[Bug target/65697] __atomic memory barriers not strong enough for __sync builtins

[mwahab at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65697

--- Comment #62 from mwahab at gcc dot gnu.org ---
(In reply to Ramana Radhakrishnan from comment #61)
> Well, confirmed at least. And at the minute fixed on trunk - not sure if we
> are asking for backports for this ?

Marcus has asked for this to be backported to 5.1 and maybe 4.9. I'm looking at
it.