1 files changed, 47 insertions, 0 deletions

diff --git a/libraries/embryo/m4/ac_attribute.m4 b/libraries/embryo/m4/ac_attribute.m4
new file mode 100644
index 0000000..23479a9
--- /dev/null
+++ b/libraries/embryo/m4/ac_attribute.m4
@@ -0,0 +1,47 @@
+dnl Copyright (C) 2004-2008 Kim Woelders
+dnl Copyright (C) 2008 Vincent Torri <vtorri at univ-evry dot fr>
+dnl That code is public domain and can be freely used or copied.
+dnl Originally snatched from somewhere...
+
+dnl Macro for checking if the compiler supports __attribute__
+
+dnl Usage: AC_C___ATTRIBUTE__
+dnl call AC_DEFINE for HAVE___ATTRIBUTE__ and __UNUSED__
+dnl if the compiler supports __attribute__, HAVE___ATTRIBUTE__ is
+dnl defined to 1 and __UNUSED__ is defined to __attribute__((unused))
+dnl otherwise, HAVE___ATTRIBUTE__ is not defined and __UNUSED__ is
+dnl defined to nothing.
+
+AC_DEFUN([AC_C___ATTRIBUTE__],
+[
+
+AC_MSG_CHECKING([for __attribute__])
+
+AC_CACHE_VAL([ac_cv___attribute__],
+   [AC_TRY_COMPILE(
+       [
+#include <stdlib.h>
+
+int func(int x);
+int foo(int x __attribute__ ((unused)))
+{
+   exit(1);
+}
+       ],
+       [],
+       [ac_cv___attribute__="yes"],
+       [ac_cv___attribute__="no"]
+    )])
+
+AC_MSG_RESULT($ac_cv___attribute__)
+
+if test "x${ac_cv___attribute__}" = "xyes" ; then
+   AC_DEFINE([HAVE___ATTRIBUTE__], [1], [Define to 1 if your compiler has __attribute__])
+   AC_DEFINE([__UNUSED__], [__attribute__((unused))], [Macro declaring a function argument to be unused])
+  else
+    AC_DEFINE([__UNUSED__], [], [Macro declaring a function argument to be unused])
+fi
+
+])
+
+dnl End of ac_attribute.m4