CMakeLua/Source/kwsys/CheckCXXSourceRuns.cmake

   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
  15 MACRO(CHECK_CXX_SOURCE_RUNS SOURCE VAR COMMENT)
  16   IF("HAVE_${VAR}" MATCHES "^HAVE_${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(CMAKE_REQUIRED_LIBRARIES)
  23       SET(CHECK_CXX_SOURCE_COMPILES_ADD_LIBRARIES)
  24     ENDIF(CMAKE_REQUIRED_LIBRARIES)
  25     IF(CMAKE_REQUIRED_INCLUDES)
  26       SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES
  27         "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
  28     ELSE(CMAKE_REQUIRED_INCLUDES)
  29       SET(CHECK_CXX_SOURCE_COMPILES_ADD_INCLUDES)
  30     ENDIF(CMAKE_REQUIRED_INCLUDES)
  31     SET(CMAKE_EMPTY_INPUT_FILE_CONTENT "${SOURCE}")
  32     CONFIGURE_FILE("${CMAKE_CURRENT_SOURCE_DIR}/CMakeEmptyInputFile.in"
  33       "${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/src.cxx" IMMEDIATE)
  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${SOURCE}\n")
  51     ELSE(HAVE_${VAR})
  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${SOURCE}\n")
  58     ENDIF(HAVE_${VAR})
  59   ENDIF("HAVE_${VAR}" MATCHES "^HAVE_${VAR}$")
  60 ENDMACRO(CHECK_CXX_SOURCE_RUNS)
  61
  62