| blob | d719fadeef3f438683c4261be673c66a40e614b1 |
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$bindnow" = xyes; then
235 AC_DEFINE(BIND_NOW)
236 fi
238 dnl On some platforms we cannot use dynamic loading. We must provide
239 dnl static NSS modules.
240 AC_ARG_ENABLE([static-nss],
241 AC_HELP_STRING([--enable-static-nss],
242 [build static NSS modules @<:@default=no@:>@]),
243 [static_nss=$enableval],
244 [static_nss=no])
245 dnl Enable static NSS also if we build no shared objects.
246 if test x"$static_nss" = xyes || test x"$shared" = xno; then
247 static_nss=yes
248 AC_DEFINE(DO_STATIC_NSS)
249 fi
251 AC_ARG_ENABLE([force-install],
252 AC_HELP_STRING([--disable-force-install],
253 [don't force installation of files from this package, even if they are older than the installed files]),
254 [force_install=$enableval],
255 [force_install=yes])
256 AC_SUBST(force_install)
258 AC_ARG_ENABLE([maintainer-mode],
259 AC_HELP_STRING([--enable-maintainer-mode],
260 [enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
261 [maintainer=$enableval],
262 [maintainer=no])
264 dnl On some platforms we allow dropping compatibility with all kernel
265 dnl versions.
266 AC_ARG_ENABLE([kernel],
267 AC_HELP_STRING([--enable-kernel=VERSION],
268 [compile for compatibility with kernel not older than VERSION]),
269 [minimum_kernel=$enableval],
270 [])
271 dnl Prevent unreasonable values.
272 if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
273 # Better nothing than this.
274 minimum_kernel=""
275 else
276 if test "$minimum_kernel" = current; then
277 minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
278 fi
279 fi
281 dnl For the development we sometimes want gcc to issue even more warnings.
282 dnl This is not the default since many of the extra warnings are not
283 dnl appropriate.
284 AC_ARG_ENABLE([all-warnings],
285 AC_HELP_STRING([--enable-all-warnings],
286 [enable all useful warnings gcc can issue]),
287 [all_warnings=$enableval],
288 [])
289 AC_SUBST(all_warnings)
291 AC_ARG_ENABLE([werror],
292 AC_HELP_STRING([--disable-werror],
293 [do not build with -Werror]),
294 [enable_werror=$enableval],
295 [enable_werror=yes])
296 AC_SUBST(enable_werror)
298 AC_ARG_ENABLE([multi-arch],
299 AC_HELP_STRING([--enable-multi-arch],
300 [enable single DSO with optimizations for multiple architectures]),
301 [multi_arch=$enableval],
302 [multi_arch=default])
304 AC_ARG_ENABLE([nss-crypt],
305 AC_HELP_STRING([--enable-nss-crypt],
306 [enable libcrypt to use nss]),
307 [nss_crypt=$enableval],
308 [nss_crypt=no])
309 if test x$nss_crypt = xyes; then
310 nss_includes=-I$(nss-config --includedir 2>/dev/null)
311 if test $? -ne 0; then
312 AC_MSG_ERROR([cannot find include directory with nss-config])
313 fi
314 old_CFLAGS="$CFLAGS"
315 CFLAGS="$CFLAGS $nss_includes"
316 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
317 #include <hasht.h>
318 #include <nsslowhash.h>
319 void f (void) { NSSLOW_Init (); }])],
320 libc_cv_nss_crypt=yes,
321 AC_MSG_ERROR([
322 cannot find NSS headers with lowlevel hash function interfaces]))
323 old_LIBS="$LIBS"
324 old_LDFLAGS="$LDFLAGS"
325 LIBS="$LIBS -lfreebl3"
326 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
327 #include <hasht.h>
328 #include <nsslowhash.h>],
329 [NSSLOW_Init();])],
330 libc_cv_nss_crypt=yes,
331 AC_MSG_ERROR([
332 cannot link program using lowlevel NSS hash functions]))
333 # Check to see if there is a static NSS cryptographic library.
334 # If there isn't then we can't link anything with libcrypt.a,
335 # and that might mean disabling some static tests.
336 LDFLAGS="$LDFLAGS -static"
337 AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
338 #include <hasht.h>
339 #include <nsslowhash.h>],
340 [NSSLOW_Init();])],
341 libc_cv_static_nss_crypt=yes,
342 libc_cv_static_nss_crypt=no)
343 LDFLAGS="$old_LDFLAGS"
344 CFLAGS="$old_CFLAGS"
345 LIBS="$old_LIBS"
346 else
347 libc_cv_nss_crypt=no
348 libc_cv_static_nss_crypt=no
349 fi
350 AC_SUBST(libc_cv_nss_crypt)
351 AC_SUBST(libc_cv_static_nss_crypt)
354 AC_ARG_ENABLE([obsolete-rpc],
355 AC_HELP_STRING([--enable-obsolete-rpc],
356 [build and install the obsolete RPC code for link-time usage]),
357 [link_obsolete_rpc=$enableval],
358 [link_obsolete_rpc=no])
359 AC_SUBST(link_obsolete_rpc)
361 if test "$link_obsolete_rpc" = yes; then
362 AC_DEFINE(LINK_OBSOLETE_RPC)
363 fi
365 AC_ARG_ENABLE([systemtap],
366 [AS_HELP_STRING([--enable-systemtap],
367 [enable systemtap static probe points @<:@default=no@:>@])],
368 [systemtap=$enableval],
369 [systemtap=no])
370 if test "x$systemtap" != xno; then
371 AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
372 old_CFLAGS="$CFLAGS"
373 CFLAGS="-std=gnu11 $CFLAGS"
374 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
375 void foo (int i, void *p)
376 {
377 asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
378 :: STAP_PROBE_ASM_OPERANDS (2, i, p));
379 }]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
380 CFLAGS="$old_CFLAGS"])
381 if test $libc_cv_sdt = yes; then
382 AC_DEFINE([USE_STAP_PROBE])
383 elif test "x$systemtap" != xauto; then
384 AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
385 fi
386 fi
388 AC_ARG_ENABLE([build-nscd],
389 [AS_HELP_STRING([--disable-build-nscd],
390 [disable building and installing the nscd daemon])],
391 [build_nscd=$enableval],
392 [build_nscd=default])
393 AC_SUBST(build_nscd)
395 # Note the use of $use_nscd is near the bottom of the file.
396 AC_ARG_ENABLE([nscd],
397 [AS_HELP_STRING([--disable-nscd],
398 [library functions will not contact the nscd daemon])],
399 [use_nscd=$enableval],
400 [use_nscd=yes])
402 AC_ARG_ENABLE([pt_chown],
403 [AS_HELP_STRING([--enable-pt_chown],
404 [Enable building and installing pt_chown])],
405 [build_pt_chown=$enableval],
406 [build_pt_chown=no])
407 AC_SUBST(build_pt_chown)
408 if test "$build_pt_chown" = yes; then
409 AC_DEFINE(HAVE_PT_CHOWN)
410 fi
412 # The abi-tags file uses a fairly simplistic model for name recognition that
413 # can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
414 # $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
415 # This doesn't get used much beyond that, so it's fairly safe.
