QA·C Help - 0828

	0828	[L] More than 8 levels of nested conditional inclusion - program does not conform strictly to ISO:C90.

ISO C90 Conformance limits		REFERENCE - ISO:C90-5.2.4.1 Translation Limits

The translation limits specified in the ISO:C Standard define a minimum set of conditions which a compiler must support in order to be described as conforming. In practice, compilers will often tolerate code which exceeds these minimal requirements. However, in order to ensure portability, it is advisable to avoid writing code that assumes a level of compiler capability which may not always be supported.

Message 0828 identifies situations where the nesting level of conditional inclusion directives exceeds 8, the minimum requirement of the ISO:C90 Standard. Message 0372 identifies code which breaches the corresponding ISO:C99 limit, i.e. 63 levels. These messages are not identifying incorrect code but they do identify code which is described in the respective standard as not strictly conforming.

For example:


/*PRQA S 2017,3408 ++*/

#define MAC 1000

#if MAC > 0
#if MAC > 10
#if MAC > 20
#if MAC > 30
#if MAC > 40
#if MAC > 50
#if MAC > 60
#if MAC > 70
#if MAC > 80              /* Message 0828 */
#if MAC > 90
#if MAC > 100
#if MAC > 110
#if MAC > 120
#if MAC > 130
#if MAC > 140
#if MAC > 150
#if MAC > 160
#if MAC > 170
#if MAC > 180
#if MAC > 190
#if MAC > 200
#if MAC > 210
#if MAC > 220
#if MAC > 230
#if MAC > 240
#if MAC > 250
#if MAC > 260
#if MAC > 270
#if MAC > 280
#if MAC > 290
#if MAC > 300
#if MAC > 310
#if MAC > 320
#if MAC > 330
#if MAC > 340
#if MAC > 350
#if MAC > 360
#if MAC > 370
#if MAC > 380
#if MAC > 390
#if MAC > 400
#if MAC > 410
#if MAC > 420
#if MAC > 430
#if MAC > 440
#if MAC > 450
#if MAC > 460
#if MAC > 470
#if MAC > 480
#if MAC > 490
#if MAC > 500
#if MAC > 510
#if MAC > 520
#if MAC > 530
#if MAC > 540
#if MAC > 550
#if MAC > 560
#if MAC > 570
#if MAC > 580
#if MAC > 590
#if MAC > 600
#if MAC > 610
#if MAC > 620
#if MAC > 630            /* Message 0372 */
#if MAC > 640
extern void fn(void)
{
}
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif