ci: add ccache support for uwp

.github/workflows/uwp.yml

@@ -6,18 +6,33 @@ jobs:
   build:
     runs-on: windows-latest
 
+    env:
+      CCACHE_DIR: ${{ github.workspace }}/.ccache
+
     steps:
+      - name: Set up build environment
+        run: choco install ccache
+
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
           submodules: true
 
+      - uses: actions/cache@v4
+        with:
+          path: ${{ env.CCACHE_DIR }}
+          key: ccache-uwp-${{ github.sha }}
+          restore-keys: ccache-uwp-
+
       - name: CMake
         run: |
           cmake -B build -DCMAKE_BUILD_TYPE=Release -G "Visual Studio 17 2022" -A x64 -DCMAKE_SYSTEM_NAME=WindowsStore -DCMAKE_SYSTEM_VERSION=10.0.22000.0
           cmake --build build --config Release --parallel 2
         shell: cmd
 
+      - name: ccache -s
+        run: ccache -s
+
       - uses: ilammy/msvc-dev-cmd@v1
 
       - name: Package app

CMakeLists.txt

@@ -37,6 +37,32 @@ else()
 	set(CMAKE_CXX_EXTENSIONS OFF)
 endif()
 
+if(MSVC)
+	# Disable use of separate PDB, Ccache won't cache things otherwise
+	foreach(lang IN ITEMS C CXX)
+		foreach(config IN LISTS CMAKE_BUILD_TYPE CMAKE_CONFIGURATION_TYPES)
+			set(var CMAKE_${lang}_FLAGS)
+			if(NOT config STREQUAL "")
+				string(TOUPPER "${config}" config)
+				string(APPEND var "_${config}")
+			endif()
+			string(REGEX REPLACE "[-/]Z[iI]" "-Z7" ${var} "${${var}}")
+			set(${var} "${${var}}" PARENT_SCOPE)
+		endforeach()
+	endforeach()
+	if(DEFINED CMAKE_MSVC_DEBUG_INFORMATION_FORMAT)
+		string(REGEX REPLACE "ProgramDatabase|EditAndContinue" "Embedded"
+				replaced "${CMAKE_MSVC_DEBUG_INFORMATION_FORMAT}"
+		)
+		set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "${replaced}" PARENT_SCOPE)
+	else()
+		set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT
+				"$<$<CONFIG:Debug,RelWithDebInfo>:Embedded>"
+				PARENT_SCOPE
+		)
+	endif()
+endif()
+
 include(DetectArchitecture)
 if(NOT DEFINED ARCHITECTURE)
 	message(FATAL_ERROR "Unsupported architecture encountered. Ending CMake generation.")