416 case "$host_os" in
417 linux*)
418 ;;
419 gnu*)
420 host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
421 ;;
422 esac
424 AC_ARG_ENABLE([mathvec],
425 [AS_HELP_STRING([--enable-mathvec],
426 [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
427 [build_mathvec=$enableval],
428 [build_mathvec=notset])
430 # We keep the original values in `$config_*' and never modify them, so we
431 # can write them unchanged into config.make. Everything else uses
432 # $machine, $vendor, and $os, and changes them whenever convenient.
433 config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
435 # Don't allow vendor == "unknown"
436 test "$config_vendor" = unknown && config_vendor=
437 config_os="`echo $config_os | sed 's/^unknown-//'`"
439 # Some configurations imply other options.
440 elf=yes
442 # The configure fragment of an add-on port can modify these to supplement
443 # or override the table in the case statement below. No fragment should
444 # ever change the config_* variables, however.
445 machine=$config_machine
446 vendor=$config_vendor
447 os=$config_os
448 base_os=''
450 submachine=
451 AC_ARG_WITH([cpu],
452 AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
453 [dnl
454 case "$withval" in
455 yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
456 no) ;;
457 *) submachine="$withval" ;;
458 esac
459 ])
461 # An preconfigure script can set this when it wants to disable the sanity
462 # check below.
463 libc_config_ok=no
465 dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
466 LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
468 dnl Having this here, though empty, makes sure that if add-ons' fragments
469 dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
470 dnl our AC_OUTPUT will actually use it.
471 AC_CONFIG_SUBDIRS()
473 case "$enable_add_ons" in
474 ''|no) add_ons= ;;
475 yes|'*')
476 add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
477 sed 's@/[[^/]]*$@@' | sort | uniq`
478 add_ons_automatic=yes
479 ;;
480 *) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
481 add_ons_automatic=no ;;
482 esac
484 configured_add_ons=
485 add_ons_sfx=
486 add_ons_pfx=
487 if test x"$add_ons" != x; then
488 for f in $add_ons; do
489 # Some sanity checks
490 case "$f" in
491 crypt)
492 AC_MSG_ERROR([
493 *** It seems that you're using an old \`crypt' add-on. crypt is now
494 *** part of glibc and using the old add-on will not work with this
495 *** release. Start again with fresh sources and without the old
496 *** \`crypt' add-on.])
497 ;;
498 localedata)
499 AC_MSG_ERROR([
500 *** It seems that you're using an old \`localedata' add-on. localedata
501 *** is now part of glibc and using the old add-on will not work with
502 *** this release. Start again with fresh sources and without the old
503 *** \`localedata' add-on.])
504 ;;
505 esac
506 done
508 # Now source each add-on's configure fragment.
509 # The fragments can use $srcdir/$libc_add_on to find themselves,
510 # and test $add_ons_automatic to see if they were explicitly requested.
511 # A fragment can clear (or even change) $libc_add_on to affect
512 # whether it goes into the list to be actually used in the build.
513 use_add_ons=
514 for libc_add_on in $add_ons; do
515 # Test whether such a directory really exists.
516 # It can be absolute, or relative to $srcdir, or relative to the build dir.
517 case "$libc_add_on" in
518 /*)
519 libc_add_on_srcdir=$libc_add_on
520 ;;
521 *)
522 test -d "$srcdir/$libc_add_on" || {
523 if test -d "$libc_add_on"; then
524 libc_add_on="`pwd`/$libc_add_on"
525 else
526 AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
527 fi
528 }
529 libc_add_on_srcdir=$srcdir/$libc_add_on
530 ;;
531 esac
533 libc_add_on_frag=$libc_add_on_srcdir/configure
534 libc_add_on_canonical=
535 libc_add_on_config_subdirs=
536 if test -r "$libc_add_on_frag"; then
537 AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
538 libc_add_on_canonical=unknown
539 libc_add_on_subdirs=
540 . "$libc_add_on_frag"
541 test -z "$libc_add_on" || {
542 configured_add_ons="$configured_add_ons $libc_add_on"
543 if test "x$libc_add_on_canonical" = xunknown; then
544 AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
545 fi
546 for d in $libc_add_on_subdirs; do
547 case "$libc_add_on" in
548 /*) subdir_srcdir="$libc_add_on" ;;
549 *) subdir_srcdir="\$(..)$libc_add_on" ;;
550 esac
551 case "$d" in
552 .)
553 d="${libc_add_on_canonical:-$libc_add_on}"
554 ;;
555 /*)
556 subdir_srcdir="$d"
557 ;;
558 *)
559 subdir_srcdir="$subdir_srcdir/$d"
560 ;;
561 esac
562 d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
563 add_on_subdirs="$add_on_subdirs $d"
564 test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
565 $d-srcdir = $subdir_srcdir"
566 done
567 for d in $libc_add_on_config_subdirs; do
568 case "$d" in
569 /*) AC_MSG_ERROR(dnl
570 fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
571 esac
572 if test ! -d "$libc_add_on_srcdir/$d"; then
573 AC_MSG_ERROR(fragment wants to configure missing directory $d)
574 fi
575 case "$libc_add_on" in
576 /*) AC_MSG_ERROR(dnl
577 relative path required for add-on using \$libc_add_on_config_subdirs) ;;
578 esac
579 subdirs="$subdirs $libc_add_on/$d"
580 done
581 }
582 fi
583 if test -n "$libc_add_on"; then
584 LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
585 use_add_ons="$use_add_ons $libc_add_on"
586 add_ons_pfx="$add_ons_pfx $libc_add_on/"
587 test -z "$libc_add_on_canonical" ||
588 add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
589 fi
590 done
591 # Use echo to strip excess whitespace.
592 add_ons="`echo $use_add_ons`"
593 fi
594 AC_SUBST(add_ons)
595 AC_SUBST(add_on_subdirs)
598 ###
599 ### By using the undocumented --enable-hacker-mode option for configure
600 ### one can skip this test to make the configuration not fail for unsupported
601 ### platforms.
602 ###
603 if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
604 case "$machine-$host_os" in
605 *-linux* | *-gnu*)
606 ;;
607 *)
608 AC_MSG_ERROR([
609 *** The GNU C library is currently unavailable for this platform.
610 *** If you are interested in seeing glibc on this platform visit
611 *** the "How to submit a new port" in the wiki:
612 *** https://sourceware.org/glibc/wiki/#Development
613 *** and join the community!])
614 ;;
615 esac
616 fi
618 # Set base_machine if not set by a preconfigure fragment.
619 test -n "$base_machine" || base_machine=$machine
620 AC_SUBST(base_machine)
622 # For the multi-arch option we need support in the assembler & linker.
623 AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
624 libc_cv_ld_gnu_indirect_function, [dnl
625 cat > conftest.S <<EOF
626 .type foo,%gnu_indirect_function
627 foo:
628 .globl _start
629 _start:
630 .globl __start
631 __start:
632 .data
633 #ifdef _LP64
634 .quad foo
635 #else
636 .long foo
637 #endif
638 EOF
639 libc_cv_ld_gnu_indirect_function=no
640 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
641 -nostartfiles -nostdlib \
642 -o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
643 # Do a link to see if the backend supports IFUNC relocs.
