Added: CI mingw build

.github/workflows/cmake-multi-platform.yml

@@ -1,85 +1,88 @@
-# This starter workflow is for a CMake project running on multiple platforms. There is a different starter workflow if you just want a single platform.
-# See: https://github.com/actions/starter-workflows/blob/main/ci/cmake-single-platform.yml
 name: CMake on multiple platforms
 
 on:
   push:
-    branches: [ "master"]
+    branches: [ "master" ]
   pull_request:
-    branches: [ "master"]
+    branches: [ "master" ]
 
 jobs:
   build:
     runs-on: ${{ matrix.os }}
 
     strategy:
-      # Set fail-fast to false to ensure that feedback is delivered for all matrix combinations. Consider changing this to true when your workflow is stable.
       fail-fast: true
-
-      # Set up a matrix to run the following 3 configurations:
-      # 1. <Windows, Release, latest MSVC compiler toolchain on the default runner image, default generator>
-      # 2. <Linux, Release, latest GCC compiler toolchain on the default runner image, default generator>
-      # 3. <Linux, Release, latest Clang compiler toolchain on the default runner image, default generator>
-      #
-      # To add more build types (Release, Debug, RelWithDebInfo, etc.) customize the build_type list.
       matrix:
-        os: [windows-latest, ubuntu-latest]
+        os: [ubuntu-latest, windows-latest]
         build_type: [Release]
-        c_compiler: [gcc, clang, cl]
+        c_compiler: [gcc, clang, cl, x86_64-w64-mingw32-gcc]
+
         include:
           - os: windows-latest
             c_compiler: cl
             cpp_compiler: cl
+            exe_suffix: .exe
+            mingw: false
+
           - os: ubuntu-latest
             c_compiler: gcc
             cpp_compiler: g++
+            exe_suffix: ""
+            mingw: false
+
           - os: ubuntu-latest
             c_compiler: clang
             cpp_compiler: clang++
+            exe_suffix: ""
+            mingw: false
+
+          - os: ubuntu-latest
+            c_compiler: x86_64-w64-mingw32-gcc
+            cpp_compiler: x86_64-w64-mingw32-g++
+            exe_suffix: .exe
+            mingw: true
+
         exclude:
           - os: windows-latest
             c_compiler: gcc
           - os: windows-latest
             c_compiler: clang
+          - os: windows-latest
+            c_compiler: x86_64-w64-mingw32-gcc
           - os: ubuntu-latest
             c_compiler: cl
 
     steps:
-    - uses: actions/checkout@v3
-
-    - name: Git update submodules 
-      run: |
-        git submodule update --init --recursive --depth 1
+      - uses: actions/checkout@v3
+
+      - name: Install MinGW (only if mingw is true)
+        if: matrix.mingw == true
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y mingw-w64
 
-    - name: Set reusable strings
-      # Turn repeated input strings (such as the build output directory) into step outputs. These step outputs can be used throughout the workflow file.
-      id: strings
-      shell: bash
-      run: |
-        echo "build-output-dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
+      - name: Update submodules
+        run: git submodule update --init --recursive --depth 1
 
-    - name: Configure CMake
-      # Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
-      # See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
-      run: >
-        cmake -B ${{ steps.strings.outputs.build-output-dir }}
-        -DCMAKE_CXX_COMPILER=${{ matrix.cpp_compiler }}
-        -DCMAKE_C_COMPILER=${{ matrix.c_compiler }}
-        -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
-        -S ${{ github.workspace }}
+      - name: Set build directory
+        id: vars
+        run: echo "dir=${{ github.workspace }}/build" >> "$GITHUB_OUTPUT"
 
-    - name: Build
-      # Build your program with the given configuration. Note that --config is needed because the default Windows generator is a multi-config generator (Visual Studio generator).
-      run: cmake --build ${{ steps.strings.outputs.build-output-dir }} --config ${{ matrix.build_type }}
+      - name: Configure CMake
+        run: >
+          cmake -S . -B ${{ github.workspace }}/build
+          -DCMAKE_C_COMPILER=${{ matrix.c_compiler }}
+          -DCMAKE_CXX_COMPILER=${{ matrix.cpp_compiler }}
+          -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
+          ${{ matrix.mingw && '-DCMAKE_TOOLCHAIN_FILE=mingw-w64-x86_64.cmake' || '' }}
 
-    - name: Test windows
-      working-directory: ${{ steps.strings.outputs.build-output-dir }}/Example/Release
-      if: matrix.os == 'windows-latest'
-      run: |
-        ./ImageLoaderExample.exe
+      - name: Build
+        run: cmake --build ${{ github.workspace }}/build --config ${{ matrix.build_type }}
 
