| blob | 97a959114dc740c1fa01f742b29f536d3d77119c |
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 $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1095 libc_cv_gcc_static_libgcc=
1096 else
1097 libc_cv_gcc_static_libgcc=-static-libgcc
1098 fi])
1099 AC_SUBST(libc_cv_gcc_static_libgcc)
1101 AC_PATH_PROG(BASH_SHELL, bash, no)
1103 AC_PATH_PROG(PERL, perl, no)
1104 if test "$PERL" != no &&
1105 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1106 PERL=no
1107 fi
1108 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1109 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1110 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1112 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1113 AC_TRY_COMPILE(dnl
1114 [#define __need_size_t
1115 #define __need_wchar_t
1116 #include <stddef.h>
1117 #define __need_NULL
1118 #include <stddef.h>], [size_t size; wchar_t wchar;
1119 #ifdef offsetof
1120 #error stddef.h ignored __need_*
1121 #endif
1122 if (&size == NULL || &wchar == NULL) abort ();],
1123 libc_cv_friendly_stddef=yes,
1124 libc_cv_friendly_stddef=no)])
1125 if test $libc_cv_friendly_stddef = yes; then
1126 config_vars="$config_vars
1127 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1128 fi
1130 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1131 libc_cv_need_minus_P, [dnl
1132 cat > conftest.S <<EOF
1133 #include "confdefs.h"
1134 /* Nothing whatsoever. */
1135 EOF
1136 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1137 libc_cv_need_minus_P=no
1138 else
1139 libc_cv_need_minus_P=yes
1140 fi
1141 rm -f conftest*])
1142 if test $libc_cv_need_minus_P = yes; then
1143 config_vars="$config_vars
1144 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1145 fi
1147 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1148 cat > conftest.s <<EOF
1149 ${libc_cv_dot_text}
1150 foo:
1151 .set glibc_conftest_frobozz,foo
1152 .globl glibc_conftest_frobozz
1153 EOF
1154 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1155 # (but it doesn't work), so we must do a linking check to be sure.
1156 cat > conftest1.c <<\EOF
1157 extern int glibc_conftest_frobozz;
1158 void _start() { glibc_conftest_frobozz = 1; }
1159 EOF
1160 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1161 -nostartfiles -nostdlib \
1162 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1163 libc_cv_asm_set_directive=yes
1164 else
1165 libc_cv_asm_set_directive=no
1166 fi
1167 rm -f conftest*])
1168 if test $libc_cv_asm_set_directive = yes; then
1169 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1170 fi
1172 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1173 libc_cv_asm_unique_object, [dnl
1174 cat > conftest.s <<EOF
1175 ${libc_cv_dot_text}
1176 _sym:
1177 .type _sym, %gnu_unique_object
1178 EOF
1179 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1180 libc_cv_asm_unique_object=yes
1181 else
1182 libc_cv_asm_unique_object=no
1183 fi
1184 rm -f conftest*])
1185 if test $libc_cv_asm_unique_object = yes; then
1186 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1187 fi
1189 AC_CACHE_CHECK(for .previous assembler directive,
1190 libc_cv_asm_previous_directive, [dnl
1191 cat > conftest.s <<EOF
1192 .section foo_section
1193 .previous
1194 EOF
1195 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1196 libc_cv_asm_previous_directive=yes
1197 else
1198 libc_cv_asm_previous_directive=no
1199 fi
1200 rm -f conftest*])
1201 if test $libc_cv_asm_previous_directive = yes; then
1202 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1203 else
1204 AC_CACHE_CHECK(for .popsection assembler directive,
1205 libc_cv_asm_popsection_directive, [dnl
1206 cat > conftest.s <<EOF
1207 .pushsection foo_section
1208 .popsection
1209 EOF
1210 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1211 libc_cv_asm_popsection_directive=yes
1212 else
1213 libc_cv_asm_popsection_directive=no
1214 fi
1215 rm -f conftest*])
1216 if test $libc_cv_asm_popsection_directive = yes; then
1217 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1218 fi
1219 fi
1220 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1221 libc_cv_asm_protected_directive, [dnl
1222 cat > conftest.s <<EOF
1223 .protected foo
1224 foo:
1225 .hidden bar
1226 bar:
1227 EOF
1228 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1229 libc_cv_asm_protected_directive=yes
1230 else
1231 AC_MSG_ERROR(assembler support for symbol visibility is required)
1232 fi
1233 rm -f conftest*])
1235 if test $libc_cv_asm_protected_directive = yes; then
1236 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1237 libc_cv_visibility_attribute,
1238 [cat > conftest.c <<EOF
1239 int foo __attribute__ ((visibility ("hidden"))) = 1;
1240 int bar __attribute__ ((visibility ("protected"))) = 1;
1241 EOF
1242 libc_cv_visibility_attribute=no
1243 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1244 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1245 if grep '\.protected.*bar' conftest.s >/dev/null; then
