| blob | a982407d480f01cb10b4256b8f7286b01f4841a1 |
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 2.22 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[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
907 AS=: critic_missing="$critic_missing as")
908 AC_CHECK_PROG_VER(LD, $LD, --version,
909 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
910 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
911 LD=: critic_missing="$critic_missing ld")
913 # These programs are version sensitive.
914 AC_CHECK_TOOL_PREFIX
915 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
916 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
917 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
919 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
920 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
921 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
922 MSGFMT=: aux_missing="$aux_missing msgfmt")
923 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
924 [GNU texinfo.* \([0-9][0-9.]*\)],
925 [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
926 MAKEINFO=: aux_missing="$aux_missing makeinfo")
927 AC_CHECK_PROG_VER(SED, sed, --version,
928 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
929 [3.0[2-9]*|3.[1-9]*|[4-9]*],
930 SED=: aux_missing="$aux_missing sed")
931 AC_CHECK_PROG_VER(AWK, gawk, --version,
932 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
933 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
935 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
936 AC_TRY_COMPILE([], [
937 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 4)
938 #error insufficient compiler
939 #endif],
940 [libc_cv_compiler_ok=yes],
941 [libc_cv_compiler_ok=no])])
942 AS_IF([test $libc_cv_compiler_ok != yes],
943 [critic_missing="$critic_missing compiler"])
945 AC_CHECK_TOOL(NM, nm, false)
947 if test "x$maintainer" = "xyes"; then
948 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
949 case "x$AUTOCONF" in
950 xno|x|x:) AUTOCONF=no ;;
951 *)
952 AC_CACHE_CHECK(dnl
953 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
954 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
955 libc_cv_autoconf_works=yes
956 else
957 libc_cv_autoconf_works=no
958 fi])
959 test $libc_cv_autoconf_works = yes || AUTOCONF=no
960 ;;
961 esac
962 if test "x$AUTOCONF" = xno; then
963 aux_missing="$aux_missing autoconf"
964 fi
965 else
966 AUTOCONF=no
967 fi
969 test -n "$critic_missing" && AC_MSG_ERROR([
970 *** These critical programs are missing or too old:$critic_missing
971 *** Check the INSTALL file for required versions.])
973 test -n "$aux_missing" && AC_MSG_WARN([
974 *** These auxiliary programs are missing or incompatible versions:$aux_missing
975 *** some features will be disabled.
976 *** Check the INSTALL file for required versions.])
978 # if using special system headers, find out the compiler's sekrit
979 # header directory and add that to the list. NOTE: Only does the right
980 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
981 if test -n "$sysheaders"; then
982 SYSINCLUDES=-nostdinc
983 for d in include include-fixed; do
984 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
985 SYSINCLUDES="$SYSINCLUDES -isystem $i"
986 done
987 SYSINCLUDES="$SYSINCLUDES \
988 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
989 if test -n "$CXX"; then
990 CXX_SYSINCLUDES=
991 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
992 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
993 test "x$cxxheaders" != x &&
994 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
995 done
996 fi
997 fi
998 AC_SUBST(SYSINCLUDES)
999 AC_SUBST(CXX_SYSINCLUDES)
1001 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1002 # since this would lead to problems installing/building glibc.
1003 # LD_LIBRARY_PATH contains the current directory if one of the following
1004 # is true:
1005 # - one of the terminals (":" and ";") is the first or last sign
1006 # - two terminals occur directly after each other
1007 # - the path contains an element with a dot in it
1008 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1009 changequote(,)dnl
1010 case ${LD_LIBRARY_PATH} in
1011 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1012 ld_library_path_setting="contains current directory"
1013 ;;
1014 *)
1015 ld_library_path_setting="ok"
1016 ;;
1017 esac
1018 changequote([,])dnl
1019 AC_MSG_RESULT($ld_library_path_setting)
1020 if test "$ld_library_path_setting" != "ok"; then
1021 AC_MSG_ERROR([
1022 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1023 *** building glibc. Please change the environment variable
1024 *** and run configure again.])
