1 dnl Process this file with autoconf to produce a configure script.
3 dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
5 dnl This file is free software; you can redistribute it and/or modify
6 dnl it under the terms of the GNU General Public License as published by
7 dnl the Free Software Foundation; either version 3 of the License, or
8 dnl (at your option) any later version.
10 dnl This program is distributed in the hope that it will be useful,
11 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
12 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 dnl GNU General Public License for more details.
15 dnl You should have received a copy of the GNU General Public License
16 dnl along with this program; see the file COPYING3. If not see
17 dnl <http://www.gnu.org/licenses/>.
21 AC_CONFIG_SRCDIR(gold.cc)
25 AM_INIT_AUTOMAKE([no-dist parallel-tests])
27 AM_CONFIG_HEADER(config.h:config.in)
29 AC_USE_SYSTEM_EXTENSIONS
32 AH_VERBATIM([00_CONFIG_H_CHECK],
33 [/* Check that config.h is #included before system headers
34 (this works only for glibc, but that should be enough). */
35 #if defined(__GLIBC__) && !defined(__FreeBSD_kernel__) && !defined(__CONFIG_H__)
36 # error config.h must be #included before system headers
38 #define __CONFIG_H__ 1])
41 [ --with-sysroot[=DIR] search for usr/lib et al within DIR],
42 [sysroot=$withval], [sysroot=no])
44 if test "$sysroot" = "yes"; then
45 sysroot='${exec_prefix}/${target_alias}/sys-root'
46 elif test "$sysroot" = "no"; then
51 if test -n "$sysroot"; then
53 "${prefix}" | "${prefix}/"* | \
54 "${exec_prefix}" | "${exec_prefix}/"* | \
55 '${prefix}' | '${prefix}/'*| \
56 '${exec_prefix}' | '${exec_prefix}/'*)
62 AC_DEFINE_UNQUOTED(TARGET_SYSTEM_ROOT, "$sysroot",
63 [System root for target files])
64 AC_DEFINE_UNQUOTED(TARGET_SYSTEM_ROOT_RELOCATABLE, $sysroot_relocatable,
65 [Whether the system root can be relocated])
67 dnl "install_as_default" is true if the linker to be installed as the
68 dnl default linker, ld.
69 dnl "installed_linker" is the installed gold linker name.
71 installed_linker=ld.gold
73 [[ --enable-gold[=ARG] build gold [ARG={default,yes,no}]]],
74 [case "${enableval}" in
76 install_as_default=yes
79 if test x${enable_ld} = xno; then
80 install_as_default=yes
84 [install_as_default=no])
85 AC_SUBST(install_as_default)
86 AC_SUBST(installed_linker)
89 if test "$plugins" = "yes"; then
90 AC_DEFINE(ENABLE_PLUGINS, 1,
91 [Define to enable linker plugins])
93 AM_CONDITIONAL(PLUGINS, test "$plugins" = "yes")
95 # Decide if -z relro should be enabled in ELF linker by default.
96 ac_default_ld_z_relro=unset
97 # Provide a configure time option to override our default.
99 AS_HELP_STRING([--enable-relro],
100 [enable -z relro in ELF linker by default]),
101 [case "${enableval}" in
102 yes) ac_default_ld_z_relro=1 ;;
103 no) ac_default_ld_z_relro=0 ;;
105 if test "${ac_default_ld_z_relro}" = unset; then
106 ac_default_ld_z_relro=1
108 AC_DEFINE_UNQUOTED(DEFAULT_LD_Z_RELRO,
109 $ac_default_ld_z_relro,
110 [Define to 1 if you want to enable -z relro in ELF linker by default.])
112 AC_ARG_ENABLE([targets],
113 [ --enable-targets alternative target configurations],
114 [case "${enableval}" in
116 AC_MSG_ERROR([--enable-targets option must specify target names or 'all'])
122 enable_targets=$enableval
125 [# For now, enable all targets by default
129 # Canonicalize the enabled targets.
130 if test -n "$enable_targets"; then
131 for targ in `echo $enable_targets | sed -e 's/,/ /g'`; do
132 result=`$ac_config_sub $targ 2>/dev/null`
133 if test -n "$result"; then
134 canon_targets="$canon_targets $result"
136 # Permit unrecognized target names, like "all".
137 canon_targets="$canon_targets $targ"
142 # Decide which "--hash-style" to use by default
143 # Provide a configure time option to override our default.
144 AC_ARG_ENABLE([default-hash-style],
145 AS_HELP_STRING([--enable-default-hash-style={sysv,gnu,both}],
146 [use this default hash style]),
147 [case "${enable_default_hash_style}" in
148 sysv | gnu | both) ;;
149 *) AC_MSG_ERROR([bad value ${enable_default_hash_style} for enable-default-hash-style option]) ;;
152 # Enable gnu hash only on GNU targets, but not mips
153 mips*-*-*) enable_default_hash_style=sysv ;;
154 *-*-gnu* | *-*-linux* | *-*-nacl*) enable_default_hash_style=both ;;
155 *) enable_default_hash_style=sysv ;;
158 AC_DEFINE_UNQUOTED([DEFAULT_HASH_STYLE],
159 ["${enable_default_hash_style}"],
160 [Set the default --hash-style value])
162 # See which specific instantiations we need.
168 default_osabi=ELFOSABI_NONE
173 for targ in $target $canon_targets; do
174 if test "$targ" = "all"; then
181 . ${srcdir}/configure.tgt
183 if test "$targ_obj" = "UNKNOWN"; then
184 AC_MSG_ERROR("unsupported target $targ")
186 targetobjs="$targetobjs ${targ_obj}.\$(OBJEXT)"
187 if test "$targ_extra_obj" != ""; then
188 targetobjs="$targetobjs ${targ_extra_obj}.\$(OBJEXT)"
190 if test "$targ_size" = "32" -o "$targ_extra_size" = "32"; then
191 if test "$targ_big_endian" = "true" \
192 -o "$targ_extra_big_endian" = "true"; then
195 if test "$targ_big_endian" = "false" \
196 -o "$targ_extra_big_endian" = "false"; then
200 if test "$targ_size" = "64" -o "$targ_extra_size" = "64"; then
201 if test "$targ_big_endian" = "true" \
202 -o "$targ_extra_big_endian" = "true"; then
205 if test "$targ_big_endian" = "false" \
206 -o "$targ_extra_big_endian" = "false"; then
211 if test "$target" = "$targ"; then
212 default_machine=$targ_machine
213 default_size=$targ_size
214 default_big_endian=$targ_big_endian
215 default_osabi=$targ_osabi
217 AM_CONDITIONAL(DEFAULT_TARGET_AARCH64, test "$targ_obj" = "aarch64")
218 AM_CONDITIONAL(DEFAULT_TARGET_ARM, test "$targ_obj" = "arm")
219 AM_CONDITIONAL(DEFAULT_TARGET_I386, test "$targ_obj" = "i386")
220 AM_CONDITIONAL(DEFAULT_TARGET_POWERPC, test "$targ_obj" = "powerpc")
221 AM_CONDITIONAL(DEFAULT_TARGET_SPARC, test "$targ_obj" = "sparc")
222 AM_CONDITIONAL(DEFAULT_TARGET_S390, test "$targ_obj" = "s390")
225 if test "$targ_obj" = "x86_64"; then
227 x86_64*-linux-gnux32)
236 AM_CONDITIONAL(DEFAULT_TARGET_X86_64, test "$target_x86_64" = "yes")
237 AM_CONDITIONAL(DEFAULT_TARGET_X32, test "$target_x32" = "yes")
238 AM_CONDITIONAL(DEFAULT_TARGET_X86_64_OR_X32,
239 test "$target_x86_64" = "yes" -o "$target_x32" = "yes")
240 AM_CONDITIONAL(DEFAULT_TARGET_TILEGX, test "$targ_obj" = "tilegx")
241 AM_CONDITIONAL(DEFAULT_TARGET_MIPS, test "$targ_obj" = "mips")
242 DEFAULT_TARGET=${targ_obj}
243 AC_SUBST(DEFAULT_TARGET)
249 # Remove any duplicates.
