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_Noreturn: GCC 4.7 does not support [[noreturn]] in C++11 mode * lib/_Noreturn.h, m4/gnulib-common.m4: Don't use [[noreturn]] before GCC 4.8.
author Akim Demaille <akim.demaille@gmail.com>
date Sun, 17 Mar 2019 19:27:20 +0100
parents b06060465f09
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
40246
c34f677e6117 _Noreturn: GCC 4.7 does not support [[noreturn]] in C++11 mode
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1 # gnulib-common.m4 serial 42
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2 dnl Copyright (C) 2007-2019 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
e3424061171f Back from an automatic module-indicator macro to a module-indicator macro
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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 AC_PREREQ([2.62])
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8
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9 # gl_COMMON
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10 # is expanded unconditionally through gnulib-tool magic.
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11 AC_DEFUN([gl_COMMON], [
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12 dnl Use AC_REQUIRE here, so that the code is expanded once only.
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13 AC_REQUIRE([gl_00GNULIB])
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14 AC_REQUIRE([gl_COMMON_BODY])
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15 ])
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16 AC_DEFUN([gl_COMMON_BODY], [
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17 AH_VERBATIM([_Noreturn],
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18 [/* The _Noreturn keyword of C11. */
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19 #ifndef _Noreturn
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20 # if (201103 <= (defined __cplusplus ? __cplusplus : 0) \
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21 && (!defined __GNUC__ || 4 < __GNUC__ + (8 <= __GNUC_MINOR__)))
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22 # define _Noreturn [[noreturn]]
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23 # elif (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
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24 || 4 < __GNUC__ + (7 <= __GNUC_MINOR__))
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25 /* _Noreturn works as-is. */
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26 # elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
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27 # define _Noreturn __attribute__ ((__noreturn__))
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28 # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
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29 # define _Noreturn __declspec (noreturn)
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30 # else
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31 # define _Noreturn
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32 # endif
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33 #endif
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34 ])
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35 AH_VERBATIM([isoc99_inline],
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36 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
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37 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
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38 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
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39 __APPLE__ && __MACH__ test for Mac OS X.
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40 __APPLE_CC__ tests for the Apple compiler and its version.
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41 __STDC_VERSION__ tests for the C99 mode. */
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42 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
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43 # define __GNUC_STDC_INLINE__ 1
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44 #endif])
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45 AH_VERBATIM([unused_parameter],
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46 [/* Define as a marker that can be attached to declarations that might not
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47 be used. This helps to reduce warnings, such as from
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48 GCC -Wunused-parameter. */
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49 #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
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50 # define _GL_UNUSED __attribute__ ((__unused__))
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51 #else
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52 # define _GL_UNUSED
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53 #endif
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54 /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
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55 is a misnomer outside of parameter lists. */
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56 #define _UNUSED_PARAMETER_ _GL_UNUSED
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57
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58 /* gcc supports the "unused" attribute on possibly unused labels, and
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59 g++ has since version 4.5. Note to support C++ as well as C,
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60 _GL_UNUSED_LABEL should be used with a trailing ; */
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61 #if !defined __cplusplus || __GNUC__ > 4 \
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62 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
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63 # define _GL_UNUSED_LABEL _GL_UNUSED
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64 #else
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65 # define _GL_UNUSED_LABEL
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66 #endif
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67
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68 /* The __pure__ attribute was added in gcc 2.96. */
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69 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
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70 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
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71 #else
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72 # define _GL_ATTRIBUTE_PURE /* empty */
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73 #endif
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74
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75 /* The __const__ attribute was added in gcc 2.95. */
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76 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
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77 # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
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78 #else
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79 # define _GL_ATTRIBUTE_CONST /* empty */
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80 #endif
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81
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82 /* The __malloc__ attribute was added in gcc 3. */
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83 #if 3 <= __GNUC__
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84 # define _GL_ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
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85 #else
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86 # define _GL_ATTRIBUTE_MALLOC /* empty */
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87 #endif
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88 ])
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89 dnl Preparation for running test programs:
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90 dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not
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91 dnl to /dev/tty, so they can be redirected to log files. Such diagnostics
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92 dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N.
