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List:       kde-frameworks-devel
Subject:    detect the Qt version KF5 frameworks were build against in CMake?
From:       René J.V. Bertin <rjvbertin () gmail ! com>
Date:       2019-08-28 17:19:21
Message-ID: 5691a269-8dd2-bed7-fceb-e64b68c8b382 () gmail ! com
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Hi,

Some KF5 framework libraries pull in Qt5 headers and/or libraries via their CMake \
modules, right?

Take the somewhat unusual situation where you have your KF5 frameworks built against, \
say, Qt 5.9 from the system and you want to test an application against a different, \
newer Qt build installed with Qt's installer. Qt guarantees this should work as long \
as you don't use private APIs. Those aforementioned KF5 frameworks will pull in \
"their" Qt5 headers (e.g. for Qt5Network in the project I'm tinkering with), meaning \
that QT_VERSION #ifdefs can behave in an unexpected way.

Is there a way to detect this kind of situation at the cmake level, i.e. is there \
some constant that holds the Qt value the frameworks were built against?

Thanks,
R.


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