labath added a comment.

In https://reviews.llvm.org/D30984#711806, @EricWF wrote:

> I don't see anything wrong with this, but I only know libc++ and not LLDB.


I'm not sure why you ended up here. I think you have too wide phabricator 
filter somewhere. :)

> 
> 
>>   libc++'s atomic does not play well with gcc on linux
> 
> It should... Can you elaborate on this issue? I suspect this may be a libc++ 
> bug.

It checks for `#if __has_feature(cxx_atomic)` and then aborts if it is not 
found. However, this is in the system libc++ on ubuntu (lldb uses system libc++ 
for reasons which are too long to go into right now), which is quite old. I 
don't see a similar check in the current trunk, so it's possible that has been 
fixed since then.


https://reviews.llvm.org/D30984



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