| blob | 384bf3f15238c45862a84088379093125432f4ec |
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 AC_CHECK_TOOL(READELF, readelf, false)
55 # We need the C++ compiler only for testing.
56 AC_PROG_CXX
57 # It's useless to us if it can't link programs (e.g. missing -lstdc++).
58 AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
59 AC_LANG_PUSH([C++])
60 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
61 [libc_cv_cxx_link_ok=yes],
62 [libc_cv_cxx_link_ok=no])
63 AC_LANG_POP([C++])])
64 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
66 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
67 AC_MSG_ERROR([you must configure in a separate build directory])
68 fi
70 # This will get text that should go into config.make.
71 config_vars=
73 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
74 AC_ARG_WITH([gd],
75 AC_HELP_STRING([--with-gd=DIR],
76 [find libgd include dir and library with prefix DIR]),
77 [dnl
78 case "$with_gd" in
79 yes|''|no) ;;
80 *) libgd_include="-I$withval/include"
81 libgd_ldflags="-L$withval/lib" ;;
82 esac
83 ])
84 AC_ARG_WITH([gd-include],
85 AC_HELP_STRING([--with-gd-include=DIR],
86 [find libgd include files in DIR]),
87 [dnl
88 case "$with_gd_include" in
89 ''|no) ;;
90 *) libgd_include="-I$withval" ;;
91 esac
92 ])
93 AC_ARG_WITH([gd-lib],
94 AC_HELP_STRING([--with-gd-lib=DIR],
95 [find libgd library files in DIR]),
96 [dnl
97 case "$with_gd_lib" in
98 ''|no) ;;
99 *) libgd_ldflags="-L$withval" ;;
100 esac
101 ])
103 if test -n "$libgd_include"; then
104 config_vars="$config_vars
105 CFLAGS-memusagestat.c = $libgd_include"
106 fi
107 if test -n "$libgd_ldflags"; then
108 config_vars="$config_vars
109 libgd-LDFLAGS = $libgd_ldflags"
110 fi
112 dnl Arguments to specify presence of other packages/features.
113 AC_ARG_WITH([fp],
114 AC_HELP_STRING([--with-fp],
115 [if using floating-point hardware @<:@default=yes@:>@]),
116 [with_fp=$withval],
117 [with_fp=yes])
118 AC_SUBST(with_fp)
119 AC_ARG_WITH([binutils],
120 AC_HELP_STRING([--with-binutils=PATH],
121 [specify location of binutils (as and ld)]),
122 [path_binutils=$withval],
123 [path_binutils=''])
124 AC_ARG_WITH([selinux],
125 AC_HELP_STRING([--with-selinux],
126 [if building with SELinux support]),
127 [with_selinux=$withval],
128 [with_selinux=auto])
130 AC_ARG_WITH([headers],
131 AC_HELP_STRING([--with-headers=PATH],
132 [location of system headers to use
133 (for example /usr/src/linux/include)
134 @<:@default=compiler default@:>@]),
135 [sysheaders=$withval],
136 [sysheaders=''])
137 AC_SUBST(sysheaders)
139 AC_SUBST(use_default_link)
140 AC_ARG_WITH([default-link],
141 AC_HELP_STRING([--with-default-link],
142 [do not use explicit linker scripts]),
143 [use_default_link=$withval],
144 [use_default_link=default])
146 AC_ARG_ENABLE([sanity-checks],
147 AC_HELP_STRING([--disable-sanity-checks],
148 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
149 [enable_sanity=$enableval],
150 [enable_sanity=yes])
152 AC_ARG_ENABLE([shared],
153 AC_HELP_STRING([--enable-shared],
154 [build shared library @<:@default=yes if GNU ld@:>@]),
155 [shared=$enableval],
156 [shared=yes])
157 AC_ARG_ENABLE([profile],
158 AC_HELP_STRING([--enable-profile],
159 [build profiled library @<:@default=no@:>@]),
160 [profile=$enableval],
161 [profile=no])
162 AC_ARG_ENABLE([timezone-tools],
163 AC_HELP_STRING([--disable-timezone-tools],
164 [do not install timezone tools (if using external ones) @<:@default=install@:>@]),
165 [enable_timezone_tools=$enableval],
166 [enable_timezone_tools=yes])
167 AC_SUBST(enable_timezone_tools)
169 AC_ARG_ENABLE([hardcoded-path-in-tests],
170 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
171 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
172 [hardcoded_path_in_tests=$enableval],
173 [hardcoded_path_in_tests=no])
174 AC_SUBST(hardcoded_path_in_tests)
176 AC_ARG_ENABLE([stackguard-randomization],
177 AC_HELP_STRING([--enable-stackguard-randomization],
178 [initialize __stack_chk_guard canary with a random number at program start]),
179 [enable_stackguard_randomize=$enableval],
180 [enable_stackguard_randomize=no])
181 if test "$enable_stackguard_randomize" = yes; then
182 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
183 fi
185 AC_ARG_ENABLE([lock-elision],
186 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
187 [Enable lock elision for pthread mutexes by default]),
188 [enable_lock_elision=$enableval],
189 [enable_lock_elision=no])
190 AC_SUBST(enable_lock_elision)
191 if test "$enable_lock_elision" = yes ; then
192 AC_DEFINE(ENABLE_LOCK_ELISION)
193 fi
195 dnl Generic infrastructure for drop-in additions to libc.
196 AC_ARG_ENABLE([add-ons],
197 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
198 [configure and build add-ons in DIR1,DIR2,...
199 search for add-ons if no parameter given]),
200 , [enable_add_ons=yes])
202 AC_ARG_ENABLE([hidden-plt],
203 AC_HELP_STRING([--disable-hidden-plt],
204 [do not hide internal function calls to avoid PLT]),
205 [hidden=$enableval],
206 [hidden=yes])
207 if test "x$hidden" = xno; then
208 AC_DEFINE(NO_HIDDEN)
209 fi
211 AC_ARG_ENABLE([bind-now],
212 AC_HELP_STRING([--enable-bind-now],
213 [disable lazy relocations in DSOs]),
214 [bindnow=$enableval],
215 [bindnow=no])
216 AC_SUBST(bindnow)
218 dnl On some platforms we cannot use dynamic loading. We must provide
219 dnl static NSS modules.
220 AC_ARG_ENABLE([static-nss],
221 AC_HELP_STRING([--enable-static-nss],
222 [build static NSS modules @<:@default=no@:>@]),
223 [static_nss=$enableval],
224 [static_nss=no])
225 dnl Enable static NSS also if we build no shared objects.
226 if test x"$static_nss" = xyes || test x"$shared" = xno; then
227 static_nss=yes
228 AC_DEFINE(DO_STATIC_NSS)
229 fi
231 AC_ARG_ENABLE([force-install],
232 AC_HELP_STRING([--disable-force-install],
233 [don't force installation of files from this package, even if they are older than the installed files]),
234 [force_install=$enableval],
235 [force_install=yes])
236 AC_SUBST(force_install)
238 AC_ARG_ENABLE([maintainer-mode],
239 AC_HELP_STRING([--enable-maintainer-mode],
240 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
241 [maintainer=$enableval],
242 [maintainer=no])
244 dnl On some platforms we allow dropping compatibility with all kernel
245 dnl versions.
246 AC_ARG_ENABLE([kernel],
247 AC_HELP_STRING([--enable-kernel=VERSION],
248 [compile for compatibility with kernel not older than VERSION]),
249 [minimum_kernel=$enableval],
250 [])
251 dnl Prevent unreasonable values.
252 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
253 # Better nothing than this.
254 minimum_kernel=""
255 else
256 if test "$minimum_kernel" = current; then
257 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
258 fi
259 fi
261 dnl For the development we sometimes want gcc to issue even more warnings.
262 dnl This is not the default since many of the extra warnings are not
263 dnl appropriate.
