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author Karl Berry <karl@freefriends.org>
date Fri, 16 Aug 2013 06:32:22 -0700 (2013-08-16)
parents e542fd46ad6f
children
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1 # inttypes.m4 serial 26
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2 dnl Copyright (C) 2006-2013 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl From Derek Price, Bruno Haible.
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8 dnl Test whether <inttypes.h> is supported or must be substituted.
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9
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10 AC_DEFUN([gl_INTTYPES_H],
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11 [
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12 AC_REQUIRE([gl_INTTYPES_INCOMPLETE])
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13 gl_INTTYPES_PRI_SCN
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14 ])
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15
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16 AC_DEFUN_ONCE([gl_INTTYPES_INCOMPLETE],
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17 [
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18 AC_REQUIRE([gl_STDINT_H])
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19 AC_CHECK_HEADERS_ONCE([inttypes.h])
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20
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21 dnl Override <inttypes.h> always, so that the portability warnings work.
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22 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
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23 gl_CHECK_NEXT_HEADERS([inttypes.h])
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24
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25 AC_REQUIRE([gl_MULTIARCH])
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26
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27 dnl Check for declarations of anything we want to poison if the
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28 dnl corresponding gnulib module is not in use.
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29 gl_WARN_ON_USE_PREPARE([[#include <inttypes.h>
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30 ]], [imaxabs imaxdiv strtoimax strtoumax])
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31 ])
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32
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33 # Ensure that the PRI* and SCN* macros are defined appropriately.
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34 AC_DEFUN([gl_INTTYPES_PRI_SCN],
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35 [
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36 AC_REQUIRE([gt_INTTYPES_PRI])
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37
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38 PRIPTR_PREFIX=
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39 if test -n "$STDINT_H"; then
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40 dnl Using the gnulib <stdint.h>. It always defines intptr_t to 'long'.
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41 PRIPTR_PREFIX='"l"'
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42 else
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43 dnl Using the system's <stdint.h>.
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44 for glpfx in '' l ll I64; do
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45 case $glpfx in
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46 '') gltype1='int';;
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47 l) gltype1='long int';;
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48 ll) gltype1='long long int';;
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49 I64) gltype1='__int64';;
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50 esac
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51 AC_COMPILE_IFELSE(
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52 [AC_LANG_PROGRAM([[#include <stdint.h>
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53 extern intptr_t foo;
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54 extern $gltype1 foo;]])],
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55 [PRIPTR_PREFIX='"'$glpfx'"'])
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56 test -n "$PRIPTR_PREFIX" && break
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57 done
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58 fi
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59 AC_SUBST([PRIPTR_PREFIX])
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60
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61 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
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62 [INT32_MAX_LT_INTMAX_MAX],
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63 [defined INT32_MAX && defined INTMAX_MAX],
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64 [INT32_MAX < INTMAX_MAX],
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65 [sizeof (int) < sizeof (long long int)])
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66 if test $APPLE_UNIVERSAL_BUILD = 0; then
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67 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
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68 [INT64_MAX_EQ_LONG_MAX],
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69 [defined INT64_MAX],
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70 [INT64_MAX == LONG_MAX],
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71 [sizeof (long long int) == sizeof (long int)])
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72 else
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73 INT64_MAX_EQ_LONG_MAX=-1
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74 fi
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75 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
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76 [UINT32_MAX_LT_UINTMAX_MAX],
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77 [defined UINT32_MAX && defined UINTMAX_MAX],
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78 [UINT32_MAX < UINTMAX_MAX],
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79 [sizeof (unsigned int) < sizeof (unsigned long long int)])
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80 if test $APPLE_UNIVERSAL_BUILD = 0; then
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81 gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION(
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82 [UINT64_MAX_EQ_ULONG_MAX],
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83 [defined UINT64_MAX],
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84 [UINT64_MAX == ULONG_MAX],
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85 [sizeof (unsigned long long int) == sizeof (unsigned long int)])
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86 else
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87 UINT64_MAX_EQ_ULONG_MAX=-1
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88 fi
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89 ])
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90
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91 # Define the symbol $1 to be 1 if the condition is true, 0 otherwise.