1025 fi
1027 AC_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
1028 if $CC -v -static-libgcc 2>&1 | grep 'unrecognized option.*static-libgcc' >/dev/null; then
1029 libc_cv_gcc_static_libgcc=
1030 else
1031 libc_cv_gcc_static_libgcc=-static-libgcc
1032 fi])
1033 AC_SUBST(libc_cv_gcc_static_libgcc)
1035 AC_PATH_PROG(BASH_SHELL, bash, no)
1037 AC_PATH_PROG(PERL, perl, no)
1038 if test "$PERL" != no &&
1039 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1040 PERL=no
1041 fi
1042 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1043 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1044 AC_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
1046 AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
1047 AC_TRY_COMPILE(dnl
1048 [#define __need_size_t
1049 #define __need_wchar_t
1050 #include <stddef.h>
1051 #define __need_NULL
1052 #include <stddef.h>], [size_t size; wchar_t wchar;
1053 #ifdef offsetof
1054 #error stddef.h ignored __need_*
1055 #endif
1056 if (&size == NULL || &wchar == NULL) abort ();],
1057 libc_cv_friendly_stddef=yes,
1058 libc_cv_friendly_stddef=no)])
1059 if test $libc_cv_friendly_stddef = yes; then
1060 config_vars="$config_vars
1061 override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
1062 fi
1064 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1065 libc_cv_need_minus_P, [dnl
1066 cat > conftest.S <<EOF
1067 #include "confdefs.h"
1068 /* Nothing whatsoever. */
1069 EOF
1070 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1071 libc_cv_need_minus_P=no
1072 else
1073 libc_cv_need_minus_P=yes
1074 fi
1075 rm -f conftest*])
1076 if test $libc_cv_need_minus_P = yes; then
1077 config_vars="$config_vars
1078 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1079 fi
1081 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1082 cat > conftest.s <<EOF
1083 ${libc_cv_dot_text}
1084 foo:
1085 .set glibc_conftest_frobozz,foo
1086 .globl glibc_conftest_frobozz
1087 EOF
1088 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1089 # (but it doesn't work), so we must do a linking check to be sure.
1090 cat > conftest1.c <<\EOF
1091 extern int glibc_conftest_frobozz;
1092 void _start() { glibc_conftest_frobozz = 1; }
1093 EOF
1094 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1095 -nostartfiles -nostdlib \
1096 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1097 libc_cv_asm_set_directive=yes
1098 else
1099 libc_cv_asm_set_directive=no
1100 fi
1101 rm -f conftest*])
1102 if test $libc_cv_asm_set_directive = yes; then
1103 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1104 fi
1106 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1107 libc_cv_asm_unique_object, [dnl
1108 cat > conftest.s <<EOF
1109 ${libc_cv_dot_text}
1110 _sym:
1111 .type _sym, %gnu_unique_object
1112 EOF
1113 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1114 libc_cv_asm_unique_object=yes
1115 else
1116 libc_cv_asm_unique_object=no
1117 fi
1118 rm -f conftest*])
1119 if test $libc_cv_asm_unique_object = yes; then
1120 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1121 fi
1123 AC_CACHE_CHECK(for .previous assembler directive,
1124 libc_cv_asm_previous_directive, [dnl
1125 cat > conftest.s <<EOF
1126 .section foo_section
1127 .previous
1128 EOF
1129 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1130 libc_cv_asm_previous_directive=yes
1131 else
1132 libc_cv_asm_previous_directive=no
1133 fi
1134 rm -f conftest*])
1135 if test $libc_cv_asm_previous_directive = yes; then
1136 AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
1137 else
1138 AC_CACHE_CHECK(for .popsection assembler directive,
1139 libc_cv_asm_popsection_directive, [dnl
1140 cat > conftest.s <<EOF
1141 .pushsection foo_section
1142 .popsection
1143 EOF
1144 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1145 libc_cv_asm_popsection_directive=yes
1146 else
1147 libc_cv_asm_popsection_directive=no
1148 fi
1149 rm -f conftest*])
1150 if test $libc_cv_asm_popsection_directive = yes; then
1151 AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
1152 fi
1153 fi
1154 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1155 libc_cv_asm_protected_directive, [dnl
1156 cat > conftest.s <<EOF
1157 .protected foo
1158 foo:
1159 .hidden bar
1160 bar:
1161 EOF
1162 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1163 libc_cv_asm_protected_directive=yes
1164 else
1165 AC_MSG_ERROR(assembler support for symbol visibility is required)
1166 fi
1167 rm -f conftest*])
1169 if test $libc_cv_asm_protected_directive = yes; then