264 AC_ARG_ENABLE([all-warnings],
265 AC_HELP_STRING([--enable-all-warnings],
266 [enable all useful warnings gcc can issue]),
267 [all_warnings=$enableval],
268 [])
269 AC_SUBST(all_warnings)
271 AC_ARG_ENABLE([werror],
272 AC_HELP_STRING([--disable-werror],
273 [do not build with -Werror]),
274 [enable_werror=$enableval],
275 [enable_werror=yes])
276 AC_SUBST(enable_werror)
278 AC_ARG_ENABLE([multi-arch],
279 AC_HELP_STRING([--enable-multi-arch],
280 [enable single DSO with optimizations for multiple architectures]),
281 [multi_arch=$enableval],
282 [multi_arch=default])
284 AC_ARG_ENABLE([nss-crypt],
285 AC_HELP_STRING([--enable-nss-crypt],
286 [enable libcrypt to use nss]),
287 [nss_crypt=$enableval],
288 [nss_crypt=no])
289 if test x$nss_crypt = xyes; then
290 nss_includes=-I$(nss-config --includedir 2>/dev/null)
291 if test $? -ne 0; then
292 AC_MSG_ERROR([cannot find include directory with nss-config])
293 fi
294 old_CFLAGS="$CFLAGS"
295 CFLAGS="$CFLAGS $nss_includes"
296 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
297 #include <hasht.h>
298 #include <nsslowhash.h>
299 void f (void) { NSSLOW_Init (); }])],
300 libc_cv_nss_crypt=yes,
301 AC_MSG_ERROR([
302 cannot find NSS headers with lowlevel hash function interfaces]))
303 old_LIBS="$LIBS"
304 LIBS="$LIBS -lfreebl3"
305 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
306 #include <hasht.h>
307 #include <nsslowhash.h>],
308 [NSSLOW_Init();])],
309 libc_cv_nss_crypt=yes,
310 AC_MSG_ERROR([
311 cannot link program using lowlevel NSS hash functions]))
312 CFLAGS="$old_CFLAGS"
313 LIBS="$old_LIBS"
314 else
315 libc_cv_nss_crypt=no
316 fi
317 AC_SUBST(libc_cv_nss_crypt)
320 AC_ARG_ENABLE([obsolete-rpc],
321 AC_HELP_STRING([--enable-obsolete-rpc],
322 [build and install the obsolete RPC code for link-time usage]),
323 [link_obsolete_rpc=$enableval],
324 [link_obsolete_rpc=no])
325 AC_SUBST(link_obsolete_rpc)
327 if test "$link_obsolete_rpc" = yes; then
328 AC_DEFINE(LINK_OBSOLETE_RPC)
329 fi
331 AC_ARG_ENABLE([systemtap],
332 [AS_HELP_STRING([--enable-systemtap],
333 [enable systemtap static probe points @<:@default=no@:>@])],
334 [systemtap=$enableval],
335 [systemtap=no])
336 if test "x$systemtap" != xno; then
337 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
338 old_CFLAGS="$CFLAGS"
339 CFLAGS="-std=gnu99 $CFLAGS"
340 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
341 void foo (int i, void *p)
342 {
343 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
344 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
345 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
346 CFLAGS="$old_CFLAGS"])
347 if test $libc_cv_sdt = yes; then
348 AC_DEFINE([USE_STAP_PROBE])
349 elif test "x$systemtap" != xauto; then
350 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
351 fi
352 fi
354 AC_ARG_ENABLE([build-nscd],
355 [AS_HELP_STRING([--disable-build-nscd],
356 [disable building and installing the nscd daemon])],
357 [build_nscd=$enableval],
358 [build_nscd=default])
359 AC_SUBST(build_nscd)
361 # Note the use of $use_nscd is near the bottom of the file.
362 AC_ARG_ENABLE([nscd],
363 [AS_HELP_STRING([--disable-nscd],
364 [library functions will not contact the nscd daemon])],
365 [use_nscd=$enableval],
366 [use_nscd=yes])
368 AC_ARG_ENABLE([pt_chown],
369 [AS_HELP_STRING([--enable-pt_chown],
370 [Enable building and installing pt_chown])],
371 [build_pt_chown=$enableval],
372 [build_pt_chown=no])
373 AC_SUBST(build_pt_chown)
374 if test "$build_pt_chown" = yes; then
375 AC_DEFINE(HAVE_PT_CHOWN)
376 fi
378 # The abi-tags file uses a fairly simplistic model for name recognition that
379 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
380 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
381 # This doesn't get used much beyond that, so it's fairly safe.
382 case "$host_os" in
383 linux*)
384 ;;
385 gnu*)
386 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
387 ;;
388 esac
390 AC_ARG_ENABLE([mathvec],
391 [AS_HELP_STRING([--enable-mathvec],
392 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
393 [build_mathvec=$enableval],
394 [build_mathvec=notset])
396 # We keep the original values in `$config_*' and never modify them, so we
397 # can write them unchanged into config.make. Everything else uses
398 # $machine, $vendor, and $os, and changes them whenever convenient.
399 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
401 # Don't allow vendor == "unknown"
402 test "$config_vendor" = unknown && config_vendor=
403 config_os="`echo $config_os | sed 's/^unknown-//'`"
405 # Some configurations imply other options.
406 elf=yes
408 # The configure fragment of an add-on port can modify these to supplement
409 # or override the table in the case statement below. No fragment should
410 # ever change the config_* variables, however.
411 machine=$config_machine
412 vendor=$config_vendor
413 os=$config_os
414 base_os=''
416 submachine=
417 AC_ARG_WITH([cpu],
418 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
419 [dnl
420 case "$withval" in
421 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
422 no) ;;
423 *) submachine="$withval" ;;
424 esac
425 ])
427 # An preconfigure script can set this when it wants to disable the sanity
428 # check below.
429 libc_config_ok=no
431 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
432 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
434 dnl Having this here, though empty, makes sure that if add-ons' fragments
435 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
436 dnl our AC_OUTPUT will actually use it.
437 AC_CONFIG_SUBDIRS()
439 case "$enable_add_ons" in
440 ''|no) add_ons= ;;
441 yes|'*')
442 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
443 sed 's@/[[^/]]*$@@' | sort | uniq`
444 add_ons_automatic=yes
445 ;;
446 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
447 add_ons_automatic=no ;;
448 esac
450 configured_add_ons=
451 add_ons_sfx=
452 add_ons_pfx=
453 if test x"$add_ons" != x; then
454 for f in $add_ons; do
455 # Some sanity checks
456 case "$f" in
457 crypt)
458 AC_MSG_ERROR([
459 *** It seems that you're using an old \`crypt' add-on. crypt is now
460 *** part of glibc and using the old add-on will not work with this
461 *** release. Start again with fresh sources and without the old
462 *** \`crypt' add-on.])
463 ;;
464 localedata)
465 AC_MSG_ERROR([
466 *** It seems that you're using an old \`localedata' add-on. localedata
467 *** is now part of glibc and using the old add-on will not work with
468 *** this release. Start again with fresh sources and without the old
469 *** \`localedata' add-on.])
470 ;;
471 esac
472 done
474 # Now source each add-on's configure fragment.
475 # The fragments can use $srcdir/$libc_add_on to find themselves,
476 # and test $add_ons_automatic to see if they were explicitly requested.
477 # A fragment can clear (or even change) $libc_add_on to affect
478 # whether it goes into the list to be actually used in the build.
479 use_add_ons=
480 for libc_add_on in $add_ons; do
481 # Test whether such a directory really exists.
482 # It can be absolute, or relative to $srcdir, or relative to the build dir.
483 case "$libc_add_on" in
484 /*)
485 libc_add_on_srcdir=$libc_add_on
486 ;;
487 *)
488 test -d "$srcdir/$libc_add_on" || {
489 if test -d "$libc_add_on"; then
490 libc_add_on="`pwd`/$libc_add_on"
491 else
492 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
493 fi
494 }
495 libc_add_on_srcdir=$srcdir/$libc_add_on
496 ;;
497 esac
499 libc_add_on_frag=$libc_add_on_srcdir/configure
500 libc_add_on_canonical=
501 libc_add_on_config_subdirs=
502 if test -r "$libc_add_on_frag"; then
503 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
504 libc_add_on_canonical=unknown
505 libc_add_on_subdirs=
506 . "$libc_add_on_frag"
507 test -z "$libc_add_on" || {
508 configured_add_ons="$configured_add_ons $libc_add_on"
509 if test "x$libc_add_on_canonical" = xunknown; then
510 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
511 fi
512 for d in $libc_add_on_subdirs; do
513 case "$libc_add_on" in
514 /*) subdir_srcdir="$libc_add_on" ;;
515 *) subdir_srcdir="\$(..)$libc_add_on" ;;
516 esac
517 case "$d" in
518 .)