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92 # If $2 is true, the condition is $3; otherwise if long long int is supported
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93 # approximate the condition with $4; otherwise, assume the condition is false.
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94 # The condition should work on all C99 platforms; the approximations should be
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95 # good enough to work on all practical pre-C99 platforms.
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96 # $2 is evaluated by the C preprocessor, $3 and $4 as compile-time constants.
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97 AC_DEFUN([gl_INTTYPES_CHECK_LONG_LONG_INT_CONDITION],
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98 [
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99 AC_CACHE_CHECK([whether $3],
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100 [gl_cv_test_$1],
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101 [AC_COMPILE_IFELSE(
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102 [AC_LANG_PROGRAM(
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103 [[/* Work also in C++ mode. */
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104 #define __STDC_LIMIT_MACROS 1
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105
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106 /* Work if build is not clean. */
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107 #define _GL_JUST_INCLUDE_SYSTEM_STDINT_H
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108
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109 #include <limits.h>
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110 #if HAVE_STDINT_H
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111 #include <stdint.h>
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112 #endif
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113
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114 #if $2
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115 #define CONDITION ($3)
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116 #elif HAVE_LONG_LONG_INT
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117 #define CONDITION ($4)
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118 #else
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119 #define CONDITION 0
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120 #endif
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121 int test[CONDITION ? 1 : -1];]])],
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122 [gl_cv_test_$1=yes],
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123 [gl_cv_test_$1=no])])
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124 if test $gl_cv_test_$1 = yes; then
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125 $1=1;
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126 else
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127 $1=0;
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128 fi
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129 AC_SUBST([$1])
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130 ])
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131
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132 AC_DEFUN([gl_INTTYPES_MODULE_INDICATOR],
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133 [
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134 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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135 AC_REQUIRE([gl_INTTYPES_H_DEFAULTS])
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136 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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137 ])
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138
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139 AC_DEFUN([gl_INTTYPES_H_DEFAULTS],
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140 [
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141 GNULIB_IMAXABS=0; AC_SUBST([GNULIB_IMAXABS])
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142 GNULIB_IMAXDIV=0; AC_SUBST([GNULIB_IMAXDIV])
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143 GNULIB_STRTOIMAX=0; AC_SUBST([GNULIB_STRTOIMAX])
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144 GNULIB_STRTOUMAX=0; AC_SUBST([GNULIB_STRTOUMAX])
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145 dnl Assume proper GNU behavior unless another module says otherwise.
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146 HAVE_DECL_IMAXABS=1; AC_SUBST([HAVE_DECL_IMAXABS])
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147 HAVE_DECL_IMAXDIV=1; AC_SUBST([HAVE_DECL_IMAXDIV])
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148 HAVE_DECL_STRTOIMAX=1; AC_SUBST([HAVE_DECL_STRTOIMAX])
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149 HAVE_DECL_STRTOUMAX=1; AC_SUBST([HAVE_DECL_STRTOUMAX])
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150 REPLACE_STRTOIMAX=0; AC_SUBST([REPLACE_STRTOIMAX])
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151 INT32_MAX_LT_INTMAX_MAX=1; AC_SUBST([INT32_MAX_LT_INTMAX_MAX])
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152 INT64_MAX_EQ_LONG_MAX='defined _LP64'; AC_SUBST([INT64_MAX_EQ_LONG_MAX])
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153 PRI_MACROS_BROKEN=0; AC_SUBST([PRI_MACROS_BROKEN])
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154 PRIPTR_PREFIX=__PRIPTR_PREFIX; AC_SUBST([PRIPTR_PREFIX])
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155 UINT32_MAX_LT_UINTMAX_MAX=1; AC_SUBST([UINT32_MAX_LT_UINTMAX_MAX])
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156 UINT64_MAX_EQ_ULONG_MAX='defined _LP64'; AC_SUBST([UINT64_MAX_EQ_ULONG_MAX])
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157 ])