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How can I suppress this error in valgrind’s output?
==16727== 1 errors in context 2 of 18:
==16727== Conditional jump or move depends on uninitialised value(s)
What causes this error? Can I just ignore it?
It means that one of your control path is such that an variable/data does not get initialized when that control path gets executed. Unitialized variables usually result in Undefined Behavior So valgrind detects it and reports it.
Have a look at this, It shall help you understand the error.
Also, add the flag
--track-origins=yesto valgrind and it will give you information on the sources of uninitialised data.