| blob | f3dd87d9125c7b6e441cafad62acaf73770b2db7 |
1 dnl Process this file with autoconf to produce a configure script.
2 dnl Note we do not use AC_PREREQ here! See aclocal.m4 for what we use instead.
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 ACX_PKGVERSION([GNU libc])
9 ACX_BUGURL([http://www.gnu.org/software/libc/bugs.html])
10 AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
11 [Package description])
12 AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
13 [Bug reporting address])
15 # Glibc should not depend on any header files
16 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
17 [m4_divert_text([DEFAULTS],
18 [ac_includes_default='/* none */'])])
20 # We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
21 # here to work around the Autoconf issue discussed in
22 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
23 AC_DEFUN([AC_PROG_CPP],
24 [AC_REQUIRE([AC_PROG_CC])dnl
25 AC_ARG_VAR([CPP], [C preprocessor])dnl
26 _AC_ARG_VAR_CPPFLAGS()dnl
27 # On Suns, sometimes $CPP names a directory.
28 if test -n "$CPP" && test -d "$CPP"; then
29 CPP=
30 fi
31 if test -z "$CPP"; then
32 CPP="$CC -E"
33 fi
34 AC_SUBST(CPP)dnl
35 ])# AC_PROG_CPP
37 # We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf
38 # issue discussed in
39 # <http://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
40 AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
42 dnl This is here so we can set $subdirs directly based on configure fragments.
43 AC_CONFIG_SUBDIRS()
45 AC_CANONICAL_HOST
47 AC_PROG_CC
48 if test $host != $build; then
49 AC_CHECK_PROGS(BUILD_CC, gcc cc)
50 fi
51 AC_SUBST(cross_compiling)
52 AC_PROG_CPP
53 # We need the C++ compiler only for testing.
54 AC_PROG_CXX
55 AC_CHECK_TOOL(READELF, readelf, false)
57 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
58 AC_MSG_ERROR([you must configure in a separate build directory])
59 fi
61 # This will get text that should go into config.make.
62 config_vars=
64 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
65 AC_ARG_WITH([gd],
66 AC_HELP_STRING([--with-gd=DIR],
67 [find libgd include dir and library with prefix DIR]),
68 [dnl
69 case "$with_gd" in
70 yes|''|no) ;;
71 *) libgd_include="-I$withval/include"
72 libgd_ldflags="-L$withval/lib" ;;
73 esac
74 ])
75 AC_ARG_WITH([gd-include],
76 AC_HELP_STRING([--with-gd-include=DIR],
77 [find libgd include files in DIR]),
78 [dnl
79 case "$with_gd_include" in
80 ''|no) ;;
81 *) libgd_include="-I$withval" ;;
82 esac
83 ])
84 AC_ARG_WITH([gd-lib],
85 AC_HELP_STRING([--with-gd-lib=DIR],
86 [find libgd library files in DIR]),
87 [dnl
88 case "$with_gd_lib" in
89 ''|no) ;;
90 *) libgd_ldflags="-L$withval" ;;
91 esac
92 ])
94 if test -n "$libgd_include"; then
95 config_vars="$config_vars
96 CFLAGS-memusagestat.c = $libgd_include"
97 fi
98 if test -n "$libgd_ldflags"; then
99 config_vars="$config_vars
100 libgd-LDFLAGS = $libgd_ldflags"
101 fi
103 dnl Arguments to specify presence of other packages/features.
104 AC_ARG_WITH([fp],
105 AC_HELP_STRING([--with-fp],
106 [if using floating-point hardware @<:@default=yes@:>@]),
107 [with_fp=$withval],
108 [with_fp=yes])
109 AC_SUBST(with_fp)
110 AC_ARG_WITH([binutils],
111 AC_HELP_STRING([--with-binutils=PATH],
112 [specify location of binutils (as and ld)]),
113 [path_binutils=$withval],
114 [path_binutils=''])
115 AC_ARG_WITH([selinux],
116 AC_HELP_STRING([--with-selinux],
117 [if building with SELinux support]),
118 [with_selinux=$withval],
119 [with_selinux=auto])
121 AC_ARG_WITH([headers],
122 AC_HELP_STRING([--with-headers=PATH],
123 [location of system headers to use
124 (for example /usr/src/linux/include)
125 @<:@default=compiler default@:>@]),
126 [sysheaders=$withval],
127 [sysheaders=''])
128 AC_SUBST(sysheaders)
130 AC_SUBST(use_default_link)
131 AC_ARG_WITH([default-link],
132 AC_HELP_STRING([--with-default-link],
133 [do not use explicit linker scripts]),
134 [use_default_link=$withval],
135 [use_default_link=default])
137 AC_ARG_ENABLE([sanity-checks],
138 AC_HELP_STRING([--disable-sanity-checks],
139 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
140 [enable_sanity=$enableval],
141 [enable_sanity=yes])
143 AC_ARG_ENABLE([shared],
144 AC_HELP_STRING([--enable-shared],
145 [build shared library @<:@default=yes if GNU ld@:>@]),
146 [shared=$enableval],
147 [shared=yes])
148 AC_ARG_ENABLE([profile],
149 AC_HELP_STRING([--enable-profile],
150 [build profiled library @<:@default=no@:>@]),
151 [profile=$enableval],
152 [profile=no])
154 AC_ARG_ENABLE([oldest-abi],
155 AC_HELP_STRING([--enable-oldest-abi=ABI],
156 [configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
157 [oldest_abi=$enableval],
158 [oldest_abi=no])
159 if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
160 oldest_abi=default
161 else
162 AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
163 fi
164 AC_SUBST(oldest_abi)
166 AC_ARG_ENABLE([hardcoded-path-in-tests],
167 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
168 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
169 [hardcoded_path_in_tests=$enableval],
170 [hardcoded_path_in_tests=no])
171 AC_SUBST(hardcoded_path_in_tests)
173 AC_ARG_ENABLE([stackguard-randomization],
174 AC_HELP_STRING([--enable-stackguard-randomization],
175 [initialize __stack_chk_guard canary with a random number at program start]),
176 [enable_stackguard_randomize=$enableval],
177 [enable_stackguard_randomize=no])
178 if test "$enable_stackguard_randomize" = yes; then
179 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
180 fi
182 AC_ARG_ENABLE([lock-elision],
183 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
184 [Enable lock elision for pthread mutexes by default]),
185 [enable_lock_elision=$enableval],
186 [enable_lock_elision=no])
187 if test "$enable_lock_elision" = yes ; then
188 AC_DEFINE(ENABLE_LOCK_ELISION)
189 fi
191 dnl Generic infrastructure for drop-in additions to libc.
192 AC_ARG_ENABLE([add-ons],
193 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
194 [configure and build add-ons in DIR1,DIR2,...
195 search for add-ons if no parameter given]),
196 , [enable_add_ons=yes])
198 AC_ARG_ENABLE([hidden-plt],
199 AC_HELP_STRING([--disable-hidden-plt],
200 [do not hide internal function calls to avoid PLT]),
201 [hidden=$enableval],
202 [hidden=yes])
203 if test "x$hidden" = xno; then
204 AC_DEFINE(NO_HIDDEN)
205 fi
207 AC_ARG_ENABLE([bind-now],
208 AC_HELP_STRING([--enable-bind-now],
209 [disable lazy relocations in DSOs]),
210 [bindnow=$enableval],
211 [bindnow=no])
212 AC_SUBST(bindnow)
214 dnl On some platforms we cannot use dynamic loading. We must provide
215 dnl static NSS modules.
216 AC_ARG_ENABLE([static-nss],
217 AC_HELP_STRING([--enable-static-nss],
218 [build static NSS modules @<:@default=no@:>@]),
219 [static_nss=$enableval],
220 [static_nss=no])
221 dnl Enable static NSS also if we build no shared objects.
222 if test x"$static_nss" = xyes || test x"$shared" = xno; then
223 static_nss=yes
224 AC_DEFINE(DO_STATIC_NSS)
225 fi
227 AC_ARG_ENABLE([force-install],
228 AC_HELP_STRING([--disable-force-install],
229 [don't force installation of files from this package, even if they are older than the installed files]),
230 [force_install=$enableval],
231 [force_install=yes])
232 AC_SUBST(force_install)
234 AC_ARG_ENABLE([maintainer-mode],
235 AC_HELP_STRING([--enable-maintainer-mode],
236 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
237 [maintainer=$enableval],
238 [maintainer=no])
240 dnl On some platforms we allow dropping compatibility with all kernel
241 dnl versions.
242 AC_ARG_ENABLE([kernel],
243 AC_HELP_STRING([--enable-kernel=VERSION],
244 [compile for compatibility with kernel not older than VERSION]),
245 [minimum_kernel=$enableval],
246 [])
247 dnl Prevent unreasonable values.
