UPCONV | NOUPCONV (C only)

Pragma equivalent

#pragma options(upconv) (C only), #pragma options(noupconv) (C only)

Purpose

Specifies whether the unsigned specification is preserved when integral promotions are performed.

Syntax

Defaults

NOUPCONV

Note: The cc compiler invocation command for a regular compile in the z/OS® UNIX System Services environment uses UPCONV as the default option.

Usage

The UPCONV option causes the z/OS XL C compiler to follow unsignedness preserving rules when doing C type conversions; that is, when widening all integral types (char, short, int, long). Use this option when compiling older C programs that depend on the K&R C conversion rules.

Note: This document uses the term K&R C to refer to the C language plus the generally accepted extensions produced by Brian Kernighan and Dennis Ritchie that were in use prior to the ISO standardization of C.

Whenever the UPCONV compiler option is in effect, the usage status of the UPCONV option is inserted in the object file to aid you in diagnosing a problem with your program.

Predefined macros

None.