:FEATURE dependency-def

[Faré]

On Tue, May 17, 2016 at 9:39 AM, Didier Verna <didier at lrde.epita.fr> wrote:
> Stelian Ionescu wrote:
>
>> #-feature
>> (error "FEATURE missing")
>>
>> at toplevel, so you get an error on reading the .asd file.
>
>   Of course. I said a "declarative way" within the system itself tho ;-)
>
I strongly recommend against erroring in the .asd file itself based on
the implementation, because that hinders cross-compilation.

The traditional solution is to load a file that fails.
i.e. create a file unsupported-implementation.lisp that
has an (error ...) form and in your asd file, use a component
(:file "unsupported-implementation" :if-feature (:not :sbcl))

And yes, I probably should have called it :when-feature instead of
:if-feature. My bad. If you think that's worth it, we can add the new
name now and remove the old name in 2 years.

PS: Robert, I pushed a tiny tweak to the documentation.

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