3 AT_BANNER([Semantics.])
5 # Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2009, 2010
6 # Free Software Foundation, Inc.
8 # This program is free software: you can redistribute it and/or modify
9 # it under the terms of the GNU General Public License as published by
10 # the Free Software Foundation, either version 3 of the License, or
11 # (at your option) any later version.
13 # This program is distributed in the hope that it will be useful,
14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 # GNU General Public License for more details.
18 # You should have received a copy of the GNU General Public License
19 # along with this program. If not, see <http://www.gnu.org/licenses/>.
22 ## -------------------------------- ##
23 ## Members of the AC_CHECK family. ##
24 ## -------------------------------- ##
29 # Well, I can't imagine a system where `cos' is neither in libc, nor
30 # in libm. Nor can I imagine a lib more likely to exists than libm.
31 # But there are systems without libm, on which we don't want to have
32 # this test fail, so exit successfully if `cos' is in libc.
33 AT_CHECK_MACRO([AC_CHECK_LIB],
34 [AC_TRY_LINK_FUNC(cos,
35 [AC_MSG_ERROR([`cos' is in `libc'], 77)])
38 [AC_MSG_ERROR([cannot find `cos' in `libm'])])
40 # No kidding, using variables was broken in 2.50 :(
42 AC_CHECK_LIB(m, $ac_sin,,
43 [AC_MSG_ERROR([cannot find `\$ac_sin' (= `$ac_sin') in `libm'])])
46 AC_CHECK_LIB($ac_m, acos,,
47 [AC_MSG_ERROR([cannot find `acos' in `\$ac_m' (= `$ac_m')])])
50 AC_CHECK_LIB($ac_m, $ac_asin,,
51 [AC_MSG_ERROR([cannot find `\$ac_asin' (= `$ac_asin') in `\$ac_m' (= `$ac_m')])])
53 # But if the bug is in the caching mechanism, then be sure we
54 # correctly detect failures.
56 AC_CHECK_LIB(m, cossack,
57 [AC_MSG_ERROR([found `cossack' in `libm'])])
59 # No kidding, using variables was broken in 2.50 :(
61 AC_CHECK_LIB(m, $ac_sinner,
62 [AC_MSG_ERROR([found `\$ac_sinner' (= `$ac_sinner') in `libm'])])
65 AC_CHECK_LIB($ac_m, acossack,
66 [AC_MSG_ERROR([found `acossack' in `\$ac_m' (= `$ac_m')])])
69 AC_CHECK_LIB($ac_m, $ac_asinner,
70 [AC_MSG_ERROR([found `\$ac_asinner' (= `$ac_asinner') in `\$ac_m' (= `$ac_m')])])
77 AT_CHECK_MACRO([AC_SEARCH_LIBS],
79 AC_SEARCH_LIBS(cos, oser m ust,,
80 [AC_MSG_ERROR([cannot find `cos'])])
82 case "$ac_cv_search_cos" in
83 -loser|-lust) AC_MSG_ERROR([jeez, $ac_cv_search_cos must be a cool library!]) ;;
88 # AC_SEARCH_LIBS (none needed)
89 # ----------------------------
90 AT_CHECK_MACRO([AC_SEARCH_LIBS (none needed)],
92 AC_SEARCH_LIBS(printf, oser c ust,,
93 [AC_MSG_ERROR([cannot find `printf'])])
95 case "$ac_cv_search_printf" in
96 -loser|-lust) AC_MSG_ERROR([jeez, $ac_cv_search_printf must be a cool library!]) ;;
97 -lc) AC_MSG_ERROR([huh, you need to give -lc?])
104 # Check that it performs the correct actions:
105 AT_CHECK_MACRO([AC_CHECK_DECLS],
106 [[AC_CHECK_DECLS([yes, no, myenum, mystruct, myfunc, mymacro1, mymacro2],,,
109 struct { int x[20]; } mystruct;
111 #define mymacro1(arg) arg
113 # The difference in space-before-open-paren is intentional.
