| blob | 4a77411b71949771233cea4b525f95bf446f3dc1 |
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([nss-crypt],
317 AC_HELP_STRING([--enable-nss-crypt],
318 [enable libcrypt to use nss]),
319 [nss_crypt=$enableval],
320 [nss_crypt=no])
321 if test x$nss_crypt = xyes; then
322 nss_includes=-I$(nss-config --includedir 2>/dev/null)
323 if test $? -ne 0; then
324 AC_MSG_ERROR([cannot find include directory with nss-config])
325 fi
326 old_CFLAGS="$CFLAGS"
327 CFLAGS="$CFLAGS $nss_includes"
328 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
329 #include <hasht.h>
330 #include <nsslowhash.h>
331 void f (void) { NSSLOW_Init (); }])],
332 libc_cv_nss_crypt=yes,
333 AC_MSG_ERROR([
334 cannot find NSS headers with lowlevel hash function interfaces]))
335 old_LIBS="$LIBS"
336 old_LDFLAGS="$LDFLAGS"
337 LIBS="$LIBS -lfreebl3"
338 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
339 #include <hasht.h>
340 #include <nsslowhash.h>],
341 [NSSLOW_Init();])],
342 libc_cv_nss_crypt=yes,
343 AC_MSG_ERROR([
344 cannot link program using lowlevel NSS hash functions]))
345 # Check to see if there is a static NSS cryptographic library.
346 # If there isn't then we can't link anything with libcrypt.a,
347 # and that might mean disabling some static tests.
348 LDFLAGS="$LDFLAGS -static"
349 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
350 #include <hasht.h>
351 #include <nsslowhash.h>],
352 [NSSLOW_Init();])],
353 libc_cv_static_nss_crypt=yes,
354 libc_cv_static_nss_crypt=no)
355 LDFLAGS="$old_LDFLAGS"
356 CFLAGS="$old_CFLAGS"
357 LIBS="$old_LIBS"
358 else
359 libc_cv_nss_crypt=no
360 libc_cv_static_nss_crypt=no
361 fi
362 AC_SUBST(libc_cv_nss_crypt)
363 AC_SUBST(libc_cv_static_nss_crypt)
366 AC_ARG_ENABLE([obsolete-rpc],
367 AC_HELP_STRING([--enable-obsolete-rpc],
368 [build and install the obsolete RPC code for link-time usage]),
369 [link_obsolete_rpc=$enableval],
370 [link_obsolete_rpc=no])
371 AC_SUBST(link_obsolete_rpc)
373 if test "$link_obsolete_rpc" = yes; then
374 AC_DEFINE(LINK_OBSOLETE_RPC)
375 fi
377 AC_ARG_ENABLE([systemtap],
378 [AS_HELP_STRING([--enable-systemtap],
379 [enable systemtap static probe points @<:@default=no@:>@])],
380 [systemtap=$enableval],
381 [systemtap=no])
382 if test "x$systemtap" != xno; then
383 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
384 old_CFLAGS="$CFLAGS"
385 CFLAGS="-std=gnu11 $CFLAGS"
386 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
387 void foo (int i, void *p)
388 {
389 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
390 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
391 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
392 CFLAGS="$old_CFLAGS"])
393 if test $libc_cv_sdt = yes; then
394 AC_DEFINE([USE_STAP_PROBE])
395 elif test "x$systemtap" != xauto; then
396 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
397 fi
398 fi
400 AC_ARG_ENABLE([build-nscd],
401 [AS_HELP_STRING([--disable-build-nscd],
402 [disable building and installing the nscd daemon])],
403 [build_nscd=$enableval],
404 [build_nscd=default])
405 AC_SUBST(build_nscd)
407 # Note the use of $use_nscd is near the bottom of the file.
408 AC_ARG_ENABLE([nscd],
409 [AS_HELP_STRING([--disable-nscd],
410 [library functions will not contact the nscd daemon])],
411 [use_nscd=$enableval],
412 [use_nscd=yes])
414 AC_ARG_ENABLE([pt_chown],
415 [AS_HELP_STRING([--enable-pt_chown],
416 [Enable building and installing pt_chown])],
417 [build_pt_chown=$enableval],
418 [build_pt_chown=no])
419 AC_SUBST(build_pt_chown)
420 if test "$build_pt_chown" = yes; then
421 AC_DEFINE(HAVE_PT_CHOWN)
422 fi
424 AC_ARG_ENABLE([tunables],
425 [AS_HELP_STRING([--enable-tunables],
426 [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
427 [have_tunables=$enableval],
428 [have_tunables=no])
429 AC_SUBST(have_tunables)
430 if test "$have_tunables" = yes; then
431 AC_DEFINE(HAVE_TUNABLES)
432 fi
434 # The abi-tags file uses a fairly simplistic model for name recognition that
435 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
436 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
437 # This doesn't get used much beyond that, so it's fairly safe.
438 case "$host_os" in
439 linux*)
440 ;;
441 gnu*)
442 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
443 ;;
444 esac
446 AC_ARG_ENABLE([mathvec],
447 [AS_HELP_STRING([--enable-mathvec],
448 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
449 [build_mathvec=$enableval],
450 [build_mathvec=notset])
452 # We keep the original values in `$config_*' and never modify them, so we
453 # can write them unchanged into config.make. Everything else uses
454 # $machine, $vendor, and $os, and changes them whenever convenient.
455 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
457 # Don't allow vendor == "unknown"
458 test "$config_vendor" = unknown && config_vendor=
459 config_os="`echo $config_os | sed 's/^unknown-//'`"
461 # Some configurations imply other options.
462 elf=yes
464 # The configure fragment of an add-on port can modify these to supplement
465 # or override the table in the case statement below. No fragment should
466 # ever change the config_* variables, however.
467 machine=$config_machine
468 vendor=$config_vendor
469 os=$config_os
470 base_os=''
472 submachine=
473 AC_ARG_WITH([cpu],
474 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
475 [dnl
476 case "$withval" in
477 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
478 no) ;;
479 *) submachine="$withval" ;;
480 esac
481 ])
483 # An preconfigure script can set this when it wants to disable the sanity
484 # check below.
485 libc_config_ok=no
487 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
488 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
490 dnl Having this here, though empty, makes sure that if add-ons' fragments
491 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
492 dnl our AC_OUTPUT will actually use it.
