SW006015【PDF 28/120 页】C COMPILER MPLAB C32

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MPLAB ? C32 C Compiler User’s Guide

TABLE 1-6:

WARNING AND ERROR OPTIONS NOT IMPLIED BY

-WALL (CONTINUED)

Option

-Wcast-align

-Wcast-qual

-Wconversion

-Werror

-Winline

-Wlarger-than- len

-Wlong-long

-Wno-long-long

Definition

Warn whenever a pointer is cast, such that the required

alignment of the target is increased. For example, warn if a

char * is cast to an int * .

Warn whenever a pointer is cast, so as to remove a type

qualifier from the target type. For example, warn if a

const char * is cast to an ordinary char * .

Warn if a prototype causes a type conversion that is different

from what would happen to the same argument in the

absence of a prototype. This includes conversions of fixed

point to floating and vice versa, and conversions changing the

width or signedness of a fixed point argument, except when

the same as the default promotion.

Also, warn if a negative integer constant expression is

implicitly converted to an unsigned type. For example, warn

about the assignment x = -1 if x is unsigned. But do not

warn about explicit casts like (unsigned) -1 .

Make all warnings into errors.

Warn if a function can not be inlined, and either it was

declared as inline, or else the -finline-functions option

was given.

Warn whenever an object of larger than len bytes is defined.

Warn if long long type is used. This is default. To inhibit the

warning messages, use -Wno-long-long . Flags

-Wlong-long and -Wno-long-long are taken into account

only when -pedantic flag is used.

-Wmissing-declarations Warn if a global function is defined without a previous

declaration. Do so even if the definition itself provides a

prototype.

DS51686A-page 24

-Wmissing-

format-attribute

-Wmissing-noreturn

-Wmissing-prototypes

-Wnested-externs

-Wno-deprecated-

declarations

-Wpadded

-Wpointer-arith

If -Wformat is enabled, also warn about functions that might

be candidates for format attributes. Note these are only

possible candidates, not absolute ones. This option has no

effect unless -Wformat is enabled.

Warn about functions that might be candidates for attribute

noreturn . These are only possible candidates, not absolute

ones. Care should be taken to manually verify functions.

Actually, do not ever return before adding the noreturn

attribute, otherwise subtle code generation bugs could be

introduced.

Warn if a global function is defined without a previous

prototype declaration. This warning is issued even if the

definition itself provides a prototype. (This option can be used

to detect global functions that are not declared in header files.)

Warn if an extern declaration is encountered within a

function.

Do not warn about uses of functions, variables and types

marked as deprecated by using the deprecated attribute.

Warn if padding is included in a structure, either to align an

element of the structure or to align the whole structure.

Warn about anything that depends on the size of a function

type or of void . MPLAB C32 C compiler assigns these types

a size of 1, for convenience in calculations with void *

pointers and pointers to functions.

? 2007 Microchip Technology Inc.

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