114 AC_CHECK_DECLS([basenam (char *), dirnam(char *),
115 [moreargs (char, short, int, long, void *, char [], float, double)]],,,
117 extern "C++" char *basenam (char *);
118 extern "C++" const char *basenam (const char *);
120 extern char *basenam (const char *);
125 extern int moreargs (char, short, int, long, void *,
126 char [], float, double);
131 AC_CHECK_DECL([declared (char *)],, [AS_EXIT([1])],
133 extern "C++" char *declared (char *);
134 extern "C++" const char *declared (const char *);
136 extern char *declared (const char *);
139 AC_CHECK_DECL([undeclared (char *)], [AS_EXIT([1])],, [[]])
142 [#define HAVE_DECL_BASENAM 1
143 #define HAVE_DECL_DIRNAM 0
144 #define HAVE_DECL_MOREARGS 1
145 #define HAVE_DECL_MYENUM 1
146 #define HAVE_DECL_MYFUNC 1
147 #define HAVE_DECL_MYMACRO1 1
148 #define HAVE_DECL_MYMACRO2 1
149 #define HAVE_DECL_MYSTRUCT 1
150 #define HAVE_DECL_NO 0
151 #define HAVE_DECL_YES 1
157 # Check that it performs the correct actions:
158 # Must define HAVE_PRINTF, but not HAVE_AUTOCONF_FTNIRP
159 AT_CHECK_MACRO([AC_CHECK_FUNCS],
160 [AC_CHECK_FUNCS(printf autoconf_ftnirp)],
162 [/* #undef HAVE_AUTOCONF_FTNIRP */
163 #define HAVE_PRINTF 1
169 # Check that it performs the correct actions: autoconf_ftnirp.c must
170 # be compiled, and must define HAVE_PRINTF, but not HAVE_AUTOCONF_FTNIRP
171 # FIXME: Maybe check the traces?
172 AT_SETUP([AC_REPLACE_FUNCS])
179 [AC_CONFIG_FILES(config.libobjs:config.in)
180 AC_REPLACE_FUNCS(printf autoconf_ftnirp)])
182 AT_CHECK_AUTOCONF([-W obsolete])
187 [/* #undef HAVE_AUTOCONF_FTNIRP */
188 #define HAVE_PRINTF 1
191 AT_CHECK([sed 's/ */ /g;s/^ //;s/ $//' config.libobjs], [],
192 [${LIBOBJDIR}autoconf_ftnirp$U.o
200 # Check that it performs the correct actions:
201 # Must define HAVE_STDIO_H, but not HAVE_AUTOCONF_IO_H.
202 AT_SETUP([AC_CHECK_HEADERS])
204 AT_DATA([autoconf_io.h],
208 AT_CONFIGURE_AC([AC_CHECK_HEADERS(stdio.h autoconf_io.h)])
209 AT_CHECK_AUTOCONF([-W obsolete])
211 AT_CHECK_CONFIGURE([CPPFLAGS=-I.], [0], [ignore],
212 [configure: WARNING: autoconf_io.h: present but cannot be compiled
213 configure: WARNING: autoconf_io.h: check for missing prerequisite headers?
214 configure: WARNING: autoconf_io.h: see the Autoconf documentation
215 configure: WARNING: autoconf_io.h: section "Present But Cannot Be Compiled"
216 configure: WARNING: autoconf_io.h: proceeding with the compiler's result
220 [/* #undef HAVE_AUTOCONF_IO_H */
221 #define HAVE_STDIO_H 1
227 # AC_CHECK_HEADERS_OLD
228 # --------------------
229 # Check that it performs the correct actions:
230 # Must not check prerequisites, hence define header2.h
231 AT_SETUP([AC_CHECK_HEADERS (preprocessor test)])
241 AT_CONFIGURE_AC([AC_CHECK_HEADERS(header2.h, [], [], -)])
243 AT_CHECK_AUTOCONF([-W obsolete])
245 AT_CHECK_CONFIGURE([CPPFLAGS=-I.])
248 [#define HAVE_HEADER2_H 1
254 # AC_CHECK_HEADERS_NEW
255 # --------------------
256 # Check that it performs the correct actions:
257 # Must check prerequisites, hence define header2.h but not header3.h
258 AT_SETUP([AC_CHECK_HEADERS (compiler test)])
273 [AC_CHECK_HEADERS(header2.h header3.h, [], [], [[@%:@include "header1.h"]])])
275 AT_CHECK_AUTOCONF([-W obsolete])
277 AT_CHECK_CONFIGURE([CPPFLAGS=-I.])
280 [#define HAVE_HEADER2_H 1
281 /* #undef HAVE_HEADER3_H */
289 # Check that it performs the correct actions.
290 # Must define HAVE_STRUCT_YES_S_YES, but not HAVE_STRUCT_YES_S_NO.
291 AT_CHECK_MACRO([AC_CHECK_MEMBER],
292 [[AC_CHECK_MEMBER([struct yes_s.yes],
293 [AC_DEFINE([HAVE_STRUCT_YES_S_YES], [1],
294 [Define to 1 if `yes' is a member of `struct yes_s'.])],,
295 [struct sub { int x; };
296 struct yes_s { int yes; struct sub substruct; };])
297 AC_CHECK_MEMBER([struct yes_s.no],
298 [AC_DEFINE([HAVE_STRUCT_YES_S_NO], [1],
299 [Define to 1 if `no' is a member of `struct yes_s'.])],,
300 [struct sub { int x; };
301 struct yes_s { int yes; struct sub substruct; };])
302 AC_CHECK_MEMBER([struct yes_s.substruct],
303 [AC_DEFINE([HAVE_STRUCT_YES_S_SUBSTRUCT], [1],
304 [Define to 1 if `substruct' is a member of `struct yes_s'.])],,
305 [struct sub { int x; };
306 struct yes_s { int yes; struct sub substruct; };])]],
308 [/* #undef HAVE_STRUCT_YES_S_NO */
309 #define HAVE_STRUCT_YES_S_SUBSTRUCT 1
310 #define HAVE_STRUCT_YES_S_YES 1
315 # Check that it performs the correct actions.
316 # Must define HAVE_STRUCT_YES_S_YES, but not HAVE_STRUCT_YES_S_NO.
317 AT_CHECK_MACRO([AC_CHECK_MEMBERS],
318 [[AC_CHECK_MEMBERS([struct yes_s.yes, struct yes_s.no, struct yes_s.substruct],,,
319 [struct sub { int x; };
320 struct yes_s { int yes; struct sub substruct; };])]],
322 [/* #undef HAVE_STRUCT_YES_S_NO */
323 #define HAVE_STRUCT_YES_S_SUBSTRUCT 1
324 #define HAVE_STRUCT_YES_S_YES 1
326 AT_CHECK([grep 'yes.*member of.*yes_s' config.h], [], [ignore])
332 AT_CHECK_MACRO_CROSS([AC_CHECK_ALIGNOF],
333 [[AC_CHECK_ALIGNOF(char)
334 AC_CHECK_ALIGNOF(charchar,
335 [[#include <stddef.h>
337 typedef char charchar[2];]])
338 AC_CHECK_ALIGNOF(charcharchar)
341 [#define ALIGNOF_CHAR 1
342 #define ALIGNOF_CHARCHAR 1
343 #define ALIGNOF_CHARCHARCHAR 0
347 # AC_CHECK_ALIGNOF struct
348 # -----------------------
349 AT_CHECK_MACRO_CROSS([AC_CHECK_ALIGNOF struct],
350 [[AC_CHECK_ALIGNOF([struct { char c; }])
351 AC_CHECK_ALIGNOF([struct nosuchstruct])
353 [AT_CHECK([[grep "#define ALIGNOF_STRUCT___CHAR_C___ [1-9]" config.h]],
355 AT_CHECK([[grep "#define ALIGNOF_STRUCT_NOSUCHSTRUCT 0" config.h]],
361 AT_CHECK_MACRO_CROSS([AC_CHECK_SIZEOF],
362 [[AC_CHECK_SIZEOF(char)
363 AC_CHECK_SIZEOF(charchar,,
365 typedef char charchar[2];]])
366 AC_CHECK_SIZEOF(charcharchar)
369 [#define SIZEOF_CHAR 1
370 #define SIZEOF_CHARCHAR 2
371 #define SIZEOF_CHARCHARCHAR 0
375 # AC_CHECK_SIZEOF struct
376 # ----------------------
377 AT_CHECK_MACRO_CROSS([AC_CHECK_SIZEOF struct],
379 AC_CHECK_SIZEOF([struct x], [], [struct x { char c; int x; };])
380 AC_CHECK_SIZEOF([const struct x], [], [struct x { const char *p; int x; };])
381 AC_CHECK_SIZEOF([struct nosuchstruct])
382 # Taken from autoconf.texi:Generic Compiler Characteristics.
