On 9 August 2013 17:59, Joe Buck wrote: > The i386 architecture lacks atomic compare instructions, to the point > where libstdc++ can't be built with that architecture (correct and > efficient atomic operations are vital important for libstdc++, andon i386 > it can't be done).
I think libstdc++ can be built for i386, but uses a global spinlock for all atomic ops, instead of actual atomic instructions. See libstdc++-v3/include/ext/atomicity.h and libstdc++-v3/config/cpu/i386/atomicity.h I look forward to the day when (not if) GCC drops support for i386 :-)
