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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/91618] [9/10/11 Regression] template-id required to friend
 a function template, even for a qualified-id
Date: Wed, 03 May 2023 19:25:17 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D91618

--- Comment #15 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The trunk branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:7ce078ceca42f184f6f60c3ca921b6e07cf2c4bd

commit r14-460-g7ce078ceca42f184f6f60c3ca921b6e07cf2c4bd
Author: Jason Merrill <jason@redhat.com>
Date:   Wed May 3 13:32:55 2023 -0400

    c++: over-eager friend matching [PR109649]

    A bug in the simplification I did around 91618; at this point X<int>::f=
 has
    DECL_IMPLICIT_INSTANTIATION set, but we've already identified what temp=
late
    it corresponds to, so we don't want to call check_explicit_specializati=
on.

    To distinguish this case we need to look at DECL_TI_TEMPLATE.  grokfnde=
cl
    has for a long time set it to the OVERLOAD in this case, while the new
cases
    I added for 91618 were leaving DECL_TEMPLATE_INFO null; let's adjust th=
em
to
    match.

            PR c++/91618
            PR c++/109649

    gcc/cp/ChangeLog:

            * friend.cc (do_friend): Don't call check_explicit_specializati=
on
if
            DECL_TEMPLATE_INFO is already set.
            * decl2.cc (check_classfn): Set DECL_TEMPLATE_INFO.
            * name-lookup.cc (set_decl_namespace): Likewise.

    gcc/testsuite/ChangeLog:

            * g++.dg/template/friend77.C: New test.=