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93 LIBC_FATAL_STDERR_=1
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94 export LIBC_FATAL_STDERR_
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95 ])
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96
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97 # gl_MODULE_INDICATOR_CONDITION
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98 # expands to a C preprocessor expression that evaluates to 1 or 0, depending
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99 # whether a gnulib module that has been requested shall be considered present
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100 # or not.
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101 m4_define([gl_MODULE_INDICATOR_CONDITION], [1])
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102
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103 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
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104 # sets the shell variable that indicates the presence of the given module to
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105 # a C preprocessor expression that will evaluate to 1.
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106 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
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107 [
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108 gl_MODULE_INDICATOR_SET_VARIABLE_AUX(
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109 [GNULIB_[]m4_translit([[$1]],
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110 [abcdefghijklmnopqrstuvwxyz./-],
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111 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])],
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112 [gl_MODULE_INDICATOR_CONDITION])
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113 ])
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114
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115 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable])
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116 # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION.
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117 # The shell variable's value is a C preprocessor expression that evaluates
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118 # to 0 or 1.
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119 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX],
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120 [
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121 m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1],
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122 [
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123 dnl Simplify the expression VALUE || 1 to 1.
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124 $1=1
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125 ],
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126 [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1],
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127 [gl_MODULE_INDICATOR_CONDITION])])
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128 ])
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129
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130 # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition])
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131 # modifies the shell variable to include the given condition. The shell
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132 # variable's value is a C preprocessor expression that evaluates to 0 or 1.
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133 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR],
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134 [
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135 dnl Simplify the expression 1 || CONDITION to 1.
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136 if test "$[]$1" != 1; then
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137 dnl Simplify the expression 0 || CONDITION to CONDITION.
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138 if test "$[]$1" = 0; then
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139 $1=$2
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140 else
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141 $1="($[]$1 || $2)"
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142 fi
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143 fi
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144 ])
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145
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146 # gl_MODULE_INDICATOR([modulename])
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147 # defines a C macro indicating the presence of the given module
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148 # in a location where it can be used.
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149 # | Value | Value |
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150 # | in lib/ | in tests/ |
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151 # --------------------------------------------+---------+-----------+
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152 # Module present among main modules: | 1 | 1 |
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153 # --------------------------------------------+---------+-----------+
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154 # Module present among tests-related modules: | 0 | 1 |
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155 # --------------------------------------------+---------+-----------+
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156 # Module not present at all: | 0 | 0 |
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157 # --------------------------------------------+---------+-----------+
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158 AC_DEFUN([gl_MODULE_INDICATOR],
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159 [
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160 AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]],
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161 [abcdefghijklmnopqrstuvwxyz./-],
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162 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]),
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163 [gl_MODULE_INDICATOR_CONDITION],
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164 [Define to a C preprocessor expression that evaluates to 1 or 0,
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165 depending whether the gnulib module $1 shall be considered present.])
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166 ])
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167
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168 # gl_MODULE_INDICATOR_FOR_TESTS([modulename])
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169 # defines a C macro indicating the presence of the given module
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170 # in lib or tests. This is useful to determine whether the module
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171 # should be tested.
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172 # | Value | Value |
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173 # | in lib/ | in tests/ |
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174 # --------------------------------------------+---------+-----------+
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175 # Module present among main modules: | 1 | 1 |
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176 # --------------------------------------------+---------+-----------+
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177 # Module present among tests-related modules: | 1 | 1 |
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178 # --------------------------------------------+---------+-----------+
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179 # Module not present at all: | 0 | 0 |
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180 # --------------------------------------------+---------+-----------+
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181 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS],
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182 [
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183 AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]],
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184 [abcdefghijklmnopqrstuvwxyz./-],
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185 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
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186 [Define to 1 when the gnulib module $1 should be tested.])
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187 ])
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188
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189 # gl_ASSERT_NO_GNULIB_POSIXCHECK
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190 # asserts that there will never be a need to #define GNULIB_POSIXCHECK.
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191 # and thereby enables an optimization of configure and config.h.
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192 # Used by Emacs.
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193 AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK],
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194 [
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195 dnl Override gl_WARN_ON_USE_PREPARE.
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196 dnl But hide this definition from 'aclocal'.
