CMake modernization

.github/workflows/build.yml

@@ -4,13 +4,12 @@ on: [push, pull_request]
 
 jobs:
   Linux:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     env:
       BUILD_TYPE: Release
       CC: "${{ matrix.cc }}"
       CXX: "${{ matrix.cxx }}"
-      CMAKE_PREFIX_PATH: "/usr"
 
     strategy:
       fail-fast: false
@@ -21,13 +20,13 @@ jobs:
             cmake_options: -DRMLUI_ENABLE_PRECOMPILED_HEADERS=OFF -DRMLUI_SAMPLES_BACKEND=GLFW_GL2
           - cc: clang
             cxx: clang++
-            cmake_options: -DRMLUI_SAMPLES_BACKEND=SDL_VK -DSDL_LIBRARY=SDL2 -DSDL_INCLUDE_DIR=/usr/include/SDL2
+            cmake_options: -DRMLUI_SAMPLES_BACKEND=SDL_VK
           - cmake_options: -DRMLUI_BUILD_TESTING=ON -DRMLUI_ENABLE_PRECOMPILED_HEADERS=OFF
             enable_testing: true
           - cmake_options: -DRMLUI_ENABLE_LOTTIE_PLUGIN=ON -DRMLUI_SAMPLES_BACKEND=X11_GL2
-          - cmake_options: -DRMLUI_DISABLE_RTTI_AND_EXCEPTIONS=ON -DRMLUI_SAMPLES_BACKEND=SDL_GL2 -DSDL_LIBRARY=SDL2 -DSDL_INCLUDE_DIR=/usr/include/SDL2 -DSDL_IMAGE_LIBRARY=/usr/lib/x86_64-linux-gnu/libSDL2_image-2.0.so.0 -DSDL_IMAGE_INCLUDE_DIR=/usr/include/SDL2
-          - cmake_options: -DRMLUI_NO_THIRDPARTY_CONTAINERS=ON -DRMLUI_SAMPLES_BACKEND=SFML_GL2 
-          - cmake_options: -DRMLUI_SAMPLES_BACKEND=SDL_VK -DRMLUI_VK_DEBUG=ON -DRMLUI_ENABLE_PRECOMPILED_HEADERS=OFF -DCMAKE_BUILD_TYPE=Debug -DSDL_LIBRARY=SDL2 -DSDL_INCLUDE_DIR=/usr/include/SDL2
+          - cmake_options: -DRMLUI_DISABLE_RTTI_AND_EXCEPTIONS=ON -DRMLUI_SAMPLES_BACKEND=SDL_GL2
+          - cmake_options: -DRMLUI_NO_THIRDPARTY_CONTAINERS=ON -DRMLUI_SAMPLES_BACKEND=SFML_GL2
+          - cmake_options: -DRMLUI_SAMPLES_BACKEND=SDL_VK -DRMLUI_VK_DEBUG=ON -DRMLUI_ENABLE_PRECOMPILED_HEADERS=OFF -DCMAKE_BUILD_TYPE=Debug
 
     steps:
     - uses: actions/checkout@v3
@@ -44,6 +43,7 @@ jobs:
       working-directory: ${{github.workspace}}/Build
       run: >-
         cmake $GITHUB_WORKSPACE -G Ninja -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DRMLUI_BUILD_LUA_BINDINGS=ON -DRMLUI_BUILD_SAMPLES=ON -DWARNINGS_AS_ERRORS=ON
+        -DCMAKE_MODULE_PATH=$GITHUB_WORKSPACE/CMake/Modules/CI/Linux
         ${{ matrix.cmake_options }}
 
     - name: Build
@@ -124,7 +124,7 @@ jobs:
       working-directory: ${{github.workspace}}/Build
       run: >-
         cmake $env:GITHUB_WORKSPACE -A x64 -DBUILD_SHARED_LIBS=ON -DCMAKE_BUILD_TYPE=$env:BUILD_TYPE -DRMLUI_BUILD_LUA_BINDINGS=ON -DRMLUI_BUILD_SAMPLES=ON -DWARNINGS_AS_ERRORS=ON
-        -DCMAKE_TOOLCHAIN_FILE="C:/vcpkg/scripts/buildsystems/vcpkg.cmake" ${{ matrix.cmake_options }} -DRMLUI_USING_VCPKG=TRUE
+        -DCMAKE_TOOLCHAIN_FILE="C:/vcpkg/scripts/buildsystems/vcpkg.cmake" ${{ matrix.cmake_options }}
 
     - name: Build
       working-directory: ${{github.workspace}}/Build

CMake/Backends.cmake

@@ -1,158 +1,162 @@
-# List of available backends
-list(APPEND RMLUI_SAMPLES_AVAILABLE_BACKENDS
-    "Win32_GL2"
-    "Win32_VK"
-    "X11_GL2"
-    "SDL_GL2"
-    "SDL_GL3"
-    "SDL_VK"
-    "SDL_SDLrenderer"
-    "SFML_GL2"
-    "GLFW_GL2"
-    "GLFW_GL3"
-    "GLFW_VK"
-)
+#[[
+    Details about sample backends, their source code files and linking requirements
+
+    Everytime a new backend gets added or its target name is modified, please update
+    the list of available backends found in OptionsLists.cmake
 
