[Bug c++/47461] warn_unused_result attribute ignored for templates

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47461

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Works with 4.9.0

w.cc: In function ‘void f(C*)’:
w.cc:6:33: warning: ignoring return value of ‘bool C::f(T*) [with T = int]’,
declared with attribute warn_unused_result [-Wunused-result]
 void f(C* pc) { int i; pc->f(&i); }
                                 ^