493 AC_CONFIG_SUBDIRS()
495 case "$enable_add_ons" in
496 ''|no) add_ons= ;;
497 yes|'*')
498 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
499 sed 's@/[[^/]]*$@@' | sort | uniq`
500 add_ons_automatic=yes
501 ;;
502 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
503 add_ons_automatic=no ;;
504 esac
506 configured_add_ons=
507 add_ons_sfx=
508 add_ons_pfx=
509 if test x"$add_ons" != x; then
510 for f in $add_ons; do
511 # Some sanity checks
512 case "$f" in
513 crypt)
514 AC_MSG_ERROR([
515 *** It seems that you're using an old \`crypt' add-on. crypt is now
516 *** part of glibc and using the old add-on will not work with this
517 *** release. Start again with fresh sources and without the old
518 *** \`crypt' add-on.])
519 ;;
520 localedata)
521 AC_MSG_ERROR([
522 *** It seems that you're using an old \`localedata' add-on. localedata
523 *** is now part of glibc and using the old add-on will not work with
524 *** this release. Start again with fresh sources and without the old
525 *** \`localedata' add-on.])
526 ;;
527 esac
528 done
530 # Now source each add-on's configure fragment.
531 # The fragments can use $srcdir/$libc_add_on to find themselves,
532 # and test $add_ons_automatic to see if they were explicitly requested.
533 # A fragment can clear (or even change) $libc_add_on to affect
534 # whether it goes into the list to be actually used in the build.
535 use_add_ons=
536 for libc_add_on in $add_ons; do
537 # Test whether such a directory really exists.
538 # It can be absolute, or relative to $srcdir, or relative to the build dir.
539 case "$libc_add_on" in
540 /*)
541 libc_add_on_srcdir=$libc_add_on
542 ;;
543 *)
544 test -d "$srcdir/$libc_add_on" || {
545 if test -d "$libc_add_on"; then
546 libc_add_on="`pwd`/$libc_add_on"
547 else
548 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
549 fi
550 }
551 libc_add_on_srcdir=$srcdir/$libc_add_on
552 ;;
553 esac
555 libc_add_on_frag=$libc_add_on_srcdir/configure
556 libc_add_on_canonical=
557 libc_add_on_config_subdirs=
558 if test -r "$libc_add_on_frag"; then
559 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
560 libc_add_on_canonical=unknown
561 libc_add_on_subdirs=
562 . "$libc_add_on_frag"
563 test -z "$libc_add_on" || {
564 configured_add_ons="$configured_add_ons $libc_add_on"
565 if test "x$libc_add_on_canonical" = xunknown; then
566 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
567 fi
568 for d in $libc_add_on_subdirs; do
569 case "$libc_add_on" in
570 /*) subdir_srcdir="$libc_add_on" ;;
571 *) subdir_srcdir="\$(..)$libc_add_on" ;;
572 esac
573 case "$d" in
574 .)
575 d="${libc_add_on_canonical:-$libc_add_on}"
576 ;;
577 /*)
578 subdir_srcdir="$d"
579 ;;
580 *)
581 subdir_srcdir="$subdir_srcdir/$d"
582 ;;
583 esac
584 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
585 add_on_subdirs="$add_on_subdirs $d"
586 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
587 $d-srcdir = $subdir_srcdir"
588 done
589 for d in $libc_add_on_config_subdirs; do
590 case "$d" in
591 /*) AC_MSG_ERROR(dnl
592 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
593 esac
594 if test ! -d "$libc_add_on_srcdir/$d"; then
595 AC_MSG_ERROR(fragment wants to configure missing directory $d)
596 fi
597 case "$libc_add_on" in
598 /*) AC_MSG_ERROR(dnl
599 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
600 esac
601 subdirs="$subdirs $libc_add_on/$d"
602 done
603 }
604 fi
605 if test -n "$libc_add_on"; then
606 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
607 use_add_ons="$use_add_ons $libc_add_on"
608 add_ons_pfx="$add_ons_pfx $libc_add_on/"
609 test -z "$libc_add_on_canonical" ||
610 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
611 fi
612 done
613 # Use echo to strip excess whitespace.
614 add_ons="`echo $use_add_ons`"
615 fi
616 AC_SUBST(add_ons)
617 AC_SUBST(add_on_subdirs)
620 ###
621 ### By using the undocumented --enable-hacker-mode option for configure
622 ### one can skip this test to make the configuration not fail for unsupported
623 ### platforms.
624 ###
625 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
626 case "$machine-$host_os" in
627 *-linux* | *-gnu*)
628 ;;
629 *)
630 AC_MSG_ERROR([
631 *** The GNU C library is currently unavailable for this platform.
632 *** If you are interested in seeing glibc on this platform visit
633 *** the "How to submit a new port" in the wiki:
634 *** https://sourceware.org/glibc/wiki/#Development
635 *** and join the community!])
636 ;;
637 esac
638 fi
640 # Set base_machine if not set by a preconfigure fragment.
641 test -n "$base_machine" || base_machine=$machine
642 AC_SUBST(base_machine)
644 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
645 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
646 [libc_cv_ssp=yes],
647 [libc_cv_ssp=no])
648 ])
650 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
651 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
652 [libc_cv_ssp_strong=yes],
653 [libc_cv_ssp_strong=no])
654 ])
656 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
657 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
658 [libc_cv_ssp_all=yes],
659 [libc_cv_ssp_all=no])
660 ])
662 stack_protector=
663 no_stack_protector=
664 if test "$libc_cv_ssp" = yes; then
665 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
666 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
667 fi
669 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
670 stack_protector="-fstack-protector"
671 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
672 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
673 stack_protector="-fstack-protector-all"
674 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
675 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
676 stack_protector="-fstack-protector-strong"
677 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
678 else
679 stack_protector="-fno-stack-protector"
680 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
681 fi
682 AC_SUBST(libc_cv_ssp)
683 AC_SUBST(stack_protector)
684 AC_SUBST(no_stack_protector)
686 if test -n "$stack_protector"; then
687 dnl Don't run configure tests with stack-protection on, to avoid problems with
688 dnl bootstrapping.
689 no_ssp=-fno-stack-protector
690 else
691 no_ssp=
693 if test "$enable_stack_protector" != no; then
694 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
695 fi
696 fi
698 # For the multi-arch option we need support in the assembler & linker.
