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
112 #define mymacro2]])]],
114 [#define HAVE_DECL_MYENUM 1
115 #define HAVE_DECL_MYFUNC 1
116 #define HAVE_DECL_MYMACRO1 1
117 #define HAVE_DECL_MYMACRO2 1
118 #define HAVE_DECL_MYSTRUCT 1
119 #define HAVE_DECL_NO 0
120 #define HAVE_DECL_YES 1
126 # Check that it performs the correct actions:
127 # Must define HAVE_PRINTF, but not HAVE_AUTOCONF_FTNIRP
128 AT_CHECK_MACRO([AC_CHECK_FUNCS],
129 [AC_CHECK_FUNCS(printf autoconf_ftnirp)],
131 [/* #undef HAVE_AUTOCONF_FTNIRP */
132 #define HAVE_PRINTF 1
138 # Check that it performs the correct actions: autoconf_ftnirp.c must
139 # be compiled, and must define HAVE_PRINTF, but not HAVE_AUTOCONF_FTNIRP
140 # FIXME: Maybe check the traces?
141 AT_SETUP([AC_REPLACE_FUNCS])
148 [AC_CONFIG_FILES(config.libobjs:config.in)
149 AC_REPLACE_FUNCS(printf autoconf_ftnirp)])
151 AT_CHECK_AUTOCONF([-W obsolete])
156 [/* #undef HAVE_AUTOCONF_FTNIRP */
157 #define HAVE_PRINTF 1
160 AT_CHECK([sed 's/ */ /g;s/^ //;s/ $//' config.libobjs], [],
161 [${LIBOBJDIR}autoconf_ftnirp$U.o
169 # Check that it performs the correct actions:
170 # Must define HAVE_STDIO_H, but not HAVE_AUTOCONF_IO_H.
171 AT_SETUP([AC_CHECK_HEADERS])
173 AT_DATA([autoconf_io.h],
177 AT_CONFIGURE_AC([AC_CHECK_HEADERS(stdio.h autoconf_io.h)])
178 AT_CHECK_AUTOCONF([-W obsolete])
180 AT_CHECK_CONFIGURE([CPPFLAGS=-I.], [0], [ignore],
181 [configure: WARNING: autoconf_io.h: present but cannot be compiled
182 configure: WARNING: autoconf_io.h: check for missing prerequisite headers?
183 configure: WARNING: autoconf_io.h: see the Autoconf documentation
184 configure: WARNING: autoconf_io.h: section "Present But Cannot Be Compiled"
185 configure: WARNING: autoconf_io.h: proceeding with the compiler's result
189 [/* #undef HAVE_AUTOCONF_IO_H */
190 #define HAVE_STDIO_H 1
196 # AC_CHECK_HEADERS_OLD
197 # --------------------
198 # Check that it performs the correct actions:
199 # Must not check prerequisites, hence define header2.h
200 AT_SETUP([AC_CHECK_HEADERS (preprocessor test)])
210 AT_CONFIGURE_AC([AC_CHECK_HEADERS(header2.h, [], [], -)])
212 AT_CHECK_AUTOCONF([-W obsolete])
214 AT_CHECK_CONFIGURE([CPPFLAGS=-I.])
217 [#define HAVE_HEADER2_H 1
223 # AC_CHECK_HEADERS_NEW
224 # --------------------
225 # Check that it performs the correct actions:
226 # Must check prerequisites, hence define header2.h but not header3.h
227 AT_SETUP([AC_CHECK_HEADERS (compiler test)])
242 [AC_CHECK_HEADERS(header2.h header3.h, [], [], [[@%:@include "header1.h"]])])
244 AT_CHECK_AUTOCONF([-W obsolete])
246 AT_CHECK_CONFIGURE([CPPFLAGS=-I.])
249 [#define HAVE_HEADER2_H 1
250 /* #undef HAVE_HEADER3_H */
258 # Check that it performs the correct actions.