248 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
249 # Better nothing than this.
250 minimum_kernel=""
251 else
252 if test "$minimum_kernel" = current; then
253 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
254 fi
255 fi
257 dnl For the development we sometimes want gcc to issue even more warnings.
258 dnl This is not the default since many of the extra warnings are not
259 dnl appropriate.
260 AC_ARG_ENABLE([all-warnings],
261 AC_HELP_STRING([--enable-all-warnings],
262 [enable all useful warnings gcc can issue]),
263 [all_warnings=$enableval],
264 [])
265 AC_SUBST(all_warnings)
267 AC_ARG_ENABLE([multi-arch],
268 AC_HELP_STRING([--enable-multi-arch],
269 [enable single DSO with optimizations for multiple architectures]),
270 [multi_arch=$enableval],
271 [multi_arch=default])
273 AC_ARG_ENABLE([nss-crypt],
274 AC_HELP_STRING([--enable-nss-crypt],
275 [enable libcrypt to use nss]),
276 [nss_crypt=$enableval],
277 [nss_crypt=no])
278 if test x$nss_crypt = xyes; then
279 nss_includes=-I$(nss-config --includedir 2>/dev/null)
280 if test $? -ne 0; then
281 AC_MSG_ERROR([cannot find include directory with nss-config])
282 fi
283 old_CFLAGS="$CFLAGS"
284 CFLAGS="$CFLAGS $nss_includes"
285 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
286 #include <hasht.h>
287 #include <nsslowhash.h>
288 void f (void) { NSSLOW_Init (); }])],
289 libc_cv_nss_crypt=yes,
290 AC_MSG_ERROR([
291 cannot find NSS headers with lowlevel hash function interfaces]))
292 old_LIBS="$LIBS"
293 LIBS="$LIBS -lfreebl3"
294 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
295 #include <hasht.h>
296 #include <nsslowhash.h>],
297 [NSSLOW_Init();])],
298 libc_cv_nss_crypt=yes,
299 AC_MSG_ERROR([
300 cannot link program using lowlevel NSS hash functions]))
301 CFLAGS="$old_CFLAGS"
302 LIBS="$old_LIBS"
303 else
304 libc_cv_nss_crypt=no
305 fi
306 AC_SUBST(libc_cv_nss_crypt)
309 AC_ARG_ENABLE([obsolete-rpc],
310 AC_HELP_STRING([--enable-obsolete-rpc],
311 [build and install the obsolete RPC code for link-time usage]),
312 [link_obsolete_rpc=$enableval],
313 [link_obsolete_rpc=no])
314 AC_SUBST(link_obsolete_rpc)
316 if test "$link_obsolete_rpc" = yes; then
317 AC_DEFINE(LINK_OBSOLETE_RPC)
318 fi
320 AC_ARG_ENABLE([systemtap],
321 [AS_HELP_STRING([--enable-systemtap],
322 [enable systemtap static probe points @<:@default=no@:>@])],
323 [systemtap=$enableval],
324 [systemtap=no])
325 if test "x$systemtap" != xno; then
326 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
327 old_CFLAGS="$CFLAGS"
328 CFLAGS="-std=gnu99 $CFLAGS"
329 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
330 void foo (int i, void *p)
331 {
332 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
333 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
334 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
335 CFLAGS="$old_CFLAGS"])
336 if test $libc_cv_sdt = yes; then
337 AC_DEFINE([USE_STAP_PROBE])
338 elif test "x$systemtap" != xauto; then
339 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
340 fi
341 fi
343 AC_ARG_ENABLE([build-nscd],
344 [AS_HELP_STRING([--disable-build-nscd],
345 [disable building and installing the nscd daemon])],
346 [build_nscd=$enableval],
347 [build_nscd=default])
348 AC_SUBST(build_nscd)
350 # Note the use of $use_nscd is near the bottom of the file.
351 AC_ARG_ENABLE([nscd],
352 [AS_HELP_STRING([--disable-nscd],
353 [library functions will not contact the nscd daemon])],
354 [use_nscd=$enableval],
355 [use_nscd=yes])
357 AC_ARG_ENABLE([pt_chown],
358 [AS_HELP_STRING([--enable-pt_chown],
359 [Enable building and installing pt_chown])],
360 [build_pt_chown=$enableval],
361 [build_pt_chown=no])
362 AC_SUBST(build_pt_chown)
363 if test "$build_pt_chown" = yes; then
364 AC_DEFINE(HAVE_PT_CHOWN)
365 fi
367 # The way shlib-versions is used to generate soversions.mk uses a
368 # fairly simplistic model for name recognition that can't distinguish
369 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
370 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
371 # tell. This doesn't get used much beyond that, so it's fairly safe.
372 case "$host_os" in
373 linux*)
374 ;;
375 gnu*)
376 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
377 ;;
378 esac
380 # We keep the original values in `$config_*' and never modify them, so we
381 # can write them unchanged into config.make. Everything else uses
382 # $machine, $vendor, and $os, and changes them whenever convenient.
383 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
385 # Don't allow vendor == "unknown"
386 test "$config_vendor" = unknown && config_vendor=
387 config_os="`echo $config_os | sed 's/^unknown-//'`"
389 # Some configurations imply other options.
390 elf=yes
392 # The configure fragment of an add-on port can modify these to supplement
393 # or override the table in the case statement below. No fragment should
394 # ever change the config_* variables, however.
395 machine=$config_machine
396 vendor=$config_vendor
397 os=$config_os
398 base_os=''
400 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
401 # Unify this here.
402 if test "$machine" = rs6000; then
403 machine="powerpc"
404 fi
406 # Braindead PowerPC box with absolutely no FPU.
407 case "$machine-$host_os" in
408 powerpc*-*soft)
409 with_fp=no
410 ;;
411 esac
413 submachine=
414 AC_ARG_WITH([cpu],
415 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
416 [dnl
417 case "$withval" in
418 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
419 no) ;;
420 *) submachine="$withval" ;;
421 esac
422 ])
424 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
425 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
427 # An add-on can set this when it wants to disable the sanity check below.
428 libc_config_ok=no
430 dnl Having this here, though empty, makes sure that if add-ons' fragments
431 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
432 dnl our AC_OUTPUT will actually use it.
433 AC_CONFIG_SUBDIRS()
435 case "$enable_add_ons" in
436 ''|no) add_ons= ;;
437 yes|'*')
438 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
439 sed 's@/[[^/]]*$@@' | sort | uniq`
440 add_ons_automatic=yes
441 ;;
442 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
443 add_ons_automatic=no ;;
444 esac
446 configured_add_ons=
447 add_ons_sfx=
448 add_ons_pfx=
449 if test x"$add_ons" != x; then
450 for f in $add_ons; do
451 # Some sanity checks
452 case "$f" in
453 crypt)
454 AC_MSG_ERROR([
455 *** It seems that you're using an old \`crypt' add-on. crypt is now
456 *** part of glibc and using the old add-on will not work with this
457 *** release. Start again with fresh sources and without the old
458 *** \`crypt' add-on.])
459 ;;
460 localedata)
461 AC_MSG_ERROR([
462 *** It seems that you're using an old \`localedata' add-on. localedata
463 *** is now part of glibc and using the old add-on will not work with
464 *** this release. Start again with fresh sources and without the old
465 *** \`localedata' add-on.])
466 ;;
467 esac
468 done
470 # Now source each add-on's configure fragment.
471 # The fragments can use $srcdir/$libc_add_on to find themselves,
472 # and test $add_ons_automatic to see if they were explicitly requested.
473 # A fragment can clear (or even change) $libc_add_on to affect
474 # whether it goes into the list to be actually used in the build.
475 use_add_ons=
476 for libc_add_on in $add_ons; do
477 # Test whether such a directory really exists.
478 # It can be absolute, or relative to $srcdir, or relative to the build dir.
479 case "$libc_add_on" in
480 /*)
481 libc_add_on_srcdir=$libc_add_on
482 ;;
483 *)
484 test -d "$srcdir/$libc_add_on" || {
485 if test -d "$libc_add_on"; then
486 libc_add_on="`pwd`/$libc_add_on"
487 else
488 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
489 fi
490 }
491 libc_add_on_srcdir=$srcdir/$libc_add_on
492 ;;
493 esac
495 libc_add_on_frag=$libc_add_on_srcdir/configure
496 libc_add_on_canonical=
497 libc_add_on_config_subdirs=
498 if test -r "$libc_add_on_frag"; then
499 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
500 libc_add_on_canonical=unknown
501 libc_add_on_subdirs=
502 . "$libc_add_on_frag"
503 test -z "$libc_add_on" || {
504 configured_add_ons="$configured_add_ons $libc_add_on"
505 if test "x$libc_add_on_canonical" = xunknown; then
506 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
507 fi
508 for d in $libc_add_on_subdirs; do
509 case "$libc_add_on" in
510 /*) subdir_srcdir="$libc_add_on" ;;
511 *) subdir_srcdir="\$(..)$libc_add_on" ;;
512 esac
513 case "$d" in
514 .)
