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author Bruno Haible <bruno@clisp.org>
date Mon, 25 Jun 2018 21:45:23 +0200
parents 0b05f2be9830
children eb64273b66c2
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rev   line source
19596
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1 # gnulib-common.m4 serial 39
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2 dnl Copyright (C) 2007-2018 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 # gl_COMMON
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8 # is expanded unconditionally through gnulib-tool magic.
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9 AC_DEFUN([gl_COMMON], [
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10 dnl Use AC_REQUIRE here, so that the code is expanded once only.
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11 AC_REQUIRE([gl_00GNULIB])
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12 AC_REQUIRE([gl_COMMON_BODY])
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13 ])
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14 AC_DEFUN([gl_COMMON_BODY], [
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15 AH_VERBATIM([_Noreturn],
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16 [/* The _Noreturn keyword of C11. */
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17 #if ! (defined _Noreturn \
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18 || (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__))
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19 # if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \
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20 || 0x5110 <= __SUNPRO_C)
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21 # define _Noreturn __attribute__ ((__noreturn__))
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22 # elif defined _MSC_VER && 1200 <= _MSC_VER
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23 # define _Noreturn __declspec (noreturn)
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24 # else
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25 # define _Noreturn
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26 # endif
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27 #endif
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28 ])
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29 AH_VERBATIM([isoc99_inline],
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30 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
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31 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
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32 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
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33 __APPLE__ && __MACH__ test for Mac OS X.
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34 __APPLE_CC__ tests for the Apple compiler and its version.
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35 __STDC_VERSION__ tests for the C99 mode. */
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36 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
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37 # define __GNUC_STDC_INLINE__ 1
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38 #endif])
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39 AH_VERBATIM([unused_parameter],
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40 [/* Define as a marker that can be attached to declarations that might not
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41 be used. This helps to reduce warnings, such as from
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42 GCC -Wunused-parameter. */
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43 #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
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44 # define _GL_UNUSED __attribute__ ((__unused__))
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45 #else
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46 # define _GL_UNUSED
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47 #endif
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48 /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
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49 is a misnomer outside of parameter lists. */
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50 #define _UNUSED_PARAMETER_ _GL_UNUSED
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51
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52 /* gcc supports the "unused" attribute on possibly unused labels, and
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53 g++ has since version 4.5. Note to support C++ as well as C,
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54 _GL_UNUSED_LABEL should be used with a trailing ; */
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55 #if !defined __cplusplus || __GNUC__ > 4 \
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56 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
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57 # define _GL_UNUSED_LABEL _GL_UNUSED
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58 #else
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59 # define _GL_UNUSED_LABEL
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60 #endif
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61
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62 /* The __pure__ attribute was added in gcc 2.96. */
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63 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
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64 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
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65 #else
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66 # define _GL_ATTRIBUTE_PURE /* empty */
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67 #endif
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68
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69 /* The __const__ attribute was added in gcc 2.95. */
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70 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
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71 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
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72 #else
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73 # define _GL_ATTRIBUTE_CONST /* empty */
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74 #endif
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75
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76 /* The __malloc__ attribute was added in gcc 3. */
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77 #if 3 <= __GNUC__
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78 # define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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79 #else
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80 # define _GL_ATTRIBUTE_MALLOC /* empty */
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81 #endif
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82 ])
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83 dnl Preparation for running test programs:
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84 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
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85 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
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86 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
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87 LIBC_FATAL_STDERR_=1
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88 export LIBC_FATAL_STDERR_
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89 ])
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90
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91 # gl_MODULE_INDICATOR_CONDITION
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92 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
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93 # whether a gnulib module that has been requested shall be considered present
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94 # or not.
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95 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
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96
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97 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
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98 # sets the shell variable that indicates the presence of the given module to
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99 # a C preprocessor expression that will evaluate to 1.
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100 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
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101 [
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102 gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
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103 [GNULIB_[]m4_translit([[$1]],
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104 [abcdefghijklmnopqrstuvwxyz./-],
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105 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
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106 [gl_MODULE_INDICATOR_CONDITION])
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107 ])
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108
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109 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
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110 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
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111 # The shell variable's value is a C preprocessor expression that evaluates
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112 # to 0 or 1.
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113 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
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114 [
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115 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
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116 [
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117 dnl Simplify the expression VALUE || 1 to 1.
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118 $1=1
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119 ],
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120 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
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121 [gl_MODULE_INDICATOR_CONDITION])])
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122 ])
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123
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124 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
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125 # modifies the shell variable to include the given condition. The shell
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126 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
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127 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
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128 [
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129 dnl Simplify the expression 1 || CONDITION to 1.
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130 if test "$[]$1" != 1; then
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131 dnl Simplify the expression 0 || CONDITION to CONDITION.
