| blob | 2c6308883c58746fa4923d24a9b39eb43a237fc5 |
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 $srcdir; pwd -P`" = "`pwd -P`"; then
84 AC_MSG_ERROR([you must configure in a separate build directory])
85 fi
87 # This will get text that should go into config.make.
88 config_vars=
90 # Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
91 AC_ARG_WITH([gd],
92 AC_HELP_STRING([--with-gd=DIR],
93 [find libgd include dir and library with prefix DIR]),
94 [dnl
95 case "$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)
234 if test "x$bindnow" = xyes; then
235 AC_DEFINE(BIND_NOW)
236 fi
238 dnl Build glibc with -fstack-protector, -fstack-protector-all, or
239 dnl -fstack-protector-strong.
240 AC_ARG_ENABLE([stack-protector],
241 AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
242 [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
243 [enable_stack_protector=$enableval],
244 [enable_stack_protector=no])
245 case "$enable_stack_protector" in
246 all|yes|no|strong) ;;
247 *) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: \"$enable_stack_protector\"]);;
248 esac
250 dnl On some platforms we cannot use dynamic loading. We must provide
251 dnl static NSS modules.
252 AC_ARG_ENABLE([static-nss],
253 AC_HELP_STRING([--enable-static-nss],
254 [build static NSS modules @<:@default=no@:>@]),
255 [static_nss=$enableval],
256 [static_nss=no])
257 dnl Enable static NSS also if we build no shared objects.
258 if test x"$static_nss" = xyes || test x"$shared" = xno; then
259 static_nss=yes
260 AC_DEFINE(DO_STATIC_NSS)
261 fi
263 AC_ARG_ENABLE([force-install],
264 AC_HELP_STRING([--disable-force-install],
265 [don't force installation of files from this package, even if they are older than the installed files]),
266 [force_install=$enableval],
267 [force_install=yes])
268 AC_SUBST(force_install)
270 AC_ARG_ENABLE([maintainer-mode],
271 AC_HELP_STRING([--enable-maintainer-mode],
272 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
273 [maintainer=$enableval],
274 [maintainer=no])
276 dnl On some platforms we allow dropping compatibility with all kernel
277 dnl versions.
278 AC_ARG_ENABLE([kernel],
279 AC_HELP_STRING([--enable-kernel=VERSION],
280 [compile for compatibility with kernel not older than VERSION]),
281 [minimum_kernel=$enableval],
282 [])
283 dnl Prevent unreasonable values.
284 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
285 # Better nothing than this.
286 minimum_kernel=""
287 else
288 if test "$minimum_kernel" = current; then
289 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
290 fi
291 fi
293 dnl For the development we sometimes want gcc to issue even more warnings.
294 dnl This is not the default since many of the extra warnings are not
295 dnl appropriate.
296 AC_ARG_ENABLE([all-warnings],
297 AC_HELP_STRING([--enable-all-warnings],
298 [enable all useful warnings gcc can issue]),
299 [all_warnings=$enableval],
300 [])
301 AC_SUBST(all_warnings)
303 AC_ARG_ENABLE([werror],
304 AC_HELP_STRING([--disable-werror],
305 [do not build with -Werror]),
306 [enable_werror=$enableval],
307 [enable_werror=yes])
308 AC_SUBST(enable_werror)
310 AC_ARG_ENABLE([multi-arch],
311 AC_HELP_STRING([--enable-multi-arch],
312 [enable single DSO with optimizations for multiple architectures]),
313 [multi_arch=$enableval],
314 [multi_arch=default])
316 AC_ARG_ENABLE([experimental-malloc],
317 AC_HELP_STRING([--disable-experimental-malloc],
318 [disable experimental malloc features]),
319 [experimental_malloc=$enableval],
320 [experimental_malloc=yes])
321 AC_SUBST(experimental_malloc)
323 AC_ARG_ENABLE([nss-crypt],
324 AC_HELP_STRING([--enable-nss-crypt],
325 [enable libcrypt to use nss]),
326 [nss_crypt=$enableval],
327 [nss_crypt=no])
328 if test x$nss_crypt = xyes; then
329 nss_includes=-I$(nss-config --includedir 2>/dev/null)
330 if test $? -ne 0; then
331 AC_MSG_ERROR([cannot find include directory with nss-config])
332 fi
333 old_CFLAGS="$CFLAGS"
334 CFLAGS="$CFLAGS $nss_includes"
335 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
336 #include <hasht.h>
337 #include <nsslowhash.h>
338 void f (void) { NSSLOW_Init (); }])],
339 libc_cv_nss_crypt=yes,
340 AC_MSG_ERROR([
341 cannot find NSS headers with lowlevel hash function interfaces]))
342 old_LIBS="$LIBS"
343 old_LDFLAGS="$LDFLAGS"
344 LIBS="$LIBS -lfreebl3"
345 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
346 #include <hasht.h>
347 #include <nsslowhash.h>],
348 [NSSLOW_Init();])],
349 libc_cv_nss_crypt=yes,
350 AC_MSG_ERROR([
351 cannot link program using lowlevel NSS hash functions]))
352 # Check to see if there is a static NSS cryptographic library.
353 # If there isn't then we can't link anything with libcrypt.a,
354 # and that might mean disabling some static tests.
355 LDFLAGS="$LDFLAGS -static"
356 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
357 #include <hasht.h>
358 #include <nsslowhash.h>],
359 [NSSLOW_Init();])],
360 libc_cv_static_nss_crypt=yes,
361 libc_cv_static_nss_crypt=no)
362 LDFLAGS="$old_LDFLAGS"
363 CFLAGS="$old_CFLAGS"
364 LIBS="$old_LIBS"
365 else
366 libc_cv_nss_crypt=no
367 libc_cv_static_nss_crypt=no
368 fi
369 AC_SUBST(libc_cv_nss_crypt)
370 AC_SUBST(libc_cv_static_nss_crypt)
373 AC_ARG_ENABLE([obsolete-rpc],
374 AC_HELP_STRING([--enable-obsolete-rpc],
375 [build and install the obsolete RPC code for link-time usage]),
376 [link_obsolete_rpc=$enableval],
377 [link_obsolete_rpc=no])
378 AC_SUBST(link_obsolete_rpc)
380 if test "$link_obsolete_rpc" = yes; then
381 AC_DEFINE(LINK_OBSOLETE_RPC)
382 fi
384 AC_ARG_ENABLE([obsolete-nsl],
385 AC_HELP_STRING([--enable-obsolete-nsl],
386 [build and install the obsolete libnsl library and depending NSS modules]),
387 [build_obsolete_nsl=$enableval],
388 [build_obsolete_nsl=no])
389 AC_SUBST(build_obsolete_nsl)
391 if test "$build_obsolete_nsl" = yes; then
392 AC_DEFINE(LINK_OBSOLETE_NSL)
393 fi
395 AC_ARG_ENABLE([systemtap],
396 [AS_HELP_STRING([--enable-systemtap],
397 [enable systemtap static probe points @<:@default=no@:>@])],
398 [systemtap=$enableval],
399 [systemtap=no])
400 if test "x$systemtap" != xno; then
401 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
402 old_CFLAGS="$CFLAGS"
403 CFLAGS="-std=gnu11 $CFLAGS"
404 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
405 void foo (int i, void *p)
406 {
407 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
408 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
409 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
410 CFLAGS="$old_CFLAGS"])
411 if test $libc_cv_sdt = yes; then
412 AC_DEFINE([USE_STAP_PROBE])
413 elif test "x$systemtap" != xauto; then
414 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
415 fi
416 fi
418 AC_ARG_ENABLE([build-nscd],
419 [AS_HELP_STRING([--disable-build-nscd],
420 [disable building and installing the nscd daemon])],
421 [build_nscd=$enableval],
422 [build_nscd=default])
423 AC_SUBST(build_nscd)
425 # Note the use of $use_nscd is near the bottom of the file.
