[Haskell-cafe] Begginer question about alignment in Storable

Hi, I need to make the following structure into an instance of Storable: struct { double w[2]; } Can I assume that its function 'alignment' should return the same as "alignment (1::CDouble)"? Or should it be "2 * alignment (1::CDouble)"? (I've read the wikipedia article about memory alignment, and what I understand is that there's a better alignment for hardware efficiency but compilers and programmers can do almost anything about it. What can I do when writing a library wrapper if I don't know what kind of compiler pragmas were used in all platforms that library was compiled?) Thanks, Maurício