On Sat, 2007-05-19 at 14:24 +0200, Segher Boessenkool wrote:
> >> It's not the compiler who decides -- struct layout is
> >> dictated by the ABI you're compiling for.
> >
> > This is true in the case of externally-visible stuff. I think the
> > compiler is permitted to violate the ABI for purely unit-internal
> > things
> > if it makes sense though, isn't it?
>
> Sure. It isn't "violating the ABI" in that case though,
> to be perfectly clear.
Of course. It's not conforming to the ABI because there's no need to.
> > The rule stands -- empirical testing of what the compiler will do isn't
> > usually the right answer.
>
> It is *never* the right answer. You should always write
> your code so that it will do the right thing no matter
> what the compiler decides to do to it.
Well, there's sometimes some benefit in _also_ checking that the output
of the compiler matches your expectations. :)
--
dwmw2
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