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7e2aa385 | 1 | # gnulib-common.m4 serial 26 |
743c80a7 PE |
2 | dnl Copyright (C) 2007-2011 Free Software Foundation, Inc. |
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. | |
11 | AC_REQUIRE([gl_00GNULIB]) | |
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]) | |
25 | AH_VERBATIM([unused_parameter], | |
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. */ | |
29 | #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7) | |
30 | # define _GL_UNUSED __attribute__ ((__unused__)) | |
31 | #else | |
32 | # define _GL_UNUSED | |
33 | #endif | |
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 | |
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37 | |
38 | /* The __pure__ attribute was added in gcc 2.96. */ | |
39 | #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) | |
40 | # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__)) | |
41 | #else | |
42 | # define _GL_ATTRIBUTE_PURE /* empty */ | |
43 | #endif | |
44 | ||
45 | /* The __const__ attribute was added in gcc 2.95. */ | |
46 | #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95) | |
47 | # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__)) | |
48 | #else | |
49 | # define _GL_ATTRIBUTE_CONST /* empty */ | |
50 | #endif | |
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51 | ]) |
52 | dnl Preparation for running test programs: | |
53 | dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not | |
54 | dnl to /dev/tty, so they can be redirected to log files. Such diagnostics | |
55 | dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N. | |
56 | LIBC_FATAL_STDERR_=1 | |
57 | export LIBC_FATAL_STDERR_ | |
58 | ]) | |
59 | ||
60 | # gl_MODULE_INDICATOR_CONDITION | |
61 | # expands to a C preprocessor expression that evaluates to 1 or 0, depending | |
62 | # whether a gnulib module that has been requested shall be considered present | |
63 | # or not. | |
7e2aa385 | 64 | m4_define([gl_MODULE_INDICATOR_CONDITION], [1]) |
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65 | |
66 | # gl_MODULE_INDICATOR_SET_VARIABLE([modulename]) | |
67 | # sets the shell variable that indicates the presence of the given module to | |
68 | # a C preprocessor expression that will evaluate to 1. | |
69 | AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE], | |
70 | [ | |
7e2aa385 PE |
71 | gl_MODULE_INDICATOR_SET_VARIABLE_AUX( |
72 | [GNULIB_[]m4_translit([[$1]], | |
73 | [abcdefghijklmnopqrstuvwxyz./-], | |
74 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])], | |
75 | [gl_MODULE_INDICATOR_CONDITION]) | |
76 | ]) | |
77 | ||
78 | # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable]) | |
79 | # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION. | |
80 | # The shell variable's value is a C preprocessor expression that evaluates | |
81 | # to 0 or 1. | |
82 | AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX], | |
83 | [ | |
84 | m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1], | |
85 | [ | |
86 | dnl Simplify the expression VALUE || 1 to 1. | |
87 | $1=1 | |
88 | ], | |
89 | [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1], | |
90 | [gl_MODULE_INDICATOR_CONDITION])]) | |
91 | ]) | |
92 | ||
93 | # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition]) | |
94 | # modifies the shell variable to include the given condition. The shell | |
95 | # variable's value is a C preprocessor expression that evaluates to 0 or 1. | |
96 | AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR], | |
97 | [ | |
98 | dnl Simplify the expression 1 || CONDITION to 1. | |
99 | if test "$[]$1" != 1; then | |
100 | dnl Simplify the expression 0 || CONDITION to CONDITION. | |
101 | if test "$[]$1" = 0; then | |
102 | $1=$2 | |
103 | else | |
104 | $1="($[]$1 || $2)" | |
105 | fi | |
106 | fi | |
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107 | ]) |
108 | ||
109 | # gl_MODULE_INDICATOR([modulename]) | |
110 | # defines a C macro indicating the presence of the given module | |