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132 if test "$[]$1" = 0; then
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133 $1=$2
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134 else
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135 $1="($[]$1 || $2)"
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136 fi
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137 fi
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138 ])
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139
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140 # gl_MODULE_INDICATOR([modulename])
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141 # defines a C macro indicating the presence of the given module
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142 # in a location where it can be used.
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143 # | Value | Value |
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144 # | in lib/ | in tests/ |
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145 # --------------------------------------------+---------+-----------+
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146 # Module present among main modules: | 1 | 1 |
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147 # --------------------------------------------+---------+-----------+
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148 # Module present among tests-related modules: | 0 | 1 |
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149 # --------------------------------------------+---------+-----------+
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150 # Module not present at all: | 0 | 0 |
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151 # --------------------------------------------+---------+-----------+
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152 AC_DEFUN([gl_MODULE_INDICATOR],
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153 [
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154 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
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155 [abcdefghijklmnopqrstuvwxyz./-],
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156 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
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157 [gl_MODULE_INDICATOR_CONDITION],
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158 [Define to a C preprocessor expression that evaluates to 1 or 0,
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159 depending whether the gnulib module $1 shall be considered present.])
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160 ])
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161
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162 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
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163 # defines a C macro indicating the presence of the given module
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164 # in lib or tests. This is useful to determine whether the module
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165 # should be tested.
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166 # | Value | Value |
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167 # | in lib/ | in tests/ |
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168 # --------------------------------------------+---------+-----------+
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169 # Module present among main modules: | 1 | 1 |
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170 # --------------------------------------------+---------+-----------+
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171 # Module present among tests-related modules: | 1 | 1 |
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172 # --------------------------------------------+---------+-----------+
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173 # Module not present at all: | 0 | 0 |
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174 # --------------------------------------------+---------+-----------+
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175 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
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176 [
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177 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
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178 [abcdefghijklmnopqrstuvwxyz./-],
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179 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
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180 [Define to 1 when the gnulib module $1 should be tested.])
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181 ])
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182
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183 # gl_ASSERT_NO_GNULIB_POSIXCHECK
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184 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
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185 # and thereby enables an optimization of configure and config.h.
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186 # Used by Emacs.
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187 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
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188 [
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189 dnl Override gl_WARN_ON_USE_PREPARE.
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190 dnl But hide this definition from 'aclocal'.
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191 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
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192 ])
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193
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194 # gl_ASSERT_NO_GNULIB_TESTS
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195 # asserts that there will be no gnulib tests in the scope of the configure.ac
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196 # and thereby enables an optimization of config.h.
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197 # Used by Emacs.
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198 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
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199 [
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200 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
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201 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
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202 ])
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203
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204 # Test whether <features.h> exists.
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205 # Set HAVE_FEATURES_H.
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206 AC_DEFUN([gl_FEATURES_H],
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207 [
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208 AC_CHECK_HEADERS_ONCE([features.h])
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209 if test $ac_cv_header_features_h = yes; then
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210 HAVE_FEATURES_H=1
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211 else
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212 HAVE_FEATURES_H=0
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213 fi
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214 AC_SUBST([HAVE_FEATURES_H])
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215 ])
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216
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217 # m4_foreach_w
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218 # is a backport of autoconf-2.59c's m4_foreach_w.
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219 # Remove this macro when we can assume autoconf >= 2.60.
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220 m4_ifndef([m4_foreach_w],
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221 [m4_define([m4_foreach_w],
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222 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
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223
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224 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
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225 # ----------------------------------------------------
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226 # Backport of autoconf-2.63b's macro.
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227 # Remove this macro when we can assume autoconf >= 2.64.
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228 m4_ifndef([AS_VAR_IF],
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229 [m4_define([AS_VAR_IF],
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230 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
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231
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232 # gl_PROG_CC_C99
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233 # Modifies the value of the shell variable CC in an attempt to make $CC
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234 # understand ISO C99 source code.
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235 # This is like AC_PROG_CC_C99, except that
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236 # - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60,
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237 # - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
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238 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00367.html>,
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239 # but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
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240 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00441.html>.
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241 # Remaining problems:
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242 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
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243 # to CC twice
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244 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00431.html>.
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245 # - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
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246 AC_DEFUN([gl_PROG_CC_C99],
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247 [
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248 dnl Change that version number to the minimum Autoconf version that supports
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249 dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
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250 m4_version_prereq([9.0],
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251 [AC_REQUIRE([AC_PROG_CC_C99])],
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252 [AC_REQUIRE([AC_PROG_CC_STDC])])
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253 ])
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254
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255 # gl_PROG_AR_RANLIB
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256 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
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257 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
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258 # the values.
