Re: System compilation failure, CLPPCRE, ASDF, SBCL involved

tim <TimJ@xxxxxxxxxxxx> writes:

On Thu, 28 Feb 2008 10:45:24 -0800, Thomas A. Russ wrote:

COMPILE-FILE also returns three values, with the 2nd and 3rd
corresponding to WARNING-P and FAILURE-P, so this could be what is
triggering the ASDF behavior.


I have noticed that SBCL sometimes returns t in failure-p, even when there
are only warnings and no Error messages, and an output file has been
generated OK. This might explain it.

Interestingly enough, the standard requires FAILURE-P to be T whenver
there are errors or warnings that are not style warnings. So any
warning that isn't a style warning is supposed to set FAILURE-P to T,
even if that is not what one would naively expect.

I suppose the rationale is that if there are non-style warnings, they
may indicate that the code COULD fail to operate correctly and that one
needs to be careful. But if a particular implementation is especially
zealous about producing warnings, then this may cause applications that
were designed with a different understanding of what a warning implies
to conclude that the code is broken.

--
Thomas A. Russ, USC/Information Sciences Institute
.

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