426 AC_ARG_ENABLE([nscd],
427 [AS_HELP_STRING([--disable-nscd],
428 [library functions will not contact the nscd daemon])],
429 [use_nscd=$enableval],
430 [use_nscd=yes])
432 AC_ARG_ENABLE([pt_chown],
433 [AS_HELP_STRING([--enable-pt_chown],
434 [Enable building and installing pt_chown])],
435 [build_pt_chown=$enableval],
436 [build_pt_chown=no])
437 AC_SUBST(build_pt_chown)
438 if test "$build_pt_chown" = yes; then
439 AC_DEFINE(HAVE_PT_CHOWN)
440 fi
442 AC_ARG_ENABLE([tunables],
443 [AS_HELP_STRING([--enable-tunables],
444 [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
445 [have_tunables=$enableval],
446 [have_tunables=yes])
447 AC_SUBST(have_tunables)
448 if test "$have_tunables" = yes; then
449 AC_DEFINE(HAVE_TUNABLES)
450 fi
452 # The abi-tags file uses a fairly simplistic model for name recognition that
453 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
454 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
455 # This doesn't get used much beyond that, so it's fairly safe.
456 case "$host_os" in
457 linux*)
458 ;;
459 gnu*)
460 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
461 ;;
462 esac
464 AC_ARG_ENABLE([mathvec],
465 [AS_HELP_STRING([--enable-mathvec],
466 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
467 [build_mathvec=$enableval],
468 [build_mathvec=notset])
470 # We keep the original values in `$config_*' and never modify them, so we
471 # can write them unchanged into config.make. Everything else uses
472 # $machine, $vendor, and $os, and changes them whenever convenient.
473 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
475 # Don't allow vendor == "unknown"
476 test "$config_vendor" = unknown && config_vendor=
477 config_os="`echo $config_os | sed 's/^unknown-//'`"
479 # Some configurations imply other options.
480 elf=yes
482 # The configure fragment of an add-on port can modify these to supplement
483 # or override the table in the case statement below. No fragment should
484 # ever change the config_* variables, however.
485 machine=$config_machine
486 vendor=$config_vendor
487 os=$config_os
488 base_os=''
490 submachine=
491 AC_ARG_WITH([cpu],
492 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
493 [dnl
494 case "$withval" in
495 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
496 no) ;;
497 *) submachine="$withval" ;;
498 esac
499 ])
501 # An preconfigure script can set this when it wants to disable the sanity
502 # check below.
503 libc_config_ok=no
505 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
506 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
508 dnl Having this here, though empty, makes sure that if add-ons' fragments
509 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
510 dnl our AC_OUTPUT will actually use it.
511 AC_CONFIG_SUBDIRS()
513 case "$enable_add_ons" in
514 ''|no) add_ons= ;;
515 yes|'*')
516 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
517 sed 's@/[[^/]]*$@@' | sort | uniq`
518 add_ons_automatic=yes
519 ;;
520 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
521 add_ons_automatic=no ;;
522 esac
524 configured_add_ons=
525 add_ons_sfx=
526 add_ons_pfx=
527 if test x"$add_ons" != x; then
528 for f in $add_ons; do
529 # Some sanity checks
530 case "$f" in
531 crypt)
532 AC_MSG_ERROR([
533 *** It seems that you're using an old \`crypt' add-on. crypt is now
534 *** part of glibc and using the old add-on will not work with this
535 *** release. Start again with fresh sources and without the old
536 *** \`crypt' add-on.])
537 ;;
538 localedata)
539 AC_MSG_ERROR([
540 *** It seems that you're using an old \`localedata' add-on. localedata
541 *** is now part of glibc and using the old add-on will not work with
542 *** this release. Start again with fresh sources and without the old
543 *** \`localedata' add-on.])
544 ;;
545 esac
546 done
548 # Now source each add-on's configure fragment.
549 # The fragments can use $srcdir/$libc_add_on to find themselves,
550 # and test $add_ons_automatic to see if they were explicitly requested.
551 # A fragment can clear (or even change) $libc_add_on to affect
552 # whether it goes into the list to be actually used in the build.
553 use_add_ons=
554 for libc_add_on in $add_ons; do
555 # Test whether such a directory really exists.
556 # It can be absolute, or relative to $srcdir, or relative to the build dir.
557 case "$libc_add_on" in
558 /*)
559 libc_add_on_srcdir=$libc_add_on
560 ;;
561 *)
562 test -d "$srcdir/$libc_add_on" || {
563 if test -d "$libc_add_on"; then
564 libc_add_on="`pwd`/$libc_add_on"
565 else
566 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
567 fi
568 }
569 libc_add_on_srcdir=$srcdir/$libc_add_on
570 ;;
571 esac
573 libc_add_on_frag=$libc_add_on_srcdir/configure
574 libc_add_on_canonical=
575 libc_add_on_config_subdirs=
576 if test -r "$libc_add_on_frag"; then
577 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
578 libc_add_on_canonical=unknown
579 libc_add_on_subdirs=
580 . "$libc_add_on_frag"
581 test -z "$libc_add_on" || {
582 configured_add_ons="$configured_add_ons $libc_add_on"
583 if test "x$libc_add_on_canonical" = xunknown; then
584 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
585 fi
586 for d in $libc_add_on_subdirs; do
587 case "$libc_add_on" in
588 /*) subdir_srcdir="$libc_add_on" ;;
589 *) subdir_srcdir="\$(..)$libc_add_on" ;;
590 esac
591 case "$d" in
592 .)
