GPL Infectiousness

On 1 Oct 2002, Derek Neighbors wrote:
> I disagree. I can download libFoo that is GPL and link proprietary
> software to it til my heart is content. I only have problems if I try
> to 'distribute' my application with it linked to libFoo.

If I write a proprietary app that links to a function called FooBarBaz,
how do I know whether there is a GPL FooBarBaz or something else called
FooBarBaz. Maybe I have a proprietary library providing FooBarBaz, but
you're using a GPL'd one... who's to say you can't?

\\/