| blob | 82d0896c31e8216e362c119462dec4e696e1641e |
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=$enableval],
152 [profile=no])
154 AC_ARG_ENABLE([hardcoded-path-in-tests],
155 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
156 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
157 [hardcoded_path_in_tests=$enableval],
158 [hardcoded_path_in_tests=no])
159 AC_SUBST(hardcoded_path_in_tests)
161 AC_ARG_ENABLE([stackguard-randomization],
162 AC_HELP_STRING([--enable-stackguard-randomization],
163 [initialize __stack_chk_guard canary with a random number at program start]),
164 [enable_stackguard_randomize=$enableval],
165 [enable_stackguard_randomize=no])
166 if test "$enable_stackguard_randomize" = yes; then
167 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
168 fi
170 AC_ARG_ENABLE([lock-elision],
171 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
172 [Enable lock elision for pthread mutexes by default]),
173 [enable_lock_elision=$enableval],
174 [enable_lock_elision=no])
175 AC_SUBST(enable_lock_elision)
176 if test "$enable_lock_elision" = yes ; then
177 AC_DEFINE(ENABLE_LOCK_ELISION)
178 fi
180 dnl Generic infrastructure for drop-in additions to libc.
181 AC_ARG_ENABLE([add-ons],
182 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
183 [configure and build add-ons in DIR1,DIR2,...
184 search for add-ons if no parameter given]),
185 , [enable_add_ons=yes])
187 AC_ARG_ENABLE([hidden-plt],
188 AC_HELP_STRING([--disable-hidden-plt],
189 [do not hide internal function calls to avoid PLT]),
190 [hidden=$enableval],
191 [hidden=yes])
192 if test "x$hidden" = xno; then
193 AC_DEFINE(NO_HIDDEN)
194 fi
196 AC_ARG_ENABLE([bind-now],
197 AC_HELP_STRING([--enable-bind-now],
198 [disable lazy relocations in DSOs]),
199 [bindnow=$enableval],
200 [bindnow=no])
201 AC_SUBST(bindnow)
203 dnl On some platforms we cannot use dynamic loading. We must provide
204 dnl static NSS modules.
205 AC_ARG_ENABLE([static-nss],
206 AC_HELP_STRING([--enable-static-nss],
207 [build static NSS modules @<:@default=no@:>@]),
208 [static_nss=$enableval],
209 [static_nss=no])
210 dnl Enable static NSS also if we build no shared objects.
211 if test x"$static_nss" = xyes || test x"$shared" = xno; then
212 static_nss=yes
213 AC_DEFINE(DO_STATIC_NSS)
214 fi
216 AC_ARG_ENABLE([force-install],
217 AC_HELP_STRING([--disable-force-install],
218 [don't force installation of files from this package, even if they are older than the installed files]),
219 [force_install=$enableval],
220 [force_install=yes])
221 AC_SUBST(force_install)
223 AC_ARG_ENABLE([maintainer-mode],
224 AC_HELP_STRING([--enable-maintainer-mode],
225 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
226 [maintainer=$enableval],
227 [maintainer=no])
229 dnl On some platforms we allow dropping compatibility with all kernel
230 dnl versions.
231 AC_ARG_ENABLE([kernel],
232 AC_HELP_STRING([--enable-kernel=VERSION],
233 [compile for compatibility with kernel not older than VERSION]),
234 [minimum_kernel=$enableval],
235 [])
236 dnl Prevent unreasonable values.
237 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
238 # Better nothing than this.
239 minimum_kernel=""
240 else
241 if test "$minimum_kernel" = current; then
242 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
243 fi
244 fi
246 dnl For the development we sometimes want gcc to issue even more warnings.
247 dnl This is not the default since many of the extra warnings are not
248 dnl appropriate.
249 AC_ARG_ENABLE([all-warnings],
250 AC_HELP_STRING([--enable-all-warnings],
251 [enable all useful warnings gcc can issue]),
252 [all_warnings=$enableval],
253 [])
254 AC_SUBST(all_warnings)
256 AC_ARG_ENABLE([multi-arch],
257 AC_HELP_STRING([--enable-multi-arch],
258 [enable single DSO with optimizations for multiple architectures]),
259 [multi_arch=$enableval],
260 [multi_arch=default])
262 AC_ARG_ENABLE([nss-crypt],
263 AC_HELP_STRING([--enable-nss-crypt],
264 [enable libcrypt to use nss]),
265 [nss_crypt=$enableval],
266 [nss_crypt=no])
267 if test x$nss_crypt = xyes; then
268 nss_includes=-I$(nss-config --includedir 2>/dev/null)
269 if test $? -ne 0; then
270 AC_MSG_ERROR([cannot find include directory with nss-config])
271 fi
272 old_CFLAGS="$CFLAGS"
273 CFLAGS="$CFLAGS $nss_includes"
274 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
275 #include <hasht.h>
276 #include <nsslowhash.h>
277 void f (void) { NSSLOW_Init (); }])],
278 libc_cv_nss_crypt=yes,
279 AC_MSG_ERROR([
280 cannot find NSS headers with lowlevel hash function interfaces]))
281 old_LIBS="$LIBS"
282 LIBS="$LIBS -lfreebl3"
283 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
284 #include <hasht.h>
285 #include <nsslowhash.h>],
286 [NSSLOW_Init();])],
287 libc_cv_nss_crypt=yes,
288 AC_MSG_ERROR([
289 cannot link program using lowlevel NSS hash functions]))
290 CFLAGS="$old_CFLAGS"
291 LIBS="$old_LIBS"
292 else
293 libc_cv_nss_crypt=no
294 fi
295 AC_SUBST(libc_cv_nss_crypt)
298 AC_ARG_ENABLE([obsolete-rpc],
299 AC_HELP_STRING([--enable-obsolete-rpc],
300 [build and install the obsolete RPC code for link-time usage]),
301 [link_obsolete_rpc=$enableval],
302 [link_obsolete_rpc=no])
303 AC_SUBST(link_obsolete_rpc)
305 if test "$link_obsolete_rpc" = yes; then
306 AC_DEFINE(LINK_OBSOLETE_RPC)
307 fi
309 AC_ARG_ENABLE([systemtap],
310 [AS_HELP_STRING([--enable-systemtap],
311 [enable systemtap static probe points @<:@default=no@:>@])],
312 [systemtap=$enableval],
313 [systemtap=no])
314 if test "x$systemtap" != xno; then
315 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
316 old_CFLAGS="$CFLAGS"
317 CFLAGS="-std=gnu99 $CFLAGS"
318 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
319 void foo (int i, void *p)
320 {
321 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
322 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
323 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
324 CFLAGS="$old_CFLAGS"])
325 if test $libc_cv_sdt = yes; then
326 AC_DEFINE([USE_STAP_PROBE])
327 elif test "x$systemtap" != xauto; then
328 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
329 fi
330 fi
332 AC_ARG_ENABLE([build-nscd],
333 [AS_HELP_STRING([--disable-build-nscd],
334 [disable building and installing the nscd daemon])],
335 [build_nscd=$enableval],
336 [build_nscd=default])
337 AC_SUBST(build_nscd)
339 # Note the use of $use_nscd is near the bottom of the file.
340 AC_ARG_ENABLE([nscd],
341 [AS_HELP_STRING([--disable-nscd],
342 [library functions will not contact the nscd daemon])],
343 [use_nscd=$enableval],
344 [use_nscd=yes])
346 AC_ARG_ENABLE([pt_chown],
347 [AS_HELP_STRING([--enable-pt_chown],
348 [Enable building and installing pt_chown])],
349 [build_pt_chown=$enableval],
350 [build_pt_chown=no])
351 AC_SUBST(build_pt_chown)
352 if test "$build_pt_chown" = yes; then
353 AC_DEFINE(HAVE_PT_CHOWN)
354 fi
356 # We keep the original values in `$config_*' and never modify them, so we
357 # can write them unchanged into config.make. Everything else uses
358 # $machine, $vendor, and $os, and changes them whenever convenient.
359 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
361 # Don't allow vendor == "unknown"
362 test "$config_vendor" = unknown && config_vendor=
363 config_os="`echo $config_os | sed 's/^unknown-//'`"
365 # Some configurations imply other options.
366 elf=yes
368 # The configure fragment of an add-on port can modify these to supplement
369 # or override the table in the case statement below. No fragment should
370 # ever change the config_* variables, however.
371 machine=$config_machine
372 vendor=$config_vendor
373 os=$config_os
374 base_os=''
376 submachine=
377 AC_ARG_WITH([cpu],
378 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
379 [dnl
380 case "$withval" in
381 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
382 no) ;;
383 *) submachine="$withval" ;;
384 esac
385 ])
387 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
388 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
390 # An add-on can set this when it wants to disable the sanity check below.
391 libc_config_ok=no
393 dnl Having this here, though empty, makes sure that if add-ons' fragments
394 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
395 dnl our AC_OUTPUT will actually use it.
396 AC_CONFIG_SUBDIRS()
398 case "$enable_add_ons" in
399 ''|no) add_ons= ;;
400 yes|'*')
401 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
402 sed 's@/[[^/]]*$@@' | sort | uniq`
403 add_ons_automatic=yes
404 ;;
405 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
406 add_ons_automatic=no ;;
407 esac
409 configured_add_ons=
410 add_ons_sfx=
411 add_ons_pfx=
412 if test x"$add_ons" != x; then
413 for f in $add_ons; do
414 # Some sanity checks
415 case "$f" in
416 crypt)
417 AC_MSG_ERROR([
418 *** It seems that you're using an old \`crypt' add-on. crypt is now
419 *** part of glibc and using the old add-on will not work with this
420 *** release. Start again with fresh sources and without the old
421 *** \`crypt' add-on.])
422 ;;
423 localedata)
424 AC_MSG_ERROR([
425 *** It seems that you're using an old \`localedata' add-on. localedata
426 *** is now part of glibc and using the old add-on will not work with
427 *** this release. Start again with fresh sources and without the old
428 *** \`localedata' add-on.])
429 ;;
430 esac
431 done
433 # Now source each add-on's configure fragment.
434 # The fragments can use $srcdir/$libc_add_on to find themselves,
435 # and test $add_ons_automatic to see if they were explicitly requested.
436 # A fragment can clear (or even change) $libc_add_on to affect
437 # whether it goes into the list to be actually used in the build.
438 use_add_ons=
439 for libc_add_on in $add_ons; do
440 # Test whether such a directory really exists.
441 # It can be absolute, or relative to $srcdir, or relative to the build dir.
442 case "$libc_add_on" in
443 /*)
444 libc_add_on_srcdir=$libc_add_on
445 ;;
446 *)
447 test -d "$srcdir/$libc_add_on" || {
448 if test -d "$libc_add_on"; then
449 libc_add_on="`pwd`/$libc_add_on"
450 else
451 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
452 fi
453 }
454 libc_add_on_srcdir=$srcdir/$libc_add_on
455 ;;
456 esac
458 libc_add_on_frag=$libc_add_on_srcdir/configure
459 libc_add_on_canonical=
460 libc_add_on_config_subdirs=
461 if test -r "$libc_add_on_frag"; then
462 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
463 libc_add_on_canonical=unknown
464 libc_add_on_subdirs=
465 . "$libc_add_on_frag"
466 test -z "$libc_add_on" || {
467 configured_add_ons="$configured_add_ons $libc_add_on"
468 if test "x$libc_add_on_canonical" = xunknown; then
469 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
470 fi
471 for d in $libc_add_on_subdirs; do
472 case "$libc_add_on" in
473 /*) subdir_srcdir="$libc_add_on" ;;
474 *) subdir_srcdir="\$(..)$libc_add_on" ;;
475 esac
476 case "$d" in
477 .)
478 d="${libc_add_on_canonical:-$libc_add_on}"
479 ;;
480 /*)
481 subdir_srcdir="$d"
482 ;;
483 *)
484 subdir_srcdir="$subdir_srcdir/$d"
485 ;;
486 esac
487 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
488 add_on_subdirs="$add_on_subdirs $d"
489 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
490 $d-srcdir = $subdir_srcdir"
491 done
492 for d in $libc_add_on_config_subdirs; do
493 case "$d" in
494 /*) AC_MSG_ERROR(dnl
495 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
496 esac
497 if test ! -d "$libc_add_on_srcdir/$d"; then
498 AC_MSG_ERROR(fragment wants to configure missing directory $d)
499 fi
500 case "$libc_add_on" in
501 /*) AC_MSG_ERROR(dnl
502 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
503 esac
504 subdirs="$subdirs $libc_add_on/$d"
505 done
506 }
507 fi
508 if test -n "$libc_add_on"; then
509 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
510 use_add_ons="$use_add_ons $libc_add_on"
511 add_ons_pfx="$add_ons_pfx $libc_add_on/"
512 test -z "$libc_add_on_canonical" ||
513 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
514 fi
515 done
516 # Use echo to strip excess whitespace.
517 add_ons="`echo $use_add_ons`"
518 fi
519 AC_SUBST(add_ons)
520 AC_SUBST(add_on_subdirs)
523 ###
524 ### I put this here to prevent those annoying emails from people who cannot
525 ### read and try to compile glibc on unsupported platforms. --drepper
526 ###
527 ### By using the undocumented --enable-hacker-mode option for configure
528 ### one can skip this test to make the configuration not fail for unsupported
529 ### platforms.
530 ###
531 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
532 case "$machine-$host_os" in
533 *-linux* | *-gnu*)
534 ;;
535 *)
536 echo "*** The GNU C library is currently not available for this platform."
537 echo "*** So far nobody cared to port it and if there is no volunteer it"
538 echo "*** might never happen. So, if you have interest to see glibc on"
539 echo "*** this platform visit"
540 echo "*** http://www.gnu.org/software/libc/porting.html"
541 echo "*** and join the group of porters"
542 exit 1
543 ;;
544 esac
545 fi
547 # Set base_machine if not set by a preconfigure fragment.
548 test -n "$base_machine" || base_machine=$machine
549 AC_SUBST(base_machine)
551 # For the multi-arch option we need support in the assembler & linker.
552 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
553 libc_cv_ld_gnu_indirect_function, [dnl
554 cat > conftest.S <<EOF
555 .type foo,%gnu_indirect_function
556 foo:
557 .globl _start
558 _start:
559 .globl __start
560 __start:
561 .data
562 #ifdef _LP64
563 .quad foo
564 #else
565 .long foo
566 #endif
567 EOF
568 libc_cv_ld_gnu_indirect_function=no
569 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
570 -nostartfiles -nostdlib \
571 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
572 # Do a link to see if the backend supports IFUNC relocs.
