MISRA C:2023 Rule 20.14

Rule Definition

All #else, #elif and #endif preprocessor directives shall reside in the same file as the #if, #ifdef or #ifndef directive to which they are related.

Rationale

When conditional compilation directives include or exclude blocks of code and are spread over multiple files, confusion arises. If you terminate an #if directive within the same file, you reduce the visual complexity of the code and the chances of an error.

If you terminate #if directives within the same file, you can use #if directives in included files

Troubleshooting

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