forked from fraga/mpfr
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathacinclude.m4
1725 lines (1611 loc) · 56.2 KB
/
acinclude.m4
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
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
dnl MPFR specific autoconf macros
dnl Copyright 2000, 2002-2019 Free Software Foundation, Inc.
dnl Contributed by the AriC and Caramba projects, INRIA.
dnl
dnl This file is part of the GNU MPFR Library.
dnl
dnl The GNU MPFR Library is free software; you can redistribute it and/or modify
dnl it under the terms of the GNU Lesser General Public License as published
dnl by the Free Software Foundation; either version 3 of the License, or (at
dnl your option) any later version.
dnl
dnl The GNU MPFR Library is distributed in the hope that it will be useful, but
dnl WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
dnl or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
dnl License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public License
dnl along with the GNU MPFR Library; see the file COPYING.LESSER. If not, see
dnl https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
dnl 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
dnl autoconf 2.60 is necessary because of the use of AC_PROG_SED.
dnl The following line allows the autoconf wrapper (when installed)
dnl to work as expected.
dnl If you change the required version, please update README.dev too!
AC_PREREQ(2.60)
dnl ------------------------------------------------------------
dnl You must put in MPFR_CONFIGS everything which configure MPFR
dnl except:
dnl - Everything dealing with CC and CFLAGS in particular the ABI
dnl but the IEEE-754 specific flags must be set here.
dnl - Tests that depend on gmp.h (see MPFR_CHECK_DBL2INT_BUG as an example:
dnl a function needs to be defined and called in configure.ac).
dnl - GMP's linkage.
dnl - Libtool stuff.
dnl - Handling of special arguments of MPFR's configure.
AC_DEFUN([MPFR_CONFIGS],
[
AC_REQUIRE([AC_OBJEXT])
AC_REQUIRE([MPFR_CHECK_LIBM])
AC_REQUIRE([MPFR_CHECK_LIBQUADMATH])
AC_REQUIRE([AC_HEADER_TIME])
AC_REQUIRE([AC_CANONICAL_HOST])
dnl Features for the MPFR shared cache. This needs to be done
dnl quite early since this may change CC, CFLAGS and LIBS, which
dnl may affect the other tests.
if test "$enable_shared_cache" = yes; then
dnl Prefer ISO C11 threads (as in mpfr-thread.h).
MPFR_CHECK_C11_THREAD()
if test "$mpfr_c11_thread_ok" != yes; then
dnl Check for POSIX threads. Since the AX_PTHREAD macro is not standard
dnl (it is provided by autoconf-archive), we need to detect whether it
dnl is left unexpanded, otherwise the configure script won't fail and
dnl "make distcheck" won't give any error, yielding buggy tarballs!
dnl The \b is necessary to avoid an error with recent ax_pthread.m4
dnl (such as with Debian's autoconf-archive 20160320-1), which contains
dnl AX_PTHREAD_ZOS_MISSING, etc. It is not documented, but see:
dnl https://lists.gnu.org/archive/html/autoconf/2015-03/msg00011.html
dnl
dnl Note: each time a change is done in m4_pattern_forbid, autogen.sh
dnl should be tested with and without ax_pthread.m4 availability (in
dnl the latter case, there should be an error).
m4_pattern_forbid([AX_PTHREAD\b])
AX_PTHREAD([])
if test "$ax_pthread_ok" = yes; then
CC="$PTHREAD_CC"
CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
LIBS="$LIBS $PTHREAD_LIBS"
dnl Do a compilation test, as this is currently not done by AX_PTHREAD.
dnl Moreover, MPFR needs pthread_rwlock_t, which is conditionally defined
dnl in glibc's bits/pthreadtypes.h (via <pthread.h>), not sure why...
AC_MSG_CHECKING([for pthread_rwlock_t])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <pthread.h>
]], [[
pthread_rwlock_t lock; (void) lock;
]])],
[AC_MSG_RESULT([yes])
mpfr_pthread_ok=yes],
[AC_MSG_RESULT([no])
mpfr_pthread_ok=no])
else
mpfr_pthread_ok=no
fi
fi
AC_MSG_CHECKING(if shared cache can be supported)
if test "$mpfr_c11_thread_ok" = yes; then
AC_MSG_RESULT([yes, with ISO C11 threads])
elif test "$mpfr_pthread_ok" = yes; then
AC_MSG_RESULT([yes, with pthread])
else
AC_MSG_RESULT(no)
AC_MSG_ERROR([shared cache needs C11 threads or pthread support])
fi
fi
dnl End of features for the MPFR shared cache.
AC_CHECK_HEADER([limits.h],, AC_MSG_ERROR([limits.h not found]))
AC_CHECK_HEADER([float.h],, AC_MSG_ERROR([float.h not found]))
AC_CHECK_HEADER([string.h],, AC_MSG_ERROR([string.h not found]))
dnl Check for locales
AC_CHECK_HEADERS([locale.h])
dnl Check for wide characters (wchar_t and wint_t)
AC_CHECK_HEADERS([wchar.h])
dnl Check for stdargs
AC_CHECK_HEADER([stdarg.h],[AC_DEFINE([HAVE_STDARG],1,[Define if stdarg])],
[AC_CHECK_HEADER([varargs.h],,
AC_MSG_ERROR([stdarg.h or varargs.h not found]))])
dnl sys/fpu.h - MIPS specific
AC_CHECK_HEADERS([sys/time.h sys/fpu.h])
dnl Android has a <locale.h>, but not the following members.
