summaryrefslogtreecommitdiff
path: root/m4/stdint.m4
blob: fa073cd19d3e9afe0a0903261d5cd3fa35771ce9 (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
# stdint.m4 serial 15
dnl Copyright (C) 2001-2002, 2004-2006 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

dnl From Paul Eggert and Bruno Haible.
dnl Test whether <stdint.h> is supported or must be substituted.

AC_DEFUN([gl_STDINT_H],
[
  AC_PREREQ(2.59)dnl

  dnl Check for long long int.
  AC_REQUIRE([AC_TYPE_LONG_LONG_INT])
  if test $ac_cv_type_long_long_int = yes; then
    HAVE_LONG_LONG_INT=1
  else
    HAVE_LONG_LONG_INT=0
  fi
  AC_SUBST([HAVE_LONG_LONG_INT])

  dnl Check for <wchar.h>.
  AC_CHECK_HEADERS_ONCE([wchar.h])
  if test $ac_cv_header_wchar_h = yes; then
    HAVE_WCHAR_H=1
  else
    HAVE_WCHAR_H=0
  fi
  AC_SUBST([HAVE_WCHAR_H])

  dnl Check for <inttypes.h>.
  dnl AC_INCLUDES_DEFAULT defines $ac_cv_header_inttypes_h.
  if test $ac_cv_header_inttypes_h = yes; then
    HAVE_INTTYPES_H=1
  else
    HAVE_INTTYPES_H=0
  fi
  AC_SUBST([HAVE_INTTYPES_H])

  dnl Check for <sys/types.h>.
  dnl AC_INCLUDES_DEFAULT defines $ac_cv_header_sys_types_h.
  if test $ac_cv_header_sys_types_h = yes; then
    HAVE_SYS_TYPES_H=1
  else
    HAVE_SYS_TYPES_H=0
  fi
  AC_SUBST([HAVE_SYS_TYPES_H])

  dnl AC_INCLUDES_DEFAULT defines $ac_cv_header_stdint_h.
  if test $ac_cv_header_stdint_h = yes; then
    gl_ABSOLUTE_HEADER([stdint.h])
    ABSOLUTE_STDINT_H=\"$gl_cv_absolute_stdint_h\"
    HAVE_STDINT_H=1
  else
    ABSOLUTE_STDINT_H=\"no/such/file/stdint.h\"
    HAVE_STDINT_H=0
  fi
  AC_SUBST([ABSOLUTE_STDINT_H])
  AC_SUBST([HAVE_STDINT_H])

  dnl Now see whether we need a substitute <stdint.h>.  Use
  dnl ABSOLUTE_STDINT_H, not <stdint.h>, so that it also works during
  dnl a "config.status --recheck" if a stdint.h has been
  dnl created in the build directory.
  if test $ac_cv_header_stdint_h = yes; then
    AC_CACHE_CHECK([whether stdint.h conforms to C99],
      [gl_cv_header_working_stdint_h],
      [gl_cv_header_working_stdint_h=no
       AC_COMPILE_IFELSE([
	 AC_LANG_PROGRAM([[
#include <stddef.h>
#define __STDC_LIMIT_MACROS 1 /* to make it work also in C++ mode */
#include ABSOLUTE_STDINT_H
#ifdef INT8_MAX
int8_t a1 = INT8_MAX;
#endif
#ifdef INT16_MAX
int16_t a2 = INT16_MAX;
#endif
#ifdef INT32_MAX
int32_t a3 = INT32_MAX;
#endif
#ifdef INT64_MAX
int64_t a4 = INT64_MAX;
#endif
#ifdef UINT8_MAX
uint8_t b1 = UINT8_MAX;
#else
typedef int b1[(unsigned char) -1 != 255 ? 1 : -1];
#endif
#ifdef UINT16_MAX
uint16_t b2 = UINT16_MAX;
#endif
#ifdef UINT32_MAX
uint32_t b3 = UINT32_MAX;
#endif
#ifdef UINT64_MAX
uint64_t b4 = UINT64_MAX;
#endif
int_least8_t c1 = INT8_C (0x7f);
int_least16_t c2 = INT16_C (0x7fff);
int_least32_t c3 = INT32_C (0x7fffffff);
int_least64_t c4 = INT64_C (0x7fffffffffffffff);
uint_least8_t d1 = UINT8_C (0xff);
uint_least16_t d2 = UINT16_C (0xffff);
uint_least32_t d3 = UINT32_C (0xffffffff);
uint_least64_t d4 = UINT64_C (0xffffffffffffffff);
int_fast8_t e1 = INT_FAST8_MAX;
int_fast16_t e2 = INT_FAST16_MAX;
int_fast32_t e3 = INT_FAST32_MAX;
int_fast64_t e4 = INT_FAST64_MAX;
uint_fast8_t f1 = UINT_FAST8_MAX;
uint_fast16_t f2 = UINT_FAST16_MAX;
uint_fast32_t f3 = UINT_FAST32_MAX;
uint_fast64_t f4 = UINT_FAST64_MAX;
#ifdef INTPTR_MAX
intptr_t g = INTPTR_MAX;
#endif
#ifdef UINTPTR_MAX
uintptr_t h = UINTPTR_MAX;
#endif
intmax_t i = INTMAX_MAX;
uintmax_t j = UINTMAX_MAX;
struct s {
  int check_PTRDIFF: PTRDIFF_MIN < 0 && 0 < PTRDIFF_MAX ? 1 : -1;
  int check_SIG_ATOMIC: SIG_ATOMIC_MIN <= 0 && 0 < SIG_ATOMIC_MAX ? 1 : -1;
  int check_SIZE: 0 < SIZE_MAX ? 1 : -1;
  int check_WCHAR: WCHAR_MIN <= 0 && 0 < WCHAR_MAX ? 1 : -1;
  int check_WINT: WINT_MIN <= 0 && 0 < WINT_MAX ? 1 : -1;

