| blob | 3c7f6c00963c8cecf2e91730b786f17b95ae235c |
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 $CXX can link programs], libc_cv_cxx_link_ok, [dnl
59 AC_LANG_PUSH([C++])
60 # Default, dynamic case.
61 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
62 [libc_cv_cxx_link_ok=yes],
63 [libc_cv_cxx_link_ok=no])
64 # Static case.
65 old_LDFLAGS="$LDFLAGS"
66 LDFLAGS="$LDFLAGS -static"
67 AC_LINK_IFELSE([AC_LANG_SOURCE([
68 #include <iostream>
70 int
71 main()
72 {
73 std::cout << "Hello, world!";
74 return 0;
75 }
76 ])],
77 [],
78 [libc_cv_cxx_link_ok=no])
79 LDFLAGS="$old_LDFLAGS"
80 AC_LANG_POP([C++])])
81 AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
83 if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
84 AC_MSG_ERROR([you must configure in a separate build directory])
85 fi
87 # This will get text that should go into config.make.
88 config_vars=
90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
91 AC_ARG_WITH([gd],
92 AC_HELP_STRING([--with-gd=DIR],
93 [find libgd include dir and library with prefix DIR]),
94 [dnl
95 case "$with_gd" in
96 yes|''|no) ;;
97 *) libgd_include="-I$withval/include"
98 libgd_ldflags="-L$withval/lib" ;;
99 esac
100 ])
101 AC_ARG_WITH([gd-include],
102 AC_HELP_STRING([--with-gd-include=DIR],
103 [find libgd include files in DIR]),
104 [dnl
105 case "$with_gd_include" in
106 ''|no) ;;
107 *) libgd_include="-I$withval" ;;
108 esac
109 ])
110 AC_ARG_WITH([gd-lib],
111 AC_HELP_STRING([--with-gd-lib=DIR],
112 [find libgd library files in DIR]),
113 [dnl
114 case "$with_gd_lib" in
115 ''|no) ;;
116 *) libgd_ldflags="-L$withval" ;;
117 esac
118 ])
120 if test -n "$libgd_include"; then
121 config_vars="$config_vars
122 CFLAGS-memusagestat.c = $libgd_include"
123 fi
124 if test -n "$libgd_ldflags"; then
125 config_vars="$config_vars
126 libgd-LDFLAGS = $libgd_ldflags"
127 fi
129 dnl Arguments to specify presence of other packages/features.
130 AC_ARG_WITH([fp],
131 AC_HELP_STRING([--with-fp],
132 [if using floating-point hardware @<:@default=yes@:>@]),
133 [with_fp=$withval],
134 [with_fp=yes])
135 AC_SUBST(with_fp)
136 AC_ARG_WITH([binutils],
137 AC_HELP_STRING([--with-binutils=PATH],
138 [specify location of binutils (as and ld)]),
139 [path_binutils=$withval],
140 [path_binutils=''])
141 AC_ARG_WITH([selinux],
142 AC_HELP_STRING([--with-selinux],
143 [if building with SELinux support]),
144 [with_selinux=$withval],
145 [with_selinux=auto])
147 AC_ARG_WITH([headers],
148 AC_HELP_STRING([--with-headers=PATH],
149 [location of system headers to use
150 (for example /usr/src/linux/include)
151 @<:@default=compiler default@:>@]),
152 [sysheaders=$withval],
153 [sysheaders=''])
154 AC_SUBST(sysheaders)
156 AC_SUBST(use_default_link)
157 AC_ARG_WITH([default-link],
158 AC_HELP_STRING([--with-default-link],
159 [do not use explicit linker scripts]),
160 [use_default_link=$withval],
161 [use_default_link=default])
163 AC_ARG_ENABLE([sanity-checks],
164 AC_HELP_STRING([--disable-sanity-checks],
165 [really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
166 [enable_sanity=$enableval],
167 [enable_sanity=yes])
169 AC_ARG_ENABLE([shared],
170 AC_HELP_STRING([--enable-shared],
171 [build shared library @<:@default=yes if GNU ld@:>@]),
172 [shared=$enableval],
173 [shared=yes])
174 AC_ARG_ENABLE([profile],
175 AC_HELP_STRING([--enable-profile],
176 [build profiled library @<:@default=no@:>@]),
177 [profile=$enableval],
178 [profile=no])
179 AC_ARG_ENABLE([timezone-tools],
180 AC_HELP_STRING([--disable-timezone-tools],
181 [do not install timezone tools @<:@default=install@:>@]),
182 [enable_timezone_tools=$enableval],
183 [enable_timezone_tools=yes])
184 AC_SUBST(enable_timezone_tools)
186 AC_ARG_ENABLE([hardcoded-path-in-tests],
187 AC_HELP_STRING([--enable-hardcoded-path-in-tests],
188 [hardcode newly built glibc path in tests @<:@default=no@:>@]),
189 [hardcoded_path_in_tests=$enableval],
190 [hardcoded_path_in_tests=no])
191 AC_SUBST(hardcoded_path_in_tests)
193 AC_ARG_ENABLE([stackguard-randomization],
194 AC_HELP_STRING([--enable-stackguard-randomization],
195 [initialize __stack_chk_guard canary with a random number at program start]),
196 [enable_stackguard_randomize=$enableval],
197 [enable_stackguard_randomize=no])
198 if test "$enable_stackguard_randomize" = yes; then
199 AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
200 fi
202 AC_ARG_ENABLE([lock-elision],
203 AC_HELP_STRING([--enable-lock-elision[=yes/no]],
204 [Enable lock elision for pthread mutexes by default]),
205 [enable_lock_elision=$enableval],
206 [enable_lock_elision=no])
207 AC_SUBST(enable_lock_elision)
208 if test "$enable_lock_elision" = yes ; then
209 AC_DEFINE(ENABLE_LOCK_ELISION)
210 fi
212 dnl Generic infrastructure for drop-in additions to libc.
213 AC_ARG_ENABLE([add-ons],
214 AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
215 [configure and build add-ons in DIR1,DIR2,...
216 search for add-ons if no parameter given]),
217 , [enable_add_ons=yes])
219 AC_ARG_ENABLE([hidden-plt],
220 AC_HELP_STRING([--disable-hidden-plt],
221 [do not hide internal function calls to avoid PLT]),
222 [hidden=$enableval],
223 [hidden=yes])
224 if test "x$hidden" = xno; then
225 AC_DEFINE(NO_HIDDEN)
226 fi
228 AC_ARG_ENABLE([bind-now],
229 AC_HELP_STRING([--enable-bind-now],
230 [disable lazy relocations in DSOs]),
231 [bindnow=$enableval],
232 [bindnow=no])
233 AC_SUBST(bindnow)
235 dnl On some platforms we cannot use dynamic loading. We must provide
236 dnl static NSS modules.
237 AC_ARG_ENABLE([static-nss],
238 AC_HELP_STRING([--enable-static-nss],
239 [build static NSS modules @<:@default=no@:>@]),
240 [static_nss=$enableval],
241 [static_nss=no])
242 dnl Enable static NSS also if we build no shared objects.
