Re: ASDF: alternative system configurations

james anderson <[email protected]> writes:

> not the original question, but take a situation where i have four system
> components a,b,c,d and for the purposes of compiling the system the depandancy is
>
>        a
>       / \
>       b c
>       \ /
>        d
>
> which means that the builder needs to specify either a and b, or a and c to
> build. on the other hand, when it comes to documenting or releasing, one would
> like to specify a and b and c and not have to worry about what
> conditionalization has done to the effective expression of the system structure.

Again, a late response; I've only just begun pushing the boundaries of
"normal" asdf use; (untested):

(defsystem foo
  :components 
  ((:file "a")
   (:module "bar"
      :depends-on "a"
      :components
      ((:file "b" :in-order-to (compile-op (feature :use-b)))
       (:file "c" :in-order-to (compile-op (feature :use-c))))
      :if-component-dep-fails :try-next)
   (:file "d" :depends-on "bar")))

And I think you can probably play the same trick as in my mail to
Nikodemus with subclassing asdf:cl-source-file and an :around method
to avoid the (ab)use of *FEATURES*.

Cheers,

Christophe

[ PS: James, your mail system appears not to talk to mine; I don't
  know why.  On the assumption that it talks to sourceforge, just to
  let you know that I've had reasonable success in compiling cl-xml
  under released versions of sbcl; not having any application for it,
  though, I'm at a bit of a loss as to how to test it. ]
-- 
http://www-jcsu.jesus.cam.ac.uk/~csr21/       +44 1223 510 299/+44 7729 383 757
(set-pprint-dispatch 'number (lambda (s o) (declare (special b)) (format s b)))
(defvar b "~&Just another Lisp hacker~%")    (pprint #36rJesusCollegeCambridge)


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