OK. I think I'm misled by a typo in the help of ext_charize_microsoft diag which type #@ as @#. But I can comiple the same file with MSVC. Is @# really another Microsoft extension that is not implemented yet as Nico said ? Many thanks 2012/7/20 Sebastian Redl <sebastian.redl at getdesigned.at>: > #@ is a microsoft extension: it's the charize operator: