # implied names to the list and append the parent. We want implied
803 # directories to come before further directories inferred from the
804 # configuration components; this ensures that for sysv4, unix/common
805 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
806 # after sysv4).
807 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
808 test -n "$sysnames" && set $sysnames
809 done
811 # Add the default directories.
812 default_sysnames="sysdeps/generic"
813 sysnames="$names $default_sysnames"
814 AC_SUBST(sysnames)
815 # The other names were emitted during the scan.
816 AC_MSG_RESULT($default_sysnames)
818 # Collect the list of add-ons that supply partial sysdeps trees.
819 sysdeps_add_ons=
820 for add_on in $add_ons; do
821 case "$add_on" in
822 /*) xsrcdir= ;;
823 *) xsrcdir="$srcdir/" ;;
824 esac
826 test -d "$xsrcdir$add_on/sysdeps" || {
827 case "$configured_add_ons " in
828 *" $add_on "*) ;;
829 *|'')
830 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
831 ;;
832 esac
833 continue
834 }
836 sysdeps_add_ons="$sysdeps_add_ons $add_on"
837 case "$sysnames_add_ons" in
838 *" $add_on/ "*) ;;
839 *|'')
840 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
841 continue ;;
842 esac
844 found=no
845 for d in $sysnames; do
846 case "$d" in
847 $add_on/sysdeps/*) ;;
848 *) continue ;;
849 esac
850 (cd "$xsrcdir$d" && for f in *[[!~]]; do
851 case "$f" in
852 sys|bits)
853 for ff in $f/*.h; do
854 test -d "$ff" || { test -e "$ff" && exit 88; }
855 done
856 ;;
857 *)
858 test -d "$f" || { test -e "$f" && exit 88; }
859 ;;
860 esac
861 done)
862 if test $? -eq 88; then
863 found=yes
864 break
865 fi
866 done
867 if test $found = no; then
868 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
869 fi
870 done
871 AC_SUBST(sysdeps_add_ons)
874 ### Locate tools.
876 AC_PROG_INSTALL
877 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
878 # The makefiles need to use a different form to find it in $srcdir.
879 INSTALL='\$(..)./scripts/install-sh -c'
880 fi
881 AC_PROG_LN_S
883 LIBC_PROG_BINUTILS
884 AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
886 # Accept binutils 2.20 or newer.
887 AC_CHECK_PROG_VER(AS, $AS, --version,
888 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
889 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
890 AC_CHECK_PROG_VER(LD, $LD, --version,
891 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
892 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
894 # These programs are version sensitive.
895 AC_CHECK_TOOL_PREFIX
896 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
897 [version \([egcygnustpi-]*[0-9.]*\)], [4.[3-9].* | 4.[1-9][0-9].* | [5-9].* ],
898 critic_missing="$critic_missing gcc")
899 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
900 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
901 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
903 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
904 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
905 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
906 MSGFMT=: aux_missing="$aux_missing msgfmt")
907 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
908 [GNU texinfo.* \([0-9][0-9.]*\)],
909 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
910 MAKEINFO=: aux_missing="$aux_missing makeinfo")
911 AC_CHECK_PROG_VER(SED, sed, --version,
912 [GNU sed version \([0-9]*\.[0-9.]*\)],
913 [3.0[2-9]*|3.[1-9]*|[4-9]*],
914 SED=: aux_missing="$aux_missing sed")
916 AC_CHECK_TOOL(READELF, readelf, false)
917 AC_CHECK_TOOL(NM, nm, false)
919 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
920 case "x$AUTOCONF" in
921 xno|x|x:) AUTOCONF=no ;;
922 *)
923 AC_CACHE_CHECK(dnl
924 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
925 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
926 libc_cv_autoconf_works=yes
927 else
928 libc_cv_autoconf_works=no
929 fi])
930 test $libc_cv_autoconf_works = yes || AUTOCONF=no
931 ;;
932 esac
933 if test "x$AUTOCONF" = xno; then
934 aux_missing="$aux_missing autoconf"
935 fi
937 test -n "$critic_missing" && AC_MSG_ERROR([
938 *** These critical programs are missing or too old:$critic_missing
939 *** Check the INSTALL file for required versions.])
941 test -n "$aux_missing" && AC_MSG_WARN([
942 *** These auxiliary programs are missing or incompatible versions:$aux_missing
943 *** some features will be disabled.
944 *** Check the INSTALL file for required versions.])
946 # if using special system headers, find out the compiler's sekrit
947 # header directory and add that to the list. NOTE: Only does the right
948 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
949 if test -n "$sysheaders"; then
950 SYSINCLUDES=-nostdinc
951 for d in include include-fixed; do
952 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
953 SYSINCLUDES="$SYSINCLUDES -isystem $i"
954 done
955 SYSINCLUDES="$SYSINCLUDES \
956 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
957 if test -n "$CXX"; then
958 CXX_SYSINCLUDES=
959 cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
960 cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
961 for d in include "$cxxmachine/include"; do
962 i=../../../../$d/c++/$cxxversion
963 cxxheaders=`$CXX -print-file-name="$i"` &&
964 test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
965 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
966 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
967 done
968 fi
969 fi
970 AC_SUBST(SYSINCLUDES)
971 AC_SUBST(CXX_SYSINCLUDES)
973 # Test if LD_LIBRARY_PATH contains the notation for the current directory
974 # since this would lead to problems installing/building glibc.
975 # LD_LIBRARY_PATH contains the current directory if one of the following
976 # is true:
977 # - one of the terminals (":" and ";") is the first or last sign
978 # - two terminals occur directly after each other
979 # - the path contains an element with a dot in it
980 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
981 changequote(,)dnl
982 case ${LD_LIBRARY_PATH} in
983 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
984 ld_library_path_setting="contains current directory"
985 ;;
986 *)
987 ld_library_path_setting="ok"
988 ;;
989 esac
990 changequote([,])dnl
991 AC_MSG_RESULT($ld_library_path_setting)
992 if test "$ld_library_path_setting" != "ok"; then
993 AC_MSG_ERROR([
994 *** LD_LIBRARY_PATH shouldn't contain the current directory when
995 *** building glibc. Please change the environment variable
996 *** and run configure again.])
997 fi
999 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1000 if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
1001 libc_cv_gcc_static_libgcc=
1002 else
1003 libc_cv_gcc_static_libgcc=-static-libgcc
1004 fi])
1005 AC_SUBST(libc_cv_gcc_static_libgcc)
1007 AC_PATH_PROG(BASH_SHELL, bash, no)
1008 if test "$BASH_SHELL" != no &&
1009 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1010 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1011 libc_cv_have_bash2=yes
1012 else
1013 libc_cv_have_bash2=no
1014 fi
1015 AC_SUBST(libc_cv_have_bash2)
1017 dnl We need a ksh compatible shell for tzselect.
1018 if test "$BASH_SHELL" = no; then
1019 AC_PATH_PROG(KSH, ksh, no)
1020 if test "$KSH" = no; then
1021 libc_cv_have_ksh=no
1022 else
1023 libc_cv_have_ksh=yes
1024 fi
1025 else
1026 KSH="$BASH_SHELL"
1027 AC_SUBST(KSH)
1028 libc_cv_have_ksh=yes
1029 fi
1030 AC_SUBST(libc_cv_have_ksh)
1032 AC_PROG_AWK
1033 AC_PATH_PROG(PERL, perl, no)
1034 if test "$PERL" != no &&
1035 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1036 PERL=no
1037 fi
1038 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1039 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1040 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1042 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1043 AC_TRY_COMPILE(dnl
1044 [#define __need_size_t
1045 #define __need_wchar_t
1046 #include <stddef.h>
1047 #define __need_NULL
1048 #include <stddef.h>], [size_t size; wchar_t wchar;
1049 #ifdef offsetof
1050 #error stddef.h ignored __need_*
1051 #endif
1052 if (&size == NULL || &wchar == NULL) abort ();],
1053 libc_cv_friendly_stddef=yes,
1054 libc_cv_friendly_stddef=no)])
1055 if test $libc_cv_friendly_stddef = yes; then
1056 config_vars="$config_vars
1057 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1058 fi
1060 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1061 libc_cv_need_minus_P, [dnl
1062 cat > conftest.S <<EOF
1063 #include "confdefs.h"
1064 /* Nothing whatsoever. */
1065 EOF
1066 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1067 libc_cv_need_minus_P=no
1068 else
1069 libc_cv_need_minus_P=yes
1070 fi
1071 rm -f conftest*])
1072 if test $libc_cv_need_minus_P = yes; then
1073 config_vars="$config_vars
1074 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1075 fi
1077 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1078 cat > conftest.s <<EOF
1079 ${libc_cv_dot_text}
1080 foo:
1081 .set glibc_conftest_frobozz,foo
1082 .globl glibc_conftest_frobozz
1083 EOF
1084 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1085 # (but it doesn't work), so we must do a linking check to be sure.
1086 cat > conftest1.c <<\EOF
1087 extern int glibc_conftest_frobozz;
1088 void _start() { glibc_conftest_frobozz = 1; }
1089 EOF
1090 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1091 -nostartfiles -nostdlib \
1092 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1093 libc_cv_asm_set_directive=yes
1094 else
1095 libc_cv_asm_set_directive=no
1096 fi
1097 rm -f conftest*])
1098 if test $libc_cv_asm_set_directive = yes; then
1099 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1100 fi
1102 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1103 libc_cv_asm_unique_object, [dnl
1104 cat > conftest.s <<EOF
1105 ${libc_cv_dot_text}
1106 _sym:
1107 .type _sym, %gnu_unique_object
1108 EOF
1109 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1110 libc_cv_asm_unique_object=yes
1111 else
1112 libc_cv_asm_unique_object=no
1113 fi
1114 rm -f conftest*])
1115 if test $libc_cv_asm_unique_object = yes; then
1116 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1117 fi
1119 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1120 [cat > conftest.s <<EOF
1121 ${libc_cv_dot_text}
1122 _sym:
1123 .symver _sym,sym@VERS
1124 EOF
1125 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1126 libc_cv_asm_symver_directive=yes
1127 else
1128 libc_cv_asm_symver_directive=no
1129 fi
1130 rm -f conftest*])
1131 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1132 if test $libc_cv_asm_symver_directive = yes; then
1133 cat > conftest.s <<EOF
1134 ${libc_cv_dot_text}
1135 _sym:
1136 .symver _sym,sym@VERS
1137 EOF
1138 cat > conftest.map <<EOF
1139 VERS_1 {
1140 global: sym;
1141 };
1143 VERS_2 {
1144 global: sym;
1145 } VERS_1;
1146 EOF
1147 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1148 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1149 -o conftest.so conftest.o
1150 -nostartfiles -nostdlib
1151 -Wl,--version-script,conftest.map
1152 1>&AS_MESSAGE_LOG_FD]);
1153 then
1154 libc_cv_ld_version_script_option=yes
1155 else
1156 libc_cv_ld_version_script_option=no
1157 fi
1158 else
1159 libc_cv_ld_version_script_option=no
1160 fi
1161 else
1162 libc_cv_ld_version_script_option=no
1163 fi
1164 rm -f conftest*])
1165 if test $shared != no &&
1166 test $libc_cv_asm_symver_directive = yes &&
1167 test $libc_cv_ld_version_script_option = yes &&
1168 test $enable_versioning = yes; then
1169 VERSIONING=yes
1170 AC_DEFINE(DO_VERSIONING)
1171 else
1172 VERSIONING=no
1173 fi
1174 AC_SUBST(VERSIONING)
1176 if test $shared != no && test $VERSIONING = no; then
1177 echo "\
1178 *** WARNING: You should not compile GNU libc without versioning. Not using
1179 *** versioning will introduce incompatibilities so that old binaries
1180 *** will not run anymore.
