]>
Commit | Line | Data |
---|---|---|
47be870b LP |
1 | dnl Macros to check the presence of generic (non-typed) symbols. |
2 | dnl Copyright (c) 2006-2008 Diego Pettenò <flameeyes@gmail.com> | |
3 | dnl Copyright (c) 2006-2008 xine project | |
eb2e280f | 4 | dnl Copyright (c) 2012 Lucas De Marchi <lucas.de.marchi@gmail.com> |
47be870b LP |
5 | dnl |
6 | dnl This program is free software; you can redistribute it and/or modify | |
7 | dnl it under the terms of the GNU General Public License as published by | |
8 | dnl the Free Software Foundation; either version 2, or (at your option) | |
9 | dnl any later version. | |
10 | dnl | |
11 | dnl This program is distributed in the hope that it will be useful, | |
12 | dnl but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | dnl GNU General Public License for more details. | |
15 | dnl | |
16 | dnl You should have received a copy of the GNU General Public License | |
17 | dnl along with this program; if not, write to the Free Software | |
18 | dnl Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
19 | dnl 02110-1301, USA. | |
20 | dnl | |
21 | dnl As a special exception, the copyright owners of the | |
22 | dnl macro gives unlimited permission to copy, distribute and modify the | |
23 | dnl configure scripts that are the output of Autoconf when processing the | |
24 | dnl Macro. You need not follow the terms of the GNU General Public | |
25 | dnl License when using or distributing such scripts, even though portions | |
26 | dnl of the text of the Macro appear in them. The GNU General Public | |
27 | dnl License (GPL) does govern all other use of the material that | |
28 | dnl constitutes the Autoconf Macro. | |
29 | dnl | |
30 | dnl This special exception to the GPL applies to versions of the | |
31 | dnl Autoconf Macro released by this project. When you make and | |
32 | dnl distribute a modified version of the Autoconf Macro, you may extend | |
33 | dnl this special exception to the GPL to apply to your modified version as | |
34 | dnl well. | |
35 | ||
eb2e280f | 36 | dnl Check if FLAG in ENV-VAR is supported by compiler and append it |
43bbf1ac | 37 | dnl to WHERE-TO-APPEND variable. Note that we invert -Wno-* checks to |
a01a4517 FB |
38 | dnl -W* as gcc cannot test for negated warnings. If a C snippet is passed, |
39 | dnl use it, otherwise use a simple main() definition that just returns 0. | |
40 | dnl CC_CHECK_FLAG_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG], [C-SNIPPET]) | |
47be870b | 41 | |
eb2e280f LDM |
42 | AC_DEFUN([CC_CHECK_FLAG_APPEND], [ |
43 | AC_CACHE_CHECK([if $CC supports flag $3 in envvar $2], | |
44 | AS_TR_SH([cc_cv_$2_$3]), | |
e9c1ea9d | 45 | [eval "AS_TR_SH([cc_save_$2])='${$2}'" |
43bbf1ac | 46 | eval "AS_TR_SH([$2])='-Werror `echo "$3" | sed 's/^-Wno-/-W/'`'" |
a01a4517 FB |
47 | AC_LINK_IFELSE([AC_LANG_SOURCE(ifelse([$4], [], |
48 | [int main(void) { return 0; } ], | |
49 | [$4]))], | |
d8c8508b DH |
50 | [eval "AS_TR_SH([cc_cv_$2_$3])='yes'"], |
51 | [eval "AS_TR_SH([cc_cv_$2_$3])='no'"]) | |
e9c1ea9d | 52 | eval "AS_TR_SH([$2])='$cc_save_$2'"]) |
47be870b | 53 | |
