| blob | 2782bfaf08cf8b796e9092f83e31eb62ba203ad3 |
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 # The abi-tags file uses a fairly simplistic model for name recognition that
425 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
426 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
427 # This doesn't get used much beyond that, so it's fairly safe.
428 case "$host_os" in
429 linux*)
430 ;;
431 gnu*)
432 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
433 ;;
434 esac
436 AC_ARG_ENABLE([mathvec],
437 [AS_HELP_STRING([--enable-mathvec],
438 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
439 [build_mathvec=$enableval],
440 [build_mathvec=notset])
442 # We keep the original values in `$config_*' and never modify them, so we
443 # can write them unchanged into config.make. Everything else uses
444 # $machine, $vendor, and $os, and changes them whenever convenient.
445 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
447 # Don't allow vendor == "unknown"
448 test "$config_vendor" = unknown && config_vendor=
449 config_os="`echo $config_os | sed 's/^unknown-//'`"
451 # Some configurations imply other options.
452 elf=yes
454 # The configure fragment of an add-on port can modify these to supplement
455 # or override the table in the case statement below. No fragment should
456 # ever change the config_* variables, however.
457 machine=$config_machine
458 vendor=$config_vendor
459 os=$config_os
460 base_os=''
462 submachine=
463 AC_ARG_WITH([cpu],
464 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
465 [dnl
466 case "$withval" in
467 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
468 no) ;;
469 *) submachine="$withval" ;;
470 esac
471 ])
473 # An preconfigure script can set this when it wants to disable the sanity
474 # check below.
475 libc_config_ok=no
477 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
478 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
480 dnl Having this here, though empty, makes sure that if add-ons' fragments
481 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
482 dnl our AC_OUTPUT will actually use it.
483 AC_CONFIG_SUBDIRS()
485 case "$enable_add_ons" in
486 ''|no) add_ons= ;;
487 yes|'*')
488 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
489 sed 's@/[[^/]]*$@@' | sort | uniq`
490 add_ons_automatic=yes
491 ;;
492 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
493 add_ons_automatic=no ;;
494 esac
496 configured_add_ons=
497 add_ons_sfx=
498 add_ons_pfx=
499 if test x"$add_ons" != x; then
500 for f in $add_ons; do
501 # Some sanity checks
502 case "$f" in
503 crypt)
504 AC_MSG_ERROR([
505 *** It seems that you're using an old \`crypt' add-on. crypt is now
506 *** part of glibc and using the old add-on will not work with this
507 *** release. Start again with fresh sources and without the old
508 *** \`crypt' add-on.])
509 ;;
510 localedata)
511 AC_MSG_ERROR([
512 *** It seems that you're using an old \`localedata' add-on. localedata
513 *** is now part of glibc and using the old add-on will not work with
514 *** this release. Start again with fresh sources and without the old
515 *** \`localedata' add-on.])
516 ;;
517 esac
518 done
520 # Now source each add-on's configure fragment.
521 # The fragments can use $srcdir/$libc_add_on to find themselves,
522 # and test $add_ons_automatic to see if they were explicitly requested.
523 # A fragment can clear (or even change) $libc_add_on to affect
524 # whether it goes into the list to be actually used in the build.
525 use_add_ons=
526 for libc_add_on in $add_ons; do
527 # Test whether such a directory really exists.
528 # It can be absolute, or relative to $srcdir, or relative to the build dir.
529 case "$libc_add_on" in
530 /*)
531 libc_add_on_srcdir=$libc_add_on
532 ;;
533 *)
534 test -d "$srcdir/$libc_add_on" || {
535 if test -d "$libc_add_on"; then
536 libc_add_on="`pwd`/$libc_add_on"
537 else
538 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
539 fi
540 }
541 libc_add_on_srcdir=$srcdir/$libc_add_on
542 ;;
543 esac
545 libc_add_on_frag=$libc_add_on_srcdir/configure
546 libc_add_on_canonical=
547 libc_add_on_config_subdirs=
548 if test -r "$libc_add_on_frag"; then
549 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
550 libc_add_on_canonical=unknown
551 libc_add_on_subdirs=
552 . "$libc_add_on_frag"
553 test -z "$libc_add_on" || {
554 configured_add_ons="$configured_add_ons $libc_add_on"
555 if test "x$libc_add_on_canonical" = xunknown; then
556 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
557 fi
558 for d in $libc_add_on_subdirs; do
559 case "$libc_add_on" in
560 /*) subdir_srcdir="$libc_add_on" ;;
561 *) subdir_srcdir="\$(..)$libc_add_on" ;;
562 esac
563 case "$d" in
564 .)
565 d="${libc_add_on_canonical:-$libc_add_on}"
566 ;;
567 /*)
568 subdir_srcdir="$d"
569 ;;
570 *)
571 subdir_srcdir="$subdir_srcdir/$d"
572 ;;
573 esac
574 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
575 add_on_subdirs="$add_on_subdirs $d"
576 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
577 $d-srcdir = $subdir_srcdir"
578 done
579 for d in $libc_add_on_config_subdirs; do
580 case "$d" in
581 /*) AC_MSG_ERROR(dnl
582 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
583 esac
584 if test ! -d "$libc_add_on_srcdir/$d"; then
585 AC_MSG_ERROR(fragment wants to configure missing directory $d)
586 fi
587 case "$libc_add_on" in
588 /*) AC_MSG_ERROR(dnl
589 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
590 esac
591 subdirs="$subdirs $libc_add_on/$d"
592 done
593 }
594 fi
595 if test -n "$libc_add_on"; then
596 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
597 use_add_ons="$use_add_ons $libc_add_on"
598 add_ons_pfx="$add_ons_pfx $libc_add_on/"
599 test -z "$libc_add_on_canonical" ||
600 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
601 fi
602 done
603 # Use echo to strip excess whitespace.
