1 m4_include(../config/accross.m4)
2 m4_include(../config/acx.m4)
3 m4_include(../config/gettext-sister.m4)
4 m4_include(../config/iconv.m4)
5 m4_include(../config/lcmessage.m4)
6 m4_include(../config/lib-ld.m4)
7 m4_include(../config/lib-link.m4)
8 m4_include(../config/lib-prefix.m4)
9 m4_include(../config/progtest.m4)
11 dnl See whether we need a declaration for a function.
12 dnl The result is highly dependent on the INCLUDES passed in, so make sure
13 dnl to use a different cache variable name in this macro if it is invoked
14 dnl in a different context somewhere else.
15 dnl gcc_AC_CHECK_DECL(SYMBOL,
16 dnl [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, INCLUDES]]])
17 AC_DEFUN([gcc_AC_CHECK_DECL],
18 [AC_MSG_CHECKING([whether $1 is declared])
19 AC_CACHE_VAL(gcc_cv_have_decl_$1,
22 char *(*pfn) = (char *(*)) $1 ;
23 #endif], eval "gcc_cv_have_decl_$1=yes", eval "gcc_cv_have_decl_$1=no")])
24 if eval "test \"`echo '$gcc_cv_have_decl_'$1`\" = yes"; then
25 AC_MSG_RESULT(yes) ; ifelse([$2], , :, [$2])
27 AC_MSG_RESULT(no) ; ifelse([$3], , :, [$3])
31 dnl Check multiple functions to see whether each needs a declaration.
32 dnl Arrange to define HAVE_DECL_<FUNCTION> to 0 or 1 as appropriate.
33 dnl gcc_AC_CHECK_DECLS(SYMBOLS,
34 dnl [ACTION-IF-NEEDED [, ACTION-IF-NOT-NEEDED [, INCLUDES]]])
35 AC_DEFUN([gcc_AC_CHECK_DECLS],
36 [AC_FOREACH([gcc_AC_Func], [$1],
37 [AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_[]gcc_AC_Func),
38 [Define to 1 if we found a declaration for ']gcc_AC_Func[', otherwise
42 ac_tr_decl=AS_TR_CPP([HAVE_DECL_$ac_func])
43 gcc_AC_CHECK_DECL($ac_func,
44 [AC_DEFINE_UNQUOTED($ac_tr_decl, 1) $2],
45 [AC_DEFINE_UNQUOTED($ac_tr_decl, 0) $3],
46 dnl It is possible that the include files passed in here are local headers
47 dnl which supply a backup declaration for the relevant prototype based on
48 dnl the definition of (or lack of) the HAVE_DECL_ macro. If so, this test
49 dnl will always return success. E.g. see libiberty.h's handling of
50 dnl `basename'. To avoid this, we define the relevant HAVE_DECL_ macro to
51 dnl 1 so that any local headers used do not provide their own prototype
60 dnl 'make compare' can be significantly faster, if cmp itself can
61 dnl skip bytes instead of using tail. The test being performed is
62 dnl "if cmp --ignore-initial=2 t1 t2 && ! cmp --ignore-initial=1 t1 t2"
63 dnl but we need to sink errors and handle broken shells. We also test
64 dnl for the parameter format "cmp file1 file2 skip1 skip2" which is
65 dnl accepted by cmp on some systems.
66 AC_DEFUN([gcc_AC_PROG_CMP_IGNORE_INITIAL],
67 [AC_CACHE_CHECK([for cmp's capabilities], gcc_cv_prog_cmp_skip,
70 gcc_cv_prog_cmp_skip=slowcompare
71 if cmp --ignore-initial=2 t1 t2 > /dev/null 2>&1; then
72 if cmp --ignore-initial=1 t1 t2 > /dev/null 2>&1; then
75 gcc_cv_prog_cmp_skip=gnucompare
78 if test $gcc_cv_prog_cmp_skip = slowcompare ; then
79 if cmp t1 t2 2 2 > /dev/null 2>&1; then
80 if cmp t1 t2 1 1 > /dev/null 2>&1; then
83 gcc_cv_prog_cmp_skip=fastcompare
89 make_compare_target=$gcc_cv_prog_cmp_skip
90 AC_SUBST(make_compare_target)
93 dnl See if the printf functions in libc support %p in format strings.
