DATA_ALIGNMENT vs. DECL_USER_ALIGNMENT

[Richard Kenner]

    So if you turn:

    T i __attribute__((align(2)));
    T j __attribute__((align(2)));

    into

    typedef T T2 __attribute__((align(2)));
    T2 i, j;

    you say we could get different code?  

I say so, yes.

And the reason is as I said: you specify alignment for a type both for
interface and efficiency reasons, but for an object only for the latter.
So there is a difference in meaning between these two constructs.