1 # configure.ac -- Backtrace configure script.
2 # Copyright (C) 2012-2022 Free Software Foundation, Inc.
4 # Redistribution and use in source and binary forms, with or without
5 # modification, are permitted provided that the following conditions are
8 # (1) Redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer.
11 # (2) Redistributions in binary form must reproduce the above copyright
12 # notice, this list of conditions and the following disclaimer in
13 # the documentation and/or other materials provided with the
16 # (3) The name of the author may not be used to
17 # endorse or promote products derived from this software without
18 # specific prior written permission.
20 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
22 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
23 # DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
24 # INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
25 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
26 # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
28 # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
29 # IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 # POSSIBILITY OF SUCH DAMAGE.
32 AC_INIT(package-unused, version-unused,, libbacktrace)
33 AC_CONFIG_SRCDIR(backtrace.h)
34 AC_CONFIG_HEADER(config.h)
36 if test -n "${with_target_subdir}"; then
37 AM_ENABLE_MULTILIB(, ..)
41 target_alias=${target_alias-$host_alias}
43 AC_USE_SYSTEM_EXTENSIONS
46 AC_SUBST(libtool_VERSION)
48 # 1.11.1: Require that version of automake.
49 # foreign: Don't require README, INSTALL, NEWS, etc.
50 # no-define: Don't define PACKAGE and VERSION.
51 # no-dependencies: Don't generate automatic dependencies.
52 # (because it breaks when using bootstrap-lean, since some of the
53 # headers are gone at "make install" time).
54 # -Wall: Issue all automake warnings.
55 # -Wno-portability: Don't warn about constructs supported by GNU make.
56 # (because GCC requires GNU make anyhow).
57 AM_INIT_AUTOMAKE([1.11.1 foreign no-dist no-define no-dependencies -Wall -Wno-portability])
61 AC_ARG_WITH(target-subdir,
62 [ --with-target-subdir=SUBDIR Configuring in a subdirectory for target])
64 # We must force CC to /not/ be precious variables; otherwise
65 # the wrong, non-multilib-adjusted value will be used in multilibs.
66 # As a side effect, we have to subst CFLAGS ourselves.
67 m4_rename([_AC_ARG_VAR_PRECIOUS],[backtrace_PRECIOUS])
68 m4_define([_AC_ARG_VAR_PRECIOUS],[])
70 m4_rename_force([backtrace_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
78 "") AC_MSG_ERROR([can't build without awk]) ;;
81 AC_CHECK_PROG(DWZ, dwz, dwz)
82 AM_CONDITIONAL(HAVE_DWZ, test "$DWZ" != "")
89 backtrace_supported=yes
91 if test -n "${with_target_subdir}"; then
92 # We are compiling a GCC library. We can assume that the unwind
94 BACKTRACE_FILE="backtrace.lo simple.lo"
96 AC_CHECK_HEADER([unwind.h],
97 [AC_CHECK_FUNC([_Unwind_Backtrace],
98 [BACKTRACE_FILE="backtrace.lo simple.lo"],
99 [BACKTRACE_FILE="nounwind.lo"
100 backtrace_supported=no])],
101 [BACKTRACE_FILE="nounwind.lo"
102 backtrace_supported=no])
104 AC_SUBST(BACKTRACE_FILE)
107 if test -n "${with_target_subdir}"; then
108 EXTRA_FLAGS="-funwind-tables -frandom-seed=\$@"
110 AC_CACHE_CHECK([for -funwind-tables option],
111 [libbacktrace_cv_c_unwind_tables],
112 [CFLAGS_hold="$CFLAGS"
113 CFLAGS="$CFLAGS -funwind-tables"
115 [AC_LANG_PROGRAM([static int f() { return 0; }], [return f();])],
116 [libbacktrace_cv_c_unwind_tables=yes],
117 [libbacktrace_cv_c_unwind_tables=no])
118 CFLAGS="$CFLAGS_hold"])
119 if test "$libbacktrace_cv_c_unwind_tables" = "yes"; then
120 EXTRA_FLAGS=-funwind-tables
122 AC_CACHE_CHECK([for -frandom-seed=string option],
123 [libbacktrace_cv_c_random_seed_string],
124 [CFLAGS_hold="$CFLAGS"
125 CFLAGS="$CFLAGS -frandom-seed=conftest.lo"
127 [AC_LANG_PROGRAM([], [return 0;])],
128 [libbacktrace_cv_c_random_seed_string=yes],
129 [libbacktrace_cv_c_random_seed_string=no])
130 CFLAGS="$CFLAGS_hold"])
131 if test "$libbacktrace_cv_c_random_seed_string" = "yes"; then
132 EXTRA_FLAGS="$EXTRA_FLAGS -frandom-seed=\$@"
136 if test -n "${with_target_subdir}"; then
137 # Add CET specific flags is Intel CET is enabled.
