Add several GCC attributes that should only be associated with functions: leaf, artificial, and warn_unused_result.  These are all heavily used in <stdio.h> under Fedora 17 (glibc 2.15) when optimization is turned on. Without this fix, these attributes tend to be incorrectly associated with functions' return types, which in turn leads to GCC warnings about incorrect attribute use.
Add several GCC attributes that should only be associated with functions:
leaf, artificial, and warn_unused_result.  These are all heavily used in
<stdio.h> under Fedora 17 (glibc 2.15) when optimization is turned on.
Without this fix, these attributes tend to be incorrectly associated with
functions' return types, which in turn leads to GCC warnings about
incorrect attribute use.

samuelhavron/obliv-c,samuelhavron/obliv-c,samuelhavron/obliv-c,samuelhavron/obliv-c