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197 AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], [])
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198 ])
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199
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200 # gl_ASSERT_NO_GNULIB_TESTS
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201 # asserts that there will be no gnulib tests in the scope of the configure.ac
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202 # and thereby enables an optimization of config.h.
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203 # Used by Emacs.
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204 AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS],
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205 [
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206 dnl Override gl_MODULE_INDICATOR_FOR_TESTS.
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207 AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], [])
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208 ])
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209
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210 # Test whether <features.h> exists.
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211 # Set HAVE_FEATURES_H.
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212 AC_DEFUN([gl_FEATURES_H],
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213 [
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214 AC_CHECK_HEADERS_ONCE([features.h])
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215 if test $ac_cv_header_features_h = yes; then
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216 HAVE_FEATURES_H=1
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217 else
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218 HAVE_FEATURES_H=0
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219 fi
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220 AC_SUBST([HAVE_FEATURES_H])
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221 ])
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222
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223 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
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224 # ----------------------------------------------------
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225 # Backport of autoconf-2.63b's macro.
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226 # Remove this macro when we can assume autoconf >= 2.64.
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227 m4_ifndef([AS_VAR_IF],
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228 [m4_define([AS_VAR_IF],
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229 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
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230
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231 # gl_PROG_CC_C99
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232 # Modifies the value of the shell variable CC in an attempt to make $CC
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233 # understand ISO C99 source code.
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234 # This is like AC_PROG_CC_C99, except that
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235 # - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC
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236 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00367.html>,
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237 # but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99
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238 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00441.html>.
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239 # Remaining problems:
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240 # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options
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241 # to CC twice
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242 # <https://lists.gnu.org/r/bug-gnulib/2011-09/msg00431.html>.
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243 # - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard.
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244 AC_DEFUN([gl_PROG_CC_C99],
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245 [
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246 dnl Change that version number to the minimum Autoconf version that supports
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247 dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls.
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248 m4_version_prereq([9.0],
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249 [AC_REQUIRE([AC_PROG_CC_C99])],
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250 [AC_REQUIRE([AC_PROG_CC_STDC])])
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251 ])
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252
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253 # gl_PROG_AR_RANLIB
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254 # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler.
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255 # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override
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256 # the values.
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257 AC_DEFUN([gl_PROG_AR_RANLIB],
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258 [
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259 dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler
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260 dnl as "cc", and GCC as "gcc". They have different object file formats and
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261 dnl library formats. In particular, the GNU binutils programs ar and ranlib
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262 dnl produce libraries that work only with gcc, not with cc.
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263 AC_REQUIRE([AC_PROG_CC])
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264 dnl The '][' hides this use from 'aclocal'.
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265 AC_BEFORE([$0], [A][M_PROG_AR])
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266 AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler],
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267 [
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268 AC_EGREP_CPP([Amsterdam],
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269 [
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270 #ifdef __ACK__
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271 Amsterdam
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272 #endif
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273 ],
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274 [gl_cv_c_amsterdam_compiler=yes],
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275 [gl_cv_c_amsterdam_compiler=no])
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276 ])
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277
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278 dnl Don't compete with AM_PROG_AR's decision about AR/ARFLAGS if we are not
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279 dnl building with __ACK__.
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280 if test $gl_cv_c_amsterdam_compiler = yes; then
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281 if test -z "$AR"; then
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282 AR='cc -c.a'
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283 fi
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284 if test -z "$ARFLAGS"; then
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285 ARFLAGS='-o'
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286 fi
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287 else
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288 dnl AM_PROG_AR was added in automake v1.11.2. AM_PROG_AR does not AC_SUBST
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289 dnl ARFLAGS variable (it is filed into Makefile.in directly by automake
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290 dnl script on-demand, if not specified by ./configure of course).
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291 dnl Don't AC_REQUIRE the AM_PROG_AR otherwise the code for __ACK__ above
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292 dnl will be ignored. Also, pay attention to call AM_PROG_AR in else block
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293 dnl because AM_PROG_AR is written so it could re-set AR variable even for
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294 dnl __ACK__. It may seem like its easier to avoid calling the macro here,
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295 dnl but we need to AC_SUBST both AR/ARFLAGS (thus those must have some good
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296 dnl default value and automake should usually know them).
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297 dnl
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298 dnl The '][' hides this use from 'aclocal'.
