1 # inttypes.m4 serial 19
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([imaxabs])
16 AC_CHECK_DECLS_ONCE([imaxdiv])
17 AC_CHECK_DECLS_ONCE([strtoimax])
18 AC_CHECK_DECLS_ONCE([strtoumax])
20 dnl Override <inttypes.h> always, so that the portability warnings work.
21 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
22 gl_CHECK_NEXT_HEADERS([inttypes.h])
24 AC_REQUIRE([gl_MULTIARCH])
26 dnl Ensure that <stdint.h> defines the limit macros, since gnulib's
27 dnl <inttypes.h> relies on them. This macro is only needed when a
28 dnl C++ compiler is in use; it has no effect for a C compiler.
29 dnl Also be careful to define __STDC_LIMIT_MACROS only when gnulib's
30 dnl <inttypes.h> is going to be created, and to avoid redefinition warnings
31 dnl if the __STDC_LIMIT_MACROS is already defined through the CPPFLAGS.
32 AC_DEFINE([GL_TRIGGER_STDC_LIMIT_MACROS], [1],
33 [Define to make the limit macros in <stdint.h> visible.])
34 AH_VERBATIM([__STDC_LIMIT_MACROS_ZZZ],
35 [/* Ensure that <stdint.h> defines the limit macros, since gnulib's
36 <inttypes.h> relies on them. */
37 #if defined __cplusplus && !defined __STDC_LIMIT_MACROS && GL_TRIGGER_STDC_LIMIT_MACROS
38 # define __STDC_LIMIT_MACROS 1
43 if test -n "$STDINT_H"; then
44 dnl Using the gnulib <stdint.h>. It always defines intptr_t to 'long'.
47 dnl Using the system's <stdint.h>.
48 for glpfx in '' l ll I64; do
51 l) gltype1='long int';;
52 ll) gltype1='long long int';;
53 I64) gltype1='__int64';;
56 [AC_LANG_PROGRAM([[#include <stdint.h>
58 extern $gltype1 foo;]])],
59 [PRIPTR_PREFIX='"'$glpfx'"'])
60 test -n "$PRIPTR_PREFIX" && break
63 AC_SUBST([PRIPTR_PREFIX])
65 if test "$ac_cv_have_decl_imaxabs" = yes; then
71 if test "$ac_cv_have_decl_imaxdiv" = yes; then
77 if test "$ac_cv_have_decl_strtoimax" = yes; then
83 if test "$ac_cv_have_decl_strtoumax" = yes; then
89 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
90 [INT32_MAX_LT_INTMAX_MAX],
91 [defined INT32_MAX && defined INTMAX_MAX],
92 [INT32_MAX < INTMAX_MAX],
93 [sizeof (int) < sizeof (long long int)])
94 if test $APPLE_UNIVERSAL_BUILD = 0; then
95 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
96 [INT64_MAX_EQ_LONG_MAX],
98 [INT64_MAX == LONG_MAX],
99 [sizeof (long long int) == sizeof (long int)])
101 INT64_MAX_EQ_LONG_MAX=-1
103 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
104 [UINT32_MAX_LT_UINTMAX_MAX],
105 [defined UINT32_MAX && defined UINTMAX_MAX],
106 [UINT32_MAX < UINTMAX_MAX],
107 [sizeof (unsigned int) < sizeof (unsigned long long int)])
108 if test $APPLE_UNIVERSAL_BUILD = 0; then
109 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
110 [UINT64_MAX_EQ_ULONG_MAX],
111 [defined UINT64_MAX],
112 [UINT64_MAX == ULONG_MAX],
113 [sizeof (unsigned long long int) == sizeof (unsigned long int)])
115 UINT64_MAX_EQ_ULONG_MAX=-1
118 dnl Check for declarations of anything we want to poison if the
119 dnl corresponding gnulib module is not in use.
120 gl_WARN_ON_USE_PREPARE([[#include <inttypes.h>
121 ]], [imaxabs imaxdiv strtoimax strtoumax])
124 # Define the symbol $1 to be 1 if the condition is true, 0 otherwise.
125 # If $2 is true, the condition is $3; otherwise if long long int is supported
126 # approximate the condition with $4; otherwise, assume the condition is false.
127 # The condition should work on all C99 platforms; the approximations should be
128 # good enough to work on all practical pre-C99 platforms.
129 # $2 is evaluated by the C preprocessor, $3 and $4 as compile-time constants.
130 AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
132 AC_CACHE_CHECK([whether $3],
136 [[/* Work also in C++ mode. */
137 #define __STDC_LIMIT_MACROS 1
139 /* Work if build is not clean. */
140 #define _GL_JUST_INCLUDE_SYSTEM_STDINT_H
148 #define CONDITION ($3)
149 #elif HAVE_LONG_LONG_INT
150 #define CONDITION ($4)
154 int test[CONDITION ? 1 : -1];]])],
156 [gl_cv_test_$1=no])])
157 if test $gl_cv_test_$1 = yes; then
165 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
167 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
168 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
169 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
172 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
174 GNULIB_IMAXABS=0; AC_SUBST([GNULIB_IMAXABS])
175 GNULIB_IMAXDIV=0; AC_SUBST([GNULIB_IMAXDIV])
176 GNULIB_STRTOIMAX=0; AC_SUBST([GNULIB_STRTOIMAX])
177 GNULIB_STRTOUMAX=0; AC_SUBST([GNULIB_STRTOUMAX])
178 dnl Assume proper GNU behavior unless another module says otherwise.
179 HAVE_DECL_IMAXABS=1; AC_SUBST([HAVE_DECL_IMAXABS])
180 HAVE_DECL_IMAXDIV=1; AC_SUBST([HAVE_DECL_IMAXDIV])
181 HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
182 HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])