tree 23c3fbf034db9747bc4e05a833d1b096e9e29ee4
parent e7c12a921525b2aa27ca4814c42c63d61a6d954e
author Jason Merrill <jason@redhat.com> 1668163502 -1000
committer Jason Merrill <jason@redhat.com> 1668466298 -0500

c++: only declare satisfied friends

A friend declaration can only have constraints if it is defined.  If
multiple instantiations of a class template define the same friend function
signature, it's an error, but that shouldn't happen if it's constrained to
only be declared in one instantiation.

Currently we don't mangle requirements, so the foos all mangle the same and
actually instantiating #1 will break, but for now we can test that they're
considered distinct.

gcc/cp/ChangeLog:

	* pt.cc (tsubst_friend_function): Check satisfaction.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp2a/concepts-friend11.C: New test.