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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/69836] compilation error with constexpr in template types
 with redeclared methods
Date: Wed, 26 Apr 2023 21:16:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D69836

--- Comment #6 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:1e27e7e0985e055b3d4ec92e93976b709fdbe425

commit r14-277-g1e27e7e0985e055b3d4ec92e93976b709fdbe425
Author: Jason Merrill <jason@redhat.com>
Date:   Wed Feb 1 17:00:48 2023 -0500

    c++: unique friend shenanigans [PR69836]

    Normally we re-instantiate a function declaration when we start to
    instantiate the body in case of multiple declarations.  In this wacky
    testcase, this causes a problem because the type of the w_counter param=
eter
    depends on its declaration not being in scope yet, so the name lookup o=
nly
    finds the previous declaration.  This isn't a problem for member functi=
ons,
    since they aren't subject to argument-dependent lookup.  So let's just =
skip
    the regeneration for hidden friends.

            PR c++/69836

    gcc/cp/ChangeLog:

            * pt.cc (regenerate_decl_from_template): Skip unique friends.

    gcc/testsuite/ChangeLog:

            * g++.dg/template/friend76.C: New test.=