251 for t in $targetobjs; do
259 if test -n "$targ_32_little"; then
260 AC_DEFINE(HAVE_TARGET_32_LITTLE, 1,
261 [Define to support 32-bit little-endian targets])
263 if test -n "$targ_32_big"; then
264 AC_DEFINE(HAVE_TARGET_32_BIG, 1,
265 [Define to support 32-bit big-endian targets])
267 if test -n "$targ_64_little"; then
268 AC_DEFINE(HAVE_TARGET_64_LITTLE, 1,
269 [Define to support 64-bit little-endian targets])
271 if test -n "$targ_64_big"; then
272 AC_DEFINE(HAVE_TARGET_64_BIG, 1,
273 [Define to support 64-bit big-endian targets])
276 if test -n "$all_targets"; then
277 TARGETOBJS='$(ALL_TARGETOBJS)'
279 TARGETOBJS="$targetobjs"
283 AC_DEFINE_UNQUOTED(GOLD_DEFAULT_MACHINE, $default_machine,
284 [Default machine code])
285 AC_DEFINE_UNQUOTED(GOLD_DEFAULT_SIZE, $default_size,
286 [Default size (32 or 64)])
287 AC_DEFINE_UNQUOTED(GOLD_DEFAULT_BIG_ENDIAN, $default_big_endian,
288 [Default big endian (true or false)])
289 AC_DEFINE_UNQUOTED(GOLD_DEFAULT_OSABI, $default_osabi,
290 [Default OSABI code])
292 AC_ARG_WITH(lib-path,
293 [ --with-lib-path=dir1:dir2... set default LIB_PATH],
295 yes) LIB_PATH='"/lib:/usr/lib"' ;;
297 *) LIB_PATH='"'"$withval"'"' ;;
299 [LIB_PATH='"::DEFAULT::"'])
300 AC_DEFINE_UNQUOTED(LIB_PATH, $LIB_PATH,
301 [Default library search path])
302 if test "x$target_alias" = "x" -o "x$host_alias" = "x$target_alias"; then
303 AC_DEFINE(NATIVE_LINKER, 1, [Whether configured as a native linker])
306 AC_CHECK_TOOL(NM, nm)
317 ZW_GNU_GETTEXT_SISTER_DIR
324 AM_CONDITIONAL(NATIVE_LINKER,
325 test "x$target_alias" = "x" -o "x$host_alias" = "x$target_alias")
326 AM_CONDITIONAL(GCC, test "$GCC" = yes)
328 AM_CONDITIONAL(NATIVE_OR_CROSS_LINKER,
329 test "x$target_alias" = "x" -o "x$host_alias" = "x$target_alias" -o "x$host_alias" = "x$build_alias")
331 dnl Test for whether static linking is supported. Some systems do not
332 dnl install static libraries. This only affects the set of tests that
334 AC_CACHE_CHECK([whether static linking works], [gold_cv_lib_static],
335 [LDFLAGS_hold=$LDFLAGS
336 LDFLAGS="$LDFLAGS -static"
338 AC_LANG_PROGRAM([[void f() { }]])],
339 [gold_cv_lib_static=yes], [gold_cv_lib_static=no])
340 LDFLAGS=$LDFLAGS_hold])
341 AM_CONDITIONAL(HAVE_STATIC, test "$gold_cv_lib_static" = "yes")
343 dnl Some architectures do not support taking pointers of functions
344 dnl defined in shared libraries except in -fPIC mode. We need to
345 dnl tell the unittest framework if we're compiling for one of those
346 dnl targets, so it doesn't try to run the tests that do that.
347 AM_CONDITIONAL(FN_PTRS_IN_SO_WITHOUT_PIC, [
356 dnl Test for gcc 4.1 or later. Full support for -mcmodel=medium is
357 dnl only available in gcc 4.1.
358 AC_CACHE_CHECK([for gcc >= 4.1], [gold_cv_prog_gcc41],
359 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
360 #if !defined __GNUC__
362 #elif __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 1)
365 ])], [gold_cv_prog_gcc41=yes], [gold_cv_prog_gcc41=no])])
367 save_CFLAGS="$CFLAGS"
368 CFLAGS="$CFLAGS -mcmodel=medium"
369 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])], [have_mcmodel_medium=yes], [have_mcmodel_medium=no])
370 CFLAGS="$save_CFLAGS"
371 dnl Whether we can test -mcmodel=medium.
