[Releasing] Updating the mingw version for 5.4 (CI/packaging)

[Koehne Kai]

> -----Original Message-----
> From: releasing-bounces+kai.koehne=digia.com at qt-project.org
> [mailto:releasing-bounces+kai.koehne=digia.com at qt-project.org] On Behalf
> Of Massimo Belgrano
> Sent: Saturday, September 20, 2014 11:13 PM
> To: releasing at qt-project.org
> Subject: Re: [Releasing] Updating the mingw version for 5.4 (CI/packaging)
> 
> Why not use SEH exception?

Because it's not supported by gcc for 32 bit. We've the choice between dwarf and sjlj. We first tried SJLJ (in 5.0.x releases) because it also works with native Windows stack frames in the exception unwind stack, but that was carrying such a big overhead that we switched to dwarf in later releases.

Regards

Kai