1246 libc_cv_visibility_attribute=yes
1247 fi
1248 fi
1249 fi
1250 rm -f conftest.{c,s}
1251 ])
1252 if test $libc_cv_visibility_attribute != yes; then
1253 AC_MSG_ERROR(compiler support for visibility attribute is required)
1254 fi
1255 fi
1257 if test $libc_cv_visibility_attribute = yes; then
1258 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1259 libc_cv_broken_visibility_attribute,
1260 [cat > conftest.c <<EOF
1261 int foo (int x);
1262 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1263 int bar (int x) { return x; }
1264 EOF
1265 libc_cv_broken_visibility_attribute=yes
1266 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1267 changequote(,)dnl
1268 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1269 changequote([,])dnl
1270 libc_cv_broken_visibility_attribute=no
1271 fi
1272 fi
1273 rm -f conftest.c conftest.s
1274 ])
1275 if test $libc_cv_broken_visibility_attribute = yes; then
1276 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1277 fi
1278 fi
1280 AC_CACHE_CHECK(for broken __attribute__((alias())),
1281 libc_cv_broken_alias_attribute,
1282 [cat > conftest.c <<EOF
1283 extern int foo (int x) __asm ("xyzzy");
1284 int bar (int x) { return x; }
1285 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1286 extern int dfoo;
1287 extern __typeof (dfoo) dfoo __asm ("abccb");
1288 int dfoo = 1;
1289 EOF
1290 libc_cv_broken_alias_attribute=yes
1291 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1292 if grep 'xyzzy' conftest.s >/dev/null &&
1293 grep 'abccb' conftest.s >/dev/null; then
1294 libc_cv_broken_alias_attribute=no
1295 fi
1296 fi
1297 rm -f conftest.c conftest.s
1298 ])
1299 if test $libc_cv_broken_alias_attribute = yes; then
1300 AC_MSG_ERROR(working alias attribute support required)
1301 fi
1303 if test $libc_cv_visibility_attribute = yes; then
1304 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1305 libc_cv_have_sdata_section,
1306 [echo "int i;" > conftest.c
1307 libc_cv_have_sdata_section=no
1308 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1309 | grep '\.sdata' >/dev/null; then
1310 libc_cv_have_sdata_section=yes
1311 fi
1312 rm -f conftest.c conftest.so
1313 ])
1314 if test $libc_cv_have_sdata_section = yes; then
1315 AC_DEFINE(HAVE_SDATA_SECTION)
1316 fi
1317 fi
1319 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1320 libc_cv_initfini_array, [dnl
1321 LIBC_TRY_LINK_STATIC([
1322 int foo (void) { return 1; }
1323 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1324 ],
1325 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1326 libc_cv_initfini_array=yes
1327 else
1328 libc_cv_initfini_array=no
1329 fi],
1330 [libc_cv_initfini_array=no])
1331 ])
1332 if test $libc_cv_initfini_array != yes; then
1333 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1334 fi
1336 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1337 libc_cv_ctors_header, [dnl
1338 libc_cv_ctors_header=yes
1339 LIBC_TRY_LINK_STATIC([
1340 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1341 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1342 ],
1343 [dnl
1344 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1345 { gsub(/\@<:@ */, "@<:@") }
1346 $2 == ".ctors" || $2 == ".dtors" {
1347 size = strtonum("0x" $6)
1348 align = strtonum("0x" $NF)
1349 seen@<:@$2@:>@ = 1
1350 stub@<:@$2@:>@ = size == align * 2
1351 }
1352 END {
1353 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1354 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1355 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1356 }
1357 '], [libc_cv_ctors_header=no])
1358 ], [dnl
1359 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1360 ])
1361 ])
1362 if test $libc_cv_ctors_header = no; then
1363 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1364 fi
1366 AC_CACHE_CHECK(for libunwind-support in compiler,
1367 libc_cv_cc_with_libunwind, [
1368 cat > conftest.c <<EOF
1369 int main (void) { return 0; }
1370 EOF
1371 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1372 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1373 libc_cv_cc_with_libunwind=yes
1374 else
1375 libc_cv_cc_with_libunwind=no
1376 fi
1377 rm -f conftest*])
1378 AC_SUBST(libc_cv_cc_with_libunwind)
1379 if test $libc_cv_cc_with_libunwind = yes; then
1380 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1381 fi
1383 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1384 [libc_cv_z_nodelete=yes],
1385 [AC_MSG_ERROR(linker with -z nodelete support required)])
1387 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1388 [libc_cv_z_nodlopen=yes],
1389 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1391 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1392 [libc_cv_z_initfirst=yes],
1393 [AC_MSG_ERROR(linker with -z initfirst support required)])
1395 # Add-on fragments can set these for other machines.
