Recognizing session type failed with Qt 5.12.8

[fancyfarmer]

Trying to link library with another project gives:

undefined reference to `QX11Info::isPlatformX11()'

I've noticed that in doc it shall be included in Qt 5.2: https://doc.qt.io/qt-5/qx11info.html#isPlatformX11

but it looks like it is not. It was included in following commit: https://github.com/qt/qtbase/commit/edceff30b4093e2bef6e80c7552edf595134f351 which precedes: v6.2.0-alpha1, v6.3.0-alpha1, v6.4.0-beta1

therefore check shall looks like:

#if QT_VERSION >= QT_VERSION_CHECK(6, 2, 0)
	return qGuiApp->nativeInterface<QNativeInterface::QX11Application>();
#else
	char *v = getenv("XDG_SESSION_TYPE");
	return (v == NULL || strcasecmp(v, "x11") == 0);
#endif

Similar issue can be recognized with:

undefined reference to `QX11Info::display()'

but I haven't take a look closely on it yet.

[Shatur]

but it looks like it is not. It was included in following commit:

It's because Qt removed it in 6.0 and re-introduced it in 6.2.

[Shatur]

Perhaps you built without QtExtras? Because I have these files:

    usr/
    usr/include/
    usr/include/qt/
    usr/include/qt/QtX11Extras/
    usr/include/qt/QtX11Extras/QX11Info
    usr/include/qt/QtX11Extras/QtX11Extras
    usr/include/qt/QtX11Extras/QtX11ExtrasDepends
    usr/include/qt/QtX11Extras/QtX11ExtrasVersion
    usr/include/qt/QtX11Extras/qtx11extrasglobal.h
    usr/include/qt/QtX11Extras/qtx11extrasversion.h
    usr/include/qt/QtX11Extras/qx11info_x11.h
    usr/lib/
    usr/lib/cmake/
    usr/lib/cmake/Qt5X11Extras/
    usr/lib/cmake/Qt5X11Extras/Qt5X11ExtrasConfig.cmake
    usr/lib/cmake/Qt5X11Extras/Qt5X11ExtrasConfigVersion.cmake
    usr/lib/libQt5X11Extras.prl
    usr/lib/libQt5X11Extras.so
    usr/lib/libQt5X11Extras.so.5
    usr/lib/libQt5X11Extras.so.5.15
    usr/lib/libQt5X11Extras.so.5.15.5
    usr/lib/pkgconfig/
    usr/lib/pkgconfig/Qt5X11Extras.pc
    usr/lib/qt/
    usr/lib/qt/mkspecs/
    usr/lib/qt/mkspecs/modules/
    usr/lib/qt/mkspecs/modules/qt_lib_x11extras.pri
    usr/lib/qt/mkspecs/modules/qt_lib_x11extras_private.pri
    usr/share/
    usr/share/licenses/
    usr/share/licenses/qt5-x11extras

[Shatur]

So looks like you have it too?

[Shatur]

That's right together with dev headers. It should just work, but mu point is that there is no method called isPlatformX11 in QtX11extrass lib itself until 6.2

That's strange. Because I use isPlatformX11() with Qt5 on my machine for several years for sure. I believe that something wrong with linkage on your machine.

[Shatur]

So QHotkey should link with X11Extras for Qt5?

[Shatur]

No, if a library depends on something - CMake should propagate it dependency.

[Shatur]

I believe we link it here:

https://github.com/Skycoder42/QHotkey/blob/34777f2e91b72cdc62a415975cc3ec53475ed022/CMakeLists.txt#L62-L66

But it doesn't work for you?

[Shatur]

links to target "Qt5::X11Extras" but the target was not

So CMake cannot find Qt5::X11Extras on your system. Unfortunately, something wrong with your system configuration.

[Shatur]

The point is unless I add: find_package(Qt5X11Extras REQUIRED) to my cmake I am getting the error like at the beginning.

Can't help you here. It should just work.