519 d="${libc_add_on_canonical:-$libc_add_on}"
520 ;;
521 /*)
522 subdir_srcdir="$d"
523 ;;
524 *)
525 subdir_srcdir="$subdir_srcdir/$d"
526 ;;
527 esac
528 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
529 add_on_subdirs="$add_on_subdirs $d"
530 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
531 $d-srcdir = $subdir_srcdir"
532 done
533 for d in $libc_add_on_config_subdirs; do
534 case "$d" in
535 /*) AC_MSG_ERROR(dnl
536 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
537 esac
538 if test ! -d "$libc_add_on_srcdir/$d"; then
539 AC_MSG_ERROR(fragment wants to configure missing directory $d)
540 fi
541 case "$libc_add_on" in
542 /*) AC_MSG_ERROR(dnl
543 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
544 esac
545 subdirs="$subdirs $libc_add_on/$d"
546 done
547 }
548 fi
549 if test -n "$libc_add_on"; then
550 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
551 use_add_ons="$use_add_ons $libc_add_on"
552 add_ons_pfx="$add_ons_pfx $libc_add_on/"
553 test -z "$libc_add_on_canonical" ||
554 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
555 fi
556 done
557 # Use echo to strip excess whitespace.
558 add_ons="`echo $use_add_ons`"
559 fi
560 AC_SUBST(add_ons)
561 AC_SUBST(add_on_subdirs)
564 ###
565 ### I put this here to prevent those annoying emails from people who cannot
566 ### read and try to compile glibc on unsupported platforms. --drepper
567 ###
568 ### By using the undocumented --enable-hacker-mode option for configure
569 ### one can skip this test to make the configuration not fail for unsupported
570 ### platforms.
571 ###
572 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
573 case "$machine-$host_os" in
574 *-linux* | *-gnu*)
575 ;;
576 *)
577 echo "*** The GNU C library is currently not available for this platform."
578 echo "*** So far nobody cared to port it and if there is no volunteer it"
579 echo "*** might never happen. So, if you have interest to see glibc on"
580 echo "*** this platform visit"
581 echo "*** http://www.gnu.org/software/libc/porting.html"
582 echo "*** and join the group of porters"
583 exit 1
584 ;;
585 esac
586 fi
588 # Set base_machine if not set by a preconfigure fragment.
589 test -n "$base_machine" || base_machine=$machine
590 AC_SUBST(base_machine)
592 # For the multi-arch option we need support in the assembler & linker.
593 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
594 libc_cv_ld_gnu_indirect_function, [dnl
595 cat > conftest.S <<EOF
596 .type foo,%gnu_indirect_function
597 foo:
598 .globl _start
599 _start:
600 .globl __start
601 __start:
602 .data
603 #ifdef _LP64
604 .quad foo
605 #else
606 .long foo
607 #endif
608 EOF
609 libc_cv_ld_gnu_indirect_function=no
610 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
611 -nostartfiles -nostdlib \
612 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
613 # Do a link to see if the backend supports IFUNC relocs.
614 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
615 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
616 libc_cv_ld_gnu_indirect_function=yes
617 }
618 fi
619 rm -f conftest*])
621 AC_MSG_CHECKING(whether .text pseudo-op must be used)
622 AC_CACHE_VAL(libc_cv_dot_text, [dnl
623 cat > conftest.s <<EOF
624 .text
625 EOF
626 libc_cv_dot_text=
627 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
628 libc_cv_dot_text=.text
629 fi
630 rm -f conftest*])
631 if test -z "$libc_cv_dot_text"; then
632 AC_MSG_RESULT(no)
633 else
634 AC_MSG_RESULT(yes)
635 fi
637 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
638 if test x"$multi_arch" = xyes; then
639 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
640 else
641 multi_arch=no
642 fi
643 fi
644 multi_arch_d=
645 if test x"$multi_arch" != xno; then
646 multi_arch_d=/multiarch
647 fi
649 # Compute the list of sysdep directories for this configuration.
650 # This can take a while to compute.
651 sysdep_dir=$srcdir/sysdeps
652 AC_MSG_CHECKING(sysdep dirs)
653 dnl We need to use [ and ] for other purposes for a while now.
654 changequote(,)dnl
655 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
656 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
658 test "x$base_os" != x || case "$os" in
659 gnu*)
660 base_os=mach/hurd ;;
661 linux*)
662 base_os=unix/sysv ;;
663 esac
665 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
666 tail=$os
667 ostry=$os
668 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
669 ostry="$ostry /$o"
670 tail=$o
671 done
672 o=`echo $tail | sed 's/[0-9]*$//'`
673 if test $o != $tail; then
674 ostry="$ostry /$o"
675 fi
676 # For linux-gnu, try linux-gnu, then linux.
677 o=`echo $tail | sed 's/-.*$//'`
678 if test $o != $tail; then
679 ostry="$ostry /$o"
680 fi
682 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
683 base=
684 tail=$base_os
685 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
686 set $b
687 base="$base /$1"
688 tail="$2"
689 done
691 # For sparc/sparc32, try sparc/sparc32 and then sparc.
692 mach=
693 tail=$machine${submachine:+/$submachine}
694 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
695 set $m
696 # Prepend the machine's FPU directory unless --without-fp.
697 if test "$with_fp" = yes; then
698 maybe_fpu=/fpu
699 else
700 maybe_fpu=/nofpu
701 fi
702 # For each machine term, try it with and then without /multiarch.
703 for try_fpu in $maybe_fpu ''; do
704 for try_multi in $multi_arch_d ''; do
705 mach="$mach /$1$try_fpu$try_multi"
706 done
707 done
708 tail="$2"
709 done
711 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
712 changequote([,])dnl
714 # Find what sysdep directories exist.
715 sysnames_add_ons=
716 sysnames=
717 for b in $base ''; do
718 for m0 in $mach ''; do
719 for v in /$vendor ''; do
720 test "$v" = / && continue
721 for o in /$ostry ''; do
722 test "$o" = / && continue
723 for m in $mach ''; do
724 for d in $add_ons_pfx ''; do
725 for a in $add_ons_sfx ''; do
726 try_suffix="$m0$b$v$o$m"
727 if test -n "$try_suffix"; then
728 try_srcdir="${srcdir}/"
729 case "$d" in
730 /*) try_srcdir= ;;
731 esac
732 try="${d}sysdeps$try_suffix$a"
733 test -n "$enable_debug_configure" &&
734 echo "$0 [DEBUG]: try $try" >&2
735 if test -d "$try_srcdir$try"; then
736 sysnames="$sysnames $try"
737 { test -n "$o" || test -n "$b"; } && os_used=t
738 { test -n "$m" || test -n "$m0"; } && machine_used=t
739 case x${m0:-$m} in
740 x*/$submachine) submachine_used=t ;;
741 esac
742 if test -n "$d"; then
743 case "$sysnames_add_ons" in
744 *" $d "*) ;;
745 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
746 esac
747 fi
748 fi
749 fi
750 done
751 done
752 done
753 done
754 done
755 done
756 done
758 # If the assembler supports gnu_indirect_function symbol type and the
759 # architecture supports multi-arch, we enable multi-arch by default.
760 case $sysnames_add_ons$sysnames in
761 *"$multi_arch_d"*)
762 ;;
763 *)
764 test x"$multi_arch" = xdefault && multi_arch=no
765 ;;
766 esac
767 if test x"$multi_arch" != xno; then
768 AC_DEFINE(USE_MULTIARCH)
769 fi
770 AC_SUBST(multi_arch)
772 if test -z "$os_used" && test "$os" != none; then
773 AC_MSG_ERROR(Operating system $os is not supported.)
774 fi
775 if test -z "$machine_used" && test "$machine" != none; then
776 AC_MSG_ERROR(The $machine is not supported.)
777 fi
778 if test -z "$submachine_used" && test -n "$submachine"; then
779 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
780 fi
781 AC_SUBST(submachine)
783 # We have now validated the configuration.
785 # Expand the list of system names into a full list of directories
786 # from each element's parent name and Implies file (if present).
787 set $sysnames
788 names=
789 while test $# -gt 0; do
790 name=$1
791 shift
793 case " $names " in *" $name "*)
794 # Already in the list.
795 continue
796 esac
798 # Report each name as we discover it, so there is no long pause in output.
799 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
801 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
803 case $name in
804 /*) xsrcdir= ;;
805 *) xsrcdir=$srcdir/ ;;
806 esac
807 test -n "$enable_debug_configure" &&
808 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
810 for implies_file in Implies Implies-before Implies-after; do
811 implies_type=`echo $implies_file | sed s/-/_/`
812 eval ${implies_type}=
813 if test -f $xsrcdir$name/$implies_file; then
814 # Collect more names from the `Implies' file (removing comments).
815 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
816 for x in $implied_candidate; do
817 found=no
818 if test -d $xsrcdir$name_base/$x; then
819 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
820 found=yes
821 fi
822 for d in $add_ons_pfx ''; do
823 try="${d}sysdeps/$x"
824 case $d in
825 /*) try_srcdir= ;;
826 *) try_srcdir=$srcdir/ ;;
827 esac
828 test -n "$enable_debug_configure" &&
829 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
830 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
831 then
832 eval "${implies_type}=\"\$${implies_type} \$try\""
833 found=yes
834 case "$sysnames_add_ons" in
835 *" $d "*) ;;
836 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
837 esac
838 fi
839 done
840 if test $found = no; then
841 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
842 fi
843 done
844 fi
845 done
847 # Add NAME to the list of names.
848 names="$names $name"
850 # Find the parent of NAME, using the empty string if it has none.
851 changequote(,)dnl
852 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
853 changequote([,])dnl
855 test -n "$enable_debug_configure" &&
856 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
857 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
859 # Add the names implied by NAME, and NAME's parent (if it has one), to
860 # the list of names to be processed (the argument list). We prepend the
861 # implied names to the list and append the parent. We want implied
862 # directories to come before further directories inferred from the
863 # configuration components; this ensures that for sysv4, unix/common
864 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
865 # after sysv4).
866 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
867 test -n "$sysnames" && set $sysnames
868 done
870 # Add the default directories.
871 default_sysnames="sysdeps/generic"
872 sysnames="$names $default_sysnames"
873 AC_SUBST(sysnames)
874 # The other names were emitted during the scan.
875 AC_MSG_RESULT($default_sysnames)
877 # Collect the list of add-ons that supply partial sysdeps trees.
878 sysdeps_add_ons=
879 for add_on in $add_ons; do
880 case "$add_on" in
881 /*) xsrcdir= ;;
882 *) xsrcdir="$srcdir/" ;;
883 esac
885 test -d "$xsrcdir$add_on/sysdeps" || {
886 case "$configured_add_ons " in
887 *" $add_on "*) ;;
888 *|'')
889 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
890 ;;
891 esac
892 continue
893 }
895 sysdeps_add_ons="$sysdeps_add_ons $add_on"
896 case "$sysnames_add_ons" in
897 *" $add_on/ "*) ;;
898 *|'')
899 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
900 continue ;;
901 esac
903 found=no
904 for d in $sysnames; do
905 case "$d" in
906 $add_on/sysdeps/*) ;;
907 *) continue ;;
908 esac
909 (cd "$xsrcdir$d" && for f in *[[!~]]; do
910 case "$f" in
911 sys|bits)
912 for ff in $f/*.h; do
913 test -d "$ff" || { test -e "$ff" && exit 88; }
914 done
915 ;;
916 *)
917 test -d "$f" || { test -e "$f" && exit 88; }
918 ;;
919 esac
920 done)
921 if test $? -eq 88; then
922 found=yes
923 break
924 fi
925 done
926 if test $found = no; then
927 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
928 fi
929 done
930 AC_SUBST(sysdeps_add_ons)
933 ### Locate tools.
935 AC_PROG_INSTALL
936 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
937 # The makefiles need to use a different form to find it in $srcdir.
938 INSTALL='\$(..)./scripts/install-sh -c'
939 fi
940 AC_PROG_LN_S
942 LIBC_PROG_BINUTILS
944 # Accept binutils 2.22 or newer.
945 AC_CHECK_PROG_VER(AS, $AS, --version,
946 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
947 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
948 AS=: critic_missing="$critic_missing as")
949 AC_CHECK_PROG_VER(LD, $LD, --version,
950 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
951 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
952 LD=: critic_missing="$critic_missing ld")
954 # These programs are version sensitive.
955 AC_CHECK_TOOL_PREFIX
956 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
957 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
958 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
960 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
961 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
962 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
963 MSGFMT=: aux_missing="$aux_missing msgfmt")
964 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
965 [GNU texinfo.* \([0-9][0-9.]*\)],
966 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
967 MAKEINFO=: aux_missing="$aux_missing makeinfo")
968 AC_CHECK_PROG_VER(SED, sed, --version,
969 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
970 [3.0[2-9]*|3.[1-9]*|[4-9]*],
971 SED=: aux_missing="$aux_missing sed")
972 AC_CHECK_PROG_VER(AWK, gawk, --version,
973 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
974 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
976 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
977 AC_TRY_COMPILE([], [
978 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
979 #error insufficient compiler
980 #endif],
981 [libc_cv_compiler_ok=yes],
982 [libc_cv_compiler_ok=no])])
983 AS_IF([test $libc_cv_compiler_ok != yes],
984 [critic_missing="$critic_missing compiler"])
986 AC_CHECK_TOOL(NM, nm, false)
988 if test "x$maintainer" = "xyes"; then
989 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
990 case "x$AUTOCONF" in
991 xno|x|x:) AUTOCONF=no ;;
992 *)
993 AC_CACHE_CHECK(dnl
994 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
995 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
996 libc_cv_autoconf_works=yes
997 else
998 libc_cv_autoconf_works=no
999 fi])
1000 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1001 ;;
1002 esac
1003 if test "x$AUTOCONF" = xno; then
1004 aux_missing="$aux_missing autoconf"
1005 fi
1006 else
1007 AUTOCONF=no
1008 fi
1010 test -n "$critic_missing" && AC_MSG_ERROR([
1011 *** These critical programs are missing or too old:$critic_missing
1012 *** Check the INSTALL file for required versions.])
1014 test -n "$aux_missing" && AC_MSG_WARN([
1015 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1016 *** some features will be disabled.
1017 *** Check the INSTALL file for required versions.])
1019 # if using special system headers, find out the compiler's sekrit
1020 # header directory and add that to the list. NOTE: Only does the right
1021 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1022 if test -n "$sysheaders"; then
1023 SYSINCLUDES=-nostdinc
1024 for d in include include-fixed; do
1025 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1026 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1027 done
1028 SYSINCLUDES="$SYSINCLUDES \
1029 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1030 if test -n "$CXX"; then
1031 CXX_SYSINCLUDES=
1032 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1033 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1034 test "x$cxxheaders" != x &&
1035 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1036 done
1037 fi
1038 fi
1039 AC_SUBST(SYSINCLUDES)
1040 AC_SUBST(CXX_SYSINCLUDES)
1042 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1043 # since this would lead to problems installing/building glibc.
1044 # LD_LIBRARY_PATH contains the current directory if one of the following
1045 # is true:
1046 # - one of the terminals (":" and ";") is the first or last sign
1047 # - two terminals occur directly after each other
1048 # - the path contains an element with a dot in it
1049 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1050 changequote(,)dnl
1051 case ${LD_LIBRARY_PATH} in
1052 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1053 ld_library_path_setting="contains current directory"
1054 ;;
1055 *)
1056 ld_library_path_setting="ok"
1057 ;;
1058 esac
1059 changequote([,])dnl
1060 AC_MSG_RESULT($ld_library_path_setting)
1061 if test "$ld_library_path_setting" != "ok"; then
1062 AC_MSG_ERROR([
1063 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1064 *** building glibc. Please change the environment variable
1065 *** and run configure again.])
