On Sun, Jun 11, 2017 at 11:37 PM, Xi Ruoyao <ryxi@stu.xidian.edu.cn> wrote: > Oh no Toby... I didn't mean COLLECT_GCC_OPTIONS. Its -march > is same as your input (or defaulted). Thankyou. I see it now! I'll investigate on my platforms (and not post here, since I seem to be spamming quite a bit just right now on this topic!)