593 d="${libc_add_on_canonical:-$libc_add_on}"
594 ;;
595 /*)
596 subdir_srcdir="$d"
597 ;;
598 *)
599 subdir_srcdir="$subdir_srcdir/$d"
600 ;;
601 esac
602 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
603 add_on_subdirs="$add_on_subdirs $d"
604 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
605 $d-srcdir = $subdir_srcdir"
606 done
607 for d in $libc_add_on_config_subdirs; do
608 case "$d" in
609 /*) AC_MSG_ERROR(dnl
610 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
611 esac
612 if test ! -d "$libc_add_on_srcdir/$d"; then
613 AC_MSG_ERROR(fragment wants to configure missing directory $d)
614 fi
615 case "$libc_add_on" in
616 /*) AC_MSG_ERROR(dnl
617 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
618 esac
619 subdirs="$subdirs $libc_add_on/$d"
620 done
621 }
622 fi
623 if test -n "$libc_add_on"; then
624 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
625 use_add_ons="$use_add_ons $libc_add_on"
626 add_ons_pfx="$add_ons_pfx $libc_add_on/"
627 test -z "$libc_add_on_canonical" ||
628 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
629 fi
630 done
631 # Use echo to strip excess whitespace.
632 add_ons="`echo $use_add_ons`"
633 fi
634 AC_SUBST(add_ons)
635 AC_SUBST(add_on_subdirs)
638 ###
639 ### By using the undocumented --enable-hacker-mode option for configure
640 ### one can skip this test to make the configuration not fail for unsupported
641 ### platforms.
642 ###
643 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
644 case "$machine-$host_os" in
645 *-linux* | *-gnu*)
646 ;;
647 *)
648 AC_MSG_ERROR([
649 *** The GNU C library is currently unavailable for this platform.
650 *** If you are interested in seeing glibc on this platform visit
651 *** the "How to submit a new port" in the wiki:
652 *** https://sourceware.org/glibc/wiki/#Development
653 *** and join the community!])
654 ;;
655 esac
656 fi
658 # Set base_machine if not set by a preconfigure fragment.
659 test -n "$base_machine" || base_machine=$machine
660 AC_SUBST(base_machine)
662 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
663 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
664 [libc_cv_ssp=yes],
665 [libc_cv_ssp=no])
666 ])
668 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
669 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
670 [libc_cv_ssp_strong=yes],
671 [libc_cv_ssp_strong=no])
672 ])
674 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
675 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
676 [libc_cv_ssp_all=yes],
677 [libc_cv_ssp_all=no])
678 ])
680 stack_protector=
681 no_stack_protector=
682 if test "$libc_cv_ssp" = yes; then
683 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
684 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
685 fi
687 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
688 stack_protector="-fstack-protector"
689 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
690 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
691 stack_protector="-fstack-protector-all"
692 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
693 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
694 stack_protector="-fstack-protector-strong"
695 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
696 else
697 stack_protector="-fno-stack-protector"
698 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
699 fi
700 AC_SUBST(libc_cv_ssp)
701 AC_SUBST(stack_protector)
702 AC_SUBST(no_stack_protector)
704 if test -n "$stack_protector"; then
705 dnl Don't run configure tests with stack-protection on, to avoid problems with
706 dnl bootstrapping.
707 no_ssp=-fno-stack-protector
708 else
709 no_ssp=
711 if test "$enable_stack_protector" != no; then
712 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
713 fi
714 fi
716 # For the multi-arch option we need support in the assembler & linker.
717 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
718 libc_cv_ld_gnu_indirect_function, [dnl
719 cat > conftest.S <<EOF
720 .type foo,%gnu_indirect_function
721 foo:
722 .globl _start
723 _start:
724 .globl __start
725 __start:
726 .data
727 #ifdef _LP64
728 .quad foo
729 #else
730 .long foo
731 #endif
732 EOF
733 libc_cv_ld_gnu_indirect_function=no
734 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
735 -nostartfiles -nostdlib $no_ssp \
736 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
737 # Do a link to see if the backend supports IFUNC relocs.
738 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
739 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
740 libc_cv_ld_gnu_indirect_function=yes
741 }
742 fi
743 rm -f conftest*])
745 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
746 AC_CACHE_CHECK([for gcc attribute ifunc support],
747 libc_cv_gcc_indirect_function, [dnl
748 cat > conftest.c <<EOF
749 extern int func (int);
750 int used_func (int a)
751 {
752 return a;
753 }
754 static void *resolver ()
755 {
756 return &used_func;
757 }
758 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
759 EOF
760 libc_cv_gcc_indirect_function=no
761 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
762 2>&AS_MESSAGE_LOG_FD ; then
763 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
764 libc_cv_gcc_indirect_function=yes
765 fi
766 fi
767 rm -f conftest*])
769 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
770 if test x"$multi_arch" = xyes; then
771 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
772 else
773 multi_arch=no
774 fi
775 fi
776 if test x"$libc_cv_gcc_indirect_function" != xyes &&
777 test x"$multi_arch" = xyes; then
778 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
779 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
780 fi
781 multi_arch_d=
782 if test x"$multi_arch" != xno; then
783 multi_arch_d=/multiarch
784 fi
786 # Compute the list of sysdep directories for this configuration.
787 # This can take a while to compute.
788 sysdep_dir=$srcdir/sysdeps
789 AC_MSG_CHECKING(sysdep dirs)
790 dnl We need to use [ and ] for other purposes for a while now.
791 changequote(,)dnl
792 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
793 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
795 test "x$base_os" != x || case "$os" in
796 gnu*)
797 base_os=mach/hurd ;;
798 linux*)
799 base_os=unix/sysv ;;
800 esac
802 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
803 tail=$os
804 ostry=$os
805 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
806 ostry="$ostry /$o"
807 tail=$o
808 done
809 o=`echo $tail | sed 's/[0-9]*$//'`
810 if test $o != $tail; then
811 ostry="$ostry /$o"
812 fi
813 # For linux-gnu, try linux-gnu, then linux.
814 o=`echo $tail | sed 's/-.*$//'`
815 if test $o != $tail; then
816 ostry="$ostry /$o"
817 fi
819 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
820 base=
821 tail=$base_os
822 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
823 set $b
824 base="$base /$1"
825 tail="$2"
826 done
828 # For sparc/sparc32, try sparc/sparc32 and then sparc.
829 mach=
830 tail=$machine${submachine:+/$submachine}
831 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
832 set $m
833 # Prepend the machine's FPU directory unless --without-fp.
834 if test "$with_fp" = yes; then
835 maybe_fpu=/fpu
836 else
837 maybe_fpu=/nofpu
838 fi
839 # For each machine term, try it with and then without /multiarch.
840 for try_fpu in $maybe_fpu ''; do
841 for try_multi in $multi_arch_d ''; do
842 mach="$mach /$1$try_fpu$try_multi"
843 done
844 done
845 tail="$2"
846 done
848 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
849 changequote([,])dnl
851 # Find what sysdep directories exist.