94 AC_DEFUN([gcc_AC_FUNC_PRINTF_PTR],
95 [AC_CACHE_CHECK(whether the printf functions support %p,
96 gcc_cv_func_printf_ptr,
97 [AC_TRY_RUN([#include <stdio.h>
102 char *p = buf, *q = NULL;
103 sprintf(buf, "%p", p);
104 sscanf(buf, "%p", &q);
106 }], gcc_cv_func_printf_ptr=yes, gcc_cv_func_printf_ptr=no,
107 gcc_cv_func_printf_ptr=no)
108 rm -f core core.* *.core])
109 if test $gcc_cv_func_printf_ptr = yes ; then
110 AC_DEFINE(HAVE_PRINTF_PTR, 1, [Define if printf supports "%p".])
114 dnl See if symbolic links work and if not, try to substitute either hard links or simple copy.
115 AC_DEFUN([gcc_AC_PROG_LN_S],
116 [AC_MSG_CHECKING(whether ln -s works)
117 AC_CACHE_VAL(gcc_cv_prog_LN_S,
118 [rm -f conftestdata_t
120 if ln -s conftestdata_f conftestdata_t 2>/dev/null
122 gcc_cv_prog_LN_S="ln -s"
124 if ln conftestdata_f conftestdata_t 2>/dev/null
131 rm -f conftestdata_f conftestdata_t
133 LN_S="$gcc_cv_prog_LN_S"
134 if test "$gcc_cv_prog_LN_S" = "ln -s"; then
137 if test "$gcc_cv_prog_LN_S" = "ln"; then
138 AC_MSG_RESULT([no, using ln])
140 AC_MSG_RESULT([no, and neither does ln, so using cp])
146 dnl Define MKDIR_TAKES_ONE_ARG if mkdir accepts only one argument instead
148 AC_DEFUN([gcc_AC_FUNC_MKDIR_TAKES_ONE_ARG],
149 [AC_CACHE_CHECK([if mkdir takes one argument], gcc_cv_mkdir_takes_one_arg,
151 #include <sys/types.h>
152 #ifdef HAVE_SYS_STAT_H
153 # include <sys/stat.h>
160 #endif], [mkdir ("foo", 0);],
161 gcc_cv_mkdir_takes_one_arg=no, gcc_cv_mkdir_takes_one_arg=yes)])
162 if test $gcc_cv_mkdir_takes_one_arg = yes ; then
163 AC_DEFINE(MKDIR_TAKES_ONE_ARG, 1, [Define if host mkdir takes a single argument.])
167 AC_DEFUN([gcc_AC_PROG_INSTALL],
168 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
169 # Find a good install program. We prefer a C program (faster),
170 # so one script is as good as another. But avoid the broken or
171 # incompatible versions:
172 # SysV /etc/install, /usr/sbin/install
173 # SunOS /usr/etc/install
176 # AFS /usr/afsws/bin/install, which mishandles nonexistent args
177 # SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
178 # ./install, which can be erroneously created by make from ./install.sh.
179 AC_MSG_CHECKING(for a BSD compatible install)
180 if test -z "$INSTALL"; then
181 AC_CACHE_VAL(ac_cv_path_install,
182 [ IFS="${IFS= }"; ac_save_IFS="$IFS"; IFS="${IFS}:"
183 for ac_dir in $PATH; do
184 # Account for people who put trailing slashes in PATH elements.
186 /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;
188 # OSF1 and SCO ODT 3.0 have their own names for install.
189 for ac_prog in ginstall scoinst install; do
190 if test -f $ac_dir/$ac_prog; then
191 if test $ac_prog = install &&
192 grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then
193 # AIX install. It has an incompatible calling convention.
194 # OSF/1 installbsd also uses dspmsg, but is usable.
197 ac_cv_path_install="$ac_dir/$ac_prog -c"
207 if test "${ac_cv_path_install+set}" = set; then
208 INSTALL="$ac_cv_path_install"
210 # As a last resort, use the slow shell script. We don't cache a
211 # path for INSTALL within a source directory, because that will
212 # break other packages using the cache if that directory is
213 # removed, or if the path is relative.
214 INSTALL="$ac_install_sh"
217 dnl We do special magic for INSTALL instead of AC_SUBST, to get
218 dnl relative paths right.
219 AC_MSG_RESULT($INSTALL)
222 # Use test -z because SunOS4 sh mishandles braces in ${var-val}.
223 # It thinks the first close brace ends the variable substitution.
224 test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
225 AC_SUBST(INSTALL_PROGRAM)dnl
227 test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
228 AC_SUBST(INSTALL_DATA)dnl
231 # mmap(2) blacklisting. Some platforms provide the mmap library routine
232 # but don't support all of the features we need from it.