699 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
700 libc_cv_ld_gnu_indirect_function, [dnl
701 cat > conftest.S <<EOF
702 .type foo,%gnu_indirect_function
703 foo:
704 .globl _start
705 _start:
706 .globl __start
707 __start:
708 .data
709 #ifdef _LP64
710 .quad foo
711 #else
712 .long foo
713 #endif
714 EOF
715 libc_cv_ld_gnu_indirect_function=no
716 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
717 -nostartfiles -nostdlib $no_ssp \
718 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
719 # Do a link to see if the backend supports IFUNC relocs.
720 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
721 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
722 libc_cv_ld_gnu_indirect_function=yes
723 }
724 fi
725 rm -f conftest*])
727 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
728 AC_CACHE_CHECK([for gcc attribute ifunc support],
729 libc_cv_gcc_indirect_function, [dnl
730 cat > conftest.c <<EOF
731 extern int func (int);
732 int used_func (int a)
733 {
734 return a;
735 }
736 static void *resolver ()
737 {
738 return &used_func;
739 }
740 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
741 EOF
742 libc_cv_gcc_indirect_function=no
743 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
744 2>&AS_MESSAGE_LOG_FD ; then
745 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
746 libc_cv_gcc_indirect_function=yes
747 fi
748 fi
749 rm -f conftest*])
751 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
752 if test x"$multi_arch" = xyes; then
753 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
754 else
755 multi_arch=no
756 fi
757 fi
758 if test x"$libc_cv_gcc_indirect_function" != xyes &&
759 test x"$multi_arch" = xyes; then
760 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
761 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
762 fi
763 multi_arch_d=
764 if test x"$multi_arch" != xno; then
765 multi_arch_d=/multiarch
766 fi
768 # Compute the list of sysdep directories for this configuration.
769 # This can take a while to compute.
770 sysdep_dir=$srcdir/sysdeps
771 AC_MSG_CHECKING(sysdep dirs)
772 dnl We need to use [ and ] for other purposes for a while now.
773 changequote(,)dnl
774 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
775 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
777 test "x$base_os" != x || case "$os" in
778 gnu*)
779 base_os=mach/hurd ;;
780 linux*)
781 base_os=unix/sysv ;;
782 esac
784 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
785 tail=$os
786 ostry=$os
787 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
788 ostry="$ostry /$o"
789 tail=$o
790 done
791 o=`echo $tail | sed 's/[0-9]*$//'`
792 if test $o != $tail; then
793 ostry="$ostry /$o"
794 fi
795 # For linux-gnu, try linux-gnu, then linux.
796 o=`echo $tail | sed 's/-.*$//'`
797 if test $o != $tail; then
798 ostry="$ostry /$o"
799 fi
801 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
802 base=
803 tail=$base_os
804 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
805 set $b
806 base="$base /$1"
807 tail="$2"
808 done
810 # For sparc/sparc32, try sparc/sparc32 and then sparc.
811 mach=
812 tail=$machine${submachine:+/$submachine}
813 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
814 set $m
815 # Prepend the machine's FPU directory unless --without-fp.
816 if test "$with_fp" = yes; then
817 maybe_fpu=/fpu
818 else
819 maybe_fpu=/nofpu
820 fi
821 # For each machine term, try it with and then without /multiarch.
822 for try_fpu in $maybe_fpu ''; do
823 for try_multi in $multi_arch_d ''; do
824 mach="$mach /$1$try_fpu$try_multi"
825 done
826 done
827 tail="$2"
828 done
830 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
831 changequote([,])dnl
833 # Find what sysdep directories exist.
834 sysnames_add_ons=
835 sysnames=
836 for b in $base ''; do
837 for m0 in $mach ''; do
838 for v in /$vendor ''; do
839 test "$v" = / && continue
840 for o in /$ostry ''; do
841 test "$o" = / && continue
842 for m in $mach ''; do
843 for d in $add_ons_pfx ''; do
844 for a in $add_ons_sfx ''; do
845 try_suffix="$m0$b$v$o$m"
846 if test -n "$try_suffix"; then
847 try_srcdir="${srcdir}/"
848 case "$d" in
849 /*) try_srcdir= ;;
850 esac
851 try="${d}sysdeps$try_suffix$a"
852 test -n "$enable_debug_configure" &&
853 echo "$0 [DEBUG]: try $try" >&2
854 if test -d "$try_srcdir$try"; then
855 sysnames="$sysnames $try"
856 { test -n "$o" || test -n "$b"; } && os_used=t
857 { test -n "$m" || test -n "$m0"; } && machine_used=t
858 case x${m0:-$m} in
859 x*/$submachine) submachine_used=t ;;
860 esac
861 if test -n "$d"; then
862 case "$sysnames_add_ons" in
863 *" $d "*) ;;
864 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
865 esac
866 fi
867 fi
868 fi
869 done
870 done
871 done
872 done
873 done
874 done
875 done
877 # If the assembler supports gnu_indirect_function symbol type and the
878 # architecture supports multi-arch, we enable multi-arch by default.
879 case $sysnames_add_ons$sysnames in
880 *"$multi_arch_d"*)
881 ;;
882 *)
883 test x"$multi_arch" = xdefault && multi_arch=no
884 ;;
885 esac
886 if test x"$multi_arch" != xno; then
887 AC_DEFINE(USE_MULTIARCH)
888 fi
889 AC_SUBST(multi_arch)
891 if test -z "$os_used" && test "$os" != none; then
892 AC_MSG_ERROR(Operating system $os is not supported.)
893 fi
894 if test -z "$machine_used" && test "$machine" != none; then
895 AC_MSG_ERROR(The $machine is not supported.)
896 fi
897 if test -z "$submachine_used" && test -n "$submachine"; then
898 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
899 fi
900 AC_SUBST(submachine)
902 # We have now validated the configuration.
904 # Expand the list of system names into a full list of directories
905 # from each element's parent name and Implies file (if present).
906 set $sysnames
907 names=
908 while test $# -gt 0; do
909 name=$1
910 shift
912 case " $names " in *" $name "*)
913 # Already in the list.
914 continue
915 esac
917 # Report each name as we discover it, so there is no long pause in output.
