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Qt Cross Platform Development

Short writeup of Windows / Linux (Ubuntu) cross platform development information with Qt

  • Setup an initial repository
  • Install Qt 5.15.2
  • Install CMake (Linux)
  • Install CMake (Windows)
  • Compile OpenCV 4.5.1 (Linux)
  • Compile OpenCV 4.5.1 (Windows)

Setup an initial repository

Linux:

Windows:

  1. Install Git

  2. With your terminal of chioce and working directory, run git clone https://github.com/cirquit/trdrop.git

Install Qt

  • Qt version 5.15.2
  • Windows:
  • Check to install the correct compiler, I use mingw_810, the 64-bit version
  • Developer Options, check mingw810_64
  • Create an Environment Variable Qt_Install pointing to your downloaded Qt directory. i.e C:\Qt
  • Linux:
  • Check to install the correct compiler, I use g++ 7.4.0

Install CMake (Linux)

Execute in the command line sudo apt-get install cmake

Install CMake (Windows)

Use the .msi installer from https://cmake.org/download/. Pick the option to add CMake to the PATH.

Compile OpenCV (Linux)

Follow the instructions for https://github.com/cirquit/opencv-template. You can check if your installation works by running the examples in this template repository.

Troubleshooting: If the libraries are still not found after the installation, don't forget to run sudo ldconfig -v.

Compile OpenCV (Windows)

  1. Download OpenCV version 4.5.1 from https://opencv.org/releases/, not the Win Pack, but the Sources. Extract the opencv-4.5.1 directory to somewhere on your computer.

  2. Create an Environment Variable OpenCV_DIR pointing to your extracted OpenCV source code. i.e Z:\3rdparty\opencv-4.5.1

2.1. Add the following folders to your path

%Qt_Install%\Tools\mingw810_64\bin
%Qt_Install%\5.15.2\mingw81_64\bin
  1. CMake Options:
Source code: (your opencv directory)
Where to build the binaries: (your opencv directory)/build_64

Then click Configure, choose the following settings:

Specify the generator for this project: MinGW Makefiles
Specify native compilers, next
Compilers C:   (your Qt installation)\Tools\mingw810_64\bin\gcc.exe
Compilers C++: (your Qt installation)\Tools\mingw810_64\bin\g++.exe

Click Finish.

  1. Pick the following flags configuration (deviating from the default configuration):
[ ] Build_JAVA
[ ] Build_opencv_java_bindings_generator
[ ] Build_opencv_python_bindings_generator
CMAKE_BUILD_TYPE: Release
[X] WITH_OPENGL
[X] WITH_QT
[ ] WITH_OPENCL_D3D11_NV

  1. Click Generate

  2. Once finished, with your terminal of choice, cd into %OpenCV_DIR%/build_64

  3. Run the following commands:

mingw32-make -j 8
mingw32-make install

Running Trdrop with Qt Creator (Windows)

  1. Open trdrop.pro set config to MinGW 8.1.0 64 Bit, Build Config to Release.

  2. With your terminal of chioce, go to the release directory of the application in my case C:\git\trdrop\build-trdrop-Desktop_Qt_5_15_2_MinGW_64_bit-Release\release

  3. Execute the following commands:

copy %OpenCV_Dir%\build_64\install\x64\mingw\bin\*.dll .
copy %Qt_Install%\Tools\mingw810_64\bin\*.dll .
windeployqt.exe --qmldir ..\..\trdrop .
  1. Running after compiling from Qt Creator should work. You can find the built binaries in trdrop_root\build-trdrop-Desktop_Qt_5_15_2_MinGW_64_bit-Release\release