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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.
#
MACRO(CHECK_TYPE_SIZE TYPE VARIABLE)
IF(NOT ${VARIABLE})
SET(MACRO_CHECK_TYPE_SIZE_FLAGS -DCHECK_SIZE_OF="${TYPE}")
IF(HAVE_SYS_TYPES_H)
SET(MACRO_CHECK_TYPE_SIZE_FLAGS
"${MACRO_CHECK_TYPE_SIZE_FLAGS} -DHAVE_SYS_TYPES_H")
ENDIF(HAVE_SYS_TYPES_H)
IF(HAVE_STDINT_H)
SET(MACRO_CHECK_TYPE_SIZE_FLAGS "${MACRO_CHECK_TYPE_SIZE_FLAGS} -DHAVE_STDINT_H")
ENDIF(HAVE_STDINT_H)
MESSAGE(STATUS "Check size of ${TYPE}")
TRY_RUN(${VARIABLE} HAVE_${VARIABLE}
${PROJECT_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckSizeOf.c
CMAKE_FLAGS -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_TYPE_SIZE_FLAGS}
OUTPUT_VARIABLE OUTPUT)
IF(HAVE_${VARIABLE})
MESSAGE(STATUS "Check size of ${TYPE} - done")
ELSE(HAVE_${VARIABLE})
MESSAGE(STATUS "Check size of ${TYPE} - failed")
WRITE_FILE(${PROJECT_BINARY_DIR}/CMakeError.log
"Determining size of ${TYPE} failed with the following output:\n${OUTPUT}\n"
APPEND)
ENDIF(HAVE_${VARIABLE})
ENDIF(NOT ${VARIABLE})
ENDMACRO(CHECK_TYPE_SIZE)
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