243 if test x"$static_nss" = xyes || test x"$shared" = xno; then
244 static_nss=yes
245 AC_DEFINE(DO_STATIC_NSS)
246 fi
248 AC_ARG_ENABLE([force-install],
249 AC_HELP_STRING([--disable-force-install],
250 [don't force installation of files from this package, even if they are older than the installed files]),
251 [force_install=$enableval],
252 [force_install=yes])
253 AC_SUBST(force_install)
255 AC_ARG_ENABLE([maintainer-mode],
256 AC_HELP_STRING([--enable-maintainer-mode],
257 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
258 [maintainer=$enableval],
259 [maintainer=no])
261 dnl On some platforms we allow dropping compatibility with all kernel
262 dnl versions.
263 AC_ARG_ENABLE([kernel],
264 AC_HELP_STRING([--enable-kernel=VERSION],
265 [compile for compatibility with kernel not older than VERSION]),
266 [minimum_kernel=$enableval],
267 [])
268 dnl Prevent unreasonable values.
269 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
270 # Better nothing than this.
271 minimum_kernel=""
272 else
273 if test "$minimum_kernel" = current; then
274 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
275 fi
276 fi
278 dnl For the development we sometimes want gcc to issue even more warnings.
279 dnl This is not the default since many of the extra warnings are not
280 dnl appropriate.
281 AC_ARG_ENABLE([all-warnings],
282 AC_HELP_STRING([--enable-all-warnings],
283 [enable all useful warnings gcc can issue]),
284 [all_warnings=$enableval],
285 [])
286 AC_SUBST(all_warnings)
288 AC_ARG_ENABLE([werror],
289 AC_HELP_STRING([--disable-werror],
290 [do not build with -Werror]),
291 [enable_werror=$enableval],
292 [enable_werror=yes])
293 AC_SUBST(enable_werror)
295 AC_ARG_ENABLE([multi-arch],
296 AC_HELP_STRING([--enable-multi-arch],
297 [enable single DSO with optimizations for multiple architectures]),
298 [multi_arch=$enableval],
299 [multi_arch=default])
301 AC_ARG_ENABLE([nss-crypt],
302 AC_HELP_STRING([--enable-nss-crypt],
303 [enable libcrypt to use nss]),
304 [nss_crypt=$enableval],
305 [nss_crypt=no])
306 if test x$nss_crypt = xyes; then
307 nss_includes=-I$(nss-config --includedir 2>/dev/null)
308 if test $? -ne 0; then
309 AC_MSG_ERROR([cannot find include directory with nss-config])
310 fi
311 old_CFLAGS="$CFLAGS"
312 CFLAGS="$CFLAGS $nss_includes"
313 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
314 #include <hasht.h>
315 #include <nsslowhash.h>
316 void f (void) { NSSLOW_Init (); }])],
317 libc_cv_nss_crypt=yes,
318 AC_MSG_ERROR([
319 cannot find NSS headers with lowlevel hash function interfaces]))
320 old_LIBS="$LIBS"
321 LIBS="$LIBS -lfreebl3"
322 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
323 #include <hasht.h>
324 #include <nsslowhash.h>],
325 [NSSLOW_Init();])],
326 libc_cv_nss_crypt=yes,
327 AC_MSG_ERROR([
328 cannot link program using lowlevel NSS hash functions]))
329 CFLAGS="$old_CFLAGS"
330 LIBS="$old_LIBS"
331 else
332 libc_cv_nss_crypt=no
333 fi
334 AC_SUBST(libc_cv_nss_crypt)
337 AC_ARG_ENABLE([obsolete-rpc],
338 AC_HELP_STRING([--enable-obsolete-rpc],
339 [build and install the obsolete RPC code for link-time usage]),
340 [link_obsolete_rpc=$enableval],
341 [link_obsolete_rpc=no])
342 AC_SUBST(link_obsolete_rpc)
344 if test "$link_obsolete_rpc" = yes; then
345 AC_DEFINE(LINK_OBSOLETE_RPC)
346 fi
348 AC_ARG_ENABLE([systemtap],
349 [AS_HELP_STRING([--enable-systemtap],
350 [enable systemtap static probe points @<:@default=no@:>@])],
351 [systemtap=$enableval],
352 [systemtap=no])
353 if test "x$systemtap" != xno; then
354 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
355 old_CFLAGS="$CFLAGS"
356 CFLAGS="-std=gnu99 $CFLAGS"
357 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
358 void foo (int i, void *p)
359 {
360 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
361 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
362 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
363 CFLAGS="$old_CFLAGS"])
364 if test $libc_cv_sdt = yes; then
365 AC_DEFINE([USE_STAP_PROBE])
366 elif test "x$systemtap" != xauto; then
367 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
368 fi
369 fi
371 AC_ARG_ENABLE([build-nscd],
372 [AS_HELP_STRING([--disable-build-nscd],
373 [disable building and installing the nscd daemon])],
374 [build_nscd=$enableval],
375 [build_nscd=default])
376 AC_SUBST(build_nscd)
378 # Note the use of $use_nscd is near the bottom of the file.
379 AC_ARG_ENABLE([nscd],
380 [AS_HELP_STRING([--disable-nscd],
381 [library functions will not contact the nscd daemon])],
382 [use_nscd=$enableval],
383 [use_nscd=yes])
385 AC_ARG_ENABLE([pt_chown],
386 [AS_HELP_STRING([--enable-pt_chown],
387 [Enable building and installing pt_chown])],
388 [build_pt_chown=$enableval],
389 [build_pt_chown=no])
390 AC_SUBST(build_pt_chown)
391 if test "$build_pt_chown" = yes; then
392 AC_DEFINE(HAVE_PT_CHOWN)
393 fi
395 # The abi-tags file uses a fairly simplistic model for name recognition that
396 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
397 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
398 # This doesn't get used much beyond that, so it's fairly safe.
399 case "$host_os" in
400 linux*)
401 ;;
402 gnu*)
403 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
404 ;;
405 esac
407 AC_ARG_ENABLE([mathvec],
408 [AS_HELP_STRING([--enable-mathvec],
409 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
410 [build_mathvec=$enableval],
411 [build_mathvec=notset])
413 # We keep the original values in `$config_*' and never modify them, so we
414 # can write them unchanged into config.make. Everything else uses
415 # $machine, $vendor, and $os, and changes them whenever convenient.
416 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
418 # Don't allow vendor == "unknown"
419 test "$config_vendor" = unknown && config_vendor=
420 config_os="`echo $config_os | sed 's/^unknown-//'`"
422 # Some configurations imply other options.
423 elf=yes
425 # The configure fragment of an add-on port can modify these to supplement
426 # or override the table in the case statement below. No fragment should
427 # ever change the config_* variables, however.
428 machine=$config_machine
429 vendor=$config_vendor
430 os=$config_os
431 base_os=''
433 submachine=
434 AC_ARG_WITH([cpu],
435 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
436 [dnl
437 case "$withval" in
438 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
439 no) ;;
440 *) submachine="$withval" ;;
441 esac
442 ])
444 # An preconfigure script can set this when it wants to disable the sanity
445 # check below.
446 libc_config_ok=no
448 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
449 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
451 dnl Having this here, though empty, makes sure that if add-ons' fragments
452 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
453 dnl our AC_OUTPUT will actually use it.
