On Thursday August 03 2017 17:11:56 Allan Sandfeld Jensen wrote:

> Didn't Qt only drop support for building on 10.9? I am pretty sure you should 
> be able to build on 10.10+ and deploy to 10.9 if you wish. Though I can see 

Nope, sadly that's not the case (and I doubt it was the intention either). You 
can still install Qt 5.9.1, once you figure out how to run the installer - last 
time I tried even the MaintenanceTool.app insisted on self-updating to a new 
version that crashed immediately because of missing symbols referenced from the 
cocoa QPA. I filed a QTBUG-61800 about that because it made it impossible to 
update even supported Qt versions on OS versions not supported by the latest Qt 
version.

The workaround trick I found was to force Qt to use the generic Unix QPA, which 
is good enough for basic installers but evidently not for a meaningful user 
experience.

On Thursday August 03 2017 15:14:52 Alexandru Croitor wrote:
> Iirc the minimum deployment version was bumped to 10.10 in qt 5.9. That was 
> also a change we had to do in webengine 

I'm expecting to run into >=10.10 requirements elsewhere in Qt 5.9 when I get 
around to building it, and I was already afraid that QWE would require more 
attention than I really care to give it (it's way too big to start hacking 
around in) ... But, "had to" as in "were obliged to" rather than "chose to"? 
Why - the BT code that already required using the 10.10 SDK maybe? All 
incompatibilities I've seen in the style and QPA were quite trivial to address 
(except for those requiring the "full" 10.10 SDK which 10.9 never got).

With some luck it will still be possible to build QWE 5.8 against Qt 5.9 
though, should there be too much to reintroduce (and I wouldn't mind either 
dropping BT support either in my build).

R.
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