https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67968
--- Comment #7 from Ian Lance Taylor <ian at airs dot com> --- Dominik: Chris has committed a number of recent fixes for gccgo compiler crashes. Are you testing with current mainline or with the 5.2.1 release that gong_su is using? Or is the problem that you don't have the imported packages? If that is the problem, then I wouldn't worry about shrinking the number or size of the input files. The only thing that matters is reducing the number of imports. Or, it's likely to be easier to just tar up the import files. Once this kind of problem can be reproduced, it's usually easy to fix.
