activate ccache for selected win builds (#28735)

cmake/ccache.cmake

@@ -20,6 +20,18 @@ if ($ENV{GRPC_BUILD_ENABLE_CCACHE})
     message(STATUS "Will use ccache as compiler launcher: ${gRPC_CCACHE_BINARY}")
     set(CMAKE_C_COMPILER_LAUNCHER   ${gRPC_CCACHE_BINARY})
     set(CMAKE_CXX_COMPILER_LAUNCHER ${gRPC_CCACHE_BINARY})
+
+    # avoid conflicts when multiple processes try to write to PDB files. Instead make debug info part of object files.
+    if(CMAKE_BUILD_TYPE STREQUAL "Debug")
+      string(REPLACE "/Zi" "/Z7" CMAKE_CXX_FLAGS_DEBUG "${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()
   else()
     message(STATUS "Build will not use ccache (ccache binary not found).")
   endif()

tools/internal_ci/helper_scripts/prepare_build_windows.bat

@@ -42,10 +42,16 @@ netsh interface ip add dnsservers "Local Area Connection 8" 8.8.4.4 index=3
 @rem Install nasm (required for boringssl assembly optimized build as boringssl no long supports yasm)
 @rem Downloading from GCS should be very reliables when on a GCP VM.
 mkdir C:\nasm
-curl -sSL -o C:\nasm\nasm.exe https://storage.googleapis.com/grpc-build-helper/nasm-2.15.05/nasm.exe || goto :error
+curl -sSL --fail -o C:\nasm\nasm.exe https://storage.googleapis.com/grpc-build-helper/nasm-2.15.05/nasm.exe || goto :error
 set PATH=C:\nasm;%PATH%
 nasm
 
+@rem Install ccache
+mkdir C:\ccache
+curl -sSL --fail -o C:\ccache\ccache.exe https://storage.googleapis.com/grpc-build-helper/ccache-4.6-windows-64/ccache.exe || goto :error
+set PATH=C:\ccache;%PATH%
+ccache --version
+
 @rem Only install C# dependencies if we are running C# tests
 If "%PREPARE_BUILD_INSTALL_DEPS_CSHARP%" == "true" (
   @rem C# prerequisites: Install dotnet SDK

tools/internal_ci/helper_scripts/prepare_ccache.bat

@@ -0,0 +1,21 @@
+@rem Copyright 2022 The gRPC Authors
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem     http://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+
+@rem Call this script to configure ccache (compiler cache to speed up builds)
+
+@rem Allow use of ccache in builds that support that.
+set GRPC_BUILD_ENABLE_CCACHE=true
+
+@rem Redis instance housed in grpc-testing cloud project serves as the main compiler cache
+set CCACHE_SECONDARY_STORAGE=redis://10.76.145.84:6379

tools/internal_ci/windows/grpc_build_artifacts.bat

@@ -28,9 +28,14 @@ cd /d %~dp0\..\..\..
 set PREPARE_BUILD_INSTALL_DEPS_PYTHON=true
 call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
 
+call tools/internal_ci/helper_scripts/prepare_ccache.bat || exit /b 1
+
 python tools/run_tests/task_runner.py -f artifact windows %TASK_RUNNER_EXTRA_FILTERS% -j 4 --inner_jobs 4
 set RUNTESTS_EXITCODE=%errorlevel%
 
+@rem show ccache stats
+ccache --show-stats
+
 bash tools/internal_ci/helper_scripts/store_artifacts_from_moved_src_tree.sh
 
 exit /b %RUNTESTS_EXITCODE%

tools/internal_ci/windows/grpc_run_tests_matrix.bat

@@ -35,6 +35,8 @@ If Not "%RUN_TESTS_FLAGS%"=="%RUN_TESTS_FLAGS:python=%" (
 )
 call tools/internal_ci/helper_scripts/prepare_build_windows.bat || exit /b 1
 
+call tools/internal_ci/helper_scripts/prepare_ccache.bat || exit /b 1
+
 @rem TODO(https://github.com/grpc/grpc/issues/28011): Remove once Windows Kokoro workers'
 @rem   Python installs have been upgraded. Currently, removing this line will cause
 @rem   run_tests.py to fail to spawn test subprocesses.
@@ -43,4 +45,7 @@ python3 tools/run_tests/start_port_server.py || exit /b 1
 python3 tools/run_tests/run_tests_matrix.py %RUN_TESTS_FLAGS%
 set RUNTESTS_EXITCODE=%errorlevel%
 
+@rem show ccache stats
+ccache --show-stats
+
 exit /b %RUNTESTS_EXITCODE%