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Factorize common .m4 code.
author Bruno Haible <bruno@clisp.org>
date Sat, 27 Mar 2010 18:38:53 +0100
parents 0ca4a77ffffb
children 0e829091f9c0
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13066
fc8c984b0733 Factorize common .m4 code.
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1 # gnulib-common.m4 serial 14
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2 dnl Copyright (C) 2007-2010 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([isoc99_inline],
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16 [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports
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17 the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of
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18 earlier versions), but does not display it by setting __GNUC_STDC_INLINE__.
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19 __APPLE__ && __MACH__ test for MacOS X.
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20 __APPLE_CC__ tests for the Apple compiler and its version.
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21 __STDC_VERSION__ tests for the C99 mode. */
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22 #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__
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23 # define __GNUC_STDC_INLINE__ 1
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24 #endif])
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25 AH_VERBATIM([unused_parameter],
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26 [/* Define as a marker that can be attached to declarations that might not
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27 be used. This helps to reduce warnings, such as from
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28 GCC -Wunused-parameter. */
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29 #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
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30 # define _GL_UNUSED __attribute__ ((__unused__))
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31 #else
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32 # define _GL_UNUSED
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33 #endif
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34 /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name
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35 is a misnomer outside of parameter lists. */
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36 #define _UNUSED_PARAMETER_ _GL_UNUSED
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37 ])
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38 ])
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39
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40 # gl_MODULE_INDICATOR_SET_VARIABLE([modulename])
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41 # sets the shell variable that indicates the presence of the given module to
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42 # a C preprocessor expression that will evaluate to 1.
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43 AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE],
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44 [
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45 GNULIB_[]m4_translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=1
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46 ])
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47
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48 # gl_MODULE_INDICATOR([modulename])
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49 # defines a C macro indicating the presence of the given module.
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50 AC_DEFUN([gl_MODULE_INDICATOR],
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51 [
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52 AC_DEFINE([GNULIB_]translit([$1],[abcdefghijklmnopqrstuvwxyz./-],[ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1],
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53 [Define to 1 when using the gnulib module ]$1[.])
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54 ])
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55
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56 # m4_foreach_w
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57 # is a backport of autoconf-2.59c's m4_foreach_w.
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58 # Remove this macro when we can assume autoconf >= 2.60.
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59 m4_ifndef([m4_foreach_w],
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60 [m4_define([m4_foreach_w],
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61 [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])])
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62
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63 # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH])
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64 # ----------------------------------------------------
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65 # Backport of autoconf-2.63b's macro.
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66 # Remove this macro when we can assume autoconf >= 2.64.
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67 m4_ifndef([AS_VAR_IF],
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68 [m4_define([AS_VAR_IF],
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69 [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])])
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70
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71 # AC_PROG_MKDIR_P
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72 # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix
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73 # for interoperability with automake-1.9.6 from autoconf-2.62.
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74 # Remove this macro when we can assume autoconf >= 2.62 or
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75 # autoconf >= 2.60 && automake >= 1.10.
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76 m4_ifdef([AC_PROG_MKDIR_P], [
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77 dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed.
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78 m4_define([AC_PROG_MKDIR_P],
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79 m4_defn([AC_PROG_MKDIR_P])[
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80 AC_SUBST([MKDIR_P])])], [
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81 dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P.
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82 AC_DEFUN_ONCE([AC_PROG_MKDIR_P],
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83 [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake
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84 MKDIR_P='$(mkdir_p)'
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85 AC_SUBST([MKDIR_P])])])
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86
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87 # AC_C_RESTRICT
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88 # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61,
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89 # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++
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90 # works.
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91 # This definition can be removed once autoconf >= 2.62 can be assumed.
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92 AC_DEFUN([AC_C_RESTRICT],
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93 [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict],
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94 [ac_cv_c_restrict=no
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95 # The order here caters to the fact that C++ does not require restrict.
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96 for ac_kw in __restrict __restrict__ _Restrict restrict; do
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97 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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98 [[typedef int * int_ptr;
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99 int foo (int_ptr $ac_kw ip) {
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100 return ip[0];
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101 }]],
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102 [[int s[1];
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103 int * $ac_kw t = s;
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104 t[0] = 0;
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105 return foo(t)]])],
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106 [ac_cv_c_restrict=$ac_kw])
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107 test "$ac_cv_c_restrict" != no && break
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108 done
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109 ])
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110 AH_VERBATIM([restrict],
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111 [/* Define to the equivalent of the C99 'restrict' keyword, or to
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112 nothing if this is not supported. Do not define if restrict is
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113 supported directly. */
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114 #undef restrict
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115 /* Work around a bug in Sun C++: it does not support _Restrict, even
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116 though the corresponding Sun C compiler does, which causes
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117 "#define restrict _Restrict" in the previous line. Perhaps some future
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118 version of Sun C++ will work with _Restrict; if so, it'll probably
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119 define __RESTRICT, just as Sun C does. */
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120 #if defined __SUNPRO_CC && !defined __RESTRICT
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121 # define _Restrict
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122 #endif])
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123 case $ac_cv_c_restrict in
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124 restrict) ;;
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125 no) AC_DEFINE([restrict], []) ;;
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126 *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;;
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127 esac
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128 ])
11053
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129
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130 # gl_BIGENDIAN
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131 # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd.
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132 # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some
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133 # macros invoke AC_C_BIGENDIAN with arguments.
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134 AC_DEFUN([gl_BIGENDIAN],
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135 [
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136 AC_C_BIGENDIAN
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137 ])
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138
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139 # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it)
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140 # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not
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141 # output a spurious "(cached)" mark in the midst of other configure output.
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142 # This macro should be used instead of AC_CACHE_VAL when it is not surrounded
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143 # by an AC_MSG_CHECKING/AC_MSG_RESULT pair.
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144 AC_DEFUN([gl_CACHE_VAL_SILENT],
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145 [
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146 saved_as_echo_n="$as_echo_n"
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147 as_echo_n=':'
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148 AC_CACHE_VAL([$1], [$2])
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149 as_echo_n="$saved_as_echo_n"
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150 ])