[PATCH] RX: Add rx-*-linux target

[Oleg Endo]

On Sun, 2019-06-02 at 12:37 -0500, Segher Boessenkool wrote:
> 
> This is -m64bit-doubles/-m32bit-doubles, and t-rx already multilibs
> that?

Yes, it does.

> And the default is 32-bit.  So why does rx-linux need something
> different?
> You could make a point for wanting 64-bit doubles as default, even;
> disabling it completely does not seem like a good plan.
> 

On RX, "default to 32-bit" means DF=SF, always.  I.e. DF is disabled
for good.  Usually I built RX stuff always with -m64bit-doubles because
of that.  It should be actually the default and -m32bit-doubles should
be some kind of "optimization" switch.  So in my optinion, -m64bit-
doubles should be the default for a linux target, to allow having
actual doubles, and not just floats.

Cheers,
Oleg