1181 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1182 fi
1183 AC_CACHE_CHECK(for .previous assembler directive,
1184 libc_cv_asm_previous_directive, [dnl
1185 cat > conftest.s <<EOF
1186 .section foo_section
1187 .previous
1188 EOF
1189 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1190 libc_cv_asm_previous_directive=yes
1191 else
1192 libc_cv_asm_previous_directive=no
1193 fi
1194 rm -f conftest*])
1195 if test $libc_cv_asm_previous_directive = yes; then
1196 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1197 else
1198 AC_CACHE_CHECK(for .popsection assembler directive,
1199 libc_cv_asm_popsection_directive, [dnl
1200 cat > conftest.s <<EOF
1201 .pushsection foo_section
1202 .popsection
1203 EOF
1204 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1205 libc_cv_asm_popsection_directive=yes
1206 else
1207 libc_cv_asm_popsection_directive=no
1208 fi
1209 rm -f conftest*])
1210 if test $libc_cv_asm_popsection_directive = yes; then
1211 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1212 fi
1213 fi
1214 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1215 libc_cv_asm_protected_directive, [dnl
1216 cat > conftest.s <<EOF
1217 .protected foo
1218 foo:
1219 .hidden bar
1220 bar:
1221 EOF
1222 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1223 libc_cv_asm_protected_directive=yes
1224 else
1225 AC_MSG_ERROR(assembler support for symbol visibility is required)
1226 fi
1227 rm -f conftest*])
1229 if test $libc_cv_asm_protected_directive = yes; then
1230 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1231 libc_cv_visibility_attribute,
1232 [cat > conftest.c <<EOF
1233 int foo __attribute__ ((visibility ("hidden"))) = 1;
1234 int bar __attribute__ ((visibility ("protected"))) = 1;
1235 EOF
1236 libc_cv_visibility_attribute=no
1237 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1238 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1239 if grep '\.protected.*bar' conftest.s >/dev/null; then
1240 libc_cv_visibility_attribute=yes
1241 fi
1242 fi
1243 fi
1244 rm -f conftest.{c,s}
1245 ])
1246 if test $libc_cv_visibility_attribute != yes; then
1247 AC_MSG_ERROR(compiler support for visibility attribute is required)
1248 fi
1249 fi
1251 if test $libc_cv_visibility_attribute = yes; then
1252 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1253 libc_cv_broken_visibility_attribute,
1254 [cat > conftest.c <<EOF
1255 int foo (int x);
1256 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1257 int bar (int x) { return x; }
1258 EOF
1259 libc_cv_broken_visibility_attribute=yes
1260 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1261 changequote(,)dnl
1262 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1263 changequote([,])dnl
1264 libc_cv_broken_visibility_attribute=no
1265 fi
1266 fi
1267 rm -f conftest.c conftest.s
1268 ])
1269 if test $libc_cv_broken_visibility_attribute = yes; then
1270 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1271 fi
1272 fi
1274 AC_CACHE_CHECK(for broken __attribute__((alias())),
1275 libc_cv_broken_alias_attribute,
1276 [cat > conftest.c <<EOF
1277 extern int foo (int x) __asm ("xyzzy");
1278 int bar (int x) { return x; }
1279 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1280 extern int dfoo;
1281 extern __typeof (dfoo) dfoo __asm ("abccb");
1282 int dfoo = 1;
1283 EOF
1284 libc_cv_broken_alias_attribute=yes
1285 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1286 if grep 'xyzzy' conftest.s >/dev/null &&
1287 grep 'abccb' conftest.s >/dev/null; then
1288 libc_cv_broken_alias_attribute=no
1289 fi
1290 fi
1291 rm -f conftest.c conftest.s
1292 ])
1293 if test $libc_cv_broken_alias_attribute = yes; then
1294 AC_MSG_ERROR(working alias attribute support required)
1295 fi
1297 if test $libc_cv_visibility_attribute = yes; then
1298 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1299 libc_cv_have_sdata_section,
1300 [echo "int i;" > conftest.c
1301 libc_cv_have_sdata_section=no
1302 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1303 | grep '\.sdata' >/dev/null; then
1304 libc_cv_have_sdata_section=yes
1305 fi
1306 rm -f conftest.c conftest.so
1307 ])
1308 if test $libc_cv_have_sdata_section = yes; then
1309 AC_DEFINE(HAVE_SDATA_SECTION)
1310 fi
1311 fi
1313 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1314 libc_cv_initfini_array, [dnl
1315 LIBC_TRY_LINK_STATIC([
1316 int foo (void) { return 1; }
1317 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1318 ],
1319 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1320 libc_cv_initfini_array=yes
1321 else
1322 libc_cv_initfini_array=no
1323 fi],
1324 [libc_cv_initfini_array=no])
1325 ])
1326 if test $libc_cv_initfini_array != yes; then
1327 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1328 fi
1330 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1331 libc_cv_ctors_header, [dnl
1332 libc_cv_ctors_header=yes
1333 LIBC_TRY_LINK_STATIC([
1334 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1335 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1336 ],
1337 [dnl
1338 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1339 { gsub(/\@<:@ */, "@<:@") }
1340 $2 == ".ctors" || $2 == ".dtors" {
1341 size = strtonum("0x" $6)
1342 align = strtonum("0x" $NF)
1343 seen@<:@$2@:>@ = 1
1344 stub@<:@$2@:>@ = size == align * 2
1345 }
1346 END {
1347 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1348 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1349 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1350 }
1351 '], [libc_cv_ctors_header=no])
1352 ], [dnl
1353 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1354 ])
1355 ])
1356 if test $libc_cv_ctors_header = no; then
1357 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1358 fi
1360 AC_CACHE_CHECK(for libunwind-support in compiler,
1361 libc_cv_cc_with_libunwind, [
1362 cat > conftest.c <<EOF
1363 int main (void) { return 0; }
1364 EOF
1365 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1366 conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
