| blob | a174646fab8cd9cd4b531dcf6a72b91acdee305b |
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 AC_ARG_ENABLE([build-nscd],
297 [AS_HELP_STRING([--disable-build-nscd],
298 [disable building and installing the nscd daemon])],
299 [build_nscd=$enableval],
300 [build_nscd=default])
301 AC_SUBST(build_nscd)
303 # Note the use of $use_nscd is near the bottom of the file.
304 AC_ARG_ENABLE([nscd],
305 [AS_HELP_STRING([--disable-nscd],
306 [library functions will not contact the nscd daemon])],
307 [use_nscd=$enableval],
308 [use_nscd=yes])
310 # The way shlib-versions is used to generate soversions.mk uses a
311 # fairly simplistic model for name recognition that can't distinguish
312 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
313 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
314 # tell. This doesn't get used much beyond that, so it's fairly safe.
315 case "$host_os" in
316 linux*)
317 ;;
318 gnu*)
319 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
320 ;;
321 esac
323 # We keep the original values in `$config_*' and never modify them, so we
324 # can write them unchanged into config.make. Everything else uses
325 # $machine, $vendor, and $os, and changes them whenever convenient.
326 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
328 # Don't allow vendor == "unknown"
329 test "$config_vendor" = unknown && config_vendor=
330 config_os="`echo $config_os | sed 's/^unknown-//'`"
332 # Some configurations imply other options.
333 elf=yes
335 # The configure fragment of an add-on port can modify these to supplement
336 # or override the table in the case statement below. No fragment should
337 # ever change the config_* variables, however.
338 machine=$config_machine
339 vendor=$config_vendor
340 os=$config_os
341 base_os=''
343 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
344 # Unify this here.
345 if test "$machine" = rs6000; then
346 machine="powerpc"
347 fi
349 # Braindead PowerPC box with absolutely no FPU.
350 case "$machine-$host_os" in
351 powerpc*-*soft)
352 with_fp=no
353 ;;
354 esac
356 submachine=
357 AC_ARG_WITH([cpu],
358 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
359 [dnl
360 case "$withval" in
361 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
362 no) ;;
363 *) submachine="$withval" ;;
364 esac
365 ])
367 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
368 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
370 # An add-on can set this when it wants to disable the sanity check below.
371 libc_config_ok=no
373 dnl Having this here, though empty, makes sure that if add-ons' fragments
374 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
375 dnl our AC_OUTPUT will actually use it.
376 AC_CONFIG_SUBDIRS()
378 case "$enable_add_ons" in
379 ''|no) add_ons= ;;
380 yes|'*')
381 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
382 sed 's@/[[^/]]*$@@' | sort | uniq`
383 add_ons_automatic=yes
384 ;;
385 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
386 add_ons_automatic=no ;;
387 esac
389 configured_add_ons=
390 add_ons_sfx=
391 add_ons_pfx=
392 if test x"$add_ons" != x; then
393 for f in $add_ons; do
394 # Some sanity checks
395 case "$f" in
396 crypt)
397 AC_MSG_ERROR([
398 *** It seems that you're using an old \`crypt' add-on. crypt is now
399 *** part of glibc and using the old add-on will not work with this
400 *** release. Start again with fresh sources and without the old
401 *** \`crypt' add-on.])
402 ;;
403 localedata)
404 AC_MSG_ERROR([
405 *** It seems that you're using an old \`localedata' add-on. localedata
406 *** is now part of glibc and using the old add-on will not work with
407 *** this release. Start again with fresh sources and without the old
408 *** \`localedata' add-on.])
409 ;;
410 esac
411 done
413 # Now source each add-on's configure fragment.
414 # The fragments can use $srcdir/$libc_add_on to find themselves,
415 # and test $add_ons_automatic to see if they were explicitly requested.
416 # A fragment can clear (or even change) $libc_add_on to affect
417 # whether it goes into the list to be actually used in the build.
418 use_add_ons=
419 for libc_add_on in $add_ons; do
420 # Test whether such a directory really exists.
421 # It can be absolute, or relative to $srcdir, or relative to the build dir.
422 case "$libc_add_on" in
423 /*)
424 libc_add_on_srcdir=$libc_add_on
425 ;;
426 *)
427 test -d "$srcdir/$libc_add_on" || {
428 if test -d "$libc_add_on"; then
429 libc_add_on="`pwd`/$libc_add_on"
430 else
431 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
432 fi
433 }
434 libc_add_on_srcdir=$srcdir/$libc_add_on
435 ;;
436 esac
438 libc_add_on_frag=$libc_add_on_srcdir/configure
439 libc_add_on_canonical=
440 libc_add_on_config_subdirs=
441 if test -r "$libc_add_on_frag"; then
442 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
443 libc_add_on_canonical=unknown
444 libc_add_on_subdirs=
445 . "$libc_add_on_frag"
446 test -z "$libc_add_on" || {
447 configured_add_ons="$configured_add_ons $libc_add_on"
448 if test "x$libc_add_on_canonical" = xunknown; then
449 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
450 fi
451 for d in $libc_add_on_subdirs; do
452 case "$libc_add_on" in
453 /*) subdir_srcdir="$libc_add_on" ;;
454 *) subdir_srcdir="\$(..)$libc_add_on" ;;
455 esac
456 case "$d" in
457 .)
458 d="${libc_add_on_canonical:-$libc_add_on}"
459 ;;
460 /*)
461 subdir_srcdir="$d"
462 ;;
463 *)
464 subdir_srcdir="$subdir_srcdir/$d"
465 ;;
466 esac
467 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
468 add_on_subdirs="$add_on_subdirs $d"
469 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
470 $d-srcdir = $subdir_srcdir"
471 done
472 for d in $libc_add_on_config_subdirs; do
473 case "$d" in
474 /*) AC_MSG_ERROR(dnl
475 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
476 esac
477 if test ! -d "$libc_add_on_srcdir/$d"; then
478 AC_MSG_ERROR(fragment wants to configure missing directory $d)
479 fi
480 case "$libc_add_on" in
481 /*) AC_MSG_ERROR(dnl
482 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
483 esac
484 subdirs="$subdirs $libc_add_on/$d"
485 done
486 }
487 fi
488 if test -n "$libc_add_on"; then
489 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
490 use_add_ons="$use_add_ons $libc_add_on"
491 add_ons_pfx="$add_ons_pfx $libc_add_on/"
492 test -z "$libc_add_on_canonical" ||
493 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
494 fi
495 done
496 # Use echo to strip excess whitespace.
497 add_ons="`echo $use_add_ons`"
498 fi
499 AC_SUBST(add_ons)
500 AC_SUBST(add_on_subdirs)
503 ###
504 ### I put this here to prevent those annoying emails from people who cannot
505 ### read and try to compile glibc on unsupported platforms. --drepper
506 ###
507 ### By using the undocumented --enable-hacker-mode option for configure
508 ### one can skip this test to make the configuration not fail for unsupported
509 ### platforms.
510 ###
511 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
512 case "$machine-$host_os" in
513 *-linux* | *-gnu*)
514 ;;
515 *)
516 echo "*** The GNU C library is currently not available for this platform."
517 echo "*** So far nobody cared to port it and if there is no volunteer it"
518 echo "*** might never happen. So, if you have interest to see glibc on"
519 echo "*** this platform visit"
520 echo "*** http://www.gnu.org/software/libc/porting.html"
521 echo "*** and join the group of porters"
522 exit 1
523 ;;
524 esac
525 fi
527 dnl We need to use [ and ] for other purposes for a while now.
528 changequote(,)dnl
529 # Expand the configuration machine name into a subdirectory by architecture
530 # type and particular chip. If an add-on configure fragment already set
531 # base_machine, we don't change it.