259 # Must define HAVE_STRUCT_YES_S_YES, but not HAVE_STRUCT_YES_S_NO.
260 AT_CHECK_MACRO([AC_CHECK_MEMBER],
261 [[AC_CHECK_MEMBER([struct yes_s.yes],
262 [AC_DEFINE([HAVE_STRUCT_YES_S_YES], [1],
263 [Define to 1 if `yes' is a member of `struct yes_s'.])],,
264 [struct sub { int x; };
265 struct yes_s { int yes; struct sub substruct; };])
266 AC_CHECK_MEMBER([struct yes_s.no],
267 [AC_DEFINE([HAVE_STRUCT_YES_S_NO], [1],
268 [Define to 1 if `no' is a member of `struct yes_s'.])],,
269 [struct sub { int x; };
270 struct yes_s { int yes; struct sub substruct; };])
271 AC_CHECK_MEMBER([struct yes_s.substruct],
272 [AC_DEFINE([HAVE_STRUCT_YES_S_SUBSTRUCT], [1],
273 [Define to 1 if `substruct' is a member of `struct yes_s'.])],,
274 [struct sub { int x; };
275 struct yes_s { int yes; struct sub substruct; };])]],
277 [/* #undef HAVE_STRUCT_YES_S_NO */
278 #define HAVE_STRUCT_YES_S_SUBSTRUCT 1
279 #define HAVE_STRUCT_YES_S_YES 1
284 # Check that it performs the correct actions.
285 # Must define HAVE_STRUCT_YES_S_YES, but not HAVE_STRUCT_YES_S_NO.
286 AT_CHECK_MACRO([AC_CHECK_MEMBERS],
287 [[AC_CHECK_MEMBERS([struct yes_s.yes, struct yes_s.no, struct yes_s.substruct],,,
288 [struct sub { int x; };
289 struct yes_s { int yes; struct sub substruct; };])]],
291 [/* #undef HAVE_STRUCT_YES_S_NO */
292 #define HAVE_STRUCT_YES_S_SUBSTRUCT 1
293 #define HAVE_STRUCT_YES_S_YES 1
295 AT_CHECK([grep 'yes.*member of.*yes_s' config.h], [], [ignore])
301 AT_CHECK_MACRO_CROSS([AC_CHECK_ALIGNOF],
302 [[AC_CHECK_ALIGNOF(char)
303 AC_CHECK_ALIGNOF(charchar,
304 [[#include <stddef.h>
306 typedef char charchar[2];]])
307 AC_CHECK_ALIGNOF(charcharchar)
310 [#define ALIGNOF_CHAR 1
311 #define ALIGNOF_CHARCHAR 1
312 #define ALIGNOF_CHARCHARCHAR 0
316 # AC_CHECK_ALIGNOF struct
317 # -----------------------
318 AT_CHECK_MACRO_CROSS([AC_CHECK_ALIGNOF struct],
319 [[AC_CHECK_ALIGNOF([struct { char c; }])
320 AC_CHECK_ALIGNOF([struct nosuchstruct])
322 [AT_CHECK([[grep "#define ALIGNOF_STRUCT___CHAR_C___ [^0]" config.h]],
324 AT_CHECK([[grep "#define ALIGNOF_STRUCT_NOSUCHSTRUCT 0" config.h]],
330 AT_CHECK_MACRO_CROSS([AC_CHECK_SIZEOF],
331 [[AC_CHECK_SIZEOF(char)
332 AC_CHECK_SIZEOF(charchar,,
334 typedef char charchar[2];]])
335 AC_CHECK_SIZEOF(charcharchar)
338 [#define SIZEOF_CHAR 1
339 #define SIZEOF_CHARCHAR 2
340 #define SIZEOF_CHARCHARCHAR 0
344 # AC_CHECK_SIZEOF struct
345 # ----------------------
346 AT_CHECK_MACRO_CROSS([AC_CHECK_SIZEOF struct],
348 AC_CHECK_SIZEOF([struct x], [], [struct x { char c; int x; };])
349 AC_CHECK_SIZEOF([const struct x], [], [struct x { const char *p; int x; };])
350 AC_CHECK_SIZEOF([struct nosuchstruct])
352 [AT_CHECK([[grep "#define SIZEOF_STRUCT_X [^0]" config.h]],
354 AT_CHECK([[grep "#define SIZEOF_CONST_STRUCT_X [^0]" config.h]],
356 AT_CHECK([[grep "#define SIZEOF_STRUCT_NOSUCHSTRUCT 0" config.h]],
363 # Check that it performs the correct actions.