-    - name: Test Ubuntu
-      working-directory: ${{ steps.strings.outputs.build-output-dir }}/Example
-      if: matrix.os == 'ubuntu-latest'
-      run: |
-        ./ImageLoaderExample
+      - name: Run tests
+        if: matrix.mingw == false
+        working-directory: >-
+          ${{ github.workspace }}/build/Example${{
+            matrix.os == 'windows-latest' && format('/{0}', matrix.build_type) || ''
+          }}
+        run: ./ImageLoaderExample${{ matrix.exe_suffix }}

Codecs/CodecJPG/CMakeLists.txt

@@ -21,8 +21,13 @@ endif()
 
 # ======== Platform-specific file extensions ========
 if(WIN32)
-    set(JPG_RUNTIME_NAME "turbojpeg.dll")
-    set(JPG_IMPLIB_NAME "turbojpeg.lib")
+    if (MINGW)
+        set(JPG_RUNTIME_NAME "libturbojpeg.dll")
+        set(JPG_IMPLIB_NAME "libturbojpeg.dll.a")
+    else()
+        set(JPG_RUNTIME_NAME "turbojpeg.dll")
+        set(JPG_IMPLIB_NAME "turbojpeg.lib")
+    endif()
 elseif(APPLE)
     set(JPG_RUNTIME_NAME  "libturbojpeg.dylib")
     set(JPG_IMPLIB_NAME "") # No import libs on macOS
@@ -50,6 +55,10 @@ set(LibJpegTurboArgs
     -DCMAKE_INSTALL_PREFIX=${TurboJpegBinBaseDir}/install
 )
 
+if (CMAKE_TOOLCHAIN_FILE)
+    get_filename_component(CMAKE_TOOLCHAIN_FILE_ABSOLUTE "${CMAKE_TOOLCHAIN_FILE}" ABSOLUTE)
+    list(APPEND LibJpegTurboArgs -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE_ABSOLUTE})
+endif()
 # Enable NASM on Windows if needed
 if(WIN32 AND NOT ${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Linux")
     list(APPEND LibJpegTurboArgs -DCMAKE_ASM_NASM_COMPILER=${NASMPATH})

mingw-w64-x86_64.cmake

@@ -0,0 +1,43 @@
+
+#Usage: cmake -DCMAKE_TOOLCHAIN_FILE=mingw-w64-x86_64.cmake
+
+set(CMAKE_SYSTEM_NAME Windows)
+
+
+set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
+
+# cross compilers to use for C, C++ and Fortran
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_Fortran_COMPILER ${TOOLCHAIN_PREFIX}-gfortran)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+
+set(CMAKE_FIND_ROOT_PATH /usr/${TOOLCHAIN_PREFIX})
+
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_SYSTEM_PROCESSOR x86_64)
+set(CMAKE_SYSTEM_VERSION 10)
+
+
+function (createSymLink target symlink)
+    cmake_path(GET symlink PARENT_PATH parentPath)
+    file(MAKE_DIRECTORY ${parentPath})
+    execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink ${target} ${symlink})
+endfunction()
+
+# MINGW defaults max SDK version to Windows server 2003 (0x0502) 
+# For supporting newer functionality, overriding is needed, otherwise code won't compile
+# override with Windows 10 (0x0A00) SDK version
+add_compile_definitions(_WIN32_WINNT=0x0A00)
+
+set(CASE_SENSITIVE_FIX_FOR_MINGW_PATH ${CMAKE_CURRENT_BINARY_DIR}/mingw-w64)
+createSymLink(/usr/x86_64-w64-mingw32/include/windows.h ${CASE_SENSITIVE_FIX_FOR_MINGW_PATH}/Include/Windows.h)
+createSymLink(/usr/x86_64-w64-mingw32/include/shlobj.h ${CASE_SENSITIVE_FIX_FOR_MINGW_PATH}/Include/ShlObj.h)
+createSymLink(/usr/x86_64-w64-mingw32/include/dbghelp.h ${CASE_SENSITIVE_FIX_FOR_MINGW_PATH}/Include/DbgHelp.h)
+createSymLink(/usr/x86_64-w64-mingw32/include/commctrl.h ${CASE_SENSITIVE_FIX_FOR_MINGW_PATH}/Include/CommCtrl.h)
+createSymLink(/usr/x86_64-w64-mingw32/include/shellscalingapi.h ${CASE_SENSITIVE_FIX_FOR_MINGW_PATH}/Include/ShellScalingApi.h)
+createSymLink(/usr/x86_64-w64-mingw32/include/psapi.h ${CASE_SENSITIVE_FIX_FOR_MINGW_PATH}/Include/Psapi.h)
+
+include_directories(${CASE_SENSITIVE_FIX_FOR_MINGW_PATH}/Include)