https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43979
--- Comment #2 from Hendrik de Wilde-Geisler <knurt at geislersoftware dot de> --- (In reply to Andrew Pinski from comment #1) > This has been working for me and others. I suspect you are building where > srcdir == objdir which is not really supported. Thanks. I'm quite sure I did not build in srcdir, but I no longer build GCC so resolved is OK.