3 AT_BANNER([Semantics.])
5 # Copyright (C) 2000, 2001, 2002, 2004, 2005, 2006, 2007 Free Software
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 2, or (at your option)
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, write to the Free Software
20 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
24 ## -------------------------------- ##
25 ## Members of the AC_CHECK family. ##
26 ## -------------------------------- ##
31 # Well, I can't imagine a system where `cos' is neither in libc, nor
32 # in libm. Nor can I imagine a lib more likely to exists than libm.
33 # But there are systems without libm, on which we don't want to have
34 # this test fail, so exit successfully if `cos' is in libc.
35 AT_CHECK_MACRO([AC_CHECK_LIB],
36 [AC_TRY_LINK_FUNC(cos,
37 [AC_MSG_ERROR([`cos' is in `libc'], 77)])
40 [AC_MSG_ERROR([cannot find `cos' in `libm'])])
42 # No kidding, using variables was broken in 2.50 :(
44 AC_CHECK_LIB(m, $ac_sin,,
45 [AC_MSG_ERROR([cannot find `\$ac_sin' (= `$ac_sin') in `libm'])])
48 AC_CHECK_LIB($ac_m, acos,,
49 [AC_MSG_ERROR([cannot find `acos' in `\$ac_m' (= `$ac_m')])])
52 AC_CHECK_LIB($ac_m, $ac_asin,,
53 [AC_MSG_ERROR([cannot find `\$ac_asin' (= `$ac_asin') in `\$ac_m' (= `$at_m')])])
55 # But if the bug is in the caching mechanism, then be sure we
56 # correctly detect failures.
58 AC_CHECK_LIB(m, cossack,
59 [AC_MSG_ERROR([found `cossack' in `libm'])])
61 # No kidding, using variables was broken in 2.50 :(
63 AC_CHECK_LIB(m, $ac_sinner,
64 [AC_MSG_ERROR([found `\$ac_sinner' (= `$ac_sinner') in `libm'])])
67 AC_CHECK_LIB($ac_m, acossack,
68 [AC_MSG_ERROR([found `acossack' in `\$ac_m' (= `$ac_m')])])
71 AC_CHECK_LIB($ac_m, $ac_asinner,
72 [AC_MSG_ERROR([found `\$ac_asinner' (= `$ac_asinner') in `\$ac_m' (= `$at_m')])])
79 AT_CHECK_MACRO([AC_SEARCH_LIBS],
81 AC_SEARCH_LIBS(cos, oser m ust,,
82 [AC_MSG_ERROR([cannot find `cos'])])
84 case "$ac_cv_search_cos" in
85 -loser|-lust) AC_MSG_ERROR([jeez, $ac_cv_search_cos must be a cool library!]) ;;
90 # AC_SEARCH_LIBS (none needed)
91 # ----------------------------
92 AT_CHECK_MACRO([AC_SEARCH_LIBS (none needed)],
94 AC_SEARCH_LIBS(printf, oser c ust,,
95 [AC_MSG_ERROR([cannot find `printf'])])
97 case "$ac_cv_search_printf" in
98 -loser|-lust) AC_MSG_ERROR([jeez, $ac_cv_search_printf must be a cool library!]) ;;
99 -lc) AC_MSG_ERROR([huh, you need to give -lc?])
106 # Check that it performs the correct actions:
107 AT_CHECK_MACRO([AC_CHECK_DECLS],
108 [[AC_CHECK_DECLS([yes, no, myenum, mystruct, myfunc, mymacro1, mymacro2],,,
111 struct { int x[20]; } mystruct;
113 #define mymacro1(arg) arg
114 #define mymacro2]])]],
116 [#define HAVE_DECL_MYENUM 1
117 #define HAVE_DECL_MYFUNC 1
118 #define HAVE_DECL_MYMACRO1 1
119 #define HAVE_DECL_MYMACRO2 1
120 #define HAVE_DECL_MYSTRUCT 1
121 #define HAVE_DECL_NO 0
122 #define HAVE_DECL_YES 1
128 # Check that it performs the correct actions:
129 # Must define HAVE_PRINTF, but not HAVE_AUTOCONF_FTNIRP
130 AT_CHECK_MACRO([AC_CHECK_FUNCS],
131 [AC_CHECK_FUNCS(printf autoconf_ftnirp)],
133 [/* #undef HAVE_AUTOCONF_FTNIRP */
134 #define HAVE_PRINTF 1
140 # Check that it performs the correct actions: autoconf_ftnirp.c must
141 # be compiled, and must define HAVE_PRINTF, but not HAVE_AUTOCONF_FTNIRP
142 # FIXME: Maybe check the traces?
