asm volatile

[Jim Blandy]

> scwm-constraints.hpp:71: warning: volatile qualifier ignored on asm
> 
> I did not get such warnings from egcs-1.01 thru 1.03a, so something must
> have changed.  I'm not sure if this is a bug in egcs, or if it's a
> change in its guarantees.  If egcs is not buggy on this point, then the
> SCM_FENCE may need to be expanded away to nothing to avoid the warning
> and we need to be sure that something else is preventing code motion as
> SCM_FENCE is intended to do.

Anthony Green put in that stuff, so I've asked him if he knows what's
changed in the compiler...