1170 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1171 libc_cv_visibility_attribute,
1172 [cat > conftest.c <<EOF
1173 int foo __attribute__ ((visibility ("hidden"))) = 1;
1174 int bar __attribute__ ((visibility ("protected"))) = 1;
1175 EOF
1176 libc_cv_visibility_attribute=no
1177 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1178 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1179 if grep '\.protected.*bar' conftest.s >/dev/null; then
1180 libc_cv_visibility_attribute=yes
1181 fi
1182 fi
1183 fi
1184 rm -f conftest.{c,s}
1185 ])
1186 if test $libc_cv_visibility_attribute != yes; then
1187 AC_MSG_ERROR(compiler support for visibility attribute is required)
1188 fi
1189 fi
1191 if test $libc_cv_visibility_attribute = yes; then
1192 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1193 libc_cv_broken_visibility_attribute,
1194 [cat > conftest.c <<EOF
1195 int foo (int x);
1196 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1197 int bar (int x) { return x; }
1198 EOF
1199 libc_cv_broken_visibility_attribute=yes
1200 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1201 changequote(,)dnl
1202 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1203 changequote([,])dnl
1204 libc_cv_broken_visibility_attribute=no
1205 fi
1206 fi
1207 rm -f conftest.c conftest.s
1208 ])
1209 if test $libc_cv_broken_visibility_attribute = yes; then
1210 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1211 fi
1212 fi
1214 AC_CACHE_CHECK(for broken __attribute__((alias())),
1215 libc_cv_broken_alias_attribute,
1216 [cat > conftest.c <<EOF
1217 extern int foo (int x) __asm ("xyzzy");
1218 int bar (int x) { return x; }
1219 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1220 extern int dfoo;
1221 extern __typeof (dfoo) dfoo __asm ("abccb");
1222 int dfoo = 1;
1223 EOF
1224 libc_cv_broken_alias_attribute=yes
1225 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1226 if grep 'xyzzy' conftest.s >/dev/null &&
1227 grep 'abccb' conftest.s >/dev/null; then
1228 libc_cv_broken_alias_attribute=no
1229 fi
1230 fi
1231 rm -f conftest.c conftest.s
1232 ])
1233 if test $libc_cv_broken_alias_attribute = yes; then
1234 AC_MSG_ERROR(working alias attribute support required)
1235 fi
1237 if test $libc_cv_visibility_attribute = yes; then
1238 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1239 libc_cv_have_sdata_section,
1240 [echo "int i;" > conftest.c
1241 libc_cv_have_sdata_section=no
1242 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1243 | grep '\.sdata' >/dev/null; then
1244 libc_cv_have_sdata_section=yes
1245 fi
1246 rm -f conftest.c conftest.so
1247 ])
1248 if test $libc_cv_have_sdata_section = yes; then
1249 AC_DEFINE(HAVE_SDATA_SECTION)
1250 fi
1251 fi
1253 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1254 libc_cv_initfini_array, [dnl
1255 LIBC_TRY_LINK_STATIC([
1256 int foo (void) { return 1; }
1257 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1258 ],
1259 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1260 libc_cv_initfini_array=yes
1261 else
1262 libc_cv_initfini_array=no
1263 fi],
1264 [libc_cv_initfini_array=no])
1265 ])
1266 if test $libc_cv_initfini_array != yes; then
1267 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1268 fi
1270 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1271 libc_cv_ctors_header, [dnl
1272 libc_cv_ctors_header=yes
1273 LIBC_TRY_LINK_STATIC([
1274 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1275 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1276 ],
1277 [dnl
1278 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1279 { gsub(/\@<:@ */, "@<:@") }
1280 $2 == ".ctors" || $2 == ".dtors" {
1281 size = strtonum("0x" $6)
1282 align = strtonum("0x" $NF)
1283 seen@<:@$2@:>@ = 1
1284 stub@<:@$2@:>@ = size == align * 2
1285 }
1286 END {
1287 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1288 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1289 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1290 }
1291 '], [libc_cv_ctors_header=no])
1292 ], [dnl
1293 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1294 ])
1295 ])
1296 if test $libc_cv_ctors_header = no; then
1297 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1298 fi
1300 AC_CACHE_CHECK(for libunwind-support in compiler,
1301 libc_cv_cc_with_libunwind, [
1302 cat > conftest.c <<EOF
1303 int main (void) { return 0; }
1304 EOF
1305 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1306 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1307 libc_cv_cc_with_libunwind=yes
1308 else
1309 libc_cv_cc_with_libunwind=no
1310 fi
