| blob | a7f9881349ae40b058e0535a8a1c6bd59946c546 |
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=$enableval],
231 [force_install=yes])
232 AC_SUBST(force_install)
234 dnl On some platforms we allow dropping compatibility with all kernel
235 dnl versions.
236 AC_ARG_ENABLE([kernel],
237 AC_HELP_STRING([--enable-kernel=VERSION],
238 [compile for compatibility with kernel not older than VERSION]),
239 [minimum_kernel=$enableval],
240 [])
241 dnl Prevent unreasonable values.
242 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
243 # Better nothing than this.
244 minimum_kernel=""
245 else
246 if test "$minimum_kernel" = current; then
247 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
248 fi
249 fi
251 dnl For the development we sometimes want gcc to issue even more warnings.
252 dnl This is not the default since many of the extra warnings are not
253 dnl appropriate.
254 AC_ARG_ENABLE([all-warnings],
255 AC_HELP_STRING([--enable-all-warnings],
256 [enable all useful warnings gcc can issue]),
257 [all_warnings=$enableval],
258 [])
259 AC_SUBST(all_warnings)
261 AC_ARG_ENABLE([multi-arch],
262 AC_HELP_STRING([--enable-multi-arch],
263 [enable single DSO with optimizations for multiple architectures]),
264 [multi_arch=$enableval],
265 [multi_arch=default])
267 AC_ARG_ENABLE([nss-crypt],
268 AC_HELP_STRING([--enable-nss-crypt],
269 [enable libcrypt to use nss]),
270 [nss_crypt=$enableval],
271 [nss_crypt=no])
272 if test x$nss_crypt = xyes; then
273 nss_includes=-I$(nss-config --includedir 2>/dev/null)
274 if test $? -ne 0; then
275 AC_MSG_ERROR([cannot find include directory with nss-config])
276 fi
277 old_CFLAGS="$CFLAGS"
278 CFLAGS="$CFLAGS $nss_includes"
279 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
280 #include <hasht.h>
281 #include <nsslowhash.h>
282 void f (void) { NSSLOW_Init (); }])],
283 libc_cv_nss_crypt=yes,
284 AC_MSG_ERROR([
285 cannot find NSS headers with lowlevel hash function interfaces]))
286 old_LIBS="$LIBS"
287 LIBS="$LIBS -lfreebl3"
288 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
289 #include <hasht.h>
290 #include <nsslowhash.h>],
291 [NSSLOW_Init();])],
292 libc_cv_nss_crypt=yes,
293 AC_MSG_ERROR([
294 cannot link program using lowlevel NSS hash functions]))
295 CFLAGS="$old_CFLAGS"
296 LIBS="$old_LIBS"
297 else
298 libc_cv_nss_crypt=no
299 fi
300 AC_SUBST(libc_cv_nss_crypt)
303 AC_ARG_ENABLE([obsolete-rpc],
304 AC_HELP_STRING([--enable-obsolete-rpc],
305 [build and install the obsolete RPC code for link-time usage]),
306 [link_obsolete_rpc=$enableval],
307 [link_obsolete_rpc=no])
308 AC_SUBST(link_obsolete_rpc)
310 if test "$link_obsolete_rpc" = yes; then
311 AC_DEFINE(LINK_OBSOLETE_RPC)
312 fi
314 AC_ARG_ENABLE([systemtap],
315 [AS_HELP_STRING([--enable-systemtap],
316 [enable systemtap static probe points @<:@default=no@:>@])],
317 [systemtap=$enableval],
318 [systemtap=no])
319 if test "x$systemtap" != xno; then
320 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
321 old_CFLAGS="$CFLAGS"
322 CFLAGS="-std=gnu99 $CFLAGS"
323 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
324 void foo (int i, void *p)
325 {
326 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
327 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
328 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
329 CFLAGS="$old_CFLAGS"])
330 if test $libc_cv_sdt = yes; then
331 AC_DEFINE([USE_STAP_PROBE])
332 elif test "x$systemtap" != xauto; then
333 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
334 fi
335 fi
337 AC_ARG_ENABLE([build-nscd],
338 [AS_HELP_STRING([--disable-build-nscd],
339 [disable building and installing the nscd daemon])],
340 [build_nscd=$enableval],
341 [build_nscd=default])
342 AC_SUBST(build_nscd)
344 # Note the use of $use_nscd is near the bottom of the file.
345 AC_ARG_ENABLE([nscd],
346 [AS_HELP_STRING([--disable-nscd],
347 [library functions will not contact the nscd daemon])],
348 [use_nscd=$enableval],
349 [use_nscd=yes])
351 AC_ARG_ENABLE([pt_chown],
352 [AS_HELP_STRING([--enable-pt_chown],
353 [Enable building and installing pt_chown])],
354 [build_pt_chown=$enableval],
355 [build_pt_chown=no])
356 AC_SUBST(build_pt_chown)
357 if test "$build_pt_chown" = yes; then
358 AC_DEFINE(HAVE_PT_CHOWN)
359 fi
361 # The way shlib-versions is used to generate soversions.mk uses a
362 # fairly simplistic model for name recognition that can't distinguish
363 # i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a $host_os
364 # of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
365 # tell. This doesn't get used much beyond that, so it's fairly safe.
366 case "$host_os" in
367 linux*)
368 ;;
369 gnu*)
370 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
371 ;;
372 esac
374 # We keep the original values in `$config_*' and never modify them, so we
375 # can write them unchanged into config.make. Everything else uses
376 # $machine, $vendor, and $os, and changes them whenever convenient.
377 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
379 # Don't allow vendor == "unknown"
380 test "$config_vendor" = unknown && config_vendor=
381 config_os="`echo $config_os | sed 's/^unknown-//'`"
383 # Some configurations imply other options.
384 elf=yes
386 # The configure fragment of an add-on port can modify these to supplement
387 # or override the table in the case statement below. No fragment should
388 # ever change the config_* variables, however.
389 machine=$config_machine
390 vendor=$config_vendor
391 os=$config_os
392 base_os=''
394 # config.guess on some IBM machines says `rs6000' instead of `powerpc'.
395 # Unify this here.
396 if test "$machine" = rs6000; then
397 machine="powerpc"
398 fi
400 # Braindead PowerPC box with absolutely no FPU.
401 case "$machine-$host_os" in
402 powerpc*-*soft)
403 with_fp=no
404 ;;
405 esac
407 submachine=
408 AC_ARG_WITH([cpu],
409 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
410 [dnl
411 case "$withval" in
412 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
413 no) ;;
414 *) submachine="$withval" ;;
415 esac
416 ])
418 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
419 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
421 # An add-on can set this when it wants to disable the sanity check below.
422 libc_config_ok=no
424 dnl Having this here, though empty, makes sure that if add-ons' fragments
425 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
426 dnl our AC_OUTPUT will actually use it.
427 AC_CONFIG_SUBDIRS()
429 case "$enable_add_ons" in
430 ''|no) add_ons= ;;
431 yes|'*')
432 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
433 sed 's@/[[^/]]*$@@' | sort | uniq`
434 add_ons_automatic=yes
435 ;;
436 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
437 add_ons_automatic=no ;;
438 esac
440 configured_add_ons=
441 add_ons_sfx=
442 add_ons_pfx=
443 if test x"$add_ons" != x; then
444 for f in $add_ons; do
445 # Some sanity checks
446 case "$f" in
447 crypt)
448 AC_MSG_ERROR([
449 *** It seems that you're using an old \`crypt' add-on. crypt is now
450 *** part of glibc and using the old add-on will not work with this
451 *** release. Start again with fresh sources and without the old
452 *** \`crypt' add-on.])
453 ;;
454 localedata)
455 AC_MSG_ERROR([
456 *** It seems that you're using an old \`localedata' add-on. localedata
457 *** is now part of glibc and using the old add-on will not work with
458 *** this release. Start again with fresh sources and without the old
459 *** \`localedata' add-on.])
