| blob | e502aa5db2fe1d114f95b2e5ca718bd5c45e8095 |
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=$enableval],
161 [profile=no])
162 AC_ARG_ENABLE([timezone-tools],
163 AC_HELP_STRING([--disable-timezone-tools],
164 [do not install timezone tools @<:@default=install@:>@]),
165 [enable_timezone_tools=$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 $libc_cv_asm_set_directive = yes; then
1121 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1122 fi
1124 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1125 libc_cv_asm_protected_directive, [dnl
1126 cat > conftest.s <<EOF
1127 .protected foo
1128 foo:
1129 .hidden bar
1130 bar:
1131 EOF
1132 if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
1133 libc_cv_asm_protected_directive=yes
1134 else
1135 AC_MSG_ERROR(assembler support for symbol visibility is required)
1136 fi
1137 rm -f conftest*])
1139 if test $libc_cv_asm_protected_directive = yes; then
1140 AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
1141 libc_cv_visibility_attribute,
1142 [cat > conftest.c <<EOF
1143 int foo __attribute__ ((visibility ("hidden"))) = 1;
1144 int bar __attribute__ ((visibility ("protected"))) = 1;
1145 EOF
1146 libc_cv_visibility_attribute=no
1147 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1148 if grep '\.hidden.*foo' conftest.s >/dev/null; then
1149 if grep '\.protected.*bar' conftest.s >/dev/null; then
1150 libc_cv_visibility_attribute=yes
1151 fi
1152 fi
1153 fi
1154 rm -f conftest.{c,s}
1155 ])
1156 if test $libc_cv_visibility_attribute != yes; then
1157 AC_MSG_ERROR(compiler support for visibility attribute is required)
1158 fi
1159 fi
1161 if test $libc_cv_visibility_attribute = yes; then
1162 AC_CACHE_CHECK(linker support for protected data symbol,
1163 libc_cv_protected_data,
1164 [cat > conftest.c <<EOF
1165 int bar __attribute__ ((visibility ("protected"))) = 1;
1166 EOF
1167 libc_cv_protected_data=no
1168 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
1169 cat > conftest.c <<EOF
1170 extern int bar;
1171 int main (void) { return bar; }
1172 EOF
1173 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
1174 libc_cv_protected_data=yes
1175 fi
1176 fi
1177 rm -f conftest.*
1178 ])
1179 else
1180 libc_cv_protected_data=no
1181 fi
1182 AC_SUBST(libc_cv_protected_data)
1184 if test $libc_cv_visibility_attribute = yes; then
1185 AC_CACHE_CHECK(for broken __attribute__((visibility())),
1186 libc_cv_broken_visibility_attribute,
1187 [cat > conftest.c <<EOF
1188 int foo (int x);
1189 int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
1190 int bar (int x) { return x; }
1191 EOF
1192 libc_cv_broken_visibility_attribute=yes
1193 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1194 changequote(,)dnl
1195 if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
1196 changequote([,])dnl
1197 libc_cv_broken_visibility_attribute=no
1198 fi
1199 fi
1200 rm -f conftest.c conftest.s
1201 ])
1202 if test $libc_cv_broken_visibility_attribute = yes; then
1203 AC_MSG_ERROR(working compiler support for visibility attribute is required)
1204 fi
1205 fi
1207 AC_CACHE_CHECK(for broken __attribute__((alias())),
1208 libc_cv_broken_alias_attribute,
1209 [cat > conftest.c <<EOF
1210 extern int foo (int x) __asm ("xyzzy");
1211 int bar (int x) { return x; }
1212 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1213 extern int dfoo;
1214 extern __typeof (dfoo) dfoo __asm ("abccb");
1215 int dfoo = 1;
1216 EOF
1217 libc_cv_broken_alias_attribute=yes
1218 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1219 if grep 'xyzzy' conftest.s >/dev/null &&
1220 grep 'abccb' conftest.s >/dev/null; then
1221 libc_cv_broken_alias_attribute=no
1222 fi
1223 fi
1224 rm -f conftest.c conftest.s
1225 ])
1226 if test $libc_cv_broken_alias_attribute = yes; then
1227 AC_MSG_ERROR(working alias attribute support required)
1228 fi
1230 if test $libc_cv_visibility_attribute = yes; then
1231 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1232 libc_cv_have_sdata_section,
1233 [echo "int i;" > conftest.c
1234 libc_cv_have_sdata_section=no
1235 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1236 | grep '\.sdata' >/dev/null; then
