aboutsummaryrefslogtreecommitdiff
path: root/libgfortran/acinclude.m4
blob: 73d67e18784971e0ac3ed251230cc0b5fb40cc2e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
m4_include(../config/acx.m4)
m4_include(../config/no-executables.m4)

dnl Check:
dnl * If we have gettimeofday;
dnl * If we have struct timezone for use in calling it;
dnl * If calling it with a timezone pointer actually works -- this is deemed
dnl   obsolete or undefined on some systems which say you should use a null
dnl   pointer -- and undefine HAVE_TIMEZONE if so;
dnl * Whether it only takes one arg.
AC_DEFUN([LIBGFOR_GETTIMEOFDAY], [
  AC_CHECK_FUNCS(gettimeofday)
  if test "$ac_cv_func_gettimeofday" = yes; then
    AC_CACHE_CHECK([for struct timezone], gfor_cv_struct_timezone,
      [AC_TRY_COMPILE([#include <sys/time.h>],
      [struct timezone tz;],
      gfor_cv_struct_timezone=yes, gfor_cv_struct_timezone=no)])
    if test $gfor_cv_struct_timezone = yes; then
      dnl It may be that we can't call gettimeofday with a non-null pointer.
      dnl In that case we'll lie about struct timezone.
      AC_TRY_RUN([
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
main ()
{
  struct timeval time;
  struct timezone dummy;
  if (gettimeofday (&time, &dummy))
    exit (1);
  else
    exit (0);
}],
        [gfor_have_struct_timezone=yes], [gfor_have_struct_timezone=no],
        [gfor_have_struct_timezone=yes])
      if test $gfor_have_struct_timezone = yes; then
        AC_DEFINE(HAVE_TIMEZONE, 1, [Do we have struct timezone])
      fi
    fi
    AC_REQUIRE([AC_HEADER_TIME])
    AC_CACHE_CHECK([whether gettimeofday can accept two arguments],
      emacs_cv_gettimeofday_two_arguments,
      [AC_TRY_LINK([
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
      ],
      [
      struct timeval time;
#ifdef HAVE_TIMEZONE
      struct timezone dummy;
#define DUMMY &dummy
#else
#define DUMMY NULL
#endif
      gettimeofday (&time, DUMMY);],
      emacs_cv_gettimeofday_two_arguments=yes,
      emacs_cv_gettimeofday_two_arguments=no)])
    if test $emacs_cv_gettimeofday_two_arguments = no; then
      AC_DEFINE(GETTIMEOFDAY_ONE_ARGUMENT, 1,
        [Does gettimeofday take a single argument])
    fi
  fi])

sinclude(../libtool.m4)
dnl The lines below arrange for aclocal not to bring an installed
dnl libtool.m4 into aclocal.m4, while still arranging for automake to
dnl add a definition of LIBTOOL to Makefile.in.
ifelse(,,,[AC_SUBST(LIBTOOL)
AC_DEFUN([AM_PROG_LIBTOOL])
AC_DEFUN([AC_LIBTOOL_DLOPEN])
AC_DEFUN([AC_PROG_LD])
])

dnl Check whether the target is ILP32.
AC_DEFUN([LIBGFOR_TARGET_ILP32], [
  AC_CACHE_CHECK([whether the target is ILP32], target_ilp32, [
  save_CFLAGS="$CFLAGS"
  CFLAGS="-O2"
  AC_TRY_LINK(,[
if (sizeof(int) == 4 && sizeof(long) == 4 && sizeof(void *) == 4)
  ;
else
  undefined_function ();
               ],
               target_ilp32=yes,
               target_ilp32=no)
  CFLAGS="$save_CFLAGS"])
  if test $target_ilp32 = yes; then
    AC_DEFINE(TARGET_ILP32, 1,
      [Define to 1 if the target is ILP32.])
  fi
  ])

dnl Check whether the target supports hidden visibility.
AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_VISIBILITY], [
  AC_CACHE_CHECK([whether the target supports hidden visibility],
		 have_attribute_visibility, [
  save_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -Werror"
  AC_TRY_COMPILE([void __attribute__((visibility("hidden"))) foo(void) { }],
		 [], have_attribute_visibility=yes,
		 have_attribute_visibility=no)
  CFLAGS="$save_CFLAGS"])
  if test $have_attribute_visibility = yes; then
    AC_DEFINE(HAVE_ATTRIBUTE_VISIBILITY, 1,
      [Define to 1 if the target supports __attribute__((visibility(...))).])
  fi])