460 ;;
461 esac
462 done
464 # Now source each add-on's configure fragment.
465 # The fragments can use $srcdir/$libc_add_on to find themselves,
466 # and test $add_ons_automatic to see if they were explicitly requested.
467 # A fragment can clear (or even change) $libc_add_on to affect
468 # whether it goes into the list to be actually used in the build.
469 use_add_ons=
470 for libc_add_on in $add_ons; do
471 # Test whether such a directory really exists.
472 # It can be absolute, or relative to $srcdir, or relative to the build dir.
473 case "$libc_add_on" in
474 /*)
475 libc_add_on_srcdir=$libc_add_on
476 ;;
477 *)
478 test -d "$srcdir/$libc_add_on" || {
479 if test -d "$libc_add_on"; then
480 libc_add_on="`pwd`/$libc_add_on"
481 else
482 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
483 fi
484 }
485 libc_add_on_srcdir=$srcdir/$libc_add_on
486 ;;
487 esac
489 libc_add_on_frag=$libc_add_on_srcdir/configure
490 libc_add_on_canonical=
491 libc_add_on_config_subdirs=
492 if test -r "$libc_add_on_frag"; then
493 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
494 libc_add_on_canonical=unknown
495 libc_add_on_subdirs=
496 . "$libc_add_on_frag"
497 test -z "$libc_add_on" || {
498 configured_add_ons="$configured_add_ons $libc_add_on"
499 if test "x$libc_add_on_canonical" = xunknown; then
500 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
501 fi
502 for d in $libc_add_on_subdirs; do
503 case "$libc_add_on" in
504 /*) subdir_srcdir="$libc_add_on" ;;
505 *) subdir_srcdir="\$(..)$libc_add_on" ;;
506 esac
507 case "$d" in
508 .)
509 d="${libc_add_on_canonical:-$libc_add_on}"
510 ;;
511 /*)
512 subdir_srcdir="$d"
513 ;;
514 *)
515 subdir_srcdir="$subdir_srcdir/$d"
516 ;;
517 esac
518 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
519 add_on_subdirs="$add_on_subdirs $d"
520 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
521 $d-srcdir = $subdir_srcdir"
522 done
523 for d in $libc_add_on_config_subdirs; do
524 case "$d" in
525 /*) AC_MSG_ERROR(dnl
526 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
527 esac
528 if test ! -d "$libc_add_on_srcdir/$d"; then
529 AC_MSG_ERROR(fragment wants to configure missing directory $d)
530 fi
531 case "$libc_add_on" in
532 /*) AC_MSG_ERROR(dnl
533 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
534 esac
535 subdirs="$subdirs $libc_add_on/$d"
536 done
537 }
538 fi
539 if test -n "$libc_add_on"; then
540 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
541 use_add_ons="$use_add_ons $libc_add_on"
542 add_ons_pfx="$add_ons_pfx $libc_add_on/"
543 test -z "$libc_add_on_canonical" ||
544 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
545 fi
546 done
547 # Use echo to strip excess whitespace.
548 add_ons="`echo $use_add_ons`"
549 fi
550 AC_SUBST(add_ons)
551 AC_SUBST(add_on_subdirs)
554 ###
555 ### I put this here to prevent those annoying emails from people who cannot
556 ### read and try to compile glibc on unsupported platforms. --drepper
557 ###
558 ### By using the undocumented --enable-hacker-mode option for configure
559 ### one can skip this test to make the configuration not fail for unsupported
560 ### platforms.
561 ###
562 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
563 case "$machine-$host_os" in
564 *-linux* | *-gnu*)
565 ;;
566 *)
567 echo "*** The GNU C library is currently not available for this platform."
568 echo "*** So far nobody cared to port it and if there is no volunteer it"
569 echo "*** might never happen. So, if you have interest to see glibc on"
570 echo "*** this platform visit"
571 echo "*** http://www.gnu.org/software/libc/porting.html"
572 echo "*** and join the group of porters"
573 exit 1
574 ;;
575 esac
576 fi
578 dnl We need to use [ and ] for other purposes for a while now.
579 changequote(,)dnl
580 # Expand the configuration machine name into a subdirectory by architecture
581 # type and particular chip. If an add-on configure fragment already set
582 # base_machine, we don't change it.
583 test -n "$base_machine" || case "$machine" in
584 i[4567]86) base_machine=i386 machine=i386/$machine ;;
585 powerpc64*) base_machine=powerpc machine=powerpc/powerpc64 ;;
586 powerpc*) base_machine=powerpc machine=powerpc/powerpc32 ;;
587 s390) base_machine=s390 machine=s390/s390-32 ;;
588 s390x) base_machine=s390 machine=s390/s390-64 ;;
589 sh3*) base_machine=sh machine=sh/sh3 ;;
590 sh4*) base_machine=sh machine=sh/sh4 ;;
591 sparc | sparcv[67])
592 base_machine=sparc machine=sparc/sparc32 ;;
593 sparcv8 | supersparc | hypersparc)
594 base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
595 sparcv8plus | sparcv8plusa | sparcv9)
596 base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
597 sparcv8plusb | sparcv9b)
598 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
599 sparcv9v)
600 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
601 sparcv9v2)
602 base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
603 sparc64)
604 base_machine=sparc machine=sparc/sparc64 ;;
605 sparc64b)
606 base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
607 sparc64v)
608 base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
609 sparc64v2)
610 base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
611 *) base_machine=$machine ;;
612 esac
613 changequote([,])dnl
614 AC_SUBST(base_machine)
616 if test "$base_machine" = "i386"; then
617 AC_DEFINE(USE_REGPARMS)
618 fi
620 # For the multi-arch option we need support in the assembler & linker.
621 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
622 libc_cv_ld_gnu_indirect_function, [dnl
623 cat > conftest.S <<EOF
624 .type foo,%gnu_indirect_function
625 foo:
626 .globl _start
627 _start:
628 .globl __start
629 __start:
630 .data
631 #ifdef _LP64
632 .quad foo
633 #else
634 .long foo
635 #endif
636 EOF
637 libc_cv_ld_gnu_indirect_function=no
638 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
639 -nostartfiles -nostdlib \
640 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
641 # Do a link to see if the backend supports IFUNC relocs.
642 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
643 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
644 libc_cv_ld_gnu_indirect_function=yes
645 }
646 fi
647 rm -f conftest*])
649 AC_MSG_CHECKING(whether .text pseudo-op must be used)
650 AC_CACHE_VAL(libc_cv_dot_text, [dnl
651 cat > conftest.s <<EOF
652 .text
653 EOF
654 libc_cv_dot_text=
655 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
656 libc_cv_dot_text=.text
657 fi
658 rm -f conftest*])
659 if test -z "$libc_cv_dot_text"; then
660 AC_MSG_RESULT(no)
661 else
662 AC_MSG_RESULT(yes)
663 fi
665 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
666 if test x"$multi_arch" = xyes; then
667 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
668 else
669 multi_arch=no
670 fi
671 fi
672 multi_arch_d=
673 if test x"$multi_arch" != xno; then
674 multi_arch_d=/multiarch
675 fi
677 # Compute the list of sysdep directories for this configuration.
678 # This can take a while to compute.
679 sysdep_dir=$srcdir/sysdeps
680 AC_MSG_CHECKING(sysdep dirs)
681 dnl We need to use [ and ] for other purposes for a while now.
682 changequote(,)dnl
683 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
684 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
686 test "x$base_os" != x || case "$os" in
687 gnu*)
688 base_os=mach/hurd ;;
689 linux*)
690 base_os=unix/sysv ;;
691 esac
693 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
694 tail=$os
695 ostry=$os
696 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
697 ostry="$ostry /$o"
698 tail=$o
699 done
700 o=`echo $tail | sed 's/[0-9]*$//'`
701 if test $o != $tail; then
702 ostry="$ostry /$o"
703 fi
704 # For linux-gnu, try linux-gnu, then linux.