532 test -n "$base_machine" || case "$machine" in
533 i[34567]86) base_machine=i386 machine=i386/$machine ;;
534 powerpc) base_machine=powerpc machine=powerpc/powerpc32 ;;
535 powerpc64) base_machine=powerpc machine=powerpc/powerpc64 ;;
536 s390) base_machine=s390 machine=s390/s390-32 ;;
537 s390x) base_machine=s390 machine=s390/s390-64 ;;
538 sh3*) base_machine=sh machine=sh/sh3 ;;
539 sh4*) base_machine=sh machine=sh/sh4 ;;
540 sparc | sparcv[67])
541 base_machine=sparc machine=sparc/sparc32 ;;
542 sparcv8 | supersparc | hypersparc)
543 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
544 sparcv8plus | sparcv8plusa | sparcv9)
545 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
546 sparcv8plusb | sparcv9b)
547 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
548 sparcv9v)
549 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
550 sparcv9v2)
551 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
552 sparc64)
553 base_machine=sparc machine=sparc/sparc64 ;;
554 sparc64b)
555 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
556 sparc64v)
557 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
558 sparc64v2)
559 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
560 *) base_machine=$machine ;;
561 esac
562 changequote([,])dnl
563 AC_SUBST(base_machine)
565 if test "$base_machine" = "i386"; then
566 AC_DEFINE(USE_REGPARMS)
567 fi
569 # For the multi-arch option we need support in the assembler.
570 AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support],
571 libc_cv_asm_gnu_indirect_function, [dnl
572 cat > conftest.s <<EOF
573 .type foo,%gnu_indirect_function
574 EOF
575 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD;
576 then
577 libc_cv_asm_gnu_indirect_function=yes
578 else
579 libc_cv_asm_gnu_indirect_function=no
580 fi
581 rm -f conftest*])
583 AC_MSG_CHECKING(whether .text pseudo-op must be used)
584 AC_CACHE_VAL(libc_cv_dot_text, [dnl
585 cat > conftest.s <<EOF
586 .text
587 EOF
588 libc_cv_dot_text=
589 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
590 libc_cv_dot_text=.text
591 fi
592 rm -f conftest*])
593 if test -z "$libc_cv_dot_text"; then
594 AC_MSG_RESULT(no)
595 else
596 AC_MSG_RESULT(yes)
597 fi
599 if test x"$libc_cv_asm_gnu_indirect_function" != xyes; then
600 if test x"$multi_arch" = xyes; then
601 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
602 else
603 multi_arch=no
604 fi
605 fi
606 if test x"$multi_arch" != xno; then
607 multi_arch_d=/multiarch
608 fi
610 # Compute the list of sysdep directories for this configuration.
611 # This can take a while to compute.
612 sysdep_dir=$srcdir/sysdeps
613 AC_MSG_CHECKING(sysdep dirs)
614 dnl We need to use [ and ] for other purposes for a while now.
615 changequote(,)dnl
616 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
617 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
619 test "x$base_os" != x || case "$os" in
620 gnu*)
621 base_os=mach/hurd ;;
622 linux*)
623 base_os=unix/sysv ;;
624 esac
626 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
627 tail=$os
628 ostry=$os
629 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
630 ostry="$ostry /$o"
631 tail=$o
632 done
633 o=`echo $tail | sed 's/[0-9]*$//'`
634 if test $o != $tail; then
635 ostry="$ostry /$o"
636 fi
637 # For linux-gnu, try linux-gnu, then linux.
638 o=`echo $tail | sed 's/-.*$//'`
639 if test $o != $tail; then
640 ostry="$ostry /$o"
641 fi
643 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
644 base=
645 tail=$base_os
646 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
647 set $b
648 base="$base /$1"
649 tail="$2"
650 done
652 # For sparc/sparc32, try sparc/sparc32 and then sparc.
653 mach=
654 tail=$machine${submachine:+/$submachine}
655 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
656 set $m
657 # Prepend the machine's FPU directory unless --without-fp.
658 if test "$with_fp" = yes; then
659 mach="$mach /$1/fpu"
660 else
661 mach="$mach /$1/nofpu"
662 fi
663 mach="$mach /$1"
664 tail="$2"
665 done
667 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
668 changequote([,])dnl
670 # Find what sysdep directories exist.
671 sysnames_add_ons=
672 sysnames=
673 for b in $base ''; do
674 for m0 in $mach ''; do
675 for v in /$vendor ''; do
676 test "$v" = / && continue
677 for o in /$ostry ''; do
678 test "$o" = / && continue
679 for m in $multi_arch_d $mach ''; do
680 for d in $add_ons_pfx ''; do
681 for a in $add_ons_sfx ''; do
682 if test -n "$m0$m0sub$b$v$o$m$msub"; then
683 try_srcdir="${srcdir}/"
684 case "$d" in
685 /*) try_srcdir= ;;
686 esac
687 try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
688 test -n "$enable_debug_configure" &&
689 echo "$0 [DEBUG]: try $try" >&2
690 if test -d "$try_srcdir$try"; then
691 sysnames="$sysnames $try"
692 { test -n "$o" || test -n "$b"; } && os_used=t
693 { test -n "$m" || test -n "$m0"; } && machine_used=t
694 case x${m0:-$m} in
695 x*/$submachine) submachine_used=t ;;
696 esac
697 if test -n "$d"; then
698 case "$sysnames_add_ons" in
699 *" $d "*) ;;
700 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
701 esac
702 fi
703 fi
704 fi
705 done
706 done
707 done
708 done
709 done
710 done
711 done
713 # If the assembler supports gnu_indirect_function symbol type and the
714 # architecture supports multi-arch, we enable multi-arch by default.
715 case $sysnames_add_ons$sysnames in
716 *"$multi_arch_d"*)
717 ;;
718 *)
719 test x"$multi_arch" = xdefault && multi_arch=no
720 ;;
721 esac
722 if test x"$multi_arch" != xno; then
723 AC_DEFINE(USE_MULTIARCH)
724 fi
725 AC_SUBST(multi_arch)
727 if test -z "$os_used" && test "$os" != none; then
728 AC_MSG_ERROR(Operating system $os is not supported.)
729 fi
730 if test -z "$machine_used" && test "$machine" != none; then
731 AC_MSG_ERROR(The $machine is not supported.)
732 fi
733 if test -z "$submachine_used" && test -n "$submachine"; then
734 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
735 fi
736 AC_SUBST(submachine)
738 # We have now validated the configuration.
740 # Expand the list of system names into a full list of directories
741 # from each element's parent name and Implies file (if present).
742 set $sysnames
743 names=
744 while test $# -gt 0; do
745 name=$1
746 shift
748 case " $names " in *" $name "*)
749 # Already in the list.
750 continue
751 esac
753 # Report each name as we discover it, so there is no long pause in output.
754 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
756 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
758 case $name in
759 /*) xsrcdir= ;;
760 *) xsrcdir=$srcdir/ ;;
761 esac
762 test -n "$enable_debug_configure" &&
763 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
765 for implies_file in Implies Implies-before Implies-after; do
766 implies_type=`echo $implies_file | sed s/-/_/`
767 eval ${implies_type}=
768 if test -f $xsrcdir$name/$implies_file; then
769 # Collect more names from the `Implies' file (removing comments).
