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Language Specifics
The following -W options are not implied by -Wall . Some of them warn about
constructions that users generally do not consider questionable, but which you might
occasionally 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.
TABLE 1-6:
WARNING AND ERROR OPTIONS NOT IMPLIED BY
-WALL
Option
-W
-Waggregate-return
-Wbad-function-cast
? 2007 Microchip Technology Inc.
Definition
Print extra warning messages for these events:
? A nonvolatile automatic variable might be changed by a
call to longjmp . These warnings are possible only in
optimizing compilation. The compiler sees only the calls
to setjmp . It cannot know where longjmp will be called.
In fact, a signal handler could call it at any point in the
code. As a result, a warning may be generated even
when there is in fact no problem, because longjmp
cannot in fact be called at the place that would cause a
problem.
? A function could exit both via return value; and
return; . Completing the function body without passing
any return statement is treated as return; .
? An expression-statement or the left-hand side of a
comma expression contains no side effects. To suppress
the warning, cast the unused expression to void. For
example, an expression such as x[i,j] causes a
warning, but x[(void)i,j] does not.
? An unsigned value is compared against zero with < or <= .
? A comparison like x<=y<=z appears, This is equivalent
to (x<=y ? 1 : 0) <= z , which is a different
interpretation from that of ordinary mathematical notation.
? Storage-class specifiers like static are not the first
things in a declaration. According to the C Standard, this
usage is obsolescent.
? If -Wall or -Wunused is also specified, warn about
unused arguments.
? A comparison between signed and unsigned values could
produce an incorrect result when the signed value is
converted to unsigned. (But don’t warn if
-Wno-sign-compare is also specified.)
? An aggregate has a partly bracketed initializer. For
example, the following code would evoke such a warning,
because braces are missing around the initializer for
x.h:
struct s { int f, g; };
struct t { struct s h; int i; };
struct t x = { 1, 2, 3 };
? An aggregate has an initializer that does not initialize all
members. For example, the following code would cause
such a warning, because x.h would be implicitly
initialized to zero:
struct s { int f, g, h; };
struct s x = { 3, 4 };
Warn if any functions that return structures or unions are
defined or called.
Warn whenever a function call is cast to a non-matching type.
For example, warn if int foof() is cast to anything * .
DS51686A-page 23
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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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