AC_CHECK_MEMBERS([struct lconv.decimal_point, struct lconv.thousands_sep],,,
[#include <locale.h>])
dnl Check how to get `alloca'
AC_FUNC_ALLOCA
dnl Define uintptr_t if not available.
AC_TYPE_UINTPTR_T
dnl va_copy macro
AC_MSG_CHECKING([how to copy va_list])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <stdarg.h>
]], [[
va_list ap1, ap2;
va_copy(ap1, ap2);
]])], [
AC_MSG_RESULT([va_copy])
AC_DEFINE(HAVE_VA_COPY)
], [AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <stdarg.h>
]], [[
va_list ap1, ap2;
__va_copy(ap1, ap2);
]])], [AC_DEFINE([HAVE___VA_COPY]) AC_MSG_RESULT([__va_copy])],
[AC_MSG_RESULT([memcpy])])])
dnl FIXME: The functions memmove, memset and strtol are really needed by
dnl MPFR, but if they are implemented as macros, this is also OK (in our
dnl case). So, we do not return an error, but their tests are currently
dnl useless.
dnl Moreover, for memmove and memset, when gcc -Werror is used, these
dnl functions are considered to be missing because of a "conflicting
dnl types for built-in function" error. Possible workarounds if the
dnl results of this test are used (thus one doesn't want an error):
dnl * If "$GCC" is set, disable built-ins by adding -fno-builtin
dnl to $CFLAGS for this test (this would yield a failure if such
dnl functions are defined only as built-ins, but does this occur
dnl in practice?).
dnl * Enable -Werror only for the main compilation (and possibly
dnl some particular tests) via a new configure option.
dnl gettimeofday is not defined for MinGW
AC_CHECK_FUNCS([memmove memset setlocale strtol gettimeofday signal])
dnl We cannot use AC_CHECK_FUNCS on sigaction, because while this
dnl function may be provided by the C library, its prototype and
dnl associated structure may not be available, e.g. when compiling
dnl with "gcc -std=c99".
AC_MSG_CHECKING(for sigaction and its associated structure)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <signal.h>
static int f (int (*func)(int, const struct sigaction *, struct sigaction *))
{ return 0; }
]], [[
return f(sigaction);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_SIGACTION, 1,
[Define if you have a working sigaction function.])
],[AC_MSG_RESULT(no)])
dnl check for long long
AC_CHECK_TYPE([long long int],
AC_DEFINE(HAVE_LONG_LONG, 1, [Define if compiler supports long long]),,)
dnl intmax_t is C99
AC_CHECK_TYPES([intmax_t])
if test "$ac_cv_type_intmax_t" = yes; then
AC_CACHE_CHECK([for working INTMAX_MAX], mpfr_cv_have_intmax_max, [
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[#include "mpfr-intmax.h"]],
[[intmax_t x = INTMAX_MAX; (void) x;]]
)],
mpfr_cv_have_intmax_max=yes, mpfr_cv_have_intmax_max=no)
CPPFLAGS="$saved_CPPFLAGS"
])
if test "$mpfr_cv_have_intmax_max" = "yes"; then
AC_DEFINE(MPFR_HAVE_INTMAX_MAX,1,[Define if you have a working INTMAX_MAX.])
fi
AC_CACHE_CHECK([for working printf length modifier for intmax_t],
mpfr_cv_printf_maxlm, [
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
for modifier in j ll l
do
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
#include <string.h>
#include "mpfr-intmax.h"
]],[[
char s[64];
sprintf (s, "%${modifier}d %${modifier}u",
(intmax_t) -17, (uintmax_t) 42);
return strcmp (s, "-17 42") != 0;
]])],
mpfr_cv_printf_maxlm=${modifier}; break,
mpfr_cv_printf_maxlm=none,
dnl We assume that j is working when cross-compiling.
mpfr_cv_printf_maxlm=j; break
)
done
CPPFLAGS="$saved_CPPFLAGS"
])
if test "$mpfr_cv_printf_maxlm" != "none"; then
AC_DEFINE_UNQUOTED([MPFR_PRINTF_MAXLM],["$mpfr_cv_printf_maxlm"],
[Define to a working printf length modifier for intmax_t])
fi
fi
AC_CHECK_TYPE( [union fpc_csr],
AC_DEFINE(HAVE_FPC_CSR,1,[Define if union fpc_csr is available]), ,
[
#if HAVE_SYS_FPU_H
# include <sys/fpu.h>
#endif
])
dnl Check for _Noreturn function specifier (ISO C11)
AC_CACHE_CHECK([for _Noreturn], mpfr_cv_have_noreturn, [
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[_Noreturn void foo(int);]])],
mpfr_cv_have_noreturn=yes, mpfr_cv_have_noreturn=no)
])
if test "$mpfr_cv_have_noreturn" = "yes"; then
AC_DEFINE(MPFR_HAVE_NORETURN,1,[Define if the _Noreturn function specifier is supported.])