515 d="${libc_add_on_canonical:-$libc_add_on}"
516 ;;
517 /*)
518 subdir_srcdir="$d"
519 ;;
520 *)
521 subdir_srcdir="$subdir_srcdir/$d"
522 ;;
523 esac
524 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
525 add_on_subdirs="$add_on_subdirs $d"
526 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
527 $d-srcdir = $subdir_srcdir"
528 done
529 for d in $libc_add_on_config_subdirs; do
530 case "$d" in
531 /*) AC_MSG_ERROR(dnl
532 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
533 esac
534 if test ! -d "$libc_add_on_srcdir/$d"; then
535 AC_MSG_ERROR(fragment wants to configure missing directory $d)
536 fi
537 case "$libc_add_on" in
538 /*) AC_MSG_ERROR(dnl
539 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
540 esac
541 subdirs="$subdirs $libc_add_on/$d"
542 done
543 }
544 fi
545 if test -n "$libc_add_on"; then
546 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
547 use_add_ons="$use_add_ons $libc_add_on"
548 add_ons_pfx="$add_ons_pfx $libc_add_on/"
549 test -z "$libc_add_on_canonical" ||
550 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
551 fi
552 done
553 # Use echo to strip excess whitespace.
554 add_ons="`echo $use_add_ons`"
555 fi
556 AC_SUBST(add_ons)
557 AC_SUBST(add_on_subdirs)
560 ###
561 ### I put this here to prevent those annoying emails from people who cannot
562 ### read and try to compile glibc on unsupported platforms. --drepper
563 ###
564 ### By using the undocumented --enable-hacker-mode option for configure
565 ### one can skip this test to make the configuration not fail for unsupported
566 ### platforms.
567 ###
568 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
569 case "$machine-$host_os" in
570 *-linux* | *-gnu*)
571 ;;
572 *)
573 echo "*** The GNU C library is currently not available for this platform."
574 echo "*** So far nobody cared to port it and if there is no volunteer it"
575 echo "*** might never happen. So, if you have interest to see glibc on"
576 echo "*** this platform visit"
577 echo "*** http://www.gnu.org/software/libc/porting.html"
578 echo "*** and join the group of porters"
579 exit 1
580 ;;
581 esac
582 fi
584 dnl We need to use [ and ] for other purposes for a while now.
585 changequote(,)dnl
586 # Expand the configuration machine name into a subdirectory by architecture
587 # type and particular chip. If an add-on configure fragment already set
588 # base_machine, we don't change it.
589 test -n "$base_machine" || case "$machine" in
590 i[4567]86) base_machine=i386 machine=i386/$machine ;;
591 powerpc64*) base_machine=powerpc machine=powerpc/powerpc64 ;;
592 powerpc*) base_machine=powerpc machine=powerpc/powerpc32 ;;
593 s390) base_machine=s390 machine=s390/s390-32 ;;
594 s390x) base_machine=s390 machine=s390/s390-64 ;;
595 sh3*) base_machine=sh machine=sh/sh3 ;;
596 sh4*) base_machine=sh machine=sh/sh4 ;;
597 sparc | sparcv[67])
598 base_machine=sparc machine=sparc/sparc32 ;;
599 sparcv8 | supersparc | hypersparc)
600 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
601 sparcv8plus | sparcv8plusa | sparcv9)
602 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
603 sparcv8plusb | sparcv9b)
604 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
605 sparcv9v)
606 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
607 sparcv9v2)
608 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
609 sparc64)
610 base_machine=sparc machine=sparc/sparc64 ;;
611 sparc64b)
612 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
613 sparc64v)
614 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
615 sparc64v2)
616 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
617 *) base_machine=$machine ;;
618 esac
619 changequote([,])dnl
620 AC_SUBST(base_machine)
622 if test "$base_machine" = "i386"; then
623 AC_DEFINE(USE_REGPARMS)
624 fi
626 # For the multi-arch option we need support in the assembler & linker.
627 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
628 libc_cv_ld_gnu_indirect_function, [dnl
629 cat > conftest.S <<EOF
630 .type foo,%gnu_indirect_function
631 foo:
632 .globl _start
633 _start:
634 .globl __start
635 __start:
636 .data
637 #ifdef _LP64
638 .quad foo
639 #else
640 .long foo
641 #endif
642 EOF
643 libc_cv_ld_gnu_indirect_function=no
644 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
645 -nostartfiles -nostdlib \
646 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
647 # Do a link to see if the backend supports IFUNC relocs.
648 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
649 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
650 libc_cv_ld_gnu_indirect_function=yes
651 }
652 fi
653 rm -f conftest*])
655 AC_MSG_CHECKING(whether .text pseudo-op must be used)
656 AC_CACHE_VAL(libc_cv_dot_text, [dnl
657 cat > conftest.s <<EOF
658 .text
659 EOF
660 libc_cv_dot_text=
661 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
662 libc_cv_dot_text=.text
663 fi
664 rm -f conftest*])
665 if test -z "$libc_cv_dot_text"; then
666 AC_MSG_RESULT(no)
667 else
668 AC_MSG_RESULT(yes)
669 fi
671 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
672 if test x"$multi_arch" = xyes; then
673 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
674 else
675 multi_arch=no
676 fi
677 fi
678 multi_arch_d=
679 if test x"$multi_arch" != xno; then
680 multi_arch_d=/multiarch
681 fi
683 # Compute the list of sysdep directories for this configuration.
684 # This can take a while to compute.
685 sysdep_dir=$srcdir/sysdeps
686 AC_MSG_CHECKING(sysdep dirs)
687 dnl We need to use [ and ] for other purposes for a while now.
688 changequote(,)dnl
689 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
690 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
692 test "x$base_os" != x || case "$os" in
693 gnu*)
694 base_os=mach/hurd ;;
695 linux*)
696 base_os=unix/sysv ;;
697 esac
699 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
700 tail=$os
701 ostry=$os
702 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
703 ostry="$ostry /$o"
704 tail=$o
705 done
706 o=`echo $tail | sed 's/[0-9]*$//'`
707 if test $o != $tail; then
708 ostry="$ostry /$o"
709 fi
710 # For linux-gnu, try linux-gnu, then linux.
711 o=`echo $tail | sed 's/-.*$//'`
712 if test $o != $tail; then
713 ostry="$ostry /$o"
714 fi
716 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
717 base=
718 tail=$base_os
719 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
720 set $b
721 base="$base /$1"
722 tail="$2"
723 done
725 # For sparc/sparc32, try sparc/sparc32 and then sparc.
726 mach=
727 tail=$machine${submachine:+/$submachine}
728 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
729 set $m
730 # Prepend the machine's FPU directory unless --without-fp.
731 if test "$with_fp" = yes; then
732 maybe_fpu=/fpu
733 else
734 maybe_fpu=/nofpu
735 fi
736 # For each machine term, try it with and then without /multiarch.
737 for try_fpu in $maybe_fpu ''; do
738 for try_multi in $multi_arch_d ''; do
739 mach="$mach /$1$try_fpu$try_multi"
740 done
741 done
742 tail="$2"
743 done
745 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
746 changequote([,])dnl
748 # Find what sysdep directories exist.
749 sysnames_add_ons=
750 sysnames=
751 for b in $base ''; do
752 for m0 in $mach ''; do
753 for v in /$vendor ''; do
754 test "$v" = / && continue
755 for o in /$ostry ''; do
756 test "$o" = / && continue
757 for m in $mach ''; do
758 for d in $add_ons_pfx ''; do
759 for a in $add_ons_sfx ''; do
760 try_suffix="$m0$b$v$o$m"
761 if test -n "$try_suffix"; then
762 try_srcdir="${srcdir}/"
763 case "$d" in
764 /*) try_srcdir= ;;
765 esac
766 try="${d}sysdeps$try_suffix$a"
767 test -n "$enable_debug_configure" &&
768 echo "$0 [DEBUG]: try $try" >&2
769 if test -d "$try_srcdir$try"; then
770 sysnames="$sysnames $try"
771 { test -n "$o" || test -n "$b"; } && os_used=t
772 { test -n "$m" || test -n "$m0"; } && machine_used=t
773 case x${m0:-$m} in
774 x*/$submachine) submachine_used=t ;;
775 esac
776 if test -n "$d"; then
777 case "$sysnames_add_ons" in
778 *" $d "*) ;;
779 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
780 esac
781 fi
782 fi
783 fi
784 done
785 done
786 done
787 done
788 done
789 done
790 done
792 # If the assembler supports gnu_indirect_function symbol type and the
793 # architecture supports multi-arch, we enable multi-arch by default.
