Added: CI mingw build

Author: TheNicker

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

@@ -25,7 +25,7 @@ jobs:
       matrix:
         os: [windows-latest, ubuntu-latest]
         build_type: [Release]
-        c_compiler: [gcc, clang, cl]
+        c_compiler: [gcc, clang, cl, mingw]
         include:
           - os: windows-latest
             c_compiler: cl
@@ -43,6 +43,8 @@ jobs:
             c_compiler: clang
           - os: ubuntu-latest
             c_compiler: cl
+          - os: windows-latest
+            c_compiler: mingw
 
     steps:
     - uses: actions/checkout@v3
@@ -83,3 +85,9 @@ jobs:
       if: matrix.os == 'ubuntu-latest'
       run: |
         ./ImageLoaderExample
+
+    - name: Test Ubuntu (mingw)
+      working-directory: ${{ steps.strings.outputs.build-output-dir }}/Example
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        ./ImageLoaderExample.exe

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})

External/libpng

@@ -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)