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1 | # gnulib-common.m4 serial 23 |
2 | dnl Copyright (C) 2007-2011 Free Software Foundation, Inc. | |
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3 | dnl This file is free software; the Free Software Foundation |
4 | dnl gives unlimited permission to copy and/or distribute it, | |
5 | dnl with or without modifications, as long as this notice is preserved. | |
6 | ||
7 | # gl_COMMON | |
8 | # is expanded unconditionally through gnulib-tool magic. | |
9 | AC_DEFUN([gl_COMMON], [ | |
10 | dnl Use AC_REQUIRE here, so that the code is expanded once only. | |
f240aacb | 11 | AC_REQUIRE([gl_00GNULIB]) |
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12 | AC_REQUIRE([gl_COMMON_BODY]) |
13 | ]) | |
14 | AC_DEFUN([gl_COMMON_BODY], [ | |
15 | AH_VERBATIM([isoc99_inline], | |
16 | [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports | |
17 | the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of | |
18 | earlier versions), but does not display it by setting __GNUC_STDC_INLINE__. | |
19 | __APPLE__ && __MACH__ test for MacOS X. | |
20 | __APPLE_CC__ tests for the Apple compiler and its version. | |
21 | __STDC_VERSION__ tests for the C99 mode. */ | |
22 | #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__ | |
23 | # define __GNUC_STDC_INLINE__ 1 | |
24 | #endif]) | |
aa7a939c | 25 | AH_VERBATIM([unused_parameter], |
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26 | [/* Define as a marker that can be attached to declarations that might not |
27 | be used. This helps to reduce warnings, such as from | |
28 | GCC -Wunused-parameter. */ | |
aa7a939c | 29 | #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7) |
61cd9dc9 | 30 | # define _GL_UNUSED __attribute__ ((__unused__)) |
aa7a939c | 31 | #else |
61cd9dc9 | 32 | # define _GL_UNUSED |
aa7a939c | 33 | #endif |
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34 | /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name |
35 | is a misnomer outside of parameter lists. */ | |
36 | #define _UNUSED_PARAMETER_ _GL_UNUSED | |
aa7a939c | 37 | ]) |
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38 | dnl Preparation for running test programs: |
39 | dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not | |
40 | dnl to /dev/tty, so they can be redirected to log files. Such diagnostics | |
41 | dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N. | |
42 | LIBC_FATAL_STDERR_=1 | |
43 | export LIBC_FATAL_STDERR_ | |
44 | ]) | |
45 | ||
46 | # gl_MODULE_INDICATOR_CONDITION | |
47 | # expands to a C preprocessor expression that evaluates to 1 or 0, depending | |
48 | # whether a gnulib module that has been requested shall be considered present | |
49 | # or not. | |
50 | AC_DEFUN([gl_MODULE_INDICATOR_CONDITION], [1]) | |
51 | ||
52 | # gl_MODULE_INDICATOR_SET_VARIABLE([modulename]) | |
53 | # sets the shell variable that indicates the presence of the given module to | |
54 | # a C preprocessor expression that will evaluate to 1. | |
55 | AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE], | |
56 | [ | |
57 | GNULIB_[]m4_translit([[$1]], | |
58 | [abcdefghijklmnopqrstuvwxyz./-], | |
59 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])=gl_MODULE_INDICATOR_CONDITION | |
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60 | ]) |
61 | ||
62 | # gl_MODULE_INDICATOR([modulename]) | |
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63 | # defines a C macro indicating the presence of the given module |
64 | # in a location where it can be used. | |
65 | # | Value | Value | | |
66 | # | in lib/ | in tests/ | | |
67 | # --------------------------------------------+---------+-----------+ | |
68 | # Module present among main modules: | 1 | 1 | | |
69 | # --------------------------------------------+---------+-----------+ | |
70 | # Module present among tests-related modules: | 0 | 1 | | |
71 | # --------------------------------------------+---------+-----------+ | |
