CMake/CheckTypeSize.cmake

   1 # - Check sizeof a type
   2 #  CHECK_TYPE_SIZE(TYPE VARIABLE)
   3 # Check if the type exists and determine size of type.  if the type
   4 # exists, the size will be stored to the variable.
   5 #
   6 #  VARIABLE - variable to store size if the type exists.
   7 #  HAVE_${VARIABLE} - does the variable exists or not
   8
   9 MACRO(CHECK_TYPE_SIZE TYPE VARIABLE)
  10   SET(CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS 1)
  11   IF(NOT DEFINED ${VARIABLE})
  12   IF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
  13     SET(CHECK_TYPE_SIZE_TYPE "${TYPE}")
  14     SET(MACRO_CHECK_TYPE_SIZE_FLAGS
  15       "${CMAKE_REQUIRED_FLAGS}")
  16     FOREACH(def HAVE_SYS_TYPES_H HAVE_STDINT_H HAVE_STDDEF_H)
  17       IF("${def}")
  18         SET(MACRO_CHECK_TYPE_SIZE_FLAGS
  19           "${MACRO_CHECK_TYPE_SIZE_FLAGS} -D${def}")
  20       ENDIF("${def}")
  21     ENDFOREACH(def)
  22     SET(CHECK_TYPE_SIZE_PREMAIN)
  23     FOREACH(def ${CMAKE_EXTRA_INCLUDE_FILES})
  24       SET(CHECK_TYPE_SIZE_PREMAIN "${CHECK_TYPE_SIZE_PREMAIN}#include \"${def}\"\n")
  25     ENDFOREACH(def)
  26     CONFIGURE_FILE(
  27       "${CMAKE_CURRENT_SOURCE_DIR}/CMake/CheckTypeSize.c.in"
  28       "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckTypeSize.c"
  29       IMMEDIATE @ONLY)
  30     FILE(READ
  31       "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckTypeSize.c"
  32       CHECK_TYPE_SIZE_FILE_CONTENT)
  33     MESSAGE(STATUS "Check size of ${TYPE}")
  34     IF(CMAKE_REQUIRED_LIBRARIES)
  35       SET(CHECK_TYPE_SIZE_ADD_LIBRARIES
  36         "-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
  37     ENDIF(CMAKE_REQUIRED_LIBRARIES)
  38     TRY_RUN(${VARIABLE} HAVE_${VARIABLE}
  39       ${CMAKE_BINARY_DIR}
  40       "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckTypeSize.c"
  41       CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_TYPE_SIZE_FLAGS}
  42       "${CHECK_TYPE_SIZE_ADD_LIBRARIES}"
  43       OUTPUT_VARIABLE OUTPUT)
  44     IF(HAVE_${VARIABLE})
  45       MESSAGE(STATUS "Check size of ${TYPE} - done")
  46       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  47         "Determining size of ${TYPE} passed with the following output:\n${OUTPUT}\n\n")
  48     ELSE(HAVE_${VARIABLE})
  49       MESSAGE(STATUS "Check size of ${TYPE} - failed")
  50       FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  51         "Determining size of ${TYPE} failed with the following output:\n${OUTPUT}\nCheckTypeSize.c:\n${CHECK_TYPE_SIZE_FILE_CONTENT}\n\n")
  52     ENDIF(HAVE_${VARIABLE})
  53   ENDIF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
  54   ENDIF(NOT DEFINED ${VARIABLE})
  55   SET(CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS )
  56 ENDMACRO(CHECK_TYPE_SIZE)