454 AC_CONFIG_SUBDIRS()
456 case "$enable_add_ons" in
457 ''|no) add_ons= ;;
458 yes|'*')
459 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
460 sed 's@/[[^/]]*$@@' | sort | uniq`
461 add_ons_automatic=yes
462 ;;
463 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
464 add_ons_automatic=no ;;
465 esac
467 configured_add_ons=
468 add_ons_sfx=
469 add_ons_pfx=
470 if test x"$add_ons" != x; then
471 for f in $add_ons; do
472 # Some sanity checks
473 case "$f" in
474 crypt)
475 AC_MSG_ERROR([
476 *** It seems that you're using an old \`crypt' add-on. crypt is now
477 *** part of glibc and using the old add-on will not work with this
478 *** release. Start again with fresh sources and without the old
479 *** \`crypt' add-on.])
480 ;;
481 localedata)
482 AC_MSG_ERROR([
483 *** It seems that you're using an old \`localedata' add-on. localedata
484 *** is now part of glibc and using the old add-on will not work with
485 *** this release. Start again with fresh sources and without the old
486 *** \`localedata' add-on.])
487 ;;
488 esac
489 done
491 # Now source each add-on's configure fragment.
492 # The fragments can use $srcdir/$libc_add_on to find themselves,
493 # and test $add_ons_automatic to see if they were explicitly requested.
494 # A fragment can clear (or even change) $libc_add_on to affect
495 # whether it goes into the list to be actually used in the build.
496 use_add_ons=
497 for libc_add_on in $add_ons; do
498 # Test whether such a directory really exists.
499 # It can be absolute, or relative to $srcdir, or relative to the build dir.
500 case "$libc_add_on" in
501 /*)
502 libc_add_on_srcdir=$libc_add_on
503 ;;
504 *)
505 test -d "$srcdir/$libc_add_on" || {
506 if test -d "$libc_add_on"; then
507 libc_add_on="`pwd`/$libc_add_on"
508 else
509 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
510 fi
511 }
512 libc_add_on_srcdir=$srcdir/$libc_add_on
513 ;;
514 esac
516 libc_add_on_frag=$libc_add_on_srcdir/configure
517 libc_add_on_canonical=
518 libc_add_on_config_subdirs=
519 if test -r "$libc_add_on_frag"; then
520 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
521 libc_add_on_canonical=unknown
522 libc_add_on_subdirs=
523 . "$libc_add_on_frag"
524 test -z "$libc_add_on" || {
525 configured_add_ons="$configured_add_ons $libc_add_on"
526 if test "x$libc_add_on_canonical" = xunknown; then
527 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
528 fi
529 for d in $libc_add_on_subdirs; do
530 case "$libc_add_on" in
531 /*) subdir_srcdir="$libc_add_on" ;;
532 *) subdir_srcdir="\$(..)$libc_add_on" ;;
533 esac
534 case "$d" in
535 .)
536 d="${libc_add_on_canonical:-$libc_add_on}"
537 ;;
538 /*)
539 subdir_srcdir="$d"
540 ;;
541 *)
542 subdir_srcdir="$subdir_srcdir/$d"
543 ;;
544 esac
545 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
546 add_on_subdirs="$add_on_subdirs $d"
547 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
548 $d-srcdir = $subdir_srcdir"
549 done
550 for d in $libc_add_on_config_subdirs; do
551 case "$d" in
552 /*) AC_MSG_ERROR(dnl
553 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
554 esac
555 if test ! -d "$libc_add_on_srcdir/$d"; then
556 AC_MSG_ERROR(fragment wants to configure missing directory $d)
557 fi
558 case "$libc_add_on" in
559 /*) AC_MSG_ERROR(dnl
560 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
561 esac
562 subdirs="$subdirs $libc_add_on/$d"
563 done
564 }
565 fi
566 if test -n "$libc_add_on"; then
567 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
568 use_add_ons="$use_add_ons $libc_add_on"
569 add_ons_pfx="$add_ons_pfx $libc_add_on/"
570 test -z "$libc_add_on_canonical" ||
571 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
572 fi
573 done
574 # Use echo to strip excess whitespace.
575 add_ons="`echo $use_add_ons`"
576 fi
577 AC_SUBST(add_ons)
578 AC_SUBST(add_on_subdirs)
581 ###
582 ### I put this here to prevent those annoying emails from people who cannot
583 ### read and try to compile glibc on unsupported platforms. --drepper
584 ###
585 ### By using the undocumented --enable-hacker-mode option for configure
586 ### one can skip this test to make the configuration not fail for unsupported
587 ### platforms.
588 ###
589 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
590 case "$machine-$host_os" in
591 *-linux* | *-gnu*)
592 ;;
593 *)
594 echo "*** The GNU C library is currently not available for this platform."
595 echo "*** So far nobody cared to port it and if there is no volunteer it"
596 echo "*** might never happen. So, if you have interest to see glibc on"
597 echo "*** this platform visit"
598 echo "*** http://www.gnu.org/software/libc/porting.html"
599 echo "*** and join the group of porters"
600 exit 1
601 ;;
602 esac
603 fi
605 # Set base_machine if not set by a preconfigure fragment.
606 test -n "$base_machine" || base_machine=$machine
607 AC_SUBST(base_machine)
609 # For the multi-arch option we need support in the assembler & linker.
610 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
611 libc_cv_ld_gnu_indirect_function, [dnl
612 cat > conftest.S <<EOF
613 .type foo,%gnu_indirect_function
614 foo:
615 .globl _start
616 _start:
617 .globl __start
618 __start:
619 .data
620 #ifdef _LP64
621 .quad foo
622 #else
623 .long foo
624 #endif
625 EOF
626 libc_cv_ld_gnu_indirect_function=no
627 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
628 -nostartfiles -nostdlib \
629 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
630 # Do a link to see if the backend supports IFUNC relocs.
631 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
632 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
633 libc_cv_ld_gnu_indirect_function=yes
634 }
635 fi
636 rm -f conftest*])
638 AC_MSG_CHECKING(whether .text pseudo-op must be used)
639 AC_CACHE_VAL(libc_cv_dot_text, [dnl
640 cat > conftest.s <<EOF
641 .text
642 EOF
643 libc_cv_dot_text=
644 if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
645 libc_cv_dot_text=.text
646 fi
647 rm -f conftest*])
648 if test -z "$libc_cv_dot_text"; then
649 AC_MSG_RESULT(no)
650 else
651 AC_MSG_RESULT(yes)
652 fi
654 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
655 if test x"$multi_arch" = xyes; then
656 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
657 else
658 multi_arch=no
659 fi
660 fi
661 multi_arch_d=
662 if test x"$multi_arch" != xno; then
663 multi_arch_d=/multiarch
664 fi
666 # Compute the list of sysdep directories for this configuration.
667 # This can take a while to compute.
668 sysdep_dir=$srcdir/sysdeps
669 AC_MSG_CHECKING(sysdep dirs)
670 dnl We need to use [ and ] for other purposes for a while now.
