1 # This macro attempts to parse the version string of the C compiler in use.
2 # With CMake 2.8.9 CMake provides a CMAKE_[C|CXX]_COMPILER_VERSION variable
3 # so we will use that if available.
5 # Currently supported are:
6 # - with cmake >2.8.8 all compilers supported by CMake
7 # - with cmake <=2.8.8: compilers that accept "-dumpversion" argument:
8 # gcc, Intel Compiler (on Linux and Mac OS), Open64, EkoPath, clang
9 # (and probably other gcc-compatible compilers).
11 # C_COMPILER_VERSION - version string of the current C compiler (CMAKE_C_COMPILER)
12 # CXX_COMPILER_VERSION - version string of the current C++ compiler (CMAKE_CXX_COMPILER)
14 macro(get_compiler_version)
15 if(NOT C_COMPILER_VERSION)
16 set(_cc_dumpversion_res 0)
17 if (DEFINED xCMAKE_C_COMPILER_VERSION AND CMAKE_VERSION VERSION_GREATER 2.8.8)
18 set(_cc_version ${CMAKE_C_COMPILER_VERSION})
20 execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion
21 RESULT_VARIABLE _cc_dumpversion_res
22 OUTPUT_VARIABLE _cc_version
23 OUTPUT_STRIP_TRAILING_WHITESPACE)
26 if (${_cc_dumpversion_res} EQUAL 0)
27 SET(C_COMPILER_VERSION ${_cc_version}
28 CACHE STRING "C compiler version" FORCE)
30 SET(C_COMPILER_VERSION ""
31 CACHE STRING "C compiler version not available" FORCE)
35 if(NOT CXX_COMPILER_VERSION AND CMAKE_CXX_COMPILER_LOADED)
36 set(_cxx_dumpversion_res 0)
37 if (DEFINED CMAKE_CXX_COMPILER_VERSION AND CMAKE_VERSION VERSION_GREATER 2.8.8)
38 set(_cxx_version ${CMAKE_CXX_COMPILER_VERSION})
40 execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion
41 RESULT_VARIABLE _cxx_dumpversion_res
42 OUTPUT_VARIABLE _cxx_version
43 OUTPUT_STRIP_TRAILING_WHITESPACE)
46 if (${_cxx_dumpversion_res} EQUAL 0)
47 SET(CXX_COMPILER_VERSION ${_cxx_version}
48 CACHE STRING "C++ compiler version string" FORCE)
50 SET(CXX_COMPILER_VERSION ""
51 CACHE STRING "C++ compiler version string not available" FORCE)
55 if (NOT "${C_COMPILER_VERSION}" STREQUAL "${CXX_COMPILER_VERSION}" AND CMAKE_CXX_COMPILER_LOADED)
56 message(WARNING "The version of the C and C++ compilers does not match. Note that mixing different C/C++ compilers can cause problems!")
59 mark_as_advanced(C_COMPILER_VERSION CXX_COMPILER_VERSION)
62 # This macro attempts to get a reasonable version string for a compiler,
63 # and also extracts compiler flags.
66 # LANGUAGE - C or CXX, the compiler to check for
67 # BUILD_COMPILER - [output variable] string with compiler path, ID and
68 # some compiler-provided information
69 # BUILD_FLAGS - [output variable] flags for the compiler
71 macro(get_compiler_info LANGUAGE BUILD_COMPILER BUILD_FLAGS)
72 execute_process(COMMAND ${CMAKE_${LANGUAGE}_COMPILER} --version
73 RESULT_VARIABLE _exec_result
74 OUTPUT_VARIABLE _compiler_version
75 ERROR_VARIABLE _compiler_version)
76 # Try executing just the compiler command --version failed
78 execute_process(COMMAND ${CMAKE_${LANGUAGE}_COMPILER}
79 RESULT_VARIABLE _exec_result
80 OUTPUT_VARIABLE _compiler_version
81 ERROR_VARIABLE _compiler_version)
83 if(NOT "${_compiler_version}" STREQUAL "")
84 string(REGEX MATCH "[^\n]+" _compiler_version "${_compiler_version}")
88 "${CMAKE_${LANGUAGE}_COMPILER} ${CMAKE_${LANGUAGE}_COMPILER_ID} ${_compiler_version}")
89 set(_build_flags "${CMAKE_${LANGUAGE}_FLAGS}")
90 string(TOUPPER ${CMAKE_BUILD_TYPE} _build_type)
91 set(_build_flags "${_build_flags} ${CMAKE_${LANGUAGE}_FLAGS_${_build_type}}")
92 set(${BUILD_FLAGS} ${_build_flags})