Thread: Strange struct padding?

I understand that the standard doesn't specify padding etc etc, but this is a "real world" question.

I have a struct

Code:

struct S {
        long long int a;
        int b;
        int c;
        char d;
        char e;
};

and I expect its size to be 18 bytes, since no padding is needed (ints already aligned to 4-bytes boundaries, and chars don't matter).

But gcc 4.2.3 on x86-64 Linux gives me a size of 24. How does that work?

*edit* is it so that if I stack them up in an array, the long long member will be aligned to 8-bytes boundaries? */edit*