573 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
574 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
575 libc_cv_ld_gnu_indirect_function=yes
576 }
577 fi
578 rm -f conftest*])
580 AC_MSG_CHECKING(whether .text pseudo-op must be used)
581 AC_CACHE_VAL(libc_cv_dot_text, [dnl
582 cat > conftest.s <<EOF
583 .text
584 EOF
585 libc_cv_dot_text=
586 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
587 libc_cv_dot_text=.text
588 fi
589 rm -f conftest*])
590 if test -z "$libc_cv_dot_text"; then
591 AC_MSG_RESULT(no)
592 else
593 AC_MSG_RESULT(yes)
594 fi
596 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
597 if test x"$multi_arch" = xyes; then
598 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
599 else
600 multi_arch=no
601 fi
602 fi
603 multi_arch_d=
604 if test x"$multi_arch" != xno; then
605 multi_arch_d=/multiarch
606 fi
608 # Compute the list of sysdep directories for this configuration.
609 # This can take a while to compute.
610 sysdep_dir=$srcdir/sysdeps
611 AC_MSG_CHECKING(sysdep dirs)
612 dnl We need to use [ and ] for other purposes for a while now.
613 changequote(,)dnl
614 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
615 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
617 test "x$base_os" != x || case "$os" in
618 gnu*)
619 base_os=mach/hurd ;;
620 linux*)
621 base_os=unix/sysv ;;
622 esac
624 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
625 tail=$os
626 ostry=$os
627 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
628 ostry="$ostry /$o"
629 tail=$o
630 done
631 o=`echo $tail | sed 's/[0-9]*$//'`
632 if test $o != $tail; then
633 ostry="$ostry /$o"
634 fi
635 # For linux-gnu, try linux-gnu, then linux.
636 o=`echo $tail | sed 's/-.*$//'`
637 if test $o != $tail; then
638 ostry="$ostry /$o"
639 fi
641 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
642 base=
643 tail=$base_os
644 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
645 set $b
646 base="$base /$1"
647 tail="$2"
648 done
650 # For sparc/sparc32, try sparc/sparc32 and then sparc.
651 mach=
652 tail=$machine${submachine:+/$submachine}
653 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
654 set $m
655 # Prepend the machine's FPU directory unless --without-fp.
656 if test "$with_fp" = yes; then
657 maybe_fpu=/fpu
658 else
659 maybe_fpu=/nofpu
660 fi
661 # For each machine term, try it with and then without /multiarch.
662 for try_fpu in $maybe_fpu ''; do
663 for try_multi in $multi_arch_d ''; do
664 mach="$mach /$1$try_fpu$try_multi"
665 done
666 done
667 tail="$2"
668 done
670 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
671 changequote([,])dnl
673 # Find what sysdep directories exist.
674 sysnames_add_ons=
675 sysnames=
676 for b in $base ''; do
677 for m0 in $mach ''; do
678 for v in /$vendor ''; do
679 test "$v" = / && continue
680 for o in /$ostry ''; do
681 test "$o" = / && continue
682 for m in $mach ''; do
683 for d in $add_ons_pfx ''; do
684 for a in $add_ons_sfx ''; do
685 try_suffix="$m0$b$v$o$m"
686 if test -n "$try_suffix"; then
687 try_srcdir="${srcdir}/"
688 case "$d" in
689 /*) try_srcdir= ;;
690 esac
691 try="${d}sysdeps$try_suffix$a"
692 test -n "$enable_debug_configure" &&
693 echo "$0 [DEBUG]: try $try" >&2
694 if test -d "$try_srcdir$try"; then
695 sysnames="$sysnames $try"
696 { test -n "$o" || test -n "$b"; } && os_used=t
697 { test -n "$m" || test -n "$m0"; } && machine_used=t
698 case x${m0:-$m} in
699 x*/$submachine) submachine_used=t ;;
700 esac
701 if test -n "$d"; then
702 case "$sysnames_add_ons" in
703 *" $d "*) ;;
704 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
705 esac
706 fi
707 fi
708 fi
709 done
710 done
711 done
712 done
713 done
714 done
715 done
717 # If the assembler supports gnu_indirect_function symbol type and the
718 # architecture supports multi-arch, we enable multi-arch by default.
719 case $sysnames_add_ons$sysnames in
720 *"$multi_arch_d"*)
721 ;;
722 *)
723 test x"$multi_arch" = xdefault && multi_arch=no
724 ;;
725 esac
726 if test x"$multi_arch" != xno; then
727 AC_DEFINE(USE_MULTIARCH)
728 fi
729 AC_SUBST(multi_arch)
731 if test -z "$os_used" && test "$os" != none; then
732 AC_MSG_ERROR(Operating system $os is not supported.)
733 fi
734 if test -z "$machine_used" && test "$machine" != none; then
735 AC_MSG_ERROR(The $machine is not supported.)
736 fi
737 if test -z "$submachine_used" && test -n "$submachine"; then
738 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
739 fi
740 AC_SUBST(submachine)
742 # We have now validated the configuration.
744 # Expand the list of system names into a full list of directories
745 # from each element's parent name and Implies file (if present).
746 set $sysnames
747 names=
748 while test $# -gt 0; do
749 name=$1
750 shift
752 case " $names " in *" $name "*)
753 # Already in the list.
754 continue
755 esac
757 # Report each name as we discover it, so there is no long pause in output.
758 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
760 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
762 case $name in
763 /*) xsrcdir= ;;
764 *) xsrcdir=$srcdir/ ;;
765 esac
766 test -n "$enable_debug_configure" &&
767 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
769 for implies_file in Implies Implies-before Implies-after; do
770 implies_type=`echo $implies_file | sed s/-/_/`
771 eval ${implies_type}=
772 if test -f $xsrcdir$name/$implies_file; then
773 # Collect more names from the `Implies' file (removing comments).
774 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
775 for x in $implied_candidate; do
776 found=no
777 if test -d $xsrcdir$name_base/$x; then
778 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
779 found=yes
780 fi
781 for d in $add_ons_pfx ''; do
782 try="${d}sysdeps/$x"
783 case $d in
784 /*) try_srcdir= ;;
785 *) try_srcdir=$srcdir/ ;;
786 esac
787 test -n "$enable_debug_configure" &&
788 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
789 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
790 then
791 eval "${implies_type}=\"\$${implies_type} \$try\""
792 found=yes
793 case "$sysnames_add_ons" in
794 *" $d "*) ;;
795 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
796 esac
797 fi
798 done
799 if test $found = no; then
800 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
801 fi
802 done
803 fi
804 done
806 # Add NAME to the list of names.
807 names="$names $name"
809 # Find the parent of NAME, using the empty string if it has none.
810 changequote(,)dnl
811 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
812 changequote([,])dnl
814 test -n "$enable_debug_configure" &&
815 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
816 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
818 # Add the names implied by NAME, and NAME's parent (if it has one), to
819 # the list of names to be processed (the argument list). We prepend the
820 # implied names to the list and append the parent. We want implied
821 # directories to come before further directories inferred from the
822 # configuration components; this ensures that for sysv4, unix/common
823 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
824 # after sysv4).
825 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
826 test -n "$sysnames" && set $sysnames
827 done
829 # Add the default directories.
830 default_sysnames="sysdeps/generic"
831 sysnames="$names $default_sysnames"
832 AC_SUBST(sysnames)
833 # The other names were emitted during the scan.
834 AC_MSG_RESULT($default_sysnames)
836 # Collect the list of add-ons that supply partial sysdeps trees.