671 changequote(,)dnl
672 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
673 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
675 test "x$base_os" != x || case "$os" in
676 gnu*)
677 base_os=mach/hurd ;;
678 linux*)
679 base_os=unix/sysv ;;
680 esac
682 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
683 tail=$os
684 ostry=$os
685 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
686 ostry="$ostry /$o"
687 tail=$o
688 done
689 o=`echo $tail | sed 's/[0-9]*$//'`
690 if test $o != $tail; then
691 ostry="$ostry /$o"
692 fi
693 # For linux-gnu, try linux-gnu, then linux.
694 o=`echo $tail | sed 's/-.*$//'`
695 if test $o != $tail; then
696 ostry="$ostry /$o"
697 fi
699 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
700 base=
701 tail=$base_os
702 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
703 set $b
704 base="$base /$1"
705 tail="$2"
706 done
708 # For sparc/sparc32, try sparc/sparc32 and then sparc.
709 mach=
710 tail=$machine${submachine:+/$submachine}
711 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
712 set $m
713 # Prepend the machine's FPU directory unless --without-fp.
714 if test "$with_fp" = yes; then
715 maybe_fpu=/fpu
716 else
717 maybe_fpu=/nofpu
718 fi
719 # For each machine term, try it with and then without /multiarch.
720 for try_fpu in $maybe_fpu ''; do
721 for try_multi in $multi_arch_d ''; do
722 mach="$mach /$1$try_fpu$try_multi"
723 done
724 done
725 tail="$2"
726 done
728 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
729 changequote([,])dnl
731 # Find what sysdep directories exist.
732 sysnames_add_ons=
733 sysnames=
734 for b in $base ''; do
735 for m0 in $mach ''; do
736 for v in /$vendor ''; do
737 test "$v" = / && continue
738 for o in /$ostry ''; do
739 test "$o" = / && continue
740 for m in $mach ''; do
741 for d in $add_ons_pfx ''; do
742 for a in $add_ons_sfx ''; do
743 try_suffix="$m0$b$v$o$m"
744 if test -n "$try_suffix"; then
745 try_srcdir="${srcdir}/"
746 case "$d" in
747 /*) try_srcdir= ;;
748 esac
749 try="${d}sysdeps$try_suffix$a"
750 test -n "$enable_debug_configure" &&
751 echo "$0 [DEBUG]: try $try" >&2
752 if test -d "$try_srcdir$try"; then
753 sysnames="$sysnames $try"
754 { test -n "$o" || test -n "$b"; } && os_used=t
755 { test -n "$m" || test -n "$m0"; } && machine_used=t
756 case x${m0:-$m} in
757 x*/$submachine) submachine_used=t ;;
758 esac
759 if test -n "$d"; then
760 case "$sysnames_add_ons" in
761 *" $d "*) ;;
762 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
763 esac
764 fi
765 fi
766 fi
767 done
768 done
769 done
770 done
771 done
772 done
773 done
775 # If the assembler supports gnu_indirect_function symbol type and the
776 # architecture supports multi-arch, we enable multi-arch by default.
777 case $sysnames_add_ons$sysnames in
778 *"$multi_arch_d"*)
779 ;;
780 *)
781 test x"$multi_arch" = xdefault && multi_arch=no
782 ;;
783 esac
784 if test x"$multi_arch" != xno; then
785 AC_DEFINE(USE_MULTIARCH)
786 fi
787 AC_SUBST(multi_arch)
789 if test -z "$os_used" && test "$os" != none; then
790 AC_MSG_ERROR(Operating system $os is not supported.)
791 fi
792 if test -z "$machine_used" && test "$machine" != none; then
793 AC_MSG_ERROR(The $machine is not supported.)
794 fi
795 if test -z "$submachine_used" && test -n "$submachine"; then
796 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
797 fi
798 AC_SUBST(submachine)
800 # We have now validated the configuration.
802 # Expand the list of system names into a full list of directories
803 # from each element's parent name and Implies file (if present).
804 set $sysnames
805 names=
806 while test $# -gt 0; do
807 name=$1
808 shift
810 case " $names " in *" $name "*)
811 # Already in the list.
812 continue
813 esac
815 # Report each name as we discover it, so there is no long pause in output.
816 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
818 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
820 case $name in
821 /*) xsrcdir= ;;
822 *) xsrcdir=$srcdir/ ;;
823 esac
824 test -n "$enable_debug_configure" &&
825 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
827 for implies_file in Implies Implies-before Implies-after; do
828 implies_type=`echo $implies_file | sed s/-/_/`
829 eval ${implies_type}=
830 if test -f $xsrcdir$name/$implies_file; then
831 # Collect more names from the `Implies' file (removing comments).
832 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
833 for x in $implied_candidate; do
834 found=no
835 if test -d $xsrcdir$name_base/$x; then
836 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
837 found=yes
838 fi
839 for d in $add_ons_pfx ''; do
840 try="${d}sysdeps/$x"
841 case $d in
842 /*) try_srcdir= ;;
843 *) try_srcdir=$srcdir/ ;;
844 esac
845 test -n "$enable_debug_configure" &&
846 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
847 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
848 then
849 eval "${implies_type}=\"\$${implies_type} \$try\""
850 found=yes
851 case "$sysnames_add_ons" in
852 *" $d "*) ;;
853 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
854 esac
855 fi
856 done
857 if test $found = no; then
858 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
859 fi
860 done
861 fi
862 done
864 # Add NAME to the list of names.
865 names="$names $name"
867 # Find the parent of NAME, using the empty string if it has none.
868 changequote(,)dnl
869 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
870 changequote([,])dnl
872 test -n "$enable_debug_configure" &&
873 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
874 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
876 # Add the names implied by NAME, and NAME's parent (if it has one), to
877 # the list of names to be processed (the argument list). We prepend the
878 # implied names to the list and append the parent. We want implied
879 # directories to come before further directories inferred from the
880 # configuration components; this ensures that for sysv4, unix/common
881 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
882 # after sysv4).
883 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
884 test -n "$sysnames" && set $sysnames
885 done
887 # Add the default directories.
888 default_sysnames="sysdeps/generic"
889 sysnames="$names $default_sysnames"
890 AC_SUBST(sysnames)
891 # The other names were emitted during the scan.
892 AC_MSG_RESULT($default_sysnames)
894 # Collect the list of add-ons that supply partial sysdeps trees.
895 sysdeps_add_ons=
896 for add_on in $add_ons; do
897 case "$add_on" in
898 /*) xsrcdir= ;;
899 *) xsrcdir="$srcdir/" ;;
900 esac
902 test -d "$xsrcdir$add_on/sysdeps" || {
903 case "$configured_add_ons " in
904 *" $add_on "*) ;;
905 *|'')
906 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
907 ;;
908 esac
909 continue
910 }
912 sysdeps_add_ons="$sysdeps_add_ons $add_on"
913 case "$sysnames_add_ons" in
914 *" $add_on/ "*) ;;
915 *|'')
916 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
917 continue ;;
918 esac
920 found=no
921 for d in $sysnames; do
922 case "$d" in
923 $add_on/sysdeps/*) ;;
924 *) continue ;;
925 esac
926 (cd "$xsrcdir$d" && for f in *[[!~]]; do
927 case "$f" in
928 sys|bits)
929 for ff in $f/*.h; do
930 test -d "$ff" || { test -e "$ff" && exit 88; }
931 done
932 ;;
933 *)
934 test -d "$f" || { test -e "$f" && exit 88; }
935 ;;
936 esac
937 done)
938 if test $? -eq 88; then
939 found=yes
940 break
941 fi
942 done
943 if test $found = no; then
944 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
945 fi
946 done
947 AC_SUBST(sysdeps_add_ons)
950 ### Locate tools.