fi
dnl Check for __builtin_unreachable
AC_CACHE_CHECK([for __builtin_unreachable], mpfr_cv_have_builtin_unreachable,
[
AC_LINK_IFELSE([AC_LANG_PROGRAM(
[[int x;]],
[[if (x) __builtin_unreachable(); ]]
)],
mpfr_cv_have_builtin_unreachable=yes,
mpfr_cv_have_builtin_unreachable=no)
])
if test "$mpfr_cv_have_builtin_unreachable" = "yes"; then
AC_DEFINE(MPFR_HAVE_BUILTIN_UNREACHABLE, 1,
[Define if the __builtin_unreachable GCC built-in is supported.])
fi
dnl Check for attribute constructor and destructor
MPFR_CHECK_CONSTRUCTOR_ATTR()
dnl Check for fesetround
AC_CACHE_CHECK([for fesetround], mpfr_cv_have_fesetround, [
saved_LIBS="$LIBS"
LIBS="$LIBS $MPFR_LIBM"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <fenv.h>]], [[fesetround(FE_TONEAREST);]])],
mpfr_cv_have_fesetround=yes, mpfr_cv_have_fesetround=no)
LIBS="$saved_LIBS"
])
if test "$mpfr_cv_have_fesetround" = "yes"; then
AC_DEFINE(MPFR_HAVE_FESETROUND,1,[Define if you have the `fesetround' function via the <fenv.h> header file.])
fi
dnl Check for gcc float-conversion bug; if need be, -ffloat-store is used to
dnl force the conversion to the destination type when a value is stored to
dnl a variable (see ISO C99 standard 5.1.2.3#13, 6.3.1.5#2, 6.3.1.8#2). This
dnl is important concerning the exponent range. Note that this doesn't solve
dnl the double-rounding problem.
if test -n "$GCC"; then
AC_CACHE_CHECK([for gcc float-conversion bug], mpfr_cv_gcc_floatconv_bug, [
saved_LIBS="$LIBS"
LIBS="$LIBS $MPFR_LIBM"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <float.h>
#ifdef MPFR_HAVE_FESETROUND
#include <fenv.h>
#endif
static double get_max (void);
int main (void) {
double x = 0.5;
double y;
int i;
for (i = 1; i <= 11; i++)
x *= x;
if (x != 0)
return 1;
#ifdef MPFR_HAVE_FESETROUND
/* Useful test for the G4 PowerPC */
fesetround(FE_TOWARDZERO);
x = y = get_max ();
x *= 2.0;
if (x != y)
return 1;
#endif
return 0;
}
static double get_max (void) { static volatile double d = DBL_MAX; return d; }
]])],
[mpfr_cv_gcc_floatconv_bug="no"],
[mpfr_cv_gcc_floatconv_bug="yes, use -ffloat-store"],
[mpfr_cv_gcc_floatconv_bug="cannot test, use -ffloat-store"])
LIBS="$saved_LIBS"
])
if test "$mpfr_cv_gcc_floatconv_bug" != "no"; then
CFLAGS="$CFLAGS -ffloat-store"
fi
fi
dnl Check if subnormal (denormalized) numbers are supported
dnl for the binary64 format, the smallest normal number is 2^(-1022)
dnl for the binary32 format, the smallest normal number is 2^(-126)
AC_CACHE_CHECK([for subnormal double-precision numbers],
mpfr_cv_have_denorms, [
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
int main (void) {
double x = 2.22507385850720138309e-308;
fprintf (stderr, "%e\n", x / 2.0);
return 2.0 * (double) (x / 2.0) != x;
}
]])],
[mpfr_cv_have_denorms="yes"],
[mpfr_cv_have_denorms="no"],
[mpfr_cv_have_denorms="cannot test, assume no"])
])
if test "$mpfr_cv_have_denorms" = "yes"; then
AC_DEFINE(HAVE_DENORMS,1,[Define if subnormal (denormalized) doubles work.])
fi
AC_CACHE_CHECK([for subnormal single-precision numbers],
mpfr_cv_have_denorms_flt, [
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
int main (void) {
float x = 1.17549435082229e-38;
fprintf (stderr, "%e\n", x / 2.0);
return 2.0 * (float) (x / 2.0) != x;
}
]])],
[mpfr_cv_have_denorms_flt="yes"],
[mpfr_cv_have_denorms_flt="no"],
[mpfr_cv_have_denorms_flt="cannot test, assume no"])
])
if test "$mpfr_cv_have_denorms_flt" = "yes"; then
AC_DEFINE(HAVE_DENORMS_FLT,1,
[Define if subnormal (denormalized) floats work.])
fi
dnl Check if signed zeros are supported. Note: the test will fail
dnl if the division by 0 generates a trap.
AC_CACHE_CHECK([for signed zeros], mpfr_cv_have_signedz, [
AC_RUN_IFELSE([AC_LANG_SOURCE([[
int main (void) {
return 1.0 / 0.0 == 1.0 / -0.0;
}
]])],
[mpfr_cv_have_signedz="yes"],
[mpfr_cv_have_signedz="no"],
[mpfr_cv_have_signedz="cannot test, assume no"])
])
if test "$mpfr_cv_have_signedz" = "yes"; then
AC_DEFINE(HAVE_SIGNEDZ,1,[Define if signed zeros are supported.])
fi
dnl Check the FP division by 0 fails (e.g. on a non-IEEE-754 platform).
dnl In such a case, MPFR_ERRDIVZERO is defined to disable the tests
dnl involving a FP division by 0.
dnl For the developers: to check whether all these tests are disabled,
dnl configure MPFR with "-DMPFR_TESTS_FPE_DIV -DMPFR_ERRDIVZERO".
AC_CACHE_CHECK([if the FP division by 0 fails], mpfr_cv_errdivzero, [
AC_RUN_IFELSE([AC_LANG_SOURCE([[
int main (void) {
volatile double d = 0.0, x;
x = 0.0 / d;
x = 1.0 / d;
(void) x;
return 0;
}
]])],
[mpfr_cv_errdivzero="no"],
[mpfr_cv_errdivzero="yes"],
[mpfr_cv_errdivzero="cannot test, assume no"])
])
if test "$mpfr_cv_errdivzero" = "yes"; then
AC_DEFINE(MPFR_ERRDIVZERO,1,[Define if the FP division by 0 fails.])
AC_MSG_WARN([The floating-point division by 0 fails instead of])
AC_MSG_WARN([returning a special value: NaN or infinity. Tests])
AC_MSG_WARN([involving a FP division by 0 will be disabled.])
fi
dnl Check whether NAN != NAN (as required by the IEEE-754 standard,
dnl but not by the ISO C standard). For instance, this is false with
dnl MIPSpro 7.3.1.3m under IRIX64. By default, assume this is true.
AC_CACHE_CHECK([if NAN == NAN], mpfr_cv_nanisnan, [
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#include <stdio.h>
#include <math.h>
#ifndef NAN
# define NAN (0.0/0.0)
#endif
int main (void) {
double d;
d = NAN;
return d != d;
}
]])],
[mpfr_cv_nanisnan="yes"],
[mpfr_cv_nanisnan="no"],
[mpfr_cv_nanisnan="cannot test, assume no"])
])
if test "$mpfr_cv_nanisnan" = "yes"; then
AC_DEFINE(MPFR_NANISNAN,1,[Define if NAN == NAN.])
AC_MSG_WARN([The test NAN != NAN is false. The probable reason is that])
AC_MSG_WARN([your compiler optimizes floating-point expressions in an])
AC_MSG_WARN([unsafe way because some option, such as -ffast-math or])
AC_MSG_WARN([-fast (depending on the compiler), has been used. You])
AC_MSG_WARN([should NOT use such an option, otherwise MPFR functions])
AC_MSG_WARN([such as mpfr_get_d and mpfr_set_d may return incorrect])
AC_MSG_WARN([results on special FP numbers (e.g. NaN or signed zeros).])
AC_MSG_WARN([If you did not use such an option, please send us a bug])
AC_MSG_WARN([report so that we can try to find a workaround for your])
AC_MSG_WARN([platform and/or document the behavior.])
fi
dnl Check if the chars '0' to '9' are consecutive values
AC_MSG_CHECKING([if charset has consecutive values])
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
char *number = "0123456789";
char *lower = "abcdefghijklmnopqrstuvwxyz";
char *upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
]],[[
int i;
unsigned char *p;
for (p = (unsigned char*) number, i = 0; i < 9; i++)
if ( (*p)+1 != *(p+1) ) return 1;
for (p = (unsigned char*) lower, i = 0; i < 25; i++)
if ( (*p)+1 != *(p+1) ) return 1;
for (p = (unsigned char*) upper, i = 0; i < 25; i++)
if ( (*p)+1 != *(p+1) ) return 1;
]])], [AC_MSG_RESULT(yes)],[
AC_MSG_RESULT(no)
AC_DEFINE(MPFR_NO_CONSECUTIVE_CHARSET,1,[Charset is not consecutive])
], [AC_MSG_RESULT(cannot test)])
dnl Must be checked with the LIBM
dnl but we don't want to add the LIBM to MPFR dependency.
dnl Can't use AC_CHECK_FUNCS since the function may be in LIBM but
dnl not exported in math.h
saved_LIBS="$LIBS"
LIBS="$LIBS $MPFR_LIBM"
dnl AC_CHECK_FUNCS([round trunc floor ceil nearbyint])
AC_MSG_CHECKING(for math/round)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(round);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_ROUND, 1,[Have ISO C99 round function])
],[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for math/trunc)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(trunc);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_TRUNC, 1,[Have ISO C99 trunc function])
],[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for math/floor)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(floor);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_FLOOR, 1,[Have ISO C99 floor function])
],[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for math/ceil)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(ceil);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_CEIL, 1,[Have ISO C99 ceil function])
],[AC_MSG_RESULT(no)])
AC_MSG_CHECKING(for math/nearbyint)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <math.h>
static int f (double (*func)(double)) { return 0; }
]], [[
return f(nearbyint);
]])], [
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_NEARBYINT, 1,[Have ISO C99 nearbyint function])
],[AC_MSG_RESULT(no)])
dnl Check if _mulx_u64 is provided
dnl Note: This intrinsic is not standard. We need a run because
dnl it may be provided but not working as expected (with ICC 15,
dnl one gets an "Illegal instruction").
