[Development] SJLJ vs DW2 (Was: Re: Qt 5.2.0 - Beta Release Testing)

[Koehne Kai]

> -----Original Message-----
> From: development-bounces+kai.koehne=digia.com at qt-project.org
> [mailto:development-bounces+kai.koehne=digia.com at qt-project.org] On
> Behalf Of Markus Goetz
> Sent: Wednesday, February 12, 2014 11:45 AM
> To: development at qt-project.org
> Subject: [Development] SJLJ vs DW2 (Was: Re: Qt 5.2.0 - Beta Release
> Testing)
> 
> Hi Kai,
> 
> On 25.10.13 10:05, Koehne Kai wrote:
> > I think the link is outdated. MinGW-builds nowadays supported both dw2
> and sjlj exception handling for 32 bit since ages, see e.g.
> >
> > http://mingw-w64.sourceforge.net/download.php#mingw-builds
> >
> > (Note that the Mingw-w64 and MinGW-builds projects joined forces just
> recently, so the mingw-builds binaries are the 'officially endorsed' ones).
> >
> > Anyhow, Qt itself doesn't really care about SJLJ vs dw2: It compiles just fine
> with both versions. It's just that, since 5.1, we're building the 'official'
> packages with a dw2 toolchain.
> >
> Are there any plans to also provide official SJLJ packages for mingw-w64 ?

No, there aren't any plans AFAIK. If we'll add a new configuration it'll most likely be a 64 bit one, and we really can't stretch the number of Windows binary packages much further.

> Right now people that don't want to build themselves have to go 3rd
> party sites like
> http://sourceforge.net/projects/qtx64/files/qt-x64/5.2.1/mingw-4.8/

I don't know about this project. However, the mingw-builds folks are also providing Qt packages, which I can only recommend:

http://sourceforge.net/projects/mingwbuilds/files/external-binary-packages

I'm all for featuring these a bit more prominently within Qt ...

> (Yes, SJLJ is inferior to SEH, but sometimes you don't control the whole
> stack/hell of DLLs and just need to use SJLJ)

Understood. We just made the choice for DW2 because SJLJ was a lot slower, even for people who don't use exceptions.

Regards

Kai