SW006015【PDF 29/120 页】C COMPILER MPLAB C32

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Language Specifics

TABLE 1-6:

WARNING AND ERROR OPTIONS NOT IMPLIED BY

-WALL (CONTINUED)

Option

-Wredundant-decls

-Wshadow

-Wsign-compare

-Wno-sign-compare

-Wstrict-prototypes

-Wtraditional

-Wundef

-Wunreachable-code

-Wwrite-strings

? 2007 Microchip Technology Inc.

Definition

Warn if anything is declared more than once in the same

scope, even in cases where multiple declaration is valid and

changes nothing.

Warn whenever a local variable shadows another local

variable.

Warn when a comparison between signed and unsigned

values could produce an incorrect result when the signed

value is converted to unsigned. This warning is also enabled

by -W . To get the other warnings of -W without this warning,

use -W -Wno-sign-compare .

Warn if a function is declared or defined without specifying the

argument types. (An old-style function definition is permitted

without a warning if preceded by a declaration which specifies

the argument types.)

Warn about certain constructs that behave differently in

traditional and ANSI C.

? Macro arguments occurring within string constants in the

macro body. These would substitute the argument in

traditional C, but are part of the constant in ANSI C.

? A function declared external in one block and then used

after the end of the block.

? A switch statement has an operand of type long .

? A nonstatic function declaration follows a static one. This

construct is not accepted by some traditional C compilers.

Warn if an undefined identifier is evaluated in an #if

directive.

Warn if the compiler detects that code will never be executed.

It is possible for this option to produce a warning even though

there are circumstances under which part of the affected line

can be executed, so care should be taken when removing

apparently-unreachable code. For instance, when a function is

inlined, a warning may mean that the line is unreachable in

only one inlined copy of the function.

Give string constants the type const char[length] so that

copying the address of one into a non-const char * pointer

gets a warning. At compile time, these warnings help you find

code that you can try to write into a string constant, but only if

you have been very careful about using const in declarations

and prototypes. Otherwise, it’s just a nuisance, which is why

-Wall does not request these warnings.

DS51686A-page 25

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