837 sysdeps_add_ons=
838 for add_on in $add_ons; do
839 case "$add_on" in
840 /*) xsrcdir= ;;
841 *) xsrcdir="$srcdir/" ;;
842 esac
844 test -d "$xsrcdir$add_on/sysdeps" || {
845 case "$configured_add_ons " in
846 *" $add_on "*) ;;
847 *|'')
848 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
849 ;;
850 esac
851 continue
852 }
854 sysdeps_add_ons="$sysdeps_add_ons $add_on"
855 case "$sysnames_add_ons" in
856 *" $add_on/ "*) ;;
857 *|'')
858 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
859 continue ;;
860 esac
862 found=no
863 for d in $sysnames; do
864 case "$d" in
865 $add_on/sysdeps/*) ;;
866 *) continue ;;
867 esac
868 (cd "$xsrcdir$d" && for f in *[[!~]]; do
869 case "$f" in
870 sys|bits)
871 for ff in $f/*.h; do
872 test -d "$ff" || { test -e "$ff" && exit 88; }
873 done
874 ;;
875 *)
876 test -d "$f" || { test -e "$f" && exit 88; }
877 ;;
878 esac
879 done)
880 if test $? -eq 88; then
881 found=yes
882 break
883 fi
884 done
885 if test $found = no; then
886 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
887 fi
888 done
889 AC_SUBST(sysdeps_add_ons)
892 ### Locate tools.
894 AC_PROG_INSTALL
895 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
896 # The makefiles need to use a different form to find it in $srcdir.
897 INSTALL='\$(..)./scripts/install-sh -c'
898 fi
899 AC_PROG_LN_S
901 LIBC_PROG_BINUTILS
903 # Accept binutils 2.20 or newer.
904 AC_CHECK_PROG_VER(AS, $AS, --version,
905 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
906 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], AS=: critic_missing="$critic_missing as")
907 AC_CHECK_PROG_VER(LD, $LD, --version,
908 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
909 [2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
911 # These programs are version sensitive.
912 AC_CHECK_TOOL_PREFIX
913 AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
914 [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
915 critic_missing="$critic_missing gcc")
916 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
917 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
918 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
920 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
921 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
922 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
923 MSGFMT=: aux_missing="$aux_missing msgfmt")
924 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
925 [GNU texinfo.* \([0-9][0-9.]*\)],
926 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
927 MAKEINFO=: aux_missing="$aux_missing makeinfo")
928 AC_CHECK_PROG_VER(SED, sed, --version,
929 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
930 [3.0[2-9]*|3.[1-9]*|[4-9]*],
931 SED=: aux_missing="$aux_missing sed")
932 AC_CHECK_PROG_VER(AWK, gawk, --version,
933 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
934 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
936 AC_CHECK_TOOL(NM, nm, false)
938 if test "x$maintainer" = "xyes"; then
939 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
940 case "x$AUTOCONF" in
941 xno|x|x:) AUTOCONF=no ;;
942 *)
943 AC_CACHE_CHECK(dnl
944 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
945 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
946 libc_cv_autoconf_works=yes
947 else
948 libc_cv_autoconf_works=no
949 fi])
950 test $libc_cv_autoconf_works = yes || AUTOCONF=no
951 ;;
952 esac
953 if test "x$AUTOCONF" = xno; then
954 aux_missing="$aux_missing autoconf"
955 fi
956 else
957 AUTOCONF=no
958 fi
960 test -n "$critic_missing" && AC_MSG_ERROR([
961 *** These critical programs are missing or too old:$critic_missing
962 *** Check the INSTALL file for required versions.])
964 test -n "$aux_missing" && AC_MSG_WARN([
965 *** These auxiliary programs are missing or incompatible versions:$aux_missing
966 *** some features will be disabled.
967 *** Check the INSTALL file for required versions.])
969 # if using special system headers, find out the compiler's sekrit
970 # header directory and add that to the list. NOTE: Only does the right
971 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
972 if test -n "$sysheaders"; then
973 SYSINCLUDES=-nostdinc
974 for d in include include-fixed; do
975 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
976 SYSINCLUDES="$SYSINCLUDES -isystem $i"
977 done
978 SYSINCLUDES="$SYSINCLUDES \
979 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
980 if test -n "$CXX"; then
981 CXX_SYSINCLUDES=
982 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
983 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
984 test "x$cxxheaders" != x &&
985 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
986 done
987 fi
988 fi
989 AC_SUBST(SYSINCLUDES)
990 AC_SUBST(CXX_SYSINCLUDES)
992 # Test if LD_LIBRARY_PATH contains the notation for the current directory
993 # since this would lead to problems installing/building glibc.
994 # LD_LIBRARY_PATH contains the current directory if one of the following
995 # is true:
996 # - one of the terminals (":" and ";") is the first or last sign
997 # - two terminals occur directly after each other
998 # - the path contains an element with a dot in it
999 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1000 changequote(,)dnl
1001 case ${LD_LIBRARY_PATH} in
1002 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1003 ld_library_path_setting="contains current directory"
1004 ;;
1005 *)
1006 ld_library_path_setting="ok"
1007 ;;
1008 esac
1009 changequote([,])dnl
1010 AC_MSG_RESULT($ld_library_path_setting)
1011 if test "$ld_library_path_setting" != "ok"; then
1012 AC_MSG_ERROR([
1013 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1014 *** building glibc. Please change the environment variable
1015 *** and run configure again.])
1016 fi
1018 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1019 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1020 libc_cv_gcc_static_libgcc=
1021 else
1022 libc_cv_gcc_static_libgcc=-static-libgcc
1023 fi])
1024 AC_SUBST(libc_cv_gcc_static_libgcc)
1026 AC_PATH_PROG(BASH_SHELL, bash, no)
1028 AC_PATH_PROG(PERL, perl, no)
1029 if test "$PERL" != no &&
1030 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1031 PERL=no
1032 fi
1033 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1034 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1035 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1037 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1038 AC_TRY_COMPILE(dnl
1039 [#define __need_size_t
1040 #define __need_wchar_t
1041 #include <stddef.h>
1042 #define __need_NULL
1043 #include <stddef.h>], [size_t size; wchar_t wchar;
1044 #ifdef offsetof
1045 #error stddef.h ignored __need_*
1046 #endif
1047 if (&size == NULL || &wchar == NULL) abort ();],
1048 libc_cv_friendly_stddef=yes,
1049 libc_cv_friendly_stddef=no)])
1050 if test $libc_cv_friendly_stddef = yes; then
1051 config_vars="$config_vars
1052 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1053 fi
1055 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1056 libc_cv_need_minus_P, [dnl
1057 cat > conftest.S <<EOF
1058 #include "confdefs.h"
1059 /* Nothing whatsoever. */
1060 EOF
1061 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1062 libc_cv_need_minus_P=no
1063 else
1064 libc_cv_need_minus_P=yes
1065 fi
1066 rm -f conftest*])
1067 if test $libc_cv_need_minus_P = yes; then
1068 config_vars="$config_vars
1069 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1070 fi
1072 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1073 cat > conftest.s <<EOF
1074 ${libc_cv_dot_text}
1075 foo:
1076 .set glibc_conftest_frobozz,foo
1077 .globl glibc_conftest_frobozz
1078 EOF
1079 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1080 # (but it doesn't work), so we must do a linking check to be sure.
