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#
# Check if the type exists and determine size of type. if the type
# exists, the size will be stored to the variable.
#
# CHECK_TYPE_SIZE - macro which checks the size of type
# VARIABLE - variable to store size if the type exists.
# HAVE_${VARIABLE} - does the variable exists or not
#
MACRO(CHECK_TYPE_SIZE TYPE VARIABLE)
SET(CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS 1)
IF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
SET(MACRO_CHECK_TYPE_SIZE_FLAGS
"-DCHECK_TYPE_SIZE_TYPE=\"${TYPE}\" ${CMAKE_REQUIRED_FLAGS}")
FOREACH(def HAVE_SYS_TYPES_H HAVE_STDINT_H HAVE_STDDEF_H)
IF("${def}")
SET(MACRO_CHECK_TYPE_SIZE_FLAGS
"${MACRO_CHECK_TYPE_SIZE_FLAGS} -D${def}")
ENDIF("${def}")
ENDFOREACH(def)
MESSAGE(STATUS "Check size of ${TYPE}")
IF(CMAKE_REQUIRED_LIBRARIES)
SET(CHECK_TYPE_SIZE_ADD_LIBRARIES
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES}")
ENDIF(CMAKE_REQUIRED_LIBRARIES)
TRY_RUN(${VARIABLE} HAVE_${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckTypeSize.c
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_TYPE_SIZE_FLAGS}
"${CHECK_TYPE_SIZE_ADD_LIBRARIES}"
OUTPUT_VARIABLE OUTPUT)
IF(HAVE_${VARIABLE})
MESSAGE(STATUS "Check size of ${TYPE} - done")
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeOutput.log
"Determining size of ${TYPE} passed with the following output:\n${OUTPUT}\n\n")
ELSE(HAVE_${VARIABLE})
MESSAGE(STATUS "Check size of ${TYPE} - failed")
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeError.log
"Determining size of ${TYPE} failed with the following output:\n${OUTPUT}\n\n")
ENDIF(HAVE_${VARIABLE})
ENDIF("HAVE_${VARIABLE}" MATCHES "^HAVE_${VARIABLE}$")
SET(CMAKE_ALLOW_UNKNOWN_VARIABLE_READ_ACCESS )
ENDMACRO(CHECK_TYPE_SIZE)
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