1066 fi
1068 AC_PATH_PROG(BASH_SHELL, bash, no)
1070 AC_PATH_PROG(PERL, perl, no)
1071 if test "$PERL" != no &&
1072 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1073 PERL=no
1074 fi
1075 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1076 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1077 AC_CHECK_PROG_VER(BISON, bison, --version,
1078 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1079 [2.7*|[3-9].*|[1-9][0-9]*],
1080 BISON=no)
1082 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1083 libc_cv_need_minus_P, [dnl
1084 cat > conftest.S <<EOF
1085 #include "confdefs.h"
1086 /* Nothing whatsoever. */
1087 EOF
1088 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1089 libc_cv_need_minus_P=no
1090 else
1091 libc_cv_need_minus_P=yes
1092 fi
1093 rm -f conftest*])
1094 if test $libc_cv_need_minus_P = yes; then
1095 config_vars="$config_vars
1096 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1097 fi
1099 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1100 cat > conftest.s <<EOF
1101 ${libc_cv_dot_text}
1102 foo:
1103 .set glibc_conftest_frobozz,foo
1104 .globl glibc_conftest_frobozz
1105 EOF
1106 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1107 # (but it doesn't work), so we must do a linking check to be sure.
1108 cat > conftest1.c <<\EOF
1109 extern int glibc_conftest_frobozz;
1110 void _start() { glibc_conftest_frobozz = 1; }
1111 EOF
1112 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1113 -nostartfiles -nostdlib \
1114 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1115 libc_cv_asm_set_directive=yes
1116 else
1117 libc_cv_asm_set_directive=no
1118 fi
1119 rm -f conftest*])
1120 if test $libc_cv_asm_set_directive = yes; then
1121 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1122 fi
1124 AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
1125 libc_cv_asm_unique_object, [dnl
1126 cat > conftest.s <<EOF
1127 ${libc_cv_dot_text}
1128 _sym:
1129 .type _sym, %gnu_unique_object
1130 EOF
1131 if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1132 libc_cv_asm_unique_object=yes
1133 else
1134 libc_cv_asm_unique_object=no
1135 fi
1136 rm -f conftest*])
1137 if test $libc_cv_asm_unique_object = yes; then
1138 AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
1139 fi
1141 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1142 libc_cv_asm_protected_directive, [dnl
1143 cat > conftest.s <<EOF
1144 .protected foo
1145 foo:
1146 .hidden bar
1147 bar:
1148 EOF
1149 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1150 libc_cv_asm_protected_directive=yes
1151 else
1152 AC_MSG_ERROR(assembler support for symbol visibility is required)
1153 fi
1154 rm -f conftest*])
1156 if test $libc_cv_asm_protected_directive = yes; then
1157 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1158 libc_cv_visibility_attribute,
1159 [cat > conftest.c <<EOF
1160 int foo __attribute__ ((visibility ("hidden"))) = 1;
1161 int bar __attribute__ ((visibility ("protected"))) = 1;
1162 EOF
1163 libc_cv_visibility_attribute=no
1164 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1165 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1166 if grep '\.protected.*bar' conftest.s >/dev/null; then
1167 libc_cv_visibility_attribute=yes
1168 fi
1169 fi
1170 fi
1171 rm -f conftest.{c,s}
1172 ])
1173 if test $libc_cv_visibility_attribute != yes; then
1174 AC_MSG_ERROR(compiler support for visibility attribute is required)
1175 fi
1176 fi
1178 if test $libc_cv_visibility_attribute = yes; then
1179 AC_CACHE_CHECK(linker support for protected data symbol,
1180 libc_cv_protected_data,
1181 [cat > conftest.c <<EOF
1182 int bar __attribute__ ((visibility ("protected"))) = 1;
1183 EOF
1184 libc_cv_protected_data=no
1185 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
1186 cat > conftest.c <<EOF
1187 extern int bar;
1188 int main (void) { return bar; }
1189 EOF
1190 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
1191 libc_cv_protected_data=yes
1192 fi
1193 fi
1194 rm -f conftest.*
1195 ])
1196 else
1197 libc_cv_protected_data=no
1198 fi
1199 AC_SUBST(libc_cv_protected_data)
1201 if test $libc_cv_visibility_attribute = yes; then
1202 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1203 libc_cv_broken_visibility_attribute,
1204 [cat > conftest.c <<EOF
1205 int foo (int x);
1206 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1207 int bar (int x) { return x; }
1208 EOF
1209 libc_cv_broken_visibility_attribute=yes
1210 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1211 changequote(,)dnl
1212 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1213 changequote([,])dnl
1214 libc_cv_broken_visibility_attribute=no
1215 fi
1216 fi
1217 rm -f conftest.c conftest.s
1218 ])
1219 if test $libc_cv_broken_visibility_attribute = yes; then
1220 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1221 fi
1222 fi
1224 AC_CACHE_CHECK(for broken __attribute__((alias())),
1225 libc_cv_broken_alias_attribute,
1226 [cat > conftest.c <<EOF
1227 extern int foo (int x) __asm ("xyzzy");
1228 int bar (int x) { return x; }
1229 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1230 extern int dfoo;
1231 extern __typeof (dfoo) dfoo __asm ("abccb");
1232 int dfoo = 1;
1233 EOF
1234 libc_cv_broken_alias_attribute=yes
1235 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1236 if grep 'xyzzy' conftest.s >/dev/null &&
1237 grep 'abccb' conftest.s >/dev/null; then
1238 libc_cv_broken_alias_attribute=no
1239 fi
1240 fi
1241 rm -f conftest.c conftest.s
1242 ])
1243 if test $libc_cv_broken_alias_attribute = yes; then
1244 AC_MSG_ERROR(working alias attribute support required)
1245 fi
1247 if test $libc_cv_visibility_attribute = yes; then
1248 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1249 libc_cv_have_sdata_section,
1250 [echo "int i;" > conftest.c
1251 libc_cv_have_sdata_section=no
1252 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1253 | grep '\.sdata' >/dev/null; then
1254 libc_cv_have_sdata_section=yes
1255 fi
1256 rm -f conftest.c conftest.so
1257 ])
1258 if test $libc_cv_have_sdata_section = yes; then
1259 AC_DEFINE(HAVE_SDATA_SECTION)
1260 fi
1261 fi
1263 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1264 libc_cv_initfini_array, [dnl
1265 LIBC_TRY_LINK_STATIC([
1266 int foo (void) { return 1; }
1267 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1268 ],
1269 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1270 libc_cv_initfini_array=yes
1271 else
1272 libc_cv_initfini_array=no
1273 fi],
1274 [libc_cv_initfini_array=no])
1275 ])
1276 if test $libc_cv_initfini_array != yes; then
1277 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1278 fi
1280 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1281 libc_cv_ctors_header, [dnl
1282 libc_cv_ctors_header=yes
1283 LIBC_TRY_LINK_STATIC([
1284 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1285 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1286 ],
1287 [dnl
1288 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1289 { gsub(/\@<:@ */, "@<:@") }
1290 $2 == ".ctors" || $2 == ".dtors" {
1291 size = strtonum("0x" $6)
1292 align = strtonum("0x" $NF)
1293 seen@<:@$2@:>@ = 1
1294 stub@<:@$2@:>@ = size == align * 2
1295 }
1296 END {
1297 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1298 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1299 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1300 }
1301 '], [libc_cv_ctors_header=no])
1302 ], [dnl
1303 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1304 ])
1305 ])
1306 if test $libc_cv_ctors_header = no; then
1307 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1308 fi
1310 AC_CACHE_CHECK(for libunwind-support in compiler,
1311 libc_cv_cc_with_libunwind, [
1312 cat > conftest.c <<EOF
1313 int main (void) { return 0; }
1314 EOF
1315 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1316 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1317 libc_cv_cc_with_libunwind=yes
1318 else
1319 libc_cv_cc_with_libunwind=no
1320 fi
1321 rm -f conftest*])
1322 AC_SUBST(libc_cv_cc_with_libunwind)
1323 if test $libc_cv_cc_with_libunwind = yes; then
1324 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1325 fi
1327 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1328 [libc_cv_z_nodelete=yes],
1329 [AC_MSG_ERROR(linker with -z nodelete support required)])
1331 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1332 [libc_cv_z_nodlopen=yes],
1333 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1335 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1336 [libc_cv_z_initfirst=yes],
1337 [AC_MSG_ERROR(linker with -z initfirst support required)])
1339 AC_CACHE_CHECK(for -Bgroup option,
1340 libc_cv_Bgroup, [dnl
1341 cat > conftest.c <<EOF
1342 int _start (void) { return 42; }
1343 EOF
1344 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1345 -fPIC -shared -o conftest.so conftest.c
1346 -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
1347 then
1348 libc_cv_Bgroup=yes
1349 else
1350 libc_cv_Bgroup=no
1351 fi
1352 rm -f conftest*])
1353 AC_SUBST(libc_cv_Bgroup)
1355 ASFLAGS_config=
1356 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1357 libc_cv_as_noexecstack, [dnl
1358 cat > conftest.c <<EOF
1359 void foo (void) { }
1360 EOF
1361 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1362 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1363 && grep .note.GNU-stack conftest.s >/dev/null \
1364 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1365 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1366 then
1367 libc_cv_as_noexecstack=yes
1368 else
1369 libc_cv_as_noexecstack=no
1370 fi
1371 rm -f conftest*])
1372 if test $libc_cv_as_noexecstack = yes; then
1373 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1374 fi
1375 AC_SUBST(ASFLAGS_config)
1377 AC_CACHE_CHECK(for -z combreloc,
1378 libc_cv_z_combreloc, [dnl
1379 cat > conftest.c <<EOF
1380 extern int bar (int);
1381 extern int mumble;
1382 int foo (void) { return bar (mumble); }
1383 EOF
1384 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1385 -fPIC -shared -o conftest.so conftest.c
1386 -nostdlib -nostartfiles
1387 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1388 then
1389 dnl The following test is a bit weak. We must use a tool which can test
1390 dnl cross-platform since the gcc used can be a cross compiler. Without
1391 dnl introducing new options this is not easily doable. Instead use a tool
1392 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1393 dnl look for a section named .rel.dyn.