852 sysnames_add_ons=
853 sysnames=
854 for b in $base ''; do
855 for m0 in $mach ''; do
856 for v in /$vendor ''; do
857 test "$v" = / && continue
858 for o in /$ostry ''; do
859 test "$o" = / && continue
860 for m in $mach ''; do
861 for d in $add_ons_pfx ''; do
862 for a in $add_ons_sfx ''; do
863 try_suffix="$m0$b$v$o$m"
864 if test -n "$try_suffix"; then
865 try_srcdir="${srcdir}/"
866 case "$d" in
867 /*) try_srcdir= ;;
868 esac
869 try="${d}sysdeps$try_suffix$a"
870 test -n "$enable_debug_configure" &&
871 echo "$0 [DEBUG]: try $try" >&2
872 if test -d "$try_srcdir$try"; then
873 sysnames="$sysnames $try"
874 { test -n "$o" || test -n "$b"; } && os_used=t
875 { test -n "$m" || test -n "$m0"; } && machine_used=t
876 case x${m0:-$m} in
877 x*/$submachine) submachine_used=t ;;
878 esac
879 if test -n "$d"; then
880 case "$sysnames_add_ons" in
881 *" $d "*) ;;
882 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
883 esac
884 fi
885 fi
886 fi
887 done
888 done
889 done
890 done
891 done
892 done
893 done
895 # If the assembler supports gnu_indirect_function symbol type and the
896 # architecture supports multi-arch, we enable multi-arch by default.
897 case $sysnames_add_ons$sysnames in
898 *"$multi_arch_d"*)
899 ;;
900 *)
901 test x"$multi_arch" = xdefault && multi_arch=no
902 ;;
903 esac
904 if test x"$multi_arch" != xno; then
905 AC_DEFINE(USE_MULTIARCH)
906 fi
907 AC_SUBST(multi_arch)
909 if test -z "$os_used" && test "$os" != none; then
910 AC_MSG_ERROR(Operating system $os is not supported.)
911 fi
912 if test -z "$machine_used" && test "$machine" != none; then
913 AC_MSG_ERROR(The $machine is not supported.)
914 fi
915 if test -z "$submachine_used" && test -n "$submachine"; then
916 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
917 fi
918 AC_SUBST(submachine)
920 # We have now validated the configuration.
922 # Expand the list of system names into a full list of directories
923 # from each element's parent name and Implies file (if present).
924 set $sysnames
925 names=
926 while test $# -gt 0; do
927 name=$1
928 shift
930 case " $names " in *" $name "*)
931 # Already in the list.
932 continue
933 esac
935 # Report each name as we discover it, so there is no long pause in output.
936 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
938 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
940 case $name in
941 /*) xsrcdir= ;;
942 *) xsrcdir=$srcdir/ ;;
943 esac
944 test -n "$enable_debug_configure" &&
945 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
947 for implies_file in Implies Implies-before Implies-after; do
948 implies_type=`echo $implies_file | sed s/-/_/`
949 eval ${implies_type}=
950 if test -f $xsrcdir$name/$implies_file; then
951 # Collect more names from the `Implies' file (removing comments).
952 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
953 for x in $implied_candidate; do
954 found=no
955 if test -d $xsrcdir$name_base/$x; then
956 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
957 found=yes
958 fi
959 for d in $add_ons_pfx ''; do
960 try="${d}sysdeps/$x"
961 case $d in
962 /*) try_srcdir= ;;
963 *) try_srcdir=$srcdir/ ;;
964 esac
965 test -n "$enable_debug_configure" &&
966 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
967 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
968 then
969 eval "${implies_type}=\"\$${implies_type} \$try\""
970 found=yes
971 case "$sysnames_add_ons" in
972 *" $d "*) ;;
973 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
974 esac
975 fi
976 done
977 if test $found = no; then
978 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
979 fi
980 done
981 fi
982 done
984 # Add NAME to the list of names.
985 names="$names $name"
987 # Find the parent of NAME, using the empty string if it has none.
988 changequote(,)dnl
989 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
990 changequote([,])dnl
992 test -n "$enable_debug_configure" &&
993 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
994 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
996 # Add the names implied by NAME, and NAME's parent (if it has one), to
997 # the list of names to be processed (the argument list). We prepend the
998 # implied names to the list and append the parent. We want implied
999 # directories to come before further directories inferred from the
1000 # configuration components; this ensures that for sysv4, unix/common
1001 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
1002 # after sysv4).
1003 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
1004 test -n "$sysnames" && set $sysnames
1005 done
1007 # Add the default directories.
1008 default_sysnames="sysdeps/generic"
1009 sysnames="$names $default_sysnames"
1010 AC_SUBST(sysnames)
1011 # The other names were emitted during the scan.
1012 AC_MSG_RESULT($default_sysnames)
1014 # Collect the list of add-ons that supply partial sysdeps trees.
1015 sysdeps_add_ons=
1016 for add_on in $add_ons; do
1017 case "$add_on" in
1018 /*) xsrcdir= ;;
1019 *) xsrcdir="$srcdir/" ;;
1020 esac
1022 test -d "$xsrcdir$add_on/sysdeps" || {
1023 case "$configured_add_ons " in
1024 *" $add_on "*) ;;
1025 *|'')
1026 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
1027 ;;
1028 esac
1029 continue
1030 }
1032 sysdeps_add_ons="$sysdeps_add_ons $add_on"
1033 case "$sysnames_add_ons" in
1034 *" $add_on/ "*) ;;
1035 *|'')
1036 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
1037 continue ;;
1038 esac
1040 found=no
1041 for d in $sysnames; do
1042 case "$d" in
1043 $add_on/sysdeps/*) ;;
1044 *) continue ;;
1045 esac
1046 (cd "$xsrcdir$d" && for f in *[[!~]]; do
1047 case "$f" in
1048 sys|bits)
1049 for ff in $f/*.h; do
1050 test -d "$ff" || { test -e "$ff" && exit 88; }
1051 done
1052 ;;
1053 *)
1054 test -d "$f" || { test -e "$f" && exit 88; }
1055 ;;
1056 esac
1057 done)
1058 if test $? -eq 88; then
1059 found=yes
1060 break
1061 fi
1062 done
1063 if test $found = no; then
1064 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
1065 fi
1066 done
1067 AC_SUBST(sysdeps_add_ons)
1070 ### Locate tools.
1072 AC_PROG_INSTALL
1073 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
1074 # The makefiles need to use a different form to find it in $srcdir.
1075 INSTALL='\$(..)./scripts/install-sh -c'
1076 fi
1077 AC_PROG_LN_S
1079 LIBC_PROG_BINUTILS
1081 # Accept binutils 2.22 or newer.
1082 AC_CHECK_PROG_VER(AS, $AS, --version,
1083 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
1084 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1085 AS=: critic_missing="$critic_missing as")
1087 if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
1088 # Accept gold 1.14 or higher
1089 AC_CHECK_PROG_VER(LD, $LD, --version,
1090 [GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
1091 [1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
1092 LD=: critic_missing="$critic_missing GNU gold")
1093 else
1094 AC_CHECK_PROG_VER(LD, $LD, --version,
1095 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
1096 [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1097 LD=: critic_missing="$critic_missing GNU ld")
1098 fi
1100 # These programs are version sensitive.
