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3.1.1 Controlling Verbosity

The compiler can be quite verbose in its diagnostic reporting, rather more then some users would prefer – the amount of noise emitted can be controlled, however.

To control emission of compiler diagnostics (of any severity other than error: see Diagnostic Severity) use the sb-ext:muffle-conditions and sb-ext:unmuffle-conditions declarations, specifying the type of condition that is to be muffled (the muffling is done using an associated muffle-warning restart).

Global control:

     ;;; Muffle compiler-notes globally
     (declaim (sb-ext:muffle-conditions sb-ext:compiler-note))

Local control:

     ;;; Muffle compiler-notes based on lexical scope
     (defun foo (x)
       (declare (optimize speed) (fixnum x)
                (sb-ext:muffle-conditions sb-ext:compiler-note))
       (values (* x 5) ; no compiler note from this
           (declare (sb-ext:unmuffle-conditions sb-ext:compiler-note))
           ;; this one gives a compiler note
           (* x -5))))
— Declaration: sb-ext:muffle-conditions

Syntax: type*

Muffles the diagnostic messages that would be caused by compile-time signals of given types.

— Declaration: sb-ext:unmuffle-conditions

Syntax: type*

Cancels the effect of a previous sb-ext:muffle-condition declaration.

Various details of how the compiler messages are printed can be controlled via the alist sb-ext:*compiler-print-variable-alist*.

— Variable: sb-ext:*compiler-print-variable-alist*

an association list describing new bindings for special variables to be used by the compiler for error-reporting, etc. Eg.

           ((*PRINT-LENGTH* . 10) (*PRINT-LEVEL* . 6) (*PRINT-PRETTY* . NIL))

The variables in the car positions are bound to the values in the cdr during the execution of some debug commands. When evaluating arbitrary expressions in the debugger, the normal values of the printer control variables are in effect.

Initially empty, *compiler-print-variable-alist* is Typically used to specify bindings for printer control variables.