111 | # in a location where it can be used. | |
112 | # | Value | Value | | |
113 | # | in lib/ | in tests/ | | |
114 | # --------------------------------------------+---------+-----------+ | |
115 | # Module present among main modules: | 1 | 1 | | |
116 | # --------------------------------------------+---------+-----------+ | |
117 | # Module present among tests-related modules: | 0 | 1 | | |
118 | # --------------------------------------------+---------+-----------+ | |
119 | # Module not present at all: | 0 | 0 | | |
120 | # --------------------------------------------+---------+-----------+ | |
121 | AC_DEFUN([gl_MODULE_INDICATOR], | |
122 | [ | |
123 | AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]], | |
124 | [abcdefghijklmnopqrstuvwxyz./-], | |
125 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), | |
126 | [gl_MODULE_INDICATOR_CONDITION], | |
127 | [Define to a C preprocessor expression that evaluates to 1 or 0, | |
128 | depending whether the gnulib module $1 shall be considered present.]) | |
129 | ]) | |
130 | ||
131 | # gl_MODULE_INDICATOR_FOR_TESTS([modulename]) | |
132 | # defines a C macro indicating the presence of the given module | |
133 | # in lib or tests. This is useful to determine whether the module | |
134 | # should be tested. | |
135 | # | Value | Value | | |
136 | # | in lib/ | in tests/ | | |
137 | # --------------------------------------------+---------+-----------+ | |
138 | # Module present among main modules: | 1 | 1 | | |
139 | # --------------------------------------------+---------+-----------+ | |
140 | # Module present among tests-related modules: | 1 | 1 | | |
141 | # --------------------------------------------+---------+-----------+ | |
142 | # Module not present at all: | 0 | 0 | | |
143 | # --------------------------------------------+---------+-----------+ | |
144 | AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], | |
145 | [ | |
146 | AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]], | |
147 | [abcdefghijklmnopqrstuvwxyz./-], | |
148 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1], | |
149 | [Define to 1 when the gnulib module $1 should be tested.]) | |
150 | ]) | |
151 | ||
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152 | # gl_ASSERT_NO_GNULIB_POSIXCHECK |
153 | # asserts that there will never be a need to #define GNULIB_POSIXCHECK. | |
154 | # and thereby enables an optimization of configure and config.h. | |
155 | # Used by Emacs. | |
156 | AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK], | |
157 | [ | |
158 | dnl Override gl_WARN_ON_USE_PREPARE. | |
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159 | dnl But hide this definition from 'aclocal'. |
160 | AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], []) | |
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161 | ]) |
162 | ||
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163 | # gl_ASSERT_NO_GNULIB_TESTS |
164 | # asserts that there will be no gnulib tests in the scope of the configure.ac | |
165 | # and thereby enables an optimization of config.h. | |
166 | # Used by Emacs. | |
167 | AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS], | |
168 | [ | |
169 | dnl Override gl_MODULE_INDICATOR_FOR_TESTS. | |
170 | AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], []) | |
171 | ]) | |
172 | ||
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173 | # Test whether <features.h> exists. |
174 | # Set HAVE_FEATURES_H. | |
175 | AC_DEFUN([gl_FEATURES_H], | |
176 | [ | |
177 | AC_CHECK_HEADERS_ONCE([features.h]) | |
178 | if test $ac_cv_header_features_h = yes; then | |
179 | HAVE_FEATURES_H=1 | |
180 | else | |
181 | HAVE_FEATURES_H=0 | |
182 | fi | |
183 | AC_SUBST([HAVE_FEATURES_H]) | |
184 | ]) | |
185 | ||
186 | # m4_foreach_w | |
187 | # is a backport of autoconf-2.59c's m4_foreach_w. | |
188 | # Remove this macro when we can assume autoconf >= 2.60. | |
189 | m4_ifndef([m4_foreach_w], | |
190 | [m4_define([m4_foreach_w], | |
