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How do I activate #pragma pack on ubuntu 10.4 gcc 4.4.3

I am trying to activate #pragma pack(push, 8) on ubuntu 10.4 (8.10 would also be nice), which uses gcc 4.4.3, but I can't get it to work. Is there something more that need to be done?

There is not even a warning if I compile with -Wunknown-pragmas so gcc seems at least to acknowledge it as a known pragma.

It would be nice to use the packpragma as it could pack several structs in a go while the gcc prefered method with __attribute__((aligned(8))) is pretty messy to handle...(or is there something I'm missing?)

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