Problem about qtcreator with qt5 and qt6 coexist

damedameu

Using SurfacePro3 with windows10 1511，an old version indeed.
When i want to use qt6 with its corresponding qtcreator directly,
i find that i cannot even enter qtcreator with ERROR message from windows
i couldn't even run the maintenance tool 4.7 with the same error:

i think that was because my windows version is to low that i did not have that dll or what in my system.
and that doesn't matter, then i try to use a old version's qtcreator with qt5
and using the online installer to install qt6.3.1's MinGW,CMake to put these into the qt5's qtcreator. And i think in this way may i could use an IDE to edit qt6 project.

the line below in the following picture is the qt 6.3.1 i deploy manually.

at first i use the cmake 3.29.2 that i have in my PC originally.And i put its path in the Env Var already.It works fine with qt 5.14.2 but occur trouble with qt6.3.1 as below:
C:\Program Files\CMake\share\cmake-3.29\Modules\CMakeTestCXXCompiler.cmake:60: error: The C++ compiler "C:/Qt/Qt 6.3.1/Tools/mingw1120_64/bin/g++.exe" is not able to compile a simple test program. It fails with the following output: Change Dir: 'C:/Users/Surface/AppData/Local/Temp/QtCreator-dRUsfY/qtc-cmake-bIirMBik/CMakeFiles/CMakeScratch/TryCompile-edjkpc' Run Build Command(s): "C:/Program Files/CMake/bin/cmake.exe" -E env VERBOSE=1 jom -f Makefile /nologo cmTC_588db\fast no such file or directory
i can't solve this promblem at all.So i decide to install anothor corresponding cmake(3.29.3 qt6.3.1 default recommend version) in the step installing qt via online installer.
And i try to create a new kit
the configuration are as below:

And the error with
C:\Program Files\CMake\share\cmake-3.29\Modules\CMakeTestCXXCompiler.cmake:60: error: The C++ compiler "C:/Qt/Qt 6.3.1/Tools/mingw1120_64/bin/g++.exe" is not able to compile a simple test program. It fails with the following output: Change Dir: 'C:/Users/Surface/AppData/Local/Temp/QtCreator-dRUsfY/qtc-cmake-bIirMBik/CMakeFiles/CMakeScratch/TryCompile-edjkpc' Run Build Command(s): "C:/Program Files/CMake/bin/cmake.exe" -E env VERBOSE=1 jom -f Makefile /nologo cmTC_588db\fast no such file or directory
disappears.
But another fatal error comes.

then i check the CMakeLists.txt and find that though i create the project with qt6.3.1 kit,qtcreator still generate a qt5 version CMakeLists.txt with qt5core.

HOW should i do to solve these problems and could use Qt5's qtcreator to start programming and building qt6 project.

ChrisW67

SystemParametersInfoForDpi Windows API call used by the current maintenance tool: Minimum supported client Windows 10, version 1607

Qt 6 supported platforms: Windows 10 (1809 or later). Even if you could build on that Surface, or build elsewhere and deploy on the Surface, the Qt 6 executable may not work on that machine.

How should i do to solve these problems and could use Qt5's qtcreator to start programming and building qt6 project.

You are using a version of Qt Creator that predates Qt 6 (Dec 2020) released so it is incapable of generating a Qt 6 aware qmake or cmake configuration.

Manually create or correct the CMakeLists.txt. Here is a fairly generic Qt6 CMakeLists.txt for a project called myproject:

cmake_minimum_required(VERSION 3.16)

project(myproject VERSION 0.1 LANGUAGES CXX)

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 REQUIRED COMPONENTS Widgets)
find_package(Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets)

set(PROJECT_SOURCES
        main.cpp
        widget.cpp
        widget.h
)

if(${QT_VERSION_MAJOR} GREATER_EQUAL 6)
    qt_add_executable(myproject
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
    )
# Define target properties for Android with Qt 6 as:
#    set_property(TARGET myproject APPEND PROPERTY QT_ANDROID_PACKAGE_SOURCE_DIR
#                 ${CMAKE_CURRENT_SOURCE_DIR}/android)
# For more information, see https://doc.qt.io/qt-6/qt-add-executable.html#target-creation
else()
    if(ANDROID)
        add_library(myproject SHARED
            ${PROJECT_SOURCES}
        )
# Define properties for Android with Qt 5 after find_package() calls as:
#    set(ANDROID_PACKAGE_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/android")
    else()
        add_executable(myproject
            ${PROJECT_SOURCES}
        )
    endif()
endif()

target_link_libraries(myproject PRIVATE Qt${QT_VERSION_MAJOR}::Widgets)

# Qt for iOS sets MACOSX_BUNDLE_GUI_IDENTIFIER automatically since Qt 6.1.
# If you are developing for iOS or macOS you should consider setting an
# explicit, fixed bundle identifier manually though.
if(${QT_VERSION} VERSION_LESS 6.1.0)
  set(BUNDLE_ID_OPTION MACOSX_BUNDLE_GUI_IDENTIFIER com.example.myproject)
endif()
set_target_properties(myproject PROPERTIES
    ${BUNDLE_ID_OPTION}
    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
    MACOSX_BUNDLE TRUE
    WIN32_EXECUTABLE TRUE
)

include(GNUInstallDirs)
install(TARGETS myproject
    BUNDLE DESTINATION .
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

if(QT_VERSION_MAJOR EQUAL 6)
    qt_finalize_executable(myproject)
endif()

Christian Ehrlicher

Then modify the CMakeLists.txt to use Qt6Core. I don't see how Qt Creator should know which libraries you want to use.

damedameu

@Christian-Ehrlicher Thanks.I could just modify the CMakeLists.txt and tell cmake to find Qt6core.
It works.
It's you guys that make this community so charming :D

damedameu

@ChrisW67
Yes you are right.My SurfacePro windows version is quite dowdy QAQ
I can rarely use softwares nowadays easily and compatibly with it.
But when i modify CMakeLists.txt to let it search for Qt6's libraries.
It works.
Anyhow,thank you so much for giving me your suggestion.
Love from my heart >=<

damedameu

Hi guys,when i run the example project,there is another error which tells me that I dont have Qt platform plugin.
As below: