AN3350 datasheet(135/185 Pages) STMICROELECTRONICS

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AN3350

Pragmas for language translation

Doc ID 018512 Rev 2

135/185

Syntax

#pragma mpwc_newline on | off | reset

Remarks

If you enable this pragma, the compiler translates '\n' as a Carriage Return (0x0D) and

'\r'

as a Line Feed (0x0A). Otherwise, the compiler uses the ISO standard conventions for

these characters.

If you enable this pragma, use ISO standard libraries that were compiled when this pragma

was enabled.

If you enable this pragma and use the standard ISO standard libraries, your program will not

read and write '\n' and '\r' properly. For example, printing '\n' brings your program’s

output to the beginning of the current line instead of inserting a newline.

This pragma does not correspond to any IDE panel setting. By default, this pragma is

disabled.

18.8

mpwc_relax

Controls the compatibility of the char* and unsigned char* types.

Syntax

#pragma mpwc_relax on | off | reset

Remarks

If you enable this pragma, the compiler treats char* and unsigned char* as the same

type. Use this setting to compile source code written before the ISO C standards. Old

source code frequently uses these types interchangeably.

This setting has no effect on C++ source code.

Note:

Turning this option on may prevent the compiler from detecting some programming errors.

We recommend not turning on this option.

Example 82 shows how to use this pragma to relax function pointer checking.

Example 82 Relaxing function pointer checking

#pragma mpwc_relax on

extern void f(char *);

/* Normally an error, but allowed. */

extern void(*fp1)(void *) = &f;

/* Normally an error, but allowed. */

extern void(*fp2)(unsigned char *) = &f;

This pragma does not correspond to any panel setting. By default, this pragma is disabled.

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