143 AT_SETUP([AC_REPLACE_FUNCS])
150 [AC_CONFIG_FILES(config.libobjs:config.in)
151 AC_REPLACE_FUNCS(printf autoconf_ftnirp)])
153 AT_CHECK_AUTOCONF([-W obsolete])
158 [/* #undef HAVE_AUTOCONF_FTNIRP */
159 #define HAVE_PRINTF 1
162 AT_CHECK([sed 's/ */ /g;s/^ //;s/ $//' config.libobjs], [],
163 [${LIBOBJDIR}autoconf_ftnirp$U.o
166 AT_CLEANUP([config.libobjs])
171 # Check that it performs the correct actions:
172 # Must define HAVE_STDIO_H, but not HAVE_AUTOCONF_IO_H.
173 AT_CHECK_MACRO([AC_CHECK_HEADERS],
174 [AC_CHECK_HEADERS(stdio.h autoconf_io.h)],
176 [/* #undef HAVE_AUTOCONF_IO_H */
177 #define HAVE_STDIO_H 1
181 # AC_CHECK_HEADERS_OLD
182 # --------------------
183 # Check that it performs the correct actions:
184 # Must not check prerequisites, hence define header2.h
185 AT_SETUP([AC_CHECK_HEADERS_OLD])
195 AT_CONFIGURE_AC([AC_CHECK_HEADERS(header2.h, [], [], -)])
197 AT_CHECK_AUTOCONF([-W obsolete])
199 AT_CHECK_CONFIGURE([CPPFLAGS=-I.])
202 [#define HAVE_HEADER2_H 1
205 AT_CLEANUP([header1.h header2.h])
208 # AC_CHECK_HEADERS_NEW
209 # --------------------
210 # Check that it performs the correct actions:
211 # Must check prerequisites, hence define header2.h but not header3.h
212 AT_SETUP([AC_CHECK_HEADERS_NEW])
227 [AC_CHECK_HEADERS(header2.h header3.h, [], [], [[@%:@include "header1.h"]])])
229 AT_CHECK_AUTOCONF([-W obsolete])
231 AT_CHECK_CONFIGURE([CPPFLAGS=-I.])
234 [#define HAVE_HEADER2_H 1
235 /* #undef HAVE_HEADER3_H */
238 AT_CLEANUP([header1.h header2.h header3.h])
243 # Check that it performs the correct actions.
244 # Must define HAVE_STRUCT_YES_S_YES, but not HAVE_STRUCT_YES_S_NO.
245 AT_CHECK_MACRO([AC_CHECK_MEMBERS],
246 [[AC_CHECK_MEMBERS([struct yes_s.yes, struct yes_s.no, struct yes_s.substruct],,,
247 [struct sub { int x; };
248 struct yes_s { int yes; struct sub substruct; };])]],
250 [/* #undef HAVE_STRUCT_YES_S_NO */
251 #define HAVE_STRUCT_YES_S_SUBSTRUCT 1
252 #define HAVE_STRUCT_YES_S_YES 1
258 AT_CHECK_MACRO_CROSS([AC_CHECK_ALIGNOF],
259 [[AC_CHECK_ALIGNOF(char)
260 AC_CHECK_ALIGNOF(charchar,
261 [[#include <stddef.h>
263 typedef char charchar[2];]])
264 AC_CHECK_ALIGNOF(charcharchar)
267 [#define ALIGNOF_CHAR 1
268 #define ALIGNOF_CHARCHAR 1
269 #define ALIGNOF_CHARCHARCHAR 0
273 # AC_CHECK_ALIGNOF struct
274 # -----------------------
275 AT_CHECK_MACRO_CROSS([AC_CHECK_ALIGNOF struct],
276 [[AC_CHECK_ALIGNOF([struct { char c; }])
277 AC_CHECK_ALIGNOF([struct nosuchstruct])
279 [AT_CHECK([[grep "#define ALIGNOF_STRUCT___CHAR_C___ [^0]" config.h]],
281 AT_CHECK([[grep "#define ALIGNOF_STRUCT_NOSUCHSTRUCT 0" config.h]],
287 AT_CHECK_MACRO_CROSS([AC_CHECK_SIZEOF],
288 [[AC_CHECK_SIZEOF(char)
289 AC_CHECK_SIZEOF(charchar,,
291 typedef char charchar[2];]])
292 AC_CHECK_SIZEOF(charcharchar)
295 [#define SIZEOF_CHAR 1
296 #define SIZEOF_CHARCHAR 2
297 #define SIZEOF_CHARCHARCHAR 0
301 # AC_CHECK_SIZEOF struct
302 # ----------------------
303 AT_CHECK_MACRO_CROSS([AC_CHECK_SIZEOF struct],
305 AC_CHECK_SIZEOF([struct { char c; int x; }])
306 AC_CHECK_SIZEOF([const struct { const char *p; int x; }])
307 AC_CHECK_SIZEOF([struct nosuchstruct])
309 [AT_CHECK([[grep "#define SIZEOF_STRUCT___CHAR_C__INT_X___ [^0]" config.h]],
311 AT_CHECK([[grep "#define SIZEOF_CONST_STRUCT___CONST_CHAR_PP__INT_X___ [^0]" config.h]],
313 AT_CHECK([[grep "#define SIZEOF_STRUCT_NOSUCHSTRUCT 0" config.h]],
320 # Check that it performs the correct actions.