1081 cat > conftest1.c <<\EOF
1082 extern int glibc_conftest_frobozz;
1083 void _start() { glibc_conftest_frobozz = 1; }
1084 EOF
1085 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1086 -nostartfiles -nostdlib \
1087 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1088 libc_cv_asm_set_directive=yes
1089 else
1090 libc_cv_asm_set_directive=no
1091 fi
1092 rm -f conftest*])
1093 if test $libc_cv_asm_set_directive = yes; then
1094 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1095 fi
1097 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1098 libc_cv_asm_unique_object, [dnl
1099 cat > conftest.s <<EOF
1100 ${libc_cv_dot_text}
1101 _sym:
1102 .type _sym, %gnu_unique_object
1103 EOF
1104 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1105 libc_cv_asm_unique_object=yes
1106 else
1107 libc_cv_asm_unique_object=no
1108 fi
1109 rm -f conftest*])
1110 if test $libc_cv_asm_unique_object = yes; then
1111 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1112 fi
1114 AC_CACHE_CHECK(for .previous assembler directive,
1115 libc_cv_asm_previous_directive, [dnl
1116 cat > conftest.s <<EOF
1117 .section foo_section
1118 .previous
1119 EOF
1120 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1121 libc_cv_asm_previous_directive=yes
1122 else
1123 libc_cv_asm_previous_directive=no
1124 fi
1125 rm -f conftest*])
1126 if test $libc_cv_asm_previous_directive = yes; then
1127 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1128 else
1129 AC_CACHE_CHECK(for .popsection assembler directive,
1130 libc_cv_asm_popsection_directive, [dnl
1131 cat > conftest.s <<EOF
1132 .pushsection foo_section
1133 .popsection
1134 EOF
1135 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1136 libc_cv_asm_popsection_directive=yes
1137 else
1138 libc_cv_asm_popsection_directive=no
1139 fi
1140 rm -f conftest*])
1141 if test $libc_cv_asm_popsection_directive = yes; then
1142 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1143 fi
1144 fi
1145 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1146 libc_cv_asm_protected_directive, [dnl
1147 cat > conftest.s <<EOF
1148 .protected foo
1149 foo:
1150 .hidden bar
1151 bar:
1152 EOF
1153 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1154 libc_cv_asm_protected_directive=yes
1155 else
1156 AC_MSG_ERROR(assembler support for symbol visibility is required)
1157 fi
1158 rm -f conftest*])
1160 if test $libc_cv_asm_protected_directive = yes; then
1161 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1162 libc_cv_visibility_attribute,
1163 [cat > conftest.c <<EOF
1164 int foo __attribute__ ((visibility ("hidden"))) = 1;
1165 int bar __attribute__ ((visibility ("protected"))) = 1;
1166 EOF
1167 libc_cv_visibility_attribute=no
1168 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1169 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1170 if grep '\.protected.*bar' conftest.s >/dev/null; then
1171 libc_cv_visibility_attribute=yes
1172 fi
1173 fi
1174 fi
1175 rm -f conftest.{c,s}
1176 ])
1177 if test $libc_cv_visibility_attribute != yes; then
1178 AC_MSG_ERROR(compiler support for visibility attribute is required)
1179 fi
1180 fi
1182 if test $libc_cv_visibility_attribute = yes; then
1183 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1184 libc_cv_broken_visibility_attribute,
1185 [cat > conftest.c <<EOF
1186 int foo (int x);
1187 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1188 int bar (int x) { return x; }
1189 EOF
1190 libc_cv_broken_visibility_attribute=yes
1191 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1192 changequote(,)dnl
1193 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1194 changequote([,])dnl
1195 libc_cv_broken_visibility_attribute=no
1196 fi
1197 fi
1198 rm -f conftest.c conftest.s
1199 ])
1200 if test $libc_cv_broken_visibility_attribute = yes; then
1201 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1202 fi
1203 fi
1205 AC_CACHE_CHECK(for broken __attribute__((alias())),
1206 libc_cv_broken_alias_attribute,
1207 [cat > conftest.c <<EOF
1208 extern int foo (int x) __asm ("xyzzy");
1209 int bar (int x) { return x; }
1210 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1211 extern int dfoo;
1212 extern __typeof (dfoo) dfoo __asm ("abccb");
1213 int dfoo = 1;
1214 EOF
1215 libc_cv_broken_alias_attribute=yes
1216 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1217 if grep 'xyzzy' conftest.s >/dev/null &&
1218 grep 'abccb' conftest.s >/dev/null; then
1219 libc_cv_broken_alias_attribute=no
1220 fi
1221 fi
1222 rm -f conftest.c conftest.s
1223 ])
1224 if test $libc_cv_broken_alias_attribute = yes; then
1225 AC_MSG_ERROR(working alias attribute support required)
1226 fi
1228 if test $libc_cv_visibility_attribute = yes; then
1229 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1230 libc_cv_have_sdata_section,
1231 [echo "int i;" > conftest.c
1232 libc_cv_have_sdata_section=no
1233 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1234 | grep '\.sdata' >/dev/null; then
1235 libc_cv_have_sdata_section=yes
1236 fi
1237 rm -f conftest.c conftest.so
1238 ])
1239 if test $libc_cv_have_sdata_section = yes; then
1240 AC_DEFINE(HAVE_SDATA_SECTION)
1241 fi
1242 fi
1244 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1245 libc_cv_initfini_array, [dnl
1246 LIBC_TRY_LINK_STATIC([
1247 int foo (void) { return 1; }
1248 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1249 ],
1250 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1251 libc_cv_initfini_array=yes
1252 else
1253 libc_cv_initfini_array=no
1254 fi],
1255 [libc_cv_initfini_array=no])
1256 ])
1257 if test $libc_cv_initfini_array != yes; then
1258 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1259 fi
1261 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1262 libc_cv_ctors_header, [dnl
1263 libc_cv_ctors_header=yes
1264 LIBC_TRY_LINK_STATIC([
1265 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1266 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1267 ],
1268 [dnl
1269 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1270 { gsub(/\@<:@ */, "@<:@") }
1271 $2 == ".ctors" || $2 == ".dtors" {
1272 size = strtonum("0x" $6)
1273 align = strtonum("0x" $NF)
1274 seen@<:@$2@:>@ = 1
1275 stub@<:@$2@:>@ = size == align * 2
1276 }
1277 END {
1278 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1279 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1280 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1281 }
1282 '], [libc_cv_ctors_header=no])
1283 ], [dnl
1284 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1285 ])
1286 ])
1287 if test $libc_cv_ctors_header = no; then
1288 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1289 fi
1291 AC_CACHE_CHECK(for libunwind-support in compiler,
1292 libc_cv_cc_with_libunwind, [
1293 cat > conftest.c <<EOF
1294 int main (void) { return 0; }
1295 EOF
1296 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1297 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1298 libc_cv_cc_with_libunwind=yes
1299 else
1300 libc_cv_cc_with_libunwind=no
1301 fi
1302 rm -f conftest*])
1303 AC_SUBST(libc_cv_cc_with_libunwind)
1304 if test $libc_cv_cc_with_libunwind = yes; then
1305 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1306 fi
1308 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1309 [libc_cv_z_nodelete=yes],
1310 [AC_MSG_ERROR(linker with -z nodelete support required)])
1312 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1313 [libc_cv_z_nodlopen=yes],
1314 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1316 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1317 [libc_cv_z_initfirst=yes],
1318 [AC_MSG_ERROR(linker with -z initfirst support required)])
1320 AC_CACHE_CHECK(for -Bgroup option,
1321 libc_cv_Bgroup, [dnl
1322 cat > conftest.c <<EOF
1323 int _start (void) { return 42; }
1324 EOF
1325 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1326 -fPIC -shared -o conftest.so conftest.c
1327 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1328 then
1329 libc_cv_Bgroup=yes
1330 else
1331 libc_cv_Bgroup=no
1332 fi
1333 rm -f conftest*])
1334 AC_SUBST(libc_cv_Bgroup)
1336 ASFLAGS_config=
1337 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1338 libc_cv_as_noexecstack, [dnl
1339 cat > conftest.c <<EOF
1340 void foo (void) { }
1341 EOF
1342 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1343 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1344 && grep .note.GNU-stack conftest.s >/dev/null \
1345 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1346 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1347 then
1348 libc_cv_as_noexecstack=yes
1349 else
1350 libc_cv_as_noexecstack=no
1351 fi
1352 rm -f conftest*])
1353 if test $libc_cv_as_noexecstack = yes; then
1354 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1355 fi
1356 AC_SUBST(ASFLAGS_config)
1358 AC_CACHE_CHECK(for -z combreloc,
1359 libc_cv_z_combreloc, [dnl
1360 cat > conftest.c <<EOF
1361 extern int bar (int);
1362 extern int mumble;
1363 int foo (void) { return bar (mumble); }
1364 EOF
1365 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1366 -fPIC -shared -o conftest.so conftest.c
1367 -nostdlib -nostartfiles
1368 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1369 then
1370 dnl The following test is a bit weak. We must use a tool which can test
1371 dnl cross-platform since the gcc used can be a cross compiler. Without
1372 dnl introducing new options this is not easily doable. Instead use a tool
1373 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1374 dnl look for a section named .rel.dyn.
