[asdf-devel] Two questions

[Faré]

2009/9/30 Nick Levine <ndl at ravenbrook.com>:
> 1. Problems with the :feature feature.
>
> (asdf:defsystem foo
>  :components ((:file "pkg")
>               (:file "code")
>               (:file "foo" :depends-on ((:feature :frob)))))
>
> If :frob is not on *features*, load-system gives me:
>
>  Error: Bad dependency (FEATURE FROB).  Dependencies must be
>  (:version <version>), (:feature <feature>), or a name
>
> If :frob is a *feature* I get a different error:
>
>  Error: Error component :FROB not found, required by #<CL-SOURCE-FILE
>  "foo" #x8B7A3E6>
>
> Did I misunderstand something?
>
Maybe what you want is #+frob (:file "foo")

> 2. Suppose I would like some code to run at compile-time / load-time
> to determine where the fasls should live (e.g. hypothetically, in a
> subdirectory named after a timestamp, or according to what patches I
> have loaded). How do I express this?
>
You can define your own :around method on output-files, and/or
override default methods. See how ASDF-BINARY-LOCATIONS (now part of
ASDF 1.366 and later) does it.

Note that with XCVB, you can :depends-on (:when (:featurep :frob)
"foo") and you can xcvb --object-directory obj-$(timestamp) ...

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