321 # Must define HAVE_STRUCT_YES_S, HAVE_INT, but not HAVE_STRUCT_NO_S.
322 # `int' and `struct yes_s' are both checked to test both the compiler
323 # builtin types, and defined types.
324 AT_CHECK_MACRO([AC_CHECK_TYPES],
325 [[AC_CHECK_TYPES([int, struct yes_s, struct no_s],,,
326 [struct yes_s { int yes ;} ;])]],
329 /* #undef HAVE_STRUCT_NO_S */
330 #define HAVE_STRUCT_YES_S 1
336 # Check that we properly dispatch properly to the old implementation
338 AT_SETUP([AC_CHECK_TYPES: backward compatibility])
340 AT_DATA([configure.ac],
342 define([_AC_CHECK_TYPE_NEW], [NEW])
343 define([_AC_CHECK_TYPE_OLD], [OLD])
345 AC_CHECK_TYPE(ptrdiff_t)
346 AC_CHECK_TYPE(ptrdiff_t, int)
347 AC_CHECK_TYPE(quad, long long int)
348 AC_CHECK_TYPE(table_42, [int[42]])
350 AC_CHECK_TYPE(uint8_t, uint65536_t)
351 AC_CHECK_TYPE(a,b,c,d)
357 AT_CHECK([[sed -e '/^#(cut-from-here/,/^#to-here)/!d' -e '/^#/d' configure]],
372 # FIXME: To really test HAVE_AC_EXISTS2 and HAVE_AC_MISSING2 we need to
373 # open AH_TEMPLATE to `configure.ac', which is not yet the case.
374 AT_CHECK_MACRO([AC_CHECK_FILES],
375 [touch at-exists1 at-exists2
376 ac_exists2=at-exists2
377 ac_missing2=at-missing2
378 AC_CHECK_FILES(at-exists1 at-missing1 $ac_exists2 $ac_missing2)
379 rm at-exists1 at-exists2],
381 [#define HAVE_AT_EXISTS1 1
382 /* #undef HAVE_AT_MISSING1 */
387 ## ------------------------------ ##
388 ## AC_CHECK_PROG & AC_PATH_PROG. ##
389 ## ------------------------------ ##
392 # AT_CHECK_PROGS_PREPARE
393 # ----------------------
394 # Create a sub directory `path' with 6 subdirs which all 7 contain
395 # an executable `tool'. `6' contains a `better' tool.
396 m4_define([AT_CHECK_PROGS_PREPARE],
399 cat >path/tool <<\EOF
410 cp path/tool path/6/better])
413 # -------------------------------- #
414 # AC_CHECK_PROG & AC_CHECK_PROGS. #
415 # -------------------------------- #
417 AT_SETUP([AC_CHECK_PROG & AC_CHECK_PROGS])
419 AT_CHECK_PROGS_PREPARE
421 AT_DATA([configure.ac],
424 p="1${PATH_SEPARATOR}2${PATH_SEPARATOR}3${PATH_SEPARATOR}4${PATH_SEPARATOR}5${PATH_SEPARATOR}6"
425 path=`echo $p | sed -e 's,\([[0-9]]\),'"$pwd"'/path/\1,g'`
428 AC_CHECK_PROG(TOOL1, tool, found, not-found, $path)
429 test "$TOOL1" = found || fail=:
431 # Yes, the semantics of this macro is weird.
