[Bug driver/69471] "-march=native" unintentionally breaks further -march/-mtune flags

[wavexx at thregr dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69471

--- Comment #17 from wavexx at thregr dot org ---
I wish this would be given a nudge, considering the patch. This has been pushed
to new releases since 2016 :(

It's not a show-stopper, but it does cause unexpected behavior which is quite
hard to track down and to fix as well in build systems unless you're accounting
for it from the start.