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299 m4_ifdef([A][M_PROG_AR], [A][M_PROG_AR], [:])
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300 fi
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301
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302 dnl In case the code above has not helped with setting AR/ARFLAGS, use
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303 dnl Automake-documented default values for AR and ARFLAGS, but prefer
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304 dnl ${host}-ar over ar (useful for cross-compiling).
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305 AC_CHECK_TOOL([AR], [ar], [ar])
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306 if test -z "$ARFLAGS"; then
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307 ARFLAGS='cr'
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308 fi
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309
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310 AC_SUBST([AR])
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311 AC_SUBST([ARFLAGS])
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312 if test -z "$RANLIB"; then
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313 if test $gl_cv_c_amsterdam_compiler = yes; then
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314 RANLIB=':'
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315 else
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316 dnl Use the ranlib program if it is available.
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317 AC_PROG_RANLIB
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318 fi
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319 fi
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320 AC_SUBST([RANLIB])
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321 ])
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322
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323 # AC_C_RESTRICT
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324 # This definition is copied from post-2.69 Autoconf and overrides the
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325 # AC_C_RESTRICT macro from autoconf 2.60..2.69. It can be removed
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326 # once autoconf >= 2.70 can be assumed. It's painful to check version
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327 # numbers, and in practice this macro is more up-to-date than Autoconf
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328 # is, so override Autoconf unconditionally.
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329 AC_DEFUN([AC_C_RESTRICT],
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330 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
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331 [ac_cv_c_restrict=no
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332 # The order here caters to the fact that C++ does not require restrict.
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333 for ac_kw in __restrict __restrict__ _Restrict restrict; do
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334 AC_COMPILE_IFELSE(
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335 [AC_LANG_PROGRAM(
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336 [[typedef int *int_ptr;
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337 int foo (int_ptr $ac_kw ip) { return ip[0]; }
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338 int bar (int [$ac_kw]); /* Catch GCC bug 14050. */
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339 int bar (int ip[$ac_kw]) { return ip[0]; }
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340 ]],
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341 [[int s[1];
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342 int *$ac_kw t = s;
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343 t[0] = 0;
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344 return foo (t) + bar (t);
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345 ]])],
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346 [ac_cv_c_restrict=$ac_kw])
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347 test "$ac_cv_c_restrict" != no && break
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348 done
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349 ])
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350 AH_VERBATIM([restrict],
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351 [/* Define to the equivalent of the C99 'restrict' keyword, or to
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352 nothing if this is not supported. Do not define if restrict is
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353 supported directly. */
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354 #undef restrict
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355 /* Work around a bug in Sun C++: it does not support _Restrict or
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356 __restrict__, even though the corresponding Sun C compiler ends up with
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357 "#define restrict _Restrict" or "#define restrict __restrict__" in the
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358 previous line. Perhaps some future version of Sun C++ will work with
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359 restrict; if so, hopefully it defines __RESTRICT like Sun C does. */
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360 #if defined __SUNPRO_CC && !defined __RESTRICT
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361 # define _Restrict
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362 # define __restrict__
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363 #endif])
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364 case $ac_cv_c_restrict in
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365 restrict) ;;
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366 no) AC_DEFINE([restrict], []) ;;
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367 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
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368 esac
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369 ])# AC_C_RESTRICT
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370
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371 # gl_BIGENDIAN
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372 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
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373 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
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374 # macros invoke AC_C_BIGENDIAN with arguments.
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375 AC_DEFUN([gl_BIGENDIAN],
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376 [
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377 AC_C_BIGENDIAN
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378 ])
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379
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380 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
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381 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
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382 # output a spurious "(cached)" mark in the midst of other configure output.
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383 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
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384 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
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385 AC_DEFUN([gl_CACHE_VAL_SILENT],
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386 [
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387 saved_as_echo_n="$as_echo_n"
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388 as_echo_n=':'
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389 AC_CACHE_VAL([$1], [$2])
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390 as_echo_n="$saved_as_echo_n"
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391 ])
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392
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393 # AS_VAR_COPY was added in autoconf 2.63b
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394 m4_define_default([AS_VAR_COPY],
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395 [AS_LITERAL_IF([$1[]$2], [$1=$$2], [eval $1=\$$2])])