define-foreign-library

Syntax

load-clause ::= (feature { library }*)

Arguments and Values

name

A symbol.

feature

A feature expression.

library

A library designator.

Description

Creates a new library designator called name. The load-clauses describe how to load that designator when passed to load-foreign-library or use-foreign-library.

When trying to load the library name, the relevant function searches the load-clauses in order for the first one where feature evaluates to true. That happens for any of the following situations:¹

1. If feature is a symbol (idiomatically a keyword), a symbol with the same name, but interned into the cffi-features package, is present in common-lisp:*features*.
2. If feature is a list, depending on (first feature), a keyword:

   :and

   All of the feature expressions in (rest feature) are true.
   

   :or

   At least one of the feature expressions in (rest feature) is true.
   

   :not

   The feature expression (second feature) is not true.

3. Finally, if feature is t, this load-clause is picked unconditionally.

Upon finding the first true feature, the library loader then loads each library. The meaning of “library designator” is described in load-foreign-library.

Examples

See Loading foreign libraries.

See Also

load-foreign-library