918 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
920 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
922 case $name in
923 /*) xsrcdir= ;;
924 *) xsrcdir=$srcdir/ ;;
925 esac
926 test -n "$enable_debug_configure" &&
927 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
929 for implies_file in Implies Implies-before Implies-after; do
930 implies_type=`echo $implies_file | sed s/-/_/`
931 eval ${implies_type}=
932 if test -f $xsrcdir$name/$implies_file; then
933 # Collect more names from the `Implies' file (removing comments).
934 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
935 for x in $implied_candidate; do
936 found=no
937 if test -d $xsrcdir$name_base/$x; then
938 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
939 found=yes
940 fi
941 for d in $add_ons_pfx ''; do
942 try="${d}sysdeps/$x"
943 case $d in
944 /*) try_srcdir= ;;
945 *) try_srcdir=$srcdir/ ;;
946 esac
947 test -n "$enable_debug_configure" &&
948 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
949 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
950 then
951 eval "${implies_type}=\"\$${implies_type} \$try\""
952 found=yes
953 case "$sysnames_add_ons" in
954 *" $d "*) ;;
955 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
956 esac
957 fi
958 done
959 if test $found = no; then
960 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
961 fi
962 done
963 fi
964 done
966 # Add NAME to the list of names.
967 names="$names $name"
969 # Find the parent of NAME, using the empty string if it has none.
970 changequote(,)dnl
971 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
972 changequote([,])dnl
974 test -n "$enable_debug_configure" &&
975 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
976 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
978 # Add the names implied by NAME, and NAME's parent (if it has one), to
979 # the list of names to be processed (the argument list). We prepend the
980 # implied names to the list and append the parent. We want implied
981 # directories to come before further directories inferred from the
982 # configuration components; this ensures that for sysv4, unix/common
983 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
984 # after sysv4).
985 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
986 test -n "$sysnames" && set $sysnames
987 done
989 # Add the default directories.
990 default_sysnames="sysdeps/generic"
991 sysnames="$names $default_sysnames"
992 AC_SUBST(sysnames)
993 # The other names were emitted during the scan.
994 AC_MSG_RESULT($default_sysnames)
996 # Collect the list of add-ons that supply partial sysdeps trees.
997 sysdeps_add_ons=
998 for add_on in $add_ons; do
999 case "$add_on" in
1000 /*) xsrcdir= ;;
1001 *) xsrcdir="$srcdir/" ;;
1002 esac
1004 test -d "$xsrcdir$add_on/sysdeps" || {
1005 case "$configured_add_ons " in
1006 *" $add_on "*) ;;
1007 *|'')
1008 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
1009 ;;
1010 esac
1011 continue
1012 }
1014 sysdeps_add_ons="$sysdeps_add_ons $add_on"
1015 case "$sysnames_add_ons" in
1016 *" $add_on/ "*) ;;
1017 *|'')
1018 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
1019 continue ;;
1020 esac
1022 found=no
1023 for d in $sysnames; do
1024 case "$d" in
1025 $add_on/sysdeps/*) ;;
1026 *) continue ;;
1027 esac
1028 (cd "$xsrcdir$d" && for f in *[[!~]]; do
1029 case "$f" in
1030 sys|bits)
1031 for ff in $f/*.h; do
1032 test -d "$ff" || { test -e "$ff" && exit 88; }
1033 done
1034 ;;
1035 *)
1036 test -d "$f" || { test -e "$f" && exit 88; }
1037 ;;
1038 esac
1039 done)
1040 if test $? -eq 88; then
1041 found=yes
1042 break
1043 fi
1044 done
1045 if test $found = no; then
1046 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
1047 fi
1048 done
1049 AC_SUBST(sysdeps_add_ons)
1052 ### Locate tools.
1054 AC_PROG_INSTALL
1055 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
1056 # The makefiles need to use a different form to find it in $srcdir.
1057 INSTALL='\$(..)./scripts/install-sh -c'
1058 fi
1059 AC_PROG_LN_S
1061 LIBC_PROG_BINUTILS
1063 # Accept binutils 2.22 or newer.
1064 AC_CHECK_PROG_VER(AS, $AS, --version,
1065 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
1066 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1067 AS=: critic_missing="$critic_missing as")
1068 AC_CHECK_PROG_VER(LD, $LD, --version,
1069 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
1070 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1071 LD=: critic_missing="$critic_missing ld")
1073 # These programs are version sensitive.
1074 AC_CHECK_TOOL_PREFIX
1075 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1076 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1077 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1079 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1080 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1081 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1082 MSGFMT=: aux_missing="$aux_missing msgfmt")
1083 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1084 [GNU texinfo.* \([0-9][0-9.]*\)],
1085 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1086 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1087 AC_CHECK_PROG_VER(SED, sed, --version,
1088 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1089 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1090 SED=: aux_missing="$aux_missing sed")
1091 AC_CHECK_PROG_VER(AWK, gawk, --version,
1092 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1093 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1095 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1096 AC_TRY_COMPILE([], [
1097 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
1098 #error insufficient compiler
1099 #endif],
1100 [libc_cv_compiler_ok=yes],
1101 [libc_cv_compiler_ok=no])])
1102 AS_IF([test $libc_cv_compiler_ok != yes],
1103 [critic_missing="$critic_missing compiler"])
1105 AC_CHECK_TOOL(NM, nm, false)
1107 if test "x$maintainer" = "xyes"; then
1108 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1109 case "x$AUTOCONF" in
1110 xno|x|x:) AUTOCONF=no ;;
1111 *)
1112 AC_CACHE_CHECK(dnl
1113 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1114 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1115 libc_cv_autoconf_works=yes
1116 else
1117 libc_cv_autoconf_works=no
1118 fi])
1119 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1120 ;;
1121 esac
1122 if test "x$AUTOCONF" = xno; then
1123 aux_missing="$aux_missing autoconf"
1124 fi
1125 else
1126 AUTOCONF=no
1127 fi
1129 # Check for python3 if available, or else python.
1130 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1131 case "x$PYTHON_PROG" in
1132 xno|x|x:) PYTHON_PROG=no ;;
1133 *) ;;
1134 esac
1136 if test "x$PYTHON_PROG" = xno; then
1137 aux_missing="$aux_missing python"
1138 else
1139 PYTHON="$PYTHON_PROG -B"
1140 AC_SUBST(PYTHON)
1141 fi
1143 test -n "$critic_missing" && AC_MSG_ERROR([
1144 *** These critical programs are missing or too old:$critic_missing
1145 *** Check the INSTALL file for required versions.])
1147 test -n "$aux_missing" && AC_MSG_WARN([
1148 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1149 *** some features or tests will be disabled.
1150 *** Check the INSTALL file for required versions.])
1152 # if using special system headers, find out the compiler's sekrit
1153 # header directory and add that to the list. NOTE: Only does the right
1154 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1155 if test -n "$sysheaders"; then
1156 SYSINCLUDES=-nostdinc
1157 for d in include include-fixed; do
1158 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1159 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1160 done
1161 SYSINCLUDES="$SYSINCLUDES \
1162 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1163 if test -n "$CXX"; then
1164 CXX_SYSINCLUDES=
1165 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1166 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1167 test "x$cxxheaders" != x &&
1168 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1169 done
1170 fi
1171 fi
1172 AC_SUBST(SYSINCLUDES)
1173 AC_SUBST(CXX_SYSINCLUDES)
1175 # Obtain some C++ header file paths. This is used to make a local
1176 # copy of those headers in Makerules.
1177 if test -n "$CXX"; then
1178 find_cxx_header () {
1179 echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}"
1180 }
1181 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1182 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1183 fi
1184 AC_SUBST(CXX_CSTDLIB_HEADER)
1185 AC_SUBST(CXX_CMATH_HEADER)
1187 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1188 # since this would lead to problems installing/building glibc.
1189 # LD_LIBRARY_PATH contains the current directory if one of the following
1190 # is true:
1191 # - one of the terminals (":" and ";") is the first or last sign
1192 # - two terminals occur directly after each other
1193 # - the path contains an element with a dot in it
1194 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1195 changequote(,)dnl
1196 case ${LD_LIBRARY_PATH} in
1197 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1198 ld_library_path_setting="contains current directory"
1199 ;;
1200 *)
1201 ld_library_path_setting="ok"
1202 ;;
1203 esac
1204 changequote([,])dnl
1205 AC_MSG_RESULT($ld_library_path_setting)
1206 if test "$ld_library_path_setting" != "ok"; then
1207 AC_MSG_ERROR([
1208 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1209 *** building glibc. Please change the environment variable
1210 *** and run configure again.])
1211 fi
1213 AC_PATH_PROG(BASH_SHELL, bash, no)
1215 AC_PATH_PROG(PERL, perl, no)
1216 if test "$PERL" != no &&
1217 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1218 PERL=no
1219 fi
1220 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1221 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1222 AC_CHECK_PROG_VER(BISON, bison, --version,
1223 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1224 [2.7*|[3-9].*|[1-9][0-9]*],
1225 BISON=no)
1227 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1228 cat > conftest.s <<EOF
1229 .text
1230 foo:
1231 .set glibc_conftest_frobozz,foo
1232 .globl glibc_conftest_frobozz
1233 EOF
1234 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1235 # (but it doesn't work), so we must do a linking check to be sure.
1236 cat > conftest1.c <<\EOF
1237 extern int glibc_conftest_frobozz;
1238 void _start() { glibc_conftest_frobozz = 1; }
1239 EOF
1240 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1241 -nostartfiles -nostdlib $no_ssp \
1242 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1243 libc_cv_asm_set_directive=yes
1244 else
1245 libc_cv_asm_set_directive=no
1246 fi
1247 rm -f conftest*])
1248 if test $libc_cv_asm_set_directive = yes; then
1249 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1250 fi
1252 AC_CACHE_CHECK(linker support for protected data symbol,
1253 libc_cv_protected_data,
1254 [cat > conftest.c <<EOF
1255 int bar __attribute__ ((visibility ("protected"))) = 1;
1256 EOF
1257 libc_cv_protected_data=no
1258 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1259 cat > conftest.c <<EOF
1260 extern int bar;
1261 int main (void) { return bar; }
1262 EOF
1263 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1264 libc_cv_protected_data=yes
1265 fi
1266 fi
1267 rm -f conftest.*
1268 ])
1269 AC_SUBST(libc_cv_protected_data)
1271 AC_CACHE_CHECK(for broken __attribute__((alias())),
1272 libc_cv_broken_alias_attribute,
1273 [cat > conftest.c <<EOF
1274 extern int foo (int x) __asm ("xyzzy");
1275 int bar (int x) { return x; }
1276 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1277 extern int dfoo;
1278 extern __typeof (dfoo) dfoo __asm ("abccb");
1279 int dfoo = 1;
1280 EOF
1281 libc_cv_broken_alias_attribute=yes
1282 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1283 if grep 'xyzzy' conftest.s >/dev/null &&
1284 grep 'abccb' conftest.s >/dev/null; then
1285 libc_cv_broken_alias_attribute=no
1286 fi
1287 fi
1288 rm -f conftest.c conftest.s
1289 ])
1290 if test $libc_cv_broken_alias_attribute = yes; then
1291 AC_MSG_ERROR(working alias attribute support required)
1292 fi
1294 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1295 libc_cv_have_sdata_section,
1296 [echo "int i;" > conftest.c
1297 libc_cv_have_sdata_section=no
1298 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1299 | grep '\.sdata' >/dev/null; then
1300 libc_cv_have_sdata_section=yes
1301 fi
1302 rm -f conftest.c conftest.so
1303 ])
1304 if test $libc_cv_have_sdata_section = yes; then
1305 AC_DEFINE(HAVE_SDATA_SECTION)
1306 fi
1308 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1309 libc_cv_ctors_header, [dnl
1310 libc_cv_ctors_header=yes
1311 LIBC_TRY_LINK_STATIC([
1312 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1313 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1314 ],
1315 [dnl
1316 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1317 { gsub(/\@<:@ */, "@<:@") }
1318 $2 == ".ctors" || $2 == ".dtors" {
1319 size = strtonum("0x" $6)
1320 align = strtonum("0x" $NF)
1321 seen@<:@$2@:>@ = 1
1322 stub@<:@$2@:>@ = size == align * 2
1323 }
1324 END {
1325 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1326 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1327 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1328 }
1329 '], [libc_cv_ctors_header=no])
1330 ], [dnl
1331 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1332 ])
1333 ])
1334 if test $libc_cv_ctors_header = no; then
1335 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1336 fi
1338 AC_CACHE_CHECK(for libunwind-support in compiler,
1339 libc_cv_cc_with_libunwind, [
1340 cat > conftest.c <<EOF
1341 int main (void) { return 0; }
1342 EOF
1343 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1344 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1345 libc_cv_cc_with_libunwind=yes
1346 else
1347 libc_cv_cc_with_libunwind=no
1348 fi
1349 rm -f conftest*])
1350 AC_SUBST(libc_cv_cc_with_libunwind)
1351 if test $libc_cv_cc_with_libunwind = yes; then
1352 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1353 fi
1355 ASFLAGS_config=
1356 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1357 libc_cv_as_noexecstack, [dnl
1358 cat > conftest.c <<EOF
1359 void foo (void) { }
1360 EOF
1361 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1362 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1363 && grep .note.GNU-stack conftest.s >/dev/null \
1364 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1365 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1366 then
1367 libc_cv_as_noexecstack=yes
1368 else
1369 libc_cv_as_noexecstack=no
1370 fi
1371 rm -f conftest*])
1372 if test $libc_cv_as_noexecstack = yes; then
1373 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1374 fi
1375 AC_SUBST(ASFLAGS_config)
1377 AC_CACHE_CHECK(for -z combreloc,
1378 libc_cv_z_combreloc, [dnl
1379 cat > conftest.c <<EOF
1380 extern int bar (int);
1381 extern int mumble;
1382 int foo (void) { return bar (mumble); }
1383 EOF
1384 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1385 -fPIC -shared $no_ssp -o conftest.so conftest.c
1386 -nostdlib -nostartfiles
1387 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1388 then
1389 dnl The following test is a bit weak. We must use a tool which can test
1390 dnl cross-platform since the gcc used can be a cross compiler. Without
1391 dnl introducing new options this is not easily doable. Instead use a tool
1392 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1393 dnl look for a section named .rel.dyn.
