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05730648 | 1 | # gnulib-common.m4 serial 33 |
caf8a9b2 | 2 | dnl Copyright (C) 2007-2012 Free Software Foundation, Inc. |
743c80a7 PE |
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], [ | |
24e0f6b1 | 15 | AH_VERBATIM([_Noreturn], |
caf8a9b2 PE |
16 | [/* The _Noreturn keyword of C11. */ |
17 | #if ! (defined _Noreturn \ | |
18 | || (defined __STDC_VERSION__ && 201112 <= __STDC_VERSION__)) | |
24e0f6b1 PE |
19 | # if (3 <= __GNUC__ || (__GNUC__ == 2 && 8 <= __GNUC_MINOR__) \ |
20 | || 0x5110 <= __SUNPRO_C) | |
21 | # define _Noreturn __attribute__ ((__noreturn__)) | |
caf8a9b2 | 22 | # elif defined _MSC_VER && 1200 <= _MSC_VER |
24e0f6b1 PE |
23 | # define _Noreturn __declspec (noreturn) |
24 | # else | |
25 | # define _Noreturn | |
26 | # endif | |
27 | #endif | |
28 | ]) | |
743c80a7 PE |
29 | AH_VERBATIM([isoc99_inline], |
30 | [/* Work around a bug in Apple GCC 4.0.1 build 5465: In C99 mode, it supports | |
31 | the ISO C 99 semantics of 'extern inline' (unlike the GNU C semantics of | |
32 | earlier versions), but does not display it by setting __GNUC_STDC_INLINE__. | |
05730648 | 33 | __APPLE__ && __MACH__ test for Mac OS X. |
743c80a7 PE |
34 | __APPLE_CC__ tests for the Apple compiler and its version. |
35 | __STDC_VERSION__ tests for the C99 mode. */ | |
36 | #if defined __APPLE__ && defined __MACH__ && __APPLE_CC__ >= 5465 && !defined __cplusplus && __STDC_VERSION__ >= 199901L && !defined __GNUC_STDC_INLINE__ | |
37 | # define __GNUC_STDC_INLINE__ 1 | |
38 | #endif]) | |
39 | AH_VERBATIM([unused_parameter], | |
40 | [/* Define as a marker that can be attached to declarations that might not | |
41 | be used. This helps to reduce warnings, such as from | |
42 | GCC -Wunused-parameter. */ | |
43 | #if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7) | |
44 | # define _GL_UNUSED __attribute__ ((__unused__)) | |
45 | #else | |
46 | # define _GL_UNUSED | |
47 | #endif | |
48 | /* The name _UNUSED_PARAMETER_ is an earlier spelling, although the name | |
49 | is a misnomer outside of parameter lists. */ | |
50 | #define _UNUSED_PARAMETER_ _GL_UNUSED | |
9afafefb PE |
51 | |
52 | /* The __pure__ attribute was added in gcc 2.96. */ | |
53 | #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96) | |
54 | # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__)) | |
55 | #else | |
56 | # define _GL_ATTRIBUTE_PURE /* empty */ | |
57 | #endif | |
58 | ||
59 | /* The __const__ attribute was added in gcc 2.95. */ | |
60 | #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95) | |
61 | # define _GL_ATTRIBUTE_CONST __attribute__ ((__const__)) | |
62 | #else | |
63 | # define _GL_ATTRIBUTE_CONST /* empty */ | |
64 | #endif | |
743c80a7 PE |
65 | ]) |
66 | dnl Preparation for running test programs: | |
67 | dnl Tell glibc to write diagnostics from -D_FORTIFY_SOURCE=2 to stderr, not | |
68 | dnl to /dev/tty, so they can be redirected to log files. Such diagnostics | |
69 | dnl arise e.g., in the macros gl_PRINTF_DIRECTIVE_N, gl_SNPRINTF_DIRECTIVE_N. | |
70 | LIBC_FATAL_STDERR_=1 | |
71 | export LIBC_FATAL_STDERR_ | |
72 | ]) | |
73 | ||
74 | # gl_MODULE_INDICATOR_CONDITION | |
75 | # expands to a C preprocessor expression that evaluates to 1 or 0, depending | |
