"Zidenberg, Tsahi" <tsa...@amazon.com> writes:
> Outline-atomics is a gcc compilation flag that adds runtime detection of
> weather or not the cpu supports atomic instructions. CPUs that don't support
> atomic instructions will use the old load-exclusive/store-exclusive
> instructions. If a different compilation flag defined an architecture that
> unconditionally supports atomic instructions (e.g. -march=armv8.2), the
> outline-atomic flag will have no effect.
I wonder what version of gcc you intend this for. AFAICS, older
gcc versions lack this flag at all, while newer ones have it on
by default. Docs I can find on the net suggest that it would only
help to supply the flag when using gcc 10.0.x. Is there a sufficient
population of production systems using such gcc releases to make it
worth expending configure cycles on? (That's sort of a trick question,
because the GCC docs make it look like 10.0.x was never considered
to be production ready.)
regards, tom lane