705 o=`echo $tail | sed 's/-.*$//'`
706 if test $o != $tail; then
707 ostry="$ostry /$o"
708 fi
710 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
711 base=
712 tail=$base_os
713 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
714 set $b
715 base="$base /$1"
716 tail="$2"
717 done
719 # For sparc/sparc32, try sparc/sparc32 and then sparc.
720 mach=
721 tail=$machine${submachine:+/$submachine}
722 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
723 set $m
724 # Prepend the machine's FPU directory unless --without-fp.
725 if test "$with_fp" = yes; then
726 maybe_fpu=/fpu
727 else
728 maybe_fpu=/nofpu
729 fi
730 # For each machine term, try it with and then without /multiarch.
731 for try_fpu in $maybe_fpu ''; do
732 for try_multi in $multi_arch_d ''; do
733 mach="$mach /$1$try_fpu$try_multi"
734 done
735 done
736 tail="$2"
737 done
739 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
740 changequote([,])dnl
742 # Find what sysdep directories exist.
743 sysnames_add_ons=
744 sysnames=
745 for b in $base ''; do
746 for m0 in $mach ''; do
747 for v in /$vendor ''; do
748 test "$v" = / && continue
749 for o in /$ostry ''; do
750 test "$o" = / && continue
751 for m in $mach ''; do
752 for d in $add_ons_pfx ''; do
753 for a in $add_ons_sfx ''; do
754 try_suffix="$m0$b$v$o$m"
755 if test -n "$try_suffix"; then
756 try_srcdir="${srcdir}/"
757 case "$d" in
758 /*) try_srcdir= ;;
759 esac
760 try="${d}sysdeps$try_suffix$a"
761 test -n "$enable_debug_configure" &&
762 echo "$0 [DEBUG]: try $try" >&2
763 if test -d "$try_srcdir$try"; then
764 sysnames="$sysnames $try"
765 { test -n "$o" || test -n "$b"; } && os_used=t
766 { test -n "$m" || test -n "$m0"; } && machine_used=t
767 case x${m0:-$m} in
768 x*/$submachine) submachine_used=t ;;
769 esac
770 if test -n "$d"; then
771 case "$sysnames_add_ons" in
772 *" $d "*) ;;
773 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
774 esac
775 fi
776 fi
777 fi
778 done
779 done
780 done
781 done
782 done
783 done
784 done
786 # If the assembler supports gnu_indirect_function symbol type and the
787 # architecture supports multi-arch, we enable multi-arch by default.
788 case $sysnames_add_ons$sysnames in
789 *"$multi_arch_d"*)
790 ;;
791 *)
792 test x"$multi_arch" = xdefault && multi_arch=no
793 ;;
794 esac
795 if test x"$multi_arch" != xno; then
796 AC_DEFINE(USE_MULTIARCH)
797 fi
798 AC_SUBST(multi_arch)
800 if test -z "$os_used" && test "$os" != none; then
801 AC_MSG_ERROR(Operating system $os is not supported.)
802 fi
803 if test -z "$machine_used" && test "$machine" != none; then
804 AC_MSG_ERROR(The $machine is not supported.)
805 fi
806 if test -z "$submachine_used" && test -n "$submachine"; then
807 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
808 fi
809 AC_SUBST(submachine)
811 # We have now validated the configuration.
813 # Expand the list of system names into a full list of directories
814 # from each element's parent name and Implies file (if present).
815 set $sysnames
816 names=
817 while test $# -gt 0; do
818 name=$1
819 shift
821 case " $names " in *" $name "*)
822 # Already in the list.
823 continue
824 esac
826 # Report each name as we discover it, so there is no long pause in output.
827 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
829 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
831 case $name in
832 /*) xsrcdir= ;;
833 *) xsrcdir=$srcdir/ ;;
834 esac
835 test -n "$enable_debug_configure" &&
836 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
838 for implies_file in Implies Implies-before Implies-after; do
839 implies_type=`echo $implies_file | sed s/-/_/`
840 eval ${implies_type}=
841 if test -f $xsrcdir$name/$implies_file; then
842 # Collect more names from the `Implies' file (removing comments).
843 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
844 for x in $implied_candidate; do
845 found=no
846 if test -d $xsrcdir$name_base/$x; then
847 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
848 found=yes
849 fi
850 for d in $add_ons_pfx ''; do
851 try="${d}sysdeps/$x"
852 case $d in
853 /*) try_srcdir= ;;
854 *) try_srcdir=$srcdir/ ;;
855 esac
856 test -n "$enable_debug_configure" &&
857 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
858 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
859 then
860 eval "${implies_type}=\"\$${implies_type} \$try\""
861 found=yes
862 case "$sysnames_add_ons" in
863 *" $d "*) ;;
864 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
865 esac
866 fi
867 done
868 if test $found = no; then
869 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
870 fi
871 done
872 fi
873 done
875 # Add NAME to the list of names.
876 names="$names $name"
878 # Find the parent of NAME, using the empty string if it has none.
879 changequote(,)dnl
880 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
881 changequote([,])dnl
883 test -n "$enable_debug_configure" &&
884 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
885 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
887 # Add the names implied by NAME, and NAME's parent (if it has one), to
888 # the list of names to be processed (the argument list). We prepend the
889 # implied names to the list and append the parent. We want implied
890 # directories to come before further directories inferred from the
891 # configuration components; this ensures that for sysv4, unix/common
892 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
893 # after sysv4).
894 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
895 test -n "$sysnames" && set $sysnames
896 done
898 # Add the default directories.
899 default_sysnames="sysdeps/generic"
900 sysnames="$names $default_sysnames"
901 AC_SUBST(sysnames)
902 # The other names were emitted during the scan.
903 AC_MSG_RESULT($default_sysnames)
905 # Collect the list of add-ons that supply partial sysdeps trees.
906 sysdeps_add_ons=
907 for add_on in $add_ons; do
908 case "$add_on" in
909 /*) xsrcdir= ;;
910 *) xsrcdir="$srcdir/" ;;
911 esac
913 test -d "$xsrcdir$add_on/sysdeps" || {
914 case "$configured_add_ons " in
915 *" $add_on "*) ;;
916 *|'')
917 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
918 ;;
919 esac
920 continue
921 }
923 sysdeps_add_ons="$sysdeps_add_ons $add_on"
924 case "$sysnames_add_ons" in
925 *" $add_on/ "*) ;;
926 *|'')
927 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
928 continue ;;
929 esac
931 found=no
932 for d in $sysnames; do
933 case "$d" in
934 $add_on/sysdeps/*) ;;
935 *) continue ;;
936 esac
937 (cd "$xsrcdir$d" && for f in *[[!~]]; do
938 case "$f" in
939 sys|bits)
940 for ff in $f/*.h; do
941 test -d "$ff" || { test -e "$ff" && exit 88; }
942 done
943 ;;
944 *)
945 test -d "$f" || { test -e "$f" && exit 88; }
946 ;;
947 esac
948 done)
949 if test $? -eq 88; then
950 found=yes
951 break
952 fi
953 done
954 if test $found = no; then
955 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
956 fi
957 done
958 AC_SUBST(sysdeps_add_ons)
961 ### Locate tools.
963 AC_PROG_INSTALL
964 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
965 # The makefiles need to use a different form to find it in $srcdir.
966 INSTALL='\$(..)./scripts/install-sh -c'
967 fi
968 AC_PROG_LN_S
970 LIBC_PROG_BINUTILS
972 # Accept binutils 2.20 or newer.