1375 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1376 libc_cv_z_combreloc=yes
1377 else
1378 libc_cv_z_combreloc=no
1379 fi
1380 else
1381 libc_cv_z_combreloc=no
1382 fi
1383 rm -f conftest*])
1384 if test "$libc_cv_z_combreloc" = yes; then
1385 AC_DEFINE(HAVE_Z_COMBRELOC)
1386 fi
1387 AC_SUBST(libc_cv_z_combreloc)
1389 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1390 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1391 AC_SUBST(libc_cv_z_execstack)
1393 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1394 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1395 ])
1397 AC_SUBST(libc_cv_fpie)
1399 AC_CACHE_CHECK(for --hash-style option,
1400 libc_cv_hashstyle, [dnl
1401 cat > conftest.c <<EOF
1402 int _start (void) { return 42; }
1403 EOF
1404 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1405 -fPIC -shared -o conftest.so conftest.c
1406 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1407 then
1408 libc_cv_hashstyle=yes
1409 else
1410 libc_cv_hashstyle=no
1411 fi
1412 rm -f conftest*])
1413 AC_SUBST(libc_cv_hashstyle)
1415 # The linker's default -shared behavior is good enough if it
1416 # does these things that our custom linker scripts ensure that
1417 # all allocated NOTE sections come first.
1418 if test "$use_default_link" = default; then
1419 AC_CACHE_CHECK([for sufficient default -shared layout],
1420 libc_cv_use_default_link, [dnl
1421 libc_cv_use_default_link=no
1422 cat > conftest.s <<\EOF
1423 .section .note.a,"a",%note
1424 .balign 4
1425 .long 4,4,9
1426 .string "GNU"
1427 .string "foo"
1428 .section .note.b,"a",%note
1429 .balign 4
1430 .long 4,4,9
1431 .string "GNU"
1432 .string "bar"
1433 EOF
1434 if AC_TRY_COMMAND([dnl
1435 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1436 ac_try=`$READELF -S conftest.so | sed -n \
1437 ['${x;p;}
1438 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1439 t a
1440 b
1441 : a
1442 H']`
1443 then
1444 libc_seen_a=no libc_seen_b=no
1445 set -- $ac_try
1446 while test $# -ge 2 -a "$1" = NOTE; do
1447 case "$2" in
1448 .note.a) libc_seen_a=yes ;;
1449 .note.b) libc_seen_b=yes ;;
1450 esac
1451 shift 2
1452 done
1453 case "$libc_seen_a$libc_seen_b" in
1454 yesyes)
1455 libc_cv_use_default_link=yes
1456 ;;
1457 *)
1458 echo >&AS_MESSAGE_LOG_FD "\
1459 $libc_seen_a$libc_seen_b from:
1460 $ac_try"
1461 ;;
1462 esac
1463 fi
1464 rm -f conftest*])
1465 use_default_link=$libc_cv_use_default_link
1466 fi
1468 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1469 if libc_cv_output_format=`
1470 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1471 then
1472 :
1473 else
1474 libc_cv_output_format=
1475 fi
1476 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1477 AC_SUBST(libc_cv_output_format)
1479 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1480 cat > conftest.c <<EOF
1481 int foo;
1482 EOF
1483 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1484 conftest.c 1>&AS_MESSAGE_LOG_FD])
1485 then
1486 libc_cv_fno_toplevel_reorder=yes
1487 else
1488 libc_cv_fno_toplevel_reorder=no
1489 fi
1490 rm -f conftest*])
1491 if test $libc_cv_fno_toplevel_reorder = yes; then
1492 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1493 else
1494 fno_unit_at_a_time=-fno-unit-at-a-time
1495 fi
1496 AC_SUBST(fno_unit_at_a_time)
1498 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1499 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1500 [libc_cv_ssp=yes],
1501 [libc_cv_ssp=no])
1502 ])
1503 AC_SUBST(libc_cv_ssp)
1505 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1506 cat > conftest.c <<EOF
1507 int foo;
1508 #ifdef __GNUC_GNU_INLINE__
1509 main () { return 0;}
1510 #else
1511 #error
1512 #endif
1513 EOF
1514 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1515 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1516 then
1517 libc_cv_gnu89_inline=yes
1518 else
1519 libc_cv_gnu89_inline=no
1520 fi
1521 rm -f conftest*])
1522 if test $libc_cv_gnu89_inline = yes; then
1523 gnu89_inline=-fgnu89-inline
1524 else
1525 gnu89_inline=
1526 fi
1527 AC_SUBST(gnu89_inline)
1529 AC_CACHE_CHECK(whether cc puts quotes around section names,
1530 libc_cv_have_section_quotes,
1531 [cat > conftest.c <<EOF
1532 static const int foo
1533 __attribute__ ((section ("bar"))) = 1;
1534 EOF
1535 if ${CC-cc} -S conftest.c -o conftest.s; then
1536 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1537 libc_cv_have_section_quotes=yes
1538 else
1539 libc_cv_have_section_quotes=no
1540 fi
1541 else
1542 libc_cv_have_section_quotes=unknown
1543 fi
1544 rm -f conftest.{c,s}
1545 ])
1546 if test $libc_cv_have_section_quotes = yes; then
1547 AC_DEFINE(HAVE_SECTION_QUOTES)
1548 fi
1550 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1551 [dnl
1552 cat > conftest.s <<EOF
1553 ${libc_cv_dot_text}
1554 .globl foo
1555 foo:
1556 .weak foo
1557 .weak bar; bar = foo
1558 EOF
1559 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1560 libc_cv_asm_weak_directive=yes
1561 else
1562 libc_cv_asm_weak_directive=no
1563 fi
1564 rm -f conftest*])
1566 if test $libc_cv_asm_weak_directive = no; then
1567 AC_CACHE_CHECK(for assembler .weakext directive,
1568 libc_cv_asm_weakext_directive,
1569 [dnl
1570 cat > conftest.s <<EOF
1571 ${libc_cv_dot_text}
1572 .globl foo
1573 foo:
1574 .weakext bar foo
1575 .weakext baz
1576 .globl baz
1577 baz:
1578 EOF
1579 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1580 libc_cv_asm_weakext_directive=yes
1581 else
1582 libc_cv_asm_weakext_directive=no
1583 fi
1584 rm -f conftest*])
1586 fi # no .weak
1588 if test $libc_cv_asm_weak_directive = yes; then
1589 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1590 elif test $libc_cv_asm_weakext_directive = yes; then
1591 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1592 fi
1594 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1595 cat > conftest.c <<\EOF
1596 _start () {}
1597 int __eh_pc;
1598 __throw () {}
1599 EOF
1600 dnl No \ in command here because it ends up inside ''.
