On 19 Nov, 2014, at 01:54 , Taylor R Campbell
<campbell+netbsd-tech-k...@mumble.net> wrote:
> Date: Wed, 19 Nov 2014 00:05:05 +0800
> From: Dennis Ferguson <dennis.c.fergu...@gmail.com>
>
> Also, the TAILQ macros depend on a type pun fairly similar to the one
> that did in the CIRCLEQ macros and hence have a lifetime which extends
> only to some future version of the compiler smart enough to recognize
> that and miscompile them.
>
> What type pun is that? I don't see it.
I think this one:
#define TAILQ_LAST(head, headname) \
(*(((struct headname *)((head)->tqh_last))->tqh_last))
#define TAILQ_PREV(elm, headname, field) \
(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))
The (struct headname *) pointer it is obtaining by the cast is
sometimes being used to access data in something other than
a 'struct headname'.
Dennis Ferguson
