Re: [cclan-list] Two ASDF questions and a possible micro-bug

[Nikodemus S. <nik...@ra...>]

Daniel Weinreb <dl...@al...> writes:

> What is the :weakly-depends-on feature intended to be for?

Consider a system that can use, say, hook into CL-PDF to produces
output if it has been installed, but doesn't need it for basic
operation. :weakly-depends-on can be used to effect just that.

> Is there ever a case where a component has no input files?  The code
> has a conditional that checks for this, but it's hard to see how it
> could ever arise, and perhaps it should signal an exception.

I don't see why it should be required: it doesn't seem a likely source
of problems, and someone may come up with a clever use for it.

> I think I have also spotted a possible bug:
>
> The comments at fwd-or-return-t say that if the file has been deleted,
> we could keep going after the warning.  But fwd-or-return-t would
> return t, which would then be given as an argument to "max", which
> expects to see only numbers.

The T is returned from OPERATION-DONE-P, not FWD-OR-RETURN-T -- see
RETURN-FROM.

Cheers,

  -- Nikodemus              Schemer: "Buddha is small, clean, and serious."
                   Lispnik: "Buddha is big, has hairy armpits, and laughs."