[v3] atomics

[Mark Mitchell]

Benjamin Kosnik wrote:

> It sounds like it's not hard to do implement the full set. That's
> certainly my preference.

I think that's reasonable, but ...

> Do you have any idea as to how many backends this impacts? 

... since David Daney wrote ...

> A casual grep of arm, sh, and m68k  indicates that they are probably missing _sync*, there may be others too.

... I think that that this patch should be backed out or disabled until 
all of the primary and secondary platforms have the necessary builtins 
or until the library can automatically turn off the new functionality on 
platforms that don't support it.

Thanks,

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
(650) 331-3385 x713