dnl Check whether the target supports dllexport
AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_DLLEXPORT], [
  AC_CACHE_CHECK([whether the target supports dllexport],
		 have_attribute_dllexport, [
  save_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -Werror"
  AC_TRY_COMPILE([void __attribute__((dllexport)) foo(void) { }],
		 [], have_attribute_dllexport=yes,
		 have_attribute_dllexport=no)
  CFLAGS="$save_CFLAGS"])
  if test $have_attribute_dllexport = yes; then
    AC_DEFINE(HAVE_ATTRIBUTE_DLLEXPORT, 1,
      [Define to 1 if the target supports __attribute__((dllexport)).])
  fi])

dnl Check whether the target supports symbol aliases.
AC_DEFUN([LIBGFOR_CHECK_ATTRIBUTE_ALIAS], [
  AC_CACHE_CHECK([whether the target supports symbol aliases],
		 have_attribute_alias, [
  AC_TRY_LINK([
void foo(void) { }
extern void bar(void) __attribute__((alias("foo")));],
    [bar();], have_attribute_alias=yes, have_attribute_alias=no)])
  if test $have_attribute_alias = yes; then
    AC_DEFINE(HAVE_ATTRIBUTE_ALIAS, 1,
      [Define to 1 if the target supports __attribute__((alias(...))).])
  fi])

dnl Check whether the target supports __sync_fetch_and_add.
AC_DEFUN([LIBGFOR_CHECK_SYNC_FETCH_AND_ADD], [
  AC_CACHE_CHECK([whether the target supports __sync_fetch_and_add],
		 have_sync_fetch_and_add, [
  AC_TRY_LINK([int foovar = 0;], [
if (foovar <= 0) return __sync_fetch_and_add (&foovar, 1);
if (foovar > 10) return __sync_add_and_fetch (&foovar, -1);],
	      have_sync_fetch_and_add=yes, have_sync_fetch_and_add=no)])
  if test $have_sync_fetch_and_add = yes; then
    AC_DEFINE(HAVE_SYNC_FETCH_AND_ADD, 1,
	      [Define to 1 if the target supports __sync_fetch_and_add])
  fi])

dnl Check if threads are supported.
AC_DEFUN([LIBGFOR_CHECK_GTHR_DEFAULT], [
  AC_CACHE_CHECK([configured target thread model],
		 target_thread_file, [
target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`])

  if test $target_thread_file != single; then
    AC_DEFINE(HAVE_GTHR_DEFAULT, 1,
	      [Define if the compiler has a thread header that is non single.])
  fi])

dnl Check for pragma weak.
AC_DEFUN([LIBGFOR_GTHREAD_WEAK], [
  AC_CACHE_CHECK([whether pragma weak works],
		 have_pragma_weak, [
  gfor_save_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -Wunknown-pragmas"
  AC_TRY_COMPILE([void foo (void);
#pragma weak foo], [if (foo) foo ();],
		 have_pragma_weak=yes, have_pragma_weak=no)])
  if test $have_pragma_weak = yes; then
    AC_DEFINE(SUPPORTS_WEAK, 1,
	      [Define to 1 if the target supports #pragma weak])
  fi
  case "$host" in
    *-*-darwin* | *-*-hpux* | *-*-cygwin*)
      AC_DEFINE(GTHREAD_USE_WEAK, 0,
		[Define to 0 if the target shouldn't use #pragma weak])
      ;;
  esac])

dnl Check whether target can unlink a file still open.
AC_DEFUN([LIBGFOR_CHECK_UNLINK_OPEN_FILE], [
  AC_CACHE_CHECK([whether the target can unlink an open file],
                  have_unlink_open_file, [
  AC_TRY_RUN([
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/stat.h>

int main ()
{
  int fd;

  fd = open ("testfile", O_RDWR | O_CREAT, S_IWRITE | S_IREAD);
  if (fd <= 0)
    return 0;
  if (unlink ("testfile") == -1)
    return 1;
  write (fd, "This is a test\n", 15);
  close (fd);