604 add_ons="`echo $use_add_ons`"
605 fi
606 AC_SUBST(add_ons)
607 AC_SUBST(add_on_subdirs)
610 ###
611 ### By using the undocumented --enable-hacker-mode option for configure
612 ### one can skip this test to make the configuration not fail for unsupported
613 ### platforms.
614 ###
615 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
616 case "$machine-$host_os" in
617 *-linux* | *-gnu*)
618 ;;
619 *)
620 AC_MSG_ERROR([
621 *** The GNU C library is currently unavailable for this platform.
622 *** If you are interested in seeing glibc on this platform visit
623 *** the "How to submit a new port" in the wiki:
624 *** https://sourceware.org/glibc/wiki/#Development
625 *** and join the community!])
626 ;;
627 esac
628 fi
630 # Set base_machine if not set by a preconfigure fragment.
631 test -n "$base_machine" || base_machine=$machine
632 AC_SUBST(base_machine)
634 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
635 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
636 [libc_cv_ssp=yes],
637 [libc_cv_ssp=no])
638 ])
640 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
641 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
642 [libc_cv_ssp_strong=yes],
643 [libc_cv_ssp_strong=no])
644 ])
646 AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
647 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
648 [libc_cv_ssp_all=yes],
649 [libc_cv_ssp_all=no])
650 ])
652 stack_protector=
653 no_stack_protector=
654 if test "$libc_cv_ssp" = yes; then
655 no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
656 AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
657 fi
659 if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
660 stack_protector="-fstack-protector"
661 AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
662 elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
663 stack_protector="-fstack-protector-all"
664 AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
665 elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
666 stack_protector="-fstack-protector-strong"
667 AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
668 else
669 stack_protector="-fno-stack-protector"
670 AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
671 fi
672 AC_SUBST(libc_cv_ssp)
673 AC_SUBST(stack_protector)
674 AC_SUBST(no_stack_protector)
676 if test -n "$stack_protector"; then
677 dnl Don't run configure tests with stack-protection on, to avoid problems with
678 dnl bootstrapping.
679 no_ssp=-fno-stack-protector
680 else
681 no_ssp=
683 if test "$enable_stack_protector" != no; then
684 AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
685 fi
686 fi
688 # For the multi-arch option we need support in the assembler & linker.
689 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
690 libc_cv_ld_gnu_indirect_function, [dnl
691 cat > conftest.S <<EOF
692 .type foo,%gnu_indirect_function
693 foo:
694 .globl _start
695 _start:
696 .globl __start
697 __start:
698 .data
699 #ifdef _LP64
700 .quad foo
701 #else
702 .long foo
703 #endif
704 EOF
705 libc_cv_ld_gnu_indirect_function=no
706 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
707 -nostartfiles -nostdlib $no_ssp \
708 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
709 # Do a link to see if the backend supports IFUNC relocs.
710 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
711 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
712 libc_cv_ld_gnu_indirect_function=yes
713 }
714 fi
715 rm -f conftest*])
717 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
718 AC_CACHE_CHECK([for gcc attribute ifunc support],
719 libc_cv_gcc_indirect_function, [dnl
720 cat > conftest.c <<EOF
721 extern int func (int);
722 int used_func (int a)
723 {
724 return a;
725 }
726 static void *resolver ()
727 {
728 return &used_func;
729 }
730 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
731 EOF
732 libc_cv_gcc_indirect_function=no
733 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
734 2>&AS_MESSAGE_LOG_FD ; then
735 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
736 libc_cv_gcc_indirect_function=yes
737 fi
738 fi
739 rm -f conftest*])
741 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
742 if test x"$multi_arch" = xyes; then
743 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
744 else
745 multi_arch=no
746 fi
747 fi
748 if test x"$libc_cv_gcc_indirect_function" != xyes &&
749 test x"$multi_arch" = xyes; then
750 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
751 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
752 fi
753 multi_arch_d=
754 if test x"$multi_arch" != xno; then
755 multi_arch_d=/multiarch
756 fi
758 # Compute the list of sysdep directories for this configuration.
759 # This can take a while to compute.
760 sysdep_dir=$srcdir/sysdeps
761 AC_MSG_CHECKING(sysdep dirs)
762 dnl We need to use [ and ] for other purposes for a while now.
763 changequote(,)dnl
764 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
765 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
767 test "x$base_os" != x || case "$os" in
768 gnu*)
769 base_os=mach/hurd ;;
770 linux*)
771 base_os=unix/sysv ;;
772 esac
774 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
775 tail=$os
776 ostry=$os
777 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
778 ostry="$ostry /$o"
779 tail=$o
780 done
781 o=`echo $tail | sed 's/[0-9]*$//'`
782 if test $o != $tail; then
783 ostry="$ostry /$o"
784 fi
785 # For linux-gnu, try linux-gnu, then linux.
786 o=`echo $tail | sed 's/-.*$//'`
787 if test $o != $tail; then
788 ostry="$ostry /$o"
789 fi
791 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
792 base=
793 tail=$base_os
794 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
795 set $b
796 base="$base /$1"
797 tail="$2"
798 done
800 # For sparc/sparc32, try sparc/sparc32 and then sparc.
801 mach=
802 tail=$machine${submachine:+/$submachine}
803 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
804 set $m
805 # Prepend the machine's FPU directory unless --without-fp.
806 if test "$with_fp" = yes; then
807 maybe_fpu=/fpu
808 else
809 maybe_fpu=/nofpu
810 fi
811 # For each machine term, try it with and then without /multiarch.
812 for try_fpu in $maybe_fpu ''; do
813 for try_multi in $multi_arch_d ''; do
814 mach="$mach /$1$try_fpu$try_multi"
815 done
816 done
817 tail="$2"
818 done
820 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
821 changequote([,])dnl
823 # Find what sysdep directories exist.
