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cmake: auto-detect ccache to speed up developer builds (#49389)

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Summary:
https://ccache.dev/ is a compiler cache that speeds up subsequent builds. Auto-detecting ccache ensures that it is used on systems where it is available, greatly improving build times for developers. There is no risk in enabling ccache in practice. Please refer to https://ccache.dev/ for a short summary / motivation

Pull Request resolved: https://github.com/pytorch/pytorch/pull/49389

Reviewed By: ejguan

Differential Revision: D27169957

Pulled By: malfet

fbshipit-source-id: 673b60bbceb0d323901c8a992a75792c6da9b805
This commit is contained in:
Leonard Lausen
2021-03-18 14:17:23 -07:00
committed by Facebook GitHub Bot
parent a95abc4648
commit 90bbe0b38b
2 changed files with 17 additions and 0 deletions
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13
CMakeLists.txt
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@ -295,6 +295,19 @@ option(HAVE_SOVERSION "Whether to add SOVERSION to the shared objects" OFF)
cmake_dependent_option(
USE_DEPLOY "Build embedded torch::deploy interpreter" OFF
"BUILD_PYTHON" OFF)
cmake_dependent_option(USE_CCACHE "Attempt using CCache to wrap the compilation" ON "UNIX" OFF)
if(USE_CCACHE)
find_program(CCACHE_PROGRAM ccache)
if(CCACHE_PROGRAM)
set(CMAKE_C_COMPILER_LAUNCHER "${CCACHE_PROGRAM}")
set(CMAKE_CXX_COMPILER_LAUNCHER "${CCACHE_PROGRAM}")
set(CMAKE_CUDA_COMPILER_LAUNCHER "${CCACHE_PROGRAM}")
else()
message(STATUS "Could not find ccache. Consider installing ccache to speed up compilation.")
endif()
endif()
# Since TensorPipe does not support Windows, set it to OFF when WIN32 detected
# On Windows platform, if user does not install libuv in build conda env and
# does not set libuv_ROOT environment variable. Set USE_DISTRIBUTED to OFF.

4
cmake/Summary.cmake
View File

@ -9,6 +9,10 @@ function(caffe2_print_configuration_summary)
message(STATUS " C++ compiler : ${CMAKE_CXX_COMPILER}")
message(STATUS " C++ compiler id : ${CMAKE_CXX_COMPILER_ID}")
message(STATUS " C++ compiler version : ${CMAKE_CXX_COMPILER_VERSION}")
message(STATUS " Using ccache if found : ${USE_CCACHE}")
if(USE_CCACHE)
message(STATUS " Found ccache : ${CCACHE_PROGRAM}")
endif()
message(STATUS " CXX flags : ${CMAKE_CXX_FLAGS}")
message(STATUS " Build type : ${CMAKE_BUILD_TYPE}")
get_directory_property(tmp DIRECTORY ${PROJECT_SOURCE_DIR} COMPILE_DEFINITIONS)