372 AM_CONDITIONAL(MCMODEL_MEDIUM,
373 [test "$target_cpu" = "x86_64" -a "$have_mcmodel_medium" = "yes" -a "$gold_cv_prog_gcc41" = "yes"])
375 dnl Test for gcc 9 or later. Some incremental tests fail with GCC 9 or
377 AC_CACHE_CHECK([for gcc >= 9], [gold_cv_prog_gcc9],
378 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
379 #if !defined __GNUC__ || __GNUC__ < 9
382 ])], [gold_cv_prog_gcc9=yes], [gold_cv_prog_gcc9=no])])
383 AM_CONDITIONAL(GCC9, [test "$gold_cv_prog_gcc9" = "yes"])
385 dnl Test for -fcf-protection on x86-64. Some incremental tests fail with
387 AC_CACHE_CHECK([for -fcf-protection], [gold_cv_cflags_cf_protection],
388 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
389 #if !defined __x86_64__ || !defined __CET__
392 ])], [gold_cv_cflags_cf_protection=yes], [gold_cv_cflags_cf_protection=no])])
393 AM_CONDITIONAL(CFLAGS_CF_PROTECTION, [test "$gold_cv_cflags_cf_protection" = "yes"])
395 AC_CACHE_CHECK([whether $CC supports -fmerge-constants],
396 [gold_cv_merge_constants], [
397 save_CFLAGS="$CFLAGS"
398 CFLAGS="$CFLAGS -fmerge-constants"
399 AC_COMPILE_IFELSE([AC_LANG_SOURCE([const char *s = "foo";])],
400 [gold_cv_merge_constants=yes],
401 [gold_cv_merge_constants=no])
402 CFLAGS="$save_CFLAGS"])
403 AC_SUBST([MERGE_CONSTANTS_FLAG])
404 AS_IF([test "$gold_cv_merge_constants" = yes],
405 [MERGE_CONSTANTS_FLAG=-fmerge-constants],
406 [MERGE_CONSTANTS_FLAG=])
408 dnl Test for __thread support.
409 AC_CACHE_CHECK([for thread support], [gold_cv_c_thread],
410 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([__thread int i = 1;])],
411 [gold_cv_c_thread=yes], [gold_cv_c_thread=no])])
413 AM_CONDITIONAL(TLS, test "$gold_cv_c_thread" = "yes")
415 dnl On GNU/Linux TLS in static programs only works when using glibc
417 AC_CACHE_CHECK([for glibc >= 2.4], [gold_cv_lib_glibc24],
418 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
419 #include <features.h>
420 #if !defined __GLIBC__
422 #elif __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 4)
425 ])], [gold_cv_lib_glibc24=yes], [gold_cv_lib_glibc24=no])])
427 AM_CONDITIONAL(STATIC_TLS, test "$gold_cv_lib_glibc24" = "yes")
429 dnl Test for #pragma omp threadprivate
430 AC_CACHE_CHECK([for omp support], [gold_cv_c_threadprivate],
431 [save_CFLAGS="$CFLAGS"
432 CFLAGS="$CFLAGS -fopenmp"
433 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
436 #pragma omp threadprivate (i)
437 ])], [gold_cv_c_threadprivate=yes], [gold_cv_c_threadprivate=no])
438 CFLAGS="$save_CFLAGS"])
439 if test "$gold_cv_c_threadprivate" = "yes"; then
440 AC_DEFINE(HAVE_OMP_SUPPORT, 1,
441 [Define if compiler supports #pragma omp threadprivate])
443 AM_CONDITIONAL(OMP_SUPPORT, test "$gold_cv_c_threadprivate" = "yes")
445 dnl Test for the -ftls-dialect=gnu2 option.
446 dnl Use -Werror in case of compilers that make unknown -m options warnings.
