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35 # Reference https://crascit.com/2016/04/09/using-ccache-with-cmake/
37 # Here we try to make sure that ccache is invoked as `/.../ccache compiler args` to best handle more than one local
38 # compiler or a compiler wrapper, whereas it is otherwise common to replace the default compilers with symbolic links
39 # to the ccache binary.
41 # ccache only works for gcc compatible compilers. We should test with anything other than CMAKE_<LANG>_COMPILER_ID==GNU
42 # Clang is reported to work with some caveats. See https://pspdfkit.com/blog/2015/ccache-for-fun-and-profit/
43 find_program(CCACHE_PROGRAM ccache)
45 # Check whether C compiler wrapper has been set up.
46 if(NOT DEFINED GMX_CACHE_C_COMPILER)
47 # Determine whether we have a cacheable compiler.
49 if (CMAKE_C_COMPILER_ID MATCHES "GNU"
50 OR CMAKE_C_COMPILER_ID MATCHES "AppleClang"
51 OR CMAKE_C_COMPILER_ID MATCHES "Clang")
52 message(STATUS "Setting up ccache wrapper for ${CMAKE_C_COMPILER_ID} C compiler ${CMAKE_C_COMPILER}")
53 set(_c_launcher "${CCACHE_PROGRAM}")
54 configure_file(launch-c.in ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/launch-c)
56 file(COPY ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/launch-c
57 DESTINATION ${CMAKE_BINARY_DIR}
59 OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
63 message(STATUS "Disabling ccache set up. Not confirmed to work with compiler ID ${CMAKE_C_COMPILER_ID}.")
64 endif() # GNU C compiler
65 set(GMX_CACHE_C_COMPILER ${_cacheable} CACHE INTERNAL "Whether the C compiler will be wrapped for caching.")
68 # Check whether we should use the wrapper. If so, set CMAKE variables.
69 if(GMX_CACHE_C_COMPILER)
70 if(CMAKE_GENERATOR STREQUAL "Xcode")
71 # Set Xcode project attributes to route compilation and linking
73 set(CMAKE_XCODE_ATTRIBUTE_CC "${CMAKE_BINARY_DIR}/launch-c")
74 set(CMAKE_XCODE_ATTRIBUTE_LD "${CMAKE_BINARY_DIR}/launch-c")
76 # Support Unix Makefiles and Ninja
77 set(CMAKE_C_COMPILER_LAUNCHER "${CMAKE_BINARY_DIR}/launch-c")
79 endif(GMX_CACHE_C_COMPILER)
81 # Check whether CXX compiler wrapper has been set up
82 if(NOT DEFINED GMX_CACHE_CXX_COMPILER)
83 # Determine whether we have a cacheable compiler.
85 if (CMAKE_CXX_COMPILER_ID MATCHES "GNU"
86 OR CMAKE_CXX_COMPILER_ID MATCHES "AppleClang"
87 OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
88 message(STATUS "Setting up ccache wrapper for ${CMAKE_CXX_COMPILER_ID} CXX compiler ${CMAKE_CXX_COMPILER}")
89 set(_cxx_launcher "${CCACHE_PROGRAM}")
90 configure_file(launch-cxx.in ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/launch-cxx)
92 file(COPY ${CMAKE_CURRENT_BINARY_DIR}/CMakeFiles/launch-cxx
93 DESTINATION ${CMAKE_BINARY_DIR}
95 OWNER_READ OWNER_WRITE OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_READ WORLD_EXECUTE
99 message(STATUS "Skipping ccache set up. Not confirmed to work with compiler ID ${CMAKE_CXX_COMPILER_ID}.")
100 endif() # GNU C++ compiler
101 set(GMX_CACHE_CXX_COMPILER ${_cacheable} CACHE INTERNAL "Whether the C++ compiler will be wrapped for caching.")
104 # Check whether we should use the wrapper. If so, set CMAKE variables.
105 if(GMX_CACHE_CXX_COMPILER)
106 if(CMAKE_GENERATOR STREQUAL "Xcode")
107 # Set Xcode project attributes to route compilation and linking
108 # through our scripts
109 set(CMAKE_XCODE_ATTRIBUTE_CXX "${CMAKE_BINARY_DIR}/launch-cxx")
110 set(CMAKE_XCODE_ATTRIBUTE_LDPLUSPLUS "${CMAKE_BINARY_DIR}/launch-cxx")
112 # Support Unix Makefiles and Ninja
113 set(CMAKE_CXX_COMPILER_LAUNCHER "${CMAKE_BINARY_DIR}/launch-cxx")
115 endif(GMX_CACHE_CXX_COMPILER)
116 endif(CCACHE_PROGRAM) # ccache program