Compile code using the highest warning level available for your compiler and eliminate warnings by modifying the code.
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A conforming implementation shall produce at least one diagnostic message (identified in an implementation-defined manner) if a preprocessing translation unit or translation unit contains a violation of any syntax rule or constraint, even if the behavior is also explicitly specified as undefined or implementation-defined. Diagnostic messages need not be produced in other circumstances.
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If suitable source code-checking tools are available, use them regularly.
Exceptions
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*MSC00-EX1:* Compilers can produce diagnostic messages for correct code, as is permitted by C99 \ [[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\]. It is usually preferable to rewrite code to eliminate compiler warnings, but, if the code is correct, it is sufficient to provide a comment explaining why the warning message does not apply. Some compilers provide ways to suppress warnings, such as suitably formatted comments or pragmas, which can be used sparingly when the programmer understands the implications of the warning but has good reason to use the flagged construct anyway.
Do not simply quiet warnings by adding type casts or other means. Instead, understand the reason for the warning and consider a better approach, such as using matching types and avoiding type casts whenever possible.
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Recommendation | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
MSC00-C | medium | probable | medium | P8 | L2 |
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
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MITRE CWE: CWE-571, "Expression is Always True"
Bibliography
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\[[Sutter 2005|AA. Bibliography#Sutter 05] \] Item 1
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[[Seacord 2005a|AA. Bibliography#Seacord 05]\] Chapter 8, "Recommended Practices"
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