[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 Harri Porten
> Sent: Thursday, September 18, 2014 4:07 PM
> To: releasing at qt-project.org
> Subject: Re: [Releasing] Updating the mingw version for 5.4 (CI/packaging)
> 
> Hello Kai,
> 
> On Thu, 18 Sep 2014, Koehne Kai wrote:
> 
> > I'd like to suggest updating the MinGW version we build binaries for
> > once more for Qt 5.4. The suggested toolchain would be mingw-builds
> > i686-4.9.1-release-posix-dwarf-rt_v3-rev1 [1].
> 
> Could you explain how this would affect ABI compatibility? I.e. can binaries
> compiled with the new compiler link against libraries build with i686-4.8.2-
> release-posix-dwarf-rt_v3-rev3?

designer, assistant, qmlscene ... compiled with 4.9.1 run just fine with the same Qt version compiled with 4.8.2, and vice versa. Anyhow, I don't think the upstream project (mingw-builds) really says anything about binary compatibility, so I wouldn't entirely rely on it :)

Regards

Kai


> I see that at least the threading and exception models are the same. Which
> would be nice.

Well, even better would be if we'd have native/SEH exception handling by now for 32 bit, now that the 'Borland patent' has apparently run out. Let's hope that this materializes, at one point ...