summaryrefslogtreecommitdiff
path: root/m4/ac_attribute.m4
diff options
context:
space:
mode:
authorVincent Torri <vincent.torri@gmail.com>2011-04-24 17:14:34 +0000
committerVincent Torri <vincent.torri@gmail.com>2011-04-24 17:14:34 +0000
commit5067f72bcbf84b7f047676b2775b8889d0536632 (patch)
tree09e1c3c928337697385a6c4d5611af3776635cc2 /m4/ac_attribute.m4
parent9b5b9e48a67ed642a9222194345f195783c15b82 (diff)
Expedite: warnings--
SVN revision: 58872
Diffstat (limited to '')
-rw-r--r--m4/ac_attribute.m447
1 files changed, 47 insertions, 0 deletions
diff --git a/m4/ac_attribute.m4 b/m4/ac_attribute.m4
new file mode 100644
index 0000000..23479a9
--- /dev/null
+++ b/m4/ac_attribute.m4
@@ -0,0 +1,47 @@
1dnl Copyright (C) 2004-2008 Kim Woelders
2dnl Copyright (C) 2008 Vincent Torri <vtorri at univ-evry dot fr>
3dnl That code is public domain and can be freely used or copied.
4dnl Originally snatched from somewhere...
5
6dnl Macro for checking if the compiler supports __attribute__
7
8dnl Usage: AC_C___ATTRIBUTE__
9dnl call AC_DEFINE for HAVE___ATTRIBUTE__ and __UNUSED__
10dnl if the compiler supports __attribute__, HAVE___ATTRIBUTE__ is
11dnl defined to 1 and __UNUSED__ is defined to __attribute__((unused))
12dnl otherwise, HAVE___ATTRIBUTE__ is not defined and __UNUSED__ is
13dnl defined to nothing.
14
15AC_DEFUN([AC_C___ATTRIBUTE__],
16[
17
18AC_MSG_CHECKING([for __attribute__])
19
20AC_CACHE_VAL([ac_cv___attribute__],
21 [AC_TRY_COMPILE(
22 [
23#include <stdlib.h>
24
25int func(int x);
26int foo(int x __attribute__ ((unused)))
27{
28 exit(1);
29}
30 ],
31 [],
32 [ac_cv___attribute__="yes"],
33 [ac_cv___attribute__="no"]
34 )])
35
36AC_MSG_RESULT($ac_cv___attribute__)
37
38if test "x${ac_cv___attribute__}" = "xyes" ; then
39 AC_DEFINE([HAVE___ATTRIBUTE__], [1], [Define to 1 if your compiler has __attribute__])
40 AC_DEFINE([__UNUSED__], [__attribute__((unused))], [Macro declaring a function argument to be unused])
41 else
42 AC_DEFINE([__UNUSED__], [], [Macro declaring a function argument to be unused])
43fi
44
45])
46
47dnl End of ac_attribute.m4