QA·C Help - 4640

	4640	The macro '%1s' could conflict in the future with the name of a macro in '<%2s>'.

Identifiers		REFERENCE - ISO:C90-7.13 Future Library Directions, ISO:C99-7.26 Future Library Directions

This macro name is a reserved identifier and could be introduced as a macro in a future revision of the specified system library file.

Identifiers of this form are described in the ISO:C99 standard in Section 7.26 - Future Library Directions.

Names to avoid are:

Names beginning with E and a digit or an uppercase letter may be added to <errno.h>.
Names beginning with LC_ and an uppercase letter may be added to <locale.h>.
Names beginning with SIG or SIG_ and an uppercase letter may be added to <signal.h>.
Names beginning with LC_ and an uppercase letter may be added to <locale.h>.
Names beginning with PRI or SCN and a lowercase letter may be added to <inttypes.h>.
Names beginning with PRIX or SCNX may be added to <inttypes.h>.
Names beginning with INT and ending with _MAX may be added to <stdint.h>.
Names beginning with INT and ending with _MIN may be added to <stdint.h>.
Names beginning with INT and ending with _C may be added to <stdint.h>.
Names beginning with UINT and ending with _MAX may be added to <stdint.h>.
Names beginning with UINT and ending with _MIN may be added to <stdint.h>.
Names beginning with UINT and ending with _C may be added to <stdint.h>.

Although these names may not currently be used in the standard library, they might be in the future and it is therefore best to avoid them.

For example:


/*PRQA S 553,2017 ++*/

#define EA                /* Message 4640 - A macro of this name could be defined in a future revision of <errno.h>    */
#define LC_A              /* Message 4640 - A macro of this name could be defined in a future revision of <locale.h>   */
#define SIGA              /* Message 4640 - A macro of this name could be defined in a future revision of <signal.h>   */
#define PRIa              /* Message 4640 - A macro of this name could be defined in a future revision of <inttypes.h> */
#define PRIXA             /* Message 4640 - A macro of this name could be defined in a future revision of <inttypes.h> */
#define SCNa              /* Message 4640 - A macro of this name could be defined in a future revision of <inttypes.h> */
#define SCNXA             /* Message 4640 - A macro of this name could be defined in a future revision of <inttypes.h> */
#define INTA_MAX          /* Message 4640 - A macro of this name could be defined in a future revision of <stdint.h>   */
#define INTa_C            /* Message 4640 - A macro of this name could be defined in a future revision of <stdint.h>   */
#define UINTA_MIN         /* Message 4640 - A macro of this name could be defined in a future revision of <stdint.h>   */
#define UINTA_C           /* Message 4640 - A macro of this name could be defined in a future revision of <stding.h>   */

No MISRA C:2012 Rules applicable to message 4640