1# - Check if the source code provided in the SOURCE argument compiles. 2# CHECK_CXX_SOURCE_COMPILES(SOURCE VAR) 3# - macro which checks if the source code compiles\ 4# SOURCE - source code to try to compile 5# VAR - variable to store size if the type exists. 6# 7# The following variables may be set before calling this macro to 8# modify the way the check is run: 9# 10# CMAKE_REQUIRED_FLAGS = string of compile command line flags 11# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) 12# CMAKE_REQUIRED_INCLUDES = list of include directories 13# CMAKE_REQUIRED_LIBRARIES = list of libraries to link 14 15MACRO(CHECK_CXX_SOURCE_RUNS SOURCE VAR COMMENT) 16 IF(NOT DEFINED "HAVE_${VAR}") 17 SET(MACRO_CHECK_FUNCTION_DEFINITIONS 18 "-D${VAR} ${CMAKE_REQUIRED_FLAGS}") 19 IF(CMAKE_REQUIRED_LIBRARIES) 20 SET(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES 21 "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}") 22 ELSE() 23 SET(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES) 24 ENDIF() 25 IF(CMAKE_REQUIRED_INCLUDES) 26 SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES 27 "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}") 28 ELSE() 29 SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES) 30 ENDIF() 31 SET(CMAKE_EMPTY_INPUT_FILE_CONTENT "${SOURCE}") 32 CONFIGURE_FILE("${VTK_SOURCE_DIR}/CMake/CMakeEmptyInputFile.in" 33 "${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/src.cxx") 34 35 MESSAGE(STATUS "Performing Test ${COMMENT}") 36 TRY_RUN(${VAR} HAVE_${VAR} 37 ${CMAKE_BINARY_DIR} 38 ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/src.cxx 39 COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} 40 CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS} 41 "${CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES}" 42 "${CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES}" 43 OUTPUT_VARIABLE OUTPUT) 44 IF(HAVE_${VAR}) 45 SET(${VAR} 1 CACHE INTERNAL "Test ${COMMENT}") 46 MESSAGE(STATUS "Performing Test ${COMMENT} - Success") 47 FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log 48 "Performing C++ SOURCE FILE Test ${COMMENT} succeded with the following output:\n" 49 "${OUTPUT}\n" 50 "Source file was:\n${SOURCE}\n") 51 ELSE() 52 MESSAGE(STATUS "Performing Test ${COMMENT} - Failed") 53 SET(${VAR} "" CACHE INTERNAL "Test ${COMMENT}") 54 FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log 55 "Performing C++ SOURCE FILE Test ${COMMENT} failed with the following output:\n" 56 "${OUTPUT}\n" 57 "Source file was:\n${SOURCE}\n") 58 ENDIF() 59 ENDIF() 60ENDMACRO() 61 62 63