AC_MSG_CHECKING([for _mulx_u64])
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <immintrin.h>
]], [[
unsigned long long h1, h2;
_mulx_u64(17, 42, &h1);
_mulx_u64(-1, -1, &h2);
return h1 == 0 && h2 == -2 ? 0 : 1;
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_MULX_U64, 1,[Have a working _mulx_u64 function])
],
[AC_MSG_RESULT(no)
],
[AC_MSG_RESULT([cannot test, assume no])
])
LIBS="$saved_LIBS"
dnl Now try to check the long double format
MPFR_C_LONG_DOUBLE_FORMAT
dnl Check if thread-local variables are supported.
dnl At least two problems can occur in practice:
dnl 1. The compilation fails, e.g. because the compiler doesn't know
dnl about the __thread keyword.
dnl 2. The compilation succeeds, but the system doesn't support TLS or
dnl there is some ld configuration problem. One of the effects can
dnl be that thread-local variables always evaluate to 0. So, it is
dnl important to run the test below.
if test "$enable_thread_safe" != no; then
AC_MSG_CHECKING(for TLS support using C11)
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#define MPFR_USE_THREAD_SAFE 1
#define MPFR_USE_C11_THREAD_SAFE 1
#include "mpfr-thread.h"
MPFR_THREAD_ATTR int x = 17;
int main (void) {
return x != 17;
}
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_USE_THREAD_SAFE],1,[Build MPFR as thread safe])
AC_DEFINE([MPFR_USE_C11_THREAD_SAFE],1,[Build MPFR as thread safe using C11])
tls_c11_support=yes
enable_thread_safe=yes
],
[AC_MSG_RESULT(no)
],
[AC_MSG_RESULT([cannot test, assume no])
])
CPPFLAGS="$saved_CPPFLAGS"
if test "$tls_c11_support" != "yes"
then
AC_MSG_CHECKING(for TLS support)
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#define MPFR_USE_THREAD_SAFE 1
#include "mpfr-thread.h"
MPFR_THREAD_ATTR int x = 17;
int main (void) {
return x != 17;
}
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_USE_THREAD_SAFE],1,[Build MPFR as thread safe])
enable_thread_safe=yes
],
[AC_MSG_RESULT(no)
if test "$enable_thread_safe" = yes; then
AC_MSG_ERROR([please configure with --disable-thread-safe])
fi
],
[if test "$enable_thread_safe" = yes; then
AC_MSG_RESULT([cannot test, assume yes])
AC_DEFINE([MPFR_USE_THREAD_SAFE],1,[Build MPFR as thread safe])
else
AC_MSG_RESULT([cannot test, assume no])
fi
])
CPPFLAGS="$saved_CPPFLAGS"
fi
fi
dnl Check if decimal floats are available.
dnl For the different cases, we try to use values that will not be returned
dnl by build tools. For instance, 1 must not be used as it can be returned
dnl by ld in case of link failure.
dnl Note: We currently reread the 64-bit data memory as a double and compare
dnl it with constants. However, if there is any issue with double, such as
dnl the use of an extended precision, this may fail. Possible solutions:
dnl 1. Use the hex format for the double constants (this format should be
dnl supported if _Decimal64 is).
dnl 2. Use more precision in the double constants (more decimal digits),
dnl just in case.
dnl 3. Use uint64_t (or unsigned long long, though this type might not be
dnl on 64 bits) instead of or in addition to the test on double.
dnl 4. Use an array of 8 unsigned char's instead of or in addition to the
dnl test on double, considering the 2 practical cases of endianness.
if test "$enable_decimal_float" != no; then
AC_MSG_CHECKING(if compiler knows _Decimal64)
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[_Decimal64 x;]])],
[AC_MSG_RESULT(yes)
AC_MSG_CHECKING(decimal float format)
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdlib.h>
]], [[
volatile _Decimal64 x = 1;
union { double d; _Decimal64 d64; } y;
if (x != x) return 83;
y.d64 = 1234567890123456.0dd;
return y.d == 0.14894469406741037E-123 ? 80 :
y.d == 0.59075095508629822E-68 ? 81 : 82;
]])], [AC_MSG_RESULT(internal error)
AC_MSG_FAILURE(unexpected exit status 0)],
[d64_exit_status=$?
case "$d64_exit_status" in
80) AC_MSG_RESULT(DPD)
AC_DEFINE([DPD_FORMAT],1,[DPD format])
AC_DEFINE([MPFR_WANT_DECIMAL_FLOATS],1,
[Build decimal float functions]) ;;
81) AC_MSG_RESULT(BID)
AC_DEFINE([MPFR_WANT_DECIMAL_FLOATS],1,
[Build decimal float functions]) ;;
82) AC_MSG_RESULT(neither DPD nor BID)
if test "$enable_decimal_float" = yes; then
AC_MSG_ERROR([unsupported decimal float format.
