LANG.COMM.CPP : C++ Comment in C

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CodeSonar^® 9.2p0

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C and C++

LANG.COMM.CPP : C++ Comment in C

Summary

A C source file is compiled as C90 but contains C++-style comments (that is, comments introduced by //).

Properties

Class Name

C++ Comment in C

Significance

style

Mnemonic

LANG.COMM.CPP

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="C++ Comment in C"

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

Many compilers will fail with an error if they encounter a C++-style comment while compiling in C90 mode. If you are using such a compiler you will generally detect and resolve bugs of this class at compilation time, before the CodeSonar analysis runs.

/* LANG.COMM.CPP.c */

static int i=5; // C++-style comment about i
                /* 'C++ Comment in C' warning issued on previous line if compiled as C90 */

/* LANG.COMM.CPP.cpp */

static int i=5; // C++-style comment about i
                /* no 'C++ Comment in C' warning on previous line if compiled as C++ */

Relevant Configuration File Parameters

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

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