Not a problem. I do wish I knew how to make PCH just work for your setup though. :) It is working correctly for me on both GCC 4.2 on Ubuntu and 4.4 on Fedora, so I wonder if perhaps it's a Gentoo thing? Only thing a quick Google check found was that it may be a kernel issue conflicting with PCH, but that was with much older versions of the kernel and GCC.
Either way, I don't think there's much I can do to get PCH to work for you, so closing this out. Thanks for the report, I'm sure the --disable-pch will come in handy for others in the future. :)