ClickHouse/cmake/find/ccache.cmake

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if (CMAKE_CXX_COMPILER_LAUNCHER MATCHES "ccache" OR CMAKE_CXX_COMPILER_LAUNCHER MATCHES "ccache")
set(COMPILER_MATCHES_CCACHE 1)
else()
set(COMPILER_MATCHES_CCACHE 0)
endif()
if ((ENABLE_CCACHE OR NOT DEFINED ENABLE_CCACHE) AND NOT COMPILER_MATCHES_CCACHE)
find_program (CCACHE_FOUND ccache)
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if (CCACHE_FOUND)
set(ENABLE_CCACHE_BY_DEFAULT 1)
else()
set(ENABLE_CCACHE_BY_DEFAULT 0)
endif()
endif()
if (NOT CCACHE_FOUND AND NOT DEFINED ENABLE_CCACHE AND NOT COMPILER_MATCHES_CCACHE)
message(WARNING "CCache is not found. We recommend setting it up if you build ClickHouse from source often. "
"Setting it up will significantly reduce compilation time for 2nd and consequent builds")
endif()
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# https://ccache.dev/
option(ENABLE_CCACHE "Speedup re-compilations using ccache (external tool)" ${ENABLE_CCACHE_BY_DEFAULT})
if (NOT ENABLE_CCACHE)
return()
endif()
if (CCACHE_FOUND AND NOT COMPILER_MATCHES_CCACHE)
execute_process(COMMAND ${CCACHE_FOUND} "-V" OUTPUT_VARIABLE CCACHE_VERSION)
string(REGEX REPLACE "ccache version ([0-9\\.]+).*" "\\1" CCACHE_VERSION ${CCACHE_VERSION})
if (CCACHE_VERSION VERSION_GREATER "3.2.0" OR NOT CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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message(STATUS "Using ${CCACHE_FOUND} ${CCACHE_VERSION}")
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set (CMAKE_CXX_COMPILER_LAUNCHER ${CCACHE_FOUND} ${CMAKE_CXX_COMPILER_LAUNCHER})
set (CMAKE_C_COMPILER_LAUNCHER ${CCACHE_FOUND} ${CMAKE_C_COMPILER_LAUNCHER})
set_property (GLOBAL PROPERTY RULE_LAUNCH_LINK ${CCACHE_FOUND})
# debian (debhelpers) set SOURCE_DATE_EPOCH environment variable, that is
# filled from the debian/changelog or current time.
#
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# - 4.0+ ccache always includes this environment variable into the hash
# of the manifest, which do not allow to use previous cache,
# - 4.2+ ccache ignores SOURCE_DATE_EPOCH for every file w/o __DATE__/__TIME__
#
# So for:
# - 4.2+ does not require any sloppiness
# - 4.0+ will ignore SOURCE_DATE_EPOCH environment variable.
if (CCACHE_VERSION VERSION_GREATER_EQUAL "4.2")
message(STATUS "ccache is 4.2+ no quirks for SOURCE_DATE_EPOCH required")
elseif (CCACHE_VERSION VERSION_GREATER_EQUAL "4.0")
message(STATUS "Ignore SOURCE_DATE_EPOCH for ccache")
set_property (GLOBAL PROPERTY RULE_LAUNCH_COMPILE "env -u SOURCE_DATE_EPOCH")
set_property (GLOBAL PROPERTY RULE_LAUNCH_LINK "env -u SOURCE_DATE_EPOCH")
endif()
else ()
message(${RECONFIGURE_MESSAGE_LEVEL} "Not using ${CCACHE_FOUND} ${CCACHE_VERSION} bug: https://bugzilla.samba.org/show_bug.cgi?id=8118")
endif ()
elseif (NOT CCACHE_FOUND AND NOT COMPILER_MATCHES_CCACHE)
message (${RECONFIGURE_MESSAGE_LEVEL} "Cannot use ccache")
endif ()