72 | # Module not present at all: | 0 | 0 | | |
73 | # --------------------------------------------+---------+-----------+ | |
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74 | AC_DEFUN([gl_MODULE_INDICATOR], |
75 | [ | |
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76 | AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]], |
77 | [abcdefghijklmnopqrstuvwxyz./-], | |
78 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), | |
79 | [gl_MODULE_INDICATOR_CONDITION], | |
80 | [Define to a C preprocessor expression that evaluates to 1 or 0, | |
81 | depending whether the gnulib module $1 shall be considered present.]) | |
82 | ]) | |
83 | ||
84 | # gl_MODULE_INDICATOR_FOR_TESTS([modulename]) | |
85 | # defines a C macro indicating the presence of the given module | |
86 | # in lib or tests. This is useful to determine whether the module | |
87 | # should be tested. | |
88 | # | Value | Value | | |
89 | # | in lib/ | in tests/ | | |
90 | # --------------------------------------------+---------+-----------+ | |
91 | # Module present among main modules: | 1 | 1 | | |
92 | # --------------------------------------------+---------+-----------+ | |
93 | # Module present among tests-related modules: | 1 | 1 | | |
94 | # --------------------------------------------+---------+-----------+ | |
95 | # Module not present at all: | 0 | 0 | | |
96 | # --------------------------------------------+---------+-----------+ | |
97 | AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], | |
98 | [ | |
99 | AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]], | |
100 | [abcdefghijklmnopqrstuvwxyz./-], | |
101 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1], | |
102 | [Define to 1 when the gnulib module $1 should be tested.]) | |
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103 | ]) |
104 | ||
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105 | # gl_ASSERT_NO_GNULIB_POSIXCHECK |
106 | # asserts that there will never be a need to #define GNULIB_POSIXCHECK. | |
107 | # and thereby enables an optimization of configure and config.h. | |
108 | # Used by Emacs. | |
109 | AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK], | |
110 | [ | |
111 | dnl Override gl_WARN_ON_USE_PREPARE. | |
112 | AC_DEFUN([gl_WARN_ON_USE_PREPARE], []) | |
113 | ]) | |
114 | ||
115 | # gl_ASSERT_NO_GNULIB_TESTS | |
116 | # asserts that there will be no gnulib tests in the scope of the configure.ac | |
117 | # and thereby enables an optimization of config.h. | |
118 | # Used by Emacs. | |
119 | AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS], | |
120 | [ | |
121 | dnl Override gl_MODULE_INDICATOR_FOR_TESTS. | |
122 | AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], []) | |
123 | ]) | |
124 | ||
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125 | # Test whether <features.h> exists. |
126 | # Set HAVE_FEATURES_H. | |
127 | AC_DEFUN([gl_FEATURES_H], | |
128 | [ | |
129 | AC_CHECK_HEADERS_ONCE([features.h]) | |
130 | if test $ac_cv_header_features_h = yes; then | |
131 | HAVE_FEATURES_H=1 | |
132 | else | |
133 | HAVE_FEATURES_H=0 | |
134 | fi | |
135 | AC_SUBST([HAVE_FEATURES_H]) | |
136 | ]) | |
137 | ||
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138 | # m4_foreach_w |
139 | # is a backport of autoconf-2.59c's m4_foreach_w. | |
140 | # Remove this macro when we can assume autoconf >= 2.60. | |
141 | m4_ifndef([m4_foreach_w], | |
142 | [m4_define([m4_foreach_w], | |
143 | [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])]) | |
144 | ||
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145 | # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH]) |
146 | # ---------------------------------------------------- | |
147 | # Backport of autoconf-2.63b's macro. | |
148 | # Remove this macro when we can assume autoconf >= 2.64. | |
149 | m4_ifndef([AS_VAR_IF], | |
150 | [m4_define([AS_VAR_IF], | |