76 | # whether a gnulib module that has been requested shall be considered present | |
77 | # or not. | |
7e2aa385 | 78 | m4_define([gl_MODULE_INDICATOR_CONDITION], [1]) |
743c80a7 PE |
79 | |
80 | # gl_MODULE_INDICATOR_SET_VARIABLE([modulename]) | |
81 | # sets the shell variable that indicates the presence of the given module to | |
82 | # a C preprocessor expression that will evaluate to 1. | |
83 | AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE], | |
84 | [ | |
7e2aa385 PE |
85 | gl_MODULE_INDICATOR_SET_VARIABLE_AUX( |
86 | [GNULIB_[]m4_translit([[$1]], | |
87 | [abcdefghijklmnopqrstuvwxyz./-], | |
88 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])], | |
89 | [gl_MODULE_INDICATOR_CONDITION]) | |
90 | ]) | |
91 | ||
92 | # gl_MODULE_INDICATOR_SET_VARIABLE_AUX([variable]) | |
93 | # modifies the shell variable to include the gl_MODULE_INDICATOR_CONDITION. | |
94 | # The shell variable's value is a C preprocessor expression that evaluates | |
95 | # to 0 or 1. | |
96 | AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX], | |
97 | [ | |
98 | m4_if(m4_defn([gl_MODULE_INDICATOR_CONDITION]), [1], | |
99 | [ | |
100 | dnl Simplify the expression VALUE || 1 to 1. | |
101 | $1=1 | |
102 | ], | |
103 | [gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([$1], | |
104 | [gl_MODULE_INDICATOR_CONDITION])]) | |
105 | ]) | |
106 | ||
107 | # gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR([variable], [condition]) | |
108 | # modifies the shell variable to include the given condition. The shell | |
109 | # variable's value is a C preprocessor expression that evaluates to 0 or 1. | |
110 | AC_DEFUN([gl_MODULE_INDICATOR_SET_VARIABLE_AUX_OR], | |
111 | [ | |
112 | dnl Simplify the expression 1 || CONDITION to 1. | |
113 | if test "$[]$1" != 1; then | |
114 | dnl Simplify the expression 0 || CONDITION to CONDITION. | |
115 | if test "$[]$1" = 0; then | |
116 | $1=$2 | |
117 | else | |
118 | $1="($[]$1 || $2)" | |
119 | fi | |
120 | fi | |
743c80a7 PE |
121 | ]) |
122 | ||
123 | # gl_MODULE_INDICATOR([modulename]) | |
124 | # defines a C macro indicating the presence of the given module | |
125 | # in a location where it can be used. | |
126 | # | Value | Value | | |
127 | # | in lib/ | in tests/ | | |
128 | # --------------------------------------------+---------+-----------+ | |
129 | # Module present among main modules: | 1 | 1 | | |
130 | # --------------------------------------------+---------+-----------+ | |
131 | # Module present among tests-related modules: | 0 | 1 | | |
132 | # --------------------------------------------+---------+-----------+ | |
133 | # Module not present at all: | 0 | 0 | | |
134 | # --------------------------------------------+---------+-----------+ | |
135 | AC_DEFUN([gl_MODULE_INDICATOR], | |
136 | [ | |
137 | AC_DEFINE_UNQUOTED([GNULIB_]m4_translit([[$1]], | |
138 | [abcdefghijklmnopqrstuvwxyz./-], | |
139 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), | |
140 | [gl_MODULE_INDICATOR_CONDITION], | |
141 | [Define to a C preprocessor expression that evaluates to 1 or 0, | |
142 | depending whether the gnulib module $1 shall be considered present.]) | |
143 | ]) | |
144 | ||
145 | # gl_MODULE_INDICATOR_FOR_TESTS([modulename]) | |
146 | # defines a C macro indicating the presence of the given module | |