1601 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1602 -nostdlib -nostartfiles -Wl,--no-whole-archive
1603 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1604 libc_cv_ld_no_whole_archive=yes
1605 else
1606 libc_cv_ld_no_whole_archive=no
1607 fi
1608 rm -f conftest*])
1609 if test $libc_cv_ld_no_whole_archive = no; then
1610 AC_MSG_ERROR([support for --no-whole-archive is needed])
1611 fi
1613 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1614 cat > conftest.c <<\EOF
1615 _start () {}
1616 int __eh_pc;
1617 __throw () {}
1618 EOF
1619 dnl No \ in command here because it ends up inside ''.
1620 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1621 -nostdlib -nostartfiles -fexceptions
1622 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1623 libc_cv_gcc_exceptions=yes
1624 else
1625 libc_cv_gcc_exceptions=no
1626 fi
1627 rm -f conftest*])
1628 if test $libc_cv_gcc_exceptions = yes; then
1629 exceptions=-fexceptions
1630 fi
1631 AC_SUBST(exceptions)dnl
1633 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1634 cat > conftest.c <<\EOF
1635 void zero (void *x)
1636 {
1637 __builtin_memset (x, 0, 1000);
1638 }
1639 EOF
1640 dnl
1641 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1642 then
1643 libc_cv_gcc_builtin_memset=no
1644 else
1645 libc_cv_gcc_builtin_memset=yes
1646 fi
1647 rm -f conftest* ])
1648 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1649 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1650 fi
1652 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1653 cat > conftest.c <<\EOF
1654 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1655 char *foo (const char *a, const char *b)
1656 {
1657 return __builtin_strstr (a, b);
1658 }
1659 EOF
1660 dnl
1661 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1662 then
1663 libc_cv_gcc_builtin_redirection=yes
1664 else
1665 libc_cv_gcc_builtin_redirection=no
1666 fi
1667 rm -f conftest* ])
1668 if test "$libc_cv_gcc_builtin_redirection" = no; then
1669 AC_MSG_ERROR([support for the symbol redirection needed])
1670 fi
1672 dnl Check whether the compiler supports the __thread keyword.
1673 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1674 [cat > conftest.c <<\EOF
1675 __thread int a = 42;
1676 EOF
1677 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1678 libc_cv_gcc___thread=yes
1679 else
1680 libc_cv_gcc___thread=no
1681 fi
1682 rm -f conftest*])
1683 if test "$libc_cv_gcc___thread" = no; then
1684 AC_MSG_ERROR([support for the __thread keyword is required])
1685 fi
1687 dnl Check whether the compiler supports the tls_model attribute.
1688 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1689 cat > conftest.c <<\EOF
1690 extern __thread int a __attribute__((tls_model ("initial-exec")));
1691 EOF
1692 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1693 libc_cv_gcc_tls_model_attr=yes
1694 else
1695 libc_cv_gcc_tls_model_attr=no
1696 fi
1697 rm -f conftest*])
1698 if test "$libc_cv_gcc_tls_model_attr" = no; then
1699 AC_MSG_ERROR([support for the tls_model attribute is required])
1700 fi
1702 dnl Determine how to disable generation of FMA instructions.
1703 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1704 libc_cv_cc_nofma, [dnl
1705 libc_cv_cc_nofma=
1706 for opt in -ffp-contract=off -mno-fused-madd; do
1707 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1708 done])
1709 AC_SUBST(libc_cv_cc_nofma)
1711 if test -n "$submachine"; then
1712 AC_CACHE_CHECK([for compiler option for CPU variant],
1713 libc_cv_cc_submachine, [dnl
1714 libc_cv_cc_submachine=no
1715 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1716 LIBC_TRY_CC_OPTION([$opt], [
1717 libc_cv_cc_submachine="$opt"
1718 break], [])
1719 done])
1720 if test "x$libc_cv_cc_submachine" = xno; then
1721 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1722 fi
1723 fi
1724 AC_SUBST(libc_cv_cc_submachine)
1726 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1727 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1728 cat > conftest.c <<EOF
1729 void
1730 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1731 foo (void) {}
1732 EOF
1733 libc_cv_cc_loop_to_function=no
1734 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1735 then
1736 libc_cv_cc_loop_to_function=yes
1737 fi
1738 rm -f conftest*])
1739 if test $libc_cv_cc_loop_to_function = yes; then
1740 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1741 fi
1742 AC_SUBST(libc_cv_cc_loop_to_function)
1744 dnl Check whether we have the gd library available.
1745 AC_MSG_CHECKING(for libgd)
1746 if test "$with_gd" != "no"; then
1747 old_CFLAGS="$CFLAGS"
1748 CFLAGS="$CFLAGS $libgd_include"
1749 old_LDFLAGS="$LDFLAGS"
1750 LDFLAGS="$LDFLAGS $libgd_ldflags"
1751 old_LIBS="$LIBS"
1752 LIBS="$LIBS -lgd -lpng -lz -lm"
1753 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1754 CFLAGS="$old_CFLAGS"
1755 LDFLAGS="$old_LDFLAGS"
1756 LIBS="$old_LIBS"
1757 else
1758 LIBGD=no
1759 fi
1760 AC_MSG_RESULT($LIBGD)
1761 AC_SUBST(LIBGD)
1763 # SELinux detection
1764 if test x$with_selinux = xno ; then
1765 have_selinux=no;
1766 else
1767 # See if we have the SELinux library
1768 AC_CHECK_LIB(selinux, is_selinux_enabled,
1769 have_selinux=yes, have_selinux=no)
1770 if test x$with_selinux = xyes ; then
1771 if test x$have_selinux = xno ; then
1772 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1773 fi
1774 fi
1775 fi
1776 # Check if we're building with SELinux support.
1777 if test "x$have_selinux" = xyes; then
1778 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1780 # See if we have the libaudit library
1781 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1782 have_libaudit=yes, have_libaudit=no)
1783 if test "x$have_libaudit" = xyes; then
1784 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1785 fi
1786 AC_SUBST(have_libaudit)
1788 # See if we have the libcap library
1789 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1790 if test "x$have_libcap" = xyes; then
1791 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1792 fi
1793 AC_SUBST(have_libcap)
1794 fi
1795 AC_SUBST(have_selinux)
1797 dnl check for the size of 'long double'.
1798 AC_CHECK_SIZEOF(long double, 0)
1799 sizeof_long_double=$ac_cv_sizeof_long_double
1800 AC_SUBST(sizeof_long_double)
1802 CPPUNDEFS=
1803 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1804 dnl Since we are building the implementations of the fortified functions here,
1805 dnl having the macro defined interacts very badly.
1806 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1807 [AC_TRY_COMPILE([], [
1808 #ifdef _FORTIFY_SOURCE
1809 # error bogon
1810 #endif],
1811 [libc_cv_predef_fortify_source=no],
1812 [libc_cv_predef_fortify_source=yes])])
1813 if test $libc_cv_predef_fortify_source = yes; then
1814 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1815 fi
1816 AC_SUBST(CPPUNDEFS)
1818 dnl Check for silly hacked compilers inserting -fstack-protector.