1311 rm -f conftest*])
1312 AC_SUBST(libc_cv_cc_with_libunwind)
1313 if test $libc_cv_cc_with_libunwind = yes; then
1314 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1315 fi
1317 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1318 [libc_cv_z_nodelete=yes],
1319 [AC_MSG_ERROR(linker with -z nodelete support required)])
1321 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1322 [libc_cv_z_nodlopen=yes],
1323 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1325 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1326 [libc_cv_z_initfirst=yes],
1327 [AC_MSG_ERROR(linker with -z initfirst support required)])
1329 AC_CACHE_CHECK(for -Bgroup option,
1330 libc_cv_Bgroup, [dnl
1331 cat > conftest.c <<EOF
1332 int _start (void) { return 42; }
1333 EOF
1334 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1335 -fPIC -shared -o conftest.so conftest.c
1336 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1337 then
1338 libc_cv_Bgroup=yes
1339 else
1340 libc_cv_Bgroup=no
1341 fi
1342 rm -f conftest*])
1343 AC_SUBST(libc_cv_Bgroup)
1345 ASFLAGS_config=
1346 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1347 libc_cv_as_noexecstack, [dnl
1348 cat > conftest.c <<EOF
1349 void foo (void) { }
1350 EOF
1351 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1352 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1353 && grep .note.GNU-stack conftest.s >/dev/null \
1354 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1355 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1356 then
1357 libc_cv_as_noexecstack=yes
1358 else
1359 libc_cv_as_noexecstack=no
1360 fi
1361 rm -f conftest*])
1362 if test $libc_cv_as_noexecstack = yes; then
1363 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1364 fi
1365 AC_SUBST(ASFLAGS_config)
1367 AC_CACHE_CHECK(for -z combreloc,
1368 libc_cv_z_combreloc, [dnl
1369 cat > conftest.c <<EOF
1370 extern int bar (int);
1371 extern int mumble;
1372 int foo (void) { return bar (mumble); }
1373 EOF
1374 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1375 -fPIC -shared -o conftest.so conftest.c
1376 -nostdlib -nostartfiles
1377 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1378 then
1379 dnl The following test is a bit weak. We must use a tool which can test
1380 dnl cross-platform since the gcc used can be a cross compiler. Without
1381 dnl introducing new options this is not easily doable. Instead use a tool
1382 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1383 dnl look for a section named .rel.dyn.
1384 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1385 libc_cv_z_combreloc=yes
1386 else
1387 libc_cv_z_combreloc=no
1388 fi
1389 else
1390 libc_cv_z_combreloc=no
1391 fi
1392 rm -f conftest*])
1393 if test "$libc_cv_z_combreloc" = yes; then
1394 AC_DEFINE(HAVE_Z_COMBRELOC)
1395 fi
1396 AC_SUBST(libc_cv_z_combreloc)
1398 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1399 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1400 AC_SUBST(libc_cv_z_execstack)
1402 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1403 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1404 ])
1406 AC_SUBST(libc_cv_fpie)
1408 AC_CACHE_CHECK(for --hash-style option,
1409 libc_cv_hashstyle, [dnl
1410 cat > conftest.c <<EOF
1411 int _start (void) { return 42; }
1412 EOF
1413 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1414 -fPIC -shared -o conftest.so conftest.c
1415 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1416 then
1417 libc_cv_hashstyle=yes
1418 else
1419 libc_cv_hashstyle=no
1420 fi
1421 rm -f conftest*])
1422 AC_SUBST(libc_cv_hashstyle)
1424 # The linker's default -shared behavior is good enough if it
1425 # does these things that our custom linker scripts ensure that
1426 # all allocated NOTE sections come first.
1427 if test "$use_default_link" = default; then
1428 AC_CACHE_CHECK([for sufficient default -shared layout],
1429 libc_cv_use_default_link, [dnl
1430 libc_cv_use_default_link=no
1431 cat > conftest.s <<\EOF
1432 .section .note.a,"a",%note
1433 .balign 4
1434 .long 4,4,9
1435 .string "GNU"
1436 .string "foo"
1437 .section .note.b,"a",%note
1438 .balign 4
1439 .long 4,4,9
1440 .string "GNU"
1441 .string "bar"
1442 EOF
1443 if AC_TRY_COMMAND([dnl
1444 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1445 ac_try=`$READELF -S conftest.so | sed -n \
1446 ['${x;p;}
1447 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1448 t a
1449 b
1450 : a
1451 H']`
1452 then
1453 libc_seen_a=no libc_seen_b=no
1454 set -- $ac_try
1455 while test $# -ge 2 -a "$1" = NOTE; do