147 | # in lib or tests. This is useful to determine whether the module | |
148 | # should be tested. | |
149 | # | Value | Value | | |
150 | # | in lib/ | in tests/ | | |
151 | # --------------------------------------------+---------+-----------+ | |
152 | # Module present among main modules: | 1 | 1 | | |
153 | # --------------------------------------------+---------+-----------+ | |
154 | # Module present among tests-related modules: | 1 | 1 | | |
155 | # --------------------------------------------+---------+-----------+ | |
156 | # Module not present at all: | 0 | 0 | | |
157 | # --------------------------------------------+---------+-----------+ | |
158 | AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], | |
159 | [ | |
160 | AC_DEFINE([GNULIB_TEST_]m4_translit([[$1]], | |
161 | [abcdefghijklmnopqrstuvwxyz./-], | |
162 | [ABCDEFGHIJKLMNOPQRSTUVWXYZ___]), [1], | |
163 | [Define to 1 when the gnulib module $1 should be tested.]) | |
164 | ]) | |
165 | ||
d6974efa PE |
166 | # gl_ASSERT_NO_GNULIB_POSIXCHECK |
167 | # asserts that there will never be a need to #define GNULIB_POSIXCHECK. | |
168 | # and thereby enables an optimization of configure and config.h. | |
169 | # Used by Emacs. | |
170 | AC_DEFUN([gl_ASSERT_NO_GNULIB_POSIXCHECK], | |
171 | [ | |
172 | dnl Override gl_WARN_ON_USE_PREPARE. | |
63139bfa PE |
173 | dnl But hide this definition from 'aclocal'. |
174 | AC_DEFUN([gl_W][ARN_ON_USE_PREPARE], []) | |
d6974efa PE |
175 | ]) |
176 | ||
b06b1098 PE |
177 | # gl_ASSERT_NO_GNULIB_TESTS |
178 | # asserts that there will be no gnulib tests in the scope of the configure.ac | |
179 | # and thereby enables an optimization of config.h. | |
180 | # Used by Emacs. | |
181 | AC_DEFUN([gl_ASSERT_NO_GNULIB_TESTS], | |
182 | [ | |
183 | dnl Override gl_MODULE_INDICATOR_FOR_TESTS. | |
184 | AC_DEFUN([gl_MODULE_INDICATOR_FOR_TESTS], []) | |
185 | ]) | |
186 | ||
743c80a7 PE |
187 | # Test whether <features.h> exists. |
188 | # Set HAVE_FEATURES_H. | |
189 | AC_DEFUN([gl_FEATURES_H], | |
190 | [ | |
191 | AC_CHECK_HEADERS_ONCE([features.h]) | |
192 | if test $ac_cv_header_features_h = yes; then | |
193 | HAVE_FEATURES_H=1 | |
194 | else | |
195 | HAVE_FEATURES_H=0 | |
196 | fi | |
197 | AC_SUBST([HAVE_FEATURES_H]) | |
198 | ]) | |
199 | ||
200 | # m4_foreach_w | |
201 | # is a backport of autoconf-2.59c's m4_foreach_w. | |
202 | # Remove this macro when we can assume autoconf >= 2.60. | |
203 | m4_ifndef([m4_foreach_w], | |
204 | [m4_define([m4_foreach_w], | |
205 | [m4_foreach([$1], m4_split(m4_normalize([$2]), [ ]), [$3])])]) | |
206 | ||
207 | # AS_VAR_IF(VAR, VALUE, [IF-MATCH], [IF-NOT-MATCH]) | |
208 | # ---------------------------------------------------- | |
209 | # Backport of autoconf-2.63b's macro. | |
210 | # Remove this macro when we can assume autoconf >= 2.64. | |
211 | m4_ifndef([AS_VAR_IF], | |
212 | [m4_define([AS_VAR_IF], | |
213 | [AS_IF([test x"AS_VAR_GET([$1])" = x""$2], [$3], [$4])])]) | |
214 | ||
d47439a3 PE |
215 | # gl_PROG_CC_C99 |
216 | # Modifies the value of the shell variable CC in an attempt to make $CC | |
217 | # understand ISO C99 source code. | |
218 | # This is like AC_PROG_CC_C99, except that | |
219 | # - AC_PROG_CC_C99 did not exist in Autoconf versions < 2.60, | |