432 AC_CHECK_PROG(TOOL2, tool,, not-found, $path)
433 test "$TOOL2" = not-found || fail=:
435 AC_CHECK_PROG(TOOL3, tool, tool, not-found, $path, $pwd/path/1/tool)
436 test "$TOOL3" = "$pwd/path/2/tool" || fail=:
438 AC_CHECK_PROG(TOOL4, better, better, not-found, $path, $pwd/path/1/tool)
439 test "$TOOL4" = better || fail=:
441 # When a tool is not found, and no value is given for not-found,
442 # the variable is left empty.
443 AC_CHECK_PROGS(TOOL5, missing,, $path)
444 test -z "$TOOL5" || fail=:
446 AC_CHECK_PROGS(TOOL6, missing tool better,, $path)
447 test "$TOOL6" = tool || fail=:
449 # No AC-OUTPUT, we don't need config.status.
451 AC_MSG_ERROR([[CHECK_PROG failed]])
462 ## ---------------- ##
463 ## AC_C_BIGENDIAN. ##
464 ## ---------------- ##
466 AT_SETUP([AC_C_BIGENDIAN])
469 # Make sure that AC_C_BIGENDIAN behave the same whether we are
470 # cross-compiling or not.
477 [ac_endian=universal])
478 echo $ac_endian > at-endian
481 rm -f config.hin # So that next run of autoheader is quiet.
483 [[# Force cross compiling.
490 [ac_endian=universal])
491 ac_prevendian=`cat at-endian`
492 # Check that we have found the same result as in the previous run
493 # or unknown (because the cross-compiling check is allowed to fail;
494 # although it might be interesting to suppress this comparison, just
495 # to know on which system it fails if it ever does).
496 if test $ac_endian != $ac_prevendian && test $ac_endian != unknown; then
497 AC_MSG_ERROR([unexpected endianness: first run found '$ac_prevendian' but second run found '$ac_endian'])
501 # Make sure AC_C_BIGENDIAN with no argument will create a config.h template
502 # containing "WORDS_BIGENDIAN".
503 AT_CONFIGURE_AC([[AC_C_BIGENDIAN]])
504 # --force is necessary, the computer might be too fast.
505 AT_CHECK_AUTOHEADER([--force])
506 AT_CHECK([grep WORDS_BIGENDIAN config.hin], [], [ignore])
508 AT_CLEANUP(at-endian)
511 # ------------------------------ #
512 # AC_PATH_PROG & AC_PATH_PROGS. #
513 # ------------------------------ #
515 AT_SETUP([AC_PATH_PROG & AC_PATH_PROGS])
517 AT_CHECK_PROGS_PREPARE
519 AT_DATA([configure.ac],
522 p="1${PATH_SEPARATOR}2${PATH_SEPARATOR}3${PATH_SEPARATOR}4${PATH_SEPARATOR}5${PATH_SEPARATOR}6"
523 path=`echo $p | sed -e 's,\([[0-9]]\),'"$pwd"'/path/\1,g'`
526 AC_PATH_PROG(TOOL1, tool, not-found, $path)
527 test "$TOOL1" = "$pwd/path/1/tool" || fail=:
529 AC_PATH_PROG(TOOL2, better, not-found, $path)
530 test "$TOOL2" = "$pwd/path/6/better" || fail=:
532 # When a tool is not found, and no value is given for not-found,
533 # the variable is left empty.
534 AC_PATH_PROGS(TOOL3, missing,, $path)
535 test -z "$TOOL3" || fail=:
537 AC_PATH_PROGS(TOOL4, missing tool better,, $path)
538 test "$TOOL4" = "$pwd/path/1/tool" || fail=:
540 # No AC-OUTPUT, we don't need config.status.
542 AC_MSG_ERROR([[PATH_PROG failed]])
559 AT_SETUP([AC_PATH_XTRA])
561 _AT_CHECK_AC_MACRO([AC_PATH_XTRA])
563 # Check X_DISPLAY_MISSING.
564 AT_CHECK_CONFIGURE([--without-x])
566 [#define X_DISPLAY_MISSING 1
572 ## ------------------------------- ##
573 ## Obsolete non-updatable macros. ##
574 ## ------------------------------- ##
577 AT_CHECK_MACRO([AC_SYS_RESTARTABLE_SYSCALLS], , ,[-W no-obsolete])
578 AT_CHECK_MACRO([AC_FUNC_SETVBUF_REVERSED], , ,[-W no-obsolete])
579 AT_CHECK_MACRO([AC_FUNC_WAIT3], , ,[-W no-obsolete])