952 AC_PROG_INSTALL
953 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
954 # The makefiles need to use a different form to find it in $srcdir.
955 INSTALL='\$(..)./scripts/install-sh -c'
956 fi
957 AC_PROG_LN_S
959 LIBC_PROG_BINUTILS
961 # Accept binutils 2.22 or newer.
962 AC_CHECK_PROG_VER(AS, $AS, --version,
963 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
964 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
965 AS=: critic_missing="$critic_missing as")
966 AC_CHECK_PROG_VER(LD, $LD, --version,
967 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
968 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
969 LD=: critic_missing="$critic_missing ld")
971 # These programs are version sensitive.
972 AC_CHECK_TOOL_PREFIX
973 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
974 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
975 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
977 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
978 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
979 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
980 MSGFMT=: aux_missing="$aux_missing msgfmt")
981 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
982 [GNU texinfo.* \([0-9][0-9.]*\)],
983 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
984 MAKEINFO=: aux_missing="$aux_missing makeinfo")
985 AC_CHECK_PROG_VER(SED, sed, --version,
986 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
987 [3.0[2-9]*|3.[1-9]*|[4-9]*],
988 SED=: aux_missing="$aux_missing sed")
989 AC_CHECK_PROG_VER(AWK, gawk, --version,
990 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
991 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
993 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
994 AC_TRY_COMPILE([], [
995 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
996 #error insufficient compiler
997 #endif],
998 [libc_cv_compiler_ok=yes],
999 [libc_cv_compiler_ok=no])])
1000 AS_IF([test $libc_cv_compiler_ok != yes],
1001 [critic_missing="$critic_missing compiler"])
1003 AC_CHECK_TOOL(NM, nm, false)
1005 if test "x$maintainer" = "xyes"; then
1006 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1007 case "x$AUTOCONF" in
1008 xno|x|x:) AUTOCONF=no ;;
1009 *)
1010 AC_CACHE_CHECK(dnl
1011 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1012 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1013 libc_cv_autoconf_works=yes
1014 else
1015 libc_cv_autoconf_works=no
1016 fi])
1017 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1018 ;;
1019 esac
1020 if test "x$AUTOCONF" = xno; then
1021 aux_missing="$aux_missing autoconf"
1022 fi
1023 else
1024 AUTOCONF=no
1025 fi
1027 test -n "$critic_missing" && AC_MSG_ERROR([
1028 *** These critical programs are missing or too old:$critic_missing
1029 *** Check the INSTALL file for required versions.])
1031 test -n "$aux_missing" && AC_MSG_WARN([
1032 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1033 *** some features will be disabled.
1034 *** Check the INSTALL file for required versions.])
1036 # if using special system headers, find out the compiler's sekrit
1037 # header directory and add that to the list. NOTE: Only does the right
1038 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1039 if test -n "$sysheaders"; then
1040 SYSINCLUDES=-nostdinc
1041 for d in include include-fixed; do
1042 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1043 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1044 done
1045 SYSINCLUDES="$SYSINCLUDES \
1046 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1047 if test -n "$CXX"; then
1048 CXX_SYSINCLUDES=
1049 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1050 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1051 test "x$cxxheaders" != x &&
1052 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1053 done
1054 fi
1055 fi
1056 AC_SUBST(SYSINCLUDES)
1057 AC_SUBST(CXX_SYSINCLUDES)
1059 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1060 # since this would lead to problems installing/building glibc.
1061 # LD_LIBRARY_PATH contains the current directory if one of the following
1062 # is true:
1063 # - one of the terminals (":" and ";") is the first or last sign
1064 # - two terminals occur directly after each other
1065 # - the path contains an element with a dot in it
1066 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1067 changequote(,)dnl
1068 case ${LD_LIBRARY_PATH} in
1069 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1070 ld_library_path_setting="contains current directory"
1071 ;;
1072 *)
1073 ld_library_path_setting="ok"
1074 ;;
1075 esac
1076 changequote([,])dnl
1077 AC_MSG_RESULT($ld_library_path_setting)
1078 if test "$ld_library_path_setting" != "ok"; then
1079 AC_MSG_ERROR([
1080 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1081 *** building glibc. Please change the environment variable
1082 *** and run configure again.])
1083 fi
1085 AC_PATH_PROG(BASH_SHELL, bash, no)
1087 AC_PATH_PROG(PERL, perl, no)
1088 if test "$PERL" != no &&
1089 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1090 PERL=no
1091 fi
1092 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1093 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1094 AC_CHECK_PROG_VER(BISON, bison, --version,
1095 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1096 [2.7*|[3-9].*|[1-9][0-9]*],
1097 BISON=no)
1099 AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
1100 libc_cv_need_minus_P, [dnl
1101 cat > conftest.S <<EOF
1102 #include "confdefs.h"
1103 /* Nothing whatsoever. */
1104 EOF
1105 if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
1106 libc_cv_need_minus_P=no
1107 else
1108 libc_cv_need_minus_P=yes
1109 fi
1110 rm -f conftest*])
1111 if test $libc_cv_need_minus_P = yes; then
1112 config_vars="$config_vars
1113 asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
1114 fi
1116 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1117 cat > conftest.s <<EOF
1118 ${libc_cv_dot_text}
1119 foo:
1120 .set glibc_conftest_frobozz,foo
1121 .globl glibc_conftest_frobozz
1122 EOF
1123 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1124 # (but it doesn't work), so we must do a linking check to be sure.
1125 cat > conftest1.c <<\EOF
1126 extern int glibc_conftest_frobozz;
1127 void _start() { glibc_conftest_frobozz = 1; }
1128 EOF
1129 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1130 -nostartfiles -nostdlib \
1131 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1132 libc_cv_asm_set_directive=yes
1133 else
1134 libc_cv_asm_set_directive=no
1135 fi
1136 rm -f conftest*])
1137 if test $libc_cv_asm_set_directive = yes; then
1138 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1139 fi
1141 AC_CACHE_CHECK(for .protected and .hidden assembler directive,
1142 libc_cv_asm_protected_directive, [dnl
1143 cat > conftest.s <<EOF
1144 .protected foo
1145 foo:
1146 .hidden bar
1147 bar:
1148 EOF
1149 if AC_TRY_COMMAND(${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 $libc_cv_cc_with_libunwind = yes; then
1324 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1325 fi
1327 LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
1328 [libc_cv_z_nodelete=yes],
1329 [AC_MSG_ERROR(linker with -z nodelete support required)])
1331 LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
1332 [libc_cv_z_nodlopen=yes],
1333 [AC_MSG_ERROR(linker with -z nodlopen support required)])
1335 LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
1336 [libc_cv_z_initfirst=yes],
1337 [AC_MSG_ERROR(linker with -z initfirst support required)])
1339 ASFLAGS_config=
1340 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1341 libc_cv_as_noexecstack, [dnl
1342 cat > conftest.c <<EOF
1343 void foo (void) { }
1344 EOF
1345 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1346 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1347 && grep .note.GNU-stack conftest.s >/dev/null \
1348 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1349 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1350 then
1351 libc_cv_as_noexecstack=yes
1352 else
1353 libc_cv_as_noexecstack=no
1354 fi
1355 rm -f conftest*])
1356 if test $libc_cv_as_noexecstack = yes; then
1357 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1358 fi
1359 AC_SUBST(ASFLAGS_config)
1361 AC_CACHE_CHECK(for -z combreloc,
1362 libc_cv_z_combreloc, [dnl
1363 cat > conftest.c <<EOF
1364 extern int bar (int);
1365 extern int mumble;
1366 int foo (void) { return bar (mumble); }
1367 EOF
1368 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1369 -fPIC -shared -o conftest.so conftest.c
1370 -nostdlib -nostartfiles
1371 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1372 then
1373 dnl The following test is a bit weak. We must use a tool which can test
1374 dnl cross-platform since the gcc used can be a cross compiler. Without
1375 dnl introducing new options this is not easily doable. Instead use a tool
1376 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1377 dnl look for a section named .rel.dyn.
