Call for compiler help/advice: atomic builtins for v3

[Paolo Carlini]

Hi Ian,

>I can see that there is a troubling case that code may be compiled for
>i386 and then run on a multi-processing system using newer processors.
>That is something which we would have to detect at run time, in start
>up code or the first time the builtins are invoked.
>  
>
Earlier in this thread, Mark figured out a very nice solution for this
problem: a target-aware libgcc. Apparently glibc is already using a
similar approach.

Paolo.