824 sysnames_add_ons=
825 sysnames=
826 for b in $base ''; do
827 for m0 in $mach ''; do
828 for v in /$vendor ''; do
829 test "$v" = / && continue
830 for o in /$ostry ''; do
831 test "$o" = / && continue
832 for m in $mach ''; do
833 for d in $add_ons_pfx ''; do
834 for a in $add_ons_sfx ''; do
835 try_suffix="$m0$b$v$o$m"
836 if test -n "$try_suffix"; then
837 try_srcdir="${srcdir}/"
838 case "$d" in
839 /*) try_srcdir= ;;
840 esac
841 try="${d}sysdeps$try_suffix$a"
842 test -n "$enable_debug_configure" &&
843 echo "$0 [DEBUG]: try $try" >&2
844 if test -d "$try_srcdir$try"; then
845 sysnames="$sysnames $try"
846 { test -n "$o" || test -n "$b"; } && os_used=t
847 { test -n "$m" || test -n "$m0"; } && machine_used=t
848 case x${m0:-$m} in
849 x*/$submachine) submachine_used=t ;;
850 esac
851 if test -n "$d"; then
852 case "$sysnames_add_ons" in
853 *" $d "*) ;;
854 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
855 esac
856 fi
857 fi
858 fi
859 done
860 done
861 done
862 done
863 done
864 done
865 done
867 # If the assembler supports gnu_indirect_function symbol type and the
868 # architecture supports multi-arch, we enable multi-arch by default.
869 case $sysnames_add_ons$sysnames in
870 *"$multi_arch_d"*)
871 ;;
872 *)
873 test x"$multi_arch" = xdefault && multi_arch=no
874 ;;
875 esac
876 if test x"$multi_arch" != xno; then
877 AC_DEFINE(USE_MULTIARCH)
878 fi
879 AC_SUBST(multi_arch)
881 if test -z "$os_used" && test "$os" != none; then
882 AC_MSG_ERROR(Operating system $os is not supported.)
883 fi
884 if test -z "$machine_used" && test "$machine" != none; then
885 AC_MSG_ERROR(The $machine is not supported.)
886 fi
887 if test -z "$submachine_used" && test -n "$submachine"; then
888 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
889 fi
890 AC_SUBST(submachine)
892 # We have now validated the configuration.
894 # Expand the list of system names into a full list of directories
895 # from each element's parent name and Implies file (if present).
896 set $sysnames
897 names=
898 while test $# -gt 0; do
899 name=$1
900 shift
902 case " $names " in *" $name "*)
903 # Already in the list.
904 continue
905 esac
907 # Report each name as we discover it, so there is no long pause in output.
908 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
910 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
912 case $name in
913 /*) xsrcdir= ;;
914 *) xsrcdir=$srcdir/ ;;
915 esac
916 test -n "$enable_debug_configure" &&
917 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
919 for implies_file in Implies Implies-before Implies-after; do
920 implies_type=`echo $implies_file | sed s/-/_/`
921 eval ${implies_type}=
922 if test -f $xsrcdir$name/$implies_file; then
923 # Collect more names from the `Implies' file (removing comments).
924 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
925 for x in $implied_candidate; do
926 found=no
927 if test -d $xsrcdir$name_base/$x; then
928 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
929 found=yes
930 fi
931 for d in $add_ons_pfx ''; do
932 try="${d}sysdeps/$x"
933 case $d in
934 /*) try_srcdir= ;;
935 *) try_srcdir=$srcdir/ ;;
936 esac
937 test -n "$enable_debug_configure" &&
938 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
939 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
940 then
941 eval "${implies_type}=\"\$${implies_type} \$try\""
942 found=yes
943 case "$sysnames_add_ons" in
944 *" $d "*) ;;
945 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
946 esac
947 fi
948 done
949 if test $found = no; then
950 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
951 fi
952 done
953 fi
954 done
956 # Add NAME to the list of names.
957 names="$names $name"
959 # Find the parent of NAME, using the empty string if it has none.
960 changequote(,)dnl
961 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
962 changequote([,])dnl
964 test -n "$enable_debug_configure" &&
965 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
966 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
968 # Add the names implied by NAME, and NAME's parent (if it has one), to
969 # the list of names to be processed (the argument list). We prepend the
970 # implied names to the list and append the parent. We want implied
971 # directories to come before further directories inferred from the
972 # configuration components; this ensures that for sysv4, unix/common
973 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
974 # after sysv4).
975 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
976 test -n "$sysnames" && set $sysnames
977 done
979 # Add the default directories.
980 default_sysnames="sysdeps/generic"
981 sysnames="$names $default_sysnames"
982 AC_SUBST(sysnames)
983 # The other names were emitted during the scan.
984 AC_MSG_RESULT($default_sysnames)
986 # Collect the list of add-ons that supply partial sysdeps trees.
987 sysdeps_add_ons=
988 for add_on in $add_ons; do
989 case "$add_on" in
990 /*) xsrcdir= ;;
991 *) xsrcdir="$srcdir/" ;;
992 esac
994 test -d "$xsrcdir$add_on/sysdeps" || {
995 case "$configured_add_ons " in
996 *" $add_on "*) ;;
997 *|'')
998 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
999 ;;
1000 esac
1001 continue
1002 }
1004 sysdeps_add_ons="$sysdeps_add_ons $add_on"
1005 case "$sysnames_add_ons" in
1006 *" $add_on/ "*) ;;
1007 *|'')
1008 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
1009 continue ;;
1010 esac
1012 found=no
1013 for d in $sysnames; do
1014 case "$d" in
1015 $add_on/sysdeps/*) ;;
1016 *) continue ;;
1017 esac
1018 (cd "$xsrcdir$d" && for f in *[[!~]]; do
1019 case "$f" in
1020 sys|bits)
1021 for ff in $f/*.h; do
1022 test -d "$ff" || { test -e "$ff" && exit 88; }
1023 done
1024 ;;
1025 *)
1026 test -d "$f" || { test -e "$f" && exit 88; }
1027 ;;
1028 esac
1029 done)
1030 if test $? -eq 88; then
1031 found=yes
1032 break
1033 fi
1034 done
1035 if test $found = no; then
1036 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
1037 fi
1038 done
1039 AC_SUBST(sysdeps_add_ons)
1042 ### Locate tools.
