1 # inttypes.m4 serial 11
2 dnl Copyright (C) 2006-2007 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 dnl From Derek Price, Bruno Haible.
8 dnl Test whether <inttypes.h> is supported or must be substituted.
10 AC_DEFUN([gl_INTTYPES_H],
12 AC_REQUIRE([gl_STDINT_H])
13 AC_REQUIRE([gt_INTTYPES_PRI])
14 AC_CHECK_DECLS_ONCE([imaxabs])
15 AC_CHECK_DECLS_ONCE([imaxdiv])
16 AC_CHECK_DECLS_ONCE([strtoimax])
17 AC_CHECK_DECLS_ONCE([strtoumax])
19 dnl Now see if we need a substitute <inttypes.h>.
20 dnl A complete <inttypes.h> requires
21 dnl - a complete <stdint.h>,
22 dnl - the existence of an <inttypes.h>,
23 dnl - that imaxabs, imaxdiv, strtoimax, strtoumax are declared,
24 dnl - some additional tests.
25 AC_CACHE_CHECK([whether inttypes.h conforms to C99],
26 [gl_cv_header_working_inttypes_h],
27 [gl_cv_header_working_inttypes_h=no
28 if test "$gl_cv_header_working_stdint_h" = yes \
29 && test $ac_cv_header_inttypes_h = yes \
30 && test "$ac_cv_have_decl_imaxabs" = yes \
31 && test "$ac_cv_have_decl_imaxdiv" = yes \
32 && test "$ac_cv_have_decl_strtoimax" = yes \
33 && test "$ac_cv_have_decl_strtoumax" = yes; then
37 #define __STDC_LIMIT_MACROS 1 /* to make it work also in C++ mode */
38 #define __STDC_CONSTANT_MACROS 1 /* to make it work also in C++ mode */
39 #define __STDC_FORMAT_MACROS 1 /* to make it work also in C++ mode */
40 #define _GL_JUST_INCLUDE_SYSTEM_INTTYPES_H /* work if build isn't clean */
43 /* No need to duplicate the tests of stdint.m4; they are subsumed by
44 $gl_cv_header_working_stdint_h = yes. */
46 /* Tests for macros supposed to be defined in inttypes.h. */
48 const char *k = /* implicit string concatenation */
53 PRIo8 PRIu8 PRIx8 PRIX8
59 PRIo16 PRIu16 PRIx16 PRIX16
65 PRIo32 PRIu32 PRIx32 PRIX32
71 PRIo64 PRIu64 PRIx64 PRIX64
73 PRIdLEAST8 PRIiLEAST8 PRIoLEAST8 PRIuLEAST8 PRIxLEAST8 PRIXLEAST8
74 PRIdLEAST16 PRIiLEAST16 PRIoLEAST16 PRIuLEAST16 PRIxLEAST16 PRIXLEAST16
75 PRIdLEAST32 PRIiLEAST32 PRIoLEAST32 PRIuLEAST32 PRIxLEAST32 PRIXLEAST32
76 PRIdLEAST64 PRIiLEAST64
77 PRIoLEAST64 PRIuLEAST64 PRIxLEAST64 PRIXLEAST64
78 PRIdFAST8 PRIiFAST8 PRIoFAST8 PRIuFAST8 PRIxFAST8 PRIXFAST8
79 PRIdFAST16 PRIiFAST16 PRIoFAST16 PRIuFAST16 PRIxFAST16 PRIXFAST16
80 PRIdFAST32 PRIiFAST32 PRIoFAST32 PRIuFAST32 PRIxFAST32 PRIXFAST32
82 PRIoFAST64 PRIuFAST64 PRIxFAST64 PRIXFAST64
83 PRIdMAX PRIiMAX PRIoMAX PRIuMAX PRIxMAX PRIXMAX
88 PRIoPTR PRIuPTR PRIxPTR PRIXPTR
91 const char *l = /* implicit string concatenation */
116 SCNdLEAST8 SCNiLEAST8 SCNoLEAST8 SCNuLEAST8 SCNxLEAST8
117 SCNdLEAST16 SCNiLEAST16 SCNoLEAST16 SCNuLEAST16 SCNxLEAST16
118 SCNdLEAST32 SCNiLEAST32 SCNoLEAST32 SCNuLEAST32 SCNxLEAST32
119 SCNdLEAST64 SCNiLEAST64
120 SCNoLEAST64 SCNuLEAST64 SCNxLEAST64
121 SCNdFAST8 SCNiFAST8 SCNoFAST8 SCNuFAST8 SCNxFAST8
122 SCNdFAST16 SCNiFAST16 SCNoFAST16 SCNuFAST16 SCNxFAST16
123 SCNdFAST32 SCNiFAST32 SCNoFAST32 SCNuFAST32 SCNxFAST32
124 SCNdFAST64 SCNiFAST64
125 SCNoFAST64 SCNuFAST64 SCNxFAST64
126 SCNdMAX SCNiMAX SCNoMAX SCNuMAX SCNxMAX
131 SCNoPTR SCNuPTR SCNxPTR
135 [gl_cv_header_working_inttypes_h=yes])
138 dnl Override <inttypes.h> always, so that the portability warnings work.