383 AC_CHECK_SIZEOF([int *])
385 [AT_CHECK([[grep "#define SIZEOF_STRUCT_X [1-9]" config.h]],
387 AT_CHECK([[grep "#define SIZEOF_CONST_STRUCT_X [1-9]" config.h]],
389 AT_CHECK([[grep "#define SIZEOF_STRUCT_NOSUCHSTRUCT 0" config.h]],
391 AT_CHECK([[grep "#define SIZEOF_INT_P [1-9]" config.h]],
398 # Check that it performs the correct actions.
399 # Must define HAVE_STRUCT_YES_S, HAVE_INT, but not HAVE_STRUCT_NO_S.
400 # `int' and `struct yes_s' are both checked to test both the compiler
401 # builtin types, and defined types.
402 AT_CHECK_MACRO([AC_CHECK_TYPES],
403 [[AC_CHECK_TYPES([int, struct yes_s, struct no_s],,,
404 [struct yes_s { int yes ;} ;])]],
407 /* #undef HAVE_STRUCT_NO_S */
408 #define HAVE_STRUCT_YES_S 1
414 # Check that we properly dispatch properly to the old implementation
416 AT_SETUP([AC_CHECK_TYPES: backward compatibility])
418 AT_DATA([configure.ac],
420 define([_AC_CHECK_TYPE_NEW], [NEW])
421 define([_AC_CHECK_TYPE_OLD], [OLD])
423 AC_CHECK_TYPE(ptrdiff_t)
424 AC_CHECK_TYPE(ptrdiff_t, int)
425 AC_CHECK_TYPE(quad, long long int)
426 AC_CHECK_TYPE(table_42, [int[42]])
428 AC_CHECK_TYPE(uint8_t, uint65536_t)
429 AC_CHECK_TYPE(a,b,c,d)
435 AT_CHECK([[sed -e '/^#(cut-from-here/,/^#to-here)/!d' -e '/^#/d' configure]],
450 # FIXME: To really test HAVE_AC_EXISTS2 and HAVE_AC_MISSING2 we need to
451 # open AH_TEMPLATE to `configure.ac', which is not yet the case.
452 AT_CHECK_MACRO([AC_CHECK_FILES],
453 [touch at-exists1 at-exists2
454 ac_exists2=at-exists2
455 ac_missing2=at-missing2
456 AC_CHECK_FILES(at-exists1 at-missing1 $ac_exists2 $ac_missing2)
457 rm at-exists1 at-exists2],
459 [#define HAVE_AT_EXISTS1 1
460 /* #undef HAVE_AT_MISSING1 */
465 ## ------------------------------ ##
466 ## AC_CHECK_PROG & AC_PATH_PROG. ##
467 ## ------------------------------ ##
470 # AT_CHECK_PROGS_PREPARE
471 # ----------------------
472 # Create a sub directory `path' with 6 subdirs which all 7 contain
473 # an executable `tool'. `6' contains a `better' tool.
474 m4_define([AT_CHECK_PROGS_PREPARE],
477 cat >path/tool <<\EOF
488 cp path/tool path/6/better])
491 # -------------------------------- #
492 # AC_CHECK_PROG & AC_CHECK_PROGS. #
493 # -------------------------------- #
495 AT_SETUP([AC_CHECK_PROG & AC_CHECK_PROGS])
497 AT_CHECK_PROGS_PREPARE
499 AT_DATA([configure.ac],
502 p="1${PATH_SEPARATOR}2${PATH_SEPARATOR}3${PATH_SEPARATOR}4${PATH_SEPARATOR}5${PATH_SEPARATOR}6"
503 path=`echo $p | sed -e 's,\([[0-9]]\),'"$pwd"'/path/\1,g'`
506 AC_CHECK_PROG(TOOL1, tool, found, not-found, $path)
507 test "$TOOL1" = found || fail=:
509 # Yes, the semantics of this macro is weird.