770 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
771 for x in $implied_candidate; do
772 found=no
773 if test -d $xsrcdir$name_base/$x; then
774 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
775 found=yes
776 fi
777 for d in $add_ons_pfx ''; do
778 try="${d}sysdeps/$x"
779 case $d in
780 /*) try_srcdir= ;;
781 *) try_srcdir=$srcdir/ ;;
782 esac
783 test -n "$enable_debug_configure" &&
784 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
785 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
786 then
787 eval "${implies_type}=\"\$${implies_type} \$try\""
788 found=yes
789 case "$sysnames_add_ons" in
790 *" $d "*) ;;
791 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
792 esac
793 fi
794 done
795 if test $found = no; then
796 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
797 fi
798 done
799 fi
800 done
802 # Add NAME to the list of names.
803 names="$names $name"
805 # Find the parent of NAME, using the empty string if it has none.
806 changequote(,)dnl
807 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
808 changequote([,])dnl
810 test -n "$enable_debug_configure" &&
811 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
812 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
814 # Add the names implied by NAME, and NAME's parent (if it has one), to
815 # the list of names to be processed (the argument list). We prepend the
816 # implied names to the list and append the parent. We want implied
817 # directories to come before further directories inferred from the
818 # configuration components; this ensures that for sysv4, unix/common
819 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
820 # after sysv4).
821 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
822 test -n "$sysnames" && set $sysnames
823 done
825 # Add the default directories.
826 default_sysnames="sysdeps/generic"
827 sysnames="$names $default_sysnames"
828 AC_SUBST(sysnames)
829 # The other names were emitted during the scan.
830 AC_MSG_RESULT($default_sysnames)
832 # Collect the list of add-ons that supply partial sysdeps trees.
833 sysdeps_add_ons=
834 for add_on in $add_ons; do
835 case "$add_on" in
836 /*) xsrcdir= ;;
837 *) xsrcdir="$srcdir/" ;;
838 esac
840 test -d "$xsrcdir$add_on/sysdeps" || {
841 case "$configured_add_ons " in
842 *" $add_on "*) ;;
843 *|'')
844 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
845 ;;
846 esac
847 continue
848 }
850 sysdeps_add_ons="$sysdeps_add_ons $add_on"
851 case "$sysnames_add_ons" in
852 *" $add_on/ "*) ;;
853 *|'')
854 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
855 continue ;;
856 esac
858 found=no
859 for d in $sysnames; do
860 case "$d" in
861 $add_on/sysdeps/*) ;;
862 *) continue ;;
863 esac
864 (cd "$xsrcdir$d" && for f in *[[!~]]; do
865 case "$f" in
866 sys|bits)
867 for ff in $f/*.h; do
868 test -d "$ff" || { test -e "$ff" && exit 88; }
869 done
870 ;;
871 *)
872 test -d "$f" || { test -e "$f" && exit 88; }
873 ;;
874 esac
875 done)
876 if test $? -eq 88; then
877 found=yes
878 break
879 fi
880 done
881 if test $found = no; then
882 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
883 fi
884 done
885 AC_SUBST(sysdeps_add_ons)
888 ### Locate tools.
890 AC_PROG_INSTALL
891 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
892 # The makefiles need to use a different form to find it in $srcdir.
893 INSTALL='\$(..)./scripts/install-sh -c'
894 fi
895 AC_PROG_LN_S
897 LIBC_PROG_BINUTILS
898 AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
900 # Accept binutils 2.20 or newer.
901 AC_CHECK_PROG_VER(AS, $AS, --version,
902 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
903 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
904 AC_CHECK_PROG_VER(LD, $LD, --version,
905 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
906 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
908 # These programs are version sensitive.
909 AC_CHECK_TOOL_PREFIX
910 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
911 [version \([egcygnustpi-]*[0-9.]*\)], [4.[3-9].* | 4.[1-9][0-9].* | [5-9].* ],
912 critic_missing="$critic_missing gcc")
913 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
914 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
915 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
917 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
918 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
919 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
920 MSGFMT=: aux_missing="$aux_missing msgfmt")
921 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
922 [GNU texinfo.* \([0-9][0-9.]*\)],
923 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
924 MAKEINFO=: aux_missing="$aux_missing makeinfo")
925 AC_CHECK_PROG_VER(SED, sed, --version,
926 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
927 [3.0[2-9]*|3.[1-9]*|[4-9]*],
928 SED=: aux_missing="$aux_missing sed")
929 AC_CHECK_PROG_VER(AWK, gawk, --version,
930 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
931 [[3-9].*], critic_missing="$critic_missing gawk")
933 AC_CHECK_TOOL(READELF, readelf, false)
934 AC_CHECK_TOOL(NM, nm, false)
936 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
937 case "x$AUTOCONF" in
938 xno|x|x:) AUTOCONF=no ;;
939 *)
940 AC_CACHE_CHECK(dnl
941 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
942 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
943 libc_cv_autoconf_works=yes
944 else
945 libc_cv_autoconf_works=no
946 fi])
947 test $libc_cv_autoconf_works = yes || AUTOCONF=no
948 ;;
949 esac
950 if test "x$AUTOCONF" = xno; then
951 aux_missing="$aux_missing autoconf"
952 fi
954 test -n "$critic_missing" && AC_MSG_ERROR([
955 *** These critical programs are missing or too old:$critic_missing
956 *** Check the INSTALL file for required versions.])
958 test -n "$aux_missing" && AC_MSG_WARN([
959 *** These auxiliary programs are missing or incompatible versions:$aux_missing
960 *** some features will be disabled.
961 *** Check the INSTALL file for required versions.])
963 # if using special system headers, find out the compiler's sekrit
964 # header directory and add that to the list. NOTE: Only does the right
965 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
966 if test -n "$sysheaders"; then
967 SYSINCLUDES=-nostdinc
968 for d in include include-fixed; do
969 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
970 SYSINCLUDES="$SYSINCLUDES -isystem $i"
971 done
972 SYSINCLUDES="$SYSINCLUDES \
973 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
974 if test -n "$CXX"; then
975 CXX_SYSINCLUDES=
976 cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
977 cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
978 cxxplus=`$CXX -print-prog-name=cc1plus`
979 cxxheaders=`$cxxplus -v /dev/null 2>&1 | sed -n '/ \//{p;q;}' | sed 's/ //'`
980 test "x$cxxheaders" != x && test "x$i" != "x$cxxheaders" &&
981 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders \
982 -isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
983 fi
984 fi
985 AC_SUBST(SYSINCLUDES)
986 AC_SUBST(CXX_SYSINCLUDES)
988 # Test if LD_LIBRARY_PATH contains the notation for the current directory
989 # since this would lead to problems installing/building glibc.
990 # LD_LIBRARY_PATH contains the current directory if one of the following
991 # is true:
992 # - one of the terminals (":" and ";") is the first or last sign
993 # - two terminals occur directly after each other
994 # - the path contains an element with a dot in it
995 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
996 changequote(,)dnl
997 case ${LD_LIBRARY_PATH} in
998 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
999 ld_library_path_setting="contains current directory"
1000 ;;
1001 *)
1002 ld_library_path_setting="ok"
1003 ;;
1004 esac
1005 changequote([,])dnl
1006 AC_MSG_RESULT($ld_library_path_setting)
1007 if test "$ld_library_path_setting" != "ok"; then
1008 AC_MSG_ERROR([
1009 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1010 *** building glibc. Please change the environment variable
1011 *** and run configure again.])
1012 fi
1014 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1015 if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
1016 libc_cv_gcc_static_libgcc=
1017 else
1018 libc_cv_gcc_static_libgcc=-static-libgcc
1019 fi])
1020 AC_SUBST(libc_cv_gcc_static_libgcc)
1022 AC_PATH_PROG(BASH_SHELL, bash, no)
1023 if test "$BASH_SHELL" != no &&
1024 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1025 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1026 libc_cv_have_bash2=yes
1027 else
1028 libc_cv_have_bash2=no
1029 fi
1030 AC_SUBST(libc_cv_have_bash2)
1032 dnl We need a ksh compatible shell for tzselect.
1033 if test "$BASH_SHELL" = no; then
1034 AC_PATH_PROG(KSH, ksh, no)
1035 if test "$KSH" = no; then
1036 libc_cv_have_ksh=no
1037 else
1038 libc_cv_have_ksh=yes
1039 fi
1040 else
1041 KSH="$BASH_SHELL"
1042 AC_SUBST(KSH)
1043 libc_cv_have_ksh=yes
1044 fi
1045 AC_SUBST(libc_cv_have_ksh)
1047 AC_PATH_PROG(PERL, perl, no)
1048 if test "$PERL" != no &&
1049 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1050 PERL=no
1051 fi
1052 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1053 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1054 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1056 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1057 AC_TRY_COMPILE(dnl
1058 [#define __need_size_t
1059 #define __need_wchar_t
1060 #include <stddef.h>
1061 #define __need_NULL
1062 #include <stddef.h>], [size_t size; wchar_t wchar;
1063 #ifdef offsetof
1064 #error stddef.h ignored __need_*
1065 #endif
1066 if (&size == NULL || &wchar == NULL) abort ();],
1067 libc_cv_friendly_stddef=yes,
1068 libc_cv_friendly_stddef=no)])
1069 if test $libc_cv_friendly_stddef = yes; then
1070 config_vars="$config_vars
1071 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1072 fi
1074 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1075 libc_cv_need_minus_P, [dnl
1076 cat > conftest.S <<EOF
1077 #include "confdefs.h"
1078 /* Nothing whatsoever. */
1079 EOF
1080 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1081 libc_cv_need_minus_P=no
1082 else
1083 libc_cv_need_minus_P=yes
1084 fi
1085 rm -f conftest*])
1086 if test $libc_cv_need_minus_P = yes; then
1087 config_vars="$config_vars
1088 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1089 fi
1091 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1092 cat > conftest.s <<EOF
1093 ${libc_cv_dot_text}
1094 foo:
1095 .set glibc_conftest_frobozz,foo
1096 .globl glibc_conftest_frobozz
1097 EOF
1098 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1099 # (but it doesn't work), so we must do a linking check to be sure.
1100 cat > conftest1.c <<\EOF
1101 extern int glibc_conftest_frobozz;
1102 void _start() { glibc_conftest_frobozz = 1; }
1103 EOF
1104 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1105 -nostartfiles -nostdlib \
1106 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1107 libc_cv_asm_set_directive=yes
1108 else
1109 libc_cv_asm_set_directive=no
1110 fi
1111 rm -f conftest*])
1112 if test $libc_cv_asm_set_directive = yes; then
1113 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1114 fi
1116 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1117 libc_cv_asm_unique_object, [dnl
1118 cat > conftest.s <<EOF
1119 ${libc_cv_dot_text}
1120 _sym:
1121 .type _sym, %gnu_unique_object
1122 EOF
1123 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1124 libc_cv_asm_unique_object=yes
1125 else
1126 libc_cv_asm_unique_object=no
1127 fi
1128 rm -f conftest*])
1129 if test $libc_cv_asm_unique_object = yes; then
1130 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1131 fi
1133 AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
1134 [cat > conftest.s <<EOF
1135 ${libc_cv_dot_text}
1136 _sym:
1137 .symver _sym,sym@VERS
1138 EOF
1139 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1140 libc_cv_asm_symver_directive=yes
1141 else
1142 libc_cv_asm_symver_directive=no
1143 fi
1144 rm -f conftest*])
1145 AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
1146 if test $libc_cv_asm_symver_directive = yes; then
1147 cat > conftest.s <<EOF
1148 ${libc_cv_dot_text}
1149 _sym:
1150 .symver _sym,sym@VERS
1151 EOF
1152 cat > conftest.map <<EOF
1153 VERS_1 {
1154 global: sym;
1155 };
1157 VERS_2 {
1158 global: sym;
1159 } VERS_1;
1160 EOF
1161 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1162 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
1163 -o conftest.so conftest.o
1164 -nostartfiles -nostdlib
1165 -Wl,--version-script,conftest.map
1166 1>&AS_MESSAGE_LOG_FD]);
1167 then
1168 libc_cv_ld_version_script_option=yes
1169 else
1170 libc_cv_ld_version_script_option=no
1171 fi
1172 else
1173 libc_cv_ld_version_script_option=no
1174 fi
1175 else
1176 libc_cv_ld_version_script_option=no
1177 fi
1178 rm -f conftest*])
1179 if test $shared != no &&
1180 test $libc_cv_asm_symver_directive = yes &&
1181 test $libc_cv_ld_version_script_option = yes &&
1182 test $enable_versioning = yes; then
1183 VERSIONING=yes
1184 AC_DEFINE(DO_VERSIONING)
1185 else
1186 VERSIONING=no
1187 fi
1188 AC_SUBST(VERSIONING)
1190 if test $shared != no && test $VERSIONING = no; then
1191 echo "\
1192 *** WARNING: You should not compile GNU libc without versioning. Not using
1193 *** versioning will introduce incompatibilities so that old binaries
1194 *** will not run anymore.
1195 *** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
1196 fi
1197 AC_CACHE_CHECK(for .previous assembler directive,
1198 libc_cv_asm_previous_directive, [dnl
1199 cat > conftest.s <<EOF
1200 .section foo_section
1201 .previous
1202 EOF
1203 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1204 libc_cv_asm_previous_directive=yes
1205 else
1206 libc_cv_asm_previous_directive=no
1207 fi
1208 rm -f conftest*])
1209 if test $libc_cv_asm_previous_directive = yes; then
1210 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1211 else
1212 AC_CACHE_CHECK(for .popsection assembler directive,
1213 libc_cv_asm_popsection_directive, [dnl
1214 cat > conftest.s <<EOF
1215 .pushsection foo_section
1216 .popsection
1217 EOF
1218 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1219 libc_cv_asm_popsection_directive=yes
1220 else
1221 libc_cv_asm_popsection_directive=no
1222 fi
1223 rm -f conftest*])
1224 if test $libc_cv_asm_popsection_directive = yes; then
1225 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1226 fi
1227 fi
1228 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1229 libc_cv_asm_protected_directive, [dnl
1230 cat > conftest.s <<EOF
1231 .protected foo
1232 foo:
1233 .hidden bar
1234 bar:
1235 EOF
1236 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1237 libc_cv_asm_protected_directive=yes
1238 else
1239 AC_MSG_ERROR(assembler support for symbol visibility is required)
1240 fi
1241 rm -f conftest*])
1243 if test $libc_cv_asm_protected_directive = yes; then
1244 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1245 libc_cv_visibility_attribute,
1246 [cat > conftest.c <<EOF
1247 int foo __attribute__ ((visibility ("hidden"))) = 1;
1248 int bar __attribute__ ((visibility ("protected"))) = 1;
1249 EOF
1250 libc_cv_visibility_attribute=no
1251 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1252 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1253 if grep '\.protected.*bar' conftest.s >/dev/null; then
1254 libc_cv_visibility_attribute=yes
1255 fi
1256 fi
1257 fi
1258 rm -f conftest.{c,s}
1259 ])
1260 if test $libc_cv_visibility_attribute != yes; then
1261 AC_MSG_ERROR(compiler support for visibility attribute is required)
1262 fi
1263 fi
1265 if test $libc_cv_visibility_attribute = yes; then
1266 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1267 libc_cv_broken_visibility_attribute,
1268 [cat > conftest.c <<EOF
1269 int foo (int x);
1270 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1271 int bar (int x) { return x; }
1272 EOF
1273 libc_cv_broken_visibility_attribute=yes
1274 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1275 changequote(,)dnl
1276 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1277 changequote([,])dnl
1278 libc_cv_broken_visibility_attribute=no
1279 fi
1280 fi
1281 rm -f conftest.c conftest.s
1282 ])
1283 if test $libc_cv_broken_visibility_attribute = yes; then
1284 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1285 fi
1286 fi
1288 AC_CACHE_CHECK(for broken __attribute__((alias())),
1289 libc_cv_broken_alias_attribute,
1290 [cat > conftest.c <<EOF
1291 extern int foo (int x) __asm ("xyzzy");
1292 int bar (int x) { return x; }
1293 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1294 extern int dfoo;
1295 extern __typeof (dfoo) dfoo __asm ("abccb");
1296 int dfoo = 1;
1297 EOF
1298 libc_cv_broken_alias_attribute=yes
1299 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1300 if grep 'xyzzy' conftest.s >/dev/null &&
1301 grep 'abccb' conftest.s >/dev/null; then
1302 libc_cv_broken_alias_attribute=no
1303 fi
1304 fi
1305 rm -f conftest.c conftest.s
1306 ])
1307 if test $libc_cv_broken_alias_attribute = yes; then
1308 AC_MSG_ERROR(working alias attribute support required)
1309 fi
1311 if test $libc_cv_visibility_attribute = yes; then
1312 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1313 libc_cv_have_sdata_section,
1314 [echo "int i;" > conftest.c
1315 libc_cv_have_sdata_section=no
1316 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1317 | grep '\.sdata' >/dev/null; then
1318 libc_cv_have_sdata_section=yes
1319 fi
1320 rm -f conftest.c conftest.so
1321 ])
1322 if test $libc_cv_have_sdata_section = yes; then
1323 AC_DEFINE(HAVE_SDATA_SECTION)
1324 fi
1325 fi
1327 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1328 libc_cv_initfini_array, [dnl
1329 LIBC_TRY_LINK_STATIC([
1330 int foo (void) { return 1; }
1331 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1332 ],
1333 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1334 libc_cv_initfini_array=yes
1335 else
1336 libc_cv_initfini_array=no
1337 fi],
1338 [libc_cv_initfini_array=no])
1339 ])
1340 if test $libc_cv_initfini_array != yes; then
1341 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1342 fi
1344 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1345 libc_cv_ctors_header, [dnl
1346 libc_cv_ctors_header=yes
1347 LIBC_TRY_LINK_STATIC([
1348 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1349 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1350 ],
1351 [dnl
1352 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1353 { gsub(/\@<:@ */, "@<:@") }
1354 $2 == ".ctors" || $2 == ".dtors" {
1355 size = strtonum("0x" $6)
1356 align = strtonum("0x" $NF)
1357 seen@<:@$2@:>@ = 1
1358 stub@<:@$2@:>@ = size == align * 2
1359 }
1360 END {
1361 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1362 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1363 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1364 }
1365 '], [libc_cv_ctors_header=no])
1366 ], [dnl
1367 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1368 ])
1369 ])
1370 if test $libc_cv_ctors_header = no; then
1371 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1372 fi
1374 AC_CACHE_CHECK(for libunwind-support in compiler,
1375 libc_cv_cc_with_libunwind, [
1376 cat > conftest.c <<EOF
1377 int main (void) { return 0; }
1378 EOF
1379 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1380 conftest.c -v 2>&1 >/dev/null | grep -q " -lunwind "; then
1381 libc_cv_cc_with_libunwind=yes
1382 else
1383 libc_cv_cc_with_libunwind=no
1384 fi
1385 rm -f conftest*])
1386 AC_SUBST(libc_cv_cc_with_libunwind)
1387 if test $libc_cv_cc_with_libunwind = yes; then
1388 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1389 fi
1391 AC_CACHE_CHECK(for -z nodelete option,
1392 libc_cv_z_nodelete, [dnl
1393 cat > conftest.c <<EOF
1394 int _start (void) { return 42; }
1395 EOF
1396 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1397 -fPIC -shared -o conftest.so conftest.c
1398 -nostartfiles -nostdlib
1399 -Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
1400 then
1401 libc_cv_z_nodelete=yes
1402 else
1403 AC_MSG_ERROR(linker with -z nodelete support required)
1404 fi
1405 rm -f conftest*])
1407 AC_CACHE_CHECK(for -z nodlopen option,
1408 libc_cv_z_nodlopen, [dnl
1409 cat > conftest.c <<EOF
1410 int _start (void) { return 42; }
1411 EOF
1412 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1413 -fPIC -shared -o conftest.so conftest.c
1414 -nostartfiles -nostdlib
1415 -Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
1416 then
1417 libc_cv_z_nodlopen=yes
1418 else
1419 AC_MSG_ERROR(linker with -z nodlopen support required)
1420 fi
1421 rm -f conftest*])
1423 AC_CACHE_CHECK(for -z initfirst option,
1424 libc_cv_z_initfirst, [dnl
1425 cat > conftest.c <<EOF
1426 int _start (void) { return 42; }
1427 EOF
1428 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1429 -fPIC -shared -o conftest.so conftest.c
1430 -nostartfiles -nostdlib
1431 -Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
1432 then
1433 libc_cv_z_initfirst=yes
1434 else
1435 AC_MSG_ERROR(linker with -z initfirst support required)
1436 fi
1437 rm -f conftest*])
1439 # Add-on fragments can set these for other machines.
1440 libc_commonpagesize=${libc_commonpagesize:-no}
1441 libc_relro_required=${libc_relro_required:-no}
1442 case "$base_machine" in
1443 i[[34567]]86 | x86_64 | powerpc* | s390*)
1444 libc_commonpagesize=0x1000
1445 libc_relro_required=yes
1446 ;;
1447 sparc*)
1448 libc_commonpagesize=0x2000
1449 libc_relro_required=yes
1450 ;;
1451 esac
1453 if test $libc_commonpagesize != no; then
1454 AC_CACHE_CHECK(for -z relro option,
1455 libc_cv_z_relro, [dnl
1456 libc_cv_z_relro=no
1457 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1458 int _start (void) { return 42; }
1459 extern void _exit (int);
1460 /* Since these pointers are const, they should go in rodata.
