QT NAMES Qt6 Qt5 COMPONENTS Core Core5Compat not working

xavierbaez

Hello

the QT_MAJOR_VERSION is failing.
It's detecting Qt5 but I want Qt6

Here is the code CMakeLists.txt:

set(CMAKE_INCLUDE_CURRENT_DIR  ON)

set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)


find_package(QT NAMES Qt6 Qt5 COMPONENTS Core Core5Compat REQUIRED)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Core5Compat Network Gui Qml REQUIRED)

target_link_libraries(${PROJECT_NAME} PUBLIC Qt${QT_VERSION_MAJOR}::Qt5Compat)

Here is the error

CMake Error at /usr/lib/cmake/Qt5/Qt5Config.cmake:28 (find_package):
  Could not find a package configuration file provided by "Qt5Core5Compat"

I have Arch Linux.
Here are the packages I have:

pacman -Q | grep -i qt6
qt6-5compat 6.4.3-1
qt6-base 6.4.3-1
qt6-declarative 6.4.3-1
qt6-multimedia 6.4.3-1
qt6-multimedia-ffmpeg 6.4.3-1
qt6-positioning 6.4.3-1
qt6-quick3d 6.4.3-1
qt6-quicktimeline 6.4.3-1
qt6-serialport 6.4.3-1
qt6-shadertools 6.4.3-1
qt6-svg 6.4.3-1
qt6-tools 6.4.3-1
qt6-translations 6.4.3-1
qt6-webchannel 6.4.3-1
qt6-webengine 6.4.3-1

Diego Iastrubni

@xavierbaez said in QT NAMES Qt6 Qt5 COMPONENTS Core Core5Compat not working:

CMake Error at /usr/lib/cmake/Qt5/Qt5Config.cmake:28 (find_package):

You also have Qt5 - and that is getting picked by cmake. You need to "ifdef core5compat".

See this:

if (Qt6_FOUND)
    find_package(Qt6 REQUIRED COMPONENTS Core5Compat)
endif()

Do you really need Qt5 support? If you work "hard enough", you can also have qt4 support.. .but, is it worth it?

xavierbaez

@Diego-Iastrubni okay I will try that
But it’s supposed to pick up MAJOR and MINOR