Please build MPFR without --enable-decimal-float.])
fi ;;
*) AC_MSG_RESULT(unknown (exit status $d64_exit_status))
if test "$enable_decimal_float" = yes; then
AC_MSG_ERROR([internal or link error.
Please build MPFR without --enable-decimal-float.])
fi ;;
esac],
[AC_MSG_RESULT(assuming DPD)
AC_DEFINE([DPD_FORMAT],1,[])
AC_DEFINE([MPFR_WANT_DECIMAL_FLOATS],1,
[Build decimal float functions])])
],
[AC_MSG_RESULT(no)
if test "$enable_decimal_float" = yes; then
AC_MSG_ERROR([compiler doesn't know _Decimal64 (ISO/IEC TR 24732).
Please use another compiler or build MPFR without --enable-decimal-float.])
fi])
fi
dnl Check the bit-field ordering for _Decimal128.
dnl Little endian: sig=0 comb=49400 t0=0 t1=0 t2=0 t3=10
dnl Big endian: sig=0 comb=8 t0=0 t1=0 t2=0 t3=570933248
AC_MSG_CHECKING(bit-field ordering for _Decimal128)
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
]], [[
union ieee_decimal128
{
struct
{
unsigned int t3:32;
unsigned int t2:32;
unsigned int t1:32;
unsigned int t0:14;
unsigned int comb:17;
unsigned int sig:1;
} s;
_Decimal128 d128;
} x;
x.d128 = 1.0dl;
if (x.s.sig==0 && x.s.comb==49400 && x.s.t0==0 && x.s.t1==0 && x.s.t2==0 && x.s.t3==10)
return 1; /* little endian */
else if (x.s.sig==0 && x.s.comb==8 && x.s.t0==0 && x.s.t1==0 && x.s.t2==0 && x.s.t3==570933248)
return 2; /* big endian */
else
return 0; /* unknown encoding */
]])], [AC_MSG_RESULT(unknown)],
[d128_exit_status=$?
case "$d128_exit_status" in
1) AC_MSG_RESULT(little endian)
AC_DEFINE([HAVE_DECIMAL128_IEEE_LITTLE_ENDIAN],1) ;;
2) AC_MSG_RESULT(big endian)
AC_DEFINE([HAVE_DECIMAL128_IEEE_BIG_ENDIAN],1) ;;
esac],
[AC_MSG_RESULT(cannot test)])
dnl Check if _Float128 or __float128 is available. We also require the
dnl compiler to support hex constants with the f128 or q suffix (this
dnl prevents the _Float128 support with GCC's -std=c90, but who cares?).
dnl Note: We use AC_LINK_IFELSE instead of AC_COMPILE_IFELSE since an
dnl error may occur only at link time, such as under NetBSD:
dnl https://mail-index.netbsd.org/pkgsrc-users/2018/02/02/msg026220.html
dnl https://mail-index.netbsd.org/pkgsrc-users/2018/02/05/msg026238.html
dnl By using volatile and making the exit code depend on the value of
dnl this variable, we also make sure that optimization doesn't make
dnl the "undefined reference" error disappear.
if test "$enable_float128" != no; then
AC_MSG_CHECKING(if _Float128 with hex constants is supported)
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[
volatile _Float128 x = 0x1.fp+16383f128;
return x == 0;
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_WANT_FLOAT128],1,[Build float128 functions])],
[AC_MSG_RESULT(no)
AC_MSG_CHECKING(if __float128 can be used as a fallback)
dnl Use the q suffix in this case.
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#define _Float128 __float128
]], [[
volatile _Float128 x = 0x1.fp+16383q;
return x == 0;
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_WANT_FLOAT128],2,
[Build float128 functions with float128 fallback])
AC_DEFINE([_Float128],[__float128],[__float128 fallback])],
[AC_MSG_RESULT(no)
if test "$enable_float128" = yes; then
AC_MSG_ERROR(
[compiler doesn't know _Float128 or __float128 with hex constants.
Please use another compiler or build MPFR without --enable-float128.])
fi])
])
fi
dnl Check if Static Assertions are supported.
