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82 lines
2.6 KiB
82 lines
2.6 KiB
# - Compile and run code to check for C++ features
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#
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# This functions compiles a source file under the `cmake` folder
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# and adds the corresponding `HAVE_[FILENAME]` flag to the CMake
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# environment
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#
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# cxx_feature_check(<FLAG> [<VARIANT>])
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#
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# - Example
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#
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# include(CXXFeatureCheck)
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# cxx_feature_check(STD_REGEX)
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# Requires CMake 2.8.12+
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if(__cxx_feature_check)
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return()
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endif()
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set(__cxx_feature_check INCLUDED)
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option(CXXFEATURECHECK_DEBUG OFF)
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function(cxx_feature_check FILE)
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string(TOLOWER ${FILE} FILE)
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string(TOUPPER ${FILE} VAR)
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string(TOUPPER "HAVE_${VAR}" FEATURE)
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if (DEFINED HAVE_${VAR})
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set(HAVE_${VAR} 1 PARENT_SCOPE)
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add_definitions(-DHAVE_${VAR})
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return()
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endif()
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set(FEATURE_CHECK_CMAKE_FLAGS ${BENCHMARK_CXX_LINKER_FLAGS})
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if (ARGC GREATER 1)
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message(STATUS "Enabling additional flags: ${ARGV1}")
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list(APPEND FEATURE_CHECK_CMAKE_FLAGS ${ARGV1})
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endif()
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if (NOT DEFINED COMPILE_${FEATURE})
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if(CMAKE_CROSSCOMPILING)
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message(STATUS "Cross-compiling to test ${FEATURE}")
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try_compile(COMPILE_${FEATURE}
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${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${FILE}.cpp
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CXX_STANDARD 11
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CXX_STANDARD_REQUIRED ON
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CMAKE_FLAGS ${FEATURE_CHECK_CMAKE_FLAGS}
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LINK_LIBRARIES ${BENCHMARK_CXX_LIBRARIES}
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OUTPUT_VARIABLE COMPILE_OUTPUT_VAR)
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if(COMPILE_${FEATURE})
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message(WARNING
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"If you see build failures due to cross compilation, try setting HAVE_${VAR} to 0")
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set(RUN_${FEATURE} 0 CACHE INTERNAL "")
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else()
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set(RUN_${FEATURE} 1 CACHE INTERNAL "")
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endif()
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else()
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message(STATUS "Compiling and running to test ${FEATURE}")
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try_run(RUN_${FEATURE} COMPILE_${FEATURE}
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${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR}/cmake/${FILE}.cpp
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CXX_STANDARD 11
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CXX_STANDARD_REQUIRED ON
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CMAKE_FLAGS ${FEATURE_CHECK_CMAKE_FLAGS}
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LINK_LIBRARIES ${BENCHMARK_CXX_LIBRARIES}
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COMPILE_OUTPUT_VARIABLE COMPILE_OUTPUT_VAR)
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endif()
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endif()
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if(RUN_${FEATURE} EQUAL 0)
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message(STATUS "Performing Test ${FEATURE} -- success")
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set(HAVE_${VAR} 1 PARENT_SCOPE)
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add_definitions(-DHAVE_${VAR})
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else()
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if(NOT COMPILE_${FEATURE})
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if(CXXFEATURECHECK_DEBUG)
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message(STATUS "Performing Test ${FEATURE} -- failed to compile: ${COMPILE_OUTPUT_VAR}")
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else()
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message(STATUS "Performing Test ${FEATURE} -- failed to compile")
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endif()
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else()
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message(STATUS "Performing Test ${FEATURE} -- compiled but failed to run")
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endif()
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endif()
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endfunction()
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