with-compilation-unit

ToC

Allegro CL

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.