Modules/CheckTypeSize.cmake

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