1396 libc_commonpagesize=${libc_commonpagesize:-no}
1397 libc_relro_required=${libc_relro_required:-no}
1398 case "$base_machine" in
1399 i[[34567]]86 | x86_64 | powerpc* | s390*)
1400 libc_commonpagesize=0x1000
1401 libc_relro_required=yes
1402 ;;
1403 sparc*)
1404 libc_commonpagesize=0x2000
1405 libc_relro_required=yes
1406 ;;
1407 esac
1409 if test $libc_commonpagesize != no; then
1410 AC_CACHE_CHECK(for -z relro option,
1411 libc_cv_z_relro, [dnl
1412 libc_cv_z_relro=no
1413 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1414 int _start (void) { return 42; }
1415 extern void _exit (int);
1416 /* Since these pointers are const, they should go in rodata.
1417 Since they refer to functions that have to be resolved by
1418 dynamic linking, they should instead go in RELRO data. */
1419 const void *const relro[] = { &_start, &_exit, 0 };
1420 /* GNU ld fails to produce RELRO data when it's very small and there is no
1421 normal writable data following it, or if only uninitialized (.bss) data
1422 follows it, or only very small writable data. */
1423 int data[0x10000] = { 1, };
1424 ]])])
1425 cat > conftest.awk <<\EOF
1426 BEGIN {
1427 result = "no"
1428 commonpagesize = strtonum(commonpagesize)
1429 }
1430 { print "LINE:", $0 > "/dev/stderr" }
1431 $1 == "GNU_RELRO" {
1432 vaddr = strtonum($3)
1433 memsz = strtonum($6)
1434 end = vaddr + memsz
1435 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1436 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1437 result = (end % commonpagesize == 0) ? "yes" : "broken"
1438 }
1439 END { print result }
1440 EOF
1441 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1442 -fPIC -shared -o conftest.so conftest.c
1443 -nostartfiles -nostdlib
1444 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1445 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1446 AC_TRY_COMMAND([
1447 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1448 conftest.ph > conftest.cps
1449 ]) &&
1450 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1451 rm -f conftest*])
1452 if { test "x$libc_relro_required" = xyes &&
1453 test "x$libc_cv_z_relro" != xyes
1454 }
1455 then
1456 AC_MSG_ERROR(linker with -z relro support required)
1457 fi
1458 else
1459 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1460 fi
1462 AC_CACHE_CHECK(for -Bgroup option,
1463 libc_cv_Bgroup, [dnl
1464 cat > conftest.c <<EOF
1465 int _start (void) { return 42; }
1466 EOF
1467 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1468 -fPIC -shared -o conftest.so conftest.c
1469 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1470 then
1471 libc_cv_Bgroup=yes
1472 else
1473 libc_cv_Bgroup=no
1474 fi
1475 rm -f conftest*])
1476 AC_SUBST(libc_cv_Bgroup)
1478 ASFLAGS_config=
1479 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1480 libc_cv_as_noexecstack, [dnl
1481 cat > conftest.c <<EOF
1482 void foo (void) { }
1483 EOF
1484 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1485 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1486 && grep .note.GNU-stack conftest.s >/dev/null \
1487 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1488 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1489 then
1490 libc_cv_as_noexecstack=yes
1491 else
1492 libc_cv_as_noexecstack=no
1493 fi
1494 rm -f conftest*])
1495 if test $libc_cv_as_noexecstack = yes; then
1496 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1497 fi
1498 AC_SUBST(ASFLAGS_config)
1500 AC_CACHE_CHECK(for -z combreloc,
1501 libc_cv_z_combreloc, [dnl
1502 cat > conftest.c <<EOF
1503 extern int bar (int);
1504 extern int mumble;
1505 int foo (void) { return bar (mumble); }
1506 EOF
1507 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1508 -fPIC -shared -o conftest.so conftest.c
1509 -nostdlib -nostartfiles
1510 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1511 then
1512 dnl The following test is a bit weak. We must use a tool which can test
1513 dnl cross-platform since the gcc used can be a cross compiler. Without
1514 dnl introducing new options this is not easily doable. Instead use a tool
1515 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1516 dnl look for a section named .rel.dyn.
