While working on my new bindings project (using hsc2hs) I came across the __alignof__() statement available in GNU's C compiler. As it turns out, having this computed for me in Storable instances using something like this would be great: instance Storable Foo where .... sizeOf _ = #{const sizeof(CFoo)} alignment _ = #{const __alignof__(CFoo)} .... Can I rely on hsc2hs using GCC? How many people will hate me if I depend on GCC-specific extensions? Legal? Acceptable? Infuriating? /jve