http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59852
--- Comment #1 from Josh Triplett <josh at joshtriplett dot org> --- Note in particular the bit about typedefs. Two identical declarations both using __attribute__((bitwise)) create two variables with different types, but two declarations both usin the same typedef declared with __attribute__((bitwise)) create two variables with the same type. In code: __attribute__((bitwise)) unsigned a, b; __attribute__((bitwise)) unsigned c, d; typedef __attribute__((bitwise)) unsigned foo_t; foo_t e, f; foo_t g, h; a and b have the same type. c and d have the same type. e, f, g, and h have the same type.
