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All occurrences in a source file of the following sequences of three characters (that is, trigraph sequences) are replaced with the corresponding single character.
??=
#
??)
]
??!
|
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??(
[
??'
^
??>
}
]]></ac:plain-text-body></ac:structured-macro>
??/
\
??<
{
??-
~
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Recommendation | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
PRE07-C | low | unlikely | medium | P2 | L3 |
Automated Detection
GCC provides a -Wtrigraphs option that warns when trigraphs are used. GCC also provides a --no-trigraph option that is enabled by default.
The LDRA tool suite V 7.6.0 can detect violations of this recommendation.
GCC Compiler can detect violation of this recommendation when the -Wtrigraphs flag is used.
Related Vulnerabilities
Search for vulnerabilities resulting from the violation of this rule on the CERT website.
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