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259 AC_DEFUN([gl_PROG_AR_RANLIB],
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260 [
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261 dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
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262 dnl as "cc", and GCC as "gcc". They have different object file formats and
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263 dnl library formats. In particular, the GNU binutils programs ar and ranlib
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264 dnl produce libraries that work only with gcc, not with cc.
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265 AC_REQUIRE([AC_PROG_CC])
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266 dnl The '][' hides this use from 'aclocal'.
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267 AC_BEFORE([$0], [A][M_PROG_AR])
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268 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
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269 [
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270 AC_EGREP_CPP([Amsterdam],
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271 [
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272 #ifdef __ACK__
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273 Amsterdam
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274 #endif
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275 ],
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276 [gl_cv_c_amsterdam_compiler=yes],
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277 [gl_cv_c_amsterdam_compiler=no])
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278 ])
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279
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280 dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
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281 dnl building with __ACK__.
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282 if test $gl_cv_c_amsterdam_compiler = yes; then
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283 if test -z "$AR"; then
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284 AR='cc -c.a'
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285 fi
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286 if test -z "$ARFLAGS"; then
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287 ARFLAGS='-o'
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288 fi
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289 else
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290 dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST
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291 dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
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292 dnl script on-demand, if not specified by ./configure of course).
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293 dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
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294 dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block
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295 dnl because AM_PROG_AR is written so it could re-set AR variable even for
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296 dnl __ACK__. It may seem like its easier to avoid calling the macro here,
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297 dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
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298 dnl default value and automake should usually know them).
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299 dnl
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300 dnl The '][' hides this use from 'aclocal'.
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301 m4_ifdef([A][M_PROG_AR], [A][M_PROG_AR], [:])
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302 fi
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303
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304 dnl In case the code above has not helped with setting AR/ARFLAGS, use
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305 dnl Automake-documented default values for AR and ARFLAGS, but prefer
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306 dnl ${host}-ar over ar (useful for cross-compiling).
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307 AC_CHECK_TOOL([AR], [ar], [ar])
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308 if test -z "$ARFLAGS"; then
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309 ARFLAGS='cr'
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310 fi
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311
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312 AC_SUBST([AR])
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313 AC_SUBST([ARFLAGS])
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314 if test -z "$RANLIB"; then
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315 if test $gl_cv_c_amsterdam_compiler = yes; then
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316 RANLIB=':'
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317 else
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318 dnl Use the ranlib program if it is available.
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319 AC_PROG_RANLIB
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320 fi
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321 fi
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322 AC_SUBST([RANLIB])
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323 ])
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324
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325 # AC_PROG_MKDIR_P
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326 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
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327 # for interoperability with automake-1.9.6 from autoconf-2.62.
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328 # Remove this macro when we can assume autoconf >= 2.62 or
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329 # autoconf >= 2.60 && automake >= 1.10.
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330 # AC_AUTOCONF_VERSION was introduced in 2.62, so use that as the witness.
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331 m4_ifndef([AC_AUTOCONF_VERSION],[
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332 m4_ifdef([AC_PROG_MKDIR_P], [
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333 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
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334 m4_define([AC_PROG_MKDIR_P],
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335 m4_defn([AC_PROG_MKDIR_P])[
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336 AC_SUBST([MKDIR_P])])], [
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337 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
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338 AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
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339 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
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340 MKDIR_P='$(mkdir_p)'
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341 AC_SUBST([MKDIR_P])])])
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342 ])
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343
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344 # AC_C_RESTRICT
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345 # This definition is copied from post-2.69 Autoconf and overrides the
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346 # AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed
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347 # once autoconf >= 2.70 can be assumed. It's painful to check version
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348 # numbers, and in practice this macro is more up-to-date than Autoconf
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349 # is, so override Autoconf unconditionally.
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350 AC_DEFUN([AC_C_RESTRICT],
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351 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
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352 [ac_cv_c_restrict=no
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353 # The order here caters to the fact that C++ does not require restrict.