1517 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1518 libc_cv_z_combreloc=yes
1519 else
1520 libc_cv_z_combreloc=no
1521 fi
1522 else
1523 libc_cv_z_combreloc=no
1524 fi
1525 rm -f conftest*])
1526 if test "$libc_cv_z_combreloc" = yes; then
1527 AC_DEFINE(HAVE_Z_COMBRELOC)
1528 fi
1529 AC_SUBST(libc_cv_z_combreloc)
1531 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1532 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1533 AC_SUBST(libc_cv_z_execstack)
1535 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1536 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1537 ])
1539 AC_SUBST(libc_cv_fpie)
1541 AC_CACHE_CHECK(for --hash-style option,
1542 libc_cv_hashstyle, [dnl
1543 cat > conftest.c <<EOF
1544 int _start (void) { return 42; }
1545 EOF
1546 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1547 -fPIC -shared -o conftest.so conftest.c
1548 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1549 then
1550 libc_cv_hashstyle=yes
1551 else
1552 libc_cv_hashstyle=no
1553 fi
1554 rm -f conftest*])
1555 AC_SUBST(libc_cv_hashstyle)
1557 # The linker's default -shared behavior is good enough if it
1558 # does these things that our custom linker scripts ensure that
1559 # all allocated NOTE sections come first.
1560 if test "$use_default_link" = default; then
1561 AC_CACHE_CHECK([for sufficient default -shared layout],
1562 libc_cv_use_default_link, [dnl
1563 libc_cv_use_default_link=no
1564 cat > conftest.s <<\EOF
1565 .section .note.a,"a",%note
1566 .balign 4
1567 .long 4,4,9
1568 .string "GNU"
1569 .string "foo"
1570 .section .note.b,"a",%note
1571 .balign 4
1572 .long 4,4,9
1573 .string "GNU"
1574 .string "bar"
1575 EOF
1576 if AC_TRY_COMMAND([dnl
1577 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1578 ac_try=`$READELF -S conftest.so | sed -n \
1579 ['${x;p;}
1580 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1581 t a
1582 b
1583 : a
1584 H']`
1585 then
1586 libc_seen_a=no libc_seen_b=no
1587 set -- $ac_try
1588 while test $# -ge 2 -a "$1" = NOTE; do
1589 case "$2" in
1590 .note.a) libc_seen_a=yes ;;
1591 .note.b) libc_seen_b=yes ;;
1592 esac
1593 shift 2
1594 done
1595 case "$libc_seen_a$libc_seen_b" in
1596 yesyes)
1597 libc_cv_use_default_link=yes
1598 ;;
1599 *)
1600 echo >&AS_MESSAGE_LOG_FD "\
1601 $libc_seen_a$libc_seen_b from:
1602 $ac_try"
1603 ;;
1604 esac
1605 fi
1606 rm -f conftest*])
1607 use_default_link=$libc_cv_use_default_link
1608 fi
1610 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1611 if libc_cv_output_format=`
1612 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1613 then
1614 :
1615 else
1616 libc_cv_output_format=
1617 fi
1618 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1619 AC_SUBST(libc_cv_output_format)
1621 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1622 cat > conftest.c <<EOF
1623 int foo;
1624 EOF
1625 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1626 conftest.c 1>&AS_MESSAGE_LOG_FD])
1627 then
1628 libc_cv_fno_toplevel_reorder=yes
1629 else
1630 libc_cv_fno_toplevel_reorder=no
1631 fi
1632 rm -f conftest*])
1633 if test $libc_cv_fno_toplevel_reorder = yes; then
1634 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1635 else
1636 fno_unit_at_a_time=-fno-unit-at-a-time
1637 fi
1638 AC_SUBST(fno_unit_at_a_time)
1640 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1641 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1642 [libc_cv_ssp=yes],
1643 [libc_cv_ssp=no])
1644 ])
1645 AC_SUBST(libc_cv_ssp)
1647 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1648 cat > conftest.c <<EOF
1649 int foo;
1650 #ifdef __GNUC_GNU_INLINE__