510 AC_CHECK_PROG(TOOL2, tool,, not-found, $path)
511 test "$TOOL2" = not-found || fail=:
513 AC_CHECK_PROG(TOOL3, tool, tool, not-found, $path, $pwd/path/1/tool)
514 test "$TOOL3" = "$pwd/path/2/tool" || fail=:
516 AC_CHECK_PROG(TOOL4, better, better, not-found, $path, $pwd/path/1/tool)
517 test "$TOOL4" = better || fail=:
519 # When a tool is not found, and no value is given for not-found,
520 # the variable is left empty.
521 AC_CHECK_PROGS(TOOL5, missing,, $path)
522 test -z "$TOOL5" || fail=:
524 AC_CHECK_PROGS(TOOL6, missing tool better,, $path)
525 test "$TOOL6" = tool || fail=:
527 # No AC-OUTPUT, we don't need config.status.
529 AC_MSG_ERROR([[CHECK_PROG failed]])
540 ## ---------------- ##
541 ## AC_C_BIGENDIAN. ##
542 ## ---------------- ##
544 AT_SETUP([AC_C_BIGENDIAN])
547 # Make sure that AC_C_BIGENDIAN behave the same whether we are
548 # cross-compiling or not.
555 [ac_endian=universal])
556 echo $ac_endian > at-endian
559 rm -f config.hin # So that next run of autoheader is quiet.
561 [[# Force cross compiling.
568 [ac_endian=universal])
569 ac_prevendian=`cat at-endian`
570 # Check that we have found the same result as in the previous run
571 # or unknown (because the cross-compiling check is allowed to fail;
572 # although it might be interesting to suppress this comparison, just
573 # to know on which system it fails if it ever does).
574 if test $ac_endian != $ac_prevendian && test $ac_endian != unknown; then
575 AC_MSG_ERROR([unexpected endianness: first run found '$ac_prevendian' but second run found '$ac_endian'])
579 # Make sure AC_C_BIGENDIAN with no argument will create a config.h template
580 # containing "WORDS_BIGENDIAN".
581 AT_CONFIGURE_AC([[AC_C_BIGENDIAN]])
582 # --force is necessary, the computer might be too fast.
583 AT_CHECK_AUTOHEADER([--force])
584 AT_CHECK([grep WORDS_BIGENDIAN config.hin], [], [ignore])
589 # ------------------------------ #
590 # AC_PATH_PROG & AC_PATH_PROGS. #
591 # ------------------------------ #
593 AT_SETUP([AC_PATH_PROG & AC_PATH_PROGS])
595 AT_CHECK_PROGS_PREPARE
597 AT_DATA([configure.ac],
600 p="1${PATH_SEPARATOR}2${PATH_SEPARATOR}3${PATH_SEPARATOR}4${PATH_SEPARATOR}5${PATH_SEPARATOR}6"
601 path=`echo $p | sed -e 's,\([[0-9]]\),'"$pwd"'/path/\1,g'`
604 AC_PATH_PROG(TOOL1, tool, not-found, $path)
605 test "$TOOL1" = "$pwd/path/1/tool" || fail=:
607 AC_PATH_PROG(TOOL2, better, not-found, $path)
608 test "$TOOL2" = "$pwd/path/6/better" || fail=:
610 # When a tool is not found, and no value is given for not-found,
611 # the variable is left empty.
612 AC_PATH_PROGS(TOOL3, missing,, $path)
613 test -z "$TOOL3" || fail=:
615 AC_PATH_PROGS(TOOL4, missing tool better,, $path)
616 test "$TOOL4" = "$pwd/path/1/tool" || fail=:
618 # No AC-OUTPUT, we don't need config.status.
