Am Samstag, 9. Juli 2016 um 21:26:51, schrieb Enrico Forestieri <for...@lyx.org> > On Sat, Jul 09, 2016 at 09:02:09PM +0200, Enrico Forestieri wrote: > > > > Then, looking at development/cmake/ConfigureChecks.cmake, it seems to > > me that QT_USES_X11 is correctly set for Qt4, because the QX11Info header > > is always installed on all platforms and compilation fails if X11 is > > not the correct backend. This is not true for Qt5, as QtX11Extras/QX11Info > > is only present if the Qt5X11Extras module is installed, and not otherwise. > > So, compilation of the code snippet at lines 212-216 may fail even if X11 > > is the backend, so that QT_USES_X11 may not be correctly guessed with Qt5. > > Sorry, I now see that it is guarded by "if (Qt5X11Extras_FOUND)". > In this case, the last sentence above should read: > So, compilation of the code snippet at lines 212-216 is not attempted > even if X11 is the backend, so that QT_USES_X11 may not be guessed with Qt5. > > A more safe approach is based on looking at QtCore/qconfig.h, which > directly tells you what is the default backend. Indeed it contains > #define QT_QPA_DEFAULT_PLATFORM_NAME "xcb" > if X11 is the backend. >
At the time I introduced the check, the need for knowing about X11 was testing
with xvkbd.
I will try to use this define.
Kornel
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