Call for compiler help/advice: atomic builtins for v3

[Paolo Carlini]

Richard Guenther wrote:
> We could just provide fallback libcalls in libgcc
All in all, I think this is really the best solution. For 4.2 Sparc will 
also have the builtins available and even if we want that the libgcc 
code is equivalent to what is currently available in 
libstdc++-v3/config/cpu, that is, not just locks when possible, the 
amount of code added to libgcc would be very limited. Then, during the 
transition phase we could help ourselves with some macro tricks, but 
only temporarily.

Paolo.