1456 case "$2" in
1457 .note.a) libc_seen_a=yes ;;
1458 .note.b) libc_seen_b=yes ;;
1459 esac
1460 shift 2
1461 done
1462 case "$libc_seen_a$libc_seen_b" in
1463 yesyes)
1464 libc_cv_use_default_link=yes
1465 ;;
1466 *)
1467 echo >&AS_MESSAGE_LOG_FD "\
1468 $libc_seen_a$libc_seen_b from:
1469 $ac_try"
1470 ;;
1471 esac
1472 fi
1473 rm -f conftest*])
1474 use_default_link=$libc_cv_use_default_link
1475 fi
1477 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1478 if libc_cv_output_format=`
1479 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1480 then
1481 :
1482 else
1483 libc_cv_output_format=
1484 fi
1485 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1486 AC_SUBST(libc_cv_output_format)
1488 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1489 cat > conftest.c <<EOF
1490 int foo;
1491 EOF
1492 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1493 conftest.c 1>&AS_MESSAGE_LOG_FD])
1494 then
1495 libc_cv_fno_toplevel_reorder=yes
1496 else
1497 libc_cv_fno_toplevel_reorder=no
1498 fi
1499 rm -f conftest*])
1500 if test $libc_cv_fno_toplevel_reorder = yes; then
1501 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1502 else
1503 fno_unit_at_a_time=-fno-unit-at-a-time
1504 fi
1505 AC_SUBST(fno_unit_at_a_time)
1507 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1508 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1509 [libc_cv_ssp=yes],
1510 [libc_cv_ssp=no])
1511 ])
1512 AC_SUBST(libc_cv_ssp)
1514 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1515 cat > conftest.c <<EOF
1516 int foo;
1517 #ifdef __GNUC_GNU_INLINE__
1518 main () { return 0;}
1519 #else
1520 #error
1521 #endif
1522 EOF
1523 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1524 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1525 then
1526 libc_cv_gnu89_inline=yes
1527 else
1528 libc_cv_gnu89_inline=no
1529 fi
1530 rm -f conftest*])
1531 if test $libc_cv_gnu89_inline = yes; then
1532 gnu89_inline=-fgnu89-inline
1533 else
1534 gnu89_inline=
1535 fi
1536 AC_SUBST(gnu89_inline)
1538 AC_CACHE_CHECK(whether cc puts quotes around section names,
1539 libc_cv_have_section_quotes,
1540 [cat > conftest.c <<EOF
1541 static const int foo
1542 __attribute__ ((section ("bar"))) = 1;
1543 EOF
1544 if ${CC-cc} -S conftest.c -o conftest.s; then
1545 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1546 libc_cv_have_section_quotes=yes
1547 else
1548 libc_cv_have_section_quotes=no
1549 fi
1550 else
1551 libc_cv_have_section_quotes=unknown
1552 fi
1553 rm -f conftest.{c,s}
1554 ])
1555 if test $libc_cv_have_section_quotes = yes; then
1556 AC_DEFINE(HAVE_SECTION_QUOTES)
1557 fi
1559 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1560 [dnl
1561 cat > conftest.s <<EOF
1562 ${libc_cv_dot_text}
1563 .globl foo
1564 foo:
1565 .weak foo
1566 .weak bar; bar = foo
1567 EOF
1568 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1569 libc_cv_asm_weak_directive=yes
1570 else
1571 libc_cv_asm_weak_directive=no
1572 fi
1573 rm -f conftest*])
1575 if test $libc_cv_asm_weak_directive = no; then
1576 AC_CACHE_CHECK(for assembler .weakext directive,
1577 libc_cv_asm_weakext_directive,
1578 [dnl
1579 cat > conftest.s <<EOF
1580 ${libc_cv_dot_text}
1581 .globl foo
1582 foo:
1583 .weakext bar foo
1584 .weakext baz
1585 .globl baz
1586 baz:
1587 EOF
1588 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1589 libc_cv_asm_weakext_directive=yes
1590 else
1591 libc_cv_asm_weakext_directive=no
1592 fi
1593 rm -f conftest*])
1595 fi # no .weak
1597 if test $libc_cv_asm_weak_directive = yes; then
1598 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1599 elif test $libc_cv_asm_weakext_directive = yes; then
1600 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1601 fi
1603 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1604 cat > conftest.c <<\EOF
1605 _start () {}
1606 int __eh_pc;
1607 __throw () {}
1608 EOF
1609 dnl No \ in command here because it ends up inside ''.
1610 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1611 -nostdlib -nostartfiles -Wl,--no-whole-archive
1612 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1613 libc_cv_ld_no_whole_archive=yes
1614 else
1615 libc_cv_ld_no_whole_archive=no
1616 fi
1617 rm -f conftest*])
1618 if test $libc_cv_ld_no_whole_archive = no; then
1619 AC_MSG_ERROR([support for --no-whole-archive is needed])
1620 fi
1622 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1623 cat > conftest.c <<\EOF
1624 _start () {}
1625 int __eh_pc;
1626 __throw () {}
1627 EOF
1628 dnl No \ in command here because it ends up inside ''.
