[SYCL][CI] Enable sccache on Windows (#5589)

Fixes #5568 and #5569

Author: Alexander Batashev

.github/workflows/sycl_windows_build_and_test.yml

@@ -17,6 +17,7 @@ jobs:
       run: |
         choco install -y cuda --version 11.6.0.51123
         choco install -y ninja
+        choco install -y sccache --version 0.2.15
         refreshenv
         echo CUDA_PATH=%CUDA_PATH%
         echo CUDA_PATH=%CUDA_PATH% >> %GITHUB_ENV%
@@ -49,6 +50,8 @@ jobs:
           --cmake-opt="-DCMAKE_C_COMPILER=cl" ^
           --cmake-opt="-DCMAKE_CXX_COMPILER=cl" ^
           --cmake-opt="-DCMAKE_INSTALL_PREFIX=%GITHUB_WORKSPACE%\install" ^
+          --cmake-opt="-DCMAKE_CXX_COMPILER_LAUNCHER=sccache" ^
+          --cmake-opt="-DCMAKE_C_COMPILER_LAUNCHER=sccache" ^
           --cuda
     - name: Build
       shell: cmd
@@ -64,4 +67,4 @@ jobs:
       uses: actions/upload-artifact@v2
       with:
         name: sycl_windows_default
-        path: install/**/*
+        path: install/**/*

sycl/CMakeLists.txt

@@ -62,7 +62,23 @@ if(MSVC)
   include(LLVMCheckLinkerFlag)
   llvm_check_linker_flag(CXX "/DEBUG" LINKER_SUPPORTS_DEBUG)
   if(LINKER_SUPPORTS_DEBUG)
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zi")
+    # sccache is not compatible with /Zi flag
+    if (CMAKE_CXX_COMPILER_LAUNCHER STREQUAL "sccache")
+      # CMake may put /Zi by default
+      if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+        string(REPLACE "/Zi" "/Z7" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
+        string(REPLACE "/Zi" "/Z7" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
+      elseif(CMAKE_BUILD_TYPE STREQUAL "Release")
+        string(REPLACE "/Zi" "/Z7" CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}")
+        string(REPLACE "/Zi" "/Z7" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
+      elseif(CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo")
+        string(REPLACE "/Zi" "/Z7" CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}")
+        string(REPLACE "/Zi" "/Z7" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
+      endif()
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Z7")
+    else()
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zi")
+    endif()
     add_link_options("/DEBUG")
 
     # Enable unreferenced removal and ICF in Release mode.