http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49579
--- Comment #4 from Olaf van der Spek <olafvdspek at gmail dot com> 2011-06-29 19:59:57 UTC --- Aren't 1 and 2 the same thing? I'm not sure what 3 is, but it's about a Hello World example using AM and PCH.