1237 libc_cv_have_sdata_section=yes
1238 fi
1239 rm -f conftest.c conftest.so
1240 ])
1241 if test $libc_cv_have_sdata_section = yes; then
1242 AC_DEFINE(HAVE_SDATA_SECTION)
1243 fi
1244 fi
1246 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
1247 libc_cv_initfini_array, [dnl
1248 LIBC_TRY_LINK_STATIC([
1249 int foo (void) { return 1; }
1250 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
1251 ],
1252 [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
1253 libc_cv_initfini_array=yes
1254 else
1255 libc_cv_initfini_array=no
1256 fi],
1257 [libc_cv_initfini_array=no])
1258 ])
1259 if test $libc_cv_initfini_array != yes; then
1260 AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
1261 fi
1263 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1264 libc_cv_ctors_header, [dnl
1265 libc_cv_ctors_header=yes
1266 LIBC_TRY_LINK_STATIC([
1267 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1268 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1269 ],
1270 [dnl
1271 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1272 { gsub(/\@<:@ */, "@<:@") }
1273 $2 == ".ctors" || $2 == ".dtors" {
1274 size = strtonum("0x" $6)
1275 align = strtonum("0x" $NF)
1276 seen@<:@$2@:>@ = 1
1277 stub@<:@$2@:>@ = size == align * 2
1278 }
1279 END {
1280 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1281 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1282 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1283 }
1284 '], [libc_cv_ctors_header=no])
1285 ], [dnl
1286 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1287 ])
1288 ])
1289 if test $libc_cv_ctors_header = no; then
1290 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1291 fi
1293 AC_CACHE_CHECK(for libunwind-support in compiler,
1294 libc_cv_cc_with_libunwind, [
1295 cat > conftest.c <<EOF
1296 int main (void) { return 0; }
1297 EOF
1298 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1299 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1300 libc_cv_cc_with_libunwind=yes
1301 else
1302 libc_cv_cc_with_libunwind=no
1303 fi
1304 rm -f conftest*])
1305 AC_SUBST(libc_cv_cc_with_libunwind)
1306 if test $libc_cv_cc_with_libunwind = yes; then
1307 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1308 fi
1310 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1311 [libc_cv_z_nodelete=yes],
1312 [AC_MSG_ERROR(linker with -z nodelete support required)])
1314 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1315 [libc_cv_z_nodlopen=yes],
1316 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1318 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1319 [libc_cv_z_initfirst=yes],
1320 [AC_MSG_ERROR(linker with -z initfirst support required)])
1322 ASFLAGS_config=
1323 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1324 libc_cv_as_noexecstack, [dnl
1325 cat > conftest.c <<EOF
1326 void foo (void) { }
1327 EOF
1328 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1329 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1330 && grep .note.GNU-stack conftest.s >/dev/null \
1331 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1332 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1333 then
1334 libc_cv_as_noexecstack=yes
1335 else
1336 libc_cv_as_noexecstack=no
1337 fi
1338 rm -f conftest*])
1339 if test $libc_cv_as_noexecstack = yes; then
1340 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1341 fi
1342 AC_SUBST(ASFLAGS_config)
1344 AC_CACHE_CHECK(for -z combreloc,
1345 libc_cv_z_combreloc, [dnl
1346 cat > conftest.c <<EOF
1347 extern int bar (int);
1348 extern int mumble;
1349 int foo (void) { return bar (mumble); }
1350 EOF
1351 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1352 -fPIC -shared -o conftest.so conftest.c
1353 -nostdlib -nostartfiles
1354 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1355 then
1356 dnl The following test is a bit weak. We must use a tool which can test
1357 dnl cross-platform since the gcc used can be a cross compiler. Without
1358 dnl introducing new options this is not easily doable. Instead use a tool
1359 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1360 dnl look for a section named .rel.dyn.
