LANG.STRUCT.TRIGRAPH : Trigraph

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CodeSonar^® 9.2p0

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C and C++

LANG.STRUCT.TRIGRAPH : Trigraph

Summary

A line contains one or more of the following trigraphs.

??( ??) ??< ??> ??= ??/ ??' ??! ??-

Warnings of this class will only be issued for code that is compiled with trigraph recognition enabled (for example, with gcc -trigraphs).

Properties

Class Name

Trigraph

Significance

style

Mnemonic

LANG.STRUCT.TRIGRAPH

Categories

MisraC2025	MisraC2025:4.2	Trigraphs should not be used
MisraC2023	MisraC2023:4.2	Trigraphs should not be used
Misra2012	Misra2012:4.2	Trigraphs should not be used
Misra2004	Misra2004:4.2	Trigraphs shall not be used
AUTOSARC++14	AUTOSARC++14:A2-5-1	Trigraphs shall not be used.
MisraC++2008	MisraC++2008:2-3-1	Trigraphs shall not be used.
MisraC++2023	MisraC++2023:5.0.1	Trigraph-like sequences should not be used
JSF++	JSF++:11	Trigraphs will not be used.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default. To enable them, add the following WARNING_FILTER rule to the project configuration file.

WARNING_FILTER += allow class="Trigraph"

Example

/* a trigraph in a comment ??/ */    /* 'Trigraph' warning issued here if trigraphs are enabled */
 
??=define ONE 1                      /* 'Trigraph' warning issued here if trigraphs are enabled */
                                     /* (parse error otherwise) */
                                 
char *tristr = "??-??-";             /* 'Trigraph' warning issued  here if trigraphs are enabled */

char *okstr = "??3";                                      /* ??3 is not a trigraph */

Relevant Configuration File Parameters

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

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