191 | [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])]) | |
192 | ||
193 | # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH]) | |
194 | # ---------------------------------------------------- | |
195 | # Backport of autoconf-2.63b's macro. | |
196 | # Remove this macro when we can assume autoconf >= 2.64. | |
197 | m4_ifndef([AS_VAR_IF], | |
198 | [m4_define([AS_VAR_IF], | |
199 | [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])]) | |
200 | ||
201 | # AC_PROG_MKDIR_P | |
202 | # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix | |
203 | # for interoperability with automake-1.9.6 from autoconf-2.62. | |
204 | # Remove this macro when we can assume autoconf >= 2.62 or | |
205 | # autoconf >= 2.60 && automake >= 1.10. | |
206 | m4_ifdef([AC_PROG_MKDIR_P], [ | |
207 | dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed. | |
208 | m4_define([AC_PROG_MKDIR_P], | |
209 | m4_defn([AC_PROG_MKDIR_P])[ | |
210 | AC_SUBST([MKDIR_P])])], [ | |
211 | dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P. | |
212 | AC_DEFUN_ONCE([AC_PROG_MKDIR_P], | |
213 | [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake | |
214 | MKDIR_P='$(mkdir_p)' | |
215 | AC_SUBST([MKDIR_P])])]) | |
216 | ||
217 | # AC_C_RESTRICT | |
218 | # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61, | |
219 | # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++ | |
220 | # works. | |
221 | # This definition can be removed once autoconf >= 2.62 can be assumed. | |
222 | m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[ | |
223 | AC_DEFUN([AC_C_RESTRICT], | |
224 | [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict], | |
225 | [ac_cv_c_restrict=no | |
226 | # The order here caters to the fact that C++ does not require restrict. | |
227 | for ac_kw in __restrict __restrict__ _Restrict restrict; do | |
228 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM( | |
229 | [[typedef int * int_ptr; | |
230 | int foo (int_ptr $ac_kw ip) { | |
231 | return ip[0]; | |
232 | }]], | |
233 | [[int s[1]; | |
234 | int * $ac_kw t = s; | |
235 | t[0] = 0; | |
236 | return foo(t)]])], | |
237 | [ac_cv_c_restrict=$ac_kw]) | |
238 | test "$ac_cv_c_restrict" != no && break | |
239 | done | |
240 | ]) | |
241 | AH_VERBATIM([restrict], | |
242 | [/* Define to the equivalent of the C99 'restrict' keyword, or to | |
243 | nothing if this is not supported. Do not define if restrict is | |
244 | supported directly. */ | |
245 | #undef restrict | |
246 | /* Work around a bug in Sun C++: it does not support _Restrict, even | |
247 | though the corresponding Sun C compiler does, which causes | |
248 | "#define restrict _Restrict" in the previous line. Perhaps some future | |
249 | version of Sun C++ will work with _Restrict; if so, it'll probably | |
250 | define __RESTRICT, just as Sun C does. */ | |
251 | #if defined __SUNPRO_CC && !defined __RESTRICT | |
252 | # define _Restrict | |
253 | #endif]) | |
254 | case $ac_cv_c_restrict in | |
255 | restrict) ;; | |
256 | no) AC_DEFINE([restrict], []) ;; | |
257 | *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;; | |
258 | esac | |
259 | ]) | |
260 | ]) | |
261 | ||
262 | # gl_BIGENDIAN | |
263 | # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd. | |
264 | # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some | |
265 | # macros invoke AC_C_BIGENDIAN with arguments. | |
266 | AC_DEFUN([gl_BIGENDIAN], | |
267 | [ | |
268 | AC_C_BIGENDIAN | |
269 | ]) | |
270 | ||
271 | # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it) | |
272 | # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not | |
273 | # output a spurious "(cached)" mark in the midst of other configure output. | |
274 | # This macro should be used instead of AC_CACHE_VAL when it is not surrounded | |
275 | # by an AC_MSG_CHECKING/AC_MSG_RESULT pair. | |
276 | AC_DEFUN([gl_CACHE_VAL_SILENT], | |
277 | [ | |
278 | saved_as_echo_n="$as_echo_n" | |
279 | as_echo_n=':' | |
280 | AC_CACHE_VAL([$1], [$2]) | |
281 | as_echo_n="$saved_as_echo_n" | |
282 | ]) |