644 $READELF -r conftest 1>&AS_MESSAGE_LOG_FD
645 LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || {
646 libc_cv_ld_gnu_indirect_function=yes
647 }
648 fi
649 rm -f conftest*])
651 # Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
652 AC_CACHE_CHECK([for gcc attribute ifunc support],
653 libc_cv_gcc_indirect_function, [dnl
654 cat > conftest.c <<EOF
655 extern int func (int);
656 int used_func (int a)
657 {
658 return a;
659 }
660 static void *resolver ()
661 {
662 return &used_func;
663 }
664 extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
665 EOF
666 libc_cv_gcc_indirect_function=no
667 if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
668 2>&AS_MESSAGE_LOG_FD ; then
669 if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
670 libc_cv_gcc_indirect_function=yes
671 fi
672 fi
673 rm -f conftest*])
675 if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
676 if test x"$multi_arch" = xyes; then
677 AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
678 else
679 multi_arch=no
680 fi
681 fi
682 if test x"$libc_cv_gcc_indirect_function" != xyes &&
683 test x"$multi_arch" = xyes; then
684 AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
685 Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
686 fi
687 multi_arch_d=
688 if test x"$multi_arch" != xno; then
689 multi_arch_d=/multiarch
690 fi
692 # Compute the list of sysdep directories for this configuration.
693 # This can take a while to compute.
694 sysdep_dir=$srcdir/sysdeps
695 AC_MSG_CHECKING(sysdep dirs)
696 dnl We need to use [ and ] for other purposes for a while now.
697 changequote(,)dnl
698 # Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
699 os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
701 test "x$base_os" != x || case "$os" in
702 gnu*)
703 base_os=mach/hurd ;;
704 linux*)
705 base_os=unix/sysv ;;
706 esac
708 # For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
709 tail=$os
710 ostry=$os
711 while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
712 ostry="$ostry /$o"
713 tail=$o
714 done
715 o=`echo $tail | sed 's/[0-9]*$//'`
716 if test $o != $tail; then
717 ostry="$ostry /$o"
718 fi
719 # For linux-gnu, try linux-gnu, then linux.
720 o=`echo $tail | sed 's/-.*$//'`
721 if test $o != $tail; then
722 ostry="$ostry /$o"
723 fi
725 # For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
726 base=
727 tail=$base_os
728 while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
729 set $b
730 base="$base /$1"
731 tail="$2"
732 done
734 # For sparc/sparc32, try sparc/sparc32 and then sparc.
735 mach=
736 tail=$machine${submachine:+/$submachine}
737 while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
738 set $m
739 # Prepend the machine's FPU directory unless --without-fp.
740 if test "$with_fp" = yes; then
741 maybe_fpu=/fpu
742 else
743 maybe_fpu=/nofpu
744 fi
745 # For each machine term, try it with and then without /multiarch.
746 for try_fpu in $maybe_fpu ''; do
747 for try_multi in $multi_arch_d ''; do
748 mach="$mach /$1$try_fpu$try_multi"
749 done
750 done
751 tail="$2"
752 done
754 dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
755 changequote([,])dnl
757 # Find what sysdep directories exist.
758 sysnames_add_ons=
759 sysnames=
760 for b in $base ''; do
761 for m0 in $mach ''; do
762 for v in /$vendor ''; do
763 test "$v" = / && continue
764 for o in /$ostry ''; do
765 test "$o" = / && continue
766 for m in $mach ''; do
767 for d in $add_ons_pfx ''; do
768 for a in $add_ons_sfx ''; do
769 try_suffix="$m0$b$v$o$m"
770 if test -n "$try_suffix"; then
771 try_srcdir="${srcdir}/"
772 case "$d" in
773 /*) try_srcdir= ;;
774 esac
775 try="${d}sysdeps$try_suffix$a"
776 test -n "$enable_debug_configure" &&
777 echo "$0 [DEBUG]: try $try" >&2
778 if test -d "$try_srcdir$try"; then
779 sysnames="$sysnames $try"
780 { test -n "$o" || test -n "$b"; } && os_used=t
781 { test -n "$m" || test -n "$m0"; } && machine_used=t
782 case x${m0:-$m} in
783 x*/$submachine) submachine_used=t ;;
784 esac
785 if test -n "$d"; then
786 case "$sysnames_add_ons" in
787 *" $d "*) ;;
788 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
789 esac
790 fi
791 fi
792 fi
793 done
794 done
795 done
796 done
797 done
798 done
799 done
801 # If the assembler supports gnu_indirect_function symbol type and the
802 # architecture supports multi-arch, we enable multi-arch by default.
803 case $sysnames_add_ons$sysnames in
804 *"$multi_arch_d"*)
805 ;;
806 *)
807 test x"$multi_arch" = xdefault && multi_arch=no
808 ;;
809 esac
810 if test x"$multi_arch" != xno; then
811 AC_DEFINE(USE_MULTIARCH)
812 fi
813 AC_SUBST(multi_arch)
815 if test -z "$os_used" && test "$os" != none; then
816 AC_MSG_ERROR(Operating system $os is not supported.)
817 fi
818 if test -z "$machine_used" && test "$machine" != none; then
819 AC_MSG_ERROR(The $machine is not supported.)
820 fi
821 if test -z "$submachine_used" && test -n "$submachine"; then
822 AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
823 fi
824 AC_SUBST(submachine)
826 # We have now validated the configuration.
828 # Expand the list of system names into a full list of directories
829 # from each element's parent name and Implies file (if present).
830 set $sysnames
831 names=
832 while test $# -gt 0; do
833 name=$1
834 shift
836 case " $names " in *" $name "*)
837 # Already in the list.
838 continue
839 esac
841 # Report each name as we discover it, so there is no long pause in output.
842 echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
844 name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
846 case $name in
847 /*) xsrcdir= ;;
848 *) xsrcdir=$srcdir/ ;;
849 esac
850 test -n "$enable_debug_configure" &&
851 echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
853 for implies_file in Implies Implies-before Implies-after; do
854 implies_type=`echo $implies_file | sed s/-/_/`
855 eval ${implies_type}=
856 if test -f $xsrcdir$name/$implies_file; then
857 # Collect more names from the `Implies' file (removing comments).
858 implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
859 for x in $implied_candidate; do
860 found=no
861 if test -d $xsrcdir$name_base/$x; then
862 eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
863 found=yes
864 fi
865 for d in $add_ons_pfx ''; do
866 try="${d}sysdeps/$x"
867 case $d in
868 /*) try_srcdir= ;;
869 *) try_srcdir=$srcdir/ ;;
870 esac
871 test -n "$enable_debug_configure" &&
872 echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
873 if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
874 then
875 eval "${implies_type}=\"\$${implies_type} \$try\""
876 found=yes
877 case "$sysnames_add_ons" in
878 *" $d "*) ;;
879 *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
880 esac
881 fi
882 done
883 if test $found = no; then
884 AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
885 fi
886 done
887 fi
888 done
890 # Add NAME to the list of names.
