[Development] Why we need two `Qt*.dll` copies on Windows?

[Koehne Kai]

> -----Original Message-----
> Subject: [Development] Why we need two `Qt*.dll` copies on Windows?
> 
> Does some one notice there exists two QtDLLs on Windows, the one in
> bin\Qt*.dll, and the other placed `lib\Qt*.dll`, WHY?

To cite a commit by Ossi: " the dlls being in lib/ is kind of an accident (a side effect of how qmake builds them" (commit d8406d0e09c5bfa549f27). Anyway, the binary installers from 5.0.2 onwards ship the dll's only in bin. 

Regards

Kai