  /* Detect bugs in glibc 2.4 and Solaris 10 stdint.h, among others.  */
  int check_UINT8_C:
	(-1 < UINT8_C (0)) == (-1 < (uint_least8_t) 0) ? 1 : -1;
  int check_UINT16_C:
	(-1 < UINT16_C (0)) == (-1 < (uint_least16_t) 0) ? 1 : -1;

  /* Detect bugs in OpenBSD 3.9 stdint.h.  */
#ifdef UINT8_MAX
  int check_uint8: (uint8_t) -1 == UINT8_MAX ? 1 : -1;
#endif
#ifdef UINT16_MAX
  int check_uint16: (uint16_t) -1 == UINT16_MAX ? 1 : -1;
#endif
#ifdef UINT32_MAX
  int check_uint32: (uint32_t) -1 == UINT32_MAX ? 1 : -1;
#endif
#ifdef UINT64_MAX
  int check_uint64: (uint64_t) -1 == UINT64_MAX ? 1 : -1;
#endif
  int check_uint_least8: (uint_least8_t) -1 == UINT_LEAST8_MAX ? 1 : -1;
  int check_uint_least16: (uint_least16_t) -1 == UINT_LEAST16_MAX ? 1 : -1;
  int check_uint_least32: (uint_least32_t) -1 == UINT_LEAST32_MAX ? 1 : -1;
  int check_uint_least64: (uint_least64_t) -1 == UINT_LEAST64_MAX ? 1 : -1;
  int check_uint_fast8: (uint_fast8_t) -1 == UINT_FAST8_MAX ? 1 : -1;
  int check_uint_fast16: (uint_fast16_t) -1 == UINT_FAST16_MAX ? 1 : -1;
  int check_uint_fast32: (uint_fast32_t) -1 == UINT_FAST32_MAX ? 1 : -1;
  int check_uint_fast64: (uint_fast64_t) -1 == UINT_FAST64_MAX ? 1 : -1;
  int check_uintptr: (uintptr_t) -1 == UINTPTR_MAX ? 1 : -1;
  int check_uintmax: (uintmax_t) -1 == UINTMAX_MAX ? 1 : -1;
  int check_size: (size_t) -1 == SIZE_MAX ? 1 : -1;
};
	 ]])],
         [gl_cv_header_working_stdint_h=yes])])
  fi
  if test "$gl_cv_header_working_stdint_h" != yes; then

    dnl Check for <sys/inttypes.h>, and for
    dnl <sys/bitypes.h> (used in Linux libc4 >= 4.6.7 and libc5).
    AC_CHECK_HEADERS([sys/inttypes.h sys/bitypes.h])
    if test $ac_cv_header_sys_inttypes_h = yes; then
      HAVE_SYS_INTTYPES_H=1
    else
      HAVE_SYS_INTTYPES_H=0
    fi
    AC_SUBST([HAVE_SYS_INTTYPES_H])
    if test $ac_cv_header_sys_bitypes_h = yes; then
      HAVE_SYS_BITYPES_H=1
    else
      HAVE_SYS_BITYPES_H=0
    fi
    AC_SUBST([HAVE_SYS_BITYPES_H])