1629 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1630 -nostdlib -nostartfiles -fexceptions
1631 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1632 libc_cv_gcc_exceptions=yes
1633 else
1634 libc_cv_gcc_exceptions=no
1635 fi
1636 rm -f conftest*])
1637 if test $libc_cv_gcc_exceptions = yes; then
1638 exceptions=-fexceptions
1639 fi
1640 AC_SUBST(exceptions)dnl
1642 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1643 cat > conftest.c <<\EOF
1644 void zero (void *x)
1645 {
1646 __builtin_memset (x, 0, 1000);
1647 }
1648 EOF
1649 dnl
1650 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1651 then
1652 libc_cv_gcc_builtin_memset=no
1653 else
1654 libc_cv_gcc_builtin_memset=yes
1655 fi
1656 rm -f conftest* ])
1657 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1658 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1659 fi
1661 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1662 cat > conftest.c <<\EOF
1663 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1664 char *foo (const char *a, const char *b)
1665 {
1666 return __builtin_strstr (a, b);
1667 }
1668 EOF
1669 dnl
1670 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1671 then
1672 libc_cv_gcc_builtin_redirection=yes
1673 else
1674 libc_cv_gcc_builtin_redirection=no
1675 fi
1676 rm -f conftest* ])
1677 if test "$libc_cv_gcc_builtin_redirection" = no; then
1678 AC_MSG_ERROR([support for the symbol redirection needed])
1679 fi
1681 dnl Check whether the compiler supports the __thread keyword.
1682 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1683 [cat > conftest.c <<\EOF
1684 __thread int a = 42;
1685 EOF
1686 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1687 libc_cv_gcc___thread=yes
1688 else
1689 libc_cv_gcc___thread=no
1690 fi
1691 rm -f conftest*])
1692 if test "$libc_cv_gcc___thread" = no; then
1693 AC_MSG_ERROR([support for the __thread keyword is required])
1694 fi
1696 dnl Check whether the compiler supports the tls_model attribute.
1697 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1698 cat > conftest.c <<\EOF
1699 extern __thread int a __attribute__((tls_model ("initial-exec")));
1700 EOF
1701 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1702 libc_cv_gcc_tls_model_attr=yes
1703 else
1704 libc_cv_gcc_tls_model_attr=no
1705 fi
1706 rm -f conftest*])
1707 if test "$libc_cv_gcc_tls_model_attr" = no; then
1708 AC_MSG_ERROR([support for the tls_model attribute is required])
1709 fi
1711 dnl Determine how to disable generation of FMA instructions.
1712 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1713 libc_cv_cc_nofma, [dnl
1714 libc_cv_cc_nofma=
1715 for opt in -ffp-contract=off -mno-fused-madd; do
1716 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1717 done])
1718 AC_SUBST(libc_cv_cc_nofma)
1720 if test -n "$submachine"; then
1721 AC_CACHE_CHECK([for compiler option for CPU variant],
1722 libc_cv_cc_submachine, [dnl
1723 libc_cv_cc_submachine=no
1724 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1725 LIBC_TRY_CC_OPTION([$opt], [
1726 libc_cv_cc_submachine="$opt"
1727 break], [])
1728 done])
1729 if test "x$libc_cv_cc_submachine" = xno; then
1730 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1731 fi
1732 fi
1733 AC_SUBST(libc_cv_cc_submachine)
1735 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1736 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1737 cat > conftest.c <<EOF
1738 void
1739 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1740 foo (void) {}
1741 EOF
1742 libc_cv_cc_loop_to_function=no
1743 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1744 then
1745 libc_cv_cc_loop_to_function=yes
1746 fi
1747 rm -f conftest*])
1748 if test $libc_cv_cc_loop_to_function = yes; then
1749 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1750 fi
1751 AC_SUBST(libc_cv_cc_loop_to_function)
1753 dnl Check whether we have the gd library available.
1754 AC_MSG_CHECKING(for libgd)
1755 if test "$with_gd" != "no"; then
1756 old_CFLAGS="$CFLAGS"
1757 CFLAGS="$CFLAGS $libgd_include"
1758 old_LDFLAGS="$LDFLAGS"
1759 LDFLAGS="$LDFLAGS $libgd_ldflags"
1760 old_LIBS="$LIBS"
1761 LIBS="$LIBS -lgd -lpng -lz -lm"
1762 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1763 CFLAGS="$old_CFLAGS"
1764 LDFLAGS="$old_LDFLAGS"
1765 LIBS="$old_LIBS"
1766 else
1767 LIBGD=no
1768 fi
1769 AC_MSG_RESULT($LIBGD)
1770 AC_SUBST(LIBGD)
1772 # SELinux detection
1773 if test x$with_selinux = xno ; then
1774 have_selinux=no;
1775 else
1776 # See if we have the SELinux library
1777 AC_CHECK_LIB(selinux, is_selinux_enabled,
1778 have_selinux=yes, have_selinux=no)
1779 if test x$with_selinux = xyes ; then
1780 if test x$have_selinux = xno ; then
1781 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1782 fi
1783 fi
1784 fi
1785 # Check if we're building with SELinux support.
