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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/107461] [12 Regression] ambiguity error for friend with
 templated constexpr argument
Date: Fri, 03 Feb 2023 15:07:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107461

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:534aea1ca7e7538dc6af3eac3cd2ec6c7343fdee

commit r12-9103-g534aea1ca7e7538dc6af3eac3cd2ec6c7343fdee
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Feb 3 09:41:10 2023 -0500

    c++: unexpected ADDR_EXPR after overload set pruning [PR107461]

    Here the ahead-of-time overload set pruning in finish_call_expr is
    unintentionally returning a CALL_EXPR whose (pruned) callee is wrapped
    in an ADDR_EXPR, despite the original callee not being wrapped in an
    ADDR_EXPR.  This ends up causing a bogus declaration mismatch