364 # Must define HAVE_STRUCT_YES_S, HAVE_INT, but not HAVE_STRUCT_NO_S.
365 # `int' and `struct yes_s' are both checked to test both the compiler
366 # builtin types, and defined types.
367 AT_CHECK_MACRO([AC_CHECK_TYPES],
368 [[AC_CHECK_TYPES([int, struct yes_s, struct no_s],,,
369 [struct yes_s { int yes ;} ;])]],
372 /* #undef HAVE_STRUCT_NO_S */
373 #define HAVE_STRUCT_YES_S 1
379 # Check that we properly dispatch properly to the old implementation
381 AT_SETUP([AC_CHECK_TYPES: backward compatibility])
383 AT_DATA([configure.ac],
385 define([_AC_CHECK_TYPE_NEW], [NEW])
386 define([_AC_CHECK_TYPE_OLD], [OLD])
388 AC_CHECK_TYPE(ptrdiff_t)
389 AC_CHECK_TYPE(ptrdiff_t, int)
390 AC_CHECK_TYPE(quad, long long int)
391 AC_CHECK_TYPE(table_42, [int[42]])
393 AC_CHECK_TYPE(uint8_t, uint65536_t)
394 AC_CHECK_TYPE(a,b,c,d)
400 AT_CHECK([[sed -e '/^#(cut-from-here/,/^#to-here)/!d' -e '/^#/d' configure]],
415 # FIXME: To really test HAVE_AC_EXISTS2 and HAVE_AC_MISSING2 we need to
416 # open AH_TEMPLATE to `configure.ac', which is not yet the case.
417 AT_CHECK_MACRO([AC_CHECK_FILES],
418 [touch at-exists1 at-exists2
419 ac_exists2=at-exists2
420 ac_missing2=at-missing2
421 AC_CHECK_FILES(at-exists1 at-missing1 $ac_exists2 $ac_missing2)
422 rm at-exists1 at-exists2],
424 [#define HAVE_AT_EXISTS1 1
425 /* #undef HAVE_AT_MISSING1 */
430 ## ------------------------------ ##
431 ## AC_CHECK_PROG & AC_PATH_PROG. ##
432 ## ------------------------------ ##
435 # AT_CHECK_PROGS_PREPARE
436 # ----------------------
437 # Create a sub directory `path' with 6 subdirs which all 7 contain
438 # an executable `tool'. `6' contains a `better' tool.
439 m4_define([AT_CHECK_PROGS_PREPARE],
442 cat >path/tool <<\EOF
453 cp path/tool path/6/better])
456 # -------------------------------- #
457 # AC_CHECK_PROG & AC_CHECK_PROGS. #
458 # -------------------------------- #
460 AT_SETUP([AC_CHECK_PROG & AC_CHECK_PROGS])
462 AT_CHECK_PROGS_PREPARE
464 AT_DATA([configure.ac],
467 p="1${PATH_SEPARATOR}2${PATH_SEPARATOR}3${PATH_SEPARATOR}4${PATH_SEPARATOR}5${PATH_SEPARATOR}6"
468 path=`echo $p | sed -e 's,\([[0-9]]\),'"$pwd"'/path/\1,g'`
471 AC_CHECK_PROG(TOOL1, tool, found, not-found, $path)
472 test "$TOOL1" = found || fail=:
474 # Yes, the semantics of this macro is weird.