1651 main () { return 0;}
1652 #else
1653 #error
1654 #endif
1655 EOF
1656 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1657 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1658 then
1659 libc_cv_gnu89_inline=yes
1660 else
1661 libc_cv_gnu89_inline=no
1662 fi
1663 rm -f conftest*])
1664 if test $libc_cv_gnu89_inline = yes; then
1665 gnu89_inline=-fgnu89-inline
1666 else
1667 gnu89_inline=
1668 fi
1669 AC_SUBST(gnu89_inline)
1671 AC_CACHE_CHECK(whether cc puts quotes around section names,
1672 libc_cv_have_section_quotes,
1673 [cat > conftest.c <<EOF
1674 static const int foo
1675 __attribute__ ((section ("bar"))) = 1;
1676 EOF
1677 if ${CC-cc} -S conftest.c -o conftest.s; then
1678 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1679 libc_cv_have_section_quotes=yes
1680 else
1681 libc_cv_have_section_quotes=no
1682 fi
1683 else
1684 libc_cv_have_section_quotes=unknown
1685 fi
1686 rm -f conftest.{c,s}
1687 ])
1688 if test $libc_cv_have_section_quotes = yes; then
1689 AC_DEFINE(HAVE_SECTION_QUOTES)
1690 fi
1692 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1693 [dnl
1694 cat > conftest.s <<EOF
1695 ${libc_cv_dot_text}
1696 .globl foo
1697 foo:
1698 .weak foo
1699 .weak bar; bar = foo
1700 EOF
1701 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1702 libc_cv_asm_weak_directive=yes
1703 else
1704 libc_cv_asm_weak_directive=no
1705 fi
1706 rm -f conftest*])
1708 if test $libc_cv_asm_weak_directive = no; then
1709 AC_CACHE_CHECK(for assembler .weakext directive,
1710 libc_cv_asm_weakext_directive,
1711 [dnl
1712 cat > conftest.s <<EOF
1713 ${libc_cv_dot_text}
1714 .globl foo
1715 foo:
1716 .weakext bar foo
1717 .weakext baz
1718 .globl baz
1719 baz:
1720 EOF
1721 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1722 libc_cv_asm_weakext_directive=yes
1723 else
1724 libc_cv_asm_weakext_directive=no
1725 fi
1726 rm -f conftest*])
1728 fi # no .weak
1730 if test $libc_cv_asm_weak_directive = yes; then
1731 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1732 elif test $libc_cv_asm_weakext_directive = yes; then
1733 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1734 fi
1736 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1737 case $machine in
1738 sparc/sparc64*) cfi_offset=2047;;
1739 *) cfi_offset=0;;
1740 esac
1741 cat > conftest.s <<EOF
1742 .text
1743 .type func,%function
1744 func:
1745 .cfi_startproc
1746 .cfi_remember_state
1747 .cfi_rel_offset 1, $cfi_offset
1748 .cfi_endproc
1749 EOF
1750 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1751 libc_cv_asm_cfi_directives=yes
1752 else
1753 libc_cv_asm_cfi_directives=no
1754 fi
1755 rm -f conftest*])
1756 if test $libc_cv_asm_cfi_directives = yes; then
1757 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1758 fi
1760 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1761 cat > conftest.c <<\EOF
1762 _start () {}
1763 int __eh_pc;
1764 __throw () {}
1765 EOF
1766 dnl No \ in command here because it ends up inside ''.
1767 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1768 -nostdlib -nostartfiles -Wl,--no-whole-archive
1769 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1770 libc_cv_ld_no_whole_archive=yes
1771 else
1772 libc_cv_ld_no_whole_archive=no
1773 fi
1774 rm -f conftest*])
1775 if test $libc_cv_ld_no_whole_archive = no; then
1776 AC_MSG_ERROR([support for --no-whole-archive is needed])
1777 fi
1779 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1780 cat > conftest.c <<\EOF
1781 _start () {}
1782 int __eh_pc;
1783 __throw () {}
1784 EOF
1785 dnl No \ in command here because it ends up inside ''.
