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List:       macports-dev
Subject:    Re: Where to draw the line between Qt 4 and 5
From:       "Michael Dickens" <michaelld () macports ! org>
Date:       2019-02-28 15:42:24
Message-ID: 96bdd6ba-11b4-4bc5-b5f2-d5fcc3c37d82 () www ! fastmail ! com
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CMake has the same dilemma.

I'm using Qt4 on macOS 10.14 latest & see no issues on a retina display excepting \
that the "retina" concept isn't supported. IIRC we've added tweaks to allow the user \
to select the default rendering engine, and that took care of all of the issues I've \
heard of or seen (or, maybe it was a PR that never got finished? I no longer recall \
...). If there is a scaling issue (beyond the lack of support for the "retina" \
concept) then I'd love to hear what it is. I'm amazed that Qt4 still works as well as \
it does on 10.14, TBH!

Related about Qt5: I have issues getting it installed even on OSX 10.11 when using \
MacPorts! I believe this is because of MP programming and not Qt5 stuff, but whatever \
IDK. I've tried "update" and direct "install" with no success; I've yet to try \
"deactivate" then "install", but that's next up the current updates finish.

Also related: I don't actively use Qt5 yet like I used to use Qt4, so maybe someone \
else knows the answer here: does each successive version of Qt5 have both API and ABI \
changes that make them backward-incompatible with prior versions? I'm guessing the \
answer is "yes". If so, then is the "feature set" for a given port relevant for \
selecting which version of Qt5 will work with it? I -hope- the answer here is "maybe \
but not generally" otherwise how could we make sure the proper version of Qt5 is \
installed for all the various ports requiring their different feature sets?

I really don't know what a good cutoff is between Qt4 and Qt5 for the default if both \
can work. If I had to guess, I'd say Y == 10.9 and X == 10.11 right now ... but maybe \
expand those to 10.8 and 10.12 maximally. Just a guess based on my recent Qt5 \
updating / installing experiences ...

Hope this is useful! - MLD

On Thu, Feb 28, 2019, at 9:59 AM, Mojca Miklavec wrote:
> Hi,
> 
> I would like to update Mercurial & TortoiseHG, but I don't know on
> which OS Qt 5 may be declared as default one. Note that both Qt 4 and
> 5 work fine (see below), so it doesn't really matter which one is used
> and I wouldn't want to break old OSes just because of a stupid
> hardcoded requirement of Qt 5.
> 
> I don't want to make Qt 4 default on newer OSes either because it
> doesn't work correctly on Retina display (many buggy issues with
> scaling), but that's the last thing to worry about on 10.5.
> 
> I thought that maybe we should make Qt 5 default on darwin >= X, Qt 4
> default on darwin < Y and potentially offer variants on Y <= darwin <
> X and defaulting to Qt 4 (where we may set X = Y, making this subset
> empty).
> 
> So: where should I draw the line? What should X/Y be?
> 
> The relevant PR is here:
> https://github.com/macports/macports-ports/pull/3664
> 
> Thank you,
> Mojca
> 


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