1367 libc_cv_cc_with_libunwind=yes
1368 else
1369 libc_cv_cc_with_libunwind=no
1370 fi
1371 rm -f conftest*])
1372 AC_SUBST(libc_cv_cc_with_libunwind)
1373 if test $libc_cv_cc_with_libunwind = yes; then
1374 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1375 fi
1377 AC_CACHE_CHECK(for -z nodelete option,
1378 libc_cv_z_nodelete, [dnl
1379 cat > conftest.c <<EOF
1380 int _start (void) { return 42; }
1381 EOF
1382 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1383 -fPIC -shared -o conftest.so conftest.c
1384 -nostartfiles -nostdlib
1385 -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1386 then
1387 libc_cv_z_nodelete=yes
1388 else
1389 AC_MSG_ERROR(linker with -z nodelete support required)
1390 fi
1391 rm -f conftest*])
1393 AC_CACHE_CHECK(for -z nodlopen option,
1394 libc_cv_z_nodlopen, [dnl
1395 cat > conftest.c <<EOF
1396 int _start (void) { return 42; }
1397 EOF
1398 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1399 -fPIC -shared -o conftest.so conftest.c
1400 -nostartfiles -nostdlib
1401 -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1402 then
1403 libc_cv_z_nodlopen=yes
1404 else
1405 AC_MSG_ERROR(linker with -z nodlopen support required)
1406 fi
1407 rm -f conftest*])
1409 AC_CACHE_CHECK(for -z initfirst option,
1410 libc_cv_z_initfirst, [dnl
1411 cat > conftest.c <<EOF
1412 int _start (void) { return 42; }
1413 EOF
1414 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1415 -fPIC -shared -o conftest.so conftest.c
1416 -nostartfiles -nostdlib
1417 -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1418 then
1419 libc_cv_z_initfirst=yes
1420 else
1421 AC_MSG_ERROR(linker with -z initfirst support required)
1422 fi
1423 rm -f conftest*])
1425 # Add-on fragments can set these for other machines.
1426 libc_commonpagesize=${libc_commonpagesize:-no}
1427 libc_relro_required=${libc_relro_required:-no}
1428 case "$base_machine" in
1429 i[[34567]]86 | x86_64 | powerpc* | s390*)
1430 libc_commonpagesize=0x1000
1431 libc_relro_required=yes
1432 ;;
1433 sparc*)
1434 libc_commonpagesize=0x2000
1435 libc_relro_required=yes
1436 ;;
1437 esac
1439 if test $libc_commonpagesize != no; then
1440 AC_CACHE_CHECK(for -z relro option,
1441 libc_cv_z_relro, [dnl
1442 libc_cv_z_relro=no
1443 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1444 int _start (void) { return 42; }
1445 extern void _exit (int);
1446 /* Since these pointers are const, they should go in rodata.
1447 Since they refer to functions that have to be resolved by
1448 dynamic linking, they should instead go in RELRO data. */
1449 const void *const relro[] = { &_start, &_exit, 0 };
1450 /* GNU ld fails to produce RELRO data when it's very small and there is no
1451 normal writable data following it, or if only uninitialized (.bss) data
1452 follows it, or only very small writable data. */
1453 int data[0x10000] = { 1, };
1454 ]])])
1455 cat > conftest.awk <<\EOF
1456 BEGIN {
1457 result = "no"
1458 commonpagesize = strtonum(commonpagesize)
1459 }
1460 { print "LINE:", $0 > "/dev/stderr" }
1461 $1 == "GNU_RELRO" {
1462 vaddr = strtonum($3)
1463 memsz = strtonum($6)
1464 end = vaddr + memsz
1465 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1466 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1467 result = (end % commonpagesize == 0) ? "yes" : "broken"
1468 }
1469 END { print result }
1470 EOF
1471 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1472 -fPIC -shared -o conftest.so conftest.c
1473 -nostartfiles -nostdlib
1474 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1475 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1476 AC_TRY_COMMAND([
1477 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1478 conftest.ph > conftest.cps
1479 ]) &&
1480 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1481 rm -f conftest*])
1482 if { test "x$libc_relro_required" = xyes &&
1483 test "x$libc_cv_z_relro" != xyes
1484 }
1485 then
1486 AC_MSG_ERROR(linker with -z relro support required)
1487 fi
1488 else
1489 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1490 fi
1492 AC_CACHE_CHECK(for -Bgroup option,
1493 libc_cv_Bgroup, [dnl
1494 cat > conftest.c <<EOF
1495 int _start (void) { return 42; }
1496 EOF
1497 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1498 -fPIC -shared -o conftest.so conftest.c
1499 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1500 then
1501 libc_cv_Bgroup=yes
1502 else
1503 libc_cv_Bgroup=no
1504 fi
1505 rm -f conftest*])
1506 AC_SUBST(libc_cv_Bgroup)
1508 ASFLAGS_config=
1509 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1510 libc_cv_as_noexecstack, [dnl
1511 cat > conftest.c <<EOF
1512 void foo (void) { }
1513 EOF
1514 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1515 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1516 && grep -q .note.GNU-stack conftest.s \
1517 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1518 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1519 then
1520 libc_cv_as_noexecstack=yes
1521 else
1522 libc_cv_as_noexecstack=no
1523 fi
1524 rm -f conftest*])
1525 if test $libc_cv_as_noexecstack = yes; then
1526 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1527 fi
1528 AC_SUBST(ASFLAGS_config)
1530 AC_CACHE_CHECK(for -z combreloc,
1531 libc_cv_z_combreloc, [dnl
1532 cat > conftest.c <<EOF
1533 extern int bar (int);
1534 extern int mumble;
1535 int foo (void) { return bar (mumble); }
1536 EOF
1537 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1538 -fPIC -shared -o conftest.so conftest.c
1539 -nostdlib -nostartfiles
1540 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1541 then
1542 dnl The following test is a bit weak. We must use a tool which can test
1543 dnl cross-platform since the gcc used can be a cross compiler. Without
1544 dnl introducing new options this is not easily doable. Instead use a tool
1545 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1546 dnl look for a section named .rel.dyn.