-list(APPEND RMLUI_BACKEND_COMMON_HDR_FILES
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend.h
+    This file is not meant to be used by consumers of the library, only by the RmlUi CMake project
+]]
+
+add_library(rmlui_backend_common_headers INTERFACE)
+target_sources(rmlui_backend_common_headers INTERFACE
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend.h"
 )
 
 add_library(rmlui_backend_Win32_GL2 INTERFACE)
 target_sources(rmlui_backend_Win32_GL2 INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_Win32.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_Win32_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_Win32.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Include_Windows.h
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_Win32.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_Win32_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_Win32.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Include_Windows.h"
 )
-target_link_libraries(rmlui_backend_Win32_GL2 INTERFACE OpenGL::GL)
+target_link_libraries(rmlui_backend_Win32_GL2 INTERFACE rmlui_backend_common_headers OpenGL::GL)
 
 add_library(rmlui_backend_Win32_VK INTERFACE)
-target_sources(rmlui_backend_Win32_VK INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_Win32.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_Win32_VK.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_Win32.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Vulkan/ShadersCompiledSPV.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Vulkan/vk_mem_alloc.h
+target_sources(rmlui_backend_Win32_VK INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_Win32.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_Win32_VK.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_Win32.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Vulkan/ShadersCompiledSPV.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Vulkan/vk_mem_alloc.h"
 )
-target_link_libraries(rmlui_backend_Win32_VK INTERFACE Vulkan::Vulkan)
+target_link_libraries(rmlui_backend_Win32_VK INTERFACE rmlui_backend_common_headers Vulkan::Vulkan)
 
 add_library(rmlui_backend_X11_GL2 INTERFACE)
-target_sources(rmlui_backend_X11_GL2 INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_X11.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_X11_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_X11.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Include_Xlib.h
+target_sources(rmlui_backend_X11_GL2 INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_X11.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_X11_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_X11.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Include_Xlib.h"
 )
 
 # RMLUI_CMAKE_MINIMUM_VERSION_RAISE_NOTICE:
 # Once the minimum CMake version is CMake >= 3.14, "${X11_LIBRARIES}" should
 # be substituted by "X11:X11" in addition to any of the other imported that might
 # be required. More info: 
 # https://cmake.org/cmake/help/latest/module/FindX11.html
-target_link_libraries(rmlui_backend_X11_GL2 INTERFACE OpenGL::GL ${X11_LIBRARIES})
+target_link_libraries(rmlui_backend_X11_GL2 INTERFACE rmlui_backend_common_headers OpenGL::GL ${X11_LIBRARIES})
 
 add_library(rmlui_backend_SDL_GL2 INTERFACE)
-target_sources(rmlui_backend_SDL_GL2 INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SDL_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h
+target_sources(rmlui_backend_SDL_GL2 INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SDL_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h"
 )
-target_link_libraries(rmlui_backend_SDL_GL2 INTERFACE OpenGL::GL SDL::SDL GLEW::GLEW SDL::Image)
+target_link_libraries(rmlui_backend_SDL_GL2 INTERFACE rmlui_backend_common_headers OpenGL::GL SDL2::SDL2 GLEW::GLEW SDL2_image::SDL2_image)
 
 add_library(rmlui_backend_SDL_GL3 INTERFACE)
-target_sources(rmlui_backend_SDL_GL3 INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL3.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SDL_GL3.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL3.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Include_GL3.h
+target_sources(rmlui_backend_SDL_GL3 INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL3.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SDL_GL3.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL3.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Include_GL3.h"
 )
-target_link_libraries(rmlui_backend_SDL_GL3 INTERFACE OpenGL::GL SDL::SDL SDL::Image)
+target_link_libraries(rmlui_backend_SDL_GL3 INTERFACE rmlui_backend_common_headers OpenGL::GL SDL2::SDL2 SDL2_image::SDL2_image)
+if(UNIX)
+    # The OpenGL 3 renderer implementation uses dlopen/dlclose
+    # This is required in some UNIX and UNIX-like operating systems to load shared object files at runtime
+    target_link_libraries(rmlui_backend_SDL_GL3 INTERFACE ${CMAKE_DL_LIBS})
+endif()
 