794 case $sysnames_add_ons$sysnames in
795 *"$multi_arch_d"*)
796 ;;
797 *)
798 test x"$multi_arch" = xdefault && multi_arch=no
799 ;;
800 esac
801 if test x"$multi_arch" != xno; then
802 AC_DEFINE(USE_MULTIARCH)
803 fi
804 AC_SUBST(multi_arch)
806 if test -z "$os_used" && test "$os" != none; then
807 AC_MSG_ERROR(Operating system $os is not supported.)
808 fi
809 if test -z "$machine_used" && test "$machine" != none; then
810 AC_MSG_ERROR(The $machine is not supported.)
811 fi
812 if test -z "$submachine_used" && test -n "$submachine"; then
813 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
814 fi
815 AC_SUBST(submachine)
817 # We have now validated the configuration.
819 # Expand the list of system names into a full list of directories
820 # from each element's parent name and Implies file (if present).
821 set $sysnames
822 names=
823 while test $# -gt 0; do
824 name=$1
825 shift
827 case " $names " in *" $name "*)
828 # Already in the list.
829 continue
830 esac
832 # Report each name as we discover it, so there is no long pause in output.
833 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
835 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
837 case $name in
838 /*) xsrcdir= ;;
839 *) xsrcdir=$srcdir/ ;;
840 esac
841 test -n "$enable_debug_configure" &&
842 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
844 for implies_file in Implies Implies-before Implies-after; do
845 implies_type=`echo $implies_file | sed s/-/_/`
846 eval ${implies_type}=
847 if test -f $xsrcdir$name/$implies_file; then
848 # Collect more names from the `Implies' file (removing comments).
849 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
850 for x in $implied_candidate; do
851 found=no
852 if test -d $xsrcdir$name_base/$x; then
853 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
854 found=yes
855 fi
856 for d in $add_ons_pfx ''; do
857 try="${d}sysdeps/$x"
858 case $d in
859 /*) try_srcdir= ;;
860 *) try_srcdir=$srcdir/ ;;
861 esac
862 test -n "$enable_debug_configure" &&
863 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
864 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
865 then
866 eval "${implies_type}=\"\$${implies_type} \$try\""
867 found=yes
868 case "$sysnames_add_ons" in
869 *" $d "*) ;;
870 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
871 esac
872 fi
873 done
874 if test $found = no; then
875 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
876 fi
877 done
878 fi
879 done
881 # Add NAME to the list of names.
882 names="$names $name"
884 # Find the parent of NAME, using the empty string if it has none.
885 changequote(,)dnl
886 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
887 changequote([,])dnl
889 test -n "$enable_debug_configure" &&
890 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
891 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
893 # Add the names implied by NAME, and NAME's parent (if it has one), to
894 # the list of names to be processed (the argument list). We prepend the
895 # implied names to the list and append the parent. We want implied
896 # directories to come before further directories inferred from the
897 # configuration components; this ensures that for sysv4, unix/common
898 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
899 # after sysv4).
900 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
901 test -n "$sysnames" && set $sysnames
902 done
904 # Add the default directories.
905 default_sysnames="sysdeps/generic"
906 sysnames="$names $default_sysnames"
907 AC_SUBST(sysnames)
908 # The other names were emitted during the scan.
909 AC_MSG_RESULT($default_sysnames)
911 # Collect the list of add-ons that supply partial sysdeps trees.
912 sysdeps_add_ons=
913 for add_on in $add_ons; do
914 case "$add_on" in
915 /*) xsrcdir= ;;
916 *) xsrcdir="$srcdir/" ;;
917 esac
919 test -d "$xsrcdir$add_on/sysdeps" || {
920 case "$configured_add_ons " in
921 *" $add_on "*) ;;
922 *|'')
923 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
924 ;;
925 esac
926 continue
927 }
929 sysdeps_add_ons="$sysdeps_add_ons $add_on"
930 case "$sysnames_add_ons" in
931 *" $add_on/ "*) ;;
932 *|'')
933 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
934 continue ;;
935 esac
937 found=no
938 for d in $sysnames; do
939 case "$d" in
940 $add_on/sysdeps/*) ;;
941 *) continue ;;
942 esac
943 (cd "$xsrcdir$d" && for f in *[[!~]]; do
944 case "$f" in
945 sys|bits)
946 for ff in $f/*.h; do
947 test -d "$ff" || { test -e "$ff" && exit 88; }
948 done
949 ;;
950 *)
951 test -d "$f" || { test -e "$f" && exit 88; }
952 ;;
953 esac
954 done)
955 if test $? -eq 88; then
956 found=yes
957 break
958 fi
959 done
960 if test $found = no; then
961 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
962 fi
963 done
964 AC_SUBST(sysdeps_add_ons)
967 ### Locate tools.
969 AC_PROG_INSTALL
970 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
971 # The makefiles need to use a different form to find it in $srcdir.
972 INSTALL='\$(..)./scripts/install-sh -c'
973 fi
974 AC_PROG_LN_S
976 LIBC_PROG_BINUTILS
978 # Accept binutils 2.20 or newer.
979 AC_CHECK_PROG_VER(AS, $AS, --version,
980 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
981 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
982 AC_CHECK_PROG_VER(LD, $LD, --version,
983 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
984 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
986 # These programs are version sensitive.
987 AC_CHECK_TOOL_PREFIX
988 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
989 [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
990 critic_missing="$critic_missing gcc")
991 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
992 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
993 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
995 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
996 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
997 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
998 MSGFMT=: aux_missing="$aux_missing msgfmt")
999 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1000 [GNU texinfo.* \([0-9][0-9.]*\)],
1001 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
1002 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1003 AC_CHECK_PROG_VER(SED, sed, --version,
1004 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1005 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1006 SED=: aux_missing="$aux_missing sed")
1007 AC_CHECK_PROG_VER(AWK, gawk, --version,
1008 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1009 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1011 AC_CHECK_TOOL(NM, nm, false)
1013 if test "x$maintainer" = "xyes"; then
1014 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1015 case "x$AUTOCONF" in
1016 xno|x|x:) AUTOCONF=no ;;
1017 *)
1018 AC_CACHE_CHECK(dnl
1019 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1020 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1021 libc_cv_autoconf_works=yes
1022 else
1023 libc_cv_autoconf_works=no
1024 fi])
1025 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1026 ;;
1027 esac
1028 if test "x$AUTOCONF" = xno; then
1029 aux_missing="$aux_missing autoconf"
1030 fi
1031 else
1032 AUTOCONF=no
1033 fi
1035 test -n "$critic_missing" && AC_MSG_ERROR([
1036 *** These critical programs are missing or too old:$critic_missing
1037 *** Check the INSTALL file for required versions.])
1039 test -n "$aux_missing" && AC_MSG_WARN([
1040 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1041 *** some features will be disabled.
1042 *** Check the INSTALL file for required versions.])
1044 # if using special system headers, find out the compiler's sekrit
1045 # header directory and add that to the list. NOTE: Only does the right
1046 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1047 if test -n "$sysheaders"; then
1048 SYSINCLUDES=-nostdinc
1049 for d in include include-fixed; do
1050 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1051 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1052 done
1053 SYSINCLUDES="$SYSINCLUDES \
1054 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1055 if test -n "$CXX"; then
1056 CXX_SYSINCLUDES=
1057 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1058 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1059 test "x$cxxheaders" != x &&
1060 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1061 done
1062 fi
1063 fi
1064 AC_SUBST(SYSINCLUDES)
1065 AC_SUBST(CXX_SYSINCLUDES)
1067 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1068 # since this would lead to problems installing/building glibc.
1069 # LD_LIBRARY_PATH contains the current directory if one of the following
1070 # is true:
1071 # - one of the terminals (":" and ";") is the first or last sign
1072 # - two terminals occur directly after each other
1073 # - the path contains an element with a dot in it
1074 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1075 changequote(,)dnl
1076 case ${LD_LIBRARY_PATH} in
1077 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1078 ld_library_path_setting="contains current directory"
1079 ;;
1080 *)
1081 ld_library_path_setting="ok"
1082 ;;
1083 esac
1084 changequote([,])dnl
1085 AC_MSG_RESULT($ld_library_path_setting)
1086 if test "$ld_library_path_setting" != "ok"; then
1087 AC_MSG_ERROR([
1088 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1089 *** building glibc. Please change the environment variable
1090 *** and run configure again.])