973 AC_CHECK_PROG_VER(AS, $AS, --version,
974 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
975 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
976 AC_CHECK_PROG_VER(LD, $LD, --version,
977 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
978 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
980 # These programs are version sensitive.
981 AC_CHECK_TOOL_PREFIX
982 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
983 [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
984 critic_missing="$critic_missing gcc")
985 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
986 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
987 [3.79* | 3.[89]*], critic_missing="$critic_missing make")
989 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
990 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
991 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
992 MSGFMT=: aux_missing="$aux_missing msgfmt")
993 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
994 [GNU texinfo.* \([0-9][0-9.]*\)],
995 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
996 MAKEINFO=: aux_missing="$aux_missing makeinfo")
997 AC_CHECK_PROG_VER(SED, sed, --version,
998 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
999 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1000 SED=: aux_missing="$aux_missing sed")
1001 AC_CHECK_PROG_VER(AWK, gawk, --version,
1002 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1003 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1005 AC_CHECK_TOOL(NM, nm, false)
1007 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1008 case "x$AUTOCONF" in
1009 xno|x|x:) AUTOCONF=no ;;
1010 *)
1011 AC_CACHE_CHECK(dnl
1012 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1013 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.in > /dev/null 2>&1); then
1014 libc_cv_autoconf_works=yes
1015 else
1016 libc_cv_autoconf_works=no
1017 fi])
1018 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1019 ;;
1020 esac
1021 if test "x$AUTOCONF" = xno; then
1022 aux_missing="$aux_missing autoconf"
1023 fi
1025 test -n "$critic_missing" && AC_MSG_ERROR([
1026 *** These critical programs are missing or too old:$critic_missing
1027 *** Check the INSTALL file for required versions.])
1029 test -n "$aux_missing" && AC_MSG_WARN([
1030 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1031 *** some features will be disabled.
1032 *** Check the INSTALL file for required versions.])
1034 # if using special system headers, find out the compiler's sekrit
1035 # header directory and add that to the list. NOTE: Only does the right
1036 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1037 if test -n "$sysheaders"; then
1038 SYSINCLUDES=-nostdinc
1039 for d in include include-fixed; do
1040 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1041 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1042 done
1043 SYSINCLUDES="$SYSINCLUDES \
1044 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1045 if test -n "$CXX"; then
1046 CXX_SYSINCLUDES=
1047 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1048 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1049 test "x$cxxheaders" != x &&
1050 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1051 done
1052 fi
1053 fi
1054 AC_SUBST(SYSINCLUDES)
1055 AC_SUBST(CXX_SYSINCLUDES)
1057 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1058 # since this would lead to problems installing/building glibc.
1059 # LD_LIBRARY_PATH contains the current directory if one of the following
1060 # is true:
1061 # - one of the terminals (":" and ";") is the first or last sign
1062 # - two terminals occur directly after each other
1063 # - the path contains an element with a dot in it
1064 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1065 changequote(,)dnl
1066 case ${LD_LIBRARY_PATH} in
1067 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1068 ld_library_path_setting="contains current directory"
1069 ;;
1070 *)
1071 ld_library_path_setting="ok"
1072 ;;
1073 esac
1074 changequote([,])dnl
1075 AC_MSG_RESULT($ld_library_path_setting)
1076 if test "$ld_library_path_setting" != "ok"; then
1077 AC_MSG_ERROR([
1078 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1079 *** building glibc. Please change the environment variable
1080 *** and run configure again.])
1081 fi
1083 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1084 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1085 libc_cv_gcc_static_libgcc=
1086 else
1087 libc_cv_gcc_static_libgcc=-static-libgcc
1088 fi])
1089 AC_SUBST(libc_cv_gcc_static_libgcc)
1091 AC_PATH_PROG(BASH_SHELL, bash, no)
1092 if test "$BASH_SHELL" != no &&
1093 $BASH_SHELL -c 'test "$BASH_VERSINFO" \
1094 && test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
1095 libc_cv_have_bash2=yes
1096 else
1097 libc_cv_have_bash2=no
1098 fi
1099 AC_SUBST(libc_cv_have_bash2)
1101 dnl We need a ksh compatible shell for tzselect.
1102 if test "$BASH_SHELL" = no; then
1103 AC_PATH_PROG(KSH, ksh, no)
1104 if test "$KSH" = no; then
1105 libc_cv_have_ksh=no
1106 else
1107 libc_cv_have_ksh=yes
1108 fi
1109 else
1110 KSH="$BASH_SHELL"
1111 AC_SUBST(KSH)
1112 libc_cv_have_ksh=yes
1113 fi
1114 AC_SUBST(libc_cv_have_ksh)
1116 AC_PATH_PROG(PERL, perl, no)
1117 if test "$PERL" != no &&
1118 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1119 PERL=no
1120 fi
1121 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1122 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1123 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1125 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1126 AC_TRY_COMPILE(dnl
1127 [#define __need_size_t
1128 #define __need_wchar_t
1129 #include <stddef.h>
1130 #define __need_NULL
1131 #include <stddef.h>], [size_t size; wchar_t wchar;
1132 #ifdef offsetof
1133 #error stddef.h ignored __need_*
1134 #endif
1135 if (&size == NULL || &wchar == NULL) abort ();],
1136 libc_cv_friendly_stddef=yes,
1137 libc_cv_friendly_stddef=no)])
1138 if test $libc_cv_friendly_stddef = yes; then
1139 config_vars="$config_vars
1140 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1141 fi
1143 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1144 libc_cv_need_minus_P, [dnl
1145 cat > conftest.S <<EOF
1146 #include "confdefs.h"
1147 /* Nothing whatsoever. */
1148 EOF
1149 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1150 libc_cv_need_minus_P=no
1151 else
1152 libc_cv_need_minus_P=yes
1153 fi
1154 rm -f conftest*])
1155 if test $libc_cv_need_minus_P = yes; then
1156 config_vars="$config_vars
1157 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1158 fi
1160 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1161 cat > conftest.s <<EOF
1162 ${libc_cv_dot_text}
1163 foo:
1164 .set glibc_conftest_frobozz,foo
1165 .globl glibc_conftest_frobozz
1166 EOF
1167 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1168 # (but it doesn't work), so we must do a linking check to be sure.