891 names="$names $name"
893 # Find the parent of NAME, using the empty string if it has none.
894 changequote(,)dnl
895 parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
896 changequote([,])dnl
898 test -n "$enable_debug_configure" &&
899 echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
900 Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2
902 # Add the names implied by NAME, and NAME's parent (if it has one), to
903 # the list of names to be processed (the argument list). We prepend the
904 # implied names to the list and append the parent. We want implied
905 # directories to come before further directories inferred from the
906 # configuration components; this ensures that for sysv4, unix/common
907 # (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
908 # after sysv4).
909 sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
910 test -n "$sysnames" && set $sysnames
911 done
913 # Add the default directories.
914 default_sysnames="sysdeps/generic"
915 sysnames="$names $default_sysnames"
916 AC_SUBST(sysnames)
917 # The other names were emitted during the scan.
918 AC_MSG_RESULT($default_sysnames)
920 # Collect the list of add-ons that supply partial sysdeps trees.
921 sysdeps_add_ons=
922 for add_on in $add_ons; do
923 case "$add_on" in
924 /*) xsrcdir= ;;
925 *) xsrcdir="$srcdir/" ;;
926 esac
928 test -d "$xsrcdir$add_on/sysdeps" || {
929 case "$configured_add_ons " in
930 *" $add_on "*) ;;
931 *|'')
932 AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
933 ;;
934 esac
935 continue
936 }
938 sysdeps_add_ons="$sysdeps_add_ons $add_on"
939 case "$sysnames_add_ons" in
940 *" $add_on/ "*) ;;
941 *|'')
942 AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
943 continue ;;
944 esac
946 found=no
947 for d in $sysnames; do
948 case "$d" in
949 $add_on/sysdeps/*) ;;
950 *) continue ;;
951 esac
952 (cd "$xsrcdir$d" && for f in *[[!~]]; do
953 case "$f" in
954 sys|bits)
955 for ff in $f/*.h; do
956 test -d "$ff" || { test -e "$ff" && exit 88; }
957 done
958 ;;
959 *)
960 test -d "$f" || { test -e "$f" && exit 88; }
961 ;;
962 esac
963 done)
964 if test $? -eq 88; then
965 found=yes
966 break
967 fi
968 done
969 if test $found = no; then
970 AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
971 fi
972 done
973 AC_SUBST(sysdeps_add_ons)
976 ### Locate tools.
978 AC_PROG_INSTALL
979 if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
980 # The makefiles need to use a different form to find it in $srcdir.
981 INSTALL='\$(..)./scripts/install-sh -c'
982 fi
983 AC_PROG_LN_S
985 LIBC_PROG_BINUTILS
987 # Accept binutils 2.22 or newer.
988 AC_CHECK_PROG_VER(AS, $AS, --version,
989 [GNU assembler.* \([0-9]*\.[0-9.]*\)],
990 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
991 AS=: critic_missing="$critic_missing as")
992 AC_CHECK_PROG_VER(LD, $LD, --version,
993 [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
994 [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
995 LD=: critic_missing="$critic_missing ld")
997 # These programs are version sensitive.
998 AC_CHECK_TOOL_PREFIX
999 AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
1000 [GNU Make[^0-9]*\([0-9][0-9.]*\)],
1001 [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
1003 AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
1004 [GNU gettext.* \([0-9]*\.[0-9.]*\)],
1005 [0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
1006 MSGFMT=: aux_missing="$aux_missing msgfmt")
1007 AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
1008 [GNU texinfo.* \([0-9][0-9.]*\)],
1009 [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
1010 MAKEINFO=: aux_missing="$aux_missing makeinfo")
1011 AC_CHECK_PROG_VER(SED, sed, --version,
1012 [GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
1013 [3.0[2-9]*|3.[1-9]*|[4-9]*],
1014 SED=: aux_missing="$aux_missing sed")
1015 AC_CHECK_PROG_VER(AWK, gawk, --version,
1016 [GNU Awk[^0-9]*\([0-9][0-9.]*\)],
1017 [3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
1019 AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
1020 AC_TRY_COMPILE([], [
1021 #if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
1022 #error insufficient compiler
1023 #endif],
1024 [libc_cv_compiler_ok=yes],
1025 [libc_cv_compiler_ok=no])])
1026 AS_IF([test $libc_cv_compiler_ok != yes],
1027 [critic_missing="$critic_missing compiler"])
1029 AC_CHECK_TOOL(NM, nm, false)
1031 if test "x$maintainer" = "xyes"; then
1032 AC_CHECK_PROGS(AUTOCONF, autoconf, no)
1033 case "x$AUTOCONF" in
1034 xno|x|x:) AUTOCONF=no ;;
1035 *)
1036 AC_CACHE_CHECK(dnl
1037 whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
1038 if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
1039 libc_cv_autoconf_works=yes
1040 else
1041 libc_cv_autoconf_works=no
1042 fi])
1043 test $libc_cv_autoconf_works = yes || AUTOCONF=no
1044 ;;
1045 esac
1046 if test "x$AUTOCONF" = xno; then
1047 aux_missing="$aux_missing autoconf"
1048 fi
1049 else
1050 AUTOCONF=no
1051 fi
1053 test -n "$critic_missing" && AC_MSG_ERROR([
1054 *** These critical programs are missing or too old:$critic_missing
1055 *** Check the INSTALL file for required versions.])
1057 test -n "$aux_missing" && AC_MSG_WARN([
1058 *** These auxiliary programs are missing or incompatible versions:$aux_missing
1059 *** some features will be disabled.
1060 *** Check the INSTALL file for required versions.])
1062 # if using special system headers, find out the compiler's sekrit
1063 # header directory and add that to the list. NOTE: Only does the right
1064 # thing on a system that doesn't need fixincludes. (Not presently a problem.)
1065 if test -n "$sysheaders"; then
1066 SYSINCLUDES=-nostdinc
1067 for d in include include-fixed; do
1068 i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
1069 SYSINCLUDES="$SYSINCLUDES -isystem $i"
1070 done
1071 SYSINCLUDES="$SYSINCLUDES \
1072 -isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
1073 if test -n "$CXX"; then
1074 CXX_SYSINCLUDES=
1075 for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
1076 | sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
1077 test "x$cxxheaders" != x &&
1078 CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
1079 done
1080 fi
1081 fi
1082 AC_SUBST(SYSINCLUDES)
1083 AC_SUBST(CXX_SYSINCLUDES)
1085 # Obtain some C++ header file paths. This is used to make a local
1086 # copy of those headers in Makerules.
1087 if test -n "$CXX"; then
1088 find_cxx_header () {
1089 echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}"
1090 }
1091 CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
1092 CXX_CMATH_HEADER="$(find_cxx_header cmath)"
1093 fi
1094 AC_SUBST(CXX_CSTDLIB_HEADER)
1095 AC_SUBST(CXX_CMATH_HEADER)
1097 # Test if LD_LIBRARY_PATH contains the notation for the current directory
1098 # since this would lead to problems installing/building glibc.