1819 dnl This breaks badly for the early startup code we compile, since
1820 dnl the compiled code can refer to a magic machine-dependent location
1821 dnl for the canary value before we have sufficient setup for that to
1822 dnl work. It's also questionable to build all of libc with this flag
1823 dnl even when you're doing that for most applications you build, since
1824 dnl libc's code is so heavily-used and performance-sensitive. If we
1825 dnl ever really want to make that work, it should be enabled explicitly
1826 dnl in the libc build, not inherited from implicit compiler settings.
1827 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1828 libc_cv_predef_stack_protector, [
1829 AC_TRY_COMPILE([extern void foobar (char *);],
1830 [char large_array[2048]; foobar (large_array);], [
1831 libc_undefs=`$NM -u conftest.o |
1832 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1833 2>&AS_MESSAGE_LOG_FD` || {
1834 AC_MSG_ERROR([confusing output from $NM -u])
1835 }
1836 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1837 # On some architectures, there are architecture-specific undefined
1838 # symbols (resolved by the linker), so filter out unknown symbols.
1839 # This will fail to produce the correct result if the compiler
1840 # defaults to -fstack-protector but this produces an undefined symbol
1841 # other than __stack_chk_fail. However, compilers like that have not
1842 # been encountered in practice.
1843 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1844 case "$libc_undefs" in
1845 foobar) libc_cv_predef_stack_protector=no ;;
1846 '__stack_chk_fail
1847 foobar') libc_cv_predef_stack_protector=yes ;;
1848 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1849 esac],
1850 [AC_MSG_ERROR([test compilation failed])])
1851 ])
1852 libc_extra_cflags=
1853 if test $libc_cv_predef_stack_protector = yes; then
1854 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1855 fi
1856 libc_extra_cppflags=
1858 # Some linkers on some architectures support __ehdr_start but with
1859 # bugs. Make sure usage of it does not create relocations in the
1860 # output (as the linker should resolve them all for us).
1861 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1862 libc_cv_ehdr_start, [
1863 old_CFLAGS="$CFLAGS"
1864 old_LDFLAGS="$LDFLAGS"
1865 old_LIBS="$LIBS"
1866 CFLAGS="$CFLAGS -fPIC"
1867 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1868 LIBS=
1869 AC_LINK_IFELSE([AC_LANG_SOURCE([
1870 typedef struct {
1871 char foo;
1872 long val;
1873 } Ehdr;
1874 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1875 long ehdr (void) { return __ehdr_start.val; }
1876 ])],
1877 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1878 libc_cv_ehdr_start=broken
1879 else
1880 libc_cv_ehdr_start=yes
1881 fi], [libc_cv_ehdr_start=no])
1882 CFLAGS="$old_CFLAGS"
1883 LDFLAGS="$old_LDFLAGS"
1884 LIBS="$old_LIBS"
1885 ])
1886 if test "$libc_cv_ehdr_start" = yes; then
1887 AC_DEFINE([HAVE_EHDR_START])
1888 elif test "$libc_cv_ehdr_start" = broken; then
1889 AC_MSG_WARN([linker is broken -- you should upgrade])
1890 fi
1892 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1893 libc_cv_builtin_trap, [dnl
1894 libc_cv_builtin_trap=no
1895 AC_TRY_COMPILE([], [__builtin_trap ()], [
1896 libc_undefs=`$NM -u conftest.o |
1897 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1898 2>&AS_MESSAGE_LOG_FD` || {
1899 AC_MSG_ERROR([confusing output from $NM -u])
1900 }
1901 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1902 if test -z "$libc_undefs"; then
1903 libc_cv_builtin_trap=yes
1904 fi])])
1905 if test $libc_cv_builtin_trap = yes; then
1906 AC_DEFINE([HAVE_BUILTIN_TRAP])
1907 fi
1909 ### End of automated tests.
1910 ### Now run sysdeps configure fragments.
1912 # They also can set these variables.
1913 use_ldconfig=no
1914 ldd_rewrite_script=no
1915 libc_cv_sysconfdir=$sysconfdir
1916 libc_cv_localstatedir=$localstatedir
1917 libc_cv_gcc_unwind_find_fde=no
1918 libc_cv_idn=no
1920 # Iterate over all the sysdep directories we will use, running their
1921 # configure fragments.
1922 for dir in $sysnames; do
1923 case $dir in
1924 /*) dest=$dir ;;
1925 *) dest=$srcdir/$dir ;;
1926 esac
1927 if test -r $dest/configure; then
1928 AC_MSG_RESULT(running configure fragment for $dir)
1929 . $dest/configure
1930 fi
1931 done
1933 AC_SUBST(libc_extra_cflags)
1934 AC_SUBST(libc_extra_cppflags)
1936 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1937 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1938 fi
1939 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1941 # A sysdeps configure fragment can reset this if IFUNC is not actually
1942 # usable even though the assembler knows how to generate the symbol type.
1943 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1944 AC_DEFINE(HAVE_IFUNC)
1945 fi
1947 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1948 # configure fragment can override the value to prevent this AC_DEFINE.
1949 AC_SUBST(use_nscd)
1950 if test "x$use_nscd" != xno; then
1951 AC_DEFINE([USE_NSCD])
1952 fi
1953 if test "x$build_nscd" = xdefault; then
1954 build_nscd=$use_nscd
1955 fi
1957 # Test for old glibc 2.0.x headers so that they can be removed properly
1958 # Search only in includedir.
1959 AC_MSG_CHECKING(for old glibc 2.0.x headers)
1960 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
1961 then
1962 old_glibc_headers=yes
1963 else
1964 old_glibc_headers=no
1965 fi
1966 AC_MSG_RESULT($old_glibc_headers)
1967 if test ${old_glibc_headers} = yes; then
1968 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
1969 AC_MSG_WARN(*** be removed.)
1970 fi
1971 AC_SUBST(old_glibc_headers)
1973 AC_SUBST(libc_cv_slibdir)
1974 AC_SUBST(libc_cv_rtlddir)
1975 AC_SUBST(libc_cv_localedir)
1976 AC_SUBST(libc_cv_sysconfdir)
1977 AC_SUBST(libc_cv_localstatedir)
1978 AC_SUBST(libc_cv_rootsbindir)
1979 AC_SUBST(libc_cv_forced_unwind)
1981 if test x$use_ldconfig = xyes; then
1982 AC_DEFINE(USE_LDCONFIG)
1983 fi
1984 AC_SUBST(use_ldconfig)
1985 AC_SUBST(ldd_rewrite_script)
1987 AC_SUBST(static)
1988 AC_SUBST(shared)
1990 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1991 [libc_cv_pic_default=yes
1992 cat > conftest.c <<EOF
1993 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1994 # error PIC is default.
1995 #endif
1996 EOF
1997 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1998 libc_cv_pic_default=no
1999 fi
2000 rm -f conftest.*])
2001 AC_SUBST(libc_cv_pic_default)
2003 AC_SUBST(profile)
2004 AC_SUBST(static_nss)
2006 AC_SUBST(DEFINES)
2008 dnl See sysdeps/mach/configure.ac for this variable.
2009 AC_SUBST(mach_interface_list)
2011 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2012 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2013 AC_SUBST(VERSION)
2014 AC_SUBST(RELEASE)
2016 AC_CONFIG_FILES([config.make Makefile])
2017 AC_CONFIG_COMMANDS([default],[[
2018 case $CONFIG_FILES in *config.make*)
2019 echo "$config_vars" >> config.make;;
2020 esac
2021 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2022 AC_OUTPUT