475 AC_CHECK_PROG(TOOL2, tool,, not-found, $path)
476 test "$TOOL2" = not-found || fail=:
478 AC_CHECK_PROG(TOOL3, tool, tool, not-found, $path, $pwd/path/1/tool)
479 test "$TOOL3" = "$pwd/path/2/tool" || fail=:
481 AC_CHECK_PROG(TOOL4, better, better, not-found, $path, $pwd/path/1/tool)
482 test "$TOOL4" = better || fail=:
484 # When a tool is not found, and no value is given for not-found,
485 # the variable is left empty.
486 AC_CHECK_PROGS(TOOL5, missing,, $path)
487 test -z "$TOOL5" || fail=:
489 AC_CHECK_PROGS(TOOL6, missing tool better,, $path)
490 test "$TOOL6" = tool || fail=:
492 # No AC-OUTPUT, we don't need config.status.
494 AC_MSG_ERROR([[CHECK_PROG failed]])
505 ## ---------------- ##
506 ## AC_C_BIGENDIAN. ##
507 ## ---------------- ##
509 AT_SETUP([AC_C_BIGENDIAN])
512 # Make sure that AC_C_BIGENDIAN behave the same whether we are
513 # cross-compiling or not.
520 [ac_endian=universal])
521 echo $ac_endian > at-endian
524 rm -f config.hin # So that next run of autoheader is quiet.
526 [[# Force cross compiling.
533 [ac_endian=universal])
534 ac_prevendian=`cat at-endian`
535 # Check that we have found the same result as in the previous run
536 # or unknown (because the cross-compiling check is allowed to fail;
537 # although it might be interesting to suppress this comparison, just
538 # to know on which system it fails if it ever does).
539 if test $ac_endian != $ac_prevendian && test $ac_endian != unknown; then
540 AC_MSG_ERROR([unexpected endianness: first run found '$ac_prevendian' but second run found '$ac_endian'])
544 # Make sure AC_C_BIGENDIAN with no argument will create a config.h template
545 # containing "WORDS_BIGENDIAN".
546 AT_CONFIGURE_AC([[AC_C_BIGENDIAN]])
547 # --force is necessary, the computer might be too fast.
548 AT_CHECK_AUTOHEADER([--force])
549 AT_CHECK([grep WORDS_BIGENDIAN config.hin], [], [ignore])
554 # ------------------------------ #
555 # AC_PATH_PROG & AC_PATH_PROGS. #
556 # ------------------------------ #
558 AT_SETUP([AC_PATH_PROG & AC_PATH_PROGS])
560 AT_CHECK_PROGS_PREPARE
562 AT_DATA([configure.ac],
565 p="1${PATH_SEPARATOR}2${PATH_SEPARATOR}3${PATH_SEPARATOR}4${PATH_SEPARATOR}5${PATH_SEPARATOR}6"
566 path=`echo $p | sed -e 's,\([[0-9]]\),'"$pwd"'/path/\1,g'`
569 AC_PATH_PROG(TOOL1, tool, not-found, $path)
570 test "$TOOL1" = "$pwd/path/1/tool" || fail=:
572 AC_PATH_PROG(TOOL2, better, not-found, $path)
573 test "$TOOL2" = "$pwd/path/6/better" || fail=:
575 # When a tool is not found, and no value is given for not-found,
576 # the variable is left empty.
577 AC_PATH_PROGS(TOOL3, missing,, $path)
578 test -z "$TOOL3" || fail=:
580 AC_PATH_PROGS(TOOL4, missing tool better,, $path)
581 test "$TOOL4" = "$pwd/path/1/tool" || fail=:
583 # No AC-OUTPUT, we don't need config.status.