  if (open ("testfile", O_RDONLY, S_IWRITE | S_IREAD) == -1 && errno == ENOENT)
    return 0;
  else
    return 1;
}], have_unlink_open_file=yes, have_unlink_open_file=no, [
case "${target}" in
  *mingw*) have_unlink_open_file=no ;;
  *) have_unlink_open_file=yes;;
esac])])
if test x"$have_unlink_open_file" = xyes; then
  AC_DEFINE(HAVE_UNLINK_OPEN_FILE, 1, [Define if target can unlink open files.])
fi])

dnl Check whether CRLF is the line terminator
AC_DEFUN([LIBGFOR_CHECK_CRLF], [
  AC_CACHE_CHECK([whether the target has CRLF as line terminator],
                  have_crlf, [
  AC_TRY_RUN([
/* This test program should exit with status 0 if system uses a CRLF as
   line terminator, and status 1 otherwise.  
   Since it is used to check for mingw systems, and should return 0 in any
   other case, in case of a failure we will not use CRLF.  */
#include <sys/stat.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdio.h>

int main ()
{
#ifndef O_BINARY
  exit(1);
#else
  int fd, bytes;
  char buff[5];

  fd = open ("foo", O_WRONLY | O_CREAT | O_TRUNC, S_IRWXU);
  if (fd < 0)
    exit(1);
  if (write (fd, "\n", 1) < 0)
    perror ("write");
  
  close (fd);
  
  if ((fd = open ("foo", O_RDONLY | O_BINARY, S_IRWXU)) < 0)
    exit(1);
  bytes = read (fd, buff, 5);
  if (bytes == 2 && buff[0] == '\r' && buff[1] == '\n')
    exit(0);
  else
    exit(1);
#endif
}], have_crlf=yes, have_crlf=no, [
case "${target}" in
  *mingw*) have_crlf=yes ;;
  *) have_crlf=no;;
esac])])
if test x"$have_crlf" = xyes; then
  AC_DEFINE(HAVE_CRLF, 1, [Define if CRLF is line terminator.])
fi])

dnl Check whether isfinite is broken.
dnl The most common problem is that it does not work on long doubles.
AC_DEFUN([LIBGFOR_CHECK_FOR_BROKEN_ISFINITE], [
  AC_CACHE_CHECK([whether isfinite is broken],
                  have_broken_isfinite, [
  libgfor_check_for_broken_isfinite_save_LIBS=$LIBS
  LIBS="$LIBS -lm"
  AC_TRY_RUN([
#ifdef HAVE_MATH_H
#include <math.h>
#endif
#include <float.h>
int main ()
{
#ifdef isfinite
#ifdef LDBL_MAX
  if (!isfinite(LDBL_MAX)) return 1;
#endif
#ifdef DBL_MAX
  if (!isfinite(DBL_MAX)) return 1;
#endif
#endif
return 0;
}], have_broken_isfinite=no, have_broken_isfinite=yes, [
case "${target}" in
  hppa*-*-hpux*) have_broken_isfinite=yes ;;
  *) have_broken_isfinite=no ;;
esac])]
  LIBS=$libgfor_check_for_broken_isfinite_save_LIBS)
if test x"$have_broken_isfinite" = xyes; then
  AC_DEFINE(HAVE_BROKEN_ISFINITE, 1, [Define if isfinite is broken.])
fi])