AC_MSG_CHECKING(for Static Assertion support)
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#define MPFR_USE_STATIC_ASSERT 1
#include "mpfr-sassert.h"
/* Test if Static Assertions work */
MPFR_DECL_STATIC_ASSERT(sizeof(char) <= sizeof(int));
int main (void) {
MPFR_DECL_STATIC_ASSERT(sizeof(int) <= sizeof(long));
int x;
(void) (x = 1); /* cast to void: avoid a warning, at least with GCC */
/* Test of the macro after a declaraction and a statement. */
MPFR_STAT_STATIC_ASSERT(sizeof(short) <= sizeof(int));
return 0;
}
]])],
[AC_MSG_RESULT(yes)
AC_DEFINE([MPFR_USE_STATIC_ASSERT],1,[Build MPFR with Static Assertions])
],
[AC_MSG_RESULT(no)
])
CPPFLAGS="$saved_CPPFLAGS"
if test "$enable_lto" = "yes" ; then
MPFR_LTO
fi
])
dnl end of MPFR_CONFIGS
dnl MPFR_CHECK_GMP
dnl --------------
dnl Check GMP library vs header. Useful if the user provides --with-gmp
dnl with a directory containing a GMP version that doesn't have the
dnl correct ABI: the previous tests won't trigger the error if the same
dnl GMP version with the right ABI is installed on the system, as this
dnl library is automatically selected by the linker, while the header
dnl (which depends on the ABI) of the --with-gmp include directory is
dnl used.
dnl Note: if the error is changed to a warning due to that fact that
dnl libtool is not used, then the same thing should be done for the
dnl other tests based on GMP.
AC_DEFUN([MPFR_CHECK_GMP], [
AC_REQUIRE([MPFR_CONFIGS])dnl
AC_CACHE_CHECK([for GMP library vs header correctness], mpfr_cv_check_gmp, [
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stdio.h>
#include <limits.h>
#include <gmp.h>
]], [[
fprintf (stderr, "GMP_NAIL_BITS = %d\n", (int) GMP_NAIL_BITS);
fprintf (stderr, "GMP_NUMB_BITS = %d\n", (int) GMP_NUMB_BITS);
fprintf (stderr, "mp_bits_per_limb = %d\n", (int) mp_bits_per_limb);
fprintf (stderr, "sizeof(mp_limb_t) = %d\n", (int) sizeof(mp_limb_t));
if (GMP_NAIL_BITS != 0)
{
fprintf (stderr, "GMP_NAIL_BITS != 0\n");
return 1;
}
if (GMP_NUMB_BITS != mp_bits_per_limb)
{
fprintf (stderr, "GMP_NUMB_BITS != mp_bits_per_limb\n");
return 2;
}
if (GMP_NUMB_BITS != sizeof(mp_limb_t) * CHAR_BIT)
{
fprintf (stderr, "GMP_NUMB_BITS != sizeof(mp_limb_t) * CHAR_BIT\n");
return 3;
}
return 0;
]])], [mpfr_cv_check_gmp="yes"],
[mpfr_cv_check_gmp="no (exit status is $?)"],
[mpfr_cv_check_gmp="cannot test, assume yes"])
])
case $mpfr_cv_check_gmp in
no*)
AC_MSG_ERROR([bad GMP library or header - ABI problem?
See 'config.log' for details.]) ;;
esac
])
dnl MPFR_CHECK_DBL2INT_BUG
dnl ----------------------
dnl Check for double-to-integer conversion bug
dnl https://gforge.inria.fr/tracker/index.php?func=detail&aid=14435
dnl For the exit status, the lowest values (including some values after 128)
dnl are reserved for various system errors. So, let's use the largest values
dnl below 255 for errors in the test itself.
dnl The following problem has been seen under Solaris in config.log,
dnl i.e. the failure to link with libgmp wasn't detected in the first
dnl test:
dnl configure: checking if gmp.h version and libgmp version are the same
dnl configure: gcc -o conftest -Wall -Wmissing-prototypes [...]
dnl configure: $? = 0
dnl configure: ./conftest
dnl ld.so.1: conftest: fatal: libgmp.so.10: open failed: No such file [...]
dnl configure: $? = 0
dnl configure: result: yes
dnl configure: checking for double-to-integer conversion bug
dnl configure: gcc -o conftest -Wall -Wmissing-prototypes [...]
dnl configure: $? = 0
dnl configure: ./conftest
dnl ld.so.1: conftest: fatal: libgmp.so.10: open failed: No such file [...]
dnl ./configure[1680]: eval: line 1: 1971: Killed
dnl configure: $? = 9
dnl configure: program exited with status 9
AC_DEFUN([MPFR_CHECK_DBL2INT_BUG], [
AC_REQUIRE([MPFR_CONFIGS])dnl
AC_CACHE_CHECK([for double-to-integer conversion bug], mpfr_cv_dbl_int_bug, [
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <gmp.h>
]], [[
double d;
mp_limb_t u;
int i;
d = 1.0;
for (i = 0; i < GMP_NUMB_BITS - 1; i++)
d = d + d;
u = (mp_limb_t) d;
for (; i > 0; i--)
{
if (u & 1)
break;
u = u >> 1;
}
return (i == 0 && u == 1UL) ? 0 : 254 - i;
]])], [mpfr_cv_dbl_int_bug="no"],
[mpfr_cv_dbl_int_bug="yes or failed to exec (exit status is $?)"],
[mpfr_cv_dbl_int_bug="cannot test, assume not present"])
])
case $mpfr_cv_dbl_int_bug in
yes*)
AC_MSG_ERROR([double-to-integer conversion is incorrect.