    gl_STDINT_TYPE_PROPERTIES
    STDINT_H=stdint.h
  fi
  AC_SUBST(STDINT_H)
])

dnl gl_STDINT_BITSIZEOF(TYPES, INCLUDES)
dnl Determine the size of each of the given types in bits.
AC_DEFUN([gl_STDINT_BITSIZEOF],
[
  dnl Use a shell loop, to avoid bloating configure, and
  dnl - extra AH_TEMPLATE calls, so that autoheader knows what to put into
  dnl   config.h.in,
  dnl - extra AC_SUBST calls, so that the right substitutions are made.
  AC_FOREACH([gltype], [$1],
    [AH_TEMPLATE([BITSIZEOF_]translit(gltype,[abcdefghijklmnopqrstuvwxyz ],[ABCDEFGHIJKLMNOPQRSTUVWXYZ_]),
       [Define to the number of bits in type ']gltype['.])])
  for gltype in $1 ; do
    AC_CACHE_CHECK([for bit size of $gltype], [gl_cv_bitsizeof_${gltype}],
      [_AC_COMPUTE_INT([sizeof ($gltype) * CHAR_BIT], result,
	 [$2
#include <limits.h>], [result=unknown])
       eval gl_cv_bitsizeof_${gltype}=\$result
      ])
    eval result=\$gl_cv_bitsizeof_${gltype}
    if test $result = unknown; then
      dnl Use a nonempty default, because some compilers, such as IRIX 5 cc,
      dnl do a syntax check even on unused #if conditions and give an error
      dnl on valid C code like this:
      dnl   #if 0
      dnl   # if  > 32
      dnl   # endif
      dnl   #endif
      result=0
    fi
    GLTYPE=`echo "$gltype" | tr 'abcdefghijklmnopqrstuvwxyz ' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ_'`
    AC_DEFINE_UNQUOTED([BITSIZEOF_${GLTYPE}], [$result])
    eval BITSIZEOF_${GLTYPE}=\$result
  done
  AC_FOREACH([gltype], [$1],
    [AC_SUBST([BITSIZEOF_]translit(gltype,[abcdefghijklmnopqrstuvwxyz ],[ABCDEFGHIJKLMNOPQRSTUVWXYZ_]))])
])

dnl gl_CHECK_TYPES_SIGNED(TYPES, INCLUDES)
dnl Determine the signedness of each of the given types.
dnl Define HAVE_SIGNED_TYPE if type is signed.
AC_DEFUN([gl_CHECK_TYPES_SIGNED],
[
  dnl Use a shell loop, to avoid bloating configure, and
  dnl - extra AH_TEMPLATE calls, so that autoheader knows what to put into
  dnl   config.h.in,
  dnl - extra AC_SUBST calls, so that the right substitutions are made.
  AC_FOREACH([gltype], [$1],
    [AH_TEMPLATE([HAVE_SIGNED_]translit(gltype,[abcdefghijklmnopqrstuvwxyz ],[ABCDEFGHIJKLMNOPQRSTUVWXYZ_]),
       [Define to 1 if ']gltype[' is a signed integer type.])])
  for gltype in $1 ; do
    AC_CACHE_CHECK([whether $gltype is signed], [gl_cv_type_${gltype}_signed],
      [AC_COMPILE_IFELSE(
         [AC_LANG_PROGRAM([$2[
            int verify[2 * (($gltype) -1 < ($gltype) 0) - 1];]])],
         result=yes, result=no)
       eval gl_cv_type_${gltype}_signed=\$result
      ])
    eval result=\$gl_cv_type_${gltype}_signed
    GLTYPE=`echo $gltype | tr 'abcdefghijklmnopqrstuvwxyz ' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ_'`
    if test "$result" = yes; then
      AC_DEFINE_UNQUOTED([HAVE_SIGNED_${GLTYPE}], 1)
      eval HAVE_SIGNED_${GLTYPE}=1
    else
      eval HAVE_SIGNED_${GLTYPE}=0
    fi
  done
  AC_FOREACH([gltype], [$1],
    [AC_SUBST([HAVE_SIGNED_]translit(gltype,[abcdefghijklmnopqrstuvwxyz ],[ABCDEFGHIJKLMNOPQRSTUVWXYZ_]))])
])

