1 # inttypes.m4 serial 22
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])
16 dnl Override <inttypes.h> always, so that the portability warnings work.
17 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
18 gl_CHECK_NEXT_HEADERS([inttypes.h])
20 AC_REQUIRE([gl_MULTIARCH])
22 dnl Ensure that <stdint.h> defines the limit macros, since gnulib's
23 dnl <inttypes.h> relies on them. This macro is only needed when a
24 dnl C++ compiler is in use; it has no effect for a C compiler.
25 dnl Also be careful to define __STDC_LIMIT_MACROS only when gnulib's
26 dnl <inttypes.h> is going to be created, and to avoid redefinition warnings
27 dnl if the __STDC_LIMIT_MACROS is already defined through the CPPFLAGS.
28 AC_DEFINE([GL_TRIGGER_STDC_LIMIT_MACROS], [1],
29 [Define to make the limit macros in <stdint.h> visible.])
30 AH_VERBATIM([__STDC_LIMIT_MACROS_ZZZ],
31 [/* Ensure that <stdint.h> defines the limit macros, since gnulib's
32 <inttypes.h> relies on them. */
33 #if defined __cplusplus && !defined __STDC_LIMIT_MACROS && GL_TRIGGER_STDC_LIMIT_MACROS
34 # define __STDC_LIMIT_MACROS 1
39 if test -n "$STDINT_H"; then
40 dnl Using the gnulib <stdint.h>. It always defines intptr_t to 'long'.
43 dnl Using the system's <stdint.h>.
44 for glpfx in '' l ll I64; do
47 l) gltype1='long int';;
48 ll) gltype1='long long int';;
49 I64) gltype1='__int64';;
52 [AC_LANG_PROGRAM([[#include <stdint.h>
54 extern $gltype1 foo;]])],
55 [PRIPTR_PREFIX='"'$glpfx'"'])
56 test -n "$PRIPTR_PREFIX" && break
59 AC_SUBST([PRIPTR_PREFIX])
61 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
62 [INT32_MAX_LT_INTMAX_MAX],
63 [defined INT32_MAX && defined INTMAX_MAX],
64 [INT32_MAX < INTMAX_MAX],
65 [sizeof (int) < sizeof (long long int)])
66 if test $APPLE_UNIVERSAL_BUILD = 0; then
67 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
68 [INT64_MAX_EQ_LONG_MAX],
70 [INT64_MAX == LONG_MAX],
71 [sizeof (long long int) == sizeof (long int)])
73 INT64_MAX_EQ_LONG_MAX=-1
75 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
76 [UINT32_MAX_LT_UINTMAX_MAX],
77 [defined UINT32_MAX && defined UINTMAX_MAX],
78 [UINT32_MAX < UINTMAX_MAX],
79 [sizeof (unsigned int) < sizeof (unsigned long long int)])
80 if test $APPLE_UNIVERSAL_BUILD = 0; then
81 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
82 [UINT64_MAX_EQ_ULONG_MAX],
84 [UINT64_MAX == ULONG_MAX],
85 [sizeof (unsigned long long int) == sizeof (unsigned long int)])
87 UINT64_MAX_EQ_ULONG_MAX=-1
90 dnl Check for declarations of anything we want to poison if the
91 dnl corresponding gnulib module is not in use.
92 gl_WARN_ON_USE_PREPARE([[#include <inttypes.h>
93 ]], [imaxabs imaxdiv strtoimax strtoumax])
96 # Define the symbol $1 to be 1 if the condition is true, 0 otherwise.
97 # If $2 is true, the condition is $3; otherwise if long long int is supported
98 # approximate the condition with $4; otherwise, assume the condition is false.
99 # The condition should work on all C99 platforms; the approximations should be
100 # good enough to work on all practical pre-C99 platforms.
101 # $2 is evaluated by the C preprocessor, $3 and $4 as compile-time constants.
102 AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
104 AC_CACHE_CHECK([whether $3],
108 [[/* Work also in C++ mode. */
109 #define __STDC_LIMIT_MACROS 1
111 /* Work if build is not clean. */
112 #define _GL_JUST_INCLUDE_SYSTEM_STDINT_H
120 #define CONDITION ($3)
121 #elif HAVE_LONG_LONG_INT
122 #define CONDITION ($4)
126 int test[CONDITION ? 1 : -1];]])],
128 [gl_cv_test_$1=no])])
129 if test $gl_cv_test_$1 = yes; then
137 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
139 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
140 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
141 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
144 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
146 GNULIB_IMAXABS=0; AC_SUBST([GNULIB_IMAXABS])
147 GNULIB_IMAXDIV=0; AC_SUBST([GNULIB_IMAXDIV])
148 GNULIB_STRTOIMAX=0; AC_SUBST([GNULIB_STRTOIMAX])
149 GNULIB_STRTOUMAX=0; AC_SUBST([GNULIB_STRTOUMAX])
150 dnl Assume proper GNU behavior unless another module says otherwise.
151 HAVE_DECL_IMAXABS=1; AC_SUBST([HAVE_DECL_IMAXABS])
152 HAVE_DECL_IMAXDIV=1; AC_SUBST([HAVE_DECL_IMAXDIV])
153 HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
154 HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])