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Attempting to compile a program with a function declarator that does not include the appropriate type information typically generates a warning but does not prevent program compilation. These warnings should be resolved. (see See guideline MSC00-C. Compile cleanly at high warning levels.).
Noncompliant Code Example (NonPrototype-Format Declarators)
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C99 eliminated implicit function declarations from the C language \[[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\]. However, many compilers still allow the compilation of programs containing implicitly declared functions, although they may issue a warning message. These warnings should be resolved. (seeSee guideline [MSC00-C. Compile cleanly at high warning levels].). |
Compliant Solution (Function Prototypes)
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Recommendation | Severity | Likelihood | Remediation Cost | Priority | Level |
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DCL07-C | low | unlikely | low | P3 | L3 |
Automated Detection
The LDRA tool suite V 7.6.0 can detect violations of this recommendation.
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Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
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\[[ISO/IEC 9899:1999|AA. Bibliography#ISO/IEC 9899-1999]\] Forward and Section 6.9.1, "Function definitions" \[[ISO/IEC PDTR 24772|AA. Bibliography#ISO/IEC PDTR 24772]\] "IHN Type system" and "OTR Subprogram Signature Mismatch" \[[MISRA 042004|AA. Bibliography#MISRA 04]\] Rule 8.2 \[[Spinellis 062006|AA. Bibliography#Spinellis 06]\] Section 2.6.1, "Incorrect Routine or Arguments" |
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