https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81878
--- Comment #33 from Tamar Christina <tnfchris at gcc dot gnu.org> --- > Do you know whether it would be possible to force the conversion by applying > some trick to GCC_LINK in ada/gcc-interface/Makefile.in? Yeah usually, cygpath -w would convert a path, seems we alias that to `fix_srcfile_path` in the gcc build system and use that often. I don't think that works in this case because the string contains more than just a path. But I think I may have a workaround, I'll give it a try tonight once I'm back at the Windows machine.