1394 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1395 libc_cv_z_combreloc=yes
1396 else
1397 libc_cv_z_combreloc=no
1398 fi
1399 else
1400 libc_cv_z_combreloc=no
1401 fi
1402 rm -f conftest*])
1403 if test "$libc_cv_z_combreloc" = yes; then
1404 AC_DEFINE(HAVE_Z_COMBRELOC)
1405 fi
1406 AC_SUBST(libc_cv_z_combreloc)
1408 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1409 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1410 AC_SUBST(libc_cv_z_execstack)
1412 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1413 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1414 ])
1416 AC_SUBST(libc_cv_fpie)
1418 AC_CACHE_CHECK(for --hash-style option,
1419 libc_cv_hashstyle, [dnl
1420 cat > conftest.c <<EOF
1421 int _start (void) { return 42; }
1422 EOF
1423 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1424 -fPIC -shared -o conftest.so conftest.c
1425 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1426 then
1427 libc_cv_hashstyle=yes
1428 else
1429 libc_cv_hashstyle=no
1430 fi
1431 rm -f conftest*])
1432 AC_SUBST(libc_cv_hashstyle)
1434 # The linker's default -shared behavior is good enough if it
1435 # does these things that our custom linker scripts ensure that
1436 # all allocated NOTE sections come first.
1437 if test "$use_default_link" = default; then
1438 AC_CACHE_CHECK([for sufficient default -shared layout],
1439 libc_cv_use_default_link, [dnl
1440 libc_cv_use_default_link=no
1441 cat > conftest.s <<\EOF
1442 .section .note.a,"a",%note
1443 .balign 4
1444 .long 4,4,9
1445 .string "GNU"
1446 .string "foo"
1447 .section .note.b,"a",%note
1448 .balign 4
1449 .long 4,4,9
1450 .string "GNU"
1451 .string "bar"
1452 EOF
1453 if AC_TRY_COMMAND([dnl
1454 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1455 ac_try=`$READELF -S conftest.so | sed -n \
1456 ['${x;p;}
1457 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1458 t a
1459 b
1460 : a
1461 H']`
1462 then
1463 libc_seen_a=no libc_seen_b=no
1464 set -- $ac_try
1465 while test $# -ge 2 -a "$1" = NOTE; do
1466 case "$2" in
1467 .note.a) libc_seen_a=yes ;;
1468 .note.b) libc_seen_b=yes ;;
1469 esac
1470 shift 2
1471 done
1472 case "$libc_seen_a$libc_seen_b" in
1473 yesyes)
1474 libc_cv_use_default_link=yes
1475 ;;
1476 *)
1477 echo >&AS_MESSAGE_LOG_FD "\
1478 $libc_seen_a$libc_seen_b from:
1479 $ac_try"
1480 ;;
1481 esac
1482 fi
1483 rm -f conftest*])
1484 use_default_link=$libc_cv_use_default_link
1485 fi
1487 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1488 if libc_cv_output_format=`
1489 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1490 then
1491 :
1492 else
1493 libc_cv_output_format=
1494 fi
1495 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1496 AC_SUBST(libc_cv_output_format)
1498 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1499 cat > conftest.c <<EOF
1500 int foo;
1501 EOF
1502 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1503 conftest.c 1>&AS_MESSAGE_LOG_FD])
1504 then
1505 libc_cv_fno_toplevel_reorder=yes
1506 else
1507 libc_cv_fno_toplevel_reorder=no
1508 fi
1509 rm -f conftest*])
1510 if test $libc_cv_fno_toplevel_reorder = yes; then
1511 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1512 else
1513 fno_unit_at_a_time=-fno-unit-at-a-time
1514 fi
1515 AC_SUBST(fno_unit_at_a_time)
1517 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1518 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1519 [libc_cv_ssp=yes],
1520 [libc_cv_ssp=no])
1521 ])
1522 AC_SUBST(libc_cv_ssp)
1524 AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
1525 cat > conftest.c <<EOF
1526 int foo;
1527 #ifdef __GNUC_GNU_INLINE__
1528 main () { return 0;}
1529 #else
1530 #error
1531 #endif
1532 EOF
1533 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
1534 -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
1535 then
1536 libc_cv_gnu89_inline=yes
1537 else
1538 libc_cv_gnu89_inline=no
1539 fi
1540 rm -f conftest*])
1541 if test $libc_cv_gnu89_inline = yes; then
1542 gnu89_inline=-fgnu89-inline
1543 else
1544 gnu89_inline=
1545 fi
1546 AC_SUBST(gnu89_inline)
1548 AC_CACHE_CHECK(whether cc puts quotes around section names,
1549 libc_cv_have_section_quotes,
1550 [cat > conftest.c <<EOF
1551 static const int foo
1552 __attribute__ ((section ("bar"))) = 1;
1553 EOF
1554 if ${CC-cc} -S conftest.c -o conftest.s; then
1555 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1556 libc_cv_have_section_quotes=yes
1557 else
1558 libc_cv_have_section_quotes=no
1559 fi
1560 else
1561 libc_cv_have_section_quotes=unknown
1562 fi
1563 rm -f conftest.{c,s}
1564 ])
1565 if test $libc_cv_have_section_quotes = yes; then
1566 AC_DEFINE(HAVE_SECTION_QUOTES)
1567 fi
1569 AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
1570 [dnl
1571 cat > conftest.s <<EOF
1572 ${libc_cv_dot_text}
1573 .globl foo
1574 foo:
1575 .weak foo
1576 .weak bar; bar = foo
1577 EOF
1578 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1579 libc_cv_asm_weak_directive=yes
1580 else
1581 libc_cv_asm_weak_directive=no
1582 fi
1583 rm -f conftest*])
1585 if test $libc_cv_asm_weak_directive = no; then
1586 AC_CACHE_CHECK(for assembler .weakext directive,
1587 libc_cv_asm_weakext_directive,
1588 [dnl
1589 cat > conftest.s <<EOF
1590 ${libc_cv_dot_text}
1591 .globl foo
1592 foo:
1593 .weakext bar foo
1594 .weakext baz
1595 .globl baz
1596 baz:
1597 EOF
1598 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
1599 libc_cv_asm_weakext_directive=yes
1600 else
1601 libc_cv_asm_weakext_directive=no
1602 fi
1603 rm -f conftest*])
1605 fi # no .weak
1607 if test $libc_cv_asm_weak_directive = yes; then
1608 AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
1609 elif test $libc_cv_asm_weakext_directive = yes; then
1610 AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
1611 fi
1613 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1614 cat > conftest.c <<\EOF
1615 _start () {}
1616 int __eh_pc;
1617 __throw () {}
1618 EOF
1619 dnl No \ in command here because it ends up inside ''.
