https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69471
--- Comment #2 from wavexx at thregr dot org --- On 25/01/16 18:38, redi at gcc dot gnu.org wrote: > Why would either you or the makefile add something like -march=opteron on a > haswell host? > > Surely the makefile should only add option that make sense, and you should > only > override them with options that make sense. I generally use -march=native for most of my in-house projects. However, on very few binaries part of a larger project I actually target some older ISAs so I simply append -march=[x] as an exception with the usual CFLAGS += .... I could also (as I'm currently doing) splice -march out of CFLAGS and/or override CFLAGS in the required rules, so it's not a huge deal (as outlined in the original discussion), but even if documented, I would find the current behavior unexpected. I would have expected -march=native to simply expand to -march=haswell so that I could override it normally as I do for almost everything else.