1044 AC_PROG_INSTALL
1045 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
1046 # The makefiles need to use a different form to find it in $srcdir.
1047 INSTALL='\$(..)./scripts/install-sh -c'
1048 fi
1049 AC_PROG_LN_S
1051 LIBC_PROG_BINUTILS
1053 # Accept binutils 2.22 or newer.
1054 AC_CHECK_PROG_VER(AS, $AS, --version,
1055 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
1056 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1057 AS=: critic_missing="$critic_missing as")
1058 AC_CHECK_PROG_VER(LD, $LD, --version,
1059 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
1060 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
1061 LD=: critic_missing="$critic_missing ld")
1063 # These programs are version sensitive.
1064 AC_CHECK_TOOL_PREFIX
1065 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1066 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1067 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1069 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1070 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1071 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1072 MSGFMT=: aux_missing="$aux_missing msgfmt")
1073 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1074 [GNU texinfo.* \([0-9][0-9.]*\)],
1075 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1076 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1077 AC_CHECK_PROG_VER(SED, sed, --version,
1078 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1079 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1080 SED=: aux_missing="$aux_missing sed")
1081 AC_CHECK_PROG_VER(AWK, gawk, --version,
1082 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1083 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1085 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1086 AC_TRY_COMPILE([], [
1087 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
1088 #error insufficient compiler
1089 #endif],
1090 [libc_cv_compiler_ok=yes],
1091 [libc_cv_compiler_ok=no])])
1092 AS_IF([test $libc_cv_compiler_ok != yes],
1093 [critic_missing="$critic_missing compiler"])
1095 AC_CHECK_TOOL(NM, nm, false)
1097 if test "x$maintainer" = "xyes"; then
1098 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1099 case "x$AUTOCONF" in
1100 xno|x|x:) AUTOCONF=no ;;
1101 *)
1102 AC_CACHE_CHECK(dnl
1103 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1104 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1105 libc_cv_autoconf_works=yes
1106 else
1107 libc_cv_autoconf_works=no
1108 fi])
1109 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1110 ;;
1111 esac
1112 if test "x$AUTOCONF" = xno; then
1113 aux_missing="$aux_missing autoconf"
1114 fi
1115 else
1116 AUTOCONF=no
1117 fi
1119 # Check for python3 if available, or else python.
1120 AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
1121 case "x$PYTHON_PROG" in
1122 xno|x|x:) PYTHON_PROG=no ;;
1123 *) ;;
1124 esac
1126 if test "x$PYTHON_PROG" = xno; then
1127 aux_missing="$aux_missing python"
1128 else
1129 PYTHON="$PYTHON_PROG -B"
1130 AC_SUBST(PYTHON)
1131 fi
1133 test -n "$critic_missing" && AC_MSG_ERROR([
1134 *** These critical programs are missing or too old:$critic_missing
1135 *** Check the INSTALL file for required versions.])
1137 test -n "$aux_missing" && AC_MSG_WARN([
1138 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1139 *** some features or tests will be disabled.
1140 *** Check the INSTALL file for required versions.])
1142 # if using special system headers, find out the compiler's sekrit
1143 # header directory and add that to the list. NOTE: Only does the right
1144 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1145 if test -n "$sysheaders"; then
1146 SYSINCLUDES=-nostdinc
1147 for d in include include-fixed; do
1148 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1149 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1150 done
1151 SYSINCLUDES="$SYSINCLUDES \
1152 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1153 if test -n "$CXX"; then
1154 CXX_SYSINCLUDES=
1155 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1156 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1157 test "x$cxxheaders" != x &&
1158 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1159 done
1160 fi
1161 fi
1162 AC_SUBST(SYSINCLUDES)
1163 AC_SUBST(CXX_SYSINCLUDES)
1165 # Obtain some C++ header file paths. This is used to make a local
1166 # copy of those headers in Makerules.
1167 if test -n "$CXX"; then
1168 find_cxx_header () {
1169 echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}"
1170 }
1171 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1172 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1173 fi
1174 AC_SUBST(CXX_CSTDLIB_HEADER)
1175 AC_SUBST(CXX_CMATH_HEADER)
1177 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1178 # since this would lead to problems installing/building glibc.
1179 # LD_LIBRARY_PATH contains the current directory if one of the following
1180 # is true:
1181 # - one of the terminals (":" and ";") is the first or last sign
1182 # - two terminals occur directly after each other
1183 # - the path contains an element with a dot in it
1184 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1185 changequote(,)dnl
1186 case ${LD_LIBRARY_PATH} in
1187 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1188 ld_library_path_setting="contains current directory"
1189 ;;
1190 *)
1191 ld_library_path_setting="ok"
1192 ;;
1193 esac
1194 changequote([,])dnl
1195 AC_MSG_RESULT($ld_library_path_setting)
1196 if test "$ld_library_path_setting" != "ok"; then
1197 AC_MSG_ERROR([
1198 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1199 *** building glibc. Please change the environment variable
1200 *** and run configure again.])