1101 AC_CHECK_TOOL_PREFIX
1102 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1103 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1104 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1106 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1107 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1108 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1109 MSGFMT=: aux_missing="$aux_missing msgfmt")
1110 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1111 [GNU texinfo.* \([0-9][0-9.]*\)],
1112 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1113 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1114 AC_CHECK_PROG_VER(SED, sed, --version,
1115 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1116 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1117 SED=: aux_missing="$aux_missing sed")
1118 AC_CHECK_PROG_VER(AWK, gawk, --version,
1119 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1120 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1122 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1123 AC_TRY_COMPILE([], [
1124 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 9)
1125 #error insufficient compiler
1126 #endif],
1127 [libc_cv_compiler_ok=yes],
1128 [libc_cv_compiler_ok=no])])
1129 AS_IF([test $libc_cv_compiler_ok != yes],
1130 [critic_missing="$critic_missing compiler"])
1132 AC_CHECK_TOOL(NM, nm, false)
1134 if test "x$maintainer" = "xyes"; then
1135 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1136 case "x$AUTOCONF" in
1137 xno|x|x:) AUTOCONF=no ;;
1138 *)
1139 AC_CACHE_CHECK(dnl
1140 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1141 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1142 libc_cv_autoconf_works=yes
1143 else
1144 libc_cv_autoconf_works=no
1145 fi])
1146 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1147 ;;
1148 esac
1149 if test "x$AUTOCONF" = xno; then
1150 aux_missing="$aux_missing autoconf"
1151 fi
1152 else
1153 AUTOCONF=no
1154 fi
1156 # Check for python3 if available, or else python.
1157 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1158 case "x$PYTHON_PROG" in
1159 xno|x|x:) PYTHON_PROG=no ;;
1160 *) ;;
1161 esac
1163 if test "x$PYTHON_PROG" = xno; then
1164 aux_missing="$aux_missing python"
1165 else
1166 PYTHON="$PYTHON_PROG -B"
1167 AC_SUBST(PYTHON)
1168 fi
1170 test -n "$critic_missing" && AC_MSG_ERROR([
1171 *** These critical programs are missing or too old:$critic_missing
1172 *** Check the INSTALL file for required versions.])
1174 test -n "$aux_missing" && AC_MSG_WARN([
1175 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1176 *** some features or tests will be disabled.
1177 *** Check the INSTALL file for required versions.])
1179 # if using special system headers, find out the compiler's sekrit
1180 # header directory and add that to the list. NOTE: Only does the right
1181 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1182 if test -n "$sysheaders"; then
1183 SYSINCLUDES=-nostdinc
1184 for d in include include-fixed; do
1185 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1186 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1187 done
1188 SYSINCLUDES="$SYSINCLUDES \
1189 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1190 if test -n "$CXX"; then
1191 CXX_SYSINCLUDES=
1192 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1193 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1194 test "x$cxxheaders" != x &&
1195 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1196 done
1197 fi
1198 fi
1199 AC_SUBST(SYSINCLUDES)
1200 AC_SUBST(CXX_SYSINCLUDES)
1202 # Obtain some C++ header file paths. This is used to make a local
1203 # copy of those headers in Makerules.
1204 if test -n "$CXX"; then
1205 find_cxx_header () {
1206 echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
1207 | sed -n "\,$1:,{s/:\$//;p}"
1208 }
1209 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1210 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1211 CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
1212 fi
1213 AC_SUBST(CXX_CSTDLIB_HEADER)
1214 AC_SUBST(CXX_CMATH_HEADER)
1215 AC_SUBST(CXX_BITS_STD_ABS_H)
1217 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1218 # since this would lead to problems installing/building glibc.
1219 # LD_LIBRARY_PATH contains the current directory if one of the following
1220 # is true:
1221 # - one of the terminals (":" and ";") is the first or last sign
1222 # - two terminals occur directly after each other
1223 # - the path contains an element with a dot in it
1224 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1225 changequote(,)dnl
1226 case ${LD_LIBRARY_PATH} in
1227 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1228 ld_library_path_setting="contains current directory"
1229 ;;
1230 *)
1231 ld_library_path_setting="ok"
1232 ;;
1233 esac
1234 changequote([,])dnl
1235 AC_MSG_RESULT($ld_library_path_setting)
1236 if test "$ld_library_path_setting" != "ok"; then
1237 AC_MSG_ERROR([
1238 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1239 *** building glibc. Please change the environment variable
1240 *** and run configure again.])
1241 fi
1243 AC_PATH_PROG(BASH_SHELL, bash, no)
1245 AC_PATH_PROG(PERL, perl, no)
1246 if test "$PERL" != no &&
1247 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1248 PERL=no
1249 fi
1250 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1251 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1252 AC_CHECK_PROG_VER(BISON, bison, --version,
1253 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1254 [2.7*|[3-9].*|[1-9][0-9]*],
1255 BISON=no)
1257 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1258 cat > conftest.s <<EOF
1259 .text
1260 foo:
1261 .set glibc_conftest_frobozz,foo
1262 .globl glibc_conftest_frobozz
1263 EOF
1264 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1265 # (but it doesn't work), so we must do a linking check to be sure.
