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MPLAB ? C32 C Compiler User’s Guide

1.8.3

Options for Controlling the C Dialect

The following options define the kind of C dialect used by the compiler.

TABLE 1-4:

C DIALECT CONTROL OPTIONS

DS51686A-page 18

Option

-ansi

-aux-info filename

-ffreestanding

-fno-asm

-fno-builtin

-fno-builtin- function

-fsigned-char

-fsigned-bitfields

-funsigned-bitfields

-fno-signed-bitfields

-fno-unsigned-bitfields

-funsigned-char

-fwritable-strings

Definition

Support all (and only) ANSI-standard C programs.

Output to the given filename prototyped declarations for all

functions declared and/or defined in a translation unit,

including those in header files. This option is silently

ignored in any language other than C. Besides

declarations, the file indicates, in comments, the origin of

each declaration (source file and line), whether the

declaration was implicit, prototyped or unprototyped ( I , N

for new or O for old, respectively, in the first character after

the line number and the colon), and whether it came from a

declaration or a definition ( C or F , respectively, in the

following character). In the case of function definitions, a

K&R-style list of arguments followed by their declarations is

also provided, inside comments, after the declaration.

Assert that compilation takes place in a freestanding

environment. This implies -fno-builtin . A freestanding

environment is one in which the standard library may not

exist, and program startup may not necessarily be at main.

The most obvious example is an OS kernel. This is

equivalent to -fno-hosted .

Do not recognize asm , inline or typeof as a keyword,

so that code can use these words as identifiers. You can

use the keywords __ asm __ , __ inline __ and

__ typeof __ instead.

-ansi implies -fno-asm .

Don't recognize built-in functions that do not begin with

__ builtin_ as prefix.

Let the type char be signed, like signed char .

(This is the default.)

These options control whether a bit field is signed or

unsigned, when the declaration does not use either signed

or unsigned. By default, such a bit field is signed, unless

-traditional is used, in which case bit fields are always

unsigned.

Let the type char be unsigned, like unsigned char .

Store strings in the writable data segment and don’t make

them unique.

? 2007 Microchip Technology Inc.

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