1378 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1379 libc_cv_z_combreloc=yes
1380 else
1381 libc_cv_z_combreloc=no
1382 fi
1383 else
1384 libc_cv_z_combreloc=no
1385 fi
1386 rm -f conftest*])
1387 if test "$libc_cv_z_combreloc" = yes; then
1388 AC_DEFINE(HAVE_Z_COMBRELOC)
1389 fi
1390 AC_SUBST(libc_cv_z_combreloc)
1392 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1393 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1394 AC_SUBST(libc_cv_z_execstack)
1396 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1397 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1398 ])
1400 AC_SUBST(libc_cv_fpie)
1402 AC_CACHE_CHECK(for --hash-style option,
1403 libc_cv_hashstyle, [dnl
1404 cat > conftest.c <<EOF
1405 int _start (void) { return 42; }
1406 EOF
1407 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1408 -fPIC -shared -o conftest.so conftest.c
1409 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1410 then
1411 libc_cv_hashstyle=yes
1412 else
1413 libc_cv_hashstyle=no
1414 fi
1415 rm -f conftest*])
1416 AC_SUBST(libc_cv_hashstyle)
1418 # The linker's default -shared behavior is good enough if it
1419 # does these things that our custom linker scripts ensure that
1420 # all allocated NOTE sections come first.
1421 if test "$use_default_link" = default; then
1422 AC_CACHE_CHECK([for sufficient default -shared layout],
1423 libc_cv_use_default_link, [dnl
1424 libc_cv_use_default_link=no
1425 cat > conftest.s <<\EOF
1426 .section .note.a,"a",%note
1427 .balign 4
1428 .long 4,4,9
1429 .string "GNU"
1430 .string "foo"
1431 .section .note.b,"a",%note
1432 .balign 4
1433 .long 4,4,9
1434 .string "GNU"
1435 .string "bar"
1436 EOF
1437 if AC_TRY_COMMAND([dnl
1438 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1439 ac_try=`$READELF -S conftest.so | sed -n \
1440 ['${x;p;}
1441 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1442 t a
1443 b
1444 : a
1445 H']`
1446 then
1447 libc_seen_a=no libc_seen_b=no
1448 set -- $ac_try
1449 while test $# -ge 2 -a "$1" = NOTE; do
1450 case "$2" in
1451 .note.a) libc_seen_a=yes ;;
1452 .note.b) libc_seen_b=yes ;;
1453 esac
1454 shift 2
1455 done
1456 case "$libc_seen_a$libc_seen_b" in
1457 yesyes)
1458 libc_cv_use_default_link=yes
1459 ;;
1460 *)
1461 echo >&AS_MESSAGE_LOG_FD "\
1462 $libc_seen_a$libc_seen_b from:
1463 $ac_try"
1464 ;;
1465 esac
1466 fi
1467 rm -f conftest*])
1468 use_default_link=$libc_cv_use_default_link
1469 fi
1471 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1472 if libc_cv_output_format=`
1473 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1474 then
1475 :
1476 else
1477 libc_cv_output_format=
1478 fi
1479 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1480 AC_SUBST(libc_cv_output_format)
1482 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1483 cat > conftest.c <<EOF
1484 int foo;
1485 EOF
1486 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1487 conftest.c 1>&AS_MESSAGE_LOG_FD])
1488 then
1489 libc_cv_fno_toplevel_reorder=yes
1490 else
1491 libc_cv_fno_toplevel_reorder=no
1492 fi
1493 rm -f conftest*])
1494 if test $libc_cv_fno_toplevel_reorder = yes; then
1495 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1496 else
1497 fno_unit_at_a_time=-fno-unit-at-a-time
1498 fi
1499 AC_SUBST(fno_unit_at_a_time)
1501 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1502 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1503 [libc_cv_ssp=yes],
1504 [libc_cv_ssp=no])
1505 ])
1507 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
1508 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
1509 [libc_cv_ssp_strong=yes],
1510 [libc_cv_ssp_strong=no])
1511 ])
1513 stack_protector=
1514 if test "$libc_cv_ssp_strong" = "yes"; then
1515 stack_protector="-fstack-protector-strong"
1516 elif test "$libc_cv_ssp" = "yes"; then
1517 stack_protector="-fstack-protector"
1518 fi
1519 AC_SUBST(stack_protector)
1521 AC_CACHE_CHECK(whether cc puts quotes around section names,
1522 libc_cv_have_section_quotes,
1523 [cat > conftest.c <<EOF
1524 static const int foo
1525 __attribute__ ((section ("bar"))) = 1;
1526 EOF
1527 if ${CC-cc} -S conftest.c -o conftest.s; then
1528 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1529 libc_cv_have_section_quotes=yes
1530 else
1531 libc_cv_have_section_quotes=no
1532 fi
1533 else
1534 libc_cv_have_section_quotes=unknown
1535 fi
1536 rm -f conftest.{c,s}
1537 ])
1538 if test $libc_cv_have_section_quotes = yes; then
1539 AC_DEFINE(HAVE_SECTION_QUOTES)
1540 fi
1542 AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
1543 cat > conftest.c <<\EOF
1544 _start () {}
1545 int __eh_pc;
1546 __throw () {}
1547 EOF
1548 dnl No \ in command here because it ends up inside ''.
1549 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1550 -nostdlib -nostartfiles -Wl,--no-whole-archive
1551 -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
1552 libc_cv_ld_no_whole_archive=yes
1553 else
1554 libc_cv_ld_no_whole_archive=no
1555 fi
1556 rm -f conftest*])
1557 if test $libc_cv_ld_no_whole_archive = no; then
1558 AC_MSG_ERROR([support for --no-whole-archive is needed])
1559 fi
1561 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1562 cat > conftest.c <<\EOF
1563 void zero (void *x)
1564 {
1565 __builtin_memset (x, 0, 1000);
1566 }
1567 EOF
1568 dnl
1569 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1570 then
1571 libc_cv_gcc_builtin_memset=no
1572 else
1573 libc_cv_gcc_builtin_memset=yes
1574 fi
1575 rm -f conftest* ])
1576 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1577 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1578 fi
1580 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1581 cat > conftest.c <<\EOF
1582 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1583 char *foo (const char *a, const char *b)
1584 {
1585 return __builtin_strstr (a, b);
1586 }
1587 EOF
1588 dnl
1589 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1590 then
1591 libc_cv_gcc_builtin_redirection=yes
1592 else
1593 libc_cv_gcc_builtin_redirection=no
1594 fi
1595 rm -f conftest* ])
1596 if test "$libc_cv_gcc_builtin_redirection" = no; then
1597 AC_MSG_ERROR([support for the symbol redirection needed])
1598 fi
1600 dnl Check whether the compiler supports the __thread keyword.
