[Development] CMake for Qt5: Cross Compilation for Windows using MinGW-w64

[Loaden]

Hi, there!
I am try to cross compilation qt5 apps on Linux.
By this wiki point: http://www.cmake.org/Wiki/CmakeMingw
I can make the simple qt5 demo works.

main.cpp

> #include <QApplication>
> #include <QLabel>
>
> int main(int argc, char *argv[])
> {
>     QApplication a(argc, argv);
>     QLabel *label = new QLabel("Hello World");
>     label->show();
>     int i;
>     return a.exec();
> }
>

CMakeLists.txt

> cmake_minimum_required(VERSION 2.8.9 FATAL_ERROR)
>
> project(testproject)
>
> # Find includes in corresponding build directories
> set(CMAKE_INCLUDE_CURRENT_DIR ON)
> # Instruct CMake to run moc automatically when needed
> set(CMAKE_AUTOMOC ON)
>
> # Find the QtWidgets library
> find_package(Qt5Widgets)
>
> # Tell CMake to create the helloworld executable
> add_executable(helloworld main.cpp)
>
> # Use the Widgets module from Qt 5
> qt5_use_modules(helloworld Widgets)
>

loaden at qpsoft:~/qpSOFT/Projects/demo/m64$ cmake ..
> -DCMAKE_PREFIX_PATH=/home/loaden/qpSOFT/Projects/BuildQt5-m64/qtbase
> -DCMAKE_TOOLCHAIN_FILE=~/.mingw64.cmake
> -- The C compiler identification is GNU 4.7.1
> -- The CXX compiler identification is GNU 4.7.1
> -- Check for working C compiler: /opt/mingw64/bin/x86_64-w64-mingw32-gcc
> -- Check for working C compiler: /opt/mingw64/bin/x86_64-w64-mingw32-gcc
> -- works
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info - done
> -- Check for working CXX compiler: /opt/mingw64/bin/x86_64-w64-mingw32-g++
> -- Check for working CXX compiler: /opt/mingw64/bin/x86_64-w64-mingw32-g++
> -- works
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Configuring done
> -- Generating done
> -- Build files have been written to: /home/loaden/qpSOFT/Projects/demo/m64
> loaden at qpsoft:~/qpSOFT/Projects/demo/m64$ make
> Scanning dependencies of target helloworld_automoc
> [ 33%] Automoc for target helloworld
> [ 33%] Built target helloworld_automoc
> Scanning dependencies of target helloworld
> [ 66%] Building CXX object CMakeFiles/helloworld.dir/main.cpp.obj
> [100%] Building CXX object
> CMakeFiles/helloworld.dir/helloworld_automoc.cpp.obj
> Linking CXX executable helloworld.exe
> [100%] Built target helloworld
>

When I try another demo, it's failed, and I can't find the reason.
CMakeLists.txt

> cmake_minimum_required(VERSION 2.8.9 FATAL_ERROR)
>
> project(testproject)
>
> # Find includes in corresponding build directories
> set(CMAKE_INCLUDE_CURRENT_DIR ON)
> # Instruct CMake to run moc automatically when needed
> set(CMAKE_AUTOMOC ON)
>
> # Find the QtWidgets library
> find_package(Qt5Widgets REQUIRED)
>
> # Tell CMake to create the helloworld executable
> add_executable(helloworld
>     main.cpp
>     mainwindow.cpp
>     mainwindow.ui
> )
>
> # Use the Widgets module from Qt 5
> qt5_use_modules(helloworld Widgets)
>
> # Support UI files
> qt5_wrap_ui(ui_mainwindow.h mainwindow.ui)
>

I can sure this project can be build for Linux target.
It's just failed for cross build.

loaden at qpsoft:~/qpSOFT/Projects/qtdemo/m64$ cmake ..
> -DCMAKE_PREFIX_PATH=/home/loaden/qpSOFT/Projects/BuildQt5-m64/qtbase
> -DCMAKE_TOOLCHAIN_FILE=~/.mingw64.cmake
> -- The C compiler identification is GNU 4.7.1
> -- The CXX compiler identification is GNU 4.7.1
> -- Check for working C compiler: /opt/mingw64/bin/x86_64-w64-mingw32-gcc
> -- Check for working C compiler: /opt/mingw64/bin/x86_64-w64-mingw32-gcc
> -- works
> -- Detecting C compiler ABI info
> -- Detecting C compiler ABI info - done
> -- Check for working CXX compiler: /opt/mingw64/bin/x86_64-w64-mingw32-g++
> -- Check for working CXX compiler: /opt/mingw64/bin/x86_64-w64-mingw32-g++
> -- works
> -- Detecting CXX compiler ABI info
> -- Detecting CXX compiler ABI info - done
> -- Configuring done
> -- Generating done
> -- Build files have been written to:
> /home/loaden/qpSOFT/Projects/qtdemo/m64
> loaden at qpsoft:~/qpSOFT/Projects/qtdemo/m64$ make
> Scanning dependencies of target helloworld_automoc
> [ 20%] Automoc for target helloworld
> Generating moc_mainwindow.cpp
> No such file or directory
> AUTOMOC: error: process for
> /home/loaden/qpSOFT/Projects/qtdemo/m64/moc_mainwindow.cpp failed:
> No such file or directory
> moc failed...
> make[2]: *** [CMakeFiles/helloworld_automoc] Error 1
> make[1]: *** [CMakeFiles/helloworld_automoc.dir/all] Error 2
> make: *** [all] Error 2
>
>
-- 
Best Regards
Yuchen
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