1461 Since they refer to functions that have to be resolved by
1462 dynamic linking, they should instead go in RELRO data. */
1463 const void *const relro[] = { &_start, &_exit, 0 };
1464 /* GNU ld fails to produce RELRO data when it's very small and there is no
1465 normal writable data following it, or if only uninitialized (.bss) data
1466 follows it, or only very small writable data. */
1467 int data[0x10000] = { 1, };
1468 ]])])
1469 cat > conftest.awk <<\EOF
1470 BEGIN {
1471 result = "no"
1472 commonpagesize = strtonum(commonpagesize)
1473 }
1474 { print "LINE:", $0 > "/dev/stderr" }
1475 $1 == "GNU_RELRO" {
1476 vaddr = strtonum($3)
1477 memsz = strtonum($6)
1478 end = vaddr + memsz
1479 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1480 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1481 result = (end % commonpagesize == 0) ? "yes" : "broken"
1482 }
1483 END { print result }
1484 EOF
1485 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1486 -fPIC -shared -o conftest.so conftest.c
1487 -nostartfiles -nostdlib
1488 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1489 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1490 AC_TRY_COMMAND([
1491 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1492 conftest.ph > conftest.cps
1493 ]) &&
1494 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1495 rm -f conftest*])
1496 if { test "x$libc_relro_required" = xyes &&
1497 test "x$libc_cv_z_relro" != xyes
1498 }
1499 then
1500 AC_MSG_ERROR(linker with -z relro support required)
1501 fi
1502 else
1503 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1504 fi
1506 AC_CACHE_CHECK(for -Bgroup option,
1507 libc_cv_Bgroup, [dnl
1508 cat > conftest.c <<EOF
1509 int _start (void) { return 42; }
1510 EOF
1511 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1512 -fPIC -shared -o conftest.so conftest.c
1513 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1514 then
1515 libc_cv_Bgroup=yes
1516 else
1517 libc_cv_Bgroup=no
1518 fi
1519 rm -f conftest*])
1520 AC_SUBST(libc_cv_Bgroup)
1522 ASFLAGS_config=
1523 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1524 libc_cv_as_noexecstack, [dnl
1525 cat > conftest.c <<EOF
1526 void foo (void) { }
1527 EOF
1528 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1529 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1530 && grep -q .note.GNU-stack conftest.s \
1531 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1532 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1533 then
1534 libc_cv_as_noexecstack=yes
1535 else
1536 libc_cv_as_noexecstack=no
1537 fi
1538 rm -f conftest*])
1539 if test $libc_cv_as_noexecstack = yes; then
1540 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1541 fi
1542 AC_SUBST(ASFLAGS_config)
1544 AC_CACHE_CHECK(for -z combreloc,
1545 libc_cv_z_combreloc, [dnl
1546 cat > conftest.c <<EOF
1547 extern int bar (int);
1548 extern int mumble;
1549 int foo (void) { return bar (mumble); }
1550 EOF
1551 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1552 -fPIC -shared -o conftest.so conftest.c
1553 -nostdlib -nostartfiles
1554 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1555 then
1556 dnl The following test is a bit weak. We must use a tool which can test
1557 dnl cross-platform since the gcc used can be a cross compiler. Without
1558 dnl introducing new options this is not easily doable. Instead use a tool
1559 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1560 dnl look for a section named .rel.dyn.
1561 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1562 libc_cv_z_combreloc=yes
1563 else
1564 libc_cv_z_combreloc=no
1565 fi
1566 else
1567 libc_cv_z_combreloc=no
1568 fi
1569 rm -f conftest*])
1570 if test "$libc_cv_z_combreloc" = yes; then
1571 AC_DEFINE(HAVE_Z_COMBRELOC)
1572 fi
1573 AC_SUBST(libc_cv_z_combreloc)
1575 AC_CACHE_CHECK(for -z execstack,
1576 libc_cv_z_execstack, [dnl
1577 cat > conftest.c <<EOF
1578 int _start (void) { return 42; }
1579 EOF
1580 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1581 -fPIC -shared -o conftest.so conftest.c
1582 -Wl,-z,execstack -nostdlib
1583 1>&AS_MESSAGE_LOG_FD])
1584 then
1585 libc_cv_z_execstack=yes
1586 else
1587 libc_cv_z_execstack=no
1588 fi
1589 rm -f conftest*])
1590 AC_SUBST(libc_cv_z_execstack)
1592 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1593 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1594 ])
1596 AC_SUBST(libc_cv_fpie)
1598 AC_CACHE_CHECK(for --hash-style option,
1599 libc_cv_hashstyle, [dnl
1600 cat > conftest.c <<EOF
1601 int _start (void) { return 42; }
1602 EOF
1603 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1604 -fPIC -shared -o conftest.so conftest.c
1605 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1606 then
1607 libc_cv_hashstyle=yes
1608 else
1609 libc_cv_hashstyle=no
1610 fi
1611 rm -f conftest*])
1612 AC_SUBST(libc_cv_hashstyle)
1614 # The linker's default -shared behavior is good enough if it
1615 # does these things that our custom linker scripts ensure that
1616 # all allocated NOTE sections come first.
1617 if test "$use_default_link" = default; then
1618 AC_CACHE_CHECK([for sufficient default -shared layout],
1619 libc_cv_use_default_link, [dnl
1620 libc_cv_use_default_link=no
1621 cat > conftest.s <<\EOF
1622 .section .note.a,"a",%note
1623 .balign 4
1624 .long 4,4,9
1625 .string "GNU"
1626 .string "foo"
1627 .section .note.b,"a",%note
1628 .balign 4
1629 .long 4,4,9
1630 .string "GNU"
1631 .string "bar"
1632 EOF
1633 if AC_TRY_COMMAND([dnl
1634 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1635 ac_try=`$READELF -S conftest.so | sed -n \
1636 ['${x;p;}
1637 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1638 t a
1639 b
1640 : a
1641 H']`
1642 then
1643 libc_seen_a=no libc_seen_b=no
1644 set -- $ac_try
1645 while test $# -ge 2 -a "$1" = NOTE; do
1646 case "$2" in
1647 .note.a) libc_seen_a=yes ;;
1648 .note.b) libc_seen_b=yes ;;
1649 esac
1650 shift 2
1651 done
1652 case "$libc_seen_a$libc_seen_b" in
1653 yesyes)
1654 libc_cv_use_default_link=yes
1655 ;;
1656 *)
1657 echo >&AS_MESSAGE_LOG_FD "\
1658 $libc_seen_a$libc_seen_b from:
1659 $ac_try"
1660 ;;
1661 esac
1662 fi
1663 rm -f conftest*])
1664 use_default_link=$libc_cv_use_default_link
1665 fi
1667 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1668 if libc_cv_output_format=`
1669 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1670 then
1671 :
1672 else
1673 libc_cv_output_format=
1674 fi
1675 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1676 AC_SUBST(libc_cv_output_format)
1678 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1679 cat > conftest.c <<EOF
1680 int foo;
1681 EOF
1682 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1683 conftest.c 1>&AS_MESSAGE_LOG_FD])
1684 then
1685 libc_cv_fno_toplevel_reorder=yes
1686 else
1687 libc_cv_fno_toplevel_reorder=no
1688 fi
1689 rm -f conftest*])
1690 if test $libc_cv_fno_toplevel_reorder = yes; then
1691 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1692 else
1693 fno_unit_at_a_time=-fno-unit-at-a-time
1694 fi
1695 AC_SUBST(fno_unit_at_a_time)
1697 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1698 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1699 [libc_cv_ssp=yes],
1700 [libc_cv_ssp=no])
1701 ])
1702 AC_SUBST(libc_cv_ssp)
1704 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1705 cat > conftest.c <<EOF
1706 int foo;
1707 #ifdef __GNUC_GNU_INLINE__
1708 main () { return 0;}
1709 #else
1710 #error
1711 #endif
1712 EOF
1713 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1714 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1715 then
1716 libc_cv_gnu89_inline=yes
1717 else
1718 libc_cv_gnu89_inline=no
1719 fi
1720 rm -f conftest*])
1721 if test $libc_cv_gnu89_inline = yes; then
1722 gnu89_inline=-fgnu89-inline
1723 else
1724 gnu89_inline=
1725 fi
1726 AC_SUBST(gnu89_inline)
1728 AC_CACHE_CHECK(whether cc puts quotes around section names,
1729 libc_cv_have_section_quotes,
1730 [cat > conftest.c <<EOF
1731 static const int foo
1732 __attribute__ ((section ("bar"))) = 1;
1733 EOF
1734 if ${CC-cc} -S conftest.c -o conftest.s; then
1735 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1736 libc_cv_have_section_quotes=yes
1737 else
1738 libc_cv_have_section_quotes=no
1739 fi
1740 else
1741 libc_cv_have_section_quotes=unknown
1742 fi
1743 rm -f conftest.{c,s}
1744 ])
1745 if test $libc_cv_have_section_quotes = yes; then
1746 AC_DEFINE(HAVE_SECTION_QUOTES)
1747 fi
1749 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1750 [dnl
1751 cat > conftest.s <<EOF
1752 ${libc_cv_dot_text}
1753 .globl foo
1754 foo:
1755 .weak foo
1756 .weak bar; bar = foo
1757 EOF
1758 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1759 libc_cv_asm_weak_directive=yes
1760 else
1761 libc_cv_asm_weak_directive=no
1762 fi
1763 rm -f conftest*])
1765 if test $libc_cv_asm_weak_directive = no; then
1766 AC_CACHE_CHECK(for assembler .weakext directive,
1767 libc_cv_asm_weakext_directive,
1768 [dnl
1769 cat > conftest.s <<EOF
1770 ${libc_cv_dot_text}
1771 .globl foo
1772 foo:
1773 .weakext bar foo
1774 .weakext baz
1775 .globl baz
1776 baz:
1777 EOF
1778 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1779 libc_cv_asm_weakext_directive=yes
1780 else
1781 libc_cv_asm_weakext_directive=no
1782 fi
1783 rm -f conftest*])
1785 fi # no .weak
1787 if test $libc_cv_asm_weak_directive = yes; then
1788 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1789 elif test $libc_cv_asm_weakext_directive = yes; then
1790 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1791 fi
1793 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1794 case $machine in
1795 sparc/sparc64*) cfi_offset=2047;;
1796 *) cfi_offset=0;;
1797 esac
1798 cat > conftest.s <<EOF
1799 .text
1800 .type func,%function
1801 func:
1802 .cfi_startproc
1803 .cfi_remember_state
1804 .cfi_rel_offset 1, $cfi_offset
1805 .cfi_endproc
1806 EOF
1807 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1808 libc_cv_asm_cfi_directives=yes
1809 else
1810 libc_cv_asm_cfi_directives=no
1811 fi
1812 rm -f conftest*])
1813 if test $libc_cv_asm_cfi_directives = yes; then
1814 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1815 fi
1817 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1818 cat > conftest.c <<\EOF
1819 _start () {}
1820 int __eh_pc;
1821 __throw () {}
1822 EOF
1823 dnl No \ in command here because it ends up inside ''.
