MPLAB C Compiler for PIC24 MCUs and dsPIC DSCs ... - Microchip

16-Bit C Compiler User’s Guide
TABLE 3-5: WARNING/ERROR OPTIONS IMPLIED BY -WALL (CONTINUED)
Option Definition
-Wunused-parameter Warn whenever a function parameter is unused aside from its
declaration. To suppress this warning, use the unused
attribute (see Section 2.3.1 “Specifying Attributes of
Variables”).
-Wunused-variable Warn whenever a local variable or non-constant static
variable is unused aside from its declaration. To suppress this
warning, use the unused attribute (see
Section 2.3.1 “Specifying Attributes of Variables”).
-Wunused-value Warn whenever a statement computes a result that is
explicitly not used. To suppress this warning, cast the
expression to void.
The following -W options are not implied by -Wall. Some of them warn about constructions
that users generally do not consider questionable, but which occasionally you
might wish to check for. Others warn about constructions that are necessary or hard to
avoid in some cases, and there is no simple way to modify the code to suppress the
warning.
DS51284H-page 42 © 2008 Microchip Technology Inc.