eb2e280f LDM |
54 | AS_IF([eval test x$]AS_TR_SH([cc_cv_$2_$3])[ = xyes], |
55 | [eval "$1='${$1} $3'"]) | |
47be870b LP |
56 | ]) |
57 | ||
a01a4517 | 58 | dnl CC_CHECK_FLAGS_APPEND([WHERE-TO-APPEND], [ENV-VAR], [FLAG1 FLAG2], [C-SNIPPET]) |
eb2e280f | 59 | AC_DEFUN([CC_CHECK_FLAGS_APPEND], [ |
6a937f06 | 60 | for flag in [$3]; do |
a01a4517 | 61 | CC_CHECK_FLAG_APPEND([$1], [$2], $flag, [$4]) |
47be870b LP |
62 | done |
63 | ]) | |
64 | ||
65 | dnl Check if the flag is supported by linker (cacheable) | |
66 | dnl CC_CHECK_LDFLAGS([FLAG], [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND]) | |
67 | ||
68 | AC_DEFUN([CC_CHECK_LDFLAGS], [ | |
69 | AC_CACHE_CHECK([if $CC supports $1 flag], | |
70 | AS_TR_SH([cc_cv_ldflags_$1]), | |
71 | [ac_save_LDFLAGS="$LDFLAGS" | |
72 | LDFLAGS="$LDFLAGS $1" | |
73 | AC_LINK_IFELSE([int main() { return 1; }], | |
74 | [eval "AS_TR_SH([cc_cv_ldflags_$1])='yes'"], | |
75 | [eval "AS_TR_SH([cc_cv_ldflags_$1])="]) | |
76 | LDFLAGS="$ac_save_LDFLAGS" | |
77 | ]) | |
78 | ||
79 | AS_IF([eval test x$]AS_TR_SH([cc_cv_ldflags_$1])[ = xyes], | |
80 | [$2], [$3]) | |
81 | ]) | |
82 | ||
83 | dnl define the LDFLAGS_NOUNDEFINED variable with the correct value for | |
84 | dnl the current linker to avoid undefined references in a shared object. | |
85 | AC_DEFUN([CC_NOUNDEFINED], [ | |
86 | dnl We check $host for which systems to enable this for. | |
87 | AC_REQUIRE([AC_CANONICAL_HOST]) | |
88 | ||
89 | case $host in | |
90 | dnl FreeBSD (et al.) does not complete linking for shared objects when pthreads | |
91 | dnl are requested, as different implementations are present; to avoid problems | |
92 | dnl use -Wl,-z,defs only for those platform not behaving this way. | |
93 | *-freebsd* | *-openbsd*) ;; | |
94 | *) | |
95 | dnl First of all check for the --no-undefined variant of GNU ld. This allows | |
3f85ef0f | 96 | dnl for a much more readable command line, so that people can understand what |
47be870b LP |
97 | dnl it does without going to look for what the heck -z defs does. |
98 | for possible_flags in "-Wl,--no-undefined" "-Wl,-z,defs"; do | |
e9c1ea9d JSJ |
99 | CC_CHECK_LDFLAGS([$possible_flags], [LDFLAGS_NOUNDEFINED="$possible_flags"]) |
100 | break | |
47be870b | 101 | done |
e9c1ea9d | 102 | ;; |
47be870b LP |
103 | esac |
104 | ||
105 | AC_SUBST([LDFLAGS_NOUNDEFINED]) | |
106 | ]) | |
107 | ||
108 | dnl Check for a -Werror flag or equivalent. -Werror is the GCC | |
109 | dnl and ICC flag that tells the compiler to treat all the warnings | |
110 | dnl as fatal. We usually need this option to make sure that some | |
111 | dnl constructs (like attributes) are not simply ignored. | |
112 | dnl | |
113 | dnl Other compilers don't support -Werror per se, but they support | |
114 | dnl an equivalent flag: | |
115 | dnl - Sun Studio compiler supports -errwarn=%all | |
116 | AC_DEFUN([CC_CHECK_WERROR], [ | |
117 | AC_CACHE_CHECK( | |
118 | [for $CC way to treat warnings as errors], | |
119 | [cc_cv_werror], | |
120 | [CC_CHECK_CFLAGS_SILENT([-Werror], [cc_cv_werror=-Werror], | |
121 | [CC_CHECK_CFLAGS_SILENT([-errwarn=%all], [cc_cv_werror=-errwarn=%all])]) | |
