LANG.EXT.TYPEOF : GNU Typeof

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CodeSonar^® 9.2p0

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C and C++

LANG.EXT.TYPEOF : GNU Typeof

Summary

A use of typeof (which is a GNU extension).

Properties

Class Name

GNU Typeof

Significance

style

Mnemonic

LANG.EXT.TYPEOF

Categories

MisraC2025	MisraC2025:D.1.2	The use of language extensions should be minimized
MisraC2023	MisraC2023:1.2	Language extensions should not be used
Misra2012	Misra2012:1.2	Language extensions should not be used
Misra2004	Misra2004:1.1	All code shall conform to ISO/IEC 9899:1990 "Programming languages C", amended and corrected by ISO/IEC 9899/COR1:1995, ISO/IEC 9899/AMD1:1995, and ISO/IEC 9899/COR2:1996
	Misra2004:2.2	Source code shall only use /* ... */ style comments
JPL	JPL:1	Do not stray outside the language definition.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="GNU Typeof"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

Example

int LANG_EXT_TYPEOF(int *i){
  typeof(*i) x = *i; /* 'GNU Typeof' warning issued here */
  /* ... remainder of function */
  return x;
}

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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