[Bug driver/83206] -mfpu=auto does not work on ARM (armv7l-unknown-linux-gnueabihf)

rearnsha at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Mon Dec 11 10:56:00 GMT 2017


--- 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).

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