https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68029
--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> --- (In reply to Jiří Engelthaler from comment #3) > (In reply to Manuel López-Ibáñez from comment #2) > > What does -### show for the call to cc1 ? My commit r228094 to opts-common.c > > should have fixed this. > > $ gcc -fdiagnostics-color=never a.c -### > cc1.exe -quiet -D__USES_INITFINI__ a.c -quiet -dumpbase a.c -auxbase a -o > /tmp/cclEySGP.s To be honest, I don't have any clue why this is happening. This output seems to happen before calling any code in opts-common.c as a result of the specs. But why the specs will be touching -fdiagnostics-color=? I don't know much about how the specs work. If reverting the patch fixes the problem, please go ahead and just reopen the bug fixed by it.