138 GCC_CET_FLAGS(CET_FLAGS)
139 EXTRA_FLAGS="$EXTRA_FLAGS $CET_FLAGS"
141 AC_SUBST(EXTRA_FLAGS)
143 ACX_PROG_CC_WARNING_OPTS([-W -Wall -Wwrite-strings -Wstrict-prototypes \
144 -Wmissing-prototypes -Wold-style-definition \
145 -Wmissing-format-attribute -Wcast-qual],
148 AC_ARG_ENABLE([werror],
149 [AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
150 AS_IF([test "x$enable_werror" != "xno" && test -n "${with_target_subdir}"],
151 [WARN_FLAGS="$WARN_FLAGS -Werror"])
154 if test -n "${with_target_subdir}"; then
155 GCC_CHECK_UNWIND_GETIPINFO
157 ac_save_CFFLAGS="$CFLAGS"
158 CFLAGS="$CFLAGS -Werror-implicit-function-declaration"
159 AC_MSG_CHECKING([for _Unwind_GetIPInfo])
163 struct _Unwind_Context *context;
164 int ip_before_insn = 0;],
165 [return _Unwind_GetIPInfo (context, &ip_before_insn);])],
166 [have_unwind_getipinfo=yes], [have_unwind_getipinfo=no])
167 CFLAGS="$ac_save_CFLAGS"
168 AC_MSG_RESULT([$have_unwind_getipinfo])
169 if test "$have_unwind_getipinfo" = "yes"; then
170 AC_DEFINE(HAVE_GETIPINFO, 1, [Define if _Unwind_GetIPInfo is available.])
174 # Enable --enable-host-shared.
175 AC_ARG_ENABLE(host-shared,
176 [AS_HELP_STRING([--enable-host-shared],
177 [build host code as shared libraries])],
178 [PIC_FLAG=-fPIC], [PIC_FLAG=])
181 # Enable Intel CET on Intel CET enabled host if jit is enabled.
182 GCC_CET_HOST_FLAGS(CET_HOST_FLAGS)
183 case x$enable_languages in
190 AC_SUBST(CET_HOST_FLAGS)
192 # Test for __sync support.
193 AC_CACHE_CHECK([__sync extensions],
194 [libbacktrace_cv_sys_sync],
195 [if test -n "${with_target_subdir}"; then
197 hppa*-*-hpux*) libbacktrace_cv_sys_sync=no ;;
198 *) libbacktrace_cv_sys_sync=yes ;;
202 [AC_LANG_PROGRAM([int i;],
203 [__sync_bool_compare_and_swap (&i, i, i);
204 __sync_lock_test_and_set (&i, 1);
205 __sync_lock_release (&i);])],
206 [libbacktrace_cv_sys_sync=yes],
207 [libbacktrace_cv_sys_sync=no])
209 BACKTRACE_SUPPORTS_THREADS=0
210 if test "$libbacktrace_cv_sys_sync" = "yes"; then
211 BACKTRACE_SUPPORTS_THREADS=1
212 AC_DEFINE([HAVE_SYNC_FUNCTIONS], 1,
213 [Define to 1 if you have the __sync functions])
215 AC_SUBST(BACKTRACE_SUPPORTS_THREADS)
217 # Test for __atomic support.