1786 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1787 -nostdlib -nostartfiles -fexceptions
1788 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1789 libc_cv_gcc_exceptions=yes
1790 else
1791 libc_cv_gcc_exceptions=no
1792 fi
1793 rm -f conftest*])
1794 if test $libc_cv_gcc_exceptions = yes; then
1795 exceptions=-fexceptions
1796 fi
1797 AC_SUBST(exceptions)dnl
1799 if test "$host_cpu" = powerpc ; then
1800 # Check for a bug present in at least versions 2.8.x of GCC
1801 # and versions 1.0.x of EGCS.
1802 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1803 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1804 libc_cv_c_asmcr0_bug='no',
1805 libc_cv_c_asmcr0_bug='yes')])
1806 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1807 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1808 fi
1809 fi
1811 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1812 cat > conftest.c <<\EOF
1813 void zero (void *x)
1814 {
1815 __builtin_memset (x, 0, 1000);
1816 }
1817 EOF
1818 dnl
1819 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1820 then
1821 libc_cv_gcc_builtin_memset=no
1822 else
1823 libc_cv_gcc_builtin_memset=yes
1824 fi
1825 rm -f conftest* ])
1826 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1827 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1828 fi
1830 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1831 cat > conftest.c <<\EOF
1832 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1833 char *foo (const char *a, const char *b)
1834 {
1835 return __builtin_strstr (a, b);
1836 }
1837 EOF
1838 dnl
1839 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1840 then
1841 libc_cv_gcc_builtin_redirection=yes
1842 else
1843 libc_cv_gcc_builtin_redirection=no
1844 fi
1845 rm -f conftest* ])
1846 if test "$libc_cv_gcc_builtin_redirection" = no; then
1847 AC_MSG_ERROR([support for the symbol redirection needed])
1848 fi
1850 dnl Check whether the compiler supports the __thread keyword.
1851 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1852 [cat > conftest.c <<\EOF
1853 __thread int a = 42;
1854 EOF
1855 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1856 libc_cv_gcc___thread=yes
1857 else
1858 libc_cv_gcc___thread=no
1859 fi
1860 rm -f conftest*])
1861 if test "$libc_cv_gcc___thread" = no; then
1862 AC_MSG_ERROR([support for the __thread keyword is required])
1863 fi
1865 dnl Check whether the compiler supports the tls_model attribute.
1866 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1867 cat > conftest.c <<\EOF
1868 extern __thread int a __attribute__((tls_model ("initial-exec")));
1869 EOF
1870 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1871 libc_cv_gcc_tls_model_attr=yes
1872 else
1873 libc_cv_gcc_tls_model_attr=no
1874 fi
1875 rm -f conftest*])
1876 if test "$libc_cv_gcc_tls_model_attr" = no; then
1877 AC_MSG_ERROR([support for the tls_model attribute is required])
1878 fi
1880 dnl Determine how to disable generation of FMA instructions.
1881 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1882 libc_cv_cc_nofma, [dnl
1883 libc_cv_cc_nofma=
1884 for opt in -ffp-contract=off -mno-fused-madd; do
1885 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1886 done])
1887 AC_SUBST(libc_cv_cc_nofma)
1889 if test -n "$submachine"; then
1890 AC_CACHE_CHECK([for compiler option for CPU variant],
1891 libc_cv_cc_submachine, [dnl
1892 libc_cv_cc_submachine=no
1893 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1894 LIBC_TRY_CC_OPTION([$opt], [
1895 libc_cv_cc_submachine="$opt"
1896 break], [])
1897 done])
1898 if test "x$libc_cv_cc_submachine" = xno; then
1899 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1900 fi
1901 fi
1902 AC_SUBST(libc_cv_cc_submachine)
1904 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1905 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1906 cat > conftest.c <<EOF
1907 void
1908 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1909 foo (void) {}
1910 EOF
1911 libc_cv_cc_loop_to_function=no
1912 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1913 then
1914 libc_cv_cc_loop_to_function=yes
1915 fi
1916 rm -f conftest*])
1917 if test $libc_cv_cc_loop_to_function = yes; then
1918 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1919 fi
1920 AC_SUBST(libc_cv_cc_loop_to_function)
1922 dnl Check whether we have the gd library available.
