https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115978
--- Comment #4 from Hongtao Liu <liuhongt at gcc dot gnu.org> --- To clarify, the question originally came from whether or not to report error for -m32,-march=native, and then LLVM folks said it's diffcult for LLVM not issuing error for -march=native -m32, but issuing error for explicit -mapxf -m32. So they want to just not issue error at all, and then comipler silently disables the 64-bit only features(plus adding documents to mention -m32 will disable those features).