218 AC_CACHE_CHECK([__atomic extensions],
219 [libbacktrace_cv_sys_atomic],
220 [if test -n "${with_target_subdir}"; then
221 libbacktrace_cv_sys_atomic=yes
224 [AC_LANG_PROGRAM([int i;],
225 [__atomic_load_n (&i, __ATOMIC_ACQUIRE);
226 __atomic_store_n (&i, 1, __ATOMIC_RELEASE);])],
227 [libbacktrace_cv_sys_atomic=yes],
228 [libbacktrace_cv_sys_atomic=no])
230 if test "$libbacktrace_cv_sys_atomic" = "yes"; then
231 AC_DEFINE([HAVE_ATOMIC_FUNCTIONS], 1,
232 [Define to 1 if you have the __atomic functions])
235 # The library needs to be able to read the executable itself. Compile
236 # a file to determine the executable format. The awk script
237 # filetype.awk prints out the file type.
238 AC_CACHE_CHECK([output filetype],
239 [libbacktrace_cv_sys_filetype],
242 [AC_LANG_PROGRAM([int i;], [int j;])],
243 [filetype=`${AWK} -f $srcdir/filetype.awk conftest.$ac_objext`],
244 [AC_MSG_FAILURE([compiler failed])])
245 libbacktrace_cv_sys_filetype=$filetype])
247 # Match the file type to decide what files to compile.
249 backtrace_supports_data=yes
250 case "$libbacktrace_cv_sys_filetype" in
251 elf*) FORMAT_FILE="elf.lo" ;;
252 macho) FORMAT_FILE="macho.lo" ;;
253 pecoff) FORMAT_FILE="pecoff.lo"
254 backtrace_supports_data=no
256 xcoff*) FORMAT_FILE="xcoff.lo"
257 backtrace_supports_data=no
259 *) AC_MSG_WARN([could not determine output file type])
260 FORMAT_FILE="unknown.lo"
261 backtrace_supported=no
264 AC_SUBST(FORMAT_FILE)
268 case "$libbacktrace_cv_sys_filetype" in
273 AC_DEFINE_UNQUOTED([BACKTRACE_ELF_SIZE], [$elfsize], [ELF size: 32 or 64])
274 AM_CONDITIONAL(HAVE_ELF, test "$FORMAT_FILE" = "elf.lo")
278 case "$libbacktrace_cv_sys_filetype" in
279 xcoff32) xcoffsize=32 ;;
280 xcoff64) xcoffsize=64 ;;
283 AC_DEFINE_UNQUOTED([BACKTRACE_XCOFF_SIZE], [$xcoffsize], [XCOFF size: 32 or 64])
285 BACKTRACE_SUPPORTED=0
286 if test "$backtrace_supported" = "yes"; then
287 BACKTRACE_SUPPORTED=1
289 AC_SUBST(BACKTRACE_SUPPORTED)
291 BACKTRACE_SUPPORTS_DATA=0
292 if test "$backtrace_supports_data" = "yes"; then
293 BACKTRACE_SUPPORTS_DATA=1
295 AC_SUBST(BACKTRACE_SUPPORTS_DATA)
297 GCC_HEADER_STDINT(gstdint.h)
299 AC_CHECK_HEADERS(sys/mman.h)
300 if test "$ac_cv_header_sys_mman_h" = "no"; then
303 if test -n "${with_target_subdir}"; then
304 # When built as a GCC target library, we can't do a link test. We
305 # simply assume that if we have mman.h, we have mmap.
309 # DJGPP has sys/man.h, but no mmap
313 AC_CHECK_FUNC(mmap, [have_mmap=yes], [have_mmap=no])
316 if test "$have_mmap" = "no"; then
321 AC_PREPROC_IFELSE([AC_LANG_SOURCE([
322 #include <sys/mman.h>
323 #if !defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
324 #error no MAP_ANONYMOUS
326 ])], [ALLOC_FILE=mmap.lo], [ALLOC_FILE=alloc.lo])
331 BACKTRACE_USES_MALLOC=0
332 if test "$ALLOC_FILE" = "alloc.lo"; then
333 BACKTRACE_USES_MALLOC=1
335 AC_SUBST(BACKTRACE_USES_MALLOC)
337 # Check for dl_iterate_phdr.
