ccache.cmake

# Use ccache if found ccache program

if(NOT WIN32)
  find_program(CCACHE_PATH ccache)
  if(CCACHE_PATH)
    execute_process(COMMAND ccache -V OUTPUT_VARIABLE ccache_output)
    execute_process(COMMAND ccache -s cache directory
                    OUTPUT_VARIABLE cache_directory)
    string(REGEX MATCH "[0-9]+.[0-9]+" ccache_version ${ccache_output})
    message(STATUS "ccache is founded, use ccache to speed up compile on Unix.")
    # show statistics summary of ccache
    message("ccache version\t\t\t    " ${ccache_version} "\n"
            ${cache_directory})
    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE_PATH})
    set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ${CCACHE_PATH})
  endif()
elseif("${CMAKE_GENERATOR}" STREQUAL "Ninja")
  # (Note:zhouwei25) Only Ninja Generator can support sccache now
  find_program(SCCACHE_PATH sccache)

  if(SCCACHE_PATH)
    execute_process(COMMAND sccache -V OUTPUT_VARIABLE sccache_version)
    message(
      STATUS
        "sccache is founded, use [${SCCACHE_PATH}] to speed up compile on Windows."
    )

    set(CMAKE_C_COMPILER_LAUNCHER ${SCCACHE_PATH})
    set(CMAKE_CXX_COMPILER_LAUNCHER ${SCCACHE_PATH})
    # (Note:zhouwei25) sccache for cuda compiler has bug so that it can't be hit
    # refer to https://github.com/mozilla/sccache/issues/1017, so we fix it
    set(CMAKE_CUDA_COMPILER_LAUNCHER ${SCCACHE_PATH})
  endif()
endif()