[Development] Qt 6 co-installability with Qt 5

[Thiago Macieira]

On Saturday, 31 October 2020 17:23:54 PST Kevin Kofler via Development wrote:
> Third-party build systems need to call moc and uic directly, and it makes
> life much easier for them if they do not have to first query qmake-qt6,
> cmake, pkg-config or whatever to know where to find the correct version of
> those binaries, but can just directly invoke moc-qt6 and get what they need.

I agree with the sentiment, but I think it's totally reasonable to query pkg-
config if we think it's the way to go.

$ qt installed                                                             
Using Qt version: installed

$ file `pkg-config --variable=host_bins $QTLIBDIR/pkgconfig/Qt5Core.pc`/moc
/home/tjmaciei/obj/qt/installed/bin/moc: ELF 64-bit LSB executable, x86-64, 
version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-
x86-64.so.2, BuildID[sha1]=38614abe6965e5ddd6c2760ab30e89f9939f2a43, for GNU/
Linux 3.2.0, stripped

$ qt 5 
Using Qt version: 5

$ file `pkg-config --variable=host_bins $QTLIBDIR/pkgconfig/Qt5Core.pc`/moc
/home/tjmaciei/obj/qt/qt5/qtbase/bin/moc: ELF 64-bit LSB executable, x86-64, 
version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-
x86-64.so.2, BuildID[sha1]=5d99e80a10db2b867987482a86b23390892da194, for GNU/
Linux 3.2.0, with debug_info, not stripped

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel DPG Cloud Engineering