1201 fi
1203 AC_PATH_PROG(BASH_SHELL, bash, no)
1205 AC_PATH_PROG(PERL, perl, no)
1206 if test "$PERL" != no &&
1207 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1208 PERL=no
1209 fi
1210 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1211 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1212 AC_CHECK_PROG_VER(BISON, bison, --version,
1213 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1214 [2.7*|[3-9].*|[1-9][0-9]*],
1215 BISON=no)
1217 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1218 cat > conftest.s <<EOF
1219 .text
1220 foo:
1221 .set glibc_conftest_frobozz,foo
1222 .globl glibc_conftest_frobozz
1223 EOF
1224 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1225 # (but it doesn't work), so we must do a linking check to be sure.
1226 cat > conftest1.c <<\EOF
1227 extern int glibc_conftest_frobozz;
1228 void _start() { glibc_conftest_frobozz = 1; }
1229 EOF
1230 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1231 -nostartfiles -nostdlib $no_ssp \
1232 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1233 libc_cv_asm_set_directive=yes
1234 else
1235 libc_cv_asm_set_directive=no
1236 fi
1237 rm -f conftest*])
1238 if test $libc_cv_asm_set_directive = yes; then
1239 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1240 fi
1242 AC_CACHE_CHECK(linker support for protected data symbol,
1243 libc_cv_protected_data,
1244 [cat > conftest.c <<EOF
1245 int bar __attribute__ ((visibility ("protected"))) = 1;
1246 EOF
1247 libc_cv_protected_data=no
1248 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
1249 cat > conftest.c <<EOF
1250 extern int bar;
1251 int main (void) { return bar; }
1252 EOF
1253 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
1254 libc_cv_protected_data=yes
1255 fi
1256 fi
1257 rm -f conftest.*
1258 ])
1259 AC_SUBST(libc_cv_protected_data)
1261 AC_CACHE_CHECK(for broken __attribute__((alias())),
1262 libc_cv_broken_alias_attribute,
1263 [cat > conftest.c <<EOF
1264 extern int foo (int x) __asm ("xyzzy");
1265 int bar (int x) { return x; }
1266 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1267 extern int dfoo;
1268 extern __typeof (dfoo) dfoo __asm ("abccb");
1269 int dfoo = 1;
1270 EOF
1271 libc_cv_broken_alias_attribute=yes
1272 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1273 if grep 'xyzzy' conftest.s >/dev/null &&
1274 grep 'abccb' conftest.s >/dev/null; then
1275 libc_cv_broken_alias_attribute=no
1276 fi
1277 fi
1278 rm -f conftest.c conftest.s
1279 ])
1280 if test $libc_cv_broken_alias_attribute = yes; then
1281 AC_MSG_ERROR(working alias attribute support required)
1282 fi
1284 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1285 libc_cv_have_sdata_section,
1286 [echo "int i;" > conftest.c
1287 libc_cv_have_sdata_section=no
1288 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1289 | grep '\.sdata' >/dev/null; then
1290 libc_cv_have_sdata_section=yes
1291 fi
1292 rm -f conftest.c conftest.so
1293 ])
1294 if test $libc_cv_have_sdata_section = yes; then
1295 AC_DEFINE(HAVE_SDATA_SECTION)
1296 fi
1298 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1299 libc_cv_ctors_header, [dnl
1300 libc_cv_ctors_header=yes
1301 LIBC_TRY_LINK_STATIC([
1302 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1303 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1304 ],
1305 [dnl
1306 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1307 { gsub(/\@<:@ */, "@<:@") }
1308 $2 == ".ctors" || $2 == ".dtors" {
1309 size = strtonum("0x" $6)
1310 align = strtonum("0x" $NF)
1311 seen@<:@$2@:>@ = 1
1312 stub@<:@$2@:>@ = size == align * 2
1313 }
1314 END {
1315 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1316 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1317 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1318 }
1319 '], [libc_cv_ctors_header=no])
1320 ], [dnl
1321 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1322 ])
1323 ])
1324 if test $libc_cv_ctors_header = no; then
1325 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1326 fi
1328 AC_CACHE_CHECK(for libunwind-support in compiler,
1329 libc_cv_cc_with_libunwind, [
1330 cat > conftest.c <<EOF
1331 int main (void) { return 0; }
1332 EOF
1333 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1334 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1335 libc_cv_cc_with_libunwind=yes
1336 else
1337 libc_cv_cc_with_libunwind=no
1338 fi
1339 rm -f conftest*])
1340 AC_SUBST(libc_cv_cc_with_libunwind)
1341 if test $libc_cv_cc_with_libunwind = yes; then
1342 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1343 fi
1345 ASFLAGS_config=
1346 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1347 libc_cv_as_noexecstack, [dnl
1348 cat > conftest.c <<EOF
1349 void foo (void) { }
1350 EOF
1351 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1352 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1353 && grep .note.GNU-stack conftest.s >/dev/null \
1354 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1355 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1356 then
1357 libc_cv_as_noexecstack=yes
1358 else
1359 libc_cv_as_noexecstack=no
1360 fi
1361 rm -f conftest*])
1362 if test $libc_cv_as_noexecstack = yes; then
1363 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1364 fi
1365 AC_SUBST(ASFLAGS_config)
1367 AC_CACHE_CHECK(for -z combreloc,
1368 libc_cv_z_combreloc, [dnl
1369 cat > conftest.c <<EOF
1370 extern int bar (int);
1371 extern int mumble;
1372 int foo (void) { return bar (mumble); }
1373 EOF
1374 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1375 -fPIC -shared $no_ssp -o conftest.so conftest.c
1376 -nostdlib -nostartfiles
1377 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1378 then
1379 dnl The following test is a bit weak. We must use a tool which can test
1380 dnl cross-platform since the gcc used can be a cross compiler. Without
1381 dnl introducing new options this is not easily doable. Instead use a tool
1382 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1383 dnl look for a section named .rel.dyn.