338 AC_CHECK_HEADERS(link.h sys/link.h)
339 if test "$ac_cv_header_link_h" = "no" -a "$ac_cv_header_sys_link_h" = "no"; then
340 have_dl_iterate_phdr=no
342 if test -n "${with_target_subdir}"; then
344 if test "$ac_cv_header_link_h" = "no"; then
347 # When built as a GCC target library, we can't do a link test.
348 AC_EGREP_HEADER([dl_iterate_phdr], [$link_h], [have_dl_iterate_phdr=yes],
349 [have_dl_iterate_phdr=no])
351 AC_CHECK_FUNC([dl_iterate_phdr], [have_dl_iterate_phdr=yes],
352 [have_dl_iterate_phdr=no])
355 if test "$have_dl_iterate_phdr" = "yes"; then
356 AC_DEFINE(HAVE_DL_ITERATE_PHDR, 1, [Define if dl_iterate_phdr is available.])
359 # Check for header file for Mach-O image functions.
360 AC_CHECK_HEADERS(mach-o/dyld.h)
362 # Check for loadquery.
363 AC_CHECK_HEADERS(sys/ldr.h)
364 if test "$ac_cv_header_sys_ldr_h" = "no"; then
367 if test -n "${with_target_subdir}"; then
368 # When built as a GCC target library, we can't do a link test.
369 AC_EGREP_HEADER([loadquery], [sys/ldr.h], [have_loadquery=yes],
372 AC_CHECK_FUNC([loadquery], [have_loadquery=yes],
376 if test "$have_loadquery" = "yes"; then
377 AC_DEFINE(HAVE_LOADQUERY, 1, [Define if AIX loadquery is available.])
380 # Check for the fcntl function.
381 if test -n "${with_target_subdir}"; then
383 *-*-mingw*) have_fcntl=no ;;
387 AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
389 if test "$have_fcntl" = "yes"; then
390 AC_DEFINE([HAVE_FCNTL], 1,
391 [Define to 1 if you have the fcntl function])
394 AC_CHECK_DECLS([strnlen, getpagesize])
395 AC_CHECK_FUNCS(lstat readlink)
397 # Check for getexecname function.
398 if test -n "${with_target_subdir}"; then
400 *-*-solaris2*) have_getexecname=yes ;;
401 *) have_getexecname=no ;;
404 AC_CHECK_FUNC(getexecname, [have_getexecname=yes], [have_getexecname=no])
406 if test "$have_getexecname" = "yes"; then
407 AC_DEFINE(HAVE_GETEXECNAME, 1, [Define if getexecname is available.])
410 # Check for sysctl definitions.
412 AC_CACHE_CHECK([for KERN_PROC],
413 [libbacktrace_cv_proc],
416 #include <sys/types.h>
417 #include <sys/sysctl.h>
418 ], [int mib0 = CTL_KERN; int mib1 = KERN_PROC; int mib2 = KERN_PROC_PATHNAME;])],
419 [libbacktrace_cv_proc=yes],
420 [libbacktrace_cv_proc=no])])
421 if test "$libbacktrace_cv_proc" = "yes"; then
422 AC_DEFINE([HAVE_KERN_PROC], 1,
423 [Define to 1 if you have KERN_PROC and KERN_PROC_PATHNAME in <sys/sysctl.h>.])
426 AC_CACHE_CHECK([for KERN_PROG_ARGS],
427 [libbacktrace_cv_procargs],
430 #include <sys/types.h>
431 #include <sys/sysctl.h>
432 ], [int mib0 = CTL_KERN; int mib1 = KERN_PROC_ARGS; int mib2 = KERN_PROC_PATHNAME;])],
433 [libbacktrace_cv_procargs=yes],
434 [libbacktrace_cv_procargs=no])])
435 if test "$libbacktrace_cv_procargs" = "yes"; then
436 AC_DEFINE([HAVE_KERN_PROC_ARGS], 1,
437 [Define to 1 if you have KERN_PROCARGS and KERN_PROC_PATHNAME in <sys/sysctl.h>.])
440 # Check for the clock_gettime function.
