http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56760
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-03-28 11:05:26 UTC --- (In reply to comment #8) > I read the section on name lookup changes at > http://gcc.gnu.org/gcc-4.7/porting_to.html > > but it talks about a different kind of problem. Consider that there the > compiler does error messages. But here at our problem the linker (!) does the > error. It's the same problem. You get a linker error because this line: func(containHolder, b); // COMMENT THIS OUT AND IT WORKS calls this function: template<class T> void func(const seco::contain<T> &a, nam::binbuffer &b) { func(*a.wombat, b); } which then calls this function: template<class T> void func (const T &a, nam::binbuffer &b); which is not defined. So you get a linker error. You are expecting it to call this function: template<class T> void func(const seco::holder<T> &a, nam::binbuffer &b) { func(*a.fun, b); } but it cannot, because that is not declared before it is used. This is the situation described in the name lookup changes. Your code is not valid C++, the compiler is correct.