1169 cat > conftest1.c <<\EOF
1170 extern int glibc_conftest_frobozz;
1171 void _start() { glibc_conftest_frobozz = 1; }
1172 EOF
1173 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1174 -nostartfiles -nostdlib \
1175 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1176 libc_cv_asm_set_directive=yes
1177 else
1178 libc_cv_asm_set_directive=no
1179 fi
1180 rm -f conftest*])
1181 if test $libc_cv_asm_set_directive = yes; then
1182 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1183 fi
1185 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1186 libc_cv_asm_unique_object, [dnl
1187 cat > conftest.s <<EOF
1188 ${libc_cv_dot_text}
1189 _sym:
1190 .type _sym, %gnu_unique_object
1191 EOF
1192 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1193 libc_cv_asm_unique_object=yes
1194 else
1195 libc_cv_asm_unique_object=no
1196 fi
1197 rm -f conftest*])
1198 if test $libc_cv_asm_unique_object = yes; then
1199 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1200 fi
1202 AC_CACHE_CHECK(for .previous assembler directive,
1203 libc_cv_asm_previous_directive, [dnl
1204 cat > conftest.s <<EOF
1205 .section foo_section
1206 .previous
1207 EOF
1208 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1209 libc_cv_asm_previous_directive=yes
1210 else
1211 libc_cv_asm_previous_directive=no
1212 fi
1213 rm -f conftest*])
1214 if test $libc_cv_asm_previous_directive = yes; then
1215 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1216 else
1217 AC_CACHE_CHECK(for .popsection assembler directive,
1218 libc_cv_asm_popsection_directive, [dnl
1219 cat > conftest.s <<EOF
1220 .pushsection foo_section
1221 .popsection
1222 EOF
1223 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1224 libc_cv_asm_popsection_directive=yes
1225 else
1226 libc_cv_asm_popsection_directive=no
1227 fi
1228 rm -f conftest*])
1229 if test $libc_cv_asm_popsection_directive = yes; then
1230 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1231 fi
1232 fi
1233 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1234 libc_cv_asm_protected_directive, [dnl
1235 cat > conftest.s <<EOF
1236 .protected foo
1237 foo:
1238 .hidden bar
1239 bar:
1240 EOF
1241 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1242 libc_cv_asm_protected_directive=yes
1243 else
1244 AC_MSG_ERROR(assembler support for symbol visibility is required)
1245 fi
1246 rm -f conftest*])
1248 if test $libc_cv_asm_protected_directive = yes; then
1249 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1250 libc_cv_visibility_attribute,
1251 [cat > conftest.c <<EOF
1252 int foo __attribute__ ((visibility ("hidden"))) = 1;
1253 int bar __attribute__ ((visibility ("protected"))) = 1;
1254 EOF
1255 libc_cv_visibility_attribute=no
1256 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1257 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1258 if grep '\.protected.*bar' conftest.s >/dev/null; then
1259 libc_cv_visibility_attribute=yes
1260 fi
1261 fi
1262 fi
1263 rm -f conftest.{c,s}
1264 ])
1265 if test $libc_cv_visibility_attribute != yes; then
1266 AC_MSG_ERROR(compiler support for visibility attribute is required)
1267 fi
1268 fi
1270 if test $libc_cv_visibility_attribute = yes; then
1271 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1272 libc_cv_broken_visibility_attribute,
1273 [cat > conftest.c <<EOF
1274 int foo (int x);
1275 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1276 int bar (int x) { return x; }
1277 EOF
1278 libc_cv_broken_visibility_attribute=yes
1279 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1280 changequote(,)dnl
1281 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1282 changequote([,])dnl
1283 libc_cv_broken_visibility_attribute=no
1284 fi
1285 fi
1286 rm -f conftest.c conftest.s
1287 ])
1288 if test $libc_cv_broken_visibility_attribute = yes; then
1289 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1290 fi
1291 fi
1293 AC_CACHE_CHECK(for broken __attribute__((alias())),
1294 libc_cv_broken_alias_attribute,
1295 [cat > conftest.c <<EOF
1296 extern int foo (int x) __asm ("xyzzy");
1297 int bar (int x) { return x; }
1298 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1299 extern int dfoo;
1300 extern __typeof (dfoo) dfoo __asm ("abccb");
1301 int dfoo = 1;
1302 EOF
1303 libc_cv_broken_alias_attribute=yes
1304 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1305 if grep 'xyzzy' conftest.s >/dev/null &&
1306 grep 'abccb' conftest.s >/dev/null; then
1307 libc_cv_broken_alias_attribute=no
1308 fi
1309 fi
1310 rm -f conftest.c conftest.s
1311 ])
1312 if test $libc_cv_broken_alias_attribute = yes; then
1313 AC_MSG_ERROR(working alias attribute support required)
1314 fi
1316 if test $libc_cv_visibility_attribute = yes; then
1317 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1318 libc_cv_have_sdata_section,
1319 [echo "int i;" > conftest.c
1320 libc_cv_have_sdata_section=no
1321 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1322 | grep '\.sdata' >/dev/null; then
1323 libc_cv_have_sdata_section=yes
1324 fi
1325 rm -f conftest.c conftest.so
1326 ])
1327 if test $libc_cv_have_sdata_section = yes; then
1328 AC_DEFINE(HAVE_SDATA_SECTION)
1329 fi
1330 fi
1332 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1333 libc_cv_initfini_array, [dnl
1334 LIBC_TRY_LINK_STATIC([
1335 int foo (void) { return 1; }
1336 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1337 ],
1338 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1339 libc_cv_initfini_array=yes
1340 else
1341 libc_cv_initfini_array=no
1342 fi],
1343 [libc_cv_initfini_array=no])
1344 ])
1345 if test $libc_cv_initfini_array != yes; then
1346 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1347 fi
1349 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1350 libc_cv_ctors_header, [dnl
1351 libc_cv_ctors_header=yes
1352 LIBC_TRY_LINK_STATIC([
1353 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1354 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1355 ],
1356 [dnl
1357 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1358 { gsub(/\@<:@ */, "@<:@") }
1359 $2 == ".ctors" || $2 == ".dtors" {
1360 size = strtonum("0x" $6)
1361 align = strtonum("0x" $NF)
1362 seen@<:@$2@:>@ = 1
1363 stub@<:@$2@:>@ = size == align * 2
1364 }
1365 END {
1366 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1367 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1368 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1369 }
1370 '], [libc_cv_ctors_header=no])
1371 ], [dnl
1372 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1373 ])
1374 ])
1375 if test $libc_cv_ctors_header = no; then
1376 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1377 fi
1379 AC_CACHE_CHECK(for libunwind-support in compiler,
1380 libc_cv_cc_with_libunwind, [
1381 cat > conftest.c <<EOF
1382 int main (void) { return 0; }
1383 EOF
1384 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1385 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1386 libc_cv_cc_with_libunwind=yes
1387 else
1388 libc_cv_cc_with_libunwind=no
1389 fi
1390 rm -f conftest*])
1391 AC_SUBST(libc_cv_cc_with_libunwind)
1392 if test $libc_cv_cc_with_libunwind = yes; then
1393 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1394 fi
1396 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1397 [libc_cv_z_nodelete=yes],
1398 [AC_MSG_ERROR(linker with -z nodelete support required)])
1400 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1401 [libc_cv_z_nodlopen=yes],
1402 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1404 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1405 [libc_cv_z_initfirst=yes],
1406 [AC_MSG_ERROR(linker with -z initfirst support required)])
1408 # Add-on fragments can set these for other machines.
1409 libc_commonpagesize=${libc_commonpagesize:-no}
1410 libc_relro_required=${libc_relro_required:-no}
1411 case "$base_machine" in
1412 i[[34567]]86 | x86_64 | powerpc* | s390*)
1413 libc_commonpagesize=0x1000
1414 libc_relro_required=yes
1415 ;;
1416 sparc*)
1417 libc_commonpagesize=0x2000
1418 libc_relro_required=yes
1419 ;;
1420 esac
1422 if test $libc_commonpagesize != no; then
1423 AC_CACHE_CHECK(for -z relro option,
1424 libc_cv_z_relro, [dnl
1425 libc_cv_z_relro=no
1426 AC_LANG_CONFTEST([AC_LANG_SOURCE([[
1427 int _start (void) { return 42; }
1428 extern void _exit (int);
1429 /* Since these pointers are const, they should go in rodata.
