# Ensures that we do an out of source build MACRO(MACRO_ENSURE_OUT_OF_SOURCE_BUILD MSG) STRING(COMPARE EQUAL "${CMAKE_SOURCE_DIR}" "${CMAKE_BINARY_DIR}" insource) GET_FILENAME_COMPONENT(PARENTDIR ${CMAKE_SOURCE_DIR} PATH) STRING(COMPARE EQUAL "${CMAKE_SOURCE_DIR}" "${PARENTDIR}" insourcesubdir) IF(insource OR insourcesubdir) MESSAGE(FATAL_ERROR "${MSG}") ENDIF(insource OR insourcesubdir) ENDMACRO(MACRO_ENSURE_OUT_OF_SOURCE_BUILD)