1091 fi
1093 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1094 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1095 libc_cv_gcc_static_libgcc=
1096 else
1097 libc_cv_gcc_static_libgcc=-static-libgcc
1098 fi])
1099 AC_SUBST(libc_cv_gcc_static_libgcc)
1101 AC_PATH_PROG(BASH_SHELL, bash, no)
1102 if test "$BASH_SHELL" != no &&
1103 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1104 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1105 libc_cv_have_bash2=yes
1106 else
1107 libc_cv_have_bash2=no
1108 fi
1109 AC_SUBST(libc_cv_have_bash2)
1111 dnl We need a ksh compatible shell for tzselect.
1112 if test "$BASH_SHELL" = no; then
1113 AC_PATH_PROG(KSH, ksh, no)
1114 if test "$KSH" = no; then
1115 libc_cv_have_ksh=no
1116 else
1117 libc_cv_have_ksh=yes
1118 fi
1119 else
1120 KSH="$BASH_SHELL"
1121 AC_SUBST(KSH)
1122 libc_cv_have_ksh=yes
1123 fi
1124 AC_SUBST(libc_cv_have_ksh)
1126 AC_PATH_PROG(PERL, perl, no)
1127 if test "$PERL" != no &&
1128 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1129 PERL=no
1130 fi
1131 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1132 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1133 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1135 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1136 AC_TRY_COMPILE(dnl
1137 [#define __need_size_t
1138 #define __need_wchar_t
1139 #include <stddef.h>
1140 #define __need_NULL
1141 #include <stddef.h>], [size_t size; wchar_t wchar;
1142 #ifdef offsetof
1143 #error stddef.h ignored __need_*
1144 #endif
1145 if (&size == NULL || &wchar == NULL) abort ();],
1146 libc_cv_friendly_stddef=yes,
1147 libc_cv_friendly_stddef=no)])
1148 if test $libc_cv_friendly_stddef = yes; then
1149 config_vars="$config_vars
1150 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1151 fi
1153 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1154 libc_cv_need_minus_P, [dnl
1155 cat > conftest.S <<EOF
1156 #include "confdefs.h"
1157 /* Nothing whatsoever. */
1158 EOF
1159 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1160 libc_cv_need_minus_P=no
1161 else
1162 libc_cv_need_minus_P=yes
1163 fi
1164 rm -f conftest*])
1165 if test $libc_cv_need_minus_P = yes; then
1166 config_vars="$config_vars
1167 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1168 fi
1170 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1171 cat > conftest.s <<EOF
1172 ${libc_cv_dot_text}
1173 foo:
1174 .set glibc_conftest_frobozz,foo
1175 .globl glibc_conftest_frobozz
1176 EOF
1177 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1178 # (but it doesn't work), so we must do a linking check to be sure.
1179 cat > conftest1.c <<\EOF
1180 extern int glibc_conftest_frobozz;
1181 void _start() { glibc_conftest_frobozz = 1; }
1182 EOF
1183 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1184 -nostartfiles -nostdlib \
1185 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1186 libc_cv_asm_set_directive=yes
1187 else
1188 libc_cv_asm_set_directive=no
1189 fi
1190 rm -f conftest*])
1191 if test $libc_cv_asm_set_directive = yes; then
1192 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1193 fi
1195 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1196 libc_cv_asm_unique_object, [dnl
1197 cat > conftest.s <<EOF
1198 ${libc_cv_dot_text}
1199 _sym:
1200 .type _sym, %gnu_unique_object
1201 EOF
1202 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1203 libc_cv_asm_unique_object=yes
1204 else
1205 libc_cv_asm_unique_object=no
1206 fi
1207 rm -f conftest*])
1208 if test $libc_cv_asm_unique_object = yes; then
1209 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1210 fi
1212 AC_CACHE_CHECK(for .previous assembler directive,
1213 libc_cv_asm_previous_directive, [dnl
1214 cat > conftest.s <<EOF
1215 .section foo_section
1216 .previous
1217 EOF
1218 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1219 libc_cv_asm_previous_directive=yes
1220 else
1221 libc_cv_asm_previous_directive=no
1222 fi
1223 rm -f conftest*])
1224 if test $libc_cv_asm_previous_directive = yes; then
1225 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1226 else
1227 AC_CACHE_CHECK(for .popsection assembler directive,
1228 libc_cv_asm_popsection_directive, [dnl
1229 cat > conftest.s <<EOF
1230 .pushsection foo_section
1231 .popsection
1232 EOF
1233 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1234 libc_cv_asm_popsection_directive=yes
1235 else
1236 libc_cv_asm_popsection_directive=no
1237 fi
1238 rm -f conftest*])
1239 if test $libc_cv_asm_popsection_directive = yes; then
1240 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1241 fi
1242 fi
1243 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1244 libc_cv_asm_protected_directive, [dnl
1245 cat > conftest.s <<EOF
1246 .protected foo
1247 foo:
1248 .hidden bar
1249 bar:
1250 EOF
1251 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1252 libc_cv_asm_protected_directive=yes
1253 else
1254 AC_MSG_ERROR(assembler support for symbol visibility is required)
1255 fi
1256 rm -f conftest*])
1258 if test $libc_cv_asm_protected_directive = yes; then
1259 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1260 libc_cv_visibility_attribute,
1261 [cat > conftest.c <<EOF
1262 int foo __attribute__ ((visibility ("hidden"))) = 1;
1263 int bar __attribute__ ((visibility ("protected"))) = 1;
1264 EOF
1265 libc_cv_visibility_attribute=no
1266 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1267 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1268 if grep '\.protected.*bar' conftest.s >/dev/null; then
1269 libc_cv_visibility_attribute=yes
1270 fi
1271 fi
1272 fi
1273 rm -f conftest.{c,s}
1274 ])
1275 if test $libc_cv_visibility_attribute != yes; then
1276 AC_MSG_ERROR(compiler support for visibility attribute is required)
1277 fi
1278 fi
1280 if test $libc_cv_visibility_attribute = yes; then
1281 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1282 libc_cv_broken_visibility_attribute,
1283 [cat > conftest.c <<EOF
1284 int foo (int x);
1285 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1286 int bar (int x) { return x; }
1287 EOF
1288 libc_cv_broken_visibility_attribute=yes
1289 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1290 changequote(,)dnl
1291 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1292 changequote([,])dnl
1293 libc_cv_broken_visibility_attribute=no
1294 fi
1295 fi
1296 rm -f conftest.c conftest.s
1297 ])
1298 if test $libc_cv_broken_visibility_attribute = yes; then
1299 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1300 fi
1301 fi
1303 AC_CACHE_CHECK(for broken __attribute__((alias())),
1304 libc_cv_broken_alias_attribute,
1305 [cat > conftest.c <<EOF
1306 extern int foo (int x) __asm ("xyzzy");
1307 int bar (int x) { return x; }
1308 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1309 extern int dfoo;
1310 extern __typeof (dfoo) dfoo __asm ("abccb");
1311 int dfoo = 1;
1312 EOF
1313 libc_cv_broken_alias_attribute=yes
1314 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1315 if grep 'xyzzy' conftest.s >/dev/null &&
1316 grep 'abccb' conftest.s >/dev/null; then
1317 libc_cv_broken_alias_attribute=no
1318 fi
1319 fi
1320 rm -f conftest.c conftest.s
1321 ])
1322 if test $libc_cv_broken_alias_attribute = yes; then
1323 AC_MSG_ERROR(working alias attribute support required)
1324 fi
1326 if test $libc_cv_visibility_attribute = yes; then
1327 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1328 libc_cv_have_sdata_section,
1329 [echo "int i;" > conftest.c
1330 libc_cv_have_sdata_section=no
1331 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1332 | grep '\.sdata' >/dev/null; then
1333 libc_cv_have_sdata_section=yes
1334 fi
1335 rm -f conftest.c conftest.so
1336 ])
1337 if test $libc_cv_have_sdata_section = yes; then
1338 AC_DEFINE(HAVE_SDATA_SECTION)
1339 fi
1340 fi
1342 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1343 libc_cv_initfini_array, [dnl
1344 LIBC_TRY_LINK_STATIC([
1345 int foo (void) { return 1; }
1346 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1347 ],
1348 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1349 libc_cv_initfini_array=yes
1350 else
1351 libc_cv_initfini_array=no
1352 fi],
1353 [libc_cv_initfini_array=no])
1354 ])
1355 if test $libc_cv_initfini_array != yes; then
1356 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1357 fi
1359 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1360 libc_cv_ctors_header, [dnl
1361 libc_cv_ctors_header=yes
1362 LIBC_TRY_LINK_STATIC([
1363 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1364 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1365 ],
1366 [dnl
1367 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1368 { gsub(/\@<:@ */, "@<:@") }
1369 $2 == ".ctors" || $2 == ".dtors" {
1370 size = strtonum("0x" $6)
1371 align = strtonum("0x" $NF)
1372 seen@<:@$2@:>@ = 1
1373 stub@<:@$2@:>@ = size == align * 2
1374 }
1375 END {
1376 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1377 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1378 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1379 }
1380 '], [libc_cv_ctors_header=no])
1381 ], [dnl
1382 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1383 ])
1384 ])
1385 if test $libc_cv_ctors_header = no; then
1386 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1387 fi
1389 AC_CACHE_CHECK(for libunwind-support in compiler,
1390 libc_cv_cc_with_libunwind, [
1391 cat > conftest.c <<EOF
1392 int main (void) { return 0; }
1393 EOF
1394 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1395 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1396 libc_cv_cc_with_libunwind=yes
1397 else
1398 libc_cv_cc_with_libunwind=no
1399 fi
1400 rm -f conftest*])
1401 AC_SUBST(libc_cv_cc_with_libunwind)
1402 if test $libc_cv_cc_with_libunwind = yes; then
1403 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1404 fi
1406 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1407 [libc_cv_z_nodelete=yes],
1408 [AC_MSG_ERROR(linker with -z nodelete support required)])
1410 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1411 [libc_cv_z_nodlopen=yes],
1412 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1414 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1415 [libc_cv_z_initfirst=yes],
1416 [AC_MSG_ERROR(linker with -z initfirst support required)])
1418 # Add-on fragments can set these for other machines.