1923 AC_MSG_CHECKING(for libgd)
1924 if test "$with_gd" != "no"; then
1925 old_CFLAGS="$CFLAGS"
1926 CFLAGS="$CFLAGS $libgd_include"
1927 old_LDFLAGS="$LDFLAGS"
1928 LDFLAGS="$LDFLAGS $libgd_ldflags"
1929 old_LIBS="$LIBS"
1930 LIBS="$LIBS -lgd -lpng -lz -lm"
1931 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1932 CFLAGS="$old_CFLAGS"
1933 LDFLAGS="$old_LDFLAGS"
1934 LIBS="$old_LIBS"
1935 else
1936 LIBGD=no
1937 fi
1938 AC_MSG_RESULT($LIBGD)
1939 AC_SUBST(LIBGD)
1941 # SELinux detection
1942 if test x$with_selinux = xno ; then
1943 have_selinux=no;
1944 else
1945 # See if we have the SELinux library
1946 AC_CHECK_LIB(selinux, is_selinux_enabled,
1947 have_selinux=yes, have_selinux=no)
1948 if test x$with_selinux = xyes ; then
1949 if test x$have_selinux = xno ; then
1950 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1951 fi
1952 fi
1953 fi
1954 # Check if we're building with SELinux support.
1955 if test "x$have_selinux" = xyes; then
1956 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1958 # See if we have the libaudit library
1959 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1960 have_libaudit=yes, have_libaudit=no)
1961 if test "x$have_libaudit" = xyes; then
1962 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1963 fi
1964 AC_SUBST(have_libaudit)
1966 # See if we have the libcap library
1967 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1968 if test "x$have_libcap" = xyes; then
1969 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1970 fi
1971 AC_SUBST(have_libcap)
1972 fi
1973 AC_SUBST(have_selinux)
1975 dnl check for the size of 'long double'.
1976 AC_CHECK_SIZEOF(long double, 0)
1977 sizeof_long_double=$ac_cv_sizeof_long_double
1978 AC_SUBST(sizeof_long_double)
1980 CPPUNDEFS=
1981 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1982 dnl Since we are building the implementations of the fortified functions here,
1983 dnl having the macro defined interacts very badly.
1984 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1985 [AC_TRY_COMPILE([], [
1986 #ifdef _FORTIFY_SOURCE
1987 # error bogon
1988 #endif],
1989 [libc_cv_predef_fortify_source=no],
1990 [libc_cv_predef_fortify_source=yes])])
1991 if test $libc_cv_predef_fortify_source = yes; then
1992 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1993 fi
1994 AC_SUBST(CPPUNDEFS)
1996 dnl Check for silly hacked compilers inserting -fstack-protector.
1997 dnl This breaks badly for the early startup code we compile, since
1998 dnl the compiled code can refer to a magic machine-dependent location
1999 dnl for the canary value before we have sufficient setup for that to
2000 dnl work. It's also questionable to build all of libc with this flag
2001 dnl even when you're doing that for most applications you build, since
2002 dnl libc's code is so heavily-used and performance-sensitive. If we
2003 dnl ever really want to make that work, it should be enabled explicitly
2004 dnl in the libc build, not inherited from implicit compiler settings.
2005 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2006 libc_cv_predef_stack_protector, [
2007 AC_TRY_COMPILE([extern void foobar (char *);],
2008 [char large_array[2048]; foobar (large_array);], [
2009 libc_undefs=`$NM -u conftest.o |
2010 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2011 2>&AS_MESSAGE_LOG_FD` || {
2012 AC_MSG_ERROR([confusing output from $NM -u])
2013 }
2014 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2015 # On some architectures, there are architecture-specific undefined
2016 # symbols (resolved by the linker), so filter out unknown symbols.
2017 # This will fail to produce the correct result if the compiler
2018 # defaults to -fstack-protector but this produces an undefined symbol
2019 # other than __stack_chk_fail. However, compilers like that have not
2020 # been encountered in practice.
2021 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2022 case "$libc_undefs" in
2023 foobar) libc_cv_predef_stack_protector=no ;;
2024 '__stack_chk_fail
2025 foobar') libc_cv_predef_stack_protector=yes ;;
2026 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2027 esac],
2028 [AC_MSG_ERROR([test compilation failed])])
2029 ])
2030 libc_extra_cflags=
2031 if test $libc_cv_predef_stack_protector = yes; then
2032 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
2033 fi
2034 libc_extra_cppflags=
2036 AC_CACHE_CHECK([whether the linker provides __ehdr_start],
2037 libc_cv_ehdr_start, [
2038 old_CFLAGS="$CFLAGS"
2039 old_LDFLAGS="$LDFLAGS"
2040 old_LIBS="$LIBS"
2041 CFLAGS="$CFLAGS -fPIC"
2042 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
2043 LIBS=
2044 AC_LINK_IFELSE([AC_LANG_SOURCE([
2045 extern const char __ehdr_start __attribute__ ((visibility ("hidden")));
2046 const char *ehdr (void) { return &__ehdr_start; }
2047 ])],
2048 [libc_cv_ehdr_start=yes], [libc_cv_ehdr_start=no])
2049 CFLAGS="$old_CFLAGS"
2050 LDFLAGS="$old_LDFLAGS"
2051 LIBS="$old_LIBS"
2052 ])
2053 if test $libc_cv_ehdr_start = yes; then
2054 AC_DEFINE([HAVE_EHDR_START])
2055 fi
2057 ### End of automated tests.