1394 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1395 libc_cv_z_combreloc=yes
1396 else
1397 libc_cv_z_combreloc=no
1398 fi
1399 else
1400 libc_cv_z_combreloc=no
1401 fi
1402 rm -f conftest*])
1403 if test "$libc_cv_z_combreloc" = yes; then
1404 AC_DEFINE(HAVE_Z_COMBRELOC)
1405 fi
1406 AC_SUBST(libc_cv_z_combreloc)
1408 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1409 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1410 AC_SUBST(libc_cv_z_execstack)
1412 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1413 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1414 ])
1416 AC_SUBST(libc_cv_fpie)
1418 AC_CACHE_CHECK(for --hash-style option,
1419 libc_cv_hashstyle, [dnl
1420 cat > conftest.c <<EOF
1421 int _start (void) { return 42; }
1422 EOF
1423 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1424 -fPIC -shared -o conftest.so conftest.c
1425 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1426 then
1427 libc_cv_hashstyle=yes
1428 else
1429 libc_cv_hashstyle=no
1430 fi
1431 rm -f conftest*])
1432 AC_SUBST(libc_cv_hashstyle)
1434 # The linker's default -shared behavior is good enough if it
1435 # does these things that our custom linker scripts ensure that
1436 # all allocated NOTE sections come first.
1437 if test "$use_default_link" = default; then
1438 AC_CACHE_CHECK([for sufficient default -shared layout],
1439 libc_cv_use_default_link, [dnl
1440 libc_cv_use_default_link=no
1441 cat > conftest.s <<\EOF
1442 .section .note.a,"a",%note
1443 .balign 4
1444 .long 4,4,9
1445 .string "GNU"
1446 .string "foo"
1447 .section .note.b,"a",%note
1448 .balign 4
1449 .long 4,4,9
1450 .string "GNU"
1451 .string "bar"
1452 EOF
1453 if AC_TRY_COMMAND([dnl
1454 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1455 ac_try=`$READELF -S conftest.so | sed -n \
1456 ['${x;p;}
1457 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1458 t a
1459 b
1460 : a
1461 H']`
1462 then
1463 libc_seen_a=no libc_seen_b=no
1464 set -- $ac_try
1465 while test $# -ge 2 -a "$1" = NOTE; do
1466 case "$2" in
1467 .note.a) libc_seen_a=yes ;;
1468 .note.b) libc_seen_b=yes ;;
1469 esac
1470 shift 2
1471 done
1472 case "$libc_seen_a$libc_seen_b" in
1473 yesyes)
1474 libc_cv_use_default_link=yes
1475 ;;
1476 *)
1477 echo >&AS_MESSAGE_LOG_FD "\
1478 $libc_seen_a$libc_seen_b from:
1479 $ac_try"
1480 ;;
1481 esac
1482 fi
1483 rm -f conftest*])
1484 use_default_link=$libc_cv_use_default_link
1485 fi
1487 AC_CACHE_CHECK(for GLOB_DAT reloc,
1488 libc_cv_has_glob_dat, [dnl
1489 cat > conftest.c <<EOF
1490 extern int mumble;
1491 int foo (void) { return mumble; }
1492 EOF
1493 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1494 -fPIC -shared -o conftest.so conftest.c
1495 -nostdlib -nostartfiles $no_ssp
1496 1>&AS_MESSAGE_LOG_FD])
1497 then
1498 dnl look for GLOB_DAT relocation.