233 AC_DEFUN([gcc_AC_FUNC_MMAP_BLACKLIST],
235 AC_CHECK_HEADER([sys/mman.h],
236 [gcc_header_sys_mman_h=yes], [gcc_header_sys_mman_h=no])
237 AC_CHECK_FUNC([mmap], [gcc_func_mmap=yes], [gcc_func_mmap=no])
238 if test "$gcc_header_sys_mman_h" != yes \
239 || test "$gcc_func_mmap" != yes; then
240 gcc_cv_func_mmap_file=no
241 gcc_cv_func_mmap_dev_zero=no
242 gcc_cv_func_mmap_anon=no
244 AC_CACHE_CHECK([whether read-only mmap of a plain file works],
245 gcc_cv_func_mmap_file,
246 [# Add a system to this blacklist if
247 # mmap(0, stat_size, PROT_READ, MAP_PRIVATE, fd, 0) doesn't return a
248 # memory area containing the same data that you'd get if you applied
249 # read() to the same fd. The only system known to have a problem here
250 # is VMS, where text files have record structure.
253 gcc_cv_func_mmap_file=no ;;
255 gcc_cv_func_mmap_file=yes;;
257 AC_CACHE_CHECK([whether mmap from /dev/zero works],
258 gcc_cv_func_mmap_dev_zero,
259 [# Add a system to this blacklist if it has mmap() but /dev/zero
260 # does not exist, or if mmapping /dev/zero does not give anonymous
261 # zeroed pages with both the following properties:
262 # 1. If you map N consecutive pages in with one call, and then
263 # unmap any subset of those pages, the pages that were not
264 # explicitly unmapped remain accessible.
265 # 2. If you map two adjacent blocks of memory and then unmap them
266 # both at once, they must both go away.
267 # Systems known to be in this category are Windows (all variants),
270 vms* | cygwin* | pe | mingw* | darwin* | ultrix* | hpux10* | hpux11.00)
271 gcc_cv_func_mmap_dev_zero=no ;;
273 gcc_cv_func_mmap_dev_zero=yes;;
276 # Unlike /dev/zero, the MAP_ANON(YMOUS) defines can be probed for.
277 AC_CACHE_CHECK([for MAP_ANON(YMOUS)], gcc_cv_decl_map_anon,
279 [#include <sys/types.h>
280 #include <sys/mman.h>
283 #ifndef MAP_ANONYMOUS
284 #define MAP_ANONYMOUS MAP_ANON
287 [int n = MAP_ANONYMOUS;],
288 gcc_cv_decl_map_anon=yes,
289 gcc_cv_decl_map_anon=no)])
291 if test $gcc_cv_decl_map_anon = no; then
292 gcc_cv_func_mmap_anon=no
294 AC_CACHE_CHECK([whether mmap with MAP_ANON(YMOUS) works],
295 gcc_cv_func_mmap_anon,
296 [# Add a system to this blacklist if it has mmap() and MAP_ANON or
297 # MAP_ANONYMOUS, but using mmap(..., MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
298 # doesn't give anonymous zeroed pages with the same properties listed
299 # above for use of /dev/zero.
300 # Systems known to be in this category are Windows, VMS, and SCO Unix.
302 vms* | cygwin* | pe | mingw* | sco* | udk* )
303 gcc_cv_func_mmap_anon=no ;;
305 gcc_cv_func_mmap_anon=yes;;
310 if test $gcc_cv_func_mmap_file = yes; then
311 AC_DEFINE(HAVE_MMAP_FILE, 1,
312 [Define if read-only mmap of a plain file works.])
314 if test $gcc_cv_func_mmap_dev_zero = yes; then
315 AC_DEFINE(HAVE_MMAP_DEV_ZERO, 1,
316 [Define if mmap of /dev/zero works.])
318 if test $gcc_cv_func_mmap_anon = yes; then
319 AC_DEFINE(HAVE_MMAP_ANON, 1,
320 [Define if mmap with MAP_ANON(YMOUS) works.])
324 dnl Locate a program and check that its version is acceptable.
325 dnl AC_PROG_CHECK_VER(var, name, version-switch,
326 dnl version-extract-regexp, version-glob)
327 AC_DEFUN([gcc_AC_CHECK_PROG_VER],
328 [AC_CHECK_PROG([$1], [$2], [$2])
329 if test -n "[$]$1"; then
330 # Found it, now check the version.
