Add Clang support and enhance C++20 module configuration in workflow and CMake setup

- Introduced `clang` installation in CI workflow for improved C++20 module support.
- Updated CMake workflow to use Clang as the default compiler and enabled C++ module dependency scanning globally.
- Refined target configurations by adding explicit module source files and consolidating module scanning settings.

Author: gpx1000

.github/workflows/workflow.yml

@@ -45,7 +45,8 @@ jobs:
               libtinyobjloader-dev \
               libstb-dev \
               cmake \
-              ninja-build
+              ninja-build \
+              clang
               # Build and install yaml-cpp from source
               git clone https://github.com/jbeder/yaml-cpp.git
               cd yaml-cpp
@@ -193,7 +194,14 @@ jobs:
       - name: Configure CMake (Unix)
         working-directory: ${{github.workspace}}/attachments
         if: runner.os != 'Windows'
-        run: cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release
+        run: |
+          # Use Clang for better C++20 module support
+          export CC=clang
+          export CXX=clang++
+
+          cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Release \
+            -DCMAKE_CXX_SCAN_FOR_MODULES=ON \
+            -DCMAKE_CXX_FLAGS="-std=c++20"
 
       - name: Build
         working-directory: ${{github.workspace}}/attachments

attachments/CMakeLists.txt

@@ -1,5 +1,8 @@
 cmake_minimum_required (VERSION 3.29)
 
+# Enable C++ module dependency scanning
+set(CMAKE_CXX_SCAN_FOR_MODULES ON)
+
 project (VulkanTutorial)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}/CMake")
@@ -25,7 +28,6 @@ target_link_libraries(VulkanCppModule
 )
 
 set_target_properties(VulkanCppModule PROPERTIES CXX_STANDARD 20)
-set_target_properties(VulkanCppModule PROPERTIES CXX_SCAN_FOR_MODULES ON)
 
 target_sources(VulkanCppModule
         PUBLIC
@@ -36,6 +38,12 @@ target_sources(VulkanCppModule
         "${Vulkan_INCLUDE_DIR}/vulkan/vulkan.cppm"
 )
 
+# Add the vulkan.cppm file directly as a source file
+target_sources(VulkanCppModule
+        PRIVATE
+        "${Vulkan_INCLUDE_DIR}/vulkan/vulkan.cppm"
+)
+
 find_package (tinyobjloader REQUIRED)
 
 find_package (PkgConfig)
@@ -101,7 +109,6 @@ function (add_chapter CHAPTER_NAME)
   set_target_properties (${CHAPTER_NAME} PROPERTIES
     RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CHAPTER_NAME})
   set_target_properties (${CHAPTER_NAME} PROPERTIES CXX_STANDARD 20)
-  set_target_properties (${CHAPTER_NAME} PROPERTIES CXX_SCAN_FOR_MODULES ON)
   target_link_libraries (${CHAPTER_NAME} Vulkan::cppm glfw)
   target_include_directories (${CHAPTER_NAME} PRIVATE ${STB_INCLUDEDIR})