https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79281
--- Comment #7 from Ian Lance Taylor <ian at airs dot com> --- It sounds like you have a patch for GCC 6. If you send it in I can apply it. The error you show must be from `make -j`, as compiling a file in libgfortran would not invoke go1. What is the actual failure?