1 # inttypes.m4 serial 36
2 dnl Copyright (C) 2006-2023 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_ONCE([gl_INTTYPES_H],
12 AC_REQUIRE([gl_INTTYPES_INCOMPLETE])
16 AC_DEFUN_ONCE([gl_INTTYPES_INCOMPLETE],
18 AC_REQUIRE([gl_STDINT_H])
19 AC_CHECK_HEADERS_ONCE([inttypes.h])
21 dnl Override <inttypes.h> always, so that the portability warnings work.
22 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
23 gl_CHECK_NEXT_HEADERS([inttypes.h])
25 AC_REQUIRE([gl_MULTIARCH])
27 dnl Check for declarations of anything we want to poison if the
28 dnl corresponding gnulib module is not in use.
29 gl_WARN_ON_USE_PREPARE([[#include <inttypes.h>
30 ]], [imaxabs imaxdiv strtoimax strtoumax])
32 AC_REQUIRE([AC_C_RESTRICT])
35 # Ensure that the PRI* and SCN* macros are defined appropriately.
36 AC_DEFUN([gl_INTTYPES_PRI_SCN],
39 if $GL_GENERATE_STDINT_H; then
40 dnl Using the gnulib <stdint.h>. It defines intptr_t to 'long' or
41 dnl 'long long', depending on _WIN64.
49 [PRIPTR_PREFIX='"l"'],
50 [PRIPTR_PREFIX='"ll"'])
52 dnl Using the system's <stdint.h>.
53 for glpfx in '' l ll I64; do
56 l) gltype1='long int';;
57 ll) gltype1='long long int';;
58 I64) gltype1='__int64';;
61 [AC_LANG_PROGRAM([[#include <stdint.h>
63 extern $gltype1 foo;]])],
64 [PRIPTR_PREFIX='"'$glpfx'"'])
65 test -n "$PRIPTR_PREFIX" && break
68 AC_SUBST([PRIPTR_PREFIX])
70 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
71 [INT32_MAX_LT_INTMAX_MAX],
72 [defined INT32_MAX && defined INTMAX_MAX],
73 [INT32_MAX < INTMAX_MAX],
74 [sizeof (int) < sizeof (long long int)])
75 if test $APPLE_UNIVERSAL_BUILD = 0; then
76 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
77 [INT64_MAX_EQ_LONG_MAX],
79 [INT64_MAX == LONG_MAX],
80 [sizeof (long long int) == sizeof (long int)])
82 INT64_MAX_EQ_LONG_MAX=-1
84 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
85 [UINT32_MAX_LT_UINTMAX_MAX],
86 [defined UINT32_MAX && defined UINTMAX_MAX],
87 [UINT32_MAX < UINTMAX_MAX],
88 [sizeof (unsigned int) < sizeof (unsigned long long int)])
89 if test $APPLE_UNIVERSAL_BUILD = 0; then
90 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
91 [UINT64_MAX_EQ_ULONG_MAX],
93 [UINT64_MAX == ULONG_MAX],
94 [sizeof (unsigned long long int) == sizeof (unsigned long int)])
96 UINT64_MAX_EQ_ULONG_MAX=-1
100 # Define the symbol $1 to be 1 if the condition is true, 0 otherwise.
101 # If $2 is true, the condition is $3; otherwise if long long int is supported
102 # approximate the condition with $4; otherwise, assume the condition is false.
103 # The condition should work on all C99 platforms; the approximations should be
104 # good enough to work on all practical pre-C99 platforms.
105 # $2 is evaluated by the C preprocessor, $3 and $4 as compile-time constants.
106 AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
108 AC_CACHE_CHECK([whether $3],
112 [[/* Work also in C++ mode. */
113 #define __STDC_LIMIT_MACROS 1
115 /* Work if build is not clean. */
116 #define _GL_JUST_INCLUDE_SYSTEM_STDINT_H
124 #define CONDITION ($3)
126 #define CONDITION ($4)
128 int test[CONDITION ? 1 : -1];]])],
130 [gl_cv_test_$1=no])])
131 if test $gl_cv_test_$1 = yes; then
139 # gl_INTTYPES_MODULE_INDICATOR([modulename])
140 # sets the shell variable that indicates the presence of the given module
141 # to a C preprocessor expression that will evaluate to 1.
142 # This macro invocation must not occur in macros that are AC_REQUIREd.
143 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
145 dnl Ensure to expand the default settings once only.
146 gl_INTTYPES_H_REQUIRE_DEFAULTS
147 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
150 # Initializes the default values for AC_SUBSTed shell variables.
151 # This macro must not be AC_REQUIREd. It must only be invoked, and only
152 # outside of macros or in macros that are not AC_REQUIREd.
153 AC_DEFUN([gl_INTTYPES_H_REQUIRE_DEFAULTS],
155 m4_defun(GL_MODULE_INDICATOR_PREFIX[_INTTYPES_H_MODULE_INDICATOR_DEFAULTS], [
156 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_IMAXABS])
157 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_IMAXDIV])
158 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOIMAX])
159 gl_MODULE_INDICATOR_INIT_VARIABLE([GNULIB_STRTOUMAX])
161 m4_require(GL_MODULE_INDICATOR_PREFIX[_INTTYPES_H_MODULE_INDICATOR_DEFAULTS])
162 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
165 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
167 dnl Assume proper GNU behavior unless another module says otherwise.
168 HAVE_DECL_IMAXABS=1; AC_SUBST([HAVE_DECL_IMAXABS])
169 HAVE_DECL_IMAXDIV=1; AC_SUBST([HAVE_DECL_IMAXDIV])
170 HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
171 HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])
172 HAVE_IMAXDIV_T=1; AC_SUBST([HAVE_IMAXDIV_T])
173 REPLACE_STRTOIMAX=0; AC_SUBST([REPLACE_STRTOIMAX])
174 REPLACE_STRTOUMAX=0; AC_SUBST([REPLACE_STRTOUMAX])
175 INT32_MAX_LT_INTMAX_MAX=1; AC_SUBST([INT32_MAX_LT_INTMAX_MAX])
176 INT64_MAX_EQ_LONG_MAX='defined _LP64'; AC_SUBST([INT64_MAX_EQ_LONG_MAX])
177 PRIPTR_PREFIX=__PRIPTR_PREFIX; AC_SUBST([PRIPTR_PREFIX])
178 UINT32_MAX_LT_UINTMAX_MAX=1; AC_SUBST([UINT32_MAX_LT_UINTMAX_MAX])
179 UINT64_MAX_EQ_ULONG_MAX='defined _LP64'; AC_SUBST([UINT64_MAX_EQ_ULONG_MAX])