447 dnl They would pass the test here, but fail in actual use when $WARN_CFLAGS
448 dnl gets set later by default Autoconf magic to include -Werror. (We are
449 dnl assuming here that there is no compiler that groks -mtls-dialect=gnu2
450 dnl but does not grok -Werror.)
451 save_CFLAGS="$CFLAGS"
452 CFLAGS="$CFLAGS -Werror -fpic -mtls-dialect=gnu2"
453 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
459 ])], [have_tls_gnu2=yes], [have_tls_gnu2=no])
460 CFLAGS="$save_CFLAGS"
461 AM_CONDITIONAL(TLS_GNU2_DIALECT, test "$have_tls_gnu2" = "yes")
463 dnl On GNU/Linux TLS descriptors are supported by the dynamic loader
464 dnl only with glibc 2.9 or later.
465 AC_CACHE_CHECK([for glibc >= 2.9], [gold_cv_lib_glibc29],
466 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
467 #include <features.h>
468 #if !defined __GLIBC__
470 #elif __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 9)
473 ])], [gold_cv_lib_glibc29=yes], [gold_cv_lib_glibc29=no])])
475 AM_CONDITIONAL(TLS_DESCRIPTORS, test "$gold_cv_lib_glibc29" = "yes")
477 dnl Test for the -frandom-seed option.
478 AC_CACHE_CHECK([for -frandom-seed support], [gold_cv_c_random_seed],
479 [save_CFLAGS="$CFLAGS"
480 CFLAGS="$CFLAGS -frandom-seed=foo"
481 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])], [gold_cv_c_random_seed=yes],
482 [gold_cv_c_random_seed=no])
483 CFLAGS="$save_CFLAGS"])
484 if test "$gold_cv_c_random_seed" = "yes"; then
485 # In Makefile, '$@' will be expanded to be the name of the file
486 # being built, providing a unique seed for each file.
487 RANDOM_SEED_CFLAGS=-frandom-seed=\$@
489 AC_SUBST(RANDOM_SEED_CFLAGS)
491 dnl On GNU/Linux ifunc is supported by the dynamic linker in glibc
492 dnl 2.11 or later, and by binutils 2.20.1 or later.
493 AC_CACHE_CHECK([for glibc ifunc support], [gold_cv_lib_glibc_ifunc],
494 [save_LDFLAGS="$LDFLAGS"
495 LDFLAGS="$LDFLAGS -static"
496 AC_LINK_IFELSE([AC_LANG_PROGRAM([[
497 #include <features.h>
498 #if !defined __GLIBC__
500 #elif __GLIBC__ < 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ < 11)
505 __asm__(".type invoke, %gnu_indirect_function");
506 typedef void (*funcptr) (void);
507 funcptr dispatch (void) __asm__ ("invoke");
508 funcptr dispatch (void) { return &func; }]],
511 if ${NM} conftest$EXEEXT | grep "__rela\?_iplt_start" >/dev/null 2>&1; then
512 gold_cv_lib_glibc_ifunc=both
514 gold_cv_lib_glibc_ifunc=dyn
515 fi], [gold_cv_lib_glibc_ifunc=no])
516 LDFLAGS="$save_LDFLAGS"])
518 AM_CONDITIONAL(IFUNC, test "$gold_cv_lib_glibc_ifunc" != "no")
519 AM_CONDITIONAL(IFUNC_STATIC, test "$gold_cv_lib_glibc_ifunc" = "both")
523 WARN_CXXFLAGS=`echo ${WARN_CFLAGS} | sed -e 's/-Wstrict-prototypes//' -e 's/-Wmissing-prototypes//' -e 's/-Wshadow//'`
524 AC_SUBST(WARN_CXXFLAGS)
526 AC_ARG_WITH(gold-ldflags,
527 [ --with-gold-ldflags=FLAGS additional link flags for gold],
528 [if test "$withval" = "no" -o "$withval" = "yes"; then
531 GOLD_LDFLAGS=$withval
534 AC_SUBST(GOLD_LDFLAGS)
536 AC_ARG_WITH(gold-ldadd,
537 [ --with-gold-ldadd=LIBS additional libraries for gold],
538 [if test "$withval" = "no" -o "$withval" = "yes"; then
546 dnl Force support for large files by default. This may need to be
547 dnl host dependent. If build == host, we can check getconf LFS_CFLAGS.