220 | # - AC_PROG_CC_C99 does not mix well with AC_PROG_CC_STDC | |
221 | # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00367.html>, | |
222 | # but many more packages use AC_PROG_CC_STDC than AC_PROG_CC_C99 | |
223 | # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00441.html>. | |
224 | # Remaining problems: | |
225 | # - When AC_PROG_CC_STDC is invoked twice, it adds the C99 enabling options | |
226 | # to CC twice | |
227 | # <http://lists.gnu.org/archive/html/bug-gnulib/2011-09/msg00431.html>. | |
caf8a9b2 | 228 | # - AC_PROG_CC_STDC is likely to change now that C11 is an ISO standard. |
d47439a3 PE |
229 | AC_DEFUN([gl_PROG_CC_C99], |
230 | [ | |
231 | dnl Change that version number to the minimum Autoconf version that supports | |
232 | dnl mixing AC_PROG_CC_C99 calls with AC_PROG_CC_STDC calls. | |
233 | m4_version_prereq([9.0], | |
234 | [AC_REQUIRE([AC_PROG_CC_C99])], | |
235 | [AC_REQUIRE([AC_PROG_CC_STDC])]) | |
236 | ]) | |
237 | ||
7f59d9c8 PE |
238 | # gl_PROG_AR_RANLIB |
239 | # Determines the values for AR, ARFLAGS, RANLIB that fit with the compiler. | |
240 | # The user can set the variables AR, ARFLAGS, RANLIB if he wants to override | |
241 | # the values. | |
242 | AC_DEFUN([gl_PROG_AR_RANLIB], | |
243 | [ | |
244 | dnl Minix 3 comes with two toolchains: The Amsterdam Compiler Kit compiler | |
245 | dnl as "cc", and GCC as "gcc". They have different object file formats and | |
246 | dnl library formats. In particular, the GNU binutils programs ar, ranlib | |
247 | dnl produce libraries that work only with gcc, not with cc. | |
248 | AC_REQUIRE([AC_PROG_CC]) | |
249 | AC_CACHE_CHECK([for Minix Amsterdam compiler], [gl_cv_c_amsterdam_compiler], | |
250 | [ | |
251 | AC_EGREP_CPP([Amsterdam], | |
252 | [ | |
253 | #ifdef __ACK__ | |
254 | Amsterdam | |
255 | #endif | |
256 | ], | |
257 | [gl_cv_c_amsterdam_compiler=yes], | |
258 | [gl_cv_c_amsterdam_compiler=no]) | |
259 | ]) | |
260 | if test -z "$AR"; then | |
261 | if test $gl_cv_c_amsterdam_compiler = yes; then | |
262 | AR='cc -c.a' | |
263 | if test -z "$ARFLAGS"; then | |
264 | ARFLAGS='-o' | |
265 | fi | |
266 | else | |
267 | dnl Use the Automake-documented default values for AR and ARFLAGS, | |
268 | dnl but prefer ${host}-ar over ar (useful for cross-compiling). | |
269 | AC_CHECK_TOOL([AR], [ar], [ar]) | |
270 | if test -z "$ARFLAGS"; then | |
271 | ARFLAGS='cru' | |
272 | fi | |
273 | fi | |
274 | else | |
275 | if test -z "$ARFLAGS"; then | |
276 | ARFLAGS='cru' | |
277 | fi | |
278 | fi | |
279 | AC_SUBST([AR]) | |
280 | AC_SUBST([ARFLAGS]) | |
281 | if test -z "$RANLIB"; then | |
282 | if test $gl_cv_c_amsterdam_compiler = yes; then | |
283 | RANLIB=':' | |
284 | else | |
285 | dnl Use the ranlib program if it is available. | |
286 | AC_PROG_RANLIB | |
287 | fi | |
288 | fi | |
289 | AC_SUBST([RANLIB]) | |
290 | ]) | |
291 | ||
743c80a7 PE |
292 | # AC_PROG_MKDIR_P |
293 | # is a backport of autoconf-2.60's AC_PROG_MKDIR_P, with a fix | |
294 | # for interoperability with automake-1.9.6 from autoconf-2.62. | |
295 | # Remove this macro when we can assume autoconf >= 2.62 or | |
296 | # autoconf >= 2.60 && automake >= 1.10. | |
297 | m4_ifdef([AC_PROG_MKDIR_P], [ | |
298 | dnl For automake-1.9.6 && autoconf < 2.62: Ensure MKDIR_P is AC_SUBSTed. | |
