http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49756
--- Comment #4 from Jason Merrill <jason at gcc dot gnu.org> 2011-07-18 15:22:11 UTC --- For this testcase, even 30MB isn't enough, but 40MiB is, so I think I'll round up to 64MB. I think it's probably best to raise the limit in both places to avoid confusion when invoking cc1plus directly.