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| ANSI Common Lisp 24 System Construction 24.2 Dictionary of System Construction
24.2.4 with-compilation-unit | Macro
  Syntax: with-compilation-unit ([[option]]) {form}* {result}* option::= `:override` override Arguments and Values: override - a generalized boolean; evaluated. The default is nil. forms - an implicit progn. results - the values returned by the forms. Description: 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`. Examples: 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. See Also: compile, compile-file Allegro CL Implementation Details: None.

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