585 AC_MSG_ERROR([[PATH_PROG failed]])
596 # ----------------------------- #
597 # AC_PATH_PROGS_FEATURE_CHECK. #
598 # ----------------------------- #
600 AT_SETUP([AC_PATH_PROGS_FEATURE_CHECK])
602 # This test doesn't work if `pwd` contains white space
604 *\ * | *\ *) AT_CHECK([exit 77]) ;;
607 AT_CHECK_PROGS_PREPARE
609 AT_DATA([configure.ac],
612 p="1${PATH_SEPARATOR}2${PATH_SEPARATOR}3${PATH_SEPARATOR}4${PATH_SEPARATOR}5${PATH_SEPARATOR}6"
613 path=`echo $p | sed -e 's,\([[0-9]]\),'"$pwd"'/path/\1,g'`
616 # Find first candidate and stop search
617 AC_PATH_PROGS_FEATURE_CHECK(TOOL1, [tool better],
618 [$ac_path_TOOL1 && ac_cv_path_TOOL1=$ac_path_TOOL1 ac_path_TOOL1_found=:],
620 test -z "$TOOL1" || fail=:
621 test "$ac_cv_path_TOOL1" = "$pwd/path/1/tool" || fail=:
623 # Keep searching each candidate
624 AC_PATH_PROGS_FEATURE_CHECK(TOOL2, [tool better],
625 [$ac_path_TOOL2 && ac_cv_path_TOOL2=$ac_path_TOOL2],
627 test "$ac_cv_path_TOOL2" = "$pwd/path/6/better" || fail=:
629 # Only accept better candidate
630 AC_PATH_PROGS_FEATURE_CHECK(TOOL3, [tool better],
631 [case "$ac_path_TOOL3" in #(
632 *better) ac_cv_path_TOOL3=$ac_path_TOOL3;;
635 test "$ac_cv_path_TOOL3" = "$pwd/path/6/better" || fail=:
637 # When a tool is not found, and no action is given for not-found,
638 # the variable is left empty.
639 AC_PATH_PROGS_FEATURE_CHECK(TOOL4, missing,
640 [ac_cv_path_TOOL4=$ac_path_TOOL4], [], $path)
641 test -z "$ac_cv_path_TOOL4" || fail=:
643 # Test action when tool is not found
644 AC_PATH_PROGS_FEATURE_CHECK(TOOL5, missing, [],
645 [ac_cv_path_TOOL5='not found'], $path)
646 test "$ac_cv_path_TOOL5" = "not found" || fail=:
648 # Test that pre-set tool bypasses feature test
649 TOOL6=$pwd/path/6/better
650 AC_PATH_PROGS_FEATURE_CHECK(TOOL6, tool, fail=:, fail=:, $path)
651 test "$ac_cv_path_TOOL6" = "$pwd/path/6/better" || fail=:
653 # A blank pre-set does not bypass feature test
655 AC_PATH_PROGS_FEATURE_CHECK(TOOL7, [tool better],
656 [$ac_path_TOOL7 && ac_cv_path_TOOL7=$ac_path_TOOL7 ac_path_TOOL7_found=:],
658 test -z "$TOOL7" || fail=:
659 test "$ac_cv_path_TOOL7" = "$pwd/path/1/tool" || fail=:
661 # No AC-OUTPUT, we don't need config.status.
663 AC_MSG_ERROR([[PATH_PROG failed]])
680 AT_SETUP([AC_PATH_XTRA])
682 _AT_CHECK_AC_MACRO([AC_PATH_XTRA])
684 # Check X_DISPLAY_MISSING.
685 AT_CHECK_CONFIGURE([--without-x])
687 [#define X_DISPLAY_MISSING 1
693 ## ------------------------------- ##
694 ## Obsolete non-updatable macros. ##
695 ## ------------------------------- ##
698 AT_CHECK_MACRO([AC_SYS_RESTARTABLE_SYSCALLS], , ,[-W no-obsolete])
699 AT_CHECK_MACRO([AC_FUNC_SETVBUF_REVERSED], , ,[-W no-obsolete])
700 AT_CHECK_MACRO([AC_FUNC_WAIT3], , ,[-W no-obsolete])