Hello,
GCC 4.7.0 was just released, and I have been able to build it - with a
few caveats - for OpenBSD 4.8 x86_64. I sent a detailed message to the
gcc mailing list describing what I needed to do:
http://gcc.gnu.org/ml/gcc/2012-03/msg00368.html
I hope that this information will be useful for the purpose of making
gcc 4.7.0 available in the ports tree. My hacks would not be
appropriate for a "real" release, but might save time for someone else
who knows enough to do it more correctly than I do.
--
Kyle Markley