1824 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1825 -nostdlib -nostartfiles -Wl,--no-whole-archive
1826 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1827 libc_cv_ld_no_whole_archive=yes
1828 else
1829 libc_cv_ld_no_whole_archive=no
1830 fi
1831 rm -f conftest*])
1832 if test $libc_cv_ld_no_whole_archive = no; then
1833 AC_MSG_ERROR([support for --no-whole-archive is needed])
1834 fi
1836 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1837 cat > conftest.c <<\EOF
1838 _start () {}
1839 int __eh_pc;
1840 __throw () {}
1841 EOF
1842 dnl No \ in command here because it ends up inside ''.
1843 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1844 -nostdlib -nostartfiles -fexceptions
1845 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1846 libc_cv_gcc_exceptions=yes
1847 else
1848 libc_cv_gcc_exceptions=no
1849 fi
1850 rm -f conftest*])
1851 if test $libc_cv_gcc_exceptions = yes; then
1852 exceptions=-fexceptions
1853 fi
1854 AC_SUBST(exceptions)dnl
1856 if test "$host_cpu" = powerpc ; then
1857 # Check for a bug present in at least versions 2.8.x of GCC
1858 # and versions 1.0.x of EGCS.
1859 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1860 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1861 libc_cv_c_asmcr0_bug='no',
1862 libc_cv_c_asmcr0_bug='yes')])
1863 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1864 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1865 fi
1866 fi
1868 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1869 cat > conftest.c <<\EOF
1870 void zero (void *x)
1871 {
1872 __builtin_memset (x, 0, 1000);
1873 }
1874 EOF
1875 dnl
1876 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1877 then
1878 libc_cv_gcc_builtin_memset=no
1879 else
1880 libc_cv_gcc_builtin_memset=yes
1881 fi
1882 rm -f conftest* ])
1883 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1884 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1885 fi
1887 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1888 cat > conftest.c <<\EOF
1889 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1890 char *foo (const char *a, const char *b)
1891 {
1892 return __builtin_strstr (a, b);
1893 }
1894 EOF
1895 dnl
1896 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1897 then
1898 libc_cv_gcc_builtin_redirection=yes
1899 else
1900 libc_cv_gcc_builtin_redirection=no
1901 fi
1902 rm -f conftest* ])
1903 if test "$libc_cv_gcc_builtin_redirection" = no; then
1904 AC_MSG_ERROR([support for the symbol redirection needed])
1905 fi
1907 dnl Check whether the compiler supports the __thread keyword.
1908 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1909 [cat > conftest.c <<\EOF
1910 __thread int a = 42;
1911 EOF
1912 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1913 libc_cv_gcc___thread=yes
1914 else
1915 libc_cv_gcc___thread=no
1916 fi
1917 rm -f conftest*])
1918 if test "$libc_cv_gcc___thread" = no; then
1919 AC_MSG_ERROR([support for the __thread keyword is required])
1920 fi
1922 dnl Check whether the compiler supports the tls_model attribute.
1923 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1924 cat > conftest.c <<\EOF
1925 extern __thread int a __attribute__((tls_model ("initial-exec")));
1926 EOF
1927 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1928 libc_cv_gcc_tls_model_attr=yes
1929 else
1930 libc_cv_gcc_tls_model_attr=no
1931 fi
1932 rm -f conftest*])
1933 if test "$libc_cv_gcc_tls_model_attr" = no; then
1934 AC_MSG_ERROR([support for the tls_model attribute is required])
1935 fi
1937 dnl Determine how to disable generation of FMA instructions.
1938 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1939 libc_cv_cc_nofma, [dnl
1940 libc_cv_cc_nofma=
1941 for opt in -ffp-contract=off -mno-fused-madd; do
1942 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1943 done])
1945 if test -n "$submachine"; then
1946 AC_CACHE_CHECK([for compiler option for CPU variant],
1947 libc_cv_cc_submachine, [dnl
1948 libc_cv_cc_submachine=no
1949 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1950 LIBC_TRY_CC_OPTION([$opt], [
1951 libc_cv_cc_submachine="$opt"
1952 break], [])
1953 done])
1954 if test "x$libc_cv_cc_submachine" = xno; then
1955 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1956 fi
1957 fi
1958 AC_SUBST(libc_cv_cc_submachine)
1960 dnl Check whether we have the gd library available.
1961 AC_MSG_CHECKING(for libgd)
1962 if test "$with_gd" != "no"; then
1963 old_CFLAGS="$CFLAGS"
1964 CFLAGS="$CFLAGS $libgd_include"
1965 old_LDFLAGS="$LDFLAGS"
1966 LDFLAGS="$LDFLAGS $libgd_ldflags"
1967 old_LIBS="$LIBS"
1968 LIBS="$LIBS -lgd -lpng -lz -lm"
1969 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1970 CFLAGS="$old_CFLAGS"
1971 LDFLAGS="$old_LDFLAGS"
1972 LIBS="$old_LIBS"
1973 else
1974 LIBGD=no
1975 fi
1976 AC_MSG_RESULT($LIBGD)
1977 AC_SUBST(LIBGD)
1979 # SELinux detection
1980 if test x$with_selinux = xno ; then
1981 have_selinux=no;
1982 else
1983 # See if we have the SELinux library
1984 AC_CHECK_LIB(selinux, is_selinux_enabled,
1985 have_selinux=yes, have_selinux=no)
1986 # See if we have the SELinux header with the NSCD permissions in it.
1987 if test x$have_selinux = xyes ; then
1988 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1989 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1990 [#ifdef NSCD__SHMEMHOST
1991 return 0;
1992 #else
1993 #error NSCD__SHMEMHOST not defined
1994 #endif],
1995 have_selinux=yes, have_selinux=no)
1996 AC_MSG_RESULT($have_selinux)
1997 fi
1999 if test x$with_selinux = xyes ; then
2000 if test x$have_selinux = xno ; then
2001 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
2002 fi
2003 fi
2004 fi
2005 # Check if we're building with SELinux support.
2006 if test "x$have_selinux" = xyes; then
2007 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
2009 # See if we have the libaudit library
2010 AC_CHECK_LIB(audit, audit_log_user_avc_message,
2011 have_libaudit=yes, have_libaudit=no)
2012 if test "x$have_libaudit" = xyes; then
2013 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
2014 fi
2015 AC_SUBST(have_libaudit)
2017 # See if we have the libcap library
2018 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2019 if test "x$have_libcap" = xyes; then
2020 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2021 fi
2022 AC_SUBST(have_libcap)
2023 fi
2024 AC_SUBST(have_selinux)
2026 dnl check for the size of 'long double'.
2027 AC_CHECK_SIZEOF(long double, 0)
2028 sizeof_long_double=$ac_cv_sizeof_long_double
2029 AC_SUBST(sizeof_long_double)
2031 CPPUNDEFS=
2032 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2033 dnl Since we are building the implementations of the fortified functions here,
2034 dnl having the macro defined interacts very badly.
2035 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2036 [AC_TRY_COMPILE([], [
2037 #ifdef _FORTIFY_SOURCE
2038 # error bogon
2039 #endif],
2040 [libc_cv_predef_fortify_source=no],
2041 [libc_cv_predef_fortify_source=yes])])
2042 if test $libc_cv_predef_fortify_source = yes; then
2043 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2044 fi
2045 AC_SUBST(CPPUNDEFS)
2047 dnl Check for silly hacked compilers inserting -fstack-protector.
2048 dnl This breaks badly for the early startup code we compile, since
2049 dnl the compiled code can refer to a magic machine-dependent location
2050 dnl for the canary value before we have sufficient setup for that to
2051 dnl work. It's also questionable to build all of libc with this flag
2052 dnl even when you're doing that for most applications you build, since
2053 dnl libc's code is so heavily-used and performance-sensitive. If we
2054 dnl ever really want to make that work, it should be enabled explicitly
2055 dnl in the libc build, not inherited from implicit compiler settings.
2056 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2057 libc_cv_predef_stack_protector, [
2058 AC_TRY_COMPILE([extern void foobar (char *);],
2059 [char large_array[2048]; foobar (large_array);], [
2060 libc_undefs=`$NM -u conftest.o |
2061 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2062 2>&AS_MESSAGE_LOG_FD` || {
2063 AC_MSG_ERROR([confusing output from $NM -u])
2064 }
2065 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2066 # On some architectures, there are architecture-specific undefined
2067 # symbols (resolved by the linker), so filter out unknown symbols.
2068 # This will fail to produce the correct result if the compiler
2069 # defaults to -fstack-protector but this produces an undefined symbol
2070 # other than __stack_chk_fail. However, compilers like that have not
2071 # been encountered in practice.
2072 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2073 case "$libc_undefs" in
2074 foobar) libc_cv_predef_stack_protector=no ;;
2075 '__stack_chk_fail
2076 foobar') libc_cv_predef_stack_protector=yes ;;
2077 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2078 esac],
2079 [AC_MSG_ERROR([test compilation failed])])
2080 ])
2081 libc_extra_cflags=
2082 if test $libc_cv_predef_stack_protector = yes; then
2083 libc_extra_cflags=-fno-stack-protector
2084 fi
2085 AC_SUBST(libc_extra_cflags)
2087 ### End of automated tests.
2088 ### Now run sysdeps configure fragments.
2090 # They also can set these variables.
2091 use_ldconfig=no
2092 ldd_rewrite_script=no
2093 libc_cv_sysconfdir=$sysconfdir
2094 libc_cv_localstatedir=$localstatedir
2095 libc_cv_gcc_unwind_find_fde=no
2096 libc_cv_idn=no
2098 # Iterate over all the sysdep directories we will use, running their
2099 # configure fragments.
2100 for dir in $sysnames; do
2101 case $dir in
2102 /*) dest=$dir ;;
2103 *) dest=$srcdir/$dir ;;
2104 esac
2105 if test -r $dest/configure; then
2106 AC_MSG_RESULT(running configure fragment for $dir)
2107 . $dest/configure
2108 fi
2109 done
2111 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2112 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2113 fi
2114 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2116 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2117 # configure fragment can override the value to prevent this AC_DEFINE.
2118 AC_SUBST(use_nscd)
2119 if test "x$use_nscd" != xno; then
2120 AC_DEFINE([USE_NSCD])
2121 fi
2122 if test "x$build_nscd" = xdefault; then
2123 build_nscd=$use_nscd
2124 fi
2126 # Test for old glibc 2.0.x headers so that they can be removed properly
2127 # Search only in includedir.
2128 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2129 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2130 then
2131 old_glibc_headers=yes
2132 else
2133 old_glibc_headers=no
2134 fi
2135 AC_MSG_RESULT($old_glibc_headers)
2136 if test ${old_glibc_headers} = yes; then
2137 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2138 AC_MSG_WARN(*** be removed.)
2139 fi
2140 AC_SUBST(old_glibc_headers)
2142 AC_SUBST(libc_cv_slibdir)
2143 AC_SUBST(libc_cv_localedir)
2144 AC_SUBST(libc_cv_sysconfdir)
2145 AC_SUBST(libc_cv_localstatedir)
2146 AC_SUBST(libc_cv_rootsbindir)
2147 AC_SUBST(libc_cv_forced_unwind)
2149 dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
2150 AC_SUBST(libc_cv_cpp_asm_debuginfo)
2151 AC_SUBST(libc_cv_cc_sse4)
2152 AC_SUBST(libc_cv_cc_avx)
2153 AC_SUBST(libc_cv_cc_sse2avx)
2154 AC_SUBST(libc_cv_cc_novzeroupper)
2155 AC_SUBST(libc_cv_cc_fma4)
2156 AC_SUBST(libc_cv_cc_nofma)
2157 AC_SUBST(libc_cv_as_i686)
2158 AC_SUBST(libc_cv_sparc_as_vis3)
2160 AC_SUBST(use_ldconfig)
2161 AC_SUBST(ldd_rewrite_script)
2163 AC_SUBST(static)
2164 AC_SUBST(shared)
2166 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2167 [libc_cv_pic_default=yes
2168 cat > conftest.c <<EOF
2169 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2170 # error PIC is default.
2171 #endif
2172 EOF
2173 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2174 libc_cv_pic_default=no
2175 fi
2176 rm -f conftest.*])
2177 AC_SUBST(libc_cv_pic_default)
2179 AC_SUBST(profile)
2180 AC_SUBST(static_nss)
2182 AC_SUBST(DEFINES)
2184 dnl See sysdeps/mach/configure.in for this variable.
2185 AC_SUBST(mach_interface_list)
2187 if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
2188 config_makefile=
2189 else
2190 config_makefile=Makefile
2191 fi
2193 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2194 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2195 AC_SUBST(VERSION)
2196 AC_SUBST(RELEASE)
2198 AC_CONFIG_FILES([config.make ${config_makefile}])
2199 AC_CONFIG_COMMANDS([default],[[
2200 case $CONFIG_FILES in *config.make*)
2201 echo "$config_vars" >> config.make;;
2202 esac
2203 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2204 AC_OUTPUT