139 if false && test $gl_cv_header_working_inttypes_h = yes; then
140 dnl Use the existing <inttypes.h>.
144 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
145 gl_CHECK_NEXT_HEADERS([inttypes.h])
147 dnl Ensure that <stdint.h> defines the limit macros, since gnulib's
148 dnl <inttypes.h> relies on them. This macro is only needed when a
149 dnl C++ compiler is in use; it has no effect for a C compiler.
150 dnl Also be careful to define __STDC_LIMIT_MACROS only when gnulib's
151 dnl <inttypes.h> is going to be created, and to avoid redefinition warnings
152 dnl if the __STDC_LIMIT_MACROS is already defined through the CPPFLAGS.
153 AC_DEFINE([GL_TRIGGER_STDC_LIMIT_MACROS], 1,
154 [Define to make the limit macros in <stdint.h> visible.])
155 AH_VERBATIM([__STDC_LIMIT_MACROS_ZZZ],
156 [/* Ensure that <stdint.h> defines the limit macros, since gnulib's
157 <inttypes.h> relies on them. */
158 #if defined __cplusplus && !defined __STDC_LIMIT_MACROS && GL_TRIGGER_STDC_LIMIT_MACROS
159 # define __STDC_LIMIT_MACROS 1
164 if test -n "$STDINT_H"; then
165 dnl Using the gnulib <stdint.h>. It always defines intptr_t to 'long'.
168 dnl Using the system's <stdint.h>.
169 for glpfx in '' l ll I64; do
172 l) gltype1='long int';;
173 ll) gltype1='long long int';;
174 I64) gltype1='__int64';;
177 [AC_LANG_PROGRAM([#include <stdint.h>
179 extern $gltype1 foo;])],
180 [PRIPTR_PREFIX='"'$glpfx'"'])
181 test -n "$PRIPTR_PREFIX" && break
184 AC_SUBST([PRIPTR_PREFIX])
186 if test "$ac_cv_have_decl_imaxabs" = yes; then
192 if test "$ac_cv_have_decl_imaxdiv" = yes; then
198 if test "$ac_cv_have_decl_strtoimax" = yes; then
199 HAVE_DECL_STRTOIMAX=1
201 HAVE_DECL_STRTOIMAX=0
204 if test "$ac_cv_have_decl_strtoumax" = yes; then
205 HAVE_DECL_STRTOUMAX=1
207 HAVE_DECL_STRTOUMAX=0
210 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
211 [INT32_MAX_LT_INTMAX_MAX],
212 [defined INT32_MAX && defined INTMAX_MAX],
213 [INT32_MAX < INTMAX_MAX],
214 [sizeof (int) < sizeof (long long int)])
215 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
216 [INT64_MAX_EQ_LONG_MAX],
218 [INT64_MAX == LONG_MAX],
219 [sizeof (long long int) == sizeof (long int)])
220 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
221 [UINT32_MAX_LT_UINTMAX_MAX],
222 [defined UINT32_MAX && defined UINTMAX_MAX],
223 [UINT32_MAX < UINTMAX_MAX],
224 [sizeof (unsigned int) < sizeof (unsigned long long int)])
225 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
226 [UINT64_MAX_EQ_ULONG_MAX],
227 [defined UINT64_MAX],
228 [UINT64_MAX == ULONG_MAX],
229 [sizeof (unsigned long long int) == sizeof (unsigned long int)])
231 INTTYPES_H='inttypes.h'
236 # Define the symbol $1 to be 1 if the condition is true, 0 otherwise.
237 # If $2 is true, the condition is $3; otherwise if long long int is supported
238 # approximate the condition with $4; otherwise, assume the condition is false.
239 # The condition should work on all C99 platforms; the approximations should be
240 # good enough to work on all practical pre-C99 platforms.
241 # $2 is evaluated by the C preprocessor, $3 and $4 as compile-time constants.
242 AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
244 AC_CACHE_CHECK([whether $3],
248 [[/* Work also in C++ mode. */
249 #define __STDC_LIMIT_MACROS 1
251 /* Work if build is not clean. */
252 #define _GL_JUST_INCLUDE_SYSTEM_STDINT_H
260 #define CONDITION ($3)
261 #elif HAVE_LONG_LONG_INT
262 #define CONDITION ($4)
266 int test[CONDITION ? 1 : -1];]])],
268 [gl_cv_test_$1=no])])
269 if test $gl_cv_test_$1 = yes; then
277 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
279 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
280 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
281 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
284 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
286 GNULIB_IMAXABS=0; AC_SUBST([GNULIB_IMAXABS])
287 GNULIB_IMAXDIV=0; AC_SUBST([GNULIB_IMAXDIV])
288 GNULIB_STRTOIMAX=0; AC_SUBST([GNULIB_STRTOIMAX])
289 GNULIB_STRTOUMAX=0; AC_SUBST([GNULIB_STRTOUMAX])
290 dnl Assume proper GNU behavior unless another module says otherwise.
291 HAVE_DECL_IMAXABS=1; AC_SUBST([HAVE_DECL_IMAXABS])
292 HAVE_DECL_IMAXDIV=1; AC_SUBST([HAVE_DECL_IMAXDIV])
293 HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
294 HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])