Take the following testcase:
#include <altivec.h>
#define xprint_vec(type) void x##type(vector type v) { }
xprint_vec(float);
This used to work in 4.3 and before but does not currently. The problem here
was introduced when the context sensitive keyword support was added.
--
Summary: [4.4 Regression] vector context sensitive keyword vs
macros
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: target
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: powerpc-linux
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36904