1361 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1362 libc_cv_z_combreloc=yes
1363 else
1364 libc_cv_z_combreloc=no
1365 fi
1366 else
1367 libc_cv_z_combreloc=no
1368 fi
1369 rm -f conftest*])
1370 if test "$libc_cv_z_combreloc" = yes; then
1371 AC_DEFINE(HAVE_Z_COMBRELOC)
1372 fi
1373 AC_SUBST(libc_cv_z_combreloc)
1375 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1376 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1377 AC_SUBST(libc_cv_z_execstack)
1379 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1380 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1381 ])
1383 AC_SUBST(libc_cv_fpie)
1385 AC_CACHE_CHECK(for --hash-style option,
1386 libc_cv_hashstyle, [dnl
1387 cat > conftest.c <<EOF
1388 int _start (void) { return 42; }
1389 EOF
1390 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1391 -fPIC -shared -o conftest.so conftest.c
1392 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1393 then
1394 libc_cv_hashstyle=yes
1395 else
1396 libc_cv_hashstyle=no
1397 fi
1398 rm -f conftest*])
1399 AC_SUBST(libc_cv_hashstyle)
1401 # The linker's default -shared behavior is good enough if it
1402 # does these things that our custom linker scripts ensure that
1403 # all allocated NOTE sections come first.
1404 if test "$use_default_link" = default; then
1405 AC_CACHE_CHECK([for sufficient default -shared layout],
1406 libc_cv_use_default_link, [dnl
1407 libc_cv_use_default_link=no
1408 cat > conftest.s <<\EOF
1409 .section .note.a,"a",%note
1410 .balign 4
1411 .long 4,4,9
1412 .string "GNU"
1413 .string "foo"
1414 .section .note.b,"a",%note
1415 .balign 4
1416 .long 4,4,9
1417 .string "GNU"
1418 .string "bar"
1419 EOF
1420 if AC_TRY_COMMAND([dnl
1421 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1422 ac_try=`$READELF -S conftest.so | sed -n \
1423 ['${x;p;}
1424 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1425 t a
1426 b
1427 : a
1428 H']`
1429 then
1430 libc_seen_a=no libc_seen_b=no
1431 set -- $ac_try
1432 while test $# -ge 2 -a "$1" = NOTE; do
1433 case "$2" in
1434 .note.a) libc_seen_a=yes ;;
1435 .note.b) libc_seen_b=yes ;;
1436 esac
1437 shift 2
1438 done
1439 case "$libc_seen_a$libc_seen_b" in
1440 yesyes)
1441 libc_cv_use_default_link=yes
1442 ;;
1443 *)
1444 echo >&AS_MESSAGE_LOG_FD "\
1445 $libc_seen_a$libc_seen_b from:
1446 $ac_try"
1447 ;;
1448 esac
1449 fi
1450 rm -f conftest*])
1451 use_default_link=$libc_cv_use_default_link
1452 fi
1454 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1455 if libc_cv_output_format=`
1456 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1457 then
1458 :
1459 else
1460 libc_cv_output_format=
1461 fi
1462 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1463 AC_SUBST(libc_cv_output_format)
1465 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1466 cat > conftest.c <<EOF
1467 int foo;
1468 EOF
1469 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1470 conftest.c 1>&AS_MESSAGE_LOG_FD])
1471 then
1472 libc_cv_fno_toplevel_reorder=yes
1473 else
1474 libc_cv_fno_toplevel_reorder=no
1475 fi
1476 rm -f conftest*])
1477 if test $libc_cv_fno_toplevel_reorder = yes; then
1478 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1479 else
1480 fno_unit_at_a_time=-fno-unit-at-a-time
1481 fi
1482 AC_SUBST(fno_unit_at_a_time)
1484 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1485 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1486 [libc_cv_ssp=yes],
1487 [libc_cv_ssp=no])
1488 ])
1490 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
1491 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
1492 [libc_cv_ssp_strong=yes],
1493 [libc_cv_ssp_strong=no])
1494 ])
1496 stack_protector=
1497 if test "$libc_cv_ssp_strong" = "yes"; then
1498 stack_protector="-fstack-protector-strong"
1499 elif test "$libc_cv_ssp" = "yes"; then
1500 stack_protector="-fstack-protector"
1501 fi
1502 AC_SUBST(stack_protector)
1504 AC_CACHE_CHECK(whether cc puts quotes around section names,
1505 libc_cv_have_section_quotes,
1506 [cat > conftest.c <<EOF
1507 static const int foo
1508 __attribute__ ((section ("bar"))) = 1;
1509 EOF
1510 if ${CC-cc} -S conftest.c -o conftest.s; then
1511 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1512 libc_cv_have_section_quotes=yes
1513 else
1514 libc_cv_have_section_quotes=no
1515 fi
1516 else
1517 libc_cv_have_section_quotes=unknown
1518 fi
1519 rm -f conftest.{c,s}
1520 ])
1521 if test $libc_cv_have_section_quotes = yes; then
1522 AC_DEFINE(HAVE_SECTION_QUOTES)
1523 fi
1525 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1526 cat > conftest.c <<\EOF
1527 _start () {}
1528 int __eh_pc;
1529 __throw () {}
1530 EOF
1531 dnl No \ in command here because it ends up inside ''.
1532 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1533 -nostdlib -nostartfiles -Wl,--no-whole-archive
1534 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1535 libc_cv_ld_no_whole_archive=yes
1536 else
1537 libc_cv_ld_no_whole_archive=no
1538 fi
1539 rm -f conftest*])
1540 if test $libc_cv_ld_no_whole_archive = no; then
1541 AC_MSG_ERROR([support for --no-whole-archive is needed])
1542 fi
1544 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1545 cat > conftest.c <<\EOF
1546 void zero (void *x)
1547 {
1548 __builtin_memset (x, 0, 1000);
1549 }
1550 EOF
1551 dnl
1552 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1553 then
1554 libc_cv_gcc_builtin_memset=no
1555 else
1556 libc_cv_gcc_builtin_memset=yes
1557 fi
1558 rm -f conftest* ])
1559 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1560 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1561 fi
1563 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1564 cat > conftest.c <<\EOF
1565 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1566 char *foo (const char *a, const char *b)
1567 {
1568 return __builtin_strstr (a, b);
1569 }
1570 EOF
1571 dnl
1572 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1573 then
1574 libc_cv_gcc_builtin_redirection=yes
1575 else
1576 libc_cv_gcc_builtin_redirection=no
1577 fi
1578 rm -f conftest* ])
1579 if test "$libc_cv_gcc_builtin_redirection" = no; then
1580 AC_MSG_ERROR([support for the symbol redirection needed])
1581 fi
1583 dnl Check whether the compiler supports the __thread keyword.
1584 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1585 [cat > conftest.c <<\EOF
1586 __thread int a = 42;
1587 EOF
1588 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1589 libc_cv_gcc___thread=yes
1590 else
1591 libc_cv_gcc___thread=no
1592 fi
1593 rm -f conftest*])
1594 if test "$libc_cv_gcc___thread" = no; then
1595 AC_MSG_ERROR([support for the __thread keyword is required])
1596 fi
1598 dnl Check whether the compiler supports the tls_model attribute.
1599 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1600 cat > conftest.c <<\EOF
1601 extern __thread int a __attribute__((tls_model ("initial-exec")));
1602 EOF
1603 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1604 libc_cv_gcc_tls_model_attr=yes
1605 else
1606 libc_cv_gcc_tls_model_attr=no
1607 fi
1608 rm -f conftest*])
1609 if test "$libc_cv_gcc_tls_model_attr" = no; then
1610 AC_MSG_ERROR([support for the tls_model attribute is required])
1611 fi
1613 dnl Determine how to disable generation of FMA instructions.