1099 # LD_LIBRARY_PATH contains the current directory if one of the following
1100 # is true:
1101 # - one of the terminals (":" and ";") is the first or last sign
1102 # - two terminals occur directly after each other
1103 # - the path contains an element with a dot in it
1104 AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
1105 changequote(,)dnl
1106 case ${LD_LIBRARY_PATH} in
1107 [:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
1108 ld_library_path_setting="contains current directory"
1109 ;;
1110 *)
1111 ld_library_path_setting="ok"
1112 ;;
1113 esac
1114 changequote([,])dnl
1115 AC_MSG_RESULT($ld_library_path_setting)
1116 if test "$ld_library_path_setting" != "ok"; then
1117 AC_MSG_ERROR([
1118 *** LD_LIBRARY_PATH shouldn't contain the current directory when
1119 *** building glibc. Please change the environment variable
1120 *** and run configure again.])
1121 fi
1123 AC_PATH_PROG(BASH_SHELL, bash, no)
1125 AC_PATH_PROG(PERL, perl, no)
1126 if test "$PERL" != no &&
1127 (eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
1128 PERL=no
1129 fi
1130 AC_PATH_PROG(INSTALL_INFO, install-info, no,
1131 $PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
1132 AC_CHECK_PROG_VER(BISON, bison, --version,
1133 [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
1134 [2.7*|[3-9].*|[1-9][0-9]*],
1135 BISON=no)
1137 AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
1138 cat > conftest.s <<EOF
1139 .text
1140 foo:
1141 .set glibc_conftest_frobozz,foo
1142 .globl glibc_conftest_frobozz
1143 EOF
1144 # The alpha-dec-osf1 assembler gives only a warning for `.set'
1145 # (but it doesn't work), so we must do a linking check to be sure.
1146 cat > conftest1.c <<\EOF
1147 extern int glibc_conftest_frobozz;
1148 void _start() { glibc_conftest_frobozz = 1; }
1149 EOF
1150 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
1151 -nostartfiles -nostdlib \
1152 -o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
1153 libc_cv_asm_set_directive=yes
1154 else
1155 libc_cv_asm_set_directive=no
1156 fi
1157 rm -f conftest*])
1158 if test $libc_cv_asm_set_directive = yes; then
1159 AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
1160 fi
1162 AC_CACHE_CHECK(linker support for protected data symbol,
1163 libc_cv_protected_data,
1164 [cat > conftest.c <<EOF
1165 int bar __attribute__ ((visibility ("protected"))) = 1;
1166 EOF
1167 libc_cv_protected_data=no
1168 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
1169 cat > conftest.c <<EOF
1170 extern int bar;
1171 int main (void) { return bar; }
1172 EOF
1173 if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles conftest.c -o conftest conftest.so); then
1174 libc_cv_protected_data=yes
1175 fi
1176 fi
1177 rm -f conftest.*
1178 ])
1179 AC_SUBST(libc_cv_protected_data)
1181 AC_CACHE_CHECK(for broken __attribute__((alias())),
1182 libc_cv_broken_alias_attribute,
1183 [cat > conftest.c <<EOF
1184 extern int foo (int x) __asm ("xyzzy");
1185 int bar (int x) { return x; }
1186 extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
1187 extern int dfoo;
1188 extern __typeof (dfoo) dfoo __asm ("abccb");
1189 int dfoo = 1;
1190 EOF
1191 libc_cv_broken_alias_attribute=yes
1192 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
1193 if grep 'xyzzy' conftest.s >/dev/null &&
1194 grep 'abccb' conftest.s >/dev/null; then
1195 libc_cv_broken_alias_attribute=no
1196 fi
1197 fi
1198 rm -f conftest.c conftest.s
1199 ])
1200 if test $libc_cv_broken_alias_attribute = yes; then
1201 AC_MSG_ERROR(working alias attribute support required)
1202 fi
1204 AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
1205 libc_cv_have_sdata_section,
1206 [echo "int i;" > conftest.c
1207 libc_cv_have_sdata_section=no
1208 if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
1209 | grep '\.sdata' >/dev/null; then
1210 libc_cv_have_sdata_section=yes
1211 fi
1212 rm -f conftest.c conftest.so
1213 ])
1214 if test $libc_cv_have_sdata_section = yes; then
1215 AC_DEFINE(HAVE_SDATA_SECTION)
1216 fi
1218 AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
1219 libc_cv_ctors_header, [dnl
1220 libc_cv_ctors_header=yes
1221 LIBC_TRY_LINK_STATIC([
1222 __attribute__ ((constructor)) void ctor (void) { asm (""); }
1223 __attribute__ ((destructor)) void dtor (void) { asm (""); }
1224 ],
1225 [dnl
1226 AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
1227 { gsub(/\@<:@ */, "@<:@") }
1228 $2 == ".ctors" || $2 == ".dtors" {
1229 size = strtonum("0x" $6)
1230 align = strtonum("0x" $NF)
1231 seen@<:@$2@:>@ = 1
1232 stub@<:@$2@:>@ = size == align * 2
1233 }
1234 END {
1235 ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
1236 dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
1237 exit ((ctors_ok && dtors_ok) ? 0 : 1)
1238 }
1239 '], [libc_cv_ctors_header=no])
1240 ], [dnl
1241 AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
1242 ])
1243 ])
1244 if test $libc_cv_ctors_header = no; then
1245 AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
1246 fi
1248 AC_CACHE_CHECK(for libunwind-support in compiler,
1249 libc_cv_cc_with_libunwind, [
1250 cat > conftest.c <<EOF
1251 int main (void) { return 0; }
1252 EOF
1253 if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
1254 conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
1255 libc_cv_cc_with_libunwind=yes
1256 else
1257 libc_cv_cc_with_libunwind=no
1258 fi
1259 rm -f conftest*])
1260 AC_SUBST(libc_cv_cc_with_libunwind)
1261 if test $libc_cv_cc_with_libunwind = yes; then
1262 AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
1263 fi
1265 ASFLAGS_config=
1266 AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
1267 libc_cv_as_noexecstack, [dnl
1268 cat > conftest.c <<EOF
1269 void foo (void) { }
1270 EOF
1271 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
1272 -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
1273 && grep .note.GNU-stack conftest.s >/dev/null \
1274 && AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
1275 -c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
1276 then
1277 libc_cv_as_noexecstack=yes
1278 else
1279 libc_cv_as_noexecstack=no
1280 fi
1281 rm -f conftest*])
1282 if test $libc_cv_as_noexecstack = yes; then
1283 ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
1284 fi
1285 AC_SUBST(ASFLAGS_config)
1287 AC_CACHE_CHECK(for -z combreloc,
1288 libc_cv_z_combreloc, [dnl
1289 cat > conftest.c <<EOF
1290 extern int bar (int);
1291 extern int mumble;
1292 int foo (void) { return bar (mumble); }
1293 EOF
1294 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1295 -fPIC -shared -o conftest.so conftest.c
1296 -nostdlib -nostartfiles
1297 -Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
1298 then
1299 dnl The following test is a bit weak. We must use a tool which can test
1300 dnl cross-platform since the gcc used can be a cross compiler. Without
1301 dnl introducing new options this is not easily doable. Instead use a tool
1302 dnl which always is cross-platform: readelf. To detect whether -z combreloc
1303 dnl look for a section named .rel.dyn.
