https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61315
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- The problem is clang is saying it understands GNU C but it does not fully; if instead they would define __GNUC__ only if -fheinous-gnu-extensions is used you would not have seen this bug in first place. So again this is a bug in clang and we should not change the default options for a broken compiler.