441 AC_CHECK_FUNCS(clock_gettime)
443 # At least for glibc, clock_gettime is in librt. But don't
444 # pull that in if it still doesn't give us the function we want. This
445 # test is copied from libgomp, and modified to not link in -lrt as
446 # we're using this for test timing only.
447 if test "$ac_cv_func_clock_gettime" = no; then
448 AC_CHECK_LIB(rt, clock_gettime,
449 [CLOCK_GETTIME_LINK=-lrt
450 AC_DEFINE(HAVE_CLOCK_GETTIME, 1,
451 [Define to 1 if you have the `clock_gettime' function.])])
453 AC_SUBST(CLOCK_GETTIME_LINK)
455 dnl Test whether the compiler supports the -pthread option.
456 AC_CACHE_CHECK([whether -pthread is supported],
457 [libgo_cv_lib_pthread],
459 CFLAGS="$CFLAGS -pthread"
460 AC_COMPILE_IFELSE([AC_LANG_SOURCE([int i;])],
461 [libgo_cv_lib_pthread=yes],
462 [libgo_cv_lib_pthread=no])
463 CFLAGS=$CFLAGS_hold])
465 if test "$libgo_cv_lib_pthread" = yes; then
466 PTHREAD_CFLAGS=-pthread
468 AC_SUBST(PTHREAD_CFLAGS)
470 AM_CONDITIONAL(HAVE_PTHREAD, test "$libgo_cv_lib_pthread" = yes)
472 dnl Test whether the compiler and the linker support the -gdwarf-5 option.
473 AC_CACHE_CHECK([whether -gdwarf-5 is supported],
474 [libbacktrace_cv_lib_dwarf5],
476 CFLAGS="$CFLAGS -gdwarf-5"
477 AC_LINK_IFELSE([AC_LANG_PROGRAM([int i;], [return 0;])],
478 [libbacktrace_cv_lib_dwarf5=yes],
479 [libbacktrace_cv_lib_dwarf5=no])
480 CFLAGS=$CFLAGS_hold])
481 AM_CONDITIONAL(HAVE_DWARF5, test "$libbacktrace_cv_lib_dwarf5" = yes)
483 AC_CHECK_LIB([z], [compress],
484 [AC_DEFINE(HAVE_ZLIB, 1, [Define if -lz is available.])])
485 AM_CONDITIONAL(HAVE_ZLIB, test "$ac_cv_lib_z_compress" = yes)
487 dnl Test whether the linker supports the --compress_debug_sections option.
488 AC_CACHE_CHECK([whether --compress-debug-sections is supported],
489 [libgo_cv_ld_compress],
490 [LDFLAGS_hold=$LDFLAGS
491 LDFLAGS="$LDFLAGS -Wl,--compress-debug-sections=zlib-gnu"
492 AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
493 [libgo_cv_ld_compress=yes],
494 [libgo_cv_ld_compress=no])
495 LDFLAGS=$LDFLAGS_hold])
496 AM_CONDITIONAL(HAVE_COMPRESSED_DEBUG, test "$libgo_cv_ld_compress" = yes)
498 AC_CHECK_LIB([zstd], [ZSTD_compress],
499 [AC_DEFINE(HAVE_ZSTD, 1, [Define if -lzstd is available.])])
500 AM_CONDITIONAL(HAVE_ZSTD, test "$ac_cv_lib_zstd_ZSTD_compress" = yes)
502 dnl Test whether the linker supports --compress-debug-sections=zstd option.