1266 cat > conftest1.c <<\EOF
1267 extern int glibc_conftest_frobozz;
1268 void _start() { glibc_conftest_frobozz = 1; }
1269 EOF
1270 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1271 -nostartfiles -nostdlib $no_ssp \
1272 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1273 libc_cv_asm_set_directive=yes
1274 else
1275 libc_cv_asm_set_directive=no
1276 fi
1277 rm -f conftest*])
1278 if test $libc_cv_asm_set_directive = yes; then
1279 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1280 fi
1282 AC_CACHE_CHECK(linker support for protected data symbol,
1283 libc_cv_protected_data,
1284 [cat > conftest.c <<EOF
1285 int bar __attribute__ ((visibility ("protected"))) = 1;
1286 EOF
1287 libc_cv_protected_data=no
1288 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1289 cat > conftest.c <<EOF
1290 extern int bar;
1291 int main (void) { return bar; }
1292 EOF
1293 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1294 libc_cv_protected_data=yes
1295 fi
1296 fi
1297 rm -f conftest.*
1298 ])
1299 AC_SUBST(libc_cv_protected_data)
1301 AC_CACHE_CHECK(linker support for INSERT in linker script,
1302 libc_cv_insert,
1303 [cat > conftest.c <<EOF
1304 const int __attribute__ ((section(".bar"))) bar = 0x12345678;
1305 int test (void) { return bar; }
1306 EOF
1307 cat > conftest.t <<EOF
1308 SECTIONS
1309 {
1310 .bar : { *(.bar) }
1311 }
1312 INSERT AFTER .rela.dyn;
1313 EOF
1314 libc_cv_insert=no
1315 if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
1316 libc_cv_insert=yes
1317 fi
1318 rm -f conftest.*
1319 ])
1320 AC_SUBST(libc_cv_insert)
1322 AC_CACHE_CHECK(for broken __attribute__((alias())),
1323 libc_cv_broken_alias_attribute,
1324 [cat > conftest.c <<EOF
1325 extern int foo (int x) __asm ("xyzzy");
1326 int bar (int x) { return x; }
1327 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1328 extern int dfoo;
1329 extern __typeof (dfoo) dfoo __asm ("abccb");
1330 int dfoo = 1;
1331 EOF
1332 libc_cv_broken_alias_attribute=yes
1333 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1334 if grep 'xyzzy' conftest.s >/dev/null &&
1335 grep 'abccb' conftest.s >/dev/null; then
1336 libc_cv_broken_alias_attribute=no
1337 fi
1338 fi
1339 rm -f conftest.c conftest.s
1340 ])
1341 if test $libc_cv_broken_alias_attribute = yes; then
1342 AC_MSG_ERROR(working alias attribute support required)
1343 fi
1345 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1346 libc_cv_have_sdata_section,
1347 [echo "int i;" > conftest.c
1348 libc_cv_have_sdata_section=no
1349 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1350 | grep '\.sdata' >/dev/null; then
1351 libc_cv_have_sdata_section=yes
1352 fi
1353 rm -f conftest.c conftest.so
1354 ])
1355 if test $libc_cv_have_sdata_section = yes; then
1356 AC_DEFINE(HAVE_SDATA_SECTION)
1357 fi
1359 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1360 libc_cv_ctors_header, [dnl
1361 libc_cv_ctors_header=yes
1362 LIBC_TRY_LINK_STATIC([
1363 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1364 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1365 ],
1366 [dnl
1367 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1368 { gsub(/\@<:@ */, "@<:@") }
1369 $2 == ".ctors" || $2 == ".dtors" {
1370 size = strtonum("0x" $6)
1371 align = strtonum("0x" $NF)
1372 seen@<:@$2@:>@ = 1
1373 stub@<:@$2@:>@ = size == align * 2
1374 }
1375 END {
1376 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1377 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1378 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1379 }
1380 '], [libc_cv_ctors_header=no])
1381 ], [dnl
1382 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1383 ])
1384 ])
1385 if test $libc_cv_ctors_header = no; then
1386 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1387 fi
1389 AC_CACHE_CHECK(for libunwind-support in compiler,
1390 libc_cv_cc_with_libunwind, [
1391 cat > conftest.c <<EOF
1392 int main (void) { return 0; }
1393 EOF
1394 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1395 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1396 libc_cv_cc_with_libunwind=yes
1397 else
1398 libc_cv_cc_with_libunwind=no
1399 fi
1400 rm -f conftest*])
1401 AC_SUBST(libc_cv_cc_with_libunwind)
1402 if test $libc_cv_cc_with_libunwind = yes; then
1403 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1404 fi
1406 ASFLAGS_config=
1407 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1408 libc_cv_as_noexecstack, [dnl
1409 cat > conftest.c <<EOF
1410 void foo (void) { }
1411 EOF
1412 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1413 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1414 && grep .note.GNU-stack conftest.s >/dev/null \
1415 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1416 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1417 then
1418 libc_cv_as_noexecstack=yes
1419 else
1420 libc_cv_as_noexecstack=no
1421 fi
1422 rm -f conftest*])
1423 if test $libc_cv_as_noexecstack = yes; then
1424 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1425 fi
1426 AC_SUBST(ASFLAGS_config)
1428 AC_CACHE_CHECK(for -z combreloc,
1429 libc_cv_z_combreloc, [dnl
1430 cat > conftest.c <<EOF
1431 extern int bar (int);
1432 extern int mumble;
1433 int foo (void) { return bar (mumble); }
1434 EOF
1435 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1436 -fPIC -shared $no_ssp -o conftest.so conftest.c
1437 -nostdlib -nostartfiles
1438 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1439 then
1440 dnl The following test is a bit weak. We must use a tool which can test
1441 dnl cross-platform since the gcc used can be a cross compiler. Without
1442 dnl introducing new options this is not easily doable. Instead use a tool
1443 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1444 dnl look for a section named .rel.dyn or .rela.dyn.
1445 if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
1446 libc_cv_z_combreloc=yes
1447 else
1448 libc_cv_z_combreloc=no
1449 fi
1450 else
1451 libc_cv_z_combreloc=no
1452 fi
1453 rm -f conftest*])
1454 if test "$libc_cv_z_combreloc" = yes; then
1455 AC_DEFINE(HAVE_Z_COMBRELOC)
1456 fi
1457 AC_SUBST(libc_cv_z_combreloc)
1459 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1460 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1461 AC_SUBST(libc_cv_z_execstack)
1463 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1464 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1465 ])
1467 AC_SUBST(libc_cv_fpie)
1469 AC_CACHE_CHECK(for --hash-style option,
1470 libc_cv_hashstyle, [dnl
1471 cat > conftest.c <<EOF
1472 int _start (void) { return 42; }
1473 EOF
1474 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1475 -fPIC -shared -o conftest.so conftest.c
1476 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1477 then
1478 libc_cv_hashstyle=yes
1479 else
1480 libc_cv_hashstyle=no
1481 fi
1482 rm -f conftest*])
1483 AC_SUBST(libc_cv_hashstyle)
1485 # The linker's default -shared behavior is good enough if it
1486 # does these things that our custom linker scripts ensure that
1487 # all allocated NOTE sections come first.
1488 if test "$use_default_link" = default; then
1489 AC_CACHE_CHECK([for sufficient default -shared layout],
1490 libc_cv_use_default_link, [dnl
1491 libc_cv_use_default_link=no
1492 cat > conftest.s <<\EOF
1493 .section .note.a,"a",%note
1494 .balign 4
1495 .long 4,4,9
1496 .string "GNU"
1497 .string "foo"
1498 .section .note.b,"a",%note
1499 .balign 4
1500 .long 4,4,9
1501 .string "GNU"
1502 .string "bar"
1503 EOF
1504 if AC_TRY_COMMAND([dnl
1505 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1506 ac_try=`$READELF -S conftest.so | sed -n \
1507 ['${x;p;}
1508 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1509 t a
1510 b
1511 : a
1512 H']`
1513 then
1514 libc_seen_a=no libc_seen_b=no
1515 set -- $ac_try
1516 while test $# -ge 2 -a "$1" = NOTE; do
1517 case "$2" in
1518 .note.a) libc_seen_a=yes ;;
1519 .note.b) libc_seen_b=yes ;;
1520 esac
1521 shift 2
1522 done
1523 case "$libc_seen_a$libc_seen_b" in
1524 yesyes)
1525 libc_cv_use_default_link=yes
1526 ;;
1527 *)
1528 echo >&AS_MESSAGE_LOG_FD "\
1529 $libc_seen_a$libc_seen_b from:
1530 $ac_try"
1531 ;;
1532 esac
1533 fi
1534 rm -f conftest*])
1535 use_default_link=$libc_cv_use_default_link
1536 fi
1538 AC_CACHE_CHECK(for GLOB_DAT reloc,
1539 libc_cv_has_glob_dat, [dnl
1540 cat > conftest.c <<EOF
1541 extern int mumble;
1542 int foo (void) { return mumble; }
1543 EOF
1544 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1545 -fPIC -shared -o conftest.so conftest.c
1546 -nostdlib -nostartfiles $no_ssp
1547 1>&AS_MESSAGE_LOG_FD])
1548 then
1549 dnl look for GLOB_DAT relocation.