1547 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1548 libc_cv_z_combreloc=yes
1549 else
1550 libc_cv_z_combreloc=no
1551 fi
1552 else
1553 libc_cv_z_combreloc=no
1554 fi
1555 rm -f conftest*])
1556 if test "$libc_cv_z_combreloc" = yes; then
1557 AC_DEFINE(HAVE_Z_COMBRELOC)
1558 fi
1559 AC_SUBST(libc_cv_z_combreloc)
1561 AC_CACHE_CHECK(for -z execstack,
1562 libc_cv_z_execstack, [dnl
1563 cat > conftest.c <<EOF
1564 int _start (void) { return 42; }
1565 EOF
1566 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1567 -fPIC -shared -o conftest.so conftest.c
1568 -Wl,-z,execstack -nostdlib
1569 1>&AS_MESSAGE_LOG_FD])
1570 then
1571 libc_cv_z_execstack=yes
1572 else
1573 libc_cv_z_execstack=no
1574 fi
1575 rm -f conftest*])
1576 AC_SUBST(libc_cv_z_execstack)
1578 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1579 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1580 ])
1582 AC_SUBST(libc_cv_fpie)
1584 AC_CACHE_CHECK(for --hash-style option,
1585 libc_cv_hashstyle, [dnl
1586 cat > conftest.c <<EOF
1587 int _start (void) { return 42; }
1588 EOF
1589 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1590 -fPIC -shared -o conftest.so conftest.c
1591 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1592 then
1593 libc_cv_hashstyle=yes
1594 else
1595 libc_cv_hashstyle=no
1596 fi
1597 rm -f conftest*])
1598 AC_SUBST(libc_cv_hashstyle)
1600 # The linker's default -shared behavior is good enough if it
1601 # does these things that our custom linker scripts ensure that
1602 # all allocated NOTE sections come first.
1603 if test "$use_default_link" = default; then
1604 AC_CACHE_CHECK([for sufficient default -shared layout],
1605 libc_cv_use_default_link, [dnl
1606 libc_cv_use_default_link=no
1607 cat > conftest.s <<\EOF
1608 .section .note.a,"a",%note
1609 .balign 4
1610 .long 4,4,9
1611 .string "GNU"
1612 .string "foo"
1613 .section .note.b,"a",%note
1614 .balign 4
1615 .long 4,4,9
1616 .string "GNU"
1617 .string "bar"
1618 EOF
1619 if AC_TRY_COMMAND([dnl
1620 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1621 ac_try=`$READELF -S conftest.so | sed -n \
1622 ['${x;p;}
1623 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1624 t a
1625 b
1626 : a
1627 H']`
1628 then
1629 libc_seen_a=no libc_seen_b=no
1630 set -- $ac_try
1631 while test $# -ge 2 -a "$1" = NOTE; do
1632 case "$2" in
1633 .note.a) libc_seen_a=yes ;;
1634 .note.b) libc_seen_b=yes ;;
1635 esac
1636 shift 2
1637 done
1638 case "$libc_seen_a$libc_seen_b" in
1639 yesyes)
1640 libc_cv_use_default_link=yes
1641 ;;
1642 *)
1643 echo >&AS_MESSAGE_LOG_FD "\
1644 $libc_seen_a$libc_seen_b from:
1645 $ac_try"
1646 ;;
1647 esac
1648 fi
1649 rm -f conftest*])
1650 use_default_link=$libc_cv_use_default_link
1651 fi
1653 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1654 if libc_cv_output_format=`
1655 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1656 then
1657 :
1658 else
1659 libc_cv_output_format=
1660 fi
1661 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1662 AC_SUBST(libc_cv_output_format)
1664 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1665 cat > conftest.c <<EOF
1666 int foo;
1667 EOF
1668 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1669 conftest.c 1>&AS_MESSAGE_LOG_FD])
1670 then
1671 libc_cv_fno_toplevel_reorder=yes
1672 else
1673 libc_cv_fno_toplevel_reorder=no
1674 fi
1675 rm -f conftest*])
1676 if test $libc_cv_fno_toplevel_reorder = yes; then
1677 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1678 else
1679 fno_unit_at_a_time=-fno-unit-at-a-time
1680 fi
1681 AC_SUBST(fno_unit_at_a_time)
1683 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1684 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1685 [libc_cv_ssp=yes],
1686 [libc_cv_ssp=no])
1687 ])
1688 AC_SUBST(libc_cv_ssp)
1690 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1691 cat > conftest.c <<EOF
1692 int foo;
1693 #ifdef __GNUC_GNU_INLINE__
1694 main () { return 0;}
1695 #else
1696 #error
1697 #endif
1698 EOF
