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

JavaScript is not currently enabled, but is required for full CodeSonar manual search and browse functionality.

If you are viewing this file in your hub's Web GUI, enable JavaScript in your browser: you will also need it for GUI functionality.

If you opened this file directly from disk, your browser may be directly suppressing JavaScript functionality: certain browsers perform this suppression on local files (but not files delivered by web servers) for security reasons.

If you access the manual through the hub's Web GUI, the functionality will not be suppressed because the hub is a web server.
Alternatively, your browser may allow you to explicitly disable the security setting that suppresses functionality. See the CodeSonar FAQ for more information.

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

Class Name

C++ Comment in C

Significance

style

Mnemonic

LANG.COMM.CPP

Categories

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.

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++ */

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

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

Summary

Properties

Example

Relevant Configuration File Parameters