331 AC_CACHE_CHECK(for modern $2, gcc_cv_prog_$2_modern,
332 [changequote(<<,>>)dnl
333 ac_prog_version=`<<$>>$1 $3 2>&1 |
334 sed -n 's/^.*patsubst(<<$4>>,/,\/).*$/\1/p'`
336 echo "configure:__oline__: version of $2 is $ac_prog_version" >&AC_FD_CC
337 changequote(<<,>>)dnl
338 case $ac_prog_version in
339 '') gcc_cv_prog_$2_modern=no;;
341 gcc_cv_prog_$2_modern=yes;;
342 *) gcc_cv_prog_$2_modern=no;;
347 gcc_cv_prog_$2_modern=no
351 dnl Determine if enumerated bitfields are unsigned. ISO C says they can
352 dnl be either signed or unsigned.
354 AC_DEFUN([gcc_AC_C_ENUM_BF_UNSIGNED],
355 [AC_CACHE_CHECK(for unsigned enumerated bitfields, gcc_cv_enum_bf_unsigned,
356 [AC_TRY_RUN(#include <stdlib.h>
357 enum t { BLAH = 128 } ;
358 struct s_t { enum t member : 8; } s ;
362 if (s.member < 0) exit(1);
365 }, gcc_cv_enum_bf_unsigned=yes, gcc_cv_enum_bf_unsigned=no, gcc_cv_enum_bf_unsigned=yes)])
366 if test $gcc_cv_enum_bf_unsigned = yes; then
367 AC_DEFINE(ENUM_BITFIELDS_ARE_UNSIGNED, 1,
368 [Define if enumerated bitfields are treated as unsigned values.])
371 dnl Probe number of bits in a byte.
372 dnl Note C89 requires CHAR_BIT >= 8.
374 AC_DEFUN([gcc_AC_C_CHAR_BIT],
375 [AC_CACHE_CHECK(for CHAR_BIT, gcc_cv_decl_char_bit,
377 [#ifdef HAVE_LIMITS_H
382 #endif], gcc_cv_decl_char_bit=yes, gcc_cv_decl_char_bit=no)
384 if test $gcc_cv_decl_char_bit = no; then
385 AC_CACHE_CHECK(number of bits in a byte, gcc_cv_c_nbby,
388 while test $i -lt 65; do
391 case (unsigned char)((unsigned long)1 << $i) == ((unsigned long)1 << $i):
392 case (unsigned char)((unsigned long)1<<($i-1)) == ((unsigned long)1<<($i-1)):
394 [gcc_cv_c_nbby=$i; break])
397 test -z "$gcc_cv_c_nbby" && gcc_cv_c_nbby=failed
399 if test $gcc_cv_c_nbby = failed; then
400 AC_MSG_ERROR(cannot determine number of bits in a byte)
402 AC_DEFINE_UNQUOTED(CHAR_BIT, $gcc_cv_c_nbby,
403 [Define as the number of bits in a byte, if \`limits.h' doesn't.])
407 dnl Checking for long long.
408 dnl By Caolan McNamara <caolan@skynet.ie>
409 dnl Added check for __int64, Zack Weinberg <zackw@stanford.edu>
411 AC_DEFUN([gcc_AC_C_LONG_LONG],
412 [AC_CACHE_CHECK(for long long int, ac_cv_c_long_long,
413 [AC_TRY_COMPILE(,[long long int i;],
414 ac_cv_c_long_long=yes,
415 ac_cv_c_long_long=no)])
416 if test $ac_cv_c_long_long = yes; then
417 AC_DEFINE(HAVE_LONG_LONG, 1,
418 [Define if your compiler supports the \`long long' type.])
420 AC_CACHE_CHECK(for __int64, ac_cv_c___int64,
421 [AC_TRY_COMPILE(,[__int64 i;],
423 ac_cv_c___int64=no)])
424 if test $ac_cv_c___int64 = yes; then
425 AC_DEFINE(HAVE___INT64, 1,
426 [Define if your compiler supports the \`__int64' type.])
430 AC_DEFUN([gcc_AC_INITFINI_ARRAY],
431 [AC_ARG_ENABLE(initfini-array,
432 [ --enable-initfini-array use .init_array/.fini_array sections],
434 AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
435 gcc_cv_initfini_array, [dnl
438 int main (void) { return x; }
439 int foo (void) { x = 0; }
440 int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;],
441 [gcc_cv_initfini_array=yes], [gcc_cv_initfini_array=no],
442 [gcc_cv_initfini_array=no])])
443 enable_initfini_array=$gcc_cv_initfini_array
445 if test $enable_initfini_array = yes; then
446 AC_DEFINE(HAVE_INITFINI_ARRAY, 1,
447 [Define .init_array/.fini_array sections are available and working.])