1614 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1615 libc_cv_cc_nofma, [dnl
1616 libc_cv_cc_nofma=
1617 for opt in -ffp-contract=off -mno-fused-madd; do
1618 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1619 done])
1620 AC_SUBST(libc_cv_cc_nofma)
1622 if test -n "$submachine"; then
1623 AC_CACHE_CHECK([for compiler option for CPU variant],
1624 libc_cv_cc_submachine, [dnl
1625 libc_cv_cc_submachine=no
1626 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1627 LIBC_TRY_CC_OPTION([$opt], [
1628 libc_cv_cc_submachine="$opt"
1629 break], [])
1630 done])
1631 if test "x$libc_cv_cc_submachine" = xno; then
1632 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1633 fi
1634 fi
1635 AC_SUBST(libc_cv_cc_submachine)
1637 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1638 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1639 cat > conftest.c <<EOF
1640 void
1641 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1642 foo (void) {}
1643 EOF
1644 libc_cv_cc_loop_to_function=no
1645 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1646 then
1647 libc_cv_cc_loop_to_function=yes
1648 fi
1649 rm -f conftest*])
1650 if test $libc_cv_cc_loop_to_function = yes; then
1651 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1652 fi
1653 AC_SUBST(libc_cv_cc_loop_to_function)
1655 dnl Check whether we have the gd library available.
1656 AC_MSG_CHECKING(for libgd)
1657 if test "$with_gd" != "no"; then
1658 old_CFLAGS="$CFLAGS"
1659 CFLAGS="$CFLAGS $libgd_include"
1660 old_LDFLAGS="$LDFLAGS"
1661 LDFLAGS="$LDFLAGS $libgd_ldflags"
1662 old_LIBS="$LIBS"
1663 LIBS="$LIBS -lgd -lpng -lz -lm"
1664 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1665 CFLAGS="$old_CFLAGS"
1666 LDFLAGS="$old_LDFLAGS"
1667 LIBS="$old_LIBS"
1668 else
1669 LIBGD=no
1670 fi
1671 AC_MSG_RESULT($LIBGD)
1672 AC_SUBST(LIBGD)
1674 # SELinux detection
1675 if test x$with_selinux = xno ; then
1676 have_selinux=no;
1677 else
1678 # See if we have the SELinux library
1679 AC_CHECK_LIB(selinux, is_selinux_enabled,
1680 have_selinux=yes, have_selinux=no)
1681 if test x$with_selinux = xyes ; then
1682 if test x$have_selinux = xno ; then
1683 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1684 fi
1685 fi
1686 fi
1687 # Check if we're building with SELinux support.
1688 if test "x$have_selinux" = xyes; then
1689 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1691 # See if we have the libaudit library
1692 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1693 have_libaudit=yes, have_libaudit=no)
1694 if test "x$have_libaudit" = xyes; then
1695 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1696 fi
1697 AC_SUBST(have_libaudit)
1699 # See if we have the libcap library
1700 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1701 if test "x$have_libcap" = xyes; then
1702 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1703 fi
1704 AC_SUBST(have_libcap)
1705 fi
1706 AC_SUBST(have_selinux)
1708 CPPUNDEFS=
1709 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1710 dnl Since we are building the implementations of the fortified functions here,
1711 dnl having the macro defined interacts very badly.
1712 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1713 [AC_TRY_COMPILE([], [
1714 #ifdef _FORTIFY_SOURCE
1715 # error bogon
1716 #endif],
1717 [libc_cv_predef_fortify_source=no],
1718 [libc_cv_predef_fortify_source=yes])])
1719 if test $libc_cv_predef_fortify_source = yes; then
1720 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1721 fi
1722 AC_SUBST(CPPUNDEFS)
1724 dnl Check for silly hacked compilers inserting -fstack-protector.
1725 dnl This breaks badly for the early startup code we compile, since
1726 dnl the compiled code can refer to a magic machine-dependent location
1727 dnl for the canary value before we have sufficient setup for that to
1728 dnl work. It's also questionable to build all of libc with this flag
1729 dnl even when you're doing that for most applications you build, since
1730 dnl libc's code is so heavily-used and performance-sensitive. If we
1731 dnl ever really want to make that work, it should be enabled explicitly
1732 dnl in the libc build, not inherited from implicit compiler settings.