 add_library(rmlui_backend_SDL_VK INTERFACE)
-target_sources(rmlui_backend_SDL_VK INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SDL_VK.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Vulkan/ShadersCompiledSPV.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Vulkan/vk_mem_alloc.h
+target_sources(rmlui_backend_SDL_VK INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SDL_VK.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Vulkan/ShadersCompiledSPV.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Vulkan/vk_mem_alloc.h"
 )
-target_link_libraries(rmlui_backend_SDL_VK INTERFACE Vulkan::Vulkan SDL::SDL)
+target_link_libraries(rmlui_backend_SDL_VK INTERFACE rmlui_backend_common_headers Vulkan::Vulkan SDL2::SDL2)
+if(UNIX)
+    # The Vulkan renderer implementation uses dlopen/dlclose
+    # This is required in some UNIX and UNIX-like operating systems to load shared object files at runtime
+    target_link_libraries(rmlui_backend_SDL_VK INTERFACE ${CMAKE_DL_LIBS})
+endif()
 
 add_library(rmlui_backend_SDL_SDLrenderer INTERFACE)
-target_sources(rmlui_backend_SDL_SDLrenderer INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_SDL.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SDL_SDLrenderer.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_SDL.h
+target_sources(rmlui_backend_SDL_SDLrenderer INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_SDL.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SDL_SDLrenderer.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SDL.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_SDL.h"
 )
-target_link_libraries(rmlui_backend_SDL_SDLrenderer INTERFACE SDL::SDL SDL::Image)
+target_link_libraries(rmlui_backend_SDL_SDLrenderer INTERFACE rmlui_backend_common_headers SDL2::SDL2 SDL2_image::SDL2_image)
 
 add_library(rmlui_backend_SFML_GL2 INTERFACE)
-target_sources(rmlui_backend_SFML_GL2 INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SFML.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SFML_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SFML.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h
+target_sources(rmlui_backend_SFML_GL2 INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SFML.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_SFML_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_SFML.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h"
 )
-target_link_libraries(rmlui_backend_SFML_GL2 INTERFACE OpenGL::GL
-    rmlui_SFML_old_wrapper SFML::Graphics SFML::Window SFML::System
+target_link_libraries(rmlui_backend_SFML_GL2 INTERFACE 
+    rmlui_backend_common_headers OpenGL::GL rmlui_SFML_old_wrapper SFML::Graphics SFML::Window SFML::System
 )
 if(WIN32)
     target_link_libraries(rmlui_backend_SFML_GL2 INTERFACE SFML::Main)
 endif()
 
 add_library(rmlui_backend_GLFW_GL2 INTERFACE)
-target_sources(rmlui_backend_GLFW_GL2 INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_GLFW_GL2.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h
+target_sources(rmlui_backend_GLFW_GL2 INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_GLFW_GL2.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL2.h"
 )
-target_link_libraries(rmlui_backend_GLFW_GL2 INTERFACE OpenGL::GL glfw)
+target_link_libraries(rmlui_backend_GLFW_GL2 INTERFACE rmlui_backend_common_headers OpenGL::GL glfw)
 
 add_library(rmlui_backend_GLFW_GL3 INTERFACE)
-target_sources(rmlui_backend_GLFW_GL3 INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL3.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_GLFW_GL3.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL3.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Include_GL3.h
+target_sources(rmlui_backend_GLFW_GL3 INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL3.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_GLFW_GL3.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_GL3.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Include_GL3.h"
 )
-target_link_libraries(rmlui_backend_GLFW_GL3 INTERFACE OpenGL::GL glfw)
+target_link_libraries(rmlui_backend_GLFW_GL3 INTERFACE rmlui_backend_common_headers OpenGL::GL glfw)
+if(UNIX)
+    # The OpenGL 3 renderer implementation uses dlopen/dlclose
+    # This is required in some UNIX and UNIX-like operating systems to load shared object files at runtime
+    target_link_libraries(rmlui_backend_GLFW_GL3 INTERFACE ${CMAKE_DL_LIBS})
+endif()
 
 add_library(rmlui_backend_GLFW_VK INTERFACE)
-target_sources(rmlui_backend_GLFW_VK INTERFACE
-    ${RMLUI_BACKEND_COMMON_HDR_FILES}
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_GLFW_VK.cpp
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.h
-    ${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.h
+target_sources(rmlui_backend_GLFW_VK INTERFACE    
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Backend_GLFW_VK.cpp"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Platform_GLFW.h"
+    "${PROJECT_SOURCE_DIR}/Backends/RmlUi_Renderer_VK.h"
 )
-target_link_libraries(rmlui_backend_GLFW_VK INTERFACE Vulkan::Vulkan glfw)
+target_link_libraries(rmlui_backend_GLFW_VK INTERFACE rmlui_backend_common_headers Vulkan::Vulkan glfw)
+if(UNIX)
+    # The Vulkan renderer implementation uses dlopen/dlclose
+    # This is required in some UNIX and UNIX-like operating systems to load shared object files at runtime
+    target_link_libraries(rmlui_backend_GLFW_VK INTERFACE ${CMAKE_DL_LIBS})
+endif()