450 dnl # _gcc_COMPUTE_GAS_VERSION
451 dnl # Used by gcc_GAS_VERSION_GTE_IFELSE
454 dnl # gcc_cv_as_gas_srcdir must be defined before this.
455 dnl # This gross requirement will go away eventually.
456 AC_DEFUN([_gcc_COMPUTE_GAS_VERSION],
457 [gcc_cv_as_bfd_srcdir=`echo $srcdir | sed -e 's,/gcc$,,'`/bfd
458 for f in $gcc_cv_as_bfd_srcdir/configure \
459 $gcc_cv_as_gas_srcdir/configure \
460 $gcc_cv_as_gas_srcdir/configure.in \
461 $gcc_cv_as_gas_srcdir/Makefile.in ; do
462 gcc_cv_gas_version=`sed -n -e 's/^[[ ]]*\(VERSION=[[0-9]]*\.[[0-9]]*.*\)/\1/p' < $f`
463 if test x$gcc_cv_gas_version != x; then
467 gcc_cv_gas_major_version=`expr "$gcc_cv_gas_version" : "VERSION=\([[0-9]]*\)"`
468 gcc_cv_gas_minor_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.\([[0-9]]*\)"`
469 gcc_cv_gas_patch_version=`expr "$gcc_cv_gas_version" : "VERSION=[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)"`
470 case $gcc_cv_gas_patch_version in
471 "") gcc_cv_gas_patch_version="0" ;;
473 gcc_cv_gas_vers=`expr \( \( $gcc_cv_gas_major_version \* 1000 \) \
474 + $gcc_cv_gas_minor_version \) \* 1000 \
475 + $gcc_cv_gas_patch_version`
476 ]) []dnl # _gcc_COMPUTE_GAS_VERSION
478 dnl # gcc_GAS_VERSION_GTE_IFELSE([elf,] major, minor, patchlevel,
479 dnl # [command_if_true = :], [command_if_false = :])
480 dnl # Check to see if the version of GAS is greater than or
481 dnl # equal to the specified version.
483 dnl # The first ifelse() shortens the shell code if the patchlevel
484 dnl # is unimportant (the usual case). The others handle missing
485 dnl # commands. Note that the tests are structured so that the most
486 dnl # common version number cases are tested first.
487 AC_DEFUN([_gcc_GAS_VERSION_GTE_IFELSE],
489 [if test $in_tree_gas_is_elf = yes \
491 [if]) test $gcc_cv_gas_vers -ge `expr \( \( $2 \* 1000 \) + $3 \) \* 1000 + $4`
493 ifelse([$5],,:,[$5])[]dnl
498 AC_DEFUN([gcc_GAS_VERSION_GTE_IFELSE],
499 [AC_REQUIRE([_gcc_COMPUTE_GAS_VERSION])dnl
500 ifelse([$1], elf, [_gcc_GAS_VERSION_GTE_IFELSE($@)],
501 [_gcc_GAS_VERSION_GTE_IFELSE(,$@)])])
503 dnl gcc_GAS_CHECK_FEATURE(description, cv, [[elf,]major,minor,patchlevel],
504 dnl [extra switches to as], [assembler input],
505 dnl [extra testing logic], [command if feature available])
507 dnl Checks for an assembler feature. If we are building an in-tree
508 dnl gas, the feature is available if the associated assembler version
509 dnl is greater than or equal to major.minor.patchlevel. If not, then
510 dnl ASSEMBLER INPUT is fed to the assembler and the feature is available
511 dnl if assembly succeeds. If EXTRA TESTING LOGIC is not the empty string,
512 dnl then it is run instead of simply setting CV to "yes" - it is responsible
513 dnl for doing so, if appropriate.
514 AC_DEFUN([gcc_GAS_CHECK_FEATURE],
515 [AC_CACHE_CHECK([assembler for $1], [$2],
518 if test $in_tree_gas = yes; then
519 gcc_GAS_VERSION_GTE_IFELSE($3, [[$2]=yes])
520 el])if test x$gcc_cv_as != x; then
521 echo ifelse(m4_substr([$5],0,1),[$], "[$5]", '[$5]') > conftest.s
522 if AC_TRY_COMMAND([$gcc_cv_as $4 -o conftest.o conftest.s >&AC_FD_CC])
524 ifelse([$6],, [$2]=yes, [$6])
526 echo "configure: failed program was" >&AC_FD_CC
527 cat conftest.s >&AC_FD_CC
529 rm -f conftest.o conftest.s
532 if test $[$2] = yes; then
538 # Like AC_PROG_CC_C_O, but changed for automake.