1419 libc_commonpagesize=${libc_commonpagesize:-no}
1420 libc_relro_required=${libc_relro_required:-no}
1421 case "$base_machine" in
1422 i[[34567]]86 | x86_64 | powerpc* | s390*)
1423 libc_commonpagesize=0x1000
1424 libc_relro_required=yes
1425 ;;
1426 sparc*)
1427 libc_commonpagesize=0x2000
1428 libc_relro_required=yes
1429 ;;
1430 esac
1432 if test $libc_commonpagesize != no; then
1433 AC_CACHE_CHECK(for -z relro option,
1434 libc_cv_z_relro, [dnl
1435 libc_cv_z_relro=no
1436 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1437 int _start (void) { return 42; }
1438 extern void _exit (int);
1439 /* Since these pointers are const, they should go in rodata.
1440 Since they refer to functions that have to be resolved by
1441 dynamic linking, they should instead go in RELRO data. */
1442 const void *const relro[] = { &_start, &_exit, 0 };
1443 /* GNU ld fails to produce RELRO data when it's very small and there is no
1444 normal writable data following it, or if only uninitialized (.bss) data
1445 follows it, or only very small writable data. */
1446 int data[0x10000] = { 1, };
1447 ]])])
1448 cat > conftest.awk <<\EOF
1449 BEGIN {
1450 result = "no"
1451 commonpagesize = strtonum(commonpagesize)
1452 }
1453 { print "LINE:", $0 > "/dev/stderr" }
1454 $1 == "GNU_RELRO" {
1455 vaddr = strtonum($3)
1456 memsz = strtonum($6)
1457 end = vaddr + memsz
1458 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1459 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1460 result = (end % commonpagesize == 0) ? "yes" : "broken"
1461 }
1462 END { print result }
1463 EOF
1464 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1465 -fPIC -shared -o conftest.so conftest.c
1466 -nostartfiles -nostdlib
1467 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1468 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1469 AC_TRY_COMMAND([
1470 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1471 conftest.ph > conftest.cps
1472 ]) &&
1473 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1474 rm -f conftest*])
1475 if { test "x$libc_relro_required" = xyes &&
1476 test "x$libc_cv_z_relro" != xyes
1477 }
1478 then
1479 AC_MSG_ERROR(linker with -z relro support required)
1480 fi
1481 else
1482 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1483 fi
1485 AC_CACHE_CHECK(for -Bgroup option,
1486 libc_cv_Bgroup, [dnl
1487 cat > conftest.c <<EOF
1488 int _start (void) { return 42; }
1489 EOF
1490 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1491 -fPIC -shared -o conftest.so conftest.c
1492 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1493 then
1494 libc_cv_Bgroup=yes
1495 else
1496 libc_cv_Bgroup=no
1497 fi
1498 rm -f conftest*])
1499 AC_SUBST(libc_cv_Bgroup)
1501 ASFLAGS_config=
1502 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1503 libc_cv_as_noexecstack, [dnl
1504 cat > conftest.c <<EOF
1505 void foo (void) { }
1506 EOF
1507 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1508 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1509 && grep .note.GNU-stack conftest.s >/dev/null \
1510 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1511 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1512 then
1513 libc_cv_as_noexecstack=yes
1514 else
1515 libc_cv_as_noexecstack=no
1516 fi
1517 rm -f conftest*])
1518 if test $libc_cv_as_noexecstack = yes; then
1519 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1520 fi
1521 AC_SUBST(ASFLAGS_config)
1523 AC_CACHE_CHECK(for -z combreloc,
1524 libc_cv_z_combreloc, [dnl
1525 cat > conftest.c <<EOF
1526 extern int bar (int);
1527 extern int mumble;
1528 int foo (void) { return bar (mumble); }
1529 EOF
1530 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1531 -fPIC -shared -o conftest.so conftest.c
1532 -nostdlib -nostartfiles
1533 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1534 then
1535 dnl The following test is a bit weak. We must use a tool which can test
1536 dnl cross-platform since the gcc used can be a cross compiler. Without
1537 dnl introducing new options this is not easily doable. Instead use a tool
1538 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1539 dnl look for a section named .rel.dyn.
1540 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1541 libc_cv_z_combreloc=yes
1542 else
1543 libc_cv_z_combreloc=no
1544 fi
1545 else
1546 libc_cv_z_combreloc=no
1547 fi
1548 rm -f conftest*])
1549 if test "$libc_cv_z_combreloc" = yes; then
1550 AC_DEFINE(HAVE_Z_COMBRELOC)
1551 fi
1552 AC_SUBST(libc_cv_z_combreloc)
1554 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1555 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1556 AC_SUBST(libc_cv_z_execstack)
1558 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1559 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1560 ])
1562 AC_SUBST(libc_cv_fpie)
1564 AC_CACHE_CHECK(for --hash-style option,
1565 libc_cv_hashstyle, [dnl
1566 cat > conftest.c <<EOF
1567 int _start (void) { return 42; }
1568 EOF
1569 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1570 -fPIC -shared -o conftest.so conftest.c
1571 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1572 then
1573 libc_cv_hashstyle=yes
1574 else
1575 libc_cv_hashstyle=no
1576 fi
1577 rm -f conftest*])
1578 AC_SUBST(libc_cv_hashstyle)
1580 # The linker's default -shared behavior is good enough if it
1581 # does these things that our custom linker scripts ensure that
1582 # all allocated NOTE sections come first.