2058 ### Now run sysdeps configure fragments.
2060 # They also can set these variables.
2061 use_ldconfig=no
2062 ldd_rewrite_script=no
2063 libc_cv_sysconfdir=$sysconfdir
2064 libc_cv_localstatedir=$localstatedir
2065 libc_cv_gcc_unwind_find_fde=no
2066 libc_cv_idn=no
2068 # Iterate over all the sysdep directories we will use, running their
2069 # configure fragments.
2070 for dir in $sysnames; do
2071 case $dir in
2072 /*) dest=$dir ;;
2073 *) dest=$srcdir/$dir ;;
2074 esac
2075 if test -r $dest/configure; then
2076 AC_MSG_RESULT(running configure fragment for $dir)
2077 . $dest/configure
2078 fi
2079 done
2081 AC_SUBST(libc_extra_cflags)
2082 AC_SUBST(libc_extra_cppflags)
2084 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2085 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2086 fi
2087 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2089 # A sysdeps configure fragment can reset this if IFUNC is not actually
2090 # usable even though the assembler knows how to generate the symbol type.
2091 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2092 AC_DEFINE(HAVE_IFUNC)
2093 fi
2095 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2096 # configure fragment can override the value to prevent this AC_DEFINE.
2097 AC_SUBST(use_nscd)
2098 if test "x$use_nscd" != xno; then
2099 AC_DEFINE([USE_NSCD])
2100 fi
2101 if test "x$build_nscd" = xdefault; then
2102 build_nscd=$use_nscd
2103 fi
2105 # Test for old glibc 2.0.x headers so that they can be removed properly
2106 # Search only in includedir.
2107 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2108 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2109 then
2110 old_glibc_headers=yes
2111 else
2112 old_glibc_headers=no
2113 fi
2114 AC_MSG_RESULT($old_glibc_headers)
2115 if test ${old_glibc_headers} = yes; then
2116 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2117 AC_MSG_WARN(*** be removed.)
2118 fi
2119 AC_SUBST(old_glibc_headers)
2121 AC_SUBST(libc_cv_slibdir)
2122 AC_SUBST(libc_cv_rtlddir)
2123 AC_SUBST(libc_cv_localedir)
2124 AC_SUBST(libc_cv_sysconfdir)
2125 AC_SUBST(libc_cv_localstatedir)
2126 AC_SUBST(libc_cv_rootsbindir)
2127 AC_SUBST(libc_cv_forced_unwind)
2129 if test x$use_ldconfig = xyes; then
2130 AC_DEFINE(USE_LDCONFIG)
2131 fi
2132 AC_SUBST(use_ldconfig)
2133 AC_SUBST(ldd_rewrite_script)
2135 AC_SUBST(static)
2136 AC_SUBST(shared)
2138 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2139 [libc_cv_pic_default=yes
2140 cat > conftest.c <<EOF
2141 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2142 # error PIC is default.
2143 #endif
2144 EOF
2145 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2146 libc_cv_pic_default=no
2147 fi
2148 rm -f conftest.*])
2149 AC_SUBST(libc_cv_pic_default)
2151 AC_SUBST(profile)
2152 AC_SUBST(static_nss)
2154 AC_SUBST(DEFINES)
2156 dnl See sysdeps/mach/configure.ac for this variable.
2157 AC_SUBST(mach_interface_list)
2159 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2160 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2161 AC_SUBST(VERSION)
2162 AC_SUBST(RELEASE)
2164 AC_CONFIG_FILES([config.make Makefile])
2165 AC_CONFIG_COMMANDS([default],[[
2166 case $CONFIG_FILES in *config.make*)
2167 echo "$config_vars" >> config.make;;
2168 esac
2169 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2170 AC_OUTPUT