[llvm-dev] Qualifiers not being discarded for atomic types while compiling with clang

[Joerg Sonnenberger via llvm-dev]

On Fri, Jun 09, 2017 at 12:51:17PM +0530, Puneetha K via llvm-dev wrote:
> Similarly, while trying to compile this
> 
> extern int i;
> extern int _Atomic const ci;
> extern __typeof(ci) i;
> 
> Clang gives error:
> 
>           "Redeclaration of 'i' with a different type: 'typeof (ci)' (aka
> 'typeof _Atomic(int)') vs 'int' "
> 
> while gcc compiles it successfully.
> 
> This seems to be because clang probably considers Atomic int differently
> than int while gcc disregards these.

This one is entirely legit. "_Atomic int" and "int" are very different
types, they may even have different alignment requirements.

Joerg