1430 Since they refer to functions that have to be resolved by
1431 dynamic linking, they should instead go in RELRO data. */
1432 const void *const relro[] = { &_start, &_exit, 0 };
1433 /* GNU ld fails to produce RELRO data when it's very small and there is no
1434 normal writable data following it, or if only uninitialized (.bss) data
1435 follows it, or only very small writable data. */
1436 int data[0x10000] = { 1, };
1437 ]])])
1438 cat > conftest.awk <<\EOF
1439 BEGIN {
1440 result = "no"
1441 commonpagesize = strtonum(commonpagesize)
1442 }
1443 { print "LINE:", $0 > "/dev/stderr" }
1444 $1 == "GNU_RELRO" {
1445 vaddr = strtonum($3)
1446 memsz = strtonum($6)
1447 end = vaddr + memsz
1448 printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
1449 vaddr, memsz, end, commonpagesize > "/dev/stderr"
1450 result = (end % commonpagesize == 0) ? "yes" : "broken"
1451 }
1452 END { print result }
1453 EOF
1454 AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1455 -fPIC -shared -o conftest.so conftest.c
1456 -nostartfiles -nostdlib
1457 -Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
1458 AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
1459 AC_TRY_COMMAND([
1460 $AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
1461 conftest.ph > conftest.cps
1462 ]) &&
1463 libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
1464 rm -f conftest*])
1465 if { test "x$libc_relro_required" = xyes &&
1466 test "x$libc_cv_z_relro" != xyes
1467 }
1468 then
1469 AC_MSG_ERROR(linker with -z relro support required)
1470 fi
1471 else
1472 AC_MSG_WARN([missing architecture parameter to check for working -z relro])
1473 fi
1475 AC_CACHE_CHECK(for -Bgroup option,
1476 libc_cv_Bgroup, [dnl
1477 cat > conftest.c <<EOF
1478 int _start (void) { return 42; }
1479 EOF
1480 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1481 -fPIC -shared -o conftest.so conftest.c
1482 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1483 then
1484 libc_cv_Bgroup=yes
1485 else
1486 libc_cv_Bgroup=no
1487 fi
1488 rm -f conftest*])
1489 AC_SUBST(libc_cv_Bgroup)
1491 ASFLAGS_config=
1492 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1493 libc_cv_as_noexecstack, [dnl
1494 cat > conftest.c <<EOF
1495 void foo (void) { }
1496 EOF
1497 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1498 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1499 && grep .note.GNU-stack conftest.s >/dev/null \
1500 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1501 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1502 then
1503 libc_cv_as_noexecstack=yes
1504 else
1505 libc_cv_as_noexecstack=no
1506 fi
1507 rm -f conftest*])
1508 if test $libc_cv_as_noexecstack = yes; then
1509 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1510 fi
1511 AC_SUBST(ASFLAGS_config)
1513 AC_CACHE_CHECK(for -z combreloc,
1514 libc_cv_z_combreloc, [dnl
1515 cat > conftest.c <<EOF
1516 extern int bar (int);
1517 extern int mumble;
1518 int foo (void) { return bar (mumble); }
1519 EOF
1520 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1521 -fPIC -shared -o conftest.so conftest.c
1522 -nostdlib -nostartfiles
1523 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1524 then
1525 dnl The following test is a bit weak. We must use a tool which can test
1526 dnl cross-platform since the gcc used can be a cross compiler. Without
1527 dnl introducing new options this is not easily doable. Instead use a tool
1528 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1529 dnl look for a section named .rel.dyn.
1530 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1531 libc_cv_z_combreloc=yes
1532 else
1533 libc_cv_z_combreloc=no
1534 fi
1535 else
1536 libc_cv_z_combreloc=no
1537 fi
1538 rm -f conftest*])
1539 if test "$libc_cv_z_combreloc" = yes; then
1540 AC_DEFINE(HAVE_Z_COMBRELOC)
1541 fi
1542 AC_SUBST(libc_cv_z_combreloc)
1544 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1545 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1546 AC_SUBST(libc_cv_z_execstack)
1548 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1549 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1550 ])
1552 AC_SUBST(libc_cv_fpie)
1554 AC_CACHE_CHECK(for --hash-style option,
1555 libc_cv_hashstyle, [dnl
1556 cat > conftest.c <<EOF
1557 int _start (void) { return 42; }
1558 EOF
1559 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1560 -fPIC -shared -o conftest.so conftest.c
1561 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1562 then
1563 libc_cv_hashstyle=yes
1564 else
1565 libc_cv_hashstyle=no
1566 fi
1567 rm -f conftest*])
1568 AC_SUBST(libc_cv_hashstyle)
1570 # The linker's default -shared behavior is good enough if it
1571 # does these things that our custom linker scripts ensure that
1572 # all allocated NOTE sections come first.
1573 if test "$use_default_link" = default; then
1574 AC_CACHE_CHECK([for sufficient default -shared layout],
1575 libc_cv_use_default_link, [dnl
1576 libc_cv_use_default_link=no
1577 cat > conftest.s <<\EOF
1578 .section .note.a,"a",%note
1579 .balign 4
1580 .long 4,4,9
1581 .string "GNU"
1582 .string "foo"
1583 .section .note.b,"a",%note
1584 .balign 4
1585 .long 4,4,9
1586 .string "GNU"
1587 .string "bar"
1588 EOF
1589 if AC_TRY_COMMAND([dnl
1590 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1591 ac_try=`$READELF -S conftest.so | sed -n \
1592 ['${x;p;}
1593 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1594 t a
1595 b
1596 : a
1597 H']`
1598 then
1599 libc_seen_a=no libc_seen_b=no
1600 set -- $ac_try
1601 while test $# -ge 2 -a "$1" = NOTE; do
1602 case "$2" in
1603 .note.a) libc_seen_a=yes ;;
1604 .note.b) libc_seen_b=yes ;;
1605 esac
1606 shift 2
1607 done
1608 case "$libc_seen_a$libc_seen_b" in
1609 yesyes)
1610 libc_cv_use_default_link=yes
1611 ;;
1612 *)
1613 echo >&AS_MESSAGE_LOG_FD "\
1614 $libc_seen_a$libc_seen_b from:
1615 $ac_try"
1616 ;;
1617 esac
1618 fi
1619 rm -f conftest*])
1620 use_default_link=$libc_cv_use_default_link
1621 fi
1623 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1624 if libc_cv_output_format=`
1625 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1626 then
1627 :
1628 else
1629 libc_cv_output_format=
1630 fi
1631 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1632 AC_SUBST(libc_cv_output_format)
1634 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1635 cat > conftest.c <<EOF
1636 int foo;
1637 EOF
1638 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1639 conftest.c 1>&AS_MESSAGE_LOG_FD])
1640 then
1641 libc_cv_fno_toplevel_reorder=yes
1642 else
1643 libc_cv_fno_toplevel_reorder=no
1644 fi
1645 rm -f conftest*])
1646 if test $libc_cv_fno_toplevel_reorder = yes; then
1647 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1648 else
1649 fno_unit_at_a_time=-fno-unit-at-a-time
1650 fi
1651 AC_SUBST(fno_unit_at_a_time)
1653 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1654 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1655 [libc_cv_ssp=yes],
1656 [libc_cv_ssp=no])
1657 ])
1658 AC_SUBST(libc_cv_ssp)
1660 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1661 cat > conftest.c <<EOF
1662 int foo;
1663 #ifdef __GNUC_GNU_INLINE__
1664 main () { return 0;}
1665 #else
1666 #error
1667 #endif
1668 EOF
1669 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1670 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1671 then
1672 libc_cv_gnu89_inline=yes
1673 else
1674 libc_cv_gnu89_inline=no
1675 fi
1676 rm -f conftest*])
1677 if test $libc_cv_gnu89_inline = yes; then
1678 gnu89_inline=-fgnu89-inline
1679 else
1680 gnu89_inline=
1681 fi
1682 AC_SUBST(gnu89_inline)
1684 AC_CACHE_CHECK(whether cc puts quotes around section names,
1685 libc_cv_have_section_quotes,
1686 [cat > conftest.c <<EOF
1687 static const int foo
1688 __attribute__ ((section ("bar"))) = 1;
1689 EOF
1690 if ${CC-cc} -S conftest.c -o conftest.s; then
1691 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1692 libc_cv_have_section_quotes=yes
1693 else
1694 libc_cv_have_section_quotes=no
1695 fi
1696 else
1697 libc_cv_have_section_quotes=unknown
1698 fi
1699 rm -f conftest.{c,s}
1700 ])
1701 if test $libc_cv_have_section_quotes = yes; then
1702 AC_DEFINE(HAVE_SECTION_QUOTES)
1703 fi
1705 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1706 [dnl
1707 cat > conftest.s <<EOF
1708 ${libc_cv_dot_text}
1709 .globl foo
1710 foo:
1711 .weak foo
1712 .weak bar; bar = foo
1713 EOF
1714 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1715 libc_cv_asm_weak_directive=yes
1716 else
1717 libc_cv_asm_weak_directive=no
1718 fi
1719 rm -f conftest*])
1721 if test $libc_cv_asm_weak_directive = no; then
1722 AC_CACHE_CHECK(for assembler .weakext directive,
1723 libc_cv_asm_weakext_directive,
1724 [dnl
1725 cat > conftest.s <<EOF
1726 ${libc_cv_dot_text}
1727 .globl foo
1728 foo:
1729 .weakext bar foo
1730 .weakext baz
1731 .globl baz
1732 baz:
1733 EOF
1734 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1735 libc_cv_asm_weakext_directive=yes
1736 else
1737 libc_cv_asm_weakext_directive=no
1738 fi
1739 rm -f conftest*])
1741 fi # no .weak
1743 if test $libc_cv_asm_weak_directive = yes; then
1744 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1745 elif test $libc_cv_asm_weakext_directive = yes; then
1746 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1747 fi
1749 AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
1750 case $machine in
1751 sparc/sparc64*) cfi_offset=2047;;
1752 *) cfi_offset=0;;
1753 esac
1754 cat > conftest.s <<EOF
1755 .text
1756 .type func,%function
1757 func:
1758 .cfi_startproc
1759 .cfi_remember_state
1760 .cfi_rel_offset 1, $cfi_offset
1761 .cfi_endproc
1762 EOF
1763 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1764 libc_cv_asm_cfi_directives=yes
1765 else
1766 libc_cv_asm_cfi_directives=no
1767 fi
1768 rm -f conftest*])
1769 if test $libc_cv_asm_cfi_directives = yes; then
1770 AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
1771 fi
1773 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1774 cat > conftest.c <<\EOF
1775 _start () {}
1776 int __eh_pc;
1777 __throw () {}
1778 EOF
1779 dnl No \ in command here because it ends up inside ''.
