https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83206
--- Comment #19 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
-m{cpu,tune,arch}=native are hosted-only flags that mean look-up the
architecture on the machine I'm running on now. They are not supported at all
on cross compilers. This is translated by the driver into the real
-m{cpu,tune,arch} flag that gets passed to the compiler proper, which is why
you see it changed by the help information.
-mfpu=auto means use the floating-point unit implied by -mcpu/-march flags.
This works even if on a cross compiler. -mfpu=auto != -mfpu=native. There
never has been a -mfpu=native option and now we have -mfpu=auto we don't need
one. -mfpu=auto is not translated by the driver; it's used in the compiler
proper to control where the selected FPU information is looked up (directly or
from the architecture specification).