1620 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1621 -nostdlib -nostartfiles -Wl,--no-whole-archive
1622 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1623 libc_cv_ld_no_whole_archive=yes
1624 else
1625 libc_cv_ld_no_whole_archive=no
1626 fi
1627 rm -f conftest*])
1628 if test $libc_cv_ld_no_whole_archive = no; then
1629 AC_MSG_ERROR([support for --no-whole-archive is needed])
1630 fi
1632 AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
1633 cat > conftest.c <<\EOF
1634 _start () {}
1635 int __eh_pc;
1636 __throw () {}
1637 EOF
1638 dnl No \ in command here because it ends up inside ''.
1639 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1640 -nostdlib -nostartfiles -fexceptions
1641 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1642 libc_cv_gcc_exceptions=yes
1643 else
1644 libc_cv_gcc_exceptions=no
1645 fi
1646 rm -f conftest*])
1647 if test $libc_cv_gcc_exceptions = yes; then
1648 exceptions=-fexceptions
1649 fi
1650 AC_SUBST(exceptions)dnl
1652 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1653 cat > conftest.c <<\EOF
1654 void zero (void *x)
1655 {
1656 __builtin_memset (x, 0, 1000);
1657 }
1658 EOF
1659 dnl
1660 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1661 then
1662 libc_cv_gcc_builtin_memset=no
1663 else
1664 libc_cv_gcc_builtin_memset=yes
1665 fi
1666 rm -f conftest* ])
1667 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1668 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1669 fi
1671 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1672 cat > conftest.c <<\EOF
1673 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1674 char *foo (const char *a, const char *b)
1675 {
1676 return __builtin_strstr (a, b);
1677 }
1678 EOF
1679 dnl
1680 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1681 then
1682 libc_cv_gcc_builtin_redirection=yes
1683 else
1684 libc_cv_gcc_builtin_redirection=no
1685 fi
1686 rm -f conftest* ])
1687 if test "$libc_cv_gcc_builtin_redirection" = no; then
1688 AC_MSG_ERROR([support for the symbol redirection needed])
1689 fi
1691 dnl Check whether the compiler supports the __thread keyword.
1692 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1693 [cat > conftest.c <<\EOF
1694 __thread int a = 42;
1695 EOF
1696 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1697 libc_cv_gcc___thread=yes
1698 else
1699 libc_cv_gcc___thread=no
1700 fi
1701 rm -f conftest*])
1702 if test "$libc_cv_gcc___thread" = no; then
1703 AC_MSG_ERROR([support for the __thread keyword is required])
1704 fi
1706 dnl Check whether the compiler supports the tls_model attribute.
1707 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1708 cat > conftest.c <<\EOF
1709 extern __thread int a __attribute__((tls_model ("initial-exec")));
1710 EOF
1711 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1712 libc_cv_gcc_tls_model_attr=yes
1713 else
1714 libc_cv_gcc_tls_model_attr=no
1715 fi
1716 rm -f conftest*])
1717 if test "$libc_cv_gcc_tls_model_attr" = no; then
1718 AC_MSG_ERROR([support for the tls_model attribute is required])
1719 fi
1721 dnl Determine how to disable generation of FMA instructions.
1722 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1723 libc_cv_cc_nofma, [dnl
1724 libc_cv_cc_nofma=
1725 for opt in -ffp-contract=off -mno-fused-madd; do
1726 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1727 done])
1728 AC_SUBST(libc_cv_cc_nofma)
1730 if test -n "$submachine"; then
1731 AC_CACHE_CHECK([for compiler option for CPU variant],
1732 libc_cv_cc_submachine, [dnl
1733 libc_cv_cc_submachine=no
1734 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1735 LIBC_TRY_CC_OPTION([$opt], [
1736 libc_cv_cc_submachine="$opt"
1737 break], [])
1738 done])
1739 if test "x$libc_cv_cc_submachine" = xno; then
1740 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1741 fi
1742 fi
1743 AC_SUBST(libc_cv_cc_submachine)
1745 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1746 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1747 cat > conftest.c <<EOF
1748 void
1749 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1750 foo (void) {}
1751 EOF
1752 libc_cv_cc_loop_to_function=no
1753 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1754 then
1755 libc_cv_cc_loop_to_function=yes
1756 fi
1757 rm -f conftest*])
1758 if test $libc_cv_cc_loop_to_function = yes; then
1759 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1760 fi
1761 AC_SUBST(libc_cv_cc_loop_to_function)
1763 dnl Check whether we have the gd library available.
1764 AC_MSG_CHECKING(for libgd)
1765 if test "$with_gd" != "no"; then
1766 old_CFLAGS="$CFLAGS"
1767 CFLAGS="$CFLAGS $libgd_include"
1768 old_LDFLAGS="$LDFLAGS"
1769 LDFLAGS="$LDFLAGS $libgd_ldflags"
1770 old_LIBS="$LIBS"
1771 LIBS="$LIBS -lgd -lpng -lz -lm"
1772 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1773 CFLAGS="$old_CFLAGS"
1774 LDFLAGS="$old_LDFLAGS"
1775 LIBS="$old_LIBS"
1776 else
1777 LIBGD=no
1778 fi
1779 AC_MSG_RESULT($LIBGD)
1780 AC_SUBST(LIBGD)
1782 # SELinux detection
1783 if test x$with_selinux = xno ; then
1784 have_selinux=no;
1785 else
1786 # See if we have the SELinux library
1787 AC_CHECK_LIB(selinux, is_selinux_enabled,
1788 have_selinux=yes, have_selinux=no)
1789 if test x$with_selinux = xyes ; then
1790 if test x$have_selinux = xno ; then
1791 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1792 fi
1793 fi
1794 fi
1795 # Check if we're building with SELinux support.
1796 if test "x$have_selinux" = xyes; then
1797 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1799 # See if we have the libaudit library
1800 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1801 have_libaudit=yes, have_libaudit=no)
1802 if test "x$have_libaudit" = xyes; then
1803 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1804 fi
1805 AC_SUBST(have_libaudit)
1807 # See if we have the libcap library
1808 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1809 if test "x$have_libcap" = xyes; then
1810 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1811 fi
1812 AC_SUBST(have_libcap)
1813 fi
1814 AC_SUBST(have_selinux)
1816 dnl check for the size of 'long double'.
1817 AC_CHECK_SIZEOF(long double, 0)
1818 sizeof_long_double=$ac_cv_sizeof_long_double
1819 AC_SUBST(sizeof_long_double)
1821 CPPUNDEFS=
1822 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1823 dnl Since we are building the implementations of the fortified functions here,
1824 dnl having the macro defined interacts very badly.
1825 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1826 [AC_TRY_COMPILE([], [
1827 #ifdef _FORTIFY_SOURCE
1828 # error bogon
1829 #endif],
1830 [libc_cv_predef_fortify_source=no],
1831 [libc_cv_predef_fortify_source=yes])])
1832 if test $libc_cv_predef_fortify_source = yes; then
1833 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1834 fi
1835 AC_SUBST(CPPUNDEFS)
1837 dnl Check for silly hacked compilers inserting -fstack-protector.
1838 dnl This breaks badly for the early startup code we compile, since
1839 dnl the compiled code can refer to a magic machine-dependent location
1840 dnl for the canary value before we have sufficient setup for that to
1841 dnl work. It's also questionable to build all of libc with this flag
1842 dnl even when you're doing that for most applications you build, since
1843 dnl libc's code is so heavily-used and performance-sensitive. If we
1844 dnl ever really want to make that work, it should be enabled explicitly
1845 dnl in the libc build, not inherited from implicit compiler settings.
1846 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1847 libc_cv_predef_stack_protector, [
1848 AC_TRY_COMPILE([extern void foobar (char *);],
1849 [char large_array[2048]; foobar (large_array);], [
1850 libc_undefs=`$NM -u conftest.o |
1851 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1852 2>&AS_MESSAGE_LOG_FD` || {
1853 AC_MSG_ERROR([confusing output from $NM -u])
1854 }
1855 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1856 # On some architectures, there are architecture-specific undefined
1857 # symbols (resolved by the linker), so filter out unknown symbols.
1858 # This will fail to produce the correct result if the compiler
1859 # defaults to -fstack-protector but this produces an undefined symbol
1860 # other than __stack_chk_fail. However, compilers like that have not
1861 # been encountered in practice.
1862 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1863 case "$libc_undefs" in
1864 foobar) libc_cv_predef_stack_protector=no ;;
1865 '__stack_chk_fail
1866 foobar') libc_cv_predef_stack_protector=yes ;;
1867 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1868 esac],
1869 [AC_MSG_ERROR([test compilation failed])])
1870 ])
1871 libc_extra_cflags=
1872 if test $libc_cv_predef_stack_protector = yes; then
1873 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1874 fi
1875 libc_extra_cppflags=
1877 # Some linkers on some architectures support __ehdr_start but with
1878 # bugs. Make sure usage of it does not create relocations in the
1879 # output (as the linker should resolve them all for us).
1880 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1881 libc_cv_ehdr_start, [
1882 old_CFLAGS="$CFLAGS"
1883 old_LDFLAGS="$LDFLAGS"
1884 old_LIBS="$LIBS"
1885 CFLAGS="$CFLAGS -fPIC"
1886 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1887 LIBS=
1888 AC_LINK_IFELSE([AC_LANG_SOURCE([
1889 typedef struct {
1890 char foo;
1891 long val;
1892 } Ehdr;
1893 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1894 long ehdr (void) { return __ehdr_start.val; }
1895 ])],
1896 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1897 libc_cv_ehdr_start=broken
1898 else
1899 libc_cv_ehdr_start=yes
1900 fi], [libc_cv_ehdr_start=no])
1901 CFLAGS="$old_CFLAGS"
1902 LDFLAGS="$old_LDFLAGS"
1903 LIBS="$old_LIBS"
1904 ])
1905 if test "$libc_cv_ehdr_start" = yes; then
1906 AC_DEFINE([HAVE_EHDR_START])
1907 elif test "$libc_cv_ehdr_start" = broken; then
1908 AC_MSG_WARN([linker is broken -- you should upgrade])
1909 fi
1911 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1912 libc_cv_builtin_trap, [dnl
1913 libc_cv_builtin_trap=no
1914 AC_TRY_COMPILE([], [__builtin_trap ()], [
1915 libc_undefs=`$NM -u conftest.o |
1916 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1917 2>&AS_MESSAGE_LOG_FD` || {
1918 AC_MSG_ERROR([confusing output from $NM -u])
1919 }
1920 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1921 if test -z "$libc_undefs"; then
1922 libc_cv_builtin_trap=yes
1923 fi])])
1924 if test $libc_cv_builtin_trap = yes; then
1925 AC_DEFINE([HAVE_BUILTIN_TRAP])
1926 fi
1928 dnl C++ feature tests.
1929 AC_LANG_PUSH([C++])
1931 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1932 libc_cv_cxx_thread_local, [
1933 old_CXXFLAGS="$CXXFLAGS"
1934 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1935 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1936 #include <thread>
1938 // Compiler support.
1939 struct S
1940 {
1941 S ();
1942 ~S ();
1943 };
1944 thread_local S s;
1945 S * get () { return &s; }
1947 // libstdc++ support.
1948 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1949 #error __cxa_thread_atexit_impl not supported
1950 #endif
1951 ])],
1952 [libc_cv_cxx_thread_local=yes],
1953 [libc_cv_cxx_thread_local=no])
1954 CXXFLAGS="$old_CXXFLAGS"
1955 ])
1956 AC_SUBST(libc_cv_cxx_thread_local)
1958 AC_LANG_POP([C++])
1959 dnl End of C++ feature tests.
1961 ### End of automated tests.
1962 ### Now run sysdeps configure fragments.
1964 # They also can set these variables.
1965 use_ldconfig=no
1966 ldd_rewrite_script=no
1967 libc_cv_sysconfdir=$sysconfdir
1968 libc_cv_localstatedir=$localstatedir
1969 libc_cv_gcc_unwind_find_fde=no
1970 libc_cv_idn=no
1972 # Iterate over all the sysdep directories we will use, running their
1973 # configure fragments.
1974 for dir in $sysnames; do
1975 case $dir in
1976 /*) dest=$dir ;;
1977 *) dest=$srcdir/$dir ;;
1978 esac
1979 if test -r $dest/configure; then
1980 AC_MSG_RESULT(running configure fragment for $dir)
1981 . $dest/configure
1982 fi
1983 done
1985 if test x"$build_mathvec" = xnotset; then
1986 build_mathvec=no
1987 fi
1988 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1990 AC_SUBST(libc_extra_cflags)
1991 AC_SUBST(libc_extra_cppflags)
1993 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1994 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1995 fi
1996 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1998 # A sysdeps configure fragment can reset this if IFUNC is not actually
1999 # usable even though the assembler knows how to generate the symbol type.
2000 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
2001 AC_DEFINE(HAVE_IFUNC)
2002 fi
2004 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
2005 # configure fragment can override the value to prevent this AC_DEFINE.
2006 AC_SUBST(use_nscd)
2007 if test "x$use_nscd" != xno; then
2008 AC_DEFINE([USE_NSCD])
2009 fi
2010 if test "x$build_nscd" = xdefault; then
2011 build_nscd=$use_nscd
2012 fi
2014 # Test for old glibc 2.0.x headers so that they can be removed properly
2015 # Search only in includedir.
2016 AC_MSG_CHECKING(for old glibc 2.0.x headers)
2017 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
2018 then
2019 old_glibc_headers=yes
2020 else
2021 old_glibc_headers=no
2022 fi
2023 AC_MSG_RESULT($old_glibc_headers)
2024 if test ${old_glibc_headers} = yes; then
2025 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
2026 AC_MSG_WARN(*** be removed.)
2027 fi
2028 AC_SUBST(old_glibc_headers)
2030 AC_SUBST(libc_cv_slibdir)
2031 AC_SUBST(libc_cv_rtlddir)
2032 AC_SUBST(libc_cv_localedir)
2033 AC_SUBST(libc_cv_sysconfdir)
2034 AC_SUBST(libc_cv_localstatedir)
2035 AC_SUBST(libc_cv_rootsbindir)
2036 AC_SUBST(libc_cv_forced_unwind)
2038 if test x$use_ldconfig = xyes; then
2039 AC_DEFINE(USE_LDCONFIG)
2040 fi
2041 AC_SUBST(use_ldconfig)
2042 AC_SUBST(ldd_rewrite_script)
2044 AC_SUBST(static)
2045 AC_SUBST(shared)
2047 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
2048 [libc_cv_pic_default=yes
2049 cat > conftest.c <<EOF
2050 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
2051 # error PIC is default.
2052 #endif
2053 EOF
2054 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2055 libc_cv_pic_default=no
2056 fi
2057 rm -f conftest.*])
2058 AC_SUBST(libc_cv_pic_default)
2060 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
2061 [libc_cv_pie_default=yes
2062 cat > conftest.c <<EOF
2063 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
2064 # error PIE is default.
2065 #endif
2066 EOF
2067 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
2068 libc_cv_pie_default=no
2069 fi
2070 rm -f conftest.*])
2071 AC_SUBST(libc_cv_pie_default)
2073 AC_SUBST(profile)
2074 AC_SUBST(static_nss)
2076 AC_SUBST(DEFINES)
2078 dnl See sysdeps/mach/configure.ac for this variable.
2079 AC_SUBST(mach_interface_list)
2081 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
2082 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
2083 AC_SUBST(VERSION)
2084 AC_SUBST(RELEASE)
2086 AC_CONFIG_FILES([config.make Makefile])
2087 AC_CONFIG_COMMANDS([default],[[
2088 case $CONFIG_FILES in *config.make*)
2089 echo "$config_vars" >> config.make;;
2090 esac
2091 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
2092 AC_OUTPUT