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According to C99 \[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] Section 5.1.1.3:

*MSC00-EX1:* Compilers can produce diagnostic messages for correct code. This is permitted by C99 \[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\], which allows a compiler to produce a diagnostic for any reason.  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.

\[[ISO/IEC 9899:1999|AA. References#ISOBibliography#ISO/IEC 9899-1999]\] Section 5.1.1.3, "Diagnostics"
\[[MITRE 07|AA. References#MITREBibliography#MITRE 07]\] [CWE ID 563|http://cwe.mitre.org/data/definitions/563.html], "Unused Variable"; [CWE ID 570|http://cwe.mitre.org/data/definitions/570.html], "Expression is Always False"; [CWE ID 571|http://cwe.mitre.org/data/definitions/571.html], "Expression is Always True"
\[[Sutter 05|AA. References#SutterBibliography#Sutter 05]\] Item 1
\[[Seacord 05a|AA. References#SeacordBibliography#Seacord 05]\] Chapter 8, "Recommended Practices"