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