1499 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1500 libc_cv_has_glob_dat=yes
1501 else
1502 libc_cv_has_glob_dat=no
1503 fi
1504 else
1505 libc_cv_has_glob_dat=no
1506 fi
1507 rm -f conftest*])
1508 AC_SUBST(libc_cv_has_glob_dat)
1510 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1511 if libc_cv_output_format=`
1512 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1513 then
1514 :
1515 else
1516 libc_cv_output_format=
1517 fi
1518 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1519 AC_SUBST(libc_cv_output_format)
1521 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1522 cat > conftest.c <<EOF
1523 int foo;
1524 EOF
1525 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1526 conftest.c 1>&AS_MESSAGE_LOG_FD])
1527 then
1528 libc_cv_fno_toplevel_reorder=yes
1529 else
1530 libc_cv_fno_toplevel_reorder=no
1531 fi
1532 rm -f conftest*])
1533 if test $libc_cv_fno_toplevel_reorder = yes; then
1534 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1535 else
1536 fno_unit_at_a_time=-fno-unit-at-a-time
1537 fi
1538 AC_SUBST(fno_unit_at_a_time)
1540 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1541 [dnl
1542 cat > conftest.c <<EOF
1543 __thread int i;
1544 void foo (void)
1545 {
1546 i = 10;
1547 }
1548 EOF
1549 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1550 conftest.c 1>&AS_MESSAGE_LOG_FD])
1551 then
1552 libc_cv_mtls_dialect_gnu2=yes
1553 else
1554 libc_cv_mtls_dialect_gnu2=no
1555 fi
1556 rm -f conftest*])
1557 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1558 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1560 AC_CACHE_CHECK(whether cc puts quotes around section names,
1561 libc_cv_have_section_quotes,
1562 [cat > conftest.c <<EOF
1563 static const int foo
1564 __attribute__ ((section ("bar"))) = 1;
1565 EOF
1566 if ${CC-cc} -S conftest.c -o conftest.s; then
1567 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1568 libc_cv_have_section_quotes=yes
1569 else
1570 libc_cv_have_section_quotes=no
1571 fi
1572 else
1573 libc_cv_have_section_quotes=unknown
1574 fi
1575 rm -f conftest.{c,s}
1576 ])
1577 if test $libc_cv_have_section_quotes = yes; then
1578 AC_DEFINE(HAVE_SECTION_QUOTES)
1579 fi
1581 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1582 cat > conftest.c <<\EOF
1583 void zero (void *x)
1584 {
1585 __builtin_memset (x, 0, 1000);
1586 }
1587 EOF
1588 dnl
1589 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1590 then
1591 libc_cv_gcc_builtin_memset=no
1592 else
1593 libc_cv_gcc_builtin_memset=yes
1594 fi
1595 rm -f conftest* ])
1596 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1597 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1598 fi
1600 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1601 cat > conftest.c <<\EOF
1602 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1603 char *foo (const char *a, const char *b)
1604 {
1605 return __builtin_strstr (a, b);
1606 }
1607 EOF
1608 dnl
1609 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1610 then
1611 libc_cv_gcc_builtin_redirection=yes
1612 else
1613 libc_cv_gcc_builtin_redirection=no
1614 fi
1615 rm -f conftest* ])
1616 if test "$libc_cv_gcc_builtin_redirection" = no; then
1617 AC_MSG_ERROR([support for the symbol redirection needed])
1618 fi
1620 dnl Determine how to disable generation of FMA instructions.
1621 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1622 libc_cv_cc_nofma, [dnl
1623 libc_cv_cc_nofma=
1624 for opt in -ffp-contract=off -mno-fused-madd; do
1625 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1626 done])
1627 AC_SUBST(libc_cv_cc_nofma)
1629 if test -n "$submachine"; then
1630 AC_CACHE_CHECK([for compiler option for CPU variant],
1631 libc_cv_cc_submachine, [dnl
1632 libc_cv_cc_submachine=no
1633 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1634 LIBC_TRY_CC_OPTION([$opt], [
1635 libc_cv_cc_submachine="$opt"
1636 break], [])
1637 done])
1638 if test "x$libc_cv_cc_submachine" = xno; then
1639 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1640 fi
1641 fi
1642 AC_SUBST(libc_cv_cc_submachine)
1644 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1645 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1646 cat > conftest.c <<EOF
1647 void
1648 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1649 foo (void) {}
1650 EOF
1651 libc_cv_cc_loop_to_function=no
1652 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1653 then
1654 libc_cv_cc_loop_to_function=yes
1655 fi
1656 rm -f conftest*])
1657 if test $libc_cv_cc_loop_to_function = yes; then
1658 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1659 fi
1660 AC_SUBST(libc_cv_cc_loop_to_function)
1662 dnl Check whether we have the gd library available.
1663 AC_MSG_CHECKING(for libgd)
1664 if test "$with_gd" != "no"; then
1665 old_CFLAGS="$CFLAGS"
1666 CFLAGS="$CFLAGS $libgd_include"
1667 old_LDFLAGS="$LDFLAGS"
1668 LDFLAGS="$LDFLAGS $libgd_ldflags"
1669 old_LIBS="$LIBS"
1670 LIBS="$LIBS -lgd -lpng -lz -lm"
1671 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1672 CFLAGS="$old_CFLAGS"
1673 LDFLAGS="$old_LDFLAGS"
1674 LIBS="$old_LIBS"
1675 else
1676 LIBGD=no
1677 fi
1678 AC_MSG_RESULT($LIBGD)
1679 AC_SUBST(LIBGD)
1681 # SELinux detection
1682 if test x$with_selinux = xno ; then
1683 have_selinux=no;
1684 else
1685 # See if we have the SELinux library
1686 AC_CHECK_LIB(selinux, is_selinux_enabled,
1687 have_selinux=yes, have_selinux=no)
1688 if test x$with_selinux = xyes ; then
1689 if test x$have_selinux = xno ; then
1690 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1691 fi
1692 fi
1693 fi
1694 # Check if we're building with SELinux support.
1695 if test "x$have_selinux" = xyes; then
1696 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1698 # See if we have the libaudit library
1699 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1700 have_libaudit=yes, have_libaudit=no)
1701 if test "x$have_libaudit" = xyes; then
1702 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1703 fi
1704 AC_SUBST(have_libaudit)
1706 # See if we have the libcap library
1707 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1708 if test "x$have_libcap" = xyes; then
1709 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1710 fi
1711 AC_SUBST(have_libcap)
1712 fi
1713 AC_SUBST(have_selinux)
1715 CPPUNDEFS=
1716 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1717 dnl Since we are building the implementations of the fortified functions here,
1718 dnl having the macro defined interacts very badly.
1719 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1720 [AC_TRY_COMPILE([], [
1721 #ifdef _FORTIFY_SOURCE
1722 # error bogon
1723 #endif],
1724 [libc_cv_predef_fortify_source=no],
1725 [libc_cv_predef_fortify_source=yes])])
1726 if test $libc_cv_predef_fortify_source = yes; then
1727 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1728 fi
1729 AC_SUBST(CPPUNDEFS)
1731 # Some linkers on some architectures support __ehdr_start but with
1732 # bugs. Make sure usage of it does not create relocations in the
1733 # output (as the linker should resolve them all for us).
