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54 lines
2.7 KiB
CMake
54 lines
2.7 KiB
CMake
# Setup integration with ccache to speed up builds, see https://ccache.dev/
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if (CMAKE_CXX_COMPILER_LAUNCHER MATCHES "ccache" OR CMAKE_C_COMPILER_LAUNCHER MATCHES "ccache")
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# custom compiler launcher already defined, most likely because cmake was invoked with like "-DCMAKE_CXX_COMPILER_LAUNCHER=ccache" or
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# via environment variable --> respect setting and trust that the launcher was specified correctly
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message(STATUS "Using custom C compiler launcher: ${CMAKE_C_COMPILER_LAUNCHER}")
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message(STATUS "Using custom C++ compiler launcher: ${CMAKE_CXX_COMPILER_LAUNCHER}")
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return()
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endif()
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option(ENABLE_CCACHE "Speedup re-compilations using ccache (external tool)" ON)
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if (NOT ENABLE_CCACHE)
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message(STATUS "Using ccache: no (disabled via configuration)")
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return()
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endif()
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find_program (CCACHE_EXECUTABLE ccache)
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if (NOT CCACHE_EXECUTABLE)
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message(${RECONFIGURE_MESSAGE_LEVEL} "Using ccache: no (Could not find find ccache. To significantly reduce compile times for the 2nd, 3rd, etc. build, it is highly recommended to install ccache. To suppress this message, run cmake with -DENABLE_CCACHE=0)")
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return()
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endif()
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execute_process(COMMAND ${CCACHE_EXECUTABLE} "-V" OUTPUT_VARIABLE CCACHE_VERSION)
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string(REGEX REPLACE "ccache version ([0-9\\.]+).*" "\\1" CCACHE_VERSION ${CCACHE_VERSION})
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set (CCACHE_MINIMUM_VERSION 3.3)
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if (CCACHE_VERSION VERSION_LESS_EQUAL ${CCACHE_MINIMUM_VERSION})
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message(${RECONFIGURE_MESSAGE_LEVEL} "Using ccache: no (found ${CCACHE_EXECUTABLE} (version ${CCACHE_VERSION}), the minimum required version is ${CCACHE_MINIMUM_VERSION}")
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return()
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endif()
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message(STATUS "Using ccache: ${CCACHE_EXECUTABLE} (version ${CCACHE_VERSION})")
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set(LAUNCHER ${CCACHE_EXECUTABLE})
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# Work around a well-intended but unfortunate behavior of ccache 4.0 & 4.1 with
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# environment variable SOURCE_DATE_EPOCH. This variable provides an alternative
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# to source-code embedded timestamps (__DATE__/__TIME__) and therefore helps with
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# reproducible builds (*). SOURCE_DATE_EPOCH is set automatically by the
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# distribution, e.g. Debian. Ccache 4.0 & 4.1 incorporate SOURCE_DATE_EPOCH into
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# the hash calculation regardless they contain timestamps or not. This invalidates
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# the cache whenever SOURCE_DATE_EPOCH changes. As a fix, ignore SOURCE_DATE_EPOCH.
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#
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# (*) https://reproducible-builds.org/specs/source-date-epoch/
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if (CCACHE_VERSION VERSION_GREATER_EQUAL "4.0" AND CCACHE_VERSION VERSION_LESS "4.2")
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message(STATUS "Ignore SOURCE_DATE_EPOCH for ccache 4.0 / 4.1")
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set(LAUNCHER env -u SOURCE_DATE_EPOCH ${CCACHE_EXECUTABLE})
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endif()
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set (CMAKE_CXX_COMPILER_LAUNCHER ${LAUNCHER} ${CMAKE_CXX_COMPILER_LAUNCHER})
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set (CMAKE_C_COMPILER_LAUNCHER ${LAUNCHER} ${CMAKE_C_COMPILER_LAUNCHER})
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