1699 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1700 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1701 then
1702 libc_cv_gnu89_inline=yes
1703 else
1704 libc_cv_gnu89_inline=no
1705 fi
1706 rm -f conftest*])
1707 if test $libc_cv_gnu89_inline = yes; then
1708 gnu89_inline=-fgnu89-inline
1709 else
1710 gnu89_inline=
1711 fi
1712 AC_SUBST(gnu89_inline)
1714 AC_CACHE_CHECK(whether cc puts quotes around section names,
1715 libc_cv_have_section_quotes,
1716 [cat > conftest.c <<EOF
1717 static const int foo
1718 __attribute__ ((section ("bar"))) = 1;
1719 EOF
1720 if ${CC-cc} -S conftest.c -o conftest.s; then
1721 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1722 libc_cv_have_section_quotes=yes
1723 else
1724 libc_cv_have_section_quotes=no
1725 fi
1726 else
1727 libc_cv_have_section_quotes=unknown
1728 fi
1729 rm -f conftest.{c,s}
1730 ])
1731 if test $libc_cv_have_section_quotes = yes; then
1732 AC_DEFINE(HAVE_SECTION_QUOTES)
1733 fi
1735 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1736 [dnl
1737 cat > conftest.s <<EOF
1738 ${libc_cv_dot_text}
1739 .globl foo
1740 foo:
1741 .weak foo
1742 .weak bar; bar = foo
1743 EOF
1744 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1745 libc_cv_asm_weak_directive=yes
1746 else
1747 libc_cv_asm_weak_directive=no
1748 fi
1749 rm -f conftest*])
1751 if test $libc_cv_asm_weak_directive = no; then
1752 AC_CACHE_CHECK(for assembler .weakext directive,
1753 libc_cv_asm_weakext_directive,
1754 [dnl
1755 cat > conftest.s <<EOF
1756 ${libc_cv_dot_text}
1757 .globl foo
1758 foo:
1759 .weakext bar foo
1760 .weakext baz
1761 .globl baz
1762 baz:
1763 EOF
1764 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1765 libc_cv_asm_weakext_directive=yes
1766 else
1767 libc_cv_asm_weakext_directive=no
1768 fi
1769 rm -f conftest*])
1771 fi # no .weak
1773 if test $libc_cv_asm_weak_directive = yes; then
1774 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1775 elif test $libc_cv_asm_weakext_directive = yes; then
1776 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1777 fi
1779 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1780 case $machine in
1781 sparc/sparc64*) cfi_offset=2047;;
1782 *) cfi_offset=0;;
1783 esac
1784 cat > conftest.s <<EOF
1785 .text
1786 .type func,%function
1787 func:
1788 .cfi_startproc
1789 .cfi_remember_state
1790 .cfi_rel_offset 1, $cfi_offset
1791 .cfi_endproc
1792 EOF
1793 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1794 libc_cv_asm_cfi_directives=yes
1795 else
1796 libc_cv_asm_cfi_directives=no
1797 fi
1798 rm -f conftest*])
1799 if test $libc_cv_asm_cfi_directives = yes; then
1800 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1801 fi
1803 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1804 cat > conftest.c <<\EOF
1805 _start () {}
1806 int __eh_pc;
1807 __throw () {}
1808 EOF
1809 dnl No \ in command here because it ends up inside ''.
1810 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1811 -nostdlib -nostartfiles -Wl,--no-whole-archive
1812 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1813 libc_cv_ld_no_whole_archive=yes
1814 else
1815 libc_cv_ld_no_whole_archive=no
1816 fi
1817 rm -f conftest*])
1818 if test $libc_cv_ld_no_whole_archive = no; then
1819 AC_MSG_ERROR([support for --no-whole-archive is needed])
1820 fi
1822 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1823 cat > conftest.c <<\EOF
1824 _start () {}
1825 int __eh_pc;
1826 __throw () {}
1827 EOF
1828 dnl No \ in command here because it ends up inside ''.
1829 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1830 -nostdlib -nostartfiles -fexceptions
1831 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1832 libc_cv_gcc_exceptions=yes
1833 else
1834 libc_cv_gcc_exceptions=no
1835 fi
1836 rm -f conftest*])
1837 if test $libc_cv_gcc_exceptions = yes; then
1838 exceptions=-fexceptions
1839 fi
1840 AC_SUBST(exceptions)dnl
1842 if test "$host_cpu" = powerpc ; then
1843 # Check for a bug present in at least versions 2.8.x of GCC
1844 # and versions 1.0.x of EGCS.