1550 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1551 libc_cv_has_glob_dat=yes
1552 else
1553 libc_cv_has_glob_dat=no
1554 fi
1555 else
1556 libc_cv_has_glob_dat=no
1557 fi
1558 rm -f conftest*])
1559 AC_SUBST(libc_cv_has_glob_dat)
1561 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1562 if libc_cv_output_format=`
1563 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1564 then
1565 :
1566 else
1567 libc_cv_output_format=
1568 fi
1569 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1570 AC_SUBST(libc_cv_output_format)
1572 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1573 cat > conftest.c <<EOF
1574 int foo;
1575 EOF
1576 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1577 conftest.c 1>&AS_MESSAGE_LOG_FD])
1578 then
1579 libc_cv_fno_toplevel_reorder=yes
1580 else
1581 libc_cv_fno_toplevel_reorder=no
1582 fi
1583 rm -f conftest*])
1584 if test $libc_cv_fno_toplevel_reorder = yes; then
1585 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1586 else
1587 fno_unit_at_a_time=-fno-unit-at-a-time
1588 fi
1589 AC_SUBST(fno_unit_at_a_time)
1591 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1592 [dnl
1593 cat > conftest.c <<EOF
1594 __thread int i;
1595 void foo (void)
1596 {
1597 i = 10;
1598 }
1599 EOF
1600 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1601 conftest.c 1>&AS_MESSAGE_LOG_FD])
1602 then
1603 libc_cv_mtls_dialect_gnu2=yes
1604 else
1605 libc_cv_mtls_dialect_gnu2=no
1606 fi
1607 rm -f conftest*])
1608 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1609 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1611 AC_CACHE_CHECK(whether cc puts quotes around section names,
1612 libc_cv_have_section_quotes,
1613 [cat > conftest.c <<EOF
1614 static const int foo
1615 __attribute__ ((section ("bar"))) = 1;
1616 EOF
1617 if ${CC-cc} -S conftest.c -o conftest.s; then
1618 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1619 libc_cv_have_section_quotes=yes
1620 else
1621 libc_cv_have_section_quotes=no
1622 fi
1623 else
1624 libc_cv_have_section_quotes=unknown
1625 fi
1626 rm -f conftest.{c,s}
1627 ])
1628 if test $libc_cv_have_section_quotes = yes; then
1629 AC_DEFINE(HAVE_SECTION_QUOTES)
1630 fi
1632 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1633 cat > conftest.c <<\EOF
1634 void zero (void *x)
1635 {
1636 __builtin_memset (x, 0, 1000);
1637 }
1638 EOF
1639 dnl
1640 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
1641 then
1642 libc_cv_gcc_builtin_memset=no
1643 else
1644 libc_cv_gcc_builtin_memset=yes
1645 fi
1646 rm -f conftest* ])
1647 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1648 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1649 fi
1651 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1652 cat > conftest.c <<\EOF
1653 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1654 char *foo (const char *a, const char *b)
1655 {
1656 return __builtin_strstr (a, b);
1657 }
1658 EOF
1659 dnl
1660 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
1661 then
1662 libc_cv_gcc_builtin_redirection=yes
1663 else
1664 libc_cv_gcc_builtin_redirection=no
1665 fi
1666 rm -f conftest* ])
1667 if test "$libc_cv_gcc_builtin_redirection" = no; then
1668 AC_MSG_ERROR([support for the symbol redirection needed])
1669 fi
1671 dnl Determine how to disable generation of FMA instructions.
1672 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1673 libc_cv_cc_nofma, [dnl
1674 libc_cv_cc_nofma=
1675 for opt in -ffp-contract=off -mno-fused-madd; do
1676 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1677 done])
1678 AC_SUBST(libc_cv_cc_nofma)
1680 if test -n "$submachine"; then
1681 AC_CACHE_CHECK([for compiler option for CPU variant],
1682 libc_cv_cc_submachine, [dnl
1683 libc_cv_cc_submachine=no
1684 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1685 LIBC_TRY_CC_OPTION([$opt], [
1686 libc_cv_cc_submachine="$opt"
1687 break], [])
1688 done])
1689 if test "x$libc_cv_cc_submachine" = xno; then
1690 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1691 fi
1692 fi
1693 AC_SUBST(libc_cv_cc_submachine)
1695 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1696 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1697 cat > conftest.c <<EOF
1698 void
1699 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1700 foo (void) {}
1701 EOF
1702 libc_cv_cc_loop_to_function=no
1703 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1704 then
1705 libc_cv_cc_loop_to_function=yes
1706 fi
1707 rm -f conftest*])
1708 if test $libc_cv_cc_loop_to_function = yes; then
1709 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1710 fi
1711 AC_SUBST(libc_cv_cc_loop_to_function)
1713 dnl Check whether we have the gd library available.
1714 AC_MSG_CHECKING(for libgd)
1715 if test "$with_gd" != "no"; then
1716 old_CFLAGS="$CFLAGS"
1717 CFLAGS="$CFLAGS $libgd_include"
1718 old_LDFLAGS="$LDFLAGS"
1719 LDFLAGS="$LDFLAGS $libgd_ldflags"
1720 old_LIBS="$LIBS"
1721 LIBS="$LIBS -lgd -lpng -lz -lm"
1722 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1723 CFLAGS="$old_CFLAGS"
1724 LDFLAGS="$old_LDFLAGS"
1725 LIBS="$old_LIBS"
1726 else
1727 LIBGD=no
1728 fi
1729 AC_MSG_RESULT($LIBGD)
1730 AC_SUBST(LIBGD)
1732 # SELinux detection
1733 if test x$with_selinux = xno ; then
1734 have_selinux=no;
1735 else
1736 # See if we have the SELinux library
1737 AC_CHECK_LIB(selinux, is_selinux_enabled,
1738 have_selinux=yes, have_selinux=no)
1739 if test x$with_selinux = xyes ; then
1740 if test x$have_selinux = xno ; then
1741 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1742 fi
1743 fi
1744 fi
1745 # Check if we're building with SELinux support.
1746 if test "x$have_selinux" = xyes; then
1747 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1749 # See if we have the libaudit library
1750 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1751 have_libaudit=yes, have_libaudit=no)
1752 if test "x$have_libaudit" = xyes; then
1753 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1754 fi
1755 AC_SUBST(have_libaudit)
1757 # See if we have the libcap library
1758 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1759 if test "x$have_libcap" = xyes; then
1760 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1761 fi
1762 AC_SUBST(have_libcap)
1763 fi
1764 AC_SUBST(have_selinux)
1766 CPPUNDEFS=
1767 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1768 dnl Since we are building the implementations of the fortified functions here,
1769 dnl having the macro defined interacts very badly.