1304 if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
1305 libc_cv_z_combreloc=yes
1306 else
1307 libc_cv_z_combreloc=no
1308 fi
1309 else
1310 libc_cv_z_combreloc=no
1311 fi
1312 rm -f conftest*])
1313 if test "$libc_cv_z_combreloc" = yes; then
1314 AC_DEFINE(HAVE_Z_COMBRELOC)
1315 fi
1316 AC_SUBST(libc_cv_z_combreloc)
1318 LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
1319 [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
1320 AC_SUBST(libc_cv_z_execstack)
1322 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
1323 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
1324 ])
1326 AC_SUBST(libc_cv_fpie)
1328 AC_CACHE_CHECK(for --hash-style option,
1329 libc_cv_hashstyle, [dnl
1330 cat > conftest.c <<EOF
1331 int _start (void) { return 42; }
1332 EOF
1333 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1334 -fPIC -shared -o conftest.so conftest.c
1335 -Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
1336 then
1337 libc_cv_hashstyle=yes
1338 else
1339 libc_cv_hashstyle=no
1340 fi
1341 rm -f conftest*])
1342 AC_SUBST(libc_cv_hashstyle)
1344 # The linker's default -shared behavior is good enough if it
1345 # does these things that our custom linker scripts ensure that
1346 # all allocated NOTE sections come first.
1347 if test "$use_default_link" = default; then
1348 AC_CACHE_CHECK([for sufficient default -shared layout],
1349 libc_cv_use_default_link, [dnl
1350 libc_cv_use_default_link=no
1351 cat > conftest.s <<\EOF
1352 .section .note.a,"a",%note
1353 .balign 4
1354 .long 4,4,9
1355 .string "GNU"
1356 .string "foo"
1357 .section .note.b,"a",%note
1358 .balign 4
1359 .long 4,4,9
1360 .string "GNU"
1361 .string "bar"
1362 EOF
1363 if AC_TRY_COMMAND([dnl
1364 ${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
1365 ac_try=`$READELF -S conftest.so | sed -n \
1366 ['${x;p;}
1367 s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
1368 t a
1369 b
1370 : a
1371 H']`
1372 then
1373 libc_seen_a=no libc_seen_b=no
1374 set -- $ac_try
1375 while test $# -ge 2 -a "$1" = NOTE; do
1376 case "$2" in
1377 .note.a) libc_seen_a=yes ;;
1378 .note.b) libc_seen_b=yes ;;
1379 esac
1380 shift 2
1381 done
1382 case "$libc_seen_a$libc_seen_b" in
1383 yesyes)
1384 libc_cv_use_default_link=yes
1385 ;;
1386 *)
1387 echo >&AS_MESSAGE_LOG_FD "\
1388 $libc_seen_a$libc_seen_b from:
1389 $ac_try"
1390 ;;
1391 esac
1392 fi
1393 rm -f conftest*])
1394 use_default_link=$libc_cv_use_default_link
1395 fi
1397 AC_CACHE_CHECK(for GLOB_DAT reloc,
1398 libc_cv_has_glob_dat, [dnl
1399 cat > conftest.c <<EOF
1400 extern int mumble;
1401 int foo (void) { return mumble; }
1402 EOF
1403 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
1404 -fPIC -shared -o conftest.so conftest.c
1405 -nostdlib -nostartfiles
1406 1>&AS_MESSAGE_LOG_FD])
1407 then
1408 dnl look for GLOB_DAT relocation.
1409 if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
1410 libc_cv_has_glob_dat=yes
1411 else
1412 libc_cv_has_glob_dat=no
1413 fi
1414 else
1415 libc_cv_has_glob_dat=no
1416 fi
1417 rm -f conftest*])
1418 AC_SUBST(libc_cv_has_glob_dat)
1420 AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
1421 if libc_cv_output_format=`
1422 ${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
1423 then
1424 :
1425 else
1426 libc_cv_output_format=
1427 fi
1428 test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
1429 AC_SUBST(libc_cv_output_format)
1431 AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
1432 cat > conftest.c <<EOF
1433 int foo;
1434 EOF
1435 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
1436 conftest.c 1>&AS_MESSAGE_LOG_FD])
1437 then
1438 libc_cv_fno_toplevel_reorder=yes
1439 else
1440 libc_cv_fno_toplevel_reorder=no
1441 fi
1442 rm -f conftest*])
1443 if test $libc_cv_fno_toplevel_reorder = yes; then
1444 fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
1445 else
1446 fno_unit_at_a_time=-fno-unit-at-a-time
1447 fi
1448 AC_SUBST(fno_unit_at_a_time)
1450 AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
1451 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
1452 [libc_cv_ssp=yes],
1453 [libc_cv_ssp=no])
1454 ])
1456 AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
1457 LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
1458 [libc_cv_ssp_strong=yes],
1459 [libc_cv_ssp_strong=no])
1460 ])
1462 stack_protector=
1463 if test "$libc_cv_ssp_strong" = "yes"; then
1464 stack_protector="-fstack-protector-strong"
1465 elif test "$libc_cv_ssp" = "yes"; then
1466 stack_protector="-fstack-protector"
1467 fi
1468 AC_SUBST(stack_protector)
1470 AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
1471 [dnl
1472 cat > conftest.c <<EOF
1473 __thread int i;
1474 void foo (void)
1475 {
1476 i = 10;
1477 }
1478 EOF
1479 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
1480 conftest.c 1>&AS_MESSAGE_LOG_FD])
1481 then
1482 libc_cv_mtls_dialect_gnu2=yes
1483 else
1484 libc_cv_mtls_dialect_gnu2=no
1485 fi
1486 rm -f conftest*])
1487 AC_SUBST(libc_cv_mtls_dialect_gnu2)
1488 LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
1490 AC_CACHE_CHECK(whether cc puts quotes around section names,
1491 libc_cv_have_section_quotes,
1492 [cat > conftest.c <<EOF
1493 static const int foo
1494 __attribute__ ((section ("bar"))) = 1;
1495 EOF
1496 if ${CC-cc} -S conftest.c -o conftest.s; then
1497 if grep '\.section.*"bar"' conftest.s >/dev/null; then
1498 libc_cv_have_section_quotes=yes
1499 else
1500 libc_cv_have_section_quotes=no
1501 fi
1502 else
1503 libc_cv_have_section_quotes=unknown
1504 fi
1505 rm -f conftest.{c,s}
1506 ])
1507 if test $libc_cv_have_section_quotes = yes; then
1508 AC_DEFINE(HAVE_SECTION_QUOTES)
1509 fi
1511 AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
1512 cat > conftest.c <<\EOF
1513 void zero (void *x)
1514 {
1515 __builtin_memset (x, 0, 1000);
1516 }
1517 EOF
1518 dnl
1519 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
1520 then
1521 libc_cv_gcc_builtin_memset=no
1522 else
1523 libc_cv_gcc_builtin_memset=yes
1524 fi
1525 rm -f conftest* ])
1526 if test "$libc_cv_gcc_builtin_memset" = yes ; then
1527 AC_DEFINE(HAVE_BUILTIN_MEMSET)
1528 fi
1530 AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
1531 cat > conftest.c <<\EOF
1532 extern char *strstr (const char *, const char *) __asm ("my_strstr");
1533 char *foo (const char *a, const char *b)
1534 {
1535 return __builtin_strstr (a, b);
1536 }
1537 EOF
1538 dnl
1539 if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
1540 then
1541 libc_cv_gcc_builtin_redirection=yes
1542 else
1543 libc_cv_gcc_builtin_redirection=no
1544 fi
1545 rm -f conftest* ])
1546 if test "$libc_cv_gcc_builtin_redirection" = no; then
1547 AC_MSG_ERROR([support for the symbol redirection needed])
1548 fi
1550 dnl Determine how to disable generation of FMA instructions.
