...
All occurrences in a source file of the following sequences of three characters (that is, trigraph sequences) are replaced with the corresponding single character.
??=
#
??)
]
??!
|
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="7e30b98a78e21d62-799e3564-4ed14bd7-8584afa3-b02dd067b708d95ddeba808d"><ac:plain-text-body><![CDATA[
??(
[
??'
^
??>
}
]]></ac:plain-text-body></ac:structured-macro>
??/
\
??<
{
??-
~
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Recommendation | Severity | Likelihood | Remediation Cost | Priority | Level |
|---|---|---|---|---|---|
PRE07-A | 1 (low) | 1 (unlikely) | 2 (medium) | P2 | L3 |
Automated Detection
GCC provides a --no-trigraph option that is enabled by default. GCC also provides the -Wtrigraphs option that warns when trigraphs are used.
The LDRA tool suite V 7.6.0 is able to detect violations of this recommendation.
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