[[maybe_unused]] does not suppress unusedPrivateFunction

[Artem Amirkhanov]

First, thank you for making cppcheck :)

Following snippet produces "unused private function" [unusedPrivateFunction] style warning, despite the use of [[maybe_unused]] attribute which one could expect to be recognized by cppcheck based on this post: https://sourceforge.net/p/cppcheck/news/2021/04/c17-support-in-cppcheck/

class Foo
{
private:
    [[maybe_unused]] int Return42() { return 42; }
};

void f()
{
    [[maybe_unused]] Foo foo;
}

I tested with cppcheck 2.9 and was able to reproduce in online demo tool.

[CHR]

Thanks for reporting, fixed by https://github.com/danmar/cppcheck/pull/4579