Ldc vs dmd vs gdc

[Rikki Cattermole via Digitalmars-d]

On Monday, 15 December 2014 at 08:25:16 UTC, Rikki Cattermole 
wrote:
> I found a little interesting difference between ldc, dmd and 
> gdc today.
> Summarized in ldc it does not allow you to have multiple extern 
> c'd function prototypes with different parameters but same 
> mangling aka name.
>
> In dmd and gdc it compiles fine. I believe this is actually 
> wrong.
> As c abi does not support overloading of functions, shouldn't 
> the compilers at the very least report a warning of this?
>
> [0] 
> https://github.com/nomad-software/x11/issues/6#issuecomment-66959937
> [1] 
> https://github.com/nomad-software/x11/blob/160f5109cb9f09ab69f9a16c685c5a6b39179db6/source/x11/Xlib.d#L1534
> [2] 
> https://github.com/nomad-software/x11/blob/160f5109cb9f09ab69f9a16c685c5a6b39179db6/source/x11/Xlib.d#L1554

Could really use an answer to this.
Another person discovered this in the wild.
http://forum.dlang.org/post/gpfxidqvrseuhxpnckzu@forum.dlang.org