Suppression does not work

[Mikael Heden]

Hi,

I have a suppression-list file and it is working fine. However, sometimes the suppression doesn't kick in for some reason.

Here is an example:

Snip from xml output file:

        <error id="misra-c2012-5.6" severity="style" msg="A typedef name shall be a unique identifier" verbose="A typedef name shall be a unique identifier">
            <location file="lib\src\Misc\Typedef.c" line="44" column="5"/>
        </error>
        <error id="misra-c2012-5.6" severity="style" msg="A typedef name shall be a unique identifier" verbose="A typedef name shall be a unique identifier">
            <location file="lib\src\Misc\Typedef.c" line="43" column="5"/>
        </error>
        <error id="misra-c2012-5.6" severity="style" msg="A typedef name shall be a unique identifier" verbose="A typedef name shall be a unique identifier">
            <location file="lib\src\Misc\Typedef.c" line="57" column="5"/>
        </error>
        <error id="misra-c2012-5.6" severity="style" msg="A typedef name shall be a unique identifier" verbose="A typedef name shall be a unique identifier">
            <location file="lib\src\Misc\Typedef.c" line="50" column="5"/>
        </error>

Add suppression to the misra-suppression.txt file:

misra-c2012-5.6:lib/src/Misc/Typedef.c

The violations from the xml output disappeared (as expected) but I get this error instead:

        <error id="unmatchedSuppression" severity="information" msg="Unmatched suppression: misra-c2012-5.6" verbose="Unmatched suppression: misra-c2012-5.6">
            <location file="lib\src\Misc\Typedef.c" line="0" column="0"/>
        </error>

Here is the commandline:

    -$(Q)$(CPPCHECK) \
        --project=$< \
        --check-level=exhaustive \
        -j $(NUMBER_OF_PROCESSORS) \
        --output-file=$@ \
        --cppcheck-build-dir=$(OUT)/cppcheck \
        --addon=lib/tools/cppcheck-misra.json \
        --addon-python=%PYTHON% \
        --std=c99 \
        $(CPPCHECK_EXTRA_ARGS) \
        --enable=all \
        --suppress=unusedFunction \
        --suppressions-list=misra-suppressions.txt \
        --checkers-report=$(OUT)/cppcheck-checkers.txt \
        -q \
        --xml

cppcheck 2.16

Does anyone have any ideas on why this occur?

[Oliver Stöneberg]

unmatchedSuppression is currently broken in many ways. I will take a look after https://github.com/danmar/cppcheck/pull/5647 has been merged.

[Oliver Stöneberg]

Will be a bit longer until I look into this issue. I am currently focused on finally dogfooding unmatched suppressions.