Add CMake configuration option to select Qt5 or Qt6

[Flowdalic]

Gentoo downstream here.

It would be great if there was a CMake configuration option to select Qt5 or Qt6 (probably defaulting to autoselect). This makes it easier to reliable package qtrvsim [1]. Right now, qtrvsim basically establishes an automagic dependency on Qt, which is problematic [2].

1: https://bugs.gentoo.org/933594 2: https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Automagic_dependencies

[jdupak]

Hi Florian, sure that should be very easy and I wanted to do it for development anyway.

I will get to it on Friday or during weekend.

It's there some established option name for this?

On Tue, 9 Jul 2024, at 08:19, Florian Schmaus wrote:

Gentoo upstream here.

It would be great if there was a CMake configuration option to select Qt5 or Qt6 (probably defaulting to autoselect). This makes it easier to reliable package qtrvsim [1]. Right now, qtrvsim basically establishes an automagic dependency on Qt, which is problematic [2].

1: https://bugs.gentoo.org/933594 2: https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Automagic_dependencies

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[Flowdalic]

I see

• QT_VERSION_MAJOR
• QT_MAJOR_VERSION
• QTFIXEDVERSION

being used in Gentoo. I would probably go with the first one, but no strong opinion. That said, options should be

• 5
• 6
• auto

with auto or 6 being the default.