122 | ]) | |
123 | ]) | |
124 | ||
125 | AC_DEFUN([CC_CHECK_ATTRIBUTE], [ | |
126 | AC_REQUIRE([CC_CHECK_WERROR]) | |
127 | AC_CACHE_CHECK([if $CC supports __attribute__(( ifelse([$2], , [$1], [$2]) ))], | |
128 | AS_TR_SH([cc_cv_attribute_$1]), | |
129 | [ac_save_CFLAGS="$CFLAGS" | |
130 | CFLAGS="$CFLAGS $cc_cv_werror" | |
c1851444 | 131 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([$3])], |
47be870b LP |
132 | [eval "AS_TR_SH([cc_cv_attribute_$1])='yes'"], |
133 | [eval "AS_TR_SH([cc_cv_attribute_$1])='no'"]) | |
134 | CFLAGS="$ac_save_CFLAGS" | |
135 | ]) | |
136 | ||
137 | AS_IF([eval test x$]AS_TR_SH([cc_cv_attribute_$1])[ = xyes], | |
138 | [AC_DEFINE( | |
139 | AS_TR_CPP([SUPPORT_ATTRIBUTE_$1]), 1, | |
140 | [Define this if the compiler supports __attribute__(( ifelse([$2], , [$1], [$2]) ))] | |
141 | ) | |
142 | $4], | |
143 | [$5]) | |
144 | ]) | |
145 | ||
146 | AC_DEFUN([CC_ATTRIBUTE_CONSTRUCTOR], [ | |
147 | CC_CHECK_ATTRIBUTE( | |
148 | [constructor],, | |
149 | [void __attribute__((constructor)) ctor() { int a; }], | |
150 | [$1], [$2]) | |
151 | ]) | |
152 | ||
153 | AC_DEFUN([CC_ATTRIBUTE_FORMAT], [ | |
154 | CC_CHECK_ATTRIBUTE( | |
155 | [format], [format(printf, n, n)], | |
156 | [void __attribute__((format(printf, 1, 2))) printflike(const char *fmt, ...) { fmt = (void *)0; }], | |
157 | [$1], [$2]) | |
158 | ]) | |
159 | ||
160 | AC_DEFUN([CC_ATTRIBUTE_FORMAT_ARG], [ | |
161 | CC_CHECK_ATTRIBUTE( | |
162 | [format_arg], [format_arg(printf)], | |
163 | [char *__attribute__((format_arg(1))) gettextlike(const char *fmt) { fmt = (void *)0; }], | |
164 | [$1], [$2]) | |
165 | ]) | |
166 | ||
167 | AC_DEFUN([CC_ATTRIBUTE_VISIBILITY], [ | |
168 | CC_CHECK_ATTRIBUTE( | |
169 | [visibility_$1], [visibility("$1")], | |
170 | [void __attribute__((visibility("$1"))) $1_function() { }], | |
171 | [$2], [$3]) | |
172 | ]) | |
173 | ||
174 | AC_DEFUN([CC_ATTRIBUTE_NONNULL], [ | |
175 | CC_CHECK_ATTRIBUTE( | |
176 | [nonnull], [nonnull()], | |
177 | [void __attribute__((nonnull())) some_function(void *foo, void *bar) { foo = (void*)0; bar = (void*)0; }], | |
178 | [$1], [$2]) | |
179 | ]) | |
180 | ||
181 | AC_DEFUN([CC_ATTRIBUTE_UNUSED], [ | |
182 | CC_CHECK_ATTRIBUTE( | |
183 | [unused], , | |
184 | [void some_function(void *foo, __attribute__((unused)) void *bar);], | |
185 | [$1], [$2]) | |
186 | ]) | |
187 | ||
188 | AC_DEFUN([CC_ATTRIBUTE_SENTINEL], [ | |
189 | CC_CHECK_ATTRIBUTE( | |
190 | [sentinel], , | |
191 | [void some_function(void *foo, ...) __attribute__((sentinel));], | |
192 | [$1], [$2]) | |
193 | ]) | |
194 | ||
195 | AC_DEFUN([CC_ATTRIBUTE_DEPRECATED], [ | |
196 | CC_CHECK_ATTRIBUTE( | |
197 | [deprecated], , | |
198 | [void some_function(void *foo, ...) __attribute__((deprecated));], | |
199 | [$1], [$2]) | |
200 | ]) | |
201 | ||
202 | AC_DEFUN([CC_ATTRIBUTE_ALIAS], [ | |
203 | CC_CHECK_ATTRIBUTE( | |
204 | [alias], [weak, alias], | |
205 | [void other_function(void *foo) { } | |
206 | void some_function(void *foo) __attribute__((weak, alias("other_function")));], | |
207 | [$1], [$2]) | |
208 | ]) | |
209 | ||