1786 if test "x$have_selinux" = xyes; then
1787 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1789 # See if we have the libaudit library
1790 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1791 have_libaudit=yes, have_libaudit=no)
1792 if test "x$have_libaudit" = xyes; then
1793 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1794 fi
1795 AC_SUBST(have_libaudit)
1797 # See if we have the libcap library
1798 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1799 if test "x$have_libcap" = xyes; then
1800 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1801 fi
1802 AC_SUBST(have_libcap)
1803 fi
1804 AC_SUBST(have_selinux)
1806 dnl check for the size of 'long double'.
1807 AC_CHECK_SIZEOF(long double, 0)
1808 sizeof_long_double=$ac_cv_sizeof_long_double
1809 AC_SUBST(sizeof_long_double)
1811 CPPUNDEFS=
1812 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1813 dnl Since we are building the implementations of the fortified functions here,
1814 dnl having the macro defined interacts very badly.
1815 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1816 [AC_TRY_COMPILE([], [
1817 #ifdef _FORTIFY_SOURCE
1818 # error bogon
1819 #endif],
1820 [libc_cv_predef_fortify_source=no],
1821 [libc_cv_predef_fortify_source=yes])])
1822 if test $libc_cv_predef_fortify_source = yes; then
1823 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1824 fi
1825 AC_SUBST(CPPUNDEFS)
1827 dnl Check for silly hacked compilers inserting -fstack-protector.
1828 dnl This breaks badly for the early startup code we compile, since
1829 dnl the compiled code can refer to a magic machine-dependent location
1830 dnl for the canary value before we have sufficient setup for that to
1831 dnl work. It's also questionable to build all of libc with this flag
1832 dnl even when you're doing that for most applications you build, since
1833 dnl libc's code is so heavily-used and performance-sensitive. If we
1834 dnl ever really want to make that work, it should be enabled explicitly
1835 dnl in the libc build, not inherited from implicit compiler settings.
1836 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1837 libc_cv_predef_stack_protector, [
1838 AC_TRY_COMPILE([extern void foobar (char *);],
1839 [char large_array[2048]; foobar (large_array);], [
1840 libc_undefs=`$NM -u conftest.o |
1841 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1842 2>&AS_MESSAGE_LOG_FD` || {
1843 AC_MSG_ERROR([confusing output from $NM -u])
1844 }
1845 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1846 # On some architectures, there are architecture-specific undefined
1847 # symbols (resolved by the linker), so filter out unknown symbols.
1848 # This will fail to produce the correct result if the compiler
1849 # defaults to -fstack-protector but this produces an undefined symbol
1850 # other than __stack_chk_fail. However, compilers like that have not
1851 # been encountered in practice.
1852 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1853 case "$libc_undefs" in
1854 foobar) libc_cv_predef_stack_protector=no ;;
1855 '__stack_chk_fail
1856 foobar') libc_cv_predef_stack_protector=yes ;;
1857 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1858 esac],
1859 [AC_MSG_ERROR([test compilation failed])])
1860 ])
1861 libc_extra_cflags=
1862 if test $libc_cv_predef_stack_protector = yes; then
1863 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1864 fi
1865 libc_extra_cppflags=
1867 # Some linkers on some architectures support __ehdr_start but with
1868 # bugs. Make sure usage of it does not create relocations in the
1869 # output (as the linker should resolve them all for us).
1870 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1871 libc_cv_ehdr_start, [
1872 old_CFLAGS="$CFLAGS"
1873 old_LDFLAGS="$LDFLAGS"
1874 old_LIBS="$LIBS"
1875 CFLAGS="$CFLAGS -fPIC"
1876 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1877 LIBS=
1878 AC_LINK_IFELSE([AC_LANG_SOURCE([
1879 typedef struct {
1880 char foo;
1881 long val;
1882 } Ehdr;
1883 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1884 long ehdr (void) { return __ehdr_start.val; }
1885 ])],
1886 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1887 libc_cv_ehdr_start=broken
1888 else
1889 libc_cv_ehdr_start=yes
1890 fi], [libc_cv_ehdr_start=no])
1891 CFLAGS="$old_CFLAGS"
1892 LDFLAGS="$old_LDFLAGS"
1893 LIBS="$old_LIBS"
1894 ])
1895 if test "$libc_cv_ehdr_start" = yes; then
1896 AC_DEFINE([HAVE_EHDR_START])
1897 elif test "$libc_cv_ehdr_start" = broken; then
1898 AC_MSG_WARN([linker is broken -- you should upgrade])
1899 fi
1901 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1902 libc_cv_builtin_trap, [dnl
1903 libc_cv_builtin_trap=no
1904 AC_TRY_COMPILE([], [__builtin_trap ()], [
1905 libc_undefs=`$NM -u conftest.o |
1906 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1907 2>&AS_MESSAGE_LOG_FD` || {
1908 AC_MSG_ERROR([confusing output from $NM -u])
1909 }
1910 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1911 if test -z "$libc_undefs"; then
1912 libc_cv_builtin_trap=yes
1913 fi])])
1914 if test $libc_cv_builtin_trap = yes; then
1915 AC_DEFINE([HAVE_BUILTIN_TRAP])
1916 fi
1918 ### End of automated tests.
