Actually fix Window ccache support in CI

Add CMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded to CI line
- Needs to be before the first project call

Set required CMake Policy for MSVC ccache debug type

.github/workflows/main.yml

@@ -56,6 +56,7 @@ jobs:
         max_attempts: 3
         command: |
           choco install ccache doxygen.install graphviz
+          Add-Content -Path $env:GITHUB_ENV -Value "CCACHE_EXE=$(Resolve-Path C:\ProgramData\chocolatey\lib\ccache\tools\*\ccache.exe)" 
           vcpkg install zlib:x64-windows-static
 
     - name: Generate cache key
@@ -100,6 +101,8 @@ jobs:
       run: cmake "--preset=ci-$("${{ matrix.os }}".split("-")[0])"
         -DCMAKE_BUILD_TYPE=${{ matrix.build_type }}
         -Dsleigh_RELEASE_TYPE=${{ matrix.release }}
+        "-DCMAKE_PROJECT_INCLUDE:FILEPATH=${{ github.workspace }}/cmake/ccache-msvc.cmake"
+        -DCMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded
 
     - name: Build the project
       run: cmake

CMakeLists.txt

@@ -8,6 +8,9 @@
 
 cmake_minimum_required(VERSION 3.18)
 
+# For MSVC ccache to use /Z7 with CMAKE_MSVC_DEBUG_INFORMATION_FORMAT=Embedded
+cmake_policy(SET CMP0141 NEW)
+
 include(cmake/prelude.cmake)
 
 # Sets "library_root" variable for decompiler cpp root directory

cmake/ccache-msvc.cmake

@@ -0,0 +1,34 @@
+# This module configures ccache to work with MSVC
+# Based on: https://github.com/ccache/ccache/wiki/MS-Visual-Studio
+
+# Only do this for Windows MSVC builds
+if(NOT WIN32 OR NOT CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
+  return()
+endif()
+
+# Assume the parent environment has this set
+# Chocolatey creates a shim which doesn't work when renamed
+set(CCACHE_EXE "$ENV{CCACHE_EXE}")
+if(NOT CCACHE_EXE)
+  message(STATUS "ccache not found - MSVC ccache support disabled")
+  return()
+endif()
+message(STATUS "Found ccache - ${CCACHE_EXE}")
+
+message(STATUS "Configuring ccache for MSVC")
+
+file(COPY_FILE
+    "${CCACHE_EXE}" "${CMAKE_BINARY_DIR}/cl.exe"
+    ONLY_IF_DIFFERENT)
+
+# By default Visual Studio generators will use /Zi which is not compatible
+# with ccache, so tell Visual Studio to use /Z7 instead.
+message(STATUS "Setting MSVC debug information format to 'Embedded'")
+set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "$<$<CONFIG:Debug,RelWithDebInfo>:Embedded>")
+
+set(CMAKE_VS_GLOBALS
+    "CLToolExe=cl.exe"
+    "CLToolPath=${CMAKE_BINARY_DIR}"
+    "UseMultiToolTask=true"
+    "DebugInformationFormat=OldStyle"
+    )