Can not set QTSDK DIRs within QTCreator

Allon

Hi,
Here is my compilation parameters screen:

I have installed qt5_15_2 qt sdk on my linux and want to use the cmake files from QTSDK and not from my distribution.
I can not find a way to do it except changing all the xxx_DIR one by one (here I have set Qt5_DIR by hand).
Could someone tell me if there is a value to change to autodetect the files into QTSDK?
Thanks a lots in advance,
Emmanuel

sierdzio

You need to add this Qt version in Qt Creator settings, then create a new Kit based on it. There is absolutely no need to provide any paths other than the path to qmake.

cristian-adam

What value do you have for the CMake variable CMAKE_PREFIX_PATH?

Otherwise CMake has the --debug-find which prints information about the find_package calls and the locations where it looks for packages.

Allon

@sierdzio It is already autorecognised, I think the problem comes from cmake setting.

Allon

@cristian-adam HI,
Thanks for your answer.
I set it here:

In QtCreator parameters.
Regards,
Emmanuel

cristian-adam

For the CMAKE_PREFIX_PATH you only need the path without lib/cmake since CMake is adding that automagically, see https://cmake.org/cmake/help/latest/command/find_package.html#config-mode-search-procedure

You can set CMAKE_IGNORE_PATH to /usr/x86_64-linux-gnu/ but that might not find other CMake packages in the system.

CMake's --debug-find is your friend here, you can find out what CMake is doing by analyzing the output.

Allon

@cristian-adam said in Can not set QTSDK DIRs within QTCreator:

/usr/x86_64-linux-gn

Thanks a lot for your help. I will have time on wednesday to work furthur on my problem and will let you posted of my progress.
Emmanuel

Allon

Hi,
When running in command line, everything is fine:
CMake Debug Log at /home/charruau/Qt5_15_2/5.15.2/gcc_64/lib/cmake/Qt5Network/Qt5NetworkConfig.cmake:99 (find_package):
/home/charruau/Qt5_15_2/5.15.2/gcc_64/lib/cmake/Qt5Core/Qt5CoreConfig.cmake

Call Stack (most recent call first):
/home/charruau/Qt5_15_2/5.15.2/gcc_64/lib/cmake/Qt5Qml/Qt5QmlConfig.cmake:99 (find_package)
/home/charruau/Qt5_15_2/5.15.2/gcc_64/lib/cmake/Qt5/Qt5Config.cmake:28 (find_package)
CMakeLists.txt:102 (find_package)

It is pointing to the right libs.

I am still not able to do the same within QTCreator :(

QTCreator is still point at libs within /usr !

cristian-adam

You can import a console build in Qt Creator, and use that configuration.

But Qt Creator when it configures a project does the same thing that you would do from command line. A clean build or "Re-configure with initial parameters" should fix the issue.

ziller

Just a note, since this is a behavior that I myself regularly stumble over:

If you have an existing build, with an existing CMakeCache.txt, and that detected a framework like Qt but a version that you didn't want, if just change the CMAKE_PREFIX_PATH to something else and re-run CMake, it will not re-detect the framework with the new cmake prefix path. It already found the framework, so it doesn't re-detect. You have to remove the CMakeCache.txt first, then call CMake with the new CMAKE_PREFIX_PATH to force it to re-detect the different version.

Allon

@ziller I removed the CMakeCache.txt.
Somehow now it is compiling, but I can not know what I did.
But I am quite sure I need still to resolve the following problem.
All my qt dirs

are pointing to the distro files.
I would like them to be my qt sdk one, example:
/home/charruau/Qt5_15_2/5.15.2/gcc_64/lib/cmake/Qt5Core/ for QT5_Core.
How do you do to do this?
My cmake_prefix_path is pointing to the right place.
cmake_install_prefix is not doing anything.
Thanks in advance

cristian-adam

I can only assume that you have a Kit that doesn't have the Qt SDK selected as the Qt version and you configure with an empty CMAKE_PREFIX_PATH and then CMake picks up your system Qt.

Then you tried changing the CMAKE_PREFIX_PATH in the Current configuration and not the Initial Configuration, but that only changes the CMAKE_PREFIX_PATH cache variable and not all the Qt5*_DIR cache variables.

I have made a screencast showcasing this case: https://bugreports.qt.io/secure/attachment/128619/QtCreator-7.0.2-Linux-system-vs-qtsdk.mp4

Make sure that your Kit contains the right Qt version and / or that you change the Initial Configuration value of CMAKE_PREFIX_PATH.