210 | AC_DEFUN([CC_ATTRIBUTE_MALLOC], [ | |
211 | CC_CHECK_ATTRIBUTE( | |
212 | [malloc], , | |
213 | [void * __attribute__((malloc)) my_alloc(int n);], | |
214 | [$1], [$2]) | |
215 | ]) | |
216 | ||
217 | AC_DEFUN([CC_ATTRIBUTE_PACKED], [ | |
218 | CC_CHECK_ATTRIBUTE( | |
219 | [packed], , | |
220 | [struct astructure { char a; int b; long c; void *d; } __attribute__((packed));], | |
221 | [$1], [$2]) | |
222 | ]) | |
223 | ||
224 | AC_DEFUN([CC_ATTRIBUTE_CONST], [ | |
225 | CC_CHECK_ATTRIBUTE( | |
226 | [const], , | |
227 | [int __attribute__((const)) twopow(int n) { return 1 << n; } ], | |
228 | [$1], [$2]) | |
229 | ]) | |
230 | ||
231 | AC_DEFUN([CC_FLAG_VISIBILITY], [ | |
232 | AC_REQUIRE([CC_CHECK_WERROR]) | |
233 | AC_CACHE_CHECK([if $CC supports -fvisibility=hidden], | |
234 | [cc_cv_flag_visibility], | |
235 | [cc_flag_visibility_save_CFLAGS="$CFLAGS" | |
236 | CFLAGS="$CFLAGS $cc_cv_werror" | |
237 | CC_CHECK_CFLAGS_SILENT([-fvisibility=hidden], | |
e9c1ea9d JSJ |
238 | cc_cv_flag_visibility='yes', |
239 | cc_cv_flag_visibility='no') | |
47be870b LP |
240 | CFLAGS="$cc_flag_visibility_save_CFLAGS"]) |
241 | ||
242 | AS_IF([test "x$cc_cv_flag_visibility" = "xyes"], | |
243 | [AC_DEFINE([SUPPORT_FLAG_VISIBILITY], 1, | |
244 | [Define this if the compiler supports the -fvisibility flag]) | |
245 | $1], | |
246 | [$2]) | |
247 | ]) | |
248 | ||
249 | AC_DEFUN([CC_FUNC_EXPECT], [ | |
250 | AC_REQUIRE([CC_CHECK_WERROR]) | |
251 | AC_CACHE_CHECK([if compiler has __builtin_expect function], | |
252 | [cc_cv_func_expect], | |
253 | [ac_save_CFLAGS="$CFLAGS" | |
254 | CFLAGS="$CFLAGS $cc_cv_werror" | |
c1851444 | 255 | AC_COMPILE_IFELSE([AC_LANG_SOURCE( |
47be870b LP |
256 | [int some_function() { |
257 | int a = 3; | |
258 | return (int)__builtin_expect(a, 3); | |
e9c1ea9d | 259 | }])], |
47be870b LP |
260 | [cc_cv_func_expect=yes], |
261 | [cc_cv_func_expect=no]) | |
262 | CFLAGS="$ac_save_CFLAGS" | |
263 | ]) | |
264 | ||
265 | AS_IF([test "x$cc_cv_func_expect" = "xyes"], | |
266 | [AC_DEFINE([SUPPORT__BUILTIN_EXPECT], 1, | |
267 | [Define this if the compiler supports __builtin_expect() function]) | |
268 | $1], | |
269 | [$2]) | |
270 | ]) | |
271 | ||
272 | AC_DEFUN([CC_ATTRIBUTE_ALIGNED], [ | |
273 | AC_REQUIRE([CC_CHECK_WERROR]) | |
274 | AC_CACHE_CHECK([highest __attribute__ ((aligned ())) supported], | |
275 | [cc_cv_attribute_aligned], | |
276 | [ac_save_CFLAGS="$CFLAGS" | |
277 | CFLAGS="$CFLAGS $cc_cv_werror" | |
278 | for cc_attribute_align_try in 64 32 16 8 4 2; do | |
c1851444 | 279 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([ |
47be870b LP |
280 | int main() { |
281 | static char c __attribute__ ((aligned($cc_attribute_align_try))) = 0; | |
282 | return c; | |
c1851444 | 283 | }])], [cc_cv_attribute_aligned=$cc_attribute_align_try; break]) |
47be870b LP |
284 | done |
285 | CFLAGS="$ac_save_CFLAGS" | |
286 | ]) | |
287 | ||
288 | if test "x$cc_cv_attribute_aligned" != "x"; then | |
289 | AC_DEFINE_UNQUOTED([ATTRIBUTE_ALIGNED_MAX], [$cc_cv_attribute_aligned], | |
290 | [Define the highest alignment supported]) | |
291 | fi | |
292 | ]) |