1601 AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
1602 [cat > conftest.c <<\EOF
1603 __thread int a = 42;
1604 EOF
1605 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
1606 libc_cv_gcc___thread=yes
1607 else
1608 libc_cv_gcc___thread=no
1609 fi
1610 rm -f conftest*])
1611 if test "$libc_cv_gcc___thread" = no; then
1612 AC_MSG_ERROR([support for the __thread keyword is required])
1613 fi
1615 dnl Check whether the compiler supports the tls_model attribute.
1616 AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
1617 cat > conftest.c <<\EOF
1618 extern __thread int a __attribute__((tls_model ("initial-exec")));
1619 EOF
1620 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
1621 libc_cv_gcc_tls_model_attr=yes
1622 else
1623 libc_cv_gcc_tls_model_attr=no
1624 fi
1625 rm -f conftest*])
1626 if test "$libc_cv_gcc_tls_model_attr" = no; then
1627 AC_MSG_ERROR([support for the tls_model attribute is required])
1628 fi
1630 dnl Determine how to disable generation of FMA instructions.
1631 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1632 libc_cv_cc_nofma, [dnl
1633 libc_cv_cc_nofma=
1634 for opt in -ffp-contract=off -mno-fused-madd; do
1635 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1636 done])
1637 AC_SUBST(libc_cv_cc_nofma)
1639 if test -n "$submachine"; then
1640 AC_CACHE_CHECK([for compiler option for CPU variant],
1641 libc_cv_cc_submachine, [dnl
1642 libc_cv_cc_submachine=no
1643 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1644 LIBC_TRY_CC_OPTION([$opt], [
1645 libc_cv_cc_submachine="$opt"
1646 break], [])
1647 done])
1648 if test "x$libc_cv_cc_submachine" = xno; then
1649 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1650 fi
1651 fi
1652 AC_SUBST(libc_cv_cc_submachine)
1654 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1655 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1656 cat > conftest.c <<EOF
1657 void
1658 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1659 foo (void) {}
1660 EOF
1661 libc_cv_cc_loop_to_function=no
1662 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1663 then
1664 libc_cv_cc_loop_to_function=yes
1665 fi
1666 rm -f conftest*])
1667 if test $libc_cv_cc_loop_to_function = yes; then
1668 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1669 fi
1670 AC_SUBST(libc_cv_cc_loop_to_function)
1672 dnl Check whether we have the gd library available.
1673 AC_MSG_CHECKING(for libgd)
1674 if test "$with_gd" != "no"; then
1675 old_CFLAGS="$CFLAGS"
1676 CFLAGS="$CFLAGS $libgd_include"
1677 old_LDFLAGS="$LDFLAGS"
1678 LDFLAGS="$LDFLAGS $libgd_ldflags"
1679 old_LIBS="$LIBS"
1680 LIBS="$LIBS -lgd -lpng -lz -lm"
1681 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1682 CFLAGS="$old_CFLAGS"
1683 LDFLAGS="$old_LDFLAGS"
1684 LIBS="$old_LIBS"
1685 else
1686 LIBGD=no
1687 fi
1688 AC_MSG_RESULT($LIBGD)
1689 AC_SUBST(LIBGD)
1691 # SELinux detection
1692 if test x$with_selinux = xno ; then
1693 have_selinux=no;
1694 else
1695 # See if we have the SELinux library
1696 AC_CHECK_LIB(selinux, is_selinux_enabled,
1697 have_selinux=yes, have_selinux=no)
1698 if test x$with_selinux = xyes ; then
1699 if test x$have_selinux = xno ; then
1700 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1701 fi
1702 fi
1703 fi
1704 # Check if we're building with SELinux support.
1705 if test "x$have_selinux" = xyes; then
1706 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1708 # See if we have the libaudit library
1709 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1710 have_libaudit=yes, have_libaudit=no)
1711 if test "x$have_libaudit" = xyes; then
1712 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1713 fi
1714 AC_SUBST(have_libaudit)
1716 # See if we have the libcap library
1717 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1718 if test "x$have_libcap" = xyes; then
1719 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1720 fi
1721 AC_SUBST(have_libcap)
1722 fi
1723 AC_SUBST(have_selinux)
1725 CPPUNDEFS=
1726 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1727 dnl Since we are building the implementations of the fortified functions here,
1728 dnl having the macro defined interacts very badly.
1729 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1730 [AC_TRY_COMPILE([], [
1731 #ifdef _FORTIFY_SOURCE
1732 # error bogon
1733 #endif],
1734 [libc_cv_predef_fortify_source=no],
1735 [libc_cv_predef_fortify_source=yes])])
1736 if test $libc_cv_predef_fortify_source = yes; then
1737 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1738 fi
1739 AC_SUBST(CPPUNDEFS)
1741 dnl Check for silly hacked compilers inserting -fstack-protector.
1742 dnl This breaks badly for the early startup code we compile, since
1743 dnl the compiled code can refer to a magic machine-dependent location
1744 dnl for the canary value before we have sufficient setup for that to
1745 dnl work. It's also questionable to build all of libc with this flag
1746 dnl even when you're doing that for most applications you build, since
1747 dnl libc's code is so heavily-used and performance-sensitive. If we
1748 dnl ever really want to make that work, it should be enabled explicitly
1749 dnl in the libc build, not inherited from implicit compiler settings.
1750 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1751 libc_cv_predef_stack_protector, [
1752 AC_TRY_COMPILE([extern void foobar (char *);],
1753 [char large_array[2048]; foobar (large_array);], [
1754 libc_undefs=`$NM -u conftest.o |
1755 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1756 2>&AS_MESSAGE_LOG_FD` || {
1757 AC_MSG_ERROR([confusing output from $NM -u])
1758 }
1759 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1760 # On some architectures, there are architecture-specific undefined
1761 # symbols (resolved by the linker), so filter out unknown symbols.
1762 # This will fail to produce the correct result if the compiler
1763 # defaults to -fstack-protector but this produces an undefined symbol
1764 # other than __stack_chk_fail. However, compilers like that have not
1765 # been encountered in practice.
1766 libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
1767 case "$libc_undefs" in
1768 foobar) libc_cv_predef_stack_protector=no ;;
1769 '__stack_chk_fail
1770 foobar') libc_cv_predef_stack_protector=yes ;;
1771 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1772 esac],
1773 [AC_MSG_ERROR([test compilation failed])])
1774 ])
1775 libc_extra_cflags=
1776 if test $libc_cv_predef_stack_protector = yes; then
1777 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1778 fi
1779 libc_extra_cppflags=
1781 # Some linkers on some architectures support __ehdr_start but with
1782 # bugs. Make sure usage of it does not create relocations in the
1783 # output (as the linker should resolve them all for us).