620 AC_MSG_ERROR([[PATH_PROG failed]])
631 # ----------------------------- #
632 # AC_PATH_PROGS_FEATURE_CHECK. #
633 # ----------------------------- #
635 AT_SETUP([AC_PATH_PROGS_FEATURE_CHECK])
637 # This test doesn't work if `pwd` contains white space
639 *\ * | *\ *) AT_CHECK([exit 77]) ;;
642 AT_CHECK_PROGS_PREPARE
644 AT_DATA([configure.ac],
647 p="1${PATH_SEPARATOR}2${PATH_SEPARATOR}3${PATH_SEPARATOR}4${PATH_SEPARATOR}5${PATH_SEPARATOR}6"
648 path=`echo $p | sed -e 's,\([[0-9]]\),'"$pwd"'/path/\1,g'`
651 # Find first candidate and stop search
652 AC_PATH_PROGS_FEATURE_CHECK(TOOL1, [tool better],
653 [$ac_path_TOOL1 && ac_cv_path_TOOL1=$ac_path_TOOL1 ac_path_TOOL1_found=:],
655 test -z "$TOOL1" || fail=:
656 test "$ac_cv_path_TOOL1" = "$pwd/path/1/tool" || fail=:
658 # Keep searching each candidate
659 AC_PATH_PROGS_FEATURE_CHECK(TOOL2, [tool better],
660 [$ac_path_TOOL2 && ac_cv_path_TOOL2=$ac_path_TOOL2],
662 test "$ac_cv_path_TOOL2" = "$pwd/path/6/better" || fail=:
664 # Only accept better candidate
665 AC_PATH_PROGS_FEATURE_CHECK(TOOL3, [tool better],
666 [case "$ac_path_TOOL3" in #(
667 *better) ac_cv_path_TOOL3=$ac_path_TOOL3;;
670 test "$ac_cv_path_TOOL3" = "$pwd/path/6/better" || fail=:
672 # When a tool is not found, and no action is given for not-found,
673 # the variable is left empty.
674 AC_PATH_PROGS_FEATURE_CHECK(TOOL4, missing,
675 [ac_cv_path_TOOL4=$ac_path_TOOL4], [], $path)
676 test -z "$ac_cv_path_TOOL4" || fail=:
678 # Test action when tool is not found
679 AC_PATH_PROGS_FEATURE_CHECK(TOOL5, missing, [],
680 [ac_cv_path_TOOL5='not found'], $path)
681 test "$ac_cv_path_TOOL5" = "not found" || fail=:
683 # Test that pre-set tool bypasses feature test
684 TOOL6=$pwd/path/6/better
685 AC_PATH_PROGS_FEATURE_CHECK(TOOL6, tool, fail=:, fail=:, $path)
686 test "$ac_cv_path_TOOL6" = "$pwd/path/6/better" || fail=:
688 # A blank pre-set does not bypass feature test
690 AC_PATH_PROGS_FEATURE_CHECK(TOOL7, [tool better],
691 [$ac_path_TOOL7 && ac_cv_path_TOOL7=$ac_path_TOOL7 ac_path_TOOL7_found=:],
693 test -z "$TOOL7" || fail=:
694 test "$ac_cv_path_TOOL7" = "$pwd/path/1/tool" || fail=:
696 # No AC-OUTPUT, we don't need config.status.
698 AC_MSG_ERROR([[PATH_PROG failed]])
715 AT_SETUP([AC_PATH_XTRA])
717 _AT_CHECK_AC_MACRO([AC_PATH_XTRA])
719 # Check X_DISPLAY_MISSING.
720 AT_CHECK_CONFIGURE([--without-x])
722 [#define X_DISPLAY_MISSING 1
728 ## ------------------------------- ##
729 ## Obsolete non-updatable macros. ##
730 ## ------------------------------- ##
733 AT_CHECK_MACRO([AC_SYS_RESTARTABLE_SYSCALLS], , ,[-W no-obsolete])
734 AT_CHECK_MACRO([AC_FUNC_SETVBUF_REVERSED], , ,[-W no-obsolete])
735 AT_CHECK_MACRO([AC_FUNC_WAIT3], , ,[-W no-obsolete])