548 LFS_CFLAGS="-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
551 AC_CHECK_HEADERS(sys/mman.h)
552 AC_CHECK_FUNCS(chsize mmap link)
553 AC_REPLACE_FUNCS(pread ftruncate ffsll)
555 AC_CACHE_CHECK([mremap with MREMAP_MAYMOVE], [gold_cv_lib_mremap_maymove],
558 #include <sys/mman.h>
559 void f() { mremap (0, 0, 0, MREMAP_MAYMOVE); }
560 ]])], [gold_cv_lib_mremap_maymove=yes], [gold_cv_lib_mremap_maymove=no])])
561 if test "$gold_cv_lib_mremap_maymove" = "yes"; then
562 AC_DEFINE(HAVE_MREMAP, 1,
563 [Define to 1 if you have the mremap function with MREMAP_MAYMOVE support])
568 # Link in zlib if we can. This allows us to write compressed sections.
571 AC_ARG_ENABLE([threads],
572 [[ --enable-threads[=ARG] multi-threaded linking [ARG={auto,yes,no}]]],
573 [case "${enableval}" in
574 yes | "") threads=yes ;;
576 auto) threads=auto ;;
581 if test "$threads" = "yes"; then
582 AX_PTHREAD([threads=yes], AC_MSG_ERROR([pthread not found]))
583 elif test "$threads" = "auto"; then
584 AX_PTHREAD([threads=yes], [threads=no])
587 if test "$threads" = "yes"; then
588 AC_DEFINE(ENABLE_THREADS, 1,
589 [Define to do multi-threaded linking])
591 AM_CONDITIONAL(THREADS, test "$threads" = "yes")
593 dnl We have to check these in C, not C++, because autoconf generates
594 dnl tests which have no type information, and current glibc provides
595 dnl multiple declarations of functions like basename when compiling
597 AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp])
599 dnl Check if gcc supports the -gpubnames option.
600 dnl Use -Werror in case of compilers that make unknown -g options warnings.
601 dnl They would pass the test here, but fail in actual use when $WARN_CFLAGS
602 dnl gets set later by default Autoconf magic to include -Werror. (We are
603 dnl assuming here that there is no compiler that groks -gpubnames
604 dnl but does not grok -Werror.)
605 save_CFLAGS="$CFLAGS"
606 CFLAGS="$CFLAGS -Werror -gpubnames"
607 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])], [have_pubnames=yes], [have_pubnames=no])
608 CFLAGS="$save_CFLAGS"
609 AM_CONDITIONAL(HAVE_PUBNAMES, test "$have_pubnames" = "yes")
611 dnl Check if gcc supports the -fno-use-linker-plugin option.
612 save_CFLAGS="$CFLAGS"
613 CFLAGS="$CFLAGS -Werror -fno-use-linker-plugin"
614 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])], [have_no_use_linker_plugin=yes], [have_no_use_linker_plugin=no])
615 CFLAGS="$save_CFLAGS"
616 AM_CONDITIONAL(HAVE_NO_USE_LINKER_PLUGIN, test "$have_no_use_linker_plugin" = "yes")
620 AC_CHECK_HEADERS(unordered_set unordered_map)
621 AC_CHECK_HEADERS(tr1/unordered_set tr1/unordered_map)
622 AC_CHECK_HEADERS(ext/hash_map ext/hash_set)
623 AC_CHECK_HEADERS(byteswap.h)
625 dnl Check for bswap_{16,32,64}
626 AC_CHECK_DECLS([bswap_16, bswap_32, bswap_64], [], [], [[#include <byteswap.h>]])
628 dnl When plugins enabled dynamic loader interface is required. Check headers
629 dnl which may provide this interface. Add the necessary library to link.