1384 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1385 libc_cv_z_combreloc=yes
1386 else
1387 libc_cv_z_combreloc=no
1388 fi
1389 else
1390 libc_cv_z_combreloc=no
1391 fi
1392 rm -f conftest*])
1393 if test "$libc_cv_z_combreloc" = yes; then
1394 AC_DEFINE(HAVE_Z_COMBRELOC)
1395 fi
1396 AC_SUBST(libc_cv_z_combreloc)
1398 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1399 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1400 AC_SUBST(libc_cv_z_execstack)
1402 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1403 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1404 ])
1406 AC_SUBST(libc_cv_fpie)
1408 AC_CACHE_CHECK(for --hash-style option,
1409 libc_cv_hashstyle, [dnl
1410 cat > conftest.c <<EOF
1411 int _start (void) { return 42; }
1412 EOF
1413 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
1414 -fPIC -shared -o conftest.so conftest.c
1415 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1416 then
1417 libc_cv_hashstyle=yes
1418 else
1419 libc_cv_hashstyle=no
1420 fi
1421 rm -f conftest*])
1422 AC_SUBST(libc_cv_hashstyle)
1424 # The linker's default -shared behavior is good enough if it
1425 # does these things that our custom linker scripts ensure that
1426 # all allocated NOTE sections come first.
1427 if test "$use_default_link" = default; then
1428 AC_CACHE_CHECK([for sufficient default -shared layout],
1429 libc_cv_use_default_link, [dnl
1430 libc_cv_use_default_link=no
1431 cat > conftest.s <<\EOF
1432 .section .note.a,"a",%note
1433 .balign 4
1434 .long 4,4,9
1435 .string "GNU"
1436 .string "foo"
1437 .section .note.b,"a",%note
1438 .balign 4
1439 .long 4,4,9
1440 .string "GNU"
1441 .string "bar"
1442 EOF
1443 if AC_TRY_COMMAND([dnl
1444 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1445 ac_try=`$READELF -S conftest.so | sed -n \
1446 ['${x;p;}
1447 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1448 t a
1449 b
1450 : a
1451 H']`
1452 then
1453 libc_seen_a=no libc_seen_b=no
1454 set -- $ac_try
1455 while test $# -ge 2 -a "$1" = NOTE; do
1456 case "$2" in
1457 .note.a) libc_seen_a=yes ;;
1458 .note.b) libc_seen_b=yes ;;
1459 esac
1460 shift 2
1461 done
1462 case "$libc_seen_a$libc_seen_b" in
1463 yesyes)
1464 libc_cv_use_default_link=yes
1465 ;;
1466 *)
1467 echo >&AS_MESSAGE_LOG_FD "\
1468 $libc_seen_a$libc_seen_b from:
1469 $ac_try"
1470 ;;
1471 esac
1472 fi
1473 rm -f conftest*])
1474 use_default_link=$libc_cv_use_default_link
1475 fi
1477 AC_CACHE_CHECK(for GLOB_DAT reloc,
1478 libc_cv_has_glob_dat, [dnl
1479 cat > conftest.c <<EOF
1480 extern int mumble;
1481 int foo (void) { return mumble; }
1482 EOF
1483 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1484 -fPIC -shared -o conftest.so conftest.c
1485 -nostdlib -nostartfiles $no_ssp
1486 1>&AS_MESSAGE_LOG_FD])
1487 then
1488 dnl look for GLOB_DAT relocation.
1489 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1490 libc_cv_has_glob_dat=yes
1491 else
1492 libc_cv_has_glob_dat=no
1493 fi
1494 else
1495 libc_cv_has_glob_dat=no
1496 fi
1497 rm -f conftest*])
1498 AC_SUBST(libc_cv_has_glob_dat)
1500 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1501 if libc_cv_output_format=`
1502 ${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1503 then
1504 :
1505 else
1506 libc_cv_output_format=
1507 fi
1508 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1509 AC_SUBST(libc_cv_output_format)
1511 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1512 cat > conftest.c <<EOF
1513 int foo;
1514 EOF
1515 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1516 conftest.c 1>&AS_MESSAGE_LOG_FD])
1517 then
1518 libc_cv_fno_toplevel_reorder=yes
1519 else
1520 libc_cv_fno_toplevel_reorder=no
1521 fi
1522 rm -f conftest*])
1523 if test $libc_cv_fno_toplevel_reorder = yes; then
1524 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1525 else
1526 fno_unit_at_a_time=-fno-unit-at-a-time
1527 fi
1528 AC_SUBST(fno_unit_at_a_time)
1530 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1531 [dnl
1532 cat > conftest.c <<EOF
1533 __thread int i;
1534 void foo (void)
1535 {
1536 i = 10;
1537 }
1538 EOF
1539 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1540 conftest.c 1>&AS_MESSAGE_LOG_FD])
1541 then
1542 libc_cv_mtls_dialect_gnu2=yes
1543 else
1544 libc_cv_mtls_dialect_gnu2=no
1545 fi
1546 rm -f conftest*])
1547 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1548 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1550 AC_CACHE_CHECK(whether cc puts quotes around section names,
1551 libc_cv_have_section_quotes,
1552 [cat > conftest.c <<EOF
1553 static const int foo
1554 __attribute__ ((section ("bar"))) = 1;
1555 EOF
1556 if ${CC-cc} -S conftest.c -o conftest.s; then
1557 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1558 libc_cv_have_section_quotes=yes
1559 else
1560 libc_cv_have_section_quotes=no
1561 fi
1562 else
1563 libc_cv_have_section_quotes=unknown
1564 fi
1565 rm -f conftest.{c,s}
1566 ])
1567 if test $libc_cv_have_section_quotes = yes; then
1568 AC_DEFINE(HAVE_SECTION_QUOTES)
1569 fi
1571 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1572 cat > conftest.c <<\EOF
1573 void zero (void *x)
1574 {
1575 __builtin_memset (x, 0, 1000);
1576 }
1577 EOF
1578 dnl
1579 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1580 then
1581 libc_cv_gcc_builtin_memset=no
1582 else
1583 libc_cv_gcc_builtin_memset=yes
1584 fi
1585 rm -f conftest* ])
1586 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1587 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1588 fi
1590 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1591 cat > conftest.c <<\EOF
1592 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1593 char *foo (const char *a, const char *b)
1594 {
1595 return __builtin_strstr (a, b);
1596 }
1597 EOF
1598 dnl
1599 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1600 then
1601 libc_cv_gcc_builtin_redirection=yes
1602 else
1603 libc_cv_gcc_builtin_redirection=no
1604 fi
1605 rm -f conftest* ])
1606 if test "$libc_cv_gcc_builtin_redirection" = no; then
1607 AC_MSG_ERROR([support for the symbol redirection needed])
1608 fi
1610 dnl Determine how to disable generation of FMA instructions.
