Warning message with usage of visibility hidden with wrapper class

Hi all,

My team at work and I have started to utilize the visibility
attributes in gcc so that we are building 'nix libraries whose public
symbols are in-line with our Windows builds. With some of our code
though, we're noticing warnings about parts being declared with
greater visibility.  As far as we've been able to determine, there's
nothing being executed incorrectly, but we'd like to understand the
warning before ignoring it.

The code in question is basically set up like this:

class __attribute__ ((visibility ("hidden"))) SomeClass
{
  ...
}

template <T>
class WrappingSomeClass
{
...
  void someFunc()
  {
    SomeClass var;
    ...
  }
...
}

Where the warning occurs on usage of SomeClass in WrappingSomeClass.
Any code using this example links to the library with SomeClass in it.
Any help you can give would be appreciated, and if my super
simplification is overly so, let me know and I can give it in more
detail.

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CSS