I'm not sure I follow. The 6c and 6g compilers in the Go distribution are compiled with the local compiler, such as gcc on Linux and OS X. I don't believe it's possible they have Plan 9-specific features in their source. I can believe they would have problems compiling on Plan 9, but that's the inverse problem.
Once 6c is built, it is used to build the Go runtime, so the source and compiler should match perfectly. Plan 9 compiler issues should not be relevant. -rob