1611 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1612 libc_cv_cc_nofma, [dnl
1613 libc_cv_cc_nofma=
1614 for opt in -ffp-contract=off -mno-fused-madd; do
1615 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1616 done])
1617 AC_SUBST(libc_cv_cc_nofma)
1619 if test -n "$submachine"; then
1620 AC_CACHE_CHECK([for compiler option for CPU variant],
1621 libc_cv_cc_submachine, [dnl
1622 libc_cv_cc_submachine=no
1623 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1624 LIBC_TRY_CC_OPTION([$opt], [
1625 libc_cv_cc_submachine="$opt"
1626 break], [])
1627 done])
1628 if test "x$libc_cv_cc_submachine" = xno; then
1629 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1630 fi
1631 fi
1632 AC_SUBST(libc_cv_cc_submachine)
1634 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1635 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1636 cat > conftest.c <<EOF
1637 void
1638 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1639 foo (void) {}
1640 EOF
1641 libc_cv_cc_loop_to_function=no
1642 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1643 then
1644 libc_cv_cc_loop_to_function=yes
1645 fi
1646 rm -f conftest*])
1647 if test $libc_cv_cc_loop_to_function = yes; then
1648 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1649 fi
1650 AC_SUBST(libc_cv_cc_loop_to_function)
1652 dnl Check whether we have the gd library available.
1653 AC_MSG_CHECKING(for libgd)
1654 if test "$with_gd" != "no"; then
1655 old_CFLAGS="$CFLAGS"
1656 CFLAGS="$CFLAGS $libgd_include"
1657 old_LDFLAGS="$LDFLAGS"
1658 LDFLAGS="$LDFLAGS $libgd_ldflags"
1659 old_LIBS="$LIBS"
1660 LIBS="$LIBS -lgd -lpng -lz -lm"
1661 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1662 CFLAGS="$old_CFLAGS"
1663 LDFLAGS="$old_LDFLAGS"
1664 LIBS="$old_LIBS"
1665 else
1666 LIBGD=no
1667 fi
1668 AC_MSG_RESULT($LIBGD)
1669 AC_SUBST(LIBGD)
1671 # SELinux detection
1672 if test x$with_selinux = xno ; then
1673 have_selinux=no;
1674 else
1675 # See if we have the SELinux library
1676 AC_CHECK_LIB(selinux, is_selinux_enabled,
1677 have_selinux=yes, have_selinux=no)
1678 if test x$with_selinux = xyes ; then
1679 if test x$have_selinux = xno ; then
1680 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1681 fi
1682 fi
1683 fi
1684 # Check if we're building with SELinux support.
1685 if test "x$have_selinux" = xyes; then
1686 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1688 # See if we have the libaudit library
1689 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1690 have_libaudit=yes, have_libaudit=no)
1691 if test "x$have_libaudit" = xyes; then
1692 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1693 fi
1694 AC_SUBST(have_libaudit)
1696 # See if we have the libcap library
1697 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1698 if test "x$have_libcap" = xyes; then
1699 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1700 fi
1701 AC_SUBST(have_libcap)
1702 fi
1703 AC_SUBST(have_selinux)
1705 CPPUNDEFS=
1706 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1707 dnl Since we are building the implementations of the fortified functions here,
1708 dnl having the macro defined interacts very badly.
1709 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1710 [AC_TRY_COMPILE([], [
1711 #ifdef _FORTIFY_SOURCE
1712 # error bogon
1713 #endif],
1714 [libc_cv_predef_fortify_source=no],
1715 [libc_cv_predef_fortify_source=yes])])
1716 if test $libc_cv_predef_fortify_source = yes; then
1717 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1718 fi
1719 AC_SUBST(CPPUNDEFS)
1721 # Some linkers on some architectures support __ehdr_start but with
1722 # bugs. Make sure usage of it does not create relocations in the
1723 # output (as the linker should resolve them all for us).
