1 # inttypes.m4 serial 21
2 dnl Copyright (C) 2006-2011 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_HEADERS_ONCE([inttypes.h])
15 AC_CHECK_DECLS_ONCE([strtoimax])
16 AC_CHECK_DECLS_ONCE([strtoumax])
18 dnl Override <inttypes.h> always, so that the portability warnings work.
19 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
20 gl_CHECK_NEXT_HEADERS([inttypes.h])
22 AC_REQUIRE([gl_MULTIARCH])
24 dnl Ensure that <stdint.h> defines the limit macros, since gnulib's
25 dnl <inttypes.h> relies on them. This macro is only needed when a
26 dnl C++ compiler is in use; it has no effect for a C compiler.
27 dnl Also be careful to define __STDC_LIMIT_MACROS only when gnulib's
28 dnl <inttypes.h> is going to be created, and to avoid redefinition warnings
29 dnl if the __STDC_LIMIT_MACROS is already defined through the CPPFLAGS.
30 AC_DEFINE([GL_TRIGGER_STDC_LIMIT_MACROS], [1],
31 [Define to make the limit macros in <stdint.h> visible.])
32 AH_VERBATIM([__STDC_LIMIT_MACROS_ZZZ],
33 [/* Ensure that <stdint.h> defines the limit macros, since gnulib's
34 <inttypes.h> relies on them. */
35 #if defined __cplusplus && !defined __STDC_LIMIT_MACROS && GL_TRIGGER_STDC_LIMIT_MACROS
36 # define __STDC_LIMIT_MACROS 1
41 if test -n "$STDINT_H"; then
42 dnl Using the gnulib <stdint.h>. It always defines intptr_t to 'long'.
45 dnl Using the system's <stdint.h>.
46 for glpfx in '' l ll I64; do
49 l) gltype1='long int';;
50 ll) gltype1='long long int';;
51 I64) gltype1='__int64';;
54 [AC_LANG_PROGRAM([[#include <stdint.h>
56 extern $gltype1 foo;]])],
57 [PRIPTR_PREFIX='"'$glpfx'"'])
58 test -n "$PRIPTR_PREFIX" && break
61 AC_SUBST([PRIPTR_PREFIX])
63 if test "$ac_cv_have_decl_strtoimax" = yes; then
69 if test "$ac_cv_have_decl_strtoumax" = yes; then
75 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
76 [INT32_MAX_LT_INTMAX_MAX],
77 [defined INT32_MAX && defined INTMAX_MAX],
78 [INT32_MAX < INTMAX_MAX],
79 [sizeof (int) < sizeof (long long int)])
80 if test $APPLE_UNIVERSAL_BUILD = 0; then
81 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
82 [INT64_MAX_EQ_LONG_MAX],
84 [INT64_MAX == LONG_MAX],
85 [sizeof (long long int) == sizeof (long int)])
87 INT64_MAX_EQ_LONG_MAX=-1
89 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
90 [UINT32_MAX_LT_UINTMAX_MAX],
91 [defined UINT32_MAX && defined UINTMAX_MAX],
92 [UINT32_MAX < UINTMAX_MAX],
93 [sizeof (unsigned int) < sizeof (unsigned long long int)])
94 if test $APPLE_UNIVERSAL_BUILD = 0; then
95 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
96 [UINT64_MAX_EQ_ULONG_MAX],
98 [UINT64_MAX == ULONG_MAX],
99 [sizeof (unsigned long long int) == sizeof (unsigned long int)])
101 UINT64_MAX_EQ_ULONG_MAX=-1
104 dnl Check for declarations of anything we want to poison if the
105 dnl corresponding gnulib module is not in use.
106 gl_WARN_ON_USE_PREPARE([[#include <inttypes.h>
107 ]], [imaxabs imaxdiv strtoimax strtoumax])
110 # Define the symbol $1 to be 1 if the condition is true, 0 otherwise.
111 # If $2 is true, the condition is $3; otherwise if long long int is supported
112 # approximate the condition with $4; otherwise, assume the condition is false.
113 # The condition should work on all C99 platforms; the approximations should be
114 # good enough to work on all practical pre-C99 platforms.
115 # $2 is evaluated by the C preprocessor, $3 and $4 as compile-time constants.
116 AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
118 AC_CACHE_CHECK([whether $3],
122 [[/* Work also in C++ mode. */
123 #define __STDC_LIMIT_MACROS 1
125 /* Work if build is not clean. */
126 #define _GL_JUST_INCLUDE_SYSTEM_STDINT_H
134 #define CONDITION ($3)
135 #elif HAVE_LONG_LONG_INT
136 #define CONDITION ($4)
140 int test[CONDITION ? 1 : -1];]])],
142 [gl_cv_test_$1=no])])
143 if test $gl_cv_test_$1 = yes; then
151 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
153 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
154 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
155 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
158 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
160 GNULIB_IMAXABS=0; AC_SUBST([GNULIB_IMAXABS])
161 GNULIB_IMAXDIV=0; AC_SUBST([GNULIB_IMAXDIV])
162 GNULIB_STRTOIMAX=0; AC_SUBST([GNULIB_STRTOIMAX])
163 GNULIB_STRTOUMAX=0; AC_SUBST([GNULIB_STRTOUMAX])
164 dnl Assume proper GNU behavior unless another module says otherwise.
165 HAVE_DECL_IMAXABS=1; AC_SUBST([HAVE_DECL_IMAXABS])
166 HAVE_DECL_IMAXDIV=1; AC_SUBST([HAVE_DECL_IMAXDIV])
167 HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
168 HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])