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authorGustavo Sverzut Barbieri <barbieri@gmail.com>2012-06-17 17:04:17 +0000
committerGustavo Sverzut Barbieri <barbieri@gmail.com>2012-06-17 17:04:17 +0000
commit3fe325aad5ec4b63614185f644ca4b7b56cc6955 (patch)
tree1ae796b5ef5f81866c5878593140ba0b78bc52fe /m4
parent3ecf32e825e9a2fa81fbe4d281b7aaebd72ecf31 (diff)
reduce number of warnings with -Wall -Wextra.
there are still some shadow cases to be fixed and some parameters I've left unused since it seems like a bug in the API or code. SVN revision: 72302
Diffstat (limited to 'm4')
-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