building qt from sources - CMake Error at cmake/FindQt5.cmake

JonB

@GALAV
Are you attempting to build Qt5 or Qt6?

GALAV

@JonB
QT6, but it seems like it requires QT5 for doing so, therefore the prefix_path to qt5 i guess

JonB

@GALAV
Then (not that I have done this but) presumably you should not have passed C:\Qt5.15.2\... to cmake. You should not have/use anything Qt5.x to build Qt6.x.

GALAV

@JonB
It makes sense what you are saying but this is the output with C:\Qt*6.3.1*...

therefore im baffled and i guess the path to 5.15.2 is needed

kkoehne

First of all it seems like you're not trying to build Qt from sources, but Qt Creator.

Try to change the CMAKE_PREFIX_PATH you set to C:\Qt\6.3.1\msvc2019_64 (leaving out the lib\cmake\Qt6part).

JonB

@kkoehne
~~I think OP has done that in latest post.~~ OIC, without the extra stuff after that.

@GALAV
Again, only a guess, but which cmake are you using from the command line?
[Just listen to @kkoehne, he will sort you out!]

GALAV

@JonB cmake version 3.24.0-rc3
@kkoehne - same output (tried both versions)

kkoehne

Please delete the CMakeCache.txt file, and re-run. It seeems stuff was cached from a previous run.

GALAV

@kkoehne I meants same output after deleting the cache file.
:-)

kkoehne

@GALAV , can you post the branch / version of Qt Creator that you are trying to build?

GALAV

@kkoehne
I cloned the highlighted URL

then I executed in the folder:

git submodule update --init --recursive

kkoehne

So master branch ...

I assume you have checked that C:\Qt\6.3.1\msvc2019_64 contains a valid Qt 6 installation?

Can you re-run cmake with --trace argument, log this to a file and upload the dump somewhere to inspect? E.g.

del CMakeCache.txt && cmake --trace -DCMAKE_BUILD_TYPE=Debug -G Ninja -DCMAKE_PREFIX_PATH=C:\Qt\6.3.1\msvc2019_64 C:\Users\Administrator\Desktop\QT-CREATOR-SRC >trace.log 2>&1

GALAV

thanks for providing the command.

it seems i don't have the privileges to attach a log file.

GALAV

https://ctxt.io/2/AADgjVtcFw -- tracelog

kkoehne

CMake thinks the bitness of the Qt version does not match the bitness of the compiler. And indeed, it seems you're trying to build with the x86 compiler, but the Qt version you reference is 64bit.

If you indeed want to build an x86 binary, you most likely have to build Qt yourself. The installer only offers 64 bit binaries by default.

If choosing x86 was an accident, set up the build environment to 64 bit. For instance, launch cmd.exe and run

"C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" amd64

GalHA

I am also running into the same error but on linux ubuntu 20.04

I have Qt 6.3.0 built and trying to build Qt Creator

kkoehne

@GalHA , Qt Creator master branch now expects Qt 6.2.

https://lists.qt-project.org/pipermail/qt-creator/2022-July/009050.html

So you need to install Qt 6.2 or newer.

GalHA

@kkoehne I have Qt 6.3.0 installed...

GALAV

@kkoehne
this :

"C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" amd64

has fixed the problem for me, so thanks alot!
and regarding @GalHA 's problem, maybe the equivalent to linux with gcc might help

kkoehne

@GALAV , cool, then let's mark this thread as solved :)