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  • with-compilation-unit (⟦option⟧) form*result*

option ::= :override override

Arguments and Values


Executes forms from left to right. Within the dynamic environment of with-compilation-unit, actions deferred by the compiler until the end of compilation will be deferred until the end of the outermost call to with-compilation-unit.

The set of options permitted may be extended by the implementation, but the only standardized keyword is :override.

If nested dynamically only the outer call to with-compilation-unit has any effect unless the value associated with :override is true, in which case warnings are deferred only to the end of the innermost call for which override is true.

The function compile-file provides the effect of (with-compilation-unit (:override nil) ...)' around its code.

Any implementation-dependent extensions can only be provided as the result of an explicit programmer request by use of an implementation-dependent keyword. Implementations are forbidden from attaching additional meaning to a use of this macro which involves either no keywords or just the keyword :override.


If an implementation would normally defer certain kinds of warnings, such as warnings about undefined functions, to the end of a compilation unit (such as a file), the following example shows how to cause those warnings to be deferred to the end of the compilation of several files.

(defun compile-files (&rest files) (with-compilation-unit () (mapcar #'(lambda (file) (compile-file file)) files)))


(compile-files "A" "B" "C")


Note however that if the implementation does not normally defer any warnings, use of with-compilation-unit might not have any effect.

Affected By


Exceptional Situations


See Also