1780 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1781 -nostdlib -nostartfiles -Wl,--no-whole-archive
1782 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1783 libc_cv_ld_no_whole_archive=yes
1784 else
1785 libc_cv_ld_no_whole_archive=no
1786 fi
1787 rm -f conftest*])
1788 if test $libc_cv_ld_no_whole_archive = no; then
1789 AC_MSG_ERROR([support for --no-whole-archive is needed])
1790 fi
1792 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1793 cat > conftest.c <<\EOF
1794 _start () {}
1795 int __eh_pc;
1796 __throw () {}
1797 EOF
1798 dnl No \ in command here because it ends up inside ''.
1799 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1800 -nostdlib -nostartfiles -fexceptions
1801 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1802 libc_cv_gcc_exceptions=yes
1803 else
1804 libc_cv_gcc_exceptions=no
1805 fi
1806 rm -f conftest*])
1807 if test $libc_cv_gcc_exceptions = yes; then
1808 exceptions=-fexceptions
1809 fi
1810 AC_SUBST(exceptions)dnl
1812 if test "$host_cpu" = powerpc ; then
1813 # Check for a bug present in at least versions 2.8.x of GCC
1814 # and versions 1.0.x of EGCS.
1815 AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
1816 AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
1817 libc_cv_c_asmcr0_bug='no',
1818 libc_cv_c_asmcr0_bug='yes')])
1819 if test "$libc_cv_c_asmcr0_bug" != 'no'; then
1820 AC_DEFINE(BROKEN_PPC_ASM_CR0)
1821 fi
1822 fi
1824 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1825 cat > conftest.c <<\EOF
1826 void zero (void *x)
1827 {
1828 __builtin_memset (x, 0, 1000);
1829 }
1830 EOF
1831 dnl
1832 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1833 then
1834 libc_cv_gcc_builtin_memset=no
1835 else
1836 libc_cv_gcc_builtin_memset=yes
1837 fi
1838 rm -f conftest* ])
1839 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1840 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1841 fi
1843 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1844 cat > conftest.c <<\EOF
1845 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1846 char *foo (const char *a, const char *b)
1847 {
1848 return __builtin_strstr (a, b);
1849 }
1850 EOF
1851 dnl
1852 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1853 then
1854 libc_cv_gcc_builtin_redirection=yes
1855 else
1856 libc_cv_gcc_builtin_redirection=no
1857 fi
1858 rm -f conftest* ])
1859 if test "$libc_cv_gcc_builtin_redirection" = no; then
1860 AC_MSG_ERROR([support for the symbol redirection needed])
1861 fi
1863 dnl Check whether the compiler supports the __thread keyword.
1864 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1865 [cat > conftest.c <<\EOF
1866 __thread int a = 42;
1867 EOF
1868 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1869 libc_cv_gcc___thread=yes
1870 else
1871 libc_cv_gcc___thread=no
1872 fi
1873 rm -f conftest*])
1874 if test "$libc_cv_gcc___thread" = no; then
1875 AC_MSG_ERROR([support for the __thread keyword is required])
1876 fi
1878 dnl Check whether the compiler supports the tls_model attribute.
1879 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1880 cat > conftest.c <<\EOF
1881 extern __thread int a __attribute__((tls_model ("initial-exec")));
1882 EOF
1883 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1884 libc_cv_gcc_tls_model_attr=yes
1885 else
1886 libc_cv_gcc_tls_model_attr=no
1887 fi
1888 rm -f conftest*])
1889 if test "$libc_cv_gcc_tls_model_attr" = no; then
1890 AC_MSG_ERROR([support for the tls_model attribute is required])
1891 fi
1893 dnl Determine how to disable generation of FMA instructions.
1894 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1895 libc_cv_cc_nofma, [dnl
1896 libc_cv_cc_nofma=
1897 for opt in -ffp-contract=off -mno-fused-madd; do
1898 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1899 done])
1900 AC_SUBST(libc_cv_cc_nofma)
1902 if test -n "$submachine"; then
1903 AC_CACHE_CHECK([for compiler option for CPU variant],
1904 libc_cv_cc_submachine, [dnl
1905 libc_cv_cc_submachine=no
1906 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1907 LIBC_TRY_CC_OPTION([$opt], [
1908 libc_cv_cc_submachine="$opt"
1909 break], [])
1910 done])
1911 if test "x$libc_cv_cc_submachine" = xno; then
1912 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1913 fi
1914 fi
1915 AC_SUBST(libc_cv_cc_submachine)
1917 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1918 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1919 cat > conftest.c <<EOF
1920 void
1921 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1922 foo (void) {}
1923 EOF
1924 libc_cv_cc_loop_to_function=no
1925 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1926 then
1927 libc_cv_cc_loop_to_function=yes
1928 fi
1929 rm -f conftest*])
1930 if test $libc_cv_cc_loop_to_function = yes; then
1931 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1932 fi
1933 AC_SUBST(libc_cv_cc_loop_to_function)
1935 dnl Check whether we have the gd library available.
1936 AC_MSG_CHECKING(for libgd)
1937 if test "$with_gd" != "no"; then
1938 old_CFLAGS="$CFLAGS"
1939 CFLAGS="$CFLAGS $libgd_include"
1940 old_LDFLAGS="$LDFLAGS"
1941 LDFLAGS="$LDFLAGS $libgd_ldflags"
1942 old_LIBS="$LIBS"
1943 LIBS="$LIBS -lgd -lpng -lz -lm"
1944 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1945 CFLAGS="$old_CFLAGS"
1946 LDFLAGS="$old_LDFLAGS"
1947 LIBS="$old_LIBS"
1948 else
1949 LIBGD=no
1950 fi
1951 AC_MSG_RESULT($LIBGD)
1952 AC_SUBST(LIBGD)
1954 # SELinux detection
1955 if test x$with_selinux = xno ; then
1956 have_selinux=no;
1957 else
1958 # See if we have the SELinux library
1959 AC_CHECK_LIB(selinux, is_selinux_enabled,
1960 have_selinux=yes, have_selinux=no)
1961 # See if we have the SELinux header with the NSCD permissions in it.