1551 AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
1552 libc_cv_cc_nofma, [dnl
1553 libc_cv_cc_nofma=
1554 for opt in -ffp-contract=off -mno-fused-madd; do
1555 LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
1556 done])
1557 AC_SUBST(libc_cv_cc_nofma)
1559 if test -n "$submachine"; then
1560 AC_CACHE_CHECK([for compiler option for CPU variant],
1561 libc_cv_cc_submachine, [dnl
1562 libc_cv_cc_submachine=no
1563 for opt in "-march=$submachine" "-mcpu=$submachine"; do
1564 LIBC_TRY_CC_OPTION([$opt], [
1565 libc_cv_cc_submachine="$opt"
1566 break], [])
1567 done])
1568 if test "x$libc_cv_cc_submachine" = xno; then
1569 AC_MSG_ERROR([${CC-cc} does not support $submachine])
1570 fi
1571 fi
1572 AC_SUBST(libc_cv_cc_submachine)
1574 AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
1575 __attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
1576 cat > conftest.c <<EOF
1577 void
1578 __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
1579 foo (void) {}
1580 EOF
1581 libc_cv_cc_loop_to_function=no
1582 if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
1583 then
1584 libc_cv_cc_loop_to_function=yes
1585 fi
1586 rm -f conftest*])
1587 if test $libc_cv_cc_loop_to_function = yes; then
1588 AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
1589 fi
1590 AC_SUBST(libc_cv_cc_loop_to_function)
1592 dnl Check whether we have the gd library available.
1593 AC_MSG_CHECKING(for libgd)
1594 if test "$with_gd" != "no"; then
1595 old_CFLAGS="$CFLAGS"
1596 CFLAGS="$CFLAGS $libgd_include"
1597 old_LDFLAGS="$LDFLAGS"
1598 LDFLAGS="$LDFLAGS $libgd_ldflags"
1599 old_LIBS="$LIBS"
1600 LIBS="$LIBS -lgd -lpng -lz -lm"
1601 AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
1602 CFLAGS="$old_CFLAGS"
1603 LDFLAGS="$old_LDFLAGS"
1604 LIBS="$old_LIBS"
1605 else
1606 LIBGD=no
1607 fi
1608 AC_MSG_RESULT($LIBGD)
1609 AC_SUBST(LIBGD)
1611 # SELinux detection
1612 if test x$with_selinux = xno ; then
1613 have_selinux=no;
1614 else
1615 # See if we have the SELinux library
1616 AC_CHECK_LIB(selinux, is_selinux_enabled,
1617 have_selinux=yes, have_selinux=no)
1618 if test x$with_selinux = xyes ; then
1619 if test x$have_selinux = xno ; then
1620 AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
1621 fi
1622 fi
1623 fi
1624 # Check if we're building with SELinux support.
1625 if test "x$have_selinux" = xyes; then
1626 AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
1628 # See if we have the libaudit library
1629 AC_CHECK_LIB(audit, audit_log_user_avc_message,
1630 have_libaudit=yes, have_libaudit=no)
1631 if test "x$have_libaudit" = xyes; then
1632 AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
1633 fi
1634 AC_SUBST(have_libaudit)
1636 # See if we have the libcap library
1637 AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
1638 if test "x$have_libcap" = xyes; then
1639 AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
1640 fi
1641 AC_SUBST(have_libcap)
1642 fi
1643 AC_SUBST(have_selinux)
1645 CPPUNDEFS=
1646 dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
1647 dnl Since we are building the implementations of the fortified functions here,
1648 dnl having the macro defined interacts very badly.
1649 AC_CACHE_CHECK([for _FORTIFY_SOURCE predefine], libc_cv_predef_fortify_source,
1650 [AC_TRY_COMPILE([], [
1651 #ifdef _FORTIFY_SOURCE
1652 # error bogon
1653 #endif],
1654 [libc_cv_predef_fortify_source=no],
1655 [libc_cv_predef_fortify_source=yes])])
1656 if test $libc_cv_predef_fortify_source = yes; then
1657 CPPUNDEFS="${CPPUNDEFS:+$CPPUNDEFS }-U_FORTIFY_SOURCE"
1658 fi
1659 AC_SUBST(CPPUNDEFS)
1661 dnl Check for silly hacked compilers inserting -fstack-protector.
1662 dnl This breaks badly for the early startup code we compile, since
1663 dnl the compiled code can refer to a magic machine-dependent location
1664 dnl for the canary value before we have sufficient setup for that to
1665 dnl work. It's also questionable to build all of libc with this flag
1666 dnl even when you're doing that for most applications you build, since
1667 dnl libc's code is so heavily-used and performance-sensitive. If we
1668 dnl ever really want to make that work, it should be enabled explicitly
1669 dnl in the libc build, not inherited from implicit compiler settings.
1670 AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
1671 libc_cv_predef_stack_protector, [
1672 AC_TRY_COMPILE([extern void foobar (char *);],
1673 [char large_array[2048]; foobar (large_array);], [
1674 libc_undefs=`$NM -u conftest.o |
1675 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1676 2>&AS_MESSAGE_LOG_FD` || {
1677 AC_MSG_ERROR([confusing output from $NM -u])
1678 }
1679 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1680 # On some architectures, there are architecture-specific undefined
1681 # symbols (resolved by the linker), so filter out unknown symbols.
1682 # This will fail to produce the correct result if the compiler
1683 # defaults to -fstack-protector but this produces an undefined symbol
1684 # other than __stack_chk_fail or __stack_chk_fail_local. However,
1685 # compilers like that have not been encountered in practice.
1686 libc_undefs=`echo "$libc_undefs" | \
1687 egrep '^(foobar|__stack_chk_fail|__stack_chk_fail_local)$'`
1688 case "$libc_undefs" in
1689 foobar) libc_cv_predef_stack_protector=no ;;
1690 '__stack_chk_fail
1691 foobar'|'__stack_chk_fail_local
1692 foobar') libc_cv_predef_stack_protector=yes ;;
1693 *) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
1694 esac],
1695 [AC_MSG_ERROR([test compilation failed])])
1696 ])
1697 libc_extra_cflags=
1698 if test $libc_cv_predef_stack_protector = yes; then
1699 libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
1700 fi
1701 libc_extra_cppflags=
1703 # Some linkers on some architectures support __ehdr_start but with
1704 # bugs. Make sure usage of it does not create relocations in the
1705 # output (as the linker should resolve them all for us).
1706 AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
1707 libc_cv_ehdr_start, [
1708 old_CFLAGS="$CFLAGS"
1709 old_LDFLAGS="$LDFLAGS"
1710 old_LIBS="$LIBS"
1711 CFLAGS="$CFLAGS -fPIC"
1712 LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
1713 LIBS=
1714 AC_LINK_IFELSE([AC_LANG_SOURCE([
1715 typedef struct {
1716 char foo;
1717 long val;
1718 } Ehdr;
1719 extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
1720 long ehdr (void) { return __ehdr_start.val; }
1721 ])],
1722 [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
1723 libc_cv_ehdr_start=broken
1724 else
1725 libc_cv_ehdr_start=yes
1726 fi], [libc_cv_ehdr_start=no])
1727 CFLAGS="$old_CFLAGS"
1728 LDFLAGS="$old_LDFLAGS"
1729 LIBS="$old_LIBS"
1730 ])
1731 if test "$libc_cv_ehdr_start" = yes; then
1732 AC_DEFINE([HAVE_EHDR_START])
1733 elif test "$libc_cv_ehdr_start" = broken; then
1734 AC_MSG_WARN([linker is broken -- you should upgrade])
1735 fi
1737 AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
1738 libc_cv_builtin_trap, [dnl
1739 libc_cv_builtin_trap=no
1740 AC_TRY_COMPILE([], [__builtin_trap ()], [
1741 libc_undefs=`$NM -u conftest.o |
1742 LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
1743 2>&AS_MESSAGE_LOG_FD` || {
1744 AC_MSG_ERROR([confusing output from $NM -u])
1745 }
1746 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
1747 if test -z "$libc_undefs"; then
1748 libc_cv_builtin_trap=yes
1749 fi])])
1750 if test $libc_cv_builtin_trap = yes; then
1751 AC_DEFINE([HAVE_BUILTIN_TRAP])
1752 fi
1754 dnl C++ feature tests.
1755 AC_LANG_PUSH([C++])
1757 AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
1758 libc_cv_cxx_thread_local, [
1759 old_CXXFLAGS="$CXXFLAGS"
1760 CXXFLAGS="$CXXFLAGS -std=gnu++11"
1761 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
1762 #include <thread>
1764 // Compiler support.
1765 struct S
1766 {
1767 S ();
1768 ~S ();
1769 };
1770 thread_local S s;
1771 S * get () { return &s; }
1773 // libstdc++ support.
1774 #ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
1775 #error __cxa_thread_atexit_impl not supported
1776 #endif
1777 ])],
1778 [libc_cv_cxx_thread_local=yes],
1779 [libc_cv_cxx_thread_local=no])
1780 CXXFLAGS="$old_CXXFLAGS"
1781 ])
1782 AC_SUBST(libc_cv_cxx_thread_local)
1784 AC_LANG_POP([C++])
1785 dnl End of C++ feature tests.
1787 ### End of automated tests.
1788 ### Now run sysdeps configure fragments.
1790 # They also can set these variables.
1791 use_ldconfig=no
1792 ldd_rewrite_script=no
1793 libc_cv_sysconfdir=$sysconfdir
1794 libc_cv_localstatedir=$localstatedir
1795 libc_cv_gcc_unwind_find_fde=no
1796 libc_cv_idn=no
1798 # Iterate over all the sysdep directories we will use, running their
1799 # configure fragments.
1800 for dir in $sysnames; do
1801 case $dir in
1802 /*) dest=$dir ;;
1803 *) dest=$srcdir/$dir ;;
1804 esac
1805 if test -r $dest/configure; then
1806 AC_MSG_RESULT(running configure fragment for $dir)
1807 . $dest/configure
1808 fi
1809 done
1811 if test x"$build_mathvec" = xnotset; then
1812 build_mathvec=no
1813 fi
1814 LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
1816 AC_SUBST(libc_extra_cflags)
1817 AC_SUBST(libc_extra_cppflags)
1819 if test x$libc_cv_gcc_unwind_find_fde = xyes; then
1820 AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
1821 fi
1822 AC_SUBST(libc_cv_gcc_unwind_find_fde)
1824 # A sysdeps configure fragment can reset this if IFUNC is not actually
1825 # usable even though the assembler knows how to generate the symbol type.
1826 if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
1827 AC_DEFINE(HAVE_IFUNC)
1828 fi
1830 if test x"$libc_cv_gcc_indirect_function" = xyes; then
1831 AC_DEFINE(HAVE_GCC_IFUNC)
1832 fi
1834 # This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
1835 # configure fragment can override the value to prevent this AC_DEFINE.
1836 AC_SUBST(use_nscd)
1837 if test "x$use_nscd" != xno; then
1838 AC_DEFINE([USE_NSCD])
1839 fi
1840 if test "x$build_nscd" = xdefault; then
1841 build_nscd=$use_nscd
1842 fi
1844 AC_SUBST(libc_cv_slibdir)
1845 AC_SUBST(libc_cv_rtlddir)
1846 AC_SUBST(libc_cv_complocaledir)
1847 AC_SUBST(libc_cv_sysconfdir)
1848 AC_SUBST(libc_cv_localstatedir)
1849 AC_SUBST(libc_cv_rootsbindir)
1851 if test x$use_ldconfig = xyes; then
1852 AC_DEFINE(USE_LDCONFIG)
1853 fi
1854 AC_SUBST(use_ldconfig)
1855 AC_SUBST(ldd_rewrite_script)
1857 AC_SUBST(static)
1858 AC_SUBST(shared)
1860 AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
1861 [libc_cv_pic_default=yes
1862 cat > conftest.c <<EOF
1863 #if defined __PIC__ || defined __pic__ || defined PIC || defined pic
1864 # error PIC is default.
1865 #endif
1866 EOF
1867 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1868 libc_cv_pic_default=no
1869 fi
1870 rm -f conftest.*])
1871 AC_SUBST(libc_cv_pic_default)
1873 AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
1874 [libc_cv_pie_default=yes
1875 cat > conftest.c <<EOF
1876 #if defined __PIE__ || defined __pie__ || defined PIE || defined pie
1877 # error PIE is default.
1878 #endif
1879 EOF
1880 if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
1881 libc_cv_pie_default=no
1882 fi
1883 rm -f conftest.*])
1884 AC_SUBST(libc_cv_pie_default)
1886 AC_SUBST(profile)
1887 AC_SUBST(static_nss)
1889 AC_SUBST(DEFINES)
1891 dnl See sysdeps/mach/configure.ac for this variable.
1892 AC_SUBST(mach_interface_list)
1894 VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
1895 RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
1896 AC_SUBST(VERSION)
1897 AC_SUBST(RELEASE)
1899 AC_CONFIG_FILES([config.make Makefile])
1900 AC_CONFIG_COMMANDS([default],[[
1901 case $CONFIG_FILES in *config.make*)
1902 echo "$config_vars" >> config.make;;
1903 esac
1904 test -d bits || mkdir bits]],[[config_vars='$config_vars']])
1905 AC_OUTPUT