1734 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1735 libc_cv_ehdr_start, [
1736 old_CFLAGS="$CFLAGS"
1737 old_LDFLAGS="$LDFLAGS"
1738 old_LIBS="$LIBS"
1739 CFLAGS="$CFLAGS -fPIC"
1740 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1741 LIBS=
1742 AC_LINK_IFELSE([AC_LANG_SOURCE([
1743 typedef struct {
1744 char foo;
1745 long val;
1746 } Ehdr;
1747 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1748 long ehdr (void) { return __ehdr_start.val; }
1749 ])],
1750 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1751 libc_cv_ehdr_start=broken
1752 else
1753 libc_cv_ehdr_start=yes
1754 fi], [libc_cv_ehdr_start=no])
1755 CFLAGS="$old_CFLAGS"
1756 LDFLAGS="$old_LDFLAGS"
1757 LIBS="$old_LIBS"
1758 ])
1759 if test "$libc_cv_ehdr_start" = yes; then
1760 AC_DEFINE([HAVE_EHDR_START])
1761 elif test "$libc_cv_ehdr_start" = broken; then
1762 AC_MSG_WARN([linker is broken -- you should upgrade])
1763 fi
1765 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1766 libc_cv_builtin_trap, [dnl
1767 libc_cv_builtin_trap=no
1768 AC_TRY_COMPILE([], [__builtin_trap ()], [
1769 libc_undefs=`$NM -u conftest.o |
1770 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1771 2>&AS_MESSAGE_LOG_FD` || {
1772 AC_MSG_ERROR([confusing output from $NM -u])
1773 }
1774 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1775 if test -z "$libc_undefs"; then
1776 libc_cv_builtin_trap=yes
1777 fi])])
1778 if test $libc_cv_builtin_trap = yes; then
1779 AC_DEFINE([HAVE_BUILTIN_TRAP])
1780 fi
1782 dnl C++ feature tests.
1783 AC_LANG_PUSH([C++])
1785 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1786 libc_cv_cxx_thread_local, [
1787 old_CXXFLAGS="$CXXFLAGS"
1788 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1789 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1790 #include <thread>
1792 // Compiler support.
1793 struct S
1794 {
1795 S ();
1796 ~S ();
1797 };
1798 thread_local S s;
1799 S * get () { return &s; }
1801 // libstdc++ support.
1802 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1803 #error __cxa_thread_atexit_impl not supported
1804 #endif
1805 ])],
1806 [libc_cv_cxx_thread_local=yes],
1807 [libc_cv_cxx_thread_local=no])
1808 CXXFLAGS="$old_CXXFLAGS"
1809 ])
1810 AC_SUBST(libc_cv_cxx_thread_local)
1812 AC_LANG_POP([C++])
1813 dnl End of C++ feature tests.
1815 ### End of automated tests.
1816 ### Now run sysdeps configure fragments.
1818 # They also can set these variables.
1819 use_ldconfig=no
1820 ldd_rewrite_script=no
1821 libc_cv_sysconfdir=$sysconfdir
1822 libc_cv_localstatedir=$localstatedir
1823 libc_cv_gcc_unwind_find_fde=no
1824 libc_cv_idn=no
1826 # Iterate over all the sysdep directories we will use, running their
1827 # configure fragments.
1828 for dir in $sysnames; do
1829 case $dir in
1830 /*) dest=$dir ;;
1831 *) dest=$srcdir/$dir ;;
1832 esac
1833 if test -r $dest/configure; then
1834 AC_MSG_RESULT(running configure fragment for $dir)
1835 . $dest/configure
1836 fi
1837 done
1839 if test x"$build_mathvec" = xnotset; then
1840 build_mathvec=no
1841 fi
1842 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1844 AC_SUBST(libc_extra_cflags)
1845 AC_SUBST(libc_extra_cppflags)
1847 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1848 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1849 fi
1850 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1852 # A sysdeps configure fragment can reset this if IFUNC is not actually
1853 # usable even though the assembler knows how to generate the symbol type.
1854 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1855 AC_DEFINE(HAVE_IFUNC)
1856 fi
1858 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1859 AC_DEFINE(HAVE_GCC_IFUNC)
1860 fi
1862 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1863 # configure fragment can override the value to prevent this AC_DEFINE.
1864 AC_SUBST(use_nscd)
1865 if test "x$use_nscd" != xno; then
1866 AC_DEFINE([USE_NSCD])
1867 fi
1868 if test "x$build_nscd" = xdefault; then
1869 build_nscd=$use_nscd
1870 fi
1872 AC_SUBST(libc_cv_slibdir)
1873 AC_SUBST(libc_cv_rtlddir)
1874 AC_SUBST(libc_cv_complocaledir)
1875 AC_SUBST(libc_cv_sysconfdir)
1876 AC_SUBST(libc_cv_localstatedir)
1877 AC_SUBST(libc_cv_rootsbindir)
1879 if test x$use_ldconfig = xyes; then
1880 AC_DEFINE(USE_LDCONFIG)
1881 fi
1882 AC_SUBST(use_ldconfig)
1883 AC_SUBST(ldd_rewrite_script)
1885 AC_SUBST(static)
1886 AC_SUBST(shared)
1888 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1889 [libc_cv_pic_default=yes
1890 cat > conftest.c <<EOF
1891 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1892 # error PIC is default.
1893 #endif
1894 EOF
1895 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1896 libc_cv_pic_default=no
1897 fi
1898 rm -f conftest.*])
1899 AC_SUBST(libc_cv_pic_default)
1901 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1902 [libc_cv_pie_default=yes
1903 cat > conftest.c <<EOF
1904 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1905 # error PIE is default.
1906 #endif
1907 EOF
1908 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1909 libc_cv_pie_default=no
1910 fi
1911 rm -f conftest.*])
1912 AC_SUBST(libc_cv_pie_default)
1914 AC_SUBST(profile)
1915 AC_SUBST(static_nss)
1917 AC_SUBST(DEFINES)
1919 dnl See sysdeps/mach/configure.ac for this variable.
1920 AC_SUBST(mach_interface_list)
1922 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1923 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1924 AC_SUBST(VERSION)
1925 AC_SUBST(RELEASE)
1927 AC_CONFIG_FILES([config.make Makefile])
1928 AC_CONFIG_COMMANDS([default],[[
1929 case $CONFIG_FILES in *config.make*)
1930 echo "$config_vars" >> config.make;;
1931 esac
1932 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1933 AC_OUTPUT