1733 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1734 libc_cv_predef_stack_protector, [
1735 AC_TRY_COMPILE([extern void foobar (char *);],
1736 [char large_array[2048]; foobar (large_array);], [
1737 libc_undefs=`$NM -u conftest.o |
1738 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1739 2>&AS_MESSAGE_LOG_FD` || {
1740 AC_MSG_ERROR([confusing output from $NM -u])
1741 }
1742 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1743 # On some architectures, there are architecture-specific undefined
1744 # symbols (resolved by the linker), so filter out unknown symbols.
1745 # This will fail to produce the correct result if the compiler
1746 # defaults to -fstack-protector but this produces an undefined symbol
1747 # other than __stack_chk_fail. However, compilers like that have not
1748 # been encountered in practice.
1749 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1750 case "$libc_undefs" in
1751 foobar) libc_cv_predef_stack_protector=no ;;
1752 '__stack_chk_fail
1753 foobar') libc_cv_predef_stack_protector=yes ;;
1754 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1755 esac],
1756 [AC_MSG_ERROR([test compilation failed])])
1757 ])
1758 libc_extra_cflags=
1759 if test $libc_cv_predef_stack_protector = yes; then
1760 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1761 fi
1762 libc_extra_cppflags=
1764 # Some linkers on some architectures support __ehdr_start but with
1765 # bugs. Make sure usage of it does not create relocations in the
1766 # output (as the linker should resolve them all for us).
1767 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1768 libc_cv_ehdr_start, [
1769 old_CFLAGS="$CFLAGS"
1770 old_LDFLAGS="$LDFLAGS"
1771 old_LIBS="$LIBS"
1772 CFLAGS="$CFLAGS -fPIC"
1773 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1774 LIBS=
1775 AC_LINK_IFELSE([AC_LANG_SOURCE([
1776 typedef struct {
1777 char foo;
1778 long val;
1779 } Ehdr;
1780 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1781 long ehdr (void) { return __ehdr_start.val; }
1782 ])],
1783 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1784 libc_cv_ehdr_start=broken
1785 else
1786 libc_cv_ehdr_start=yes
1787 fi], [libc_cv_ehdr_start=no])
1788 CFLAGS="$old_CFLAGS"
1789 LDFLAGS="$old_LDFLAGS"
1790 LIBS="$old_LIBS"
1791 ])
1792 if test "$libc_cv_ehdr_start" = yes; then
1793 AC_DEFINE([HAVE_EHDR_START])
1794 elif test "$libc_cv_ehdr_start" = broken; then
1795 AC_MSG_WARN([linker is broken -- you should upgrade])
1796 fi
1798 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1799 libc_cv_builtin_trap, [dnl
1800 libc_cv_builtin_trap=no
1801 AC_TRY_COMPILE([], [__builtin_trap ()], [
1802 libc_undefs=`$NM -u conftest.o |
1803 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1804 2>&AS_MESSAGE_LOG_FD` || {
1805 AC_MSG_ERROR([confusing output from $NM -u])
1806 }
1807 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1808 if test -z "$libc_undefs"; then
1809 libc_cv_builtin_trap=yes
1810 fi])])
1811 if test $libc_cv_builtin_trap = yes; then
1812 AC_DEFINE([HAVE_BUILTIN_TRAP])
1813 fi
1815 dnl C++ feature tests.
1816 AC_LANG_PUSH([C++])
1818 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1819 libc_cv_cxx_thread_local, [
1820 old_CXXFLAGS="$CXXFLAGS"
1821 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1822 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1823 #include <thread>
1825 // Compiler support.
1826 struct S
1827 {
1828 S ();
1829 ~S ();
1830 };
1831 thread_local S s;
1832 S * get () { return &s; }
1834 // libstdc++ support.
1835 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1836 #error __cxa_thread_atexit_impl not supported
1837 #endif
1838 ])],
1839 [libc_cv_cxx_thread_local=yes],
1840 [libc_cv_cxx_thread_local=no])
1841 CXXFLAGS="$old_CXXFLAGS"
1842 ])
1843 AC_SUBST(libc_cv_cxx_thread_local)
1845 AC_LANG_POP([C++])
1846 dnl End of C++ feature tests.
1848 ### End of automated tests.
1849 ### Now run sysdeps configure fragments.
1851 # They also can set these variables.