503 AC_CACHE_CHECK([whether --compress-debug-sections=zstd is supported],
504 [libgo_cv_ld_compress_zstd],
505 [LDFLAGS_hold=$LDFLAGS
506 LDFLAGS="$LDFLAGS -Wl,--compress-debug-sections=zstd"
507 AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
508 [libgo_cv_ld_compress_zstd=yes],
509 [libgo_cv_ld_compress_zstd=no])
510 LDFLAGS=$LDFLAGS_hold])
511 AM_CONDITIONAL(HAVE_COMPRESSED_DEBUG_ZSTD, test "$libgo_cv_ld_compress_zstd" = yes)
513 AC_ARG_VAR(OBJCOPY, [location of objcopy])
514 AC_CHECK_PROG(OBJCOPY, objcopy, objcopy,)
515 AC_CHECK_PROG(READELF, readelf, readelf)
516 AC_CACHE_CHECK([whether objcopy supports debuglink],
517 [libbacktrace_cv_objcopy_debuglink],
518 [if test -n "${with_target_subdir}"; then
519 libbacktrace_cv_objcopy_debuglink=no
520 elif ! test -n "${OBJCOPY}"; then
521 libbacktrace_cv_objcopy_debuglink=no
522 elif ${OBJCOPY} --help | grep add-gnu-debuglink >/dev/null 2>&1; then
523 libbacktrace_cv_objcopy_debuglink=yes
525 libbacktrace_cv_objcopy_debuglink=no
527 AM_CONDITIONAL(HAVE_OBJCOPY_DEBUGLINK, test "$libbacktrace_cv_objcopy_debuglink" = yes)
529 AC_ARG_VAR(DSYMUTIL, [location of dsymutil])
530 AC_CHECK_PROG(DSYMUTIL, dsymutil, dsymutil)
531 AM_CONDITIONAL(USE_DSYMUTIL, test -n "${DSYMUTIL}" -a "$FORMAT_FILE" = "macho.lo")
533 AC_ARG_VAR(NM, [location of nm])
534 AC_CHECK_PROG(NM, nm, nm)
536 AC_CHECK_PROG(XZ, xz, xz)
537 AM_CONDITIONAL(HAVE_XZ, test "$XZ" != "")
538 AC_CHECK_PROG(COMM, comm, comm)
539 AM_CONDITIONAL(HAVE_COMM, test "$COMM" != "")
541 AM_CONDITIONAL(HAVE_MINIDEBUG,
542 test "${with_target_subdir}" = "" -a "$FORMAT_FILE" = "elf.lo" -a "${OBJCOPY}" != "" -a "${NM}" != "" -a "${XZ}" != "" -a "${COMM}" != "")
544 AC_CHECK_LIB([lzma], [lzma_auto_decoder],
545 [AC_DEFINE(HAVE_LIBLZMA, 1, [Define if -llzma is available.])])
546 AM_CONDITIONAL(HAVE_LIBLZMA, test "$ac_cv_lib_lzma_lzma_auto_decoder" = yes)
548 AC_CACHE_CHECK([whether tests can run],
549 [libbacktrace_cv_sys_native],
550 [AC_RUN_IFELSE([AC_LANG_PROGRAM([], [return 0;])],
551 [libbacktrace_cv_sys_native=yes],
552 [libbacktrace_cv_sys_native=no],
553 [libbacktrace_cv_sys_native=no])])
554 AM_CONDITIONAL(NATIVE, test "$libbacktrace_cv_sys_native" = "yes")
556 if test "${multilib}" = "yes"; then
557 multilib_arg="--enable-multilib"
562 AC_CONFIG_FILES(Makefile backtrace-supported.h)
563 AC_CONFIG_FILES(install-debuginfo-for-buildid.sh, chmod +x install-debuginfo-for-buildid.sh)
565 # We need multilib support, but only if configuring for the target.
566 AC_CONFIG_COMMANDS([default],
567 [if test -n "$CONFIG_FILES"; then
568 if test -n "${with_target_subdir}"; then
569 # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
570 # that multilib installs will end up installed in the correct place.
571 # The testsuite needs it for multilib-aware ABI baseline files.
572 # To work around this not being passed down from config-ml.in ->
573 # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
574 # append it here. Only modify Makefiles that have just been created.
576 # Also, get rid of this simulated-VPATH thing that automake does.
578 s!`test -f '$<' || echo '$(srcdir)/'`!!
580 for i in $SUBDIRS; do
581 case $CONFIG_FILES in
583 #echo "Adding MULTISUBDIR to $i/Makefile"
584 sed -f vpsed $i/Makefile > tmp
585 grep '^MULTISUBDIR =' Makefile >> tmp
595 # Variables needed in config.status (file generation) which aren't already
596 # passed by autoconf.