You need to use another compiler (or lower the optimization level).]) ;;
esac
])
dnl MPFR_CHECK_MP_LIMB_T_VS_LONG
dnl ----------------------------
dnl Check that a long can fit in a mp_limb_t.
dnl If so, it set the define MPFR_LONG_WITHIN_LIMB
dnl FIXME: The following code is wrong when using:
dnl -std=c99 -pedantic-errors -Wno-error=overlength-strings
dnl because static assertions are not supported, so that MPFR_ASSERTN
dnl is used, but it is not defined by "mpfr-sassert.h". The consequence
dnl is that the program fails, and MPFR_LONG_WITHIN_LIMB is not defined
dnl while it should be. Before fixing this bug, find a way to test with
dnl MPFR_LONG_WITHIN_LIMB undefined; this is necessary for code coverage
dnl and possibly to find new bugs, like in r12252:
dnl ./configure --enable-assert=full \
dnl 'CFLAGS=-std=c99 -O3 -pedantic-errors -Wno-error=overlength-strings'
dnl According to the GMP developers, a limb is always as large as a long,
dnl except when __GMP_SHORT_LIMB is defined, but this is never defined:
dnl https://gmplib.org/list-archives/gmp-discuss/2018-February/006190.html
dnl FIXME: This is not safe. The fact that __GMP_SHORT_LIMB cannot occur
dnl is not documented, and gmp.h has such a code probably because it may
dnl occur in the future (or the user may want to override the default
dnl choice).
AC_DEFUN([MPFR_CHECK_MP_LIMB_T_VS_LONG], [
AC_REQUIRE([MPFR_CONFIGS])
AC_CACHE_CHECK([for long to fit in mp_limb_t], mpfr_cv_long_within_limb, [
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <gmp.h>
#include "mpfr-sassert.h"
]], [[
MPFR_STAT_STATIC_ASSERT ((mp_limb_t) -1 >= (unsigned long) -1);
return 0;
]])], [mpfr_cv_long_within_limb="yes"],
[mpfr_cv_long_within_limb="no"])
])
case $mpfr_cv_long_within_limb in
yes*)
AC_DEFINE([MPFR_LONG_WITHIN_LIMB],1,[long can be stored in mp_limb_t]) ;;
esac
CPPFLAGS="$saved_CPPFLAGS"
])
dnl MPFR_CHECK_MP_LIMB_T_VS_INTMAX
dnl ------------------------------
dnl Check that an intmax_t can fit in a mp_limb_t.
AC_DEFUN([MPFR_CHECK_MP_LIMB_T_VS_INTMAX], [
AC_REQUIRE([MPFR_CONFIGS])
AC_CACHE_CHECK([for intmax_t to fit in mp_limb_t], mpfr_cv_intmax_within_limb, [
saved_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS -I$srcdir/src"
dnl AC_LINK_IFELSE is safier than AC_COMPILE_IFELSE, which did not detect
dnl the missing #include "mpfr-sassert.h".
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <gmp.h>
#include "mpfr-sassert.h"
#include "mpfr-intmax.h"
]], [[
MPFR_STAT_STATIC_ASSERT ((mp_limb_t) -1 >= (uintmax_t) -1);
return 0;
]])], [mpfr_cv_intmax_within_limb="yes"],
[mpfr_cv_intmax_within_limb="no"])
])
case $mpfr_cv_intmax_within_limb in
yes*)
AC_DEFINE([MPFR_INTMAX_WITHIN_LIMB],1,[intmax_t can be stored in mp_limb_t]) ;;
esac
CPPFLAGS="$saved_CPPFLAGS"
])
dnl MPFR_PARSE_DIRECTORY
dnl Input: $1 = a string to a relative or absolute directory
dnl Output: $2 = the variable to set with the absolute directory
AC_DEFUN([MPFR_PARSE_DIRECTORY],
[
dnl Check if argument is a directory
if test -d $1 ; then
dnl Get the absolute path of the directory in case of relative directory
dnl with the realpath command. If the output is empty, the cause may be
dnl that this command has not been found, and we do an alternate test,
dnl the same as what autoconf does for the generated configure script to
dnl determine whether a pathname is absolute or relative.
local_tmp=`realpath $1 2>/dev/null`
if test "$local_tmp" != "" ; then
if test -d "$local_tmp" ; then
$2="$local_tmp"
else
$2=$1
fi
else
dnl The quadrigraphs @<:@, @:>@ and @:}@ produce [, ] and )
dnl respectively (see Autoconf manual). We cannot use quoting here
dnl as the result depends on the context in which this macro is
dnl invoked! To detect that, one needs to look at every instance
dnl of the macro expansion in the generated configure script.
case $1 in
@<:@\\/@:>@* | ?:@<:@\\/@:>@* @:}@ $2=$1 ;;
*@:}@ $2="$PWD"/$1 ;;