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MISRA C:2012 Rule 20.14

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

Description

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

Additional Message in Report

  • '#else' not within a conditional.

  • '#elseif' not within a conditional.

  • '#endif' not within a conditional.

    Unterminated conditional directive.

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: Required
AGC Category: Required

See Also

Topics