1583 if test "$use_default_link" = default; then
1584 AC_CACHE_CHECK([for sufficient default -shared layout],
1585 libc_cv_use_default_link, [dnl
1586 libc_cv_use_default_link=no
1587 cat > conftest.s <<\EOF
1588 .section .note.a,"a",%note
1589 .balign 4
1590 .long 4,4,9
1591 .string "GNU"
1592 .string "foo"
1593 .section .note.b,"a",%note
1594 .balign 4
1595 .long 4,4,9
1596 .string "GNU"
1597 .string "bar"
1598 EOF
1599 if AC_TRY_COMMAND([dnl
1600 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1601 ac_try=`$READELF -S conftest.so | sed -n \
1602 ['${x;p;}
1603 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1604 t a
1605 b
1606 : a
1607 H']`
1608 then
1609 libc_seen_a=no libc_seen_b=no
1610 set -- $ac_try
1611 while test $# -ge 2 -a "$1" = NOTE; do
1612 case "$2" in
1613 .note.a) libc_seen_a=yes ;;
1614 .note.b) libc_seen_b=yes ;;
1615 esac
1616 shift 2
1617 done
1618 case "$libc_seen_a$libc_seen_b" in
1619 yesyes)
1620 libc_cv_use_default_link=yes
1621 ;;
1622 *)
1623 echo >&AS_MESSAGE_LOG_FD "\
1624 $libc_seen_a$libc_seen_b from:
1625 $ac_try"
1626 ;;
1627 esac
1628 fi
1629 rm -f conftest*])
1630 use_default_link=$libc_cv_use_default_link
1631 fi
1633 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1634 if libc_cv_output_format=`
1635 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1636 then
1637 :
1638 else
1639 libc_cv_output_format=
1640 fi
1641 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1642 AC_SUBST(libc_cv_output_format)
1644 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1645 cat > conftest.c <<EOF
1646 int foo;
1647 EOF
1648 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1649 conftest.c 1>&AS_MESSAGE_LOG_FD])
1650 then
1651 libc_cv_fno_toplevel_reorder=yes
1652 else
1653 libc_cv_fno_toplevel_reorder=no
1654 fi
1655 rm -f conftest*])
1656 if test $libc_cv_fno_toplevel_reorder = yes; then
1657 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1658 else
1659 fno_unit_at_a_time=-fno-unit-at-a-time
1660 fi
1661 AC_SUBST(fno_unit_at_a_time)
1663 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1664 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1665 [libc_cv_ssp=yes],
1666 [libc_cv_ssp=no])
1667 ])
1668 AC_SUBST(libc_cv_ssp)
1670 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1671 cat > conftest.c <<EOF
1672 int foo;
1673 #ifdef __GNUC_GNU_INLINE__
1674 main () { return 0;}
1675 #else
1676 #error
1677 #endif
1678 EOF
1679 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1680 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1681 then
1682 libc_cv_gnu89_inline=yes
1683 else
1684 libc_cv_gnu89_inline=no
1685 fi
1686 rm -f conftest*])
1687 if test $libc_cv_gnu89_inline = yes; then
1688 gnu89_inline=-fgnu89-inline
1689 else
1690 gnu89_inline=
1691 fi
1692 AC_SUBST(gnu89_inline)
1694 AC_CACHE_CHECK(whether cc puts quotes around section names,
1695 libc_cv_have_section_quotes,
1696 [cat > conftest.c <<EOF
1697 static const int foo
1698 __attribute__ ((section ("bar"))) = 1;
1699 EOF
1700 if ${CC-cc} -S conftest.c -o conftest.s; then
1701 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1702 libc_cv_have_section_quotes=yes
1703 else
1704 libc_cv_have_section_quotes=no
1705 fi
1706 else
1707 libc_cv_have_section_quotes=unknown
1708 fi
1709 rm -f conftest.{c,s}
1710 ])
1711 if test $libc_cv_have_section_quotes = yes; then
1712 AC_DEFINE(HAVE_SECTION_QUOTES)
1713 fi
1715 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1716 [dnl
1717 cat > conftest.s <<EOF
1718 ${libc_cv_dot_text}
1719 .globl foo
1720 foo:
1721 .weak foo
1722 .weak bar; bar = foo
1723 EOF
1724 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1725 libc_cv_asm_weak_directive=yes
1726 else
1727 libc_cv_asm_weak_directive=no
1728 fi
1729 rm -f conftest*])
1731 if test $libc_cv_asm_weak_directive = no; then
1732 AC_CACHE_CHECK(for assembler .weakext directive,
1733 libc_cv_asm_weakext_directive,
1734 [dnl
1735 cat > conftest.s <<EOF
1736 ${libc_cv_dot_text}
1737 .globl foo
1738 foo:
1739 .weakext bar foo
1740 .weakext baz
1741 .globl baz
1742 baz:
1743 EOF
1744 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1745 libc_cv_asm_weakext_directive=yes
1746 else
1747 libc_cv_asm_weakext_directive=no
1748 fi
1749 rm -f conftest*])
1751 fi # no .weak
1753 if test $libc_cv_asm_weak_directive = yes; then
1754 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1755 elif test $libc_cv_asm_weakext_directive = yes; then
1756 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1757 fi
1759 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1760 case $machine in
1761 sparc/sparc64*) cfi_offset=2047;;
1762 *) cfi_offset=0;;
1763 esac
1764 cat > conftest.s <<EOF
1765 .text
1766 .type func,%function
1767 func:
1768 .cfi_startproc
1769 .cfi_remember_state
1770 .cfi_rel_offset 1, $cfi_offset
1771 .cfi_endproc
1772 EOF
1773 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1774 libc_cv_asm_cfi_directives=yes
1775 else
1776 libc_cv_asm_cfi_directives=no
1777 fi
1778 rm -f conftest*])
1779 if test $libc_cv_asm_cfi_directives = yes; then
1780 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1781 fi
1783 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1784 cat > conftest.c <<\EOF
1785 _start () {}
1786 int __eh_pc;
1787 __throw () {}
1788 EOF
1789 dnl No \ in command here because it ends up inside ''.
1790 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1791 -nostdlib -nostartfiles -Wl,--no-whole-archive
1792 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1793 libc_cv_ld_no_whole_archive=yes
1794 else
1795 libc_cv_ld_no_whole_archive=no
1796 fi
1797 rm -f conftest*])
1798 if test $libc_cv_ld_no_whole_archive = no; then
1799 AC_MSG_ERROR([support for --no-whole-archive is needed])
1800 fi
1802 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1803 cat > conftest.c <<\EOF
1804 _start () {}
1805 int __eh_pc;
1806 __throw () {}
1807 EOF
1808 dnl No \ in command here because it ends up inside ''.
1809 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1810 -nostdlib -nostartfiles -fexceptions
1811 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1812 libc_cv_gcc_exceptions=yes
1813 else
1814 libc_cv_gcc_exceptions=no
1815 fi
1816 rm -f conftest*])
1817 if test $libc_cv_gcc_exceptions = yes; then
1818 exceptions=-fexceptions
1819 fi
1820 AC_SUBST(exceptions)dnl
1822 if test "$host_cpu" = powerpc ; then
1823 # Check for a bug present in at least versions 2.8.x of GCC
1824 # and versions 1.0.x of EGCS.
1825 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1826 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1827 libc_cv_c_asmcr0_bug='no',
1828 libc_cv_c_asmcr0_bug='yes')])
1829 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1830 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1831 fi
1832 fi
1834 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1835 cat > conftest.c <<\EOF
1836 void zero (void *x)
1837 {
1838 __builtin_memset (x, 0, 1000);
1839 }
1840 EOF
1841 dnl
1842 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1843 then
1844 libc_cv_gcc_builtin_memset=no
1845 else
1846 libc_cv_gcc_builtin_memset=yes
1847 fi
1848 rm -f conftest* ])
1849 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1850 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1851 fi
1853 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1854 cat > conftest.c <<\EOF
1855 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1856 char *foo (const char *a, const char *b)
1857 {
1858 return __builtin_strstr (a, b);
1859 }
1860 EOF
1861 dnl
1862 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1863 then
1864 libc_cv_gcc_builtin_redirection=yes
1865 else
1866 libc_cv_gcc_builtin_redirection=no
1867 fi
1868 rm -f conftest* ])
1869 if test "$libc_cv_gcc_builtin_redirection" = no; then
1870 AC_MSG_ERROR([support for the symbol redirection needed])
1871 fi
1873 dnl Check whether the compiler supports the __thread keyword.
1874 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1875 [cat > conftest.c <<\EOF
1876 __thread int a = 42;
1877 EOF
1878 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1879 libc_cv_gcc___thread=yes
1880 else
1881 libc_cv_gcc___thread=no
1882 fi
1883 rm -f conftest*])
1884 if test "$libc_cv_gcc___thread" = no; then
1885 AC_MSG_ERROR([support for the __thread keyword is required])
1886 fi
1888 dnl Check whether the compiler supports the tls_model attribute.
1889 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1890 cat > conftest.c <<\EOF
1891 extern __thread int a __attribute__((tls_model ("initial-exec")));
1892 EOF
1893 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1894 libc_cv_gcc_tls_model_attr=yes
1895 else
1896 libc_cv_gcc_tls_model_attr=no
1897 fi
1898 rm -f conftest*])
1899 if test "$libc_cv_gcc_tls_model_attr" = no; then
1900 AC_MSG_ERROR([support for the tls_model attribute is required])
1901 fi
1903 dnl Determine how to disable generation of FMA instructions.
1904 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1905 libc_cv_cc_nofma, [dnl
1906 libc_cv_cc_nofma=
1907 for opt in -ffp-contract=off -mno-fused-madd; do
1908 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1909 done])
1910 AC_SUBST(libc_cv_cc_nofma)
1912 if test -n "$submachine"; then
1913 AC_CACHE_CHECK([for compiler option for CPU variant],
1914 libc_cv_cc_submachine, [dnl
1915 libc_cv_cc_submachine=no
1916 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1917 LIBC_TRY_CC_OPTION([$opt], [
1918 libc_cv_cc_submachine="$opt"
1919 break], [])
1920 done])
1921 if test "x$libc_cv_cc_submachine" = xno; then
1922 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1923 fi
1924 fi
1925 AC_SUBST(libc_cv_cc_submachine)
1927 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1928 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1929 cat > conftest.c <<EOF
1930 void
1931 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1932 foo (void) {}
1933 EOF
1934 libc_cv_cc_loop_to_function=no
1935 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1936 then
1937 libc_cv_cc_loop_to_function=yes
1938 fi
1939 rm -f conftest*])
1940 if test $libc_cv_cc_loop_to_function = yes; then
1941 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1942 fi
1943 AC_SUBST(libc_cv_cc_loop_to_function)
1945 dnl Check whether we have the gd library available.
1946 AC_MSG_CHECKING(for libgd)
1947 if test "$with_gd" != "no"; then
1948 old_CFLAGS="$CFLAGS"
1949 CFLAGS="$CFLAGS $libgd_include"
1950 old_LDFLAGS="$LDFLAGS"
1951 LDFLAGS="$LDFLAGS $libgd_ldflags"
1952 old_LIBS="$LIBS"
1953 LIBS="$LIBS -lgd -lpng -lz -lm"
1954 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1955 CFLAGS="$old_CFLAGS"
1956 LDFLAGS="$old_LDFLAGS"
1957 LIBS="$old_LIBS"
1958 else
1959 LIBGD=no
1960 fi
1961 AC_MSG_RESULT($LIBGD)
1962 AC_SUBST(LIBGD)
1964 # SELinux detection
1965 if test x$with_selinux = xno ; then
1966 have_selinux=no;
1967 else
1968 # See if we have the SELinux library
1969 AC_CHECK_LIB(selinux, is_selinux_enabled,
1970 have_selinux=yes, have_selinux=no)
1971 # See if we have the SELinux header with the NSCD permissions in it.
1972 if test x$have_selinux = xyes ; then
1973 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1974 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1975 [#ifdef NSCD__SHMEMHOST
1976 return 0;
1977 #else
1978 #error NSCD__SHMEMHOST not defined
1979 #endif],
1980 have_selinux=yes, have_selinux=no)
1981 AC_MSG_RESULT($have_selinux)
1982 fi
1984 if test x$with_selinux = xyes ; then
1985 if test x$have_selinux = xno ; then
1986 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
1987 fi
1988 fi
1989 fi
1990 # Check if we're building with SELinux support.
1991 if test "x$have_selinux" = xyes; then
1992 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1994 # See if we have the libaudit library
1995 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1996 have_libaudit=yes, have_libaudit=no)
1997 if test "x$have_libaudit" = xyes; then
1998 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1999 fi
2000 AC_SUBST(have_libaudit)
2002 # See if we have the libcap library
2003 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
2004 if test "x$have_libcap" = xyes; then
2005 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
2006 fi
2007 AC_SUBST(have_libcap)
2008 fi
2009 AC_SUBST(have_selinux)
2011 dnl check for the size of 'long double'.
2012 AC_CHECK_SIZEOF(long double, 0)
2013 sizeof_long_double=$ac_cv_sizeof_long_double
2014 AC_SUBST(sizeof_long_double)
2016 CPPUNDEFS=
2017 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2018 dnl Since we are building the implementations of the fortified functions here,
2019 dnl having the macro defined interacts very badly.
2020 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2021 [AC_TRY_COMPILE([], [
2022 #ifdef _FORTIFY_SOURCE
2023 # error bogon
2024 #endif],
2025 [libc_cv_predef_fortify_source=no],
2026 [libc_cv_predef_fortify_source=yes])])
2027 if test $libc_cv_predef_fortify_source = yes; then
2028 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2029 fi
2030 AC_SUBST(CPPUNDEFS)
2032 dnl Check for silly hacked compilers inserting -fstack-protector.
2033 dnl This breaks badly for the early startup code we compile, since
2034 dnl the compiled code can refer to a magic machine-dependent location
2035 dnl for the canary value before we have sufficient setup for that to
2036 dnl work. It's also questionable to build all of libc with this flag
2037 dnl even when you're doing that for most applications you build, since
2038 dnl libc's code is so heavily-used and performance-sensitive. If we
2039 dnl ever really want to make that work, it should be enabled explicitly
2040 dnl in the libc build, not inherited from implicit compiler settings.
2041 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2042 libc_cv_predef_stack_protector, [
2043 AC_TRY_COMPILE([extern void foobar (char *);],
2044 [char large_array[2048]; foobar (large_array);], [
2045 libc_undefs=`$NM -u conftest.o |
2046 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2047 2>&AS_MESSAGE_LOG_FD` || {
2048 AC_MSG_ERROR([confusing output from $NM -u])
2049 }
2050 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2051 # On some architectures, there are architecture-specific undefined
2052 # symbols (resolved by the linker), so filter out unknown symbols.
2053 # This will fail to produce the correct result if the compiler
2054 # defaults to -fstack-protector but this produces an undefined symbol
2055 # other than __stack_chk_fail. However, compilers like that have not
2056 # been encountered in practice.
2057 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2058 case "$libc_undefs" in
2059 foobar) libc_cv_predef_stack_protector=no ;;
2060 '__stack_chk_fail
2061 foobar') libc_cv_predef_stack_protector=yes ;;
2062 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2063 esac],
2064 [AC_MSG_ERROR([test compilation failed])])
2065 ])
2066 libc_extra_cflags=
2067 if test $libc_cv_predef_stack_protector = yes; then
2068 libc_extra_cflags=-fno-stack-protector
2069 fi
2070 AC_SUBST(libc_extra_cflags)
2072 ### End of automated tests.
2073 ### Now run sysdeps configure fragments.
2075 # They also can set these variables.
2076 use_ldconfig=no
2077 ldd_rewrite_script=no
2078 libc_cv_sysconfdir=$sysconfdir
2079 libc_cv_localstatedir=$localstatedir
2080 libc_cv_gcc_unwind_find_fde=no
2081 libc_cv_idn=no
2083 # Iterate over all the sysdep directories we will use, running their
2084 # configure fragments.
2085 for dir in $sysnames; do
2086 case $dir in
2087 /*) dest=$dir ;;
2088 *) dest=$srcdir/$dir ;;
2089 esac
2090 if test -r $dest/configure; then
2091 AC_MSG_RESULT(running configure fragment for $dir)
2092 . $dest/configure
2093 fi
2094 done
2096 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2097 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2098 fi
2099 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2101 # A sysdeps configure fragment can reset this if IFUNC is not actually
2102 # usable even though the assembler knows how to generate the symbol type.
2103 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2104 AC_DEFINE(HAVE_IFUNC)
2105 fi
2107 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2108 # configure fragment can override the value to prevent this AC_DEFINE.
2109 AC_SUBST(use_nscd)
2110 if test "x$use_nscd" != xno; then
2111 AC_DEFINE([USE_NSCD])
2112 fi
2113 if test "x$build_nscd" = xdefault; then
2114 build_nscd=$use_nscd
2115 fi
2117 # Test for old glibc 2.0.x headers so that they can be removed properly
2118 # Search only in includedir.
2119 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2120 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2121 then
2122 old_glibc_headers=yes
2123 else
2124 old_glibc_headers=no
2125 fi
2126 AC_MSG_RESULT($old_glibc_headers)
2127 if test ${old_glibc_headers} = yes; then
2128 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2129 AC_MSG_WARN(*** be removed.)
2130 fi
2131 AC_SUBST(old_glibc_headers)
2133 AC_SUBST(libc_cv_slibdir)
2134 AC_SUBST(libc_cv_rtlddir)
2135 AC_SUBST(libc_cv_localedir)
2136 AC_SUBST(libc_cv_sysconfdir)
2137 AC_SUBST(libc_cv_localstatedir)
2138 AC_SUBST(libc_cv_rootsbindir)
2139 AC_SUBST(libc_cv_forced_unwind)
2141 if test x$use_ldconfig = xyes; then
2142 AC_DEFINE(USE_LDCONFIG)
2143 fi
2144 AC_SUBST(use_ldconfig)
2145 AC_SUBST(ldd_rewrite_script)
2147 AC_SUBST(static)
2148 AC_SUBST(shared)
2150 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2151 [libc_cv_pic_default=yes
2152 cat > conftest.c <<EOF
2153 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2154 # error PIC is default.
2155 #endif
2156 EOF
2157 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2158 libc_cv_pic_default=no
2159 fi
2160 rm -f conftest.*])
2161 AC_SUBST(libc_cv_pic_default)
2163 AC_SUBST(profile)
2164 AC_SUBST(static_nss)
2166 AC_SUBST(DEFINES)
2168 dnl See sysdeps/mach/configure.ac for this variable.
2169 AC_SUBST(mach_interface_list)
2171 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2172 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2173 AC_SUBST(VERSION)
2174 AC_SUBST(RELEASE)
2176 AC_CONFIG_FILES([config.make Makefile])
2177 AC_CONFIG_COMMANDS([default],[[
2178 case $CONFIG_FILES in *config.make*)
2179 echo "$config_vars" >> config.make;;
2180 esac
2181 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2182 AC_OUTPUT