Processor-specific code

[François-Xavier Coudert]

Hi all,

I'm working on implementation of the different FPU options for libgfortran, 
the runtime library for gfortran (e.g., on which floating-point exception do 
we want a SIGFPE to be raised, what rounding-mode does the user want, etc.).

There is nothing in standard C (or even POSIX) to do that, and we'll have to 
include some processor-specific code. How does the build system allow that? 
Can we have a system of MACRO defined depending on the target processor 
(something like TARGET_FPU_IS_PPC)?

PS: If I said something stupid or offended your sense of riguor, please 
don't be too harsh on someone new to this kind of problem.

FX