1919 ### Now run sysdeps configure fragments.
1921 # They also can set these variables.
1922 use_ldconfig=no
1923 ldd_rewrite_script=no
1924 libc_cv_sysconfdir=$sysconfdir
1925 libc_cv_localstatedir=$localstatedir
1926 libc_cv_gcc_unwind_find_fde=no
1927 libc_cv_idn=no
1929 # Iterate over all the sysdep directories we will use, running their
1930 # configure fragments.
1931 for dir in $sysnames; do
1932 case $dir in
1933 /*) dest=$dir ;;
1934 *) dest=$srcdir/$dir ;;
1935 esac
1936 if test -r $dest/configure; then
1937 AC_MSG_RESULT(running configure fragment for $dir)
1938 . $dest/configure
1939 fi
1940 done
1942 AC_SUBST(libc_extra_cflags)
1943 AC_SUBST(libc_extra_cppflags)
1945 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1946 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1947 fi
1948 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1950 # A sysdeps configure fragment can reset this if IFUNC is not actually
1951 # usable even though the assembler knows how to generate the symbol type.
1952 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1953 AC_DEFINE(HAVE_IFUNC)
1954 fi
1956 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1957 # configure fragment can override the value to prevent this AC_DEFINE.
1958 AC_SUBST(use_nscd)
1959 if test "x$use_nscd" != xno; then
1960 AC_DEFINE([USE_NSCD])
1961 fi
1962 if test "x$build_nscd" = xdefault; then
1963 build_nscd=$use_nscd
1964 fi
1966 # Test for old glibc 2.0.x headers so that they can be removed properly
1967 # Search only in includedir.
1968 AC_MSG_CHECKING(for old glibc 2.0.x headers)
1969 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
1970 then
1971 old_glibc_headers=yes
1972 else
1973 old_glibc_headers=no
1974 fi
1975 AC_MSG_RESULT($old_glibc_headers)
1976 if test ${old_glibc_headers} = yes; then
1977 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
1978 AC_MSG_WARN(*** be removed.)
1979 fi
1980 AC_SUBST(old_glibc_headers)
1982 AC_SUBST(libc_cv_slibdir)
1983 AC_SUBST(libc_cv_rtlddir)
1984 AC_SUBST(libc_cv_localedir)
1985 AC_SUBST(libc_cv_sysconfdir)
1986 AC_SUBST(libc_cv_localstatedir)
1987 AC_SUBST(libc_cv_rootsbindir)
1988 AC_SUBST(libc_cv_forced_unwind)
1990 if test x$use_ldconfig = xyes; then
1991 AC_DEFINE(USE_LDCONFIG)
1992 fi
1993 AC_SUBST(use_ldconfig)
1994 AC_SUBST(ldd_rewrite_script)
1996 AC_SUBST(static)
1997 AC_SUBST(shared)
1999 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2000 [libc_cv_pic_default=yes
2001 cat > conftest.c <<EOF
2002 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2003 # error PIC is default.
2004 #endif
2005 EOF
2006 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2007 libc_cv_pic_default=no
2008 fi
2009 rm -f conftest.*])
2010 AC_SUBST(libc_cv_pic_default)
2012 AC_SUBST(profile)
2013 AC_SUBST(static_nss)
2015 AC_SUBST(DEFINES)
2017 dnl See sysdeps/mach/configure.ac for this variable.
2018 AC_SUBST(mach_interface_list)
2020 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2021 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2022 AC_SUBST(VERSION)
2023 AC_SUBST(RELEASE)
2025 AC_CONFIG_FILES([config.make Makefile])
2026 AC_CONFIG_COMMANDS([default],[[
2027 case $CONFIG_FILES in *config.make*)
2028 echo "$config_vars" >> config.make;;
2029 esac
2030 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2031 AC_OUTPUT