[cfe-dev] __atomic_ builtins for 64-bit types in 32-bit mode

[David Chisnall]

On 31 Jan 2013, at 10:49, Kostya Serebryany wrote:

> Any other suggestion w.r.t __atomic_ builtins for 64-bit types in 32-bit mode? 

Beyond 'don't use them'?  The gcc-compatible atomic builtins are implemented solely to support the poor design choices in libstdc++.  They can not be used safely with C11 code because they do not require _Atomic-qualified types and so do not respect the stricter alignment and padding requirements that these types may require.

David