1770 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1771 [AC_TRY_COMPILE([], [
1772 #ifdef _FORTIFY_SOURCE
1773 # error bogon
1774 #endif],
1775 [libc_cv_predef_fortify_source=no],
1776 [libc_cv_predef_fortify_source=yes])])
1777 if test $libc_cv_predef_fortify_source = yes; then
1778 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1779 fi
1780 AC_SUBST(CPPUNDEFS)
1782 # Some linkers on some architectures support __ehdr_start but with
1783 # bugs. Make sure usage of it does not create relocations in the
1784 # output (as the linker should resolve them all for us).
1785 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1786 libc_cv_ehdr_start, [
1787 old_CFLAGS="$CFLAGS"
1788 old_LDFLAGS="$LDFLAGS"
1789 old_LIBS="$LIBS"
1790 CFLAGS="$CFLAGS -fPIC"
1791 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1792 LIBS=
1793 AC_LINK_IFELSE([AC_LANG_SOURCE([
1794 typedef struct {
1795 char foo;
1796 long val;
1797 } Ehdr;
1798 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1799 long ehdr (void) { return __ehdr_start.val; }
1800 ])],
1801 [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
1802 libc_cv_ehdr_start=broken
1803 else
1804 libc_cv_ehdr_start=yes
1805 fi], [libc_cv_ehdr_start=no])
1806 CFLAGS="$old_CFLAGS"
1807 LDFLAGS="$old_LDFLAGS"
1808 LIBS="$old_LIBS"
1809 ])
1810 if test "$libc_cv_ehdr_start" = yes; then
1811 AC_DEFINE([HAVE_EHDR_START])
1812 elif test "$libc_cv_ehdr_start" = broken; then
1813 AC_MSG_WARN([linker is broken -- you should upgrade])
1814 fi
1816 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1817 libc_cv_builtin_trap, [dnl
1818 libc_cv_builtin_trap=no
1819 AC_TRY_COMPILE([], [__builtin_trap ()], [
1820 libc_undefs=`$NM -u conftest.o |
1821 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1822 2>&AS_MESSAGE_LOG_FD` || {
1823 AC_MSG_ERROR([confusing output from $NM -u])
1824 }
1825 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1826 if test -z "$libc_undefs"; then
1827 libc_cv_builtin_trap=yes
1828 fi])])
1829 if test $libc_cv_builtin_trap = yes; then
1830 AC_DEFINE([HAVE_BUILTIN_TRAP])
1831 fi
1833 dnl C++ feature tests.
1834 AC_LANG_PUSH([C++])
1836 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1837 libc_cv_cxx_thread_local, [
1838 old_CXXFLAGS="$CXXFLAGS"
1839 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1840 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1841 #include <thread>
1843 // Compiler support.
1844 struct S
1845 {
1846 S ();
1847 ~S ();
1848 };
1849 thread_local S s;
1850 S * get () { return &s; }
1852 // libstdc++ support.
1853 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1854 #error __cxa_thread_atexit_impl not supported
1855 #endif
1856 ])],
1857 [libc_cv_cxx_thread_local=yes],
1858 [libc_cv_cxx_thread_local=no])
1859 CXXFLAGS="$old_CXXFLAGS"
1860 ])
1861 AC_SUBST(libc_cv_cxx_thread_local)
1863 AC_LANG_POP([C++])
1864 dnl End of C++ feature tests.
1866 ### End of automated tests.
1867 ### Now run sysdeps configure fragments.
1869 # They also can set these variables.
1870 use_ldconfig=no
1871 ldd_rewrite_script=no
1872 libc_cv_sysconfdir=$sysconfdir
1873 libc_cv_localstatedir=$localstatedir
1874 libc_cv_gcc_unwind_find_fde=no
1875 libc_cv_idn=no
1877 # Iterate over all the sysdep directories we will use, running their
1878 # configure fragments.
1879 for dir in $sysnames; do
1880 case $dir in
1881 /*) dest=$dir ;;
1882 *) dest=$srcdir/$dir ;;
1883 esac
1884 if test -r $dest/configure; then
1885 AC_MSG_RESULT(running configure fragment for $dir)
1886 . $dest/configure
1887 fi
1888 done
1890 if test x"$build_mathvec" = xnotset; then
1891 build_mathvec=no
1892 fi
1893 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1895 AC_SUBST(libc_extra_cflags)
1896 AC_SUBST(libc_extra_cppflags)
1898 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1899 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1900 fi
1901 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1903 # A sysdeps configure fragment can reset this if IFUNC is not actually
1904 # usable even though the assembler knows how to generate the symbol type.
1905 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1906 AC_DEFINE(HAVE_IFUNC)
1907 fi
1909 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1910 AC_DEFINE(HAVE_GCC_IFUNC)
1911 fi
1913 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1914 # configure fragment can override the value to prevent this AC_DEFINE.
1915 AC_SUBST(use_nscd)
1916 if test "x$use_nscd" != xno; then
1917 AC_DEFINE([USE_NSCD])
1918 fi
1919 if test "x$build_nscd" = xdefault; then
1920 build_nscd=$use_nscd
1921 fi
1923 AC_SUBST(libc_cv_slibdir)
1924 AC_SUBST(libc_cv_rtlddir)
1925 AC_SUBST(libc_cv_complocaledir)
1926 AC_SUBST(libc_cv_sysconfdir)
1927 AC_SUBST(libc_cv_localstatedir)
1928 AC_SUBST(libc_cv_rootsbindir)
1930 if test x$use_ldconfig = xyes; then
1931 AC_DEFINE(USE_LDCONFIG)
1932 fi
1933 AC_SUBST(use_ldconfig)
1934 AC_SUBST(ldd_rewrite_script)
1936 AC_SUBST(static)
1937 AC_SUBST(shared)
1939 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1940 [libc_cv_pic_default=yes
1941 cat > conftest.c <<EOF
1942 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1943 # error PIC is default.
1944 #endif
1945 EOF
1946 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1947 libc_cv_pic_default=no
1948 fi
1949 rm -f conftest.*])
1950 AC_SUBST(libc_cv_pic_default)
1952 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1953 [libc_cv_pie_default=yes
1954 cat > conftest.c <<EOF
1955 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1956 # error PIE is default.
1957 #endif
1958 EOF
1959 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1960 libc_cv_pie_default=no
1961 fi
1962 rm -f conftest.*])
1963 AC_SUBST(libc_cv_pie_default)
1965 AC_SUBST(profile)
1966 AC_SUBST(static_nss)
1968 AC_SUBST(DEFINES)
1970 dnl See sysdeps/mach/configure.ac for this variable.
1971 AC_SUBST(mach_interface_list)
1973 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1974 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1975 AC_SUBST(VERSION)
1976 AC_SUBST(RELEASE)
1978 AC_CONFIG_FILES([config.make Makefile])
1979 AC_CONFIG_COMMANDS([default],[[
1980 case $CONFIG_FILES in *config.make*)
1981 echo "$config_vars" >> config.make;;
1982 esac
1983 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1984 AC_OUTPUT