https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67069
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> --- Don't use: "CFLAGS=-m64" "CXXFLAGS=-m64" "LDFLAGS=-m64" Instead set CC/CXX to include -m64 instead. Also you might need to default GCC to 64bit too.