MISRA C:2023 Rule 20.5

#undef should not be used

Since R2024a

Description

Rule Definition

#undef should not be used¹ .

Rationale

#undef can make the software unclear which macros exist at a particular point within a translation unit.

Troubleshooting

If you expect a rule violation but do not see it, refer to Diagnose Why Coding Standard Violations Do Not Appear as Expected.

Check Information

Group: Preprocessing Directives

Category: Advisory

AGC Category: Readability

Version History

Introduced in R2024a

See Also

Check MISRA C:2023 (-misra-c-2023)

Topics

Check for and Review Coding Standard Violations

¹ All MISRA coding rules and directives are © Copyright The MISRA Consortium Limited 2021.

The MISRA coding standards referenced in the Polyspace^® Bug Finder™ documentation are from the following MISRA standards:

MISRA C:2004
MISRA C:2012
MISRA C:2023
MISRA C++:2008
MISRA C++:2023

MISRA and MISRA C are registered trademarks of The MISRA Consortium Limited 2021.