Why do you consider fasl files?

As far as I understand, grovel generates .lisp file first,

and only after that this Lisp code is compiled to .fasl.

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So you could save the generated .lisp file and add it

as any other .lisp file to your ASDF system.

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But note, this might be non-portable. The lisp code

is generated from C includes, which may have different

meaning on different platforms (different sizes of integer,

char and structure types, refer to different functions, etc).

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If you distribute your ASDF system to the same platforms,

you can distribute it together with pre-generated grovel

output. But if you distribute it to different platforms,

the user still may need to run grovel himself.

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Best regards,

- Anton