1852 use_ldconfig=no
1853 ldd_rewrite_script=no
1854 libc_cv_sysconfdir=$sysconfdir
1855 libc_cv_localstatedir=$localstatedir
1856 libc_cv_gcc_unwind_find_fde=no
1857 libc_cv_idn=no
1859 # Iterate over all the sysdep directories we will use, running their
1860 # configure fragments.
1861 for dir in $sysnames; do
1862 case $dir in
1863 /*) dest=$dir ;;
1864 *) dest=$srcdir/$dir ;;
1865 esac
1866 if test -r $dest/configure; then
1867 AC_MSG_RESULT(running configure fragment for $dir)
1868 . $dest/configure
1869 fi
1870 done
1872 if test x"$build_mathvec" = xnotset; then
1873 build_mathvec=no
1874 fi
1875 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1877 AC_SUBST(libc_extra_cflags)
1878 AC_SUBST(libc_extra_cppflags)
1880 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1881 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1882 fi
1883 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1885 # A sysdeps configure fragment can reset this if IFUNC is not actually
1886 # usable even though the assembler knows how to generate the symbol type.
1887 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1888 AC_DEFINE(HAVE_IFUNC)
1889 fi
1891 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1892 # configure fragment can override the value to prevent this AC_DEFINE.
1893 AC_SUBST(use_nscd)
1894 if test "x$use_nscd" != xno; then
1895 AC_DEFINE([USE_NSCD])
1896 fi
1897 if test "x$build_nscd" = xdefault; then
1898 build_nscd=$use_nscd
1899 fi
1901 # Test for old glibc 2.0.x headers so that they can be removed properly
1902 # Search only in includedir.
1903 AC_MSG_CHECKING(for old glibc 2.0.x headers)
1904 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
1905 then
1906 old_glibc_headers=yes
1907 else
1908 old_glibc_headers=no
1909 fi
1910 AC_MSG_RESULT($old_glibc_headers)
1911 if test ${old_glibc_headers} = yes; then
1912 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
1913 AC_MSG_WARN(*** be removed.)
1914 fi
1915 AC_SUBST(old_glibc_headers)
1917 AC_SUBST(libc_cv_slibdir)
1918 AC_SUBST(libc_cv_rtlddir)
1919 AC_SUBST(libc_cv_localedir)
1920 AC_SUBST(libc_cv_sysconfdir)
1921 AC_SUBST(libc_cv_localstatedir)
1922 AC_SUBST(libc_cv_rootsbindir)
1923 AC_SUBST(libc_cv_forced_unwind)
1925 if test x$use_ldconfig = xyes; then
1926 AC_DEFINE(USE_LDCONFIG)
1927 fi
1928 AC_SUBST(use_ldconfig)
1929 AC_SUBST(ldd_rewrite_script)
1931 AC_SUBST(static)
1932 AC_SUBST(shared)
1934 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1935 [libc_cv_pic_default=yes
1936 cat > conftest.c <<EOF
1937 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1938 # error PIC is default.
1939 #endif
1940 EOF
1941 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1942 libc_cv_pic_default=no
1943 fi
1944 rm -f conftest.*])
1945 AC_SUBST(libc_cv_pic_default)
1947 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1948 [libc_cv_pie_default=yes
1949 cat > conftest.c <<EOF
1950 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1951 # error PIE is default.
1952 #endif
1953 EOF
1954 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1955 libc_cv_pie_default=no
1956 fi
1957 rm -f conftest.*])
1958 AC_SUBST(libc_cv_pie_default)
1960 AC_SUBST(profile)
1961 AC_SUBST(static_nss)
1963 AC_SUBST(DEFINES)
1965 dnl See sysdeps/mach/configure.ac for this variable.
1966 AC_SUBST(mach_interface_list)
1968 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1969 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1970 AC_SUBST(VERSION)
1971 AC_SUBST(RELEASE)
1973 AC_CONFIG_FILES([config.make Makefile])
1974 AC_CONFIG_COMMANDS([default],[[
1975 case $CONFIG_FILES in *config.make*)
1976 echo "$config_vars" >> config.make;;
1977 esac
1978 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1979 AC_OUTPUT