dnl Check whether isnan is broken.
dnl The most common problem is that it does not work on long doubles.
AC_DEFUN([LIBGFOR_CHECK_FOR_BROKEN_ISNAN], [
  AC_CACHE_CHECK([whether isnan is broken],
                  have_broken_isnan, [
  libgfor_check_for_broken_isnan_save_LIBS=$LIBS
  LIBS="$LIBS -lm"
  AC_TRY_RUN([
#ifdef HAVE_MATH_H
#include <math.h>
#endif
#include <float.h>
int main ()
{
#ifdef isnan
#ifdef LDBL_MAX
  {
    long double x;
    x = __builtin_nanl ("");
    if (!isnan(x)) return 1;
    if (isnan(LDBL_MAX)) return 1;
#ifdef NAN
    x = (long double) NAN;
    if (!isnan(x)) return 1;
#endif
  }
#endif
#ifdef DBL_MAX
  {
    double y;
    y = __builtin_nan ("");
    if (!isnan(y)) return 1;
    if (isnan(DBL_MAX)) return 1;
#ifdef NAN
    y = (double) NAN;
    if (!isnan(y)) return 1;
#endif
  }
#endif
#endif
return 0;
}], have_broken_isnan=no, have_broken_isnan=yes, [
case "${target}" in
  hppa*-*-hpux*) have_broken_isnan=yes ;;
  *) have_broken_isnan=no ;;
esac])]
  LIBS=$libgfor_check_for_broken_isnan_save_LIBS)
if test x"$have_broken_isnan" = xyes; then
  AC_DEFINE(HAVE_BROKEN_ISNAN, 1, [Define if isnan is broken.])
fi])

dnl Check whether fpclassify is broken.
dnl The most common problem is that it does not work on long doubles.
AC_DEFUN([LIBGFOR_CHECK_FOR_BROKEN_FPCLASSIFY], [
  AC_CACHE_CHECK([whether fpclassify is broken],
                  have_broken_fpclassify, [
  libgfor_check_for_broken_fpclassify_save_LIBS=$LIBS
  LIBS="$LIBS -lm"
  AC_TRY_RUN([
#ifdef HAVE_MATH_H
#include <math.h>
#endif
#include <float.h>
int main ()
{
#ifdef fpclassify
#ifdef LDBL_MAX
        if (fpclassify(LDBL_MAX) == FP_NAN
            || fpclassify(LDBL_MAX) == FP_INFINITE) return 1;
#endif
#ifdef DBL_MAX
        if (fpclassify(DBL_MAX) == FP_NAN
            || fpclassify(DBL_MAX) == FP_INFINITE) return 1;
#endif
#endif
return 0;
}], have_broken_fpclassify=no, have_broken_fpclassify=yes, [
case "${target}" in
  hppa*-*-hpux*) have_broken_fpclassify=yes ;;
  *) have_broken_fpclassify=no ;;
esac])]
  LIBS=$libgfor_check_for_broken_fpclassify_save_LIBS)
if test x"$have_broken_fpclassify" = xyes; then
  AC_DEFINE(HAVE_BROKEN_FPCLASSIFY, 1, [Define if fpclassify is broken.])
fi])

dnl Check whether the st_ino and st_dev stat fields taken together uniquely
dnl identify the file within the system. This is should be true for POSIX
dnl systems; it is known to be false on mingw32.
AC_DEFUN([LIBGFOR_CHECK_WORKING_STAT], [
  AC_CACHE_CHECK([whether the target stat is reliable],
                  have_working_stat, [
  AC_TRY_RUN([
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

int main ()
{ 
  FILE *f, *g;
  struct stat st1, st2;

  f = fopen ("foo", "w");
  g = fopen ("bar", "w");
  if (stat ("foo", &st1) != 0 || stat ("bar", &st2))
    return 1;
  if (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino)
    return 1;
  fclose(f);
  fclose(g);
  return 0;
}], have_working_stat=yes, have_working_stat=no, [
case "${target}" in
  *mingw*) have_working_stat=no ;;
  *) have_working_stat=yes;;
esac])])
if test x"$have_working_stat" = xyes; then
  AC_DEFINE(HAVE_WORKING_STAT, 1, [Define if target has a reliable stat.])
fi])

dnl Checks for fpsetmask function.
AC_DEFUN([LIBGFOR_CHECK_FPSETMASK], [
  AC_CACHE_CHECK([whether fpsetmask is present], have_fpsetmask, [
    AC_TRY_LINK([
#if HAVE_FLOATINGPOINT_H
# include <floatingpoint.h>
#endif /* HAVE_FLOATINGPOINT_H */
#if HAVE_IEEEFP_H
# include <ieeefp.h>
#endif /* HAVE_IEEEFP_H */],[fpsetmask(0);],
    eval "have_fpsetmask=yes", eval "have_fpsetmask=no")
  ])
  if test x"$have_fpsetmask" = xyes; then
    AC_DEFINE(HAVE_FPSETMASK, 1, [Define if you have fpsetmask.])
  fi
])