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354 for ac_kw in __restrict __restrict__ _Restrict restrict; do
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355 AC_COMPILE_IFELSE(
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356 [AC_LANG_PROGRAM(
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357 [[typedef int *int_ptr;
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358 int foo (int_ptr $ac_kw ip) { return ip[0]; }
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359 int bar (int [$ac_kw]); /* Catch GCC bug 14050. */
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360 int bar (int ip[$ac_kw]) { return ip[0]; }
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diff changeset
361 ]],
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diff changeset
362 [[int s[1];
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363 int *$ac_kw t = s;
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364 t[0] = 0;
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365 return foo (t) + bar (t);
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diff changeset
366 ]])],
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367 [ac_cv_c_restrict=$ac_kw])
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368 test "$ac_cv_c_restrict" != no && break
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diff changeset
369 done
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370 ])
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371 AH_VERBATIM([restrict],
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372 [/* Define to the equivalent of the C99 'restrict' keyword, or to
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373 nothing if this is not supported. Do not define if restrict is
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374 supported directly. */
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375 #undef restrict
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376 /* Work around a bug in Sun C++: it does not support _Restrict or
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377 __restrict__, even though the corresponding Sun C compiler ends up with
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378 "#define restrict _Restrict" or "#define restrict __restrict__" in the
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379 previous line. Perhaps some future version of Sun C++ will work with
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380 restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
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381 #if defined __SUNPRO_CC && !defined __RESTRICT
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382 # define _Restrict
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383 # define __restrict__
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diff changeset
384 #endif])
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385 case $ac_cv_c_restrict in
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386 restrict) ;;
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387 no) AC_DEFINE([restrict], []) ;;
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388 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
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389 esac
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390 ])# AC_C_RESTRICT
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391
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392 # gl_BIGENDIAN
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393 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
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394 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
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395 # macros invoke AC_C_BIGENDIAN with arguments.
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396 AC_DEFUN([gl_BIGENDIAN],
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diff changeset
397 [
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diff changeset
398 AC_C_BIGENDIAN
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diff changeset
399 ])
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400
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diff changeset
401 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
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402 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
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diff changeset
403 # output a spurious "(cached)" mark in the midst of other configure output.
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diff changeset
404 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
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405 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
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406 AC_DEFUN([gl_CACHE_VAL_SILENT],
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diff changeset
407 [
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408 saved_as_echo_n="$as_echo_n"
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409 as_echo_n=':'
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410 AC_CACHE_VAL([$1], [$2])
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411 as_echo_n="$saved_as_echo_n"
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diff changeset
412 ])
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413
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414 # AS_VAR_COPY was added in autoconf 2.63b
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415 m4_define_default([AS_VAR_COPY],
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416 [AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])
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417
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418 # AC_PROG_SED was added in autoconf 2.59b
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419 m4_ifndef([AC_PROG_SED],
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420 [AC_DEFUN([AC_PROG_SED],
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421 [AC_CACHE_CHECK([for a sed that does not truncate output], ac_cv_path_SED,
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422 [dnl ac_script should not contain more than 99 commands (for HP-UX sed),
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423 dnl but more than about 7000 bytes, to catch a limit in Solaris 8 /usr/ucb/sed.
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424 ac_script=s/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa/bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb/
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425 for ac_i in 1 2 3 4 5 6 7; do
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426 ac_script="$ac_script$as_nl$ac_script"
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427 done
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428 echo "$ac_script" 2>/dev/null | sed 99q >conftest.sed
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429 AS_UNSET([ac_script])
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430 if test -z "$SED"; then
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431 ac_path_SED_found=false
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432 _AS_PATH_WALK([], [
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433 for ac_prog in sed gsed; do
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434 for ac_exec_ext in '' $ac_executable_extensions; do
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435 ac_path_SED="$as_dir/$ac_prog$ac_exec_ext"
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436 AS_EXECUTABLE_P(["$ac_path_SED"]) || continue
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437 case `"$ac_path_SED" --version 2>&1` in
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438 *GNU*) ac_cv_path_SED=$ac_path_SED ac_path_SED_found=:;;
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diff changeset
439 *)
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440 ac_count=0
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441 _AS_ECHO_N([0123456789]) >conftest.in
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442 while :
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443 do
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444 cat conftest.in conftest.in >conftest.tmp
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445 mv conftest.tmp conftest.in
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446 cp conftest.in conftest.nl
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447 echo >> conftest.nl
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448 "$ac_path_SED" -f conftest.sed <conftest.nl >conftest.out 2>/dev/null || break
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449 diff conftest.out conftest.nl >/dev/null 2>&1 || break
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450 ac_count=`expr $ac_count + 1`
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451 if test $ac_count -gt ${ac_path_SED_max-0}; then
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452 # Best so far, but keep looking for better
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453 ac_cv_path_SED=$ac_path_SED
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454 ac_path_SED_max=$ac_count
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455 fi
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456 test $ac_count -gt 10 && break
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457 done
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458 rm -f conftest.in conftest.tmp conftest.nl conftest.out;;
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diff changeset
459 esac
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diff changeset
460 $ac_path_SED_found && break 3
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diff changeset
461 done
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diff changeset
462 done])
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463 if test -z "$ac_cv_path_SED"; then
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464 AC_ERROR([no acceptable sed could be found in \$PATH])
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diff changeset
465 fi
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diff changeset
466 else
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diff changeset
467 ac_cv_path_SED=$SED
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468 fi
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469 ])
17615
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470 SED="$ac_cv_path_SED"
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471 AC_SUBST([SED])dnl
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472 rm -f conftest.sed
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473 ])
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474 ])