1845 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1846 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1847 libc_cv_c_asmcr0_bug='no',
1848 libc_cv_c_asmcr0_bug='yes')])
1849 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1850 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1851 fi
1852 fi
1854 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1855 cat > conftest.c <<\EOF
1856 void zero (void *x)
1857 {
1858 __builtin_memset (x, 0, 1000);
1859 }
1860 EOF
1861 dnl
1862 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1863 then
1864 libc_cv_gcc_builtin_memset=no
1865 else
1866 libc_cv_gcc_builtin_memset=yes
1867 fi
1868 rm -f conftest* ])
1869 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1870 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1871 fi
1873 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1874 cat > conftest.c <<\EOF
1875 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1876 char *foo (const char *a, const char *b)
1877 {
1878 return __builtin_strstr (a, b);
1879 }
1880 EOF
1881 dnl
1882 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1883 then
1884 libc_cv_gcc_builtin_redirection=yes
1885 else
1886 libc_cv_gcc_builtin_redirection=no
1887 fi
1888 rm -f conftest* ])
1889 if test "$libc_cv_gcc_builtin_redirection" = no; then
1890 AC_MSG_ERROR([support for the symbol redirection needed])
1891 fi
1893 dnl Check whether the compiler supports the __thread keyword.
1894 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1895 [cat > conftest.c <<\EOF
1896 __thread int a = 42;
1897 EOF
1898 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1899 libc_cv_gcc___thread=yes
1900 else
1901 libc_cv_gcc___thread=no
1902 fi
1903 rm -f conftest*])
1904 if test "$libc_cv_gcc___thread" = no; then
1905 AC_MSG_ERROR([support for the __thread keyword is required])
1906 fi
1908 dnl Check whether the compiler supports the tls_model attribute.
1909 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1910 cat > conftest.c <<\EOF
1911 extern __thread int a __attribute__((tls_model ("initial-exec")));
1912 EOF
1913 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1914 libc_cv_gcc_tls_model_attr=yes
1915 else
1916 libc_cv_gcc_tls_model_attr=no
1917 fi
1918 rm -f conftest*])
1919 if test "$libc_cv_gcc_tls_model_attr" = no; then
1920 AC_MSG_ERROR([support for the tls_model attribute is required])
1921 fi
1923 dnl Determine how to disable generation of FMA instructions.
1924 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1925 libc_cv_cc_nofma, [dnl
1926 libc_cv_cc_nofma=
1927 for opt in -ffp-contract=off -mno-fused-madd; do
1928 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1929 done])
1931 if test -n "$submachine"; then
1932 AC_CACHE_CHECK([for compiler option for CPU variant],
1933 libc_cv_cc_submachine, [dnl
1934 libc_cv_cc_submachine=no
1935 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1936 LIBC_TRY_CC_OPTION([$opt], [
1937 libc_cv_cc_submachine="$opt"
1938 break], [])
1939 done])
1940 if test "x$libc_cv_cc_submachine" = xno; then
1941 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1942 fi
1943 fi
1944 AC_SUBST(libc_cv_cc_submachine)
1946 dnl Check whether we have the gd library available.
1947 AC_MSG_CHECKING(for libgd)
1948 if test "$with_gd" != "no"; then
1949 old_CFLAGS="$CFLAGS"
1950 CFLAGS="$CFLAGS $libgd_include"
1951 old_LDFLAGS="$LDFLAGS"
1952 LDFLAGS="$LDFLAGS $libgd_ldflags"
1953 old_LIBS="$LIBS"
1954 LIBS="$LIBS -lgd -lpng -lz -lm"
1955 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1956 CFLAGS="$old_CFLAGS"
1957 LDFLAGS="$old_LDFLAGS"
1958 LIBS="$old_LIBS"
1959 else
1960 LIBGD=no
1961 fi
1962 AC_MSG_RESULT($LIBGD)
1963 AC_SUBST(LIBGD)
1965 # SELinux detection
1966 if test x$with_selinux = xno ; then
1967 have_selinux=no;
1968 else
1969 # See if we have the SELinux library
1970 AC_CHECK_LIB(selinux, is_selinux_enabled,
1971 have_selinux=yes, have_selinux=no)
1972 # See if we have the SELinux header with the NSCD permissions in it.
1973 if test x$have_selinux = xyes ; then
1974 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1975 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1976 [#ifdef NSCD__SHMEMHOST
1977 return 0;
1978 #else
1979 #error NSCD__SHMEMHOST not defined
1980 #endif],
1981 have_selinux=yes, have_selinux=no)
1982 AC_MSG_RESULT($have_selinux)
1983 fi
1985 if test x$with_selinux = xyes ; then
1986 if test x$have_selinux = xno ; then
1987 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
1988 fi
1989 fi
1990 fi
1991 # Check if we're building with SELinux support.
1992 if test "x$have_selinux" = xyes; then
1993 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1995 # See if we have the libaudit library
1996 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1997 have_libaudit=yes, have_libaudit=no)
1998 if test "x$have_libaudit" = xyes; then
1999 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2000 fi
2001 AC_SUBST(have_libaudit)
2003 # See if we have the libcap library
2004 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2005 if test "x$have_libcap" = xyes; then
2006 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2007 fi
2008 AC_SUBST(have_libcap)
2009 fi
2010 AC_SUBST(have_selinux)
2012 dnl check for the size of 'long double'.
2013 AC_CHECK_SIZEOF(long double, 0)
2014 sizeof_long_double=$ac_cv_sizeof_long_double
2015 AC_SUBST(sizeof_long_double)
2017 CPPUNDEFS=
2018 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2019 dnl Since we are building the implementations of the fortified functions here,
2020 dnl having the macro defined interacts very badly.
2021 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2022 [AC_TRY_COMPILE([], [
2023 #ifdef _FORTIFY_SOURCE
2024 # error bogon
2025 #endif],
2026 [libc_cv_predef_fortify_source=no],
2027 [libc_cv_predef_fortify_source=yes])])
2028 if test $libc_cv_predef_fortify_source = yes; then
2029 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2030 fi
2031 AC_SUBST(CPPUNDEFS)
2033 dnl Check for silly hacked compilers inserting -fstack-protector.
