src/cmake/CheckCSourceCompiles.cmake

   1 # - Check if the source code provided in the SOURCE argument compiles.
   2
   3 # modified version from cmake distribution
   4 # added link directory settings
   5
   6
   7 # CHECK_C_SOURCE_COMPILES(SOURCE VAR)
   8 # - macro which checks if the source code compiles
   9 #  SOURCE   - source code to try to compile
  10 #  VAR      - variable to store whether the source code compiled
  11 #
  12 # The following variables may be set before calling this macro to
  13 # modify the way the check is run:
  14 #
  15 #  CMAKE_REQUIRED_FLAGS = string of compile command line flags
  16 #  CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
  17 #  CMAKE_REQUIRED_INCLUDES = list of include directories
  18 #  CMAKE_REQUIRED_LIBRARIES = list of libraries to link
  19 #  CMAKE_REQUIRED_LIBDIRS  = list of libraries directories for linking
  20
  21 MACRO(CHECK_C_SOURCE_COMPILES SOURCE VAR)
  22   IF("${VAR}" MATCHES "^${VAR}$")
  23     SET(MACRO_CHECK_FUNCTION_DEFINITIONS
  24       "-D${VAR} ${CMAKE_REQUIRED_FLAGS}")
  25     IF(CMAKE_REQUIRED_LIBRARIES)
  26       SET(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES
  27         "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
  28     ELSE(CMAKE_REQUIRED_LIBRARIES)
  29       SET(CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES)
  30     ENDIF(CMAKE_REQUIRED_LIBRARIES)
  31     IF(CMAKE_REQUIRED_LIBDIRS)
  32       SET(CHECK_C_SOURCE_COMPILES_ADD_LIBDIRS
  33         "-DLINK_DIRECTORIES:STRING=${CMAKE_REQUIRED_LIBDIRS}")
  34     ELSE(CMAKE_REQUIRED_LIBDIRS)
  35       SET(CHECK_C_SOURCE_COMPILES_ADD_LIBDIRS)
  36     ENDIF(CMAKE_REQUIRED_LIBDIRS)
  37     IF(CMAKE_REQUIRED_INCLUDES)
  38       SET(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES
  39         "-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}")
  40     ELSE(CMAKE_REQUIRED_INCLUDES)
  41       SET(CHECK_C_SOURCE_COMPILES_ADD_INCLUDES)
  42     ENDIF(CMAKE_REQUIRED_INCLUDES)
  43     FILE(WRITE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c"
  44       "${SOURCE}\n")
  45
  46     MESSAGE(STATUS "Performing Test ${VAR}")
  47     TRY_COMPILE(${VAR}
  48       ${CMAKE_BINARY_DIR}
  49       ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/src.c
  50       COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
  51       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_FUNCTION_DEFINITIONS}
  52       "${CHECK_C_SOURCE_COMPILES_ADD_LIBRARIES}"
  53       "${CHECK_C_SOURCE_COMPILES_ADD_INCLUDES}"
  54       "${CHECK_C_SOURCE_COMPILES_ADD_LIBDIRS}"
  55       OUTPUT_VARIABLE OUTPUT)
  56     IF(${VAR})
  57       SET(${VAR} 1 CACHE INTERNAL "Test ${VAR}")
  58       MESSAGE(STATUS "Performing Test ${VAR} - Success")
  59       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  60         "Performing C SOURCE FILE Test ${VAR} succeded with the following output:\n"
  61         "${OUTPUT}\n"
  62         "Source file was:\n${SOURCE}\n")
  63     ELSE(${VAR})
  64       MESSAGE(STATUS "Performing Test ${VAR} - Failed")
  65       SET(${VAR} "" CACHE INTERNAL "Test ${VAR}")
  66       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  67         "Performing C SOURCE FILE Test ${VAR} failed with the following output:\n"
  68         "${OUTPUT}\n"
  69         "Source file was:\n${SOURCE}\n")
  70     ENDIF(${VAR})
  71   ENDIF("${VAR}" MATCHES "^${VAR}$")
  72 ENDMACRO(CHECK_C_SOURCE_COMPILES)
  73