[PATCH] support: user more portable atomic wrappers

[Vineet Gupta]

On 9/9/20 3:19 AM, Florian Weimer via Libc-alpha wrote:
> * Vineet Gupta via Libc-alpha:
> 
>> This came up in a nascent arc64 port, lacking gcc atomics for now
> 
> Can you please change the GCC port to provide atomics instead?

Sure, they are added now.

> It does not make sense to maintain those atomics in many projects
> separately.

I agree that gcc atomics should be baseline. I would still propose to carry this
patch as it makes code less verbose if nothing else and the wrappers are part of
glibc already.