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re: in which we present an ugly hack to make sys/queue.h CIRCLEQ work
> } I would be interested in knowing an actual example of the comparison
> } problem with the CIRCLEQ macro, if the concern isn't theoretical. Since
> Uh, do you really think people would be doing all this work
> for something that was theoretical? The problem is that gcc 4.8
> optimises out the comparison as being always false due to the
> anti-alias rule.
correct. CIRCLEQ was broken with GCC 4.8. TAILQ appears fine.
the observations were that nvi(1) would hang while blocking
signals (ie, you had to kill -9 from another window), and
i used tests/lib/libc/db/ to eventually locate the problem.
in these cases, the *INSERT*() macros were never inserting for
the head of the queue, which would cause the iteration macros
to loop forever.
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