630 AC_CHECK_HEADERS(windows.h)
631 AC_CHECK_HEADERS(dlfcn.h)
632 AC_SEARCH_LIBS(dlopen, [dl dld])
633 case "$ac_cv_search_dlopen" in
634 no*) DLOPEN_LIBS="";;
635 *) DLOPEN_LIBS="$ac_cv_search_dlopen";;
637 AC_SUBST(DLOPEN_LIBS)
639 AC_CHECK_FUNCS(mallinfo posix_fallocate fallocate readv sysconf times mkdtemp)
640 AC_CHECK_DECLS([basename, ffs, asprintf, vasprintf, snprintf, vsnprintf, strverscmp, strndup, memmem])
642 # Use of ::std::tr1::unordered_map::rehash causes undefined symbols
643 # at link time with some versions of GCC.
644 AC_CACHE_CHECK([whether ::std::tr1::unordered_map::rehash is usable.],
645 [gold_cv_unordered_map_rehash],
646 [AC_LINK_IFELSE([AC_LANG_PROGRAM([[
647 #include <tr1/unordered_map>
648 void bar() { ::std::tr1::unordered_map<int, int> x; x.rehash(10); }
649 ]])], [gold_cv_unordered_map_rehash=yes], [gold_cv_unordered_map_rehash=no])])
650 if test "$gold_cv_unordered_map_rehash" = "yes"; then
651 AC_DEFINE(HAVE_TR1_UNORDERED_MAP_REHASH, 1,
652 [Define if ::std::tr1::unordered_map::rehash is usable])
655 # Use of tr1/unordered_map with off_t as a key is not supported on GCC
656 # 4.1.xx when compiling in 32-bit mode with a 64-bit off_t type.
657 AC_CACHE_CHECK([whether std::tr1::hash<off_t> is defined],
658 [gold_cv_hash_off_t],
659 [CXXFLAGS_hold=$CXXFLAGS
660 CXXFLAGS="$CXXFLAGS $LFS_CFLAGS"
661 AC_COMPILE_IFELSE([AC_LANG_SOURCE([
662 #include <sys/types.h>
663 #include <tr1/unordered_map>
664 std::tr1::hash<off_t> h;
666 [gold_cv_hash_off_t=yes],
667 [gold_cv_hash_off_t=no])
668 CXXFLAGS=$CXXFLAGS_hold])
669 if test "$gold_cv_hash_off_t" = "yes"; then
670 AC_DEFINE(HAVE_TR1_HASH_OFF_T, 1,
671 [Define if std::tr1::hash<off_t> is usable])
674 # gcc 4.3.0 doesn't recognize the printf attribute on a template
675 # function. Check for that. This is gcc bug 35546. This test can
676 # probably be removed after the bug has been fixed for a while.
677 AC_CACHE_CHECK([whether we can use attributes with template functions],
678 [gold_cv_template_attribute],
679 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([
680 template<typename T> extern void foo(const char*, ...)
681 __attribute__ ((__format__ (__printf__, 1, 2)));
682 template<typename T> void foo(const char* format, ...) {}
683 void bar() { foo<int>("%s\n", "foo"); }
684 ])], [gold_cv_template_attribute=yes], [gold_cv_template_attribute=no])])
685 if test "$gold_cv_template_attribute" = "yes"; then
686 AC_DEFINE(HAVE_TEMPLATE_ATTRIBUTES, 1,
687 [Define if attributes work on C++ templates])
690 dnl Check if the system has struct stat::st_mtim.
691 AC_CACHE_CHECK([for struct stat::st_mtim.],
692 [gold_cv_stat_st_mtim],
693 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
694 #include <sys/stat.h>
695 long bar() { struct stat s; return (long)(s.st_mtim.tv_sec + s.st_mtim.tv_sec);}
696 ]])], [gold_cv_stat_st_mtim=yes], [gold_cv_stat_st_mtim=no])])
697 if test "$gold_cv_stat_st_mtim" = "yes"; then
698 AC_DEFINE(HAVE_STAT_ST_MTIM, 1,
699 [Define if struct stat has a field st_mtim with timespec for mtime])
704 AC_CHECK_HEADERS(locale.h)
705 AC_CHECK_FUNCS(setlocale)
710 AC_OUTPUT(Makefile testsuite/Makefile po/Makefile.in:po/Make-in)