1962 if test x$have_selinux = xyes ; then
1963 AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
1964 AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
1965 [#ifdef NSCD__SHMEMHOST
1966 return 0;
1967 #else
1968 #error NSCD__SHMEMHOST not defined
1969 #endif],
1970 have_selinux=yes, have_selinux=no)
1971 AC_MSG_RESULT($have_selinux)
1972 fi
1974 if test x$with_selinux = xyes ; then
1975 if test x$have_selinux = xno ; then
1976 AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent SELinux library not found])
1977 fi
1978 fi
1979 fi
1980 # Check if we're building with SELinux support.
1981 if test "x$have_selinux" = xyes; then
1982 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1984 # See if we have the libaudit library
1985 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1986 have_libaudit=yes, have_libaudit=no)
1987 if test "x$have_libaudit" = xyes; then
1988 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1989 fi
1990 AC_SUBST(have_libaudit)
1992 # See if we have the libcap library
1993 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1994 if test "x$have_libcap" = xyes; then
1995 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1996 fi
1997 AC_SUBST(have_libcap)
1998 fi
1999 AC_SUBST(have_selinux)
2001 dnl check for the size of 'long double'.
2002 AC_CHECK_SIZEOF(long double, 0)
2003 sizeof_long_double=$ac_cv_sizeof_long_double
2004 AC_SUBST(sizeof_long_double)
2006 CPPUNDEFS=
2007 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
2008 dnl Since we are building the implementations of the fortified functions here,
2009 dnl having the macro defined interacts very badly.
2010 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
2011 [AC_TRY_COMPILE([], [
2012 #ifdef _FORTIFY_SOURCE
2013 # error bogon
2014 #endif],
2015 [libc_cv_predef_fortify_source=no],
2016 [libc_cv_predef_fortify_source=yes])])
2017 if test $libc_cv_predef_fortify_source = yes; then
2018 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
2019 fi
2020 AC_SUBST(CPPUNDEFS)
2022 dnl Check for silly hacked compilers inserting -fstack-protector.
2023 dnl This breaks badly for the early startup code we compile, since
2024 dnl the compiled code can refer to a magic machine-dependent location
2025 dnl for the canary value before we have sufficient setup for that to
2026 dnl work. It's also questionable to build all of libc with this flag
2027 dnl even when you're doing that for most applications you build, since
2028 dnl libc's code is so heavily-used and performance-sensitive. If we
2029 dnl ever really want to make that work, it should be enabled explicitly
2030 dnl in the libc build, not inherited from implicit compiler settings.
2031 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
2032 libc_cv_predef_stack_protector, [
2033 AC_TRY_COMPILE([extern void foobar (char *);],
2034 [char large_array[2048]; foobar (large_array);], [
2035 libc_undefs=`$NM -u conftest.o |
2036 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2037 2>&AS_MESSAGE_LOG_FD` || {
2038 AC_MSG_ERROR([confusing output from $NM -u])
2039 }
2040 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
2041 # On some architectures, there are architecture-specific undefined
2042 # symbols (resolved by the linker), so filter out unknown symbols.
2043 # This will fail to produce the correct result if the compiler
2044 # defaults to -fstack-protector but this produces an undefined symbol
2045 # other than __stack_chk_fail. However, compilers like that have not
2046 # been encountered in practice.
2047 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
2048 case "$libc_undefs" in
2049 foobar) libc_cv_predef_stack_protector=no ;;
2050 '__stack_chk_fail
2051 foobar') libc_cv_predef_stack_protector=yes ;;
2052 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
2053 esac],
2054 [AC_MSG_ERROR([test compilation failed])])
2055 ])
2056 libc_extra_cflags=
2057 if test $libc_cv_predef_stack_protector = yes; then
2058 libc_extra_cflags=-fno-stack-protector
2059 fi
2060 AC_SUBST(libc_extra_cflags)
2062 ### End of automated tests.
2063 ### Now run sysdeps configure fragments.
2065 # They also can set these variables.
2066 use_ldconfig=no
2067 ldd_rewrite_script=no
2068 libc_cv_sysconfdir=$sysconfdir
2069 libc_cv_localstatedir=$localstatedir
2070 libc_cv_gcc_unwind_find_fde=no
2071 libc_cv_idn=no
2073 # Iterate over all the sysdep directories we will use, running their
2074 # configure fragments.
2075 for dir in $sysnames; do
2076 case $dir in
2077 /*) dest=$dir ;;
2078 *) dest=$srcdir/$dir ;;
2079 esac
2080 if test -r $dest/configure; then
2081 AC_MSG_RESULT(running configure fragment for $dir)
2082 . $dest/configure
2083 fi
2084 done
2086 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
2087 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
2088 fi
2089 AC_SUBST(libc_cv_gcc_unwind_find_fde)
2091 # A sysdeps configure fragment can reset this if IFUNC is not actually
2092 # usable even though the assembler knows how to generate the symbol type.
2093 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2094 AC_DEFINE(HAVE_IFUNC)
2095 fi
2097 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2098 # configure fragment can override the value to prevent this AC_DEFINE.
2099 AC_SUBST(use_nscd)
2100 if test "x$use_nscd" != xno; then
2101 AC_DEFINE([USE_NSCD])
2102 fi
2103 if test "x$build_nscd" = xdefault; then
2104 build_nscd=$use_nscd
2105 fi
2107 # Test for old glibc 2.0.x headers so that they can be removed properly
2108 # Search only in includedir.
2109 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2110 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2111 then
2112 old_glibc_headers=yes
2113 else
2114 old_glibc_headers=no
2115 fi
2116 AC_MSG_RESULT($old_glibc_headers)
2117 if test ${old_glibc_headers} = yes; then
2118 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2119 AC_MSG_WARN(*** be removed.)
2120 fi
2121 AC_SUBST(old_glibc_headers)
2123 AC_SUBST(libc_cv_slibdir)
2124 AC_SUBST(libc_cv_rtlddir)
2125 AC_SUBST(libc_cv_localedir)
2126 AC_SUBST(libc_cv_sysconfdir)
2127 AC_SUBST(libc_cv_localstatedir)
2128 AC_SUBST(libc_cv_rootsbindir)
2129 AC_SUBST(libc_cv_forced_unwind)
2131 if test x$use_ldconfig = xyes; then
2132 AC_DEFINE(USE_LDCONFIG)
2133 fi
2134 AC_SUBST(use_ldconfig)
2135 AC_SUBST(ldd_rewrite_script)
2137 AC_SUBST(static)
2138 AC_SUBST(shared)
2140 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2141 [libc_cv_pic_default=yes
2142 cat > conftest.c <<EOF
2143 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2144 # error PIC is default.
2145 #endif
2146 EOF
2147 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2148 libc_cv_pic_default=no
2149 fi
2150 rm -f conftest.*])
2151 AC_SUBST(libc_cv_pic_default)
2153 AC_SUBST(profile)
2154 AC_SUBST(static_nss)
2156 AC_SUBST(DEFINES)
2158 dnl See sysdeps/mach/configure.in for this variable.
2159 AC_SUBST(mach_interface_list)
2161 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2162 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2163 AC_SUBST(VERSION)
2164 AC_SUBST(RELEASE)
2166 AC_CONFIG_FILES([config.make Makefile])
2167 AC_CONFIG_COMMANDS([default],[[
2168 case $CONFIG_FILES in *config.make*)
2169 echo "$config_vars" >> config.make;;
2170 esac
2171 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2172 AC_OUTPUT