------- Additional Comments From bangerth at dealii dot org 2005-04-18 20:34 ------- And the answer to the original question: even though gcc handled it as this in the past (incorrectly), a friend declaration is not a declaration. In other words, if a name is not declared before, but first seen in a friend declaration, then this does not make this name known. This is the problem you run against: class Y is only marked for friendship in the friend declaration, for when the class is actually declared later on. However, it is still undeclared once you get to the function declaration. W.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21092