1784 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1785 libc_cv_ehdr_start, [
1786 old_CFLAGS="$CFLAGS"
1787 old_LDFLAGS="$LDFLAGS"
1788 old_LIBS="$LIBS"
1789 CFLAGS="$CFLAGS -fPIC"
1790 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1791 LIBS=
1792 AC_LINK_IFELSE([AC_LANG_SOURCE([
1793 typedef struct {
1794 char foo;
1795 long val;
1796 } Ehdr;
1797 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1798 long ehdr (void) { return __ehdr_start.val; }
1799 ])],
1800 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1801 libc_cv_ehdr_start=broken
1802 else
1803 libc_cv_ehdr_start=yes
1804 fi], [libc_cv_ehdr_start=no])
1805 CFLAGS="$old_CFLAGS"
1806 LDFLAGS="$old_LDFLAGS"
1807 LIBS="$old_LIBS"
1808 ])
1809 if test "$libc_cv_ehdr_start" = yes; then
1810 AC_DEFINE([HAVE_EHDR_START])
1811 elif test "$libc_cv_ehdr_start" = broken; then
1812 AC_MSG_WARN([linker is broken -- you should upgrade])
1813 fi
1815 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1816 libc_cv_builtin_trap, [dnl
1817 libc_cv_builtin_trap=no
1818 AC_TRY_COMPILE([], [__builtin_trap ()], [
1819 libc_undefs=`$NM -u conftest.o |
1820 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1821 2>&AS_MESSAGE_LOG_FD` || {
1822 AC_MSG_ERROR([confusing output from $NM -u])
1823 }
1824 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1825 if test -z "$libc_undefs"; then
1826 libc_cv_builtin_trap=yes
1827 fi])])
1828 if test $libc_cv_builtin_trap = yes; then
1829 AC_DEFINE([HAVE_BUILTIN_TRAP])
1830 fi
1832 dnl C++ feature tests.
1833 AC_LANG_PUSH([C++])
1835 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1836 libc_cv_cxx_thread_local, [
1837 old_CXXFLAGS="$CXXFLAGS"
1838 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1839 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1840 #include <thread>
1842 // Compiler support.
1843 struct S
1844 {
1845 S ();
1846 ~S ();
1847 };
1848 thread_local S s;
1849 S * get () { return &s; }
1851 // libstdc++ support.
1852 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1853 #error __cxa_thread_atexit_impl not supported
1854 #endif
1855 ])],
1856 [libc_cv_cxx_thread_local=yes],
1857 [libc_cv_cxx_thread_local=no])
1858 CXXFLAGS="$old_CXXFLAGS"
1859 ])
1860 AC_SUBST(libc_cv_cxx_thread_local)
1862 AC_LANG_POP([C++])
1863 dnl End of C++ feature tests.
1865 ### End of automated tests.
1866 ### Now run sysdeps configure fragments.
1868 # They also can set these variables.
1869 use_ldconfig=no
1870 ldd_rewrite_script=no
1871 libc_cv_sysconfdir=$sysconfdir
1872 libc_cv_localstatedir=$localstatedir
1873 libc_cv_gcc_unwind_find_fde=no
1874 libc_cv_idn=no
1876 # Iterate over all the sysdep directories we will use, running their
1877 # configure fragments.
1878 for dir in $sysnames; do
1879 case $dir in
1880 /*) dest=$dir ;;
1881 *) dest=$srcdir/$dir ;;
1882 esac
1883 if test -r $dest/configure; then
1884 AC_MSG_RESULT(running configure fragment for $dir)
1885 . $dest/configure
1886 fi
1887 done
1889 if test x"$build_mathvec" = xnotset; then
1890 build_mathvec=no
1891 fi
1892 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1894 AC_SUBST(libc_extra_cflags)
1895 AC_SUBST(libc_extra_cppflags)
1897 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1898 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1899 fi
1900 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1902 # A sysdeps configure fragment can reset this if IFUNC is not actually
1903 # usable even though the assembler knows how to generate the symbol type.
1904 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1905 AC_DEFINE(HAVE_IFUNC)
1906 fi
1908 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1909 # configure fragment can override the value to prevent this AC_DEFINE.
1910 AC_SUBST(use_nscd)
1911 if test "x$use_nscd" != xno; then
1912 AC_DEFINE([USE_NSCD])
1913 fi
1914 if test "x$build_nscd" = xdefault; then
1915 build_nscd=$use_nscd
1916 fi
1918 # Test for old glibc 2.0.x headers so that they can be removed properly
1919 # Search only in includedir.
1920 AC_MSG_CHECKING(for old glibc 2.0.x headers)
1921 if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
1922 then
1923 old_glibc_headers=yes
1924 else
1925 old_glibc_headers=no
1926 fi
1927 AC_MSG_RESULT($old_glibc_headers)
1928 if test ${old_glibc_headers} = yes; then
1929 AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
1930 AC_MSG_WARN(*** be removed.)
1931 fi
1932 AC_SUBST(old_glibc_headers)
1934 AC_SUBST(libc_cv_slibdir)
1935 AC_SUBST(libc_cv_rtlddir)
1936 AC_SUBST(libc_cv_localedir)
1937 AC_SUBST(libc_cv_sysconfdir)
1938 AC_SUBST(libc_cv_localstatedir)
1939 AC_SUBST(libc_cv_rootsbindir)
1940 AC_SUBST(libc_cv_forced_unwind)
1942 if test x$use_ldconfig = xyes; then
1943 AC_DEFINE(USE_LDCONFIG)
1944 fi
1945 AC_SUBST(use_ldconfig)
1946 AC_SUBST(ldd_rewrite_script)
1948 AC_SUBST(static)
1949 AC_SUBST(shared)
1951 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1952 [libc_cv_pic_default=yes
1953 cat > conftest.c <<EOF
1954 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1955 # error PIC is default.
1956 #endif
1957 EOF
1958 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1959 libc_cv_pic_default=no
1960 fi
1961 rm -f conftest.*])
1962 AC_SUBST(libc_cv_pic_default)
1964 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1965 [libc_cv_pie_default=yes
1966 cat > conftest.c <<EOF
1967 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1968 # error PIE is default.
1969 #endif
1970 EOF
1971 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1972 libc_cv_pie_default=no
1973 fi
1974 rm -f conftest.*])
1975 AC_SUBST(libc_cv_pie_default)
1977 AC_SUBST(profile)
1978 AC_SUBST(static_nss)
1980 AC_SUBST(DEFINES)
1982 dnl See sysdeps/mach/configure.ac for this variable.
1983 AC_SUBST(mach_interface_list)
1985 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1986 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1987 AC_SUBST(VERSION)
1988 AC_SUBST(RELEASE)
1990 AC_CONFIG_FILES([config.make Makefile])
1991 AC_CONFIG_COMMANDS([default],[[
1992 case $CONFIG_FILES in *config.make*)
1993 echo "$config_vars" >> config.make;;
1994 esac
1995 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1996 AC_OUTPUT