2034 dnl This breaks badly for the early startup code we compile, since
2035 dnl the compiled code can refer to a magic machine-dependent location
2036 dnl for the canary value before we have sufficient setup for that to
2037 dnl work. It's also questionable to build all of libc with this flag
2038 dnl even when you're doing that for most applications you build, since
2039 dnl libc's code is so heavily-used and performance-sensitive. If we
2040 dnl ever really want to make that work, it should be enabled explicitly
2041 dnl in the libc build, not inherited from implicit compiler settings.
2042 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2043 libc_cv_predef_stack_protector, [
2044 AC_TRY_COMPILE([extern void foobar (char *);],
2045 [char large_array[2048]; foobar (large_array);], [
2046 libc_undefs=`$NM -u conftest.o |
2047 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2048 2>&AS_MESSAGE_LOG_FD` || {
2049 AC_MSG_ERROR([confusing output from $NM -u])
2050 }
2051 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2052 # On some architectures, there are architecture-specific undefined
2053 # symbols (resolved by the linker), so filter out unknown symbols.
2054 # This will fail to produce the correct result if the compiler
2055 # defaults to -fstack-protector but this produces an undefined symbol
2056 # other than __stack_chk_fail. However, compilers like that have not
2057 # been encountered in practice.
2058 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2059 case "$libc_undefs" in
2060 foobar) libc_cv_predef_stack_protector=no ;;
2061 '__stack_chk_fail
2062 foobar') libc_cv_predef_stack_protector=yes ;;
2063 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2064 esac],
2065 [AC_MSG_ERROR([test compilation failed])])
2066 ])
2067 libc_extra_cflags=
2068 if test $libc_cv_predef_stack_protector = yes; then
2069 libc_extra_cflags=-fno-stack-protector
2070 fi
2071 AC_SUBST(libc_extra_cflags)
2073 ### End of automated tests.
2074 ### Now run sysdeps configure fragments.
2076 # They also can set these variables.
2077 use_ldconfig=no
2078 ldd_rewrite_script=no
2079 libc_cv_sysconfdir=$sysconfdir
2080 libc_cv_localstatedir=$localstatedir
2081 libc_cv_gcc_unwind_find_fde=no
2082 libc_cv_idn=no
2084 # Iterate over all the sysdep directories we will use, running their
2085 # configure fragments.
2086 for dir in $sysnames; do
2087 case $dir in
2088 /*) dest=$dir ;;
2089 *) dest=$srcdir/$dir ;;
2090 esac
2091 if test -r $dest/configure; then
2092 AC_MSG_RESULT(running configure fragment for $dir)
2093 . $dest/configure
2094 fi
2095 done
2097 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2098 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2099 fi
2100 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2102 # Test for old glibc 2.0.x headers so that they can be removed properly
2103 # Search only in includedir.
2104 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2105 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2106 then
2107 old_glibc_headers=yes
2108 else
2109 old_glibc_headers=no
2110 fi
2111 AC_MSG_RESULT($old_glibc_headers)
2112 if test ${old_glibc_headers} = yes; then
2113 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2114 AC_MSG_WARN(*** be removed.)
2115 fi
2116 AC_SUBST(old_glibc_headers)
2118 AC_SUBST(libc_cv_slibdir)
2119 AC_SUBST(libc_cv_localedir)
2120 AC_SUBST(libc_cv_sysconfdir)
2121 AC_SUBST(libc_cv_localstatedir)
2122 AC_SUBST(libc_cv_rootsbindir)
2123 AC_SUBST(libc_cv_forced_unwind)
2125 dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
2126 AC_SUBST(libc_cv_cpp_asm_debuginfo)
2127 AC_SUBST(libc_cv_cc_sse4)
2128 AC_SUBST(libc_cv_cc_avx)
2129 AC_SUBST(libc_cv_cc_sse2avx)
2130 AC_SUBST(libc_cv_cc_novzeroupper)
2131 AC_SUBST(libc_cv_cc_fma4)
2132 AC_SUBST(libc_cv_cc_nofma)
2133 AC_SUBST(libc_cv_as_i686)
2134 AC_SUBST(libc_cv_sparc_as_vis3)
2136 AC_SUBST(use_ldconfig)
2137 AC_SUBST(ldd_rewrite_script)
2139 AC_SUBST(static)
2140 AC_SUBST(shared)
2142 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2143 [libc_cv_pic_default=yes
2144 cat > conftest.c <<EOF
2145 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2146 # error PIC is default.
2147 #endif
2148 EOF
2149 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2150 libc_cv_pic_default=no
2151 fi
2152 rm -f conftest.*])
2153 AC_SUBST(libc_cv_pic_default)
2155 AC_SUBST(profile)
2156 AC_SUBST(static_nss)
2158 AC_SUBST(DEFINES)
2160 dnl See sysdeps/mach/configure.in for this variable.
2161 AC_SUBST(mach_interface_list)
2163 if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
2164 config_makefile=
2165 else
2166 config_makefile=Makefile
2167 fi
2169 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2170 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2171 AC_SUBST(VERSION)
2172 AC_SUBST(RELEASE)
2174 AC_CONFIG_FILES([config.make ${config_makefile}])
2175 AC_CONFIG_COMMANDS([default],[[
2176 case $CONFIG_FILES in *config.make*)
2177 echo "$config_vars" >> config.make;;
2178 esac
2179 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2180 AC_OUTPUT