[PING^2] [C/C++] PR c/4076 -Wunused doesn't warn about static function only called by itself

[Manuel López-Ibáñez]

On 16/03/07, Nathan Sidwell <nathan@codesourcery.com> wrote:
> Manuel López-Ibáñez wrote:
>
> > I could but I was not able to construct a case where it was necessary.
> > How can a static function make a scoped recursive call? Sorry my
> > knowledge of C++ is not so good.
>
> namespace { struct X { void Foo () { X::Foo (); }}}
>
> might just cut it.  Yes I know anonymous namespaces are not quite the same as
> static, and I don't know if we'll check this, but it seems wise to copy the
> idiom you've introduced.
>

I can copy the condition. Much better, I can put it inside mark_used
so we don't have to duplicate it everywhere. But still we cannot catch
the above case. We don't even catch

namespace {
    void foobar();
    void foobar() { return; }
}

It seems that check_global_declarations, which is the one that emits
the Wunused-function warnings, is not called for functions in an
anonymous namespace. I tried finding where the decision is made
without any success. Any ideas?

Manuel.