As discussed in the thread entitled "allow bootstrapping with older
compilers", this patch disallows __attribute__ for GCC < 3.4.
Applied as obvious, as you mentioned in the other thread.
Thanks.
commit 370a6a8ddc628924c1deedf752ea9fc9a058d5cc
Author: Aldy Hernandez <al...@redhat.com>
Date: Tue Dec 18 09:13:48 2012 -0600
PR other/54324
* ansidecl.h (ATTRIBUTE_UNUSED): Do not set __attribute__ for GCC
< 3.4.
diff --git a/include/ansidecl.h b/include/ansidecl.h
index 23d85bf..40f4a5f 100644
--- a/include/ansidecl.h
+++ b/include/ansidecl.h
@@ -279,8 +279,15 @@ So instead we use the macro below and test it against
specific values. */
# endif
#endif
+/* Similarly to ARG_UNUSED below. Prior to GCC 3.4, the C++ frontend
+ couldn't parse attributes placed after the identifier name, and now
+ the entire compiler is built with C++. */
#ifndef ATTRIBUTE_UNUSED
-#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+#if GCC_VERSION >= 3004
+# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+#else
+#define ATTRIBUTE_UNUSED
+#endif
#endif /* ATTRIBUTE_UNUSED */
/* Before GCC 3.4, the C++ frontend couldn't parse attributes placed after the