151 | [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])]) | |
152 | ||
103dc4d4 | 153 | # AC_PROG_MKDIR_P |
f4c79b3c LC |
154 | # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix |
155 | # for interoperability with automake-1.9.6 from autoconf-2.62. | |
156 | # Remove this macro when we can assume autoconf >= 2.62 or | |
157 | # autoconf >= 2.60 && automake >= 1.10. | |
158 | m4_ifdef([AC_PROG_MKDIR_P], [ | |
159 | dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed. | |
160 | m4_define([AC_PROG_MKDIR_P], | |
161 | m4_defn([AC_PROG_MKDIR_P])[ | |
162 | AC_SUBST([MKDIR_P])])], [ | |
163 | dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P. | |
f240aacb | 164 | AC_DEFUN_ONCE([AC_PROG_MKDIR_P], |
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165 | [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake |
166 | MKDIR_P='$(mkdir_p)' | |
167 | AC_SUBST([MKDIR_P])])]) | |
168 | ||
169 | # AC_C_RESTRICT | |
170 | # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61, | |
171 | # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++ | |
172 | # works. | |
173 | # This definition can be removed once autoconf >= 2.62 can be assumed. | |
a927b6c1 | 174 | m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[ |
103dc4d4 | 175 | AC_DEFUN([AC_C_RESTRICT], |
f240aacb | 176 | [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict], |
103dc4d4 LC |
177 | [ac_cv_c_restrict=no |
178 | # The order here caters to the fact that C++ does not require restrict. | |
179 | for ac_kw in __restrict __restrict__ _Restrict restrict; do | |
180 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM( | |
181 | [[typedef int * int_ptr; | |
1cd4fffc LC |
182 | int foo (int_ptr $ac_kw ip) { |
183 | return ip[0]; | |
103dc4d4 LC |
184 | }]], |
185 | [[int s[1]; | |
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186 | int * $ac_kw t = s; |
187 | t[0] = 0; | |
188 | return foo(t)]])], | |
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189 | [ac_cv_c_restrict=$ac_kw]) |
190 | test "$ac_cv_c_restrict" != no && break | |
191 | done | |
192 | ]) | |
193 | AH_VERBATIM([restrict], | |
194 | [/* Define to the equivalent of the C99 'restrict' keyword, or to | |
195 | nothing if this is not supported. Do not define if restrict is | |
196 | supported directly. */ | |
197 | #undef restrict | |
198 | /* Work around a bug in Sun C++: it does not support _Restrict, even | |
199 | though the corresponding Sun C compiler does, which causes | |
200 | "#define restrict _Restrict" in the previous line. Perhaps some future | |
201 | version of Sun C++ will work with _Restrict; if so, it'll probably | |
202 | define __RESTRICT, just as Sun C does. */ | |
203 | #if defined __SUNPRO_CC && !defined __RESTRICT | |
204 | # define _Restrict | |
205 | #endif]) | |
206 | case $ac_cv_c_restrict in | |
207 | restrict) ;; | |
208 | no) AC_DEFINE([restrict], []) ;; | |
209 | *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;; | |
210 | esac | |
211 | ]) | |
a927b6c1 | 212 | ]) |
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213 | |
214 | # gl_BIGENDIAN | |
215 | # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd. | |
216 | # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some | |
217 | # macros invoke AC_C_BIGENDIAN with arguments. | |
218 | AC_DEFUN([gl_BIGENDIAN], | |
219 | [ | |
220 | AC_C_BIGENDIAN | |
221 | ]) | |
222 | ||
223 | # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it) | |
224 | # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not | |
225 | # output a spurious "(cached)" mark in the midst of other configure output. | |
226 | # This macro should be used instead of AC_CACHE_VAL when it is not surrounded | |
227 | # by an AC_MSG_CHECKING/AC_MSG_RESULT pair. | |
228 | AC_DEFUN([gl_CACHE_VAL_SILENT], | |
229 | [ | |
230 | saved_as_echo_n="$as_echo_n" | |
231 | as_echo_n=':' | |
232 | AC_CACHE_VAL([$1], [$2]) | |
233 | as_echo_n="$saved_as_echo_n" | |
234 | ]) |