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Language Specifics
TABLE 1-5:
WARNING AND ERROR OPTIONS IMPLIED BY
-WALL (CONTINUED)
Option
-Wswitch
-Wsystem-headers
-Wtrigraphs
-Wuninitialized
-Wunknown-pragmas
-Wunused
-Wunused-function
-Wunused-label
? 2007 Microchip Technology Inc.
Definition
Warn whenever a switch statement has an index of
enumeral type and lacks a case for one or more of the named
codes of that enumeration. (The presence of a default label
prevents this warning.) case labels outside the enumeration
range also provoke warnings when this option is used.
Print warning messages for constructs found in system
header files. Warnings from system headers are normally
suppressed, on the assumption that they usually do not
indicate real problems and would only make the compiler
output harder to read. Using this command line option tells
MPLAB C32 C compiler to emit warnings from system
headers as if they occurred in user code. However, note that
using -Wall in conjunction with this option does not warn
about unknown pragmas in system headers. For that,
-Wunknown-pragmas must also be used.
Warn if any trigraphs are encountered (assuming they are
enabled).
Warn if an automatic variable is used without first being
initialized.
These warnings are possible only when optimization is
enabled, because they require data flow information that is
computed only when optimizing.
These warnings occur only for variables that are candidates
for register allocation. Therefore, they do not occur for a
variable that is declared volatile , or whose address is
taken, or whose size is other than 1, 2, 4 or 8 bytes. Also,
they do not occur for structures, unions or arrays, even when
they are in registers.
Note that there may be no warning about a variable that is
used only to compute a value that itself is never used,
because such computations may be deleted by data flow
analysis before the warnings are printed.
Warn when a #pragma directive is encountered which is not
understood by MPLAB C32 C compiler. If this command line
option is used, warnings are even be issued for unknown
pragmas in system header files. This is not the case if the
warnings were only enabled by the -Wall command line
option.
Warn whenever a variable is unused aside from its
declaration, whenever a function is declared static but never
defined, whenever a label is declared but not used, and
whenever a statement computes a result that is explicitly not
used.
In order to get a warning about an unused function
parameter, both -W and -Wunused must be specified.
Casting an expression to void suppresses this warning for an
expression. Similarly, the unused attribute suppresses this
warning for unused variables, parameters and labels.
Warn whenever a static function is declared but not defined
or a non-inline static function is unused.
Warn whenever a label is declared but not used. To suppress
this warning, use the unused attribute.
DS51686A-page 21
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相关PDF资料
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
SY87729LHI-EVAL
BOARD EVAL N SY87729 EXPERIMENT
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