dnl gl_INTEGER_TYPE_SUFFIX(TYPES, INCLUDES)
dnl Determine the suffix to use for integer constants of the given types.
dnl Define t_SUFFIX for each such type.
AC_DEFUN([gl_INTEGER_TYPE_SUFFIX],
[
  dnl Use a shell loop, to avoid bloating configure, and
  dnl - extra AH_TEMPLATE calls, so that autoheader knows what to put into
  dnl   config.h.in,
  dnl - extra AC_SUBST calls, so that the right substitutions are made.
  AC_FOREACH([gltype], [$1],
    [AH_TEMPLATE(translit(gltype,[abcdefghijklmnopqrstuvwxyz ],[ABCDEFGHIJKLMNOPQRSTUVWXYZ_])[_SUFFIX],
       [Define to l, ll, u, ul, ull, etc., as suitable for
	constants of type ']gltype['.])])
  for gltype in $1 ; do
    AC_CACHE_CHECK([for $gltype integer literal suffix],
      [gl_cv_type_${gltype}_suffix],
      [eval gl_cv_type_${gltype}_suffix=no
       eval result=\$gl_cv_type_${gltype}_signed
       if test "$result" = yes; then
	 glsufu=
       else
	 glsufu=u
       fi
       for glsuf in "$glsufu" ${glsufu}l ${glsufu}ll ${glsufu}i64; do
	 case $glsuf in
	   '')  gltype1='int';;
	   l)	gltype1='long int';;
	   ll)	gltype1='long long int';;
	   i64)	gltype1='__int64';;
	   u)	gltype1='unsigned int';;
	   ul)	gltype1='unsigned long int';;
	   ull)	gltype1='unsigned long long int';;
	   ui64)gltype1='unsigned __int64';;
	 esac
	 AC_COMPILE_IFELSE(
	   [AC_LANG_PROGRAM([$2
	      extern $gltype foo;
	      extern $gltype1 foo;])],
	   [eval gl_cv_type_${gltype}_suffix=\$glsuf])
	 eval test \"\$gl_cv_type_${gltype}_suffix\" != no && break
       done])
    GLTYPE=`echo $gltype | tr 'abcdefghijklmnopqrstuvwxyz ' 'ABCDEFGHIJKLMNOPQRSTUVWXYZ_'`
    eval result=\$gl_cv_type_${gltype}_suffix
    test "$result" = no && result=
    eval ${GLTYPE}_SUFFIX=\$result
    AC_DEFINE_UNQUOTED([${GLTYPE}_SUFFIX], $result)
  done
  AC_FOREACH([gltype], [$1],
    [AC_SUBST(translit(gltype,[abcdefghijklmnopqrstuvwxyz ],[ABCDEFGHIJKLMNOPQRSTUVWXYZ_])[_SUFFIX])])
])

dnl gl_STDINT_INCLUDES
AC_DEFUN([gl_STDINT_INCLUDES],
[[
  #include <stddef.h>
  #include <signal.h>
  #if HAVE_WCHAR_H
    /* BSD/OS 4.1 has a bug: <stdio.h> and <time.h> must be included before
       <wchar.h>.  */
  # include <stdio.h>
  # include <time.h>
  # include <wchar.h>
  #endif
]])

dnl gl_STDINT_TYPE_PROPERTIES
dnl Compute HAVE_SIGNED_t, BITSIZEOF_t and t_SUFFIX, for all the types t
dnl of interest to stdint_.h.
AC_DEFUN([gl_STDINT_TYPE_PROPERTIES],
[
  gl_STDINT_BITSIZEOF([ptrdiff_t sig_atomic_t size_t wchar_t wint_t],
    [gl_STDINT_INCLUDES])
  gl_CHECK_TYPES_SIGNED([sig_atomic_t wchar_t wint_t],
    [gl_STDINT_INCLUDES])
  gl_cv_type_ptrdiff_t_signed=yes
  gl_cv_type_size_t_signed=no
  gl_INTEGER_TYPE_SUFFIX([ptrdiff_t sig_atomic_t size_t wchar_t wint_t],
    [gl_STDINT_INCLUDES])
])