1724 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1725 libc_cv_ehdr_start, [
1726 old_CFLAGS="$CFLAGS"
1727 old_LDFLAGS="$LDFLAGS"
1728 old_LIBS="$LIBS"
1729 CFLAGS="$CFLAGS -fPIC"
1730 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
1731 LIBS=
1732 AC_LINK_IFELSE([AC_LANG_SOURCE([
1733 typedef struct {
1734 char foo;
1735 long val;
1736 } Ehdr;
1737 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1738 long ehdr (void) { return __ehdr_start.val; }
1739 ])],
1740 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1741 libc_cv_ehdr_start=broken
1742 else
1743 libc_cv_ehdr_start=yes
1744 fi], [libc_cv_ehdr_start=no])
1745 CFLAGS="$old_CFLAGS"
1746 LDFLAGS="$old_LDFLAGS"
1747 LIBS="$old_LIBS"
1748 ])
1749 if test "$libc_cv_ehdr_start" = yes; then
1750 AC_DEFINE([HAVE_EHDR_START])
1751 elif test "$libc_cv_ehdr_start" = broken; then
1752 AC_MSG_WARN([linker is broken -- you should upgrade])
1753 fi
1755 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1756 libc_cv_builtin_trap, [dnl
1757 libc_cv_builtin_trap=no
1758 AC_TRY_COMPILE([], [__builtin_trap ()], [
1759 libc_undefs=`$NM -u conftest.o |
1760 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1761 2>&AS_MESSAGE_LOG_FD` || {
1762 AC_MSG_ERROR([confusing output from $NM -u])
1763 }
1764 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1765 if test -z "$libc_undefs"; then
1766 libc_cv_builtin_trap=yes
1767 fi])])
1768 if test $libc_cv_builtin_trap = yes; then
1769 AC_DEFINE([HAVE_BUILTIN_TRAP])
1770 fi
1772 dnl C++ feature tests.
1773 AC_LANG_PUSH([C++])
1775 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1776 libc_cv_cxx_thread_local, [
1777 old_CXXFLAGS="$CXXFLAGS"
1778 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1779 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1780 #include <thread>
1782 // Compiler support.
1783 struct S
1784 {
1785 S ();
1786 ~S ();
1787 };
1788 thread_local S s;
1789 S * get () { return &s; }
1791 // libstdc++ support.
1792 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1793 #error __cxa_thread_atexit_impl not supported
1794 #endif
1795 ])],
1796 [libc_cv_cxx_thread_local=yes],
1797 [libc_cv_cxx_thread_local=no])
1798 CXXFLAGS="$old_CXXFLAGS"
1799 ])
1800 AC_SUBST(libc_cv_cxx_thread_local)
1802 AC_LANG_POP([C++])
1803 dnl End of C++ feature tests.
1805 ### End of automated tests.
1806 ### Now run sysdeps configure fragments.
1808 # They also can set these variables.
1809 use_ldconfig=no
1810 ldd_rewrite_script=no
1811 libc_cv_sysconfdir=$sysconfdir
1812 libc_cv_localstatedir=$localstatedir
1813 libc_cv_gcc_unwind_find_fde=no
1814 libc_cv_idn=no
1816 # Iterate over all the sysdep directories we will use, running their
1817 # configure fragments.
1818 for dir in $sysnames; do
1819 case $dir in
1820 /*) dest=$dir ;;
1821 *) dest=$srcdir/$dir ;;
1822 esac
1823 if test -r $dest/configure; then
1824 AC_MSG_RESULT(running configure fragment for $dir)
1825 . $dest/configure
1826 fi
1827 done
1829 if test x"$build_mathvec" = xnotset; then
1830 build_mathvec=no
1831 fi
1832 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1834 AC_SUBST(libc_extra_cflags)
1835 AC_SUBST(libc_extra_cppflags)
1837 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1838 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1839 fi
1840 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1842 # A sysdeps configure fragment can reset this if IFUNC is not actually
1843 # usable even though the assembler knows how to generate the symbol type.
1844 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1845 AC_DEFINE(HAVE_IFUNC)
1846 fi
1848 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1849 AC_DEFINE(HAVE_GCC_IFUNC)
1850 fi
1852 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1853 # configure fragment can override the value to prevent this AC_DEFINE.
1854 AC_SUBST(use_nscd)
1855 if test "x$use_nscd" != xno; then
1856 AC_DEFINE([USE_NSCD])
1857 fi
1858 if test "x$build_nscd" = xdefault; then
1859 build_nscd=$use_nscd
1860 fi
1862 AC_SUBST(libc_cv_slibdir)
1863 AC_SUBST(libc_cv_rtlddir)
1864 AC_SUBST(libc_cv_complocaledir)
1865 AC_SUBST(libc_cv_sysconfdir)
1866 AC_SUBST(libc_cv_localstatedir)
1867 AC_SUBST(libc_cv_rootsbindir)
1869 if test x$use_ldconfig = xyes; then
1870 AC_DEFINE(USE_LDCONFIG)
1871 fi
1872 AC_SUBST(use_ldconfig)
1873 AC_SUBST(ldd_rewrite_script)
1875 AC_SUBST(static)
1876 AC_SUBST(shared)
1878 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1879 [libc_cv_pic_default=yes
1880 cat > conftest.c <<EOF
1881 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1882 # error PIC is default.
1883 #endif
1884 EOF
1885 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1886 libc_cv_pic_default=no
1887 fi
1888 rm -f conftest.*])
1889 AC_SUBST(libc_cv_pic_default)
1891 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1892 [libc_cv_pie_default=yes
1893 cat > conftest.c <<EOF
1894 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1895 # error PIE is default.
1896 #endif
1897 EOF
1898 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1899 libc_cv_pie_default=no
1900 fi
1901 rm -f conftest.*])
1902 AC_SUBST(libc_cv_pie_default)
1904 AC_SUBST(profile)
1905 AC_SUBST(static_nss)
1907 AC_SUBST(DEFINES)
1909 dnl See sysdeps/mach/configure.ac for this variable.
1910 AC_SUBST(mach_interface_list)
1912 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1913 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1914 AC_SUBST(VERSION)
1915 AC_SUBST(RELEASE)
1917 AC_CONFIG_FILES([config.make Makefile])
1918 AC_CONFIG_COMMANDS([default],[[
1919 case $CONFIG_FILES in *config.make*)
1920 echo "$config_vars" >> config.make;;
1921 esac
1922 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1923 AC_OUTPUT