540 # Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
542 # This program is free software; you can redistribute it and/or modify
543 # it under the terms of the GNU General Public License as published by
544 # the Free Software Foundation; either version 2, or (at your option)
547 # This program is distributed in the hope that it will be useful,
548 # but WITHOUT ANY WARRANTY; without even the implied warranty of
549 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
550 # GNU General Public License for more details.
552 # You should have received a copy of the GNU General Public License
553 # along with this program; if not, write to the Free Software
554 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
557 AC_DEFUN([AM_PROG_CC_C_O],
558 [AC_REQUIRE([AC_PROG_CC_C_O])dnl
559 AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
560 # FIXME: we rely on the cache variable name because
561 # there is no other way.
563 ac_cc=`echo $[2] | sed ['s/[^a-zA-Z0-9_]/_/g;s/^[0-9]/_/']`
564 if eval "test \"`echo '$ac_cv_prog_cc_'${ac_cc}_c_o`\" != yes"; then
565 # Losing compiler, so override with the script.
566 # FIXME: It is wrong to rewrite CC.
567 # But if we don't then we get into trouble of one sort or another.
568 # A longer-term fix would be to have automake use am__CC in this case,
569 # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
570 CC="$am_aux_dir/compile $CC"
576 # Copyright (C) 2001, 2003 Free Software Foundation, Inc.
578 # This program is free software; you can redistribute it and/or modify
579 # it under the terms of the GNU General Public License as published by
580 # the Free Software Foundation; either version 2, or (at your option)
583 # This program is distributed in the hope that it will be useful,
584 # but WITHOUT ANY WARRANTY; without even the implied warranty of
585 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
586 # GNU General Public License for more details.
588 # You should have received a copy of the GNU General Public License
589 # along with this program; if not, write to the Free Software
590 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
593 # For projects using AC_CONFIG_AUX_DIR([foo]), Autoconf sets
594 # $ac_aux_dir to `$srcdir/foo'. In other projects, it is set to
595 # `$srcdir', `$srcdir/..', or `$srcdir/../..'.
597 # Of course, Automake must honor this variable whenever it calls a
598 # tool from the auxiliary directory. The problem is that $srcdir (and
599 # therefore $ac_aux_dir as well) can be either absolute or relative,
600 # depending on how configure is run. This is pretty annoying, since
601 # it makes $ac_aux_dir quite unusable in subdirectories: in the top
602 # source directory, any form will work fine, but in subdirectories a
603 # relative path needs to be adjusted first.
605 # $ac_aux_dir/missing
606 # fails when called from a subdirectory if $ac_aux_dir is relative
607 # $top_srcdir/$ac_aux_dir/missing
608 # fails if $ac_aux_dir is absolute,
609 # fails when called from a subdirectory in a VPATH build with
610 # a relative $ac_aux_dir
612 # The reason of the latter failure is that $top_srcdir and $ac_aux_dir
613 # are both prefixed by $srcdir. In an in-source build this is usually
614 # harmless because $srcdir is `.', but things will broke when you
615 # start a VPATH build or use an absolute $srcdir.
617 # So we could use something similar to $top_srcdir/$ac_aux_dir/missing,
618 # iff we strip the leading $srcdir from $ac_aux_dir. That would be:
619 # am_aux_dir='\$(top_srcdir)/'`expr "$ac_aux_dir" : "$srcdir//*\(.*\)"`
620 # and then we would define $MISSING as
621 # MISSING="\${SHELL} $am_aux_dir/missing"
622 # This will work as long as MISSING is not called from configure, because
623 # unfortunately $(top_srcdir) has no meaning in configure.
624 # However there are other variables, like CC, which are often used in
625 # configure, and could therefore not use this "fixed" $ac_aux_dir.
627 # Another solution, used here, is to always expand $ac_aux_dir to an
628 # absolute PATH. The drawback is that using absolute paths prevent a
629 # configured tree to be moved without reconfiguration.
631 AC_DEFUN([AM_AUX_DIR_EXPAND],
632 [dnl Rely on autoconf to set up CDPATH properly.
634 # expand $ac_aux_dir to an absolute path
635 am_aux_dir=`cd $ac_aux_dir && pwd`