Processor-specific code

[François-Xavier Coudert]

> Can you explain in a little more detail what you are trying
> to accomplish?  gfortran can already pass the -m and -f
> options suppported by gcc.  For example, -ffast-math works.

Runtime library reads GFORTRAN_FPU_* environment variables if they exist, 
and set up the FPU accordingly.

> One other thing to keep in mind, at some point we'll 
> want to implement TR 15880.  Are there any potential
> conflicts?

No, since reading GFORTRAN_FPU_* variables changes the FPU mode when the 
library is loaded, while TR 15580 commands will be ran afterwards (during 
execution).

Of course, when the code for GFORTRAN_FPU_* is written (which is much easier 
than full TR 15580 support), we can use it for TR 15580.

FX