299 | m4_define([AC_PROG_MKDIR_P], | |
300 | m4_defn([AC_PROG_MKDIR_P])[ | |
301 | AC_SUBST([MKDIR_P])])], [ | |
302 | dnl For autoconf < 2.60: Backport of AC_PROG_MKDIR_P. | |
303 | AC_DEFUN_ONCE([AC_PROG_MKDIR_P], | |
304 | [AC_REQUIRE([AM_PROG_MKDIR_P])dnl defined by automake | |
305 | MKDIR_P='$(mkdir_p)' | |
306 | AC_SUBST([MKDIR_P])])]) | |
307 | ||
308 | # AC_C_RESTRICT | |
309 | # This definition overrides the AC_C_RESTRICT macro from autoconf 2.60..2.61, | |
310 | # so that mixed use of GNU C and GNU C++ and mixed use of Sun C and Sun C++ | |
311 | # works. | |
312 | # This definition can be removed once autoconf >= 2.62 can be assumed. | |
313 | m4_if(m4_version_compare(m4_defn([m4_PACKAGE_VERSION]),[2.62]),[-1],[ | |
314 | AC_DEFUN([AC_C_RESTRICT], | |
315 | [AC_CACHE_CHECK([for C/C++ restrict keyword], [ac_cv_c_restrict], | |
316 | [ac_cv_c_restrict=no | |
317 | # The order here caters to the fact that C++ does not require restrict. | |
318 | for ac_kw in __restrict __restrict__ _Restrict restrict; do | |
319 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM( | |
320 | [[typedef int * int_ptr; | |
321 | int foo (int_ptr $ac_kw ip) { | |
322 | return ip[0]; | |
323 | }]], | |
324 | [[int s[1]; | |
325 | int * $ac_kw t = s; | |
326 | t[0] = 0; | |
327 | return foo(t)]])], | |
328 | [ac_cv_c_restrict=$ac_kw]) | |
329 | test "$ac_cv_c_restrict" != no && break | |
330 | done | |
331 | ]) | |
332 | AH_VERBATIM([restrict], | |
333 | [/* Define to the equivalent of the C99 'restrict' keyword, or to | |
334 | nothing if this is not supported. Do not define if restrict is | |
335 | supported directly. */ | |
336 | #undef restrict | |
337 | /* Work around a bug in Sun C++: it does not support _Restrict, even | |
338 | though the corresponding Sun C compiler does, which causes | |
339 | "#define restrict _Restrict" in the previous line. Perhaps some future | |
340 | version of Sun C++ will work with _Restrict; if so, it'll probably | |
341 | define __RESTRICT, just as Sun C does. */ | |
342 | #if defined __SUNPRO_CC && !defined __RESTRICT | |
343 | # define _Restrict | |
344 | #endif]) | |
345 | case $ac_cv_c_restrict in | |
346 | restrict) ;; | |
347 | no) AC_DEFINE([restrict], []) ;; | |
348 | *) AC_DEFINE_UNQUOTED([restrict], [$ac_cv_c_restrict]) ;; | |
349 | esac | |
350 | ]) | |
351 | ]) | |
352 | ||
353 | # gl_BIGENDIAN | |
354 | # is like AC_C_BIGENDIAN, except that it can be AC_REQUIREd. | |
355 | # Note that AC_REQUIRE([AC_C_BIGENDIAN]) does not work reliably because some | |
356 | # macros invoke AC_C_BIGENDIAN with arguments. | |
357 | AC_DEFUN([gl_BIGENDIAN], | |
358 | [ | |
359 | AC_C_BIGENDIAN | |
360 | ]) | |
361 | ||
362 | # gl_CACHE_VAL_SILENT(cache-id, command-to-set-it) | |
363 | # is like AC_CACHE_VAL(cache-id, command-to-set-it), except that it does not | |
364 | # output a spurious "(cached)" mark in the midst of other configure output. | |
365 | # This macro should be used instead of AC_CACHE_VAL when it is not surrounded | |
366 | # by an AC_MSG_CHECKING/AC_MSG_RESULT pair. | |
367 | AC_DEFUN([gl_CACHE_VAL_SILENT], | |
368 | [ | |
369 | saved_as_echo_n="$as_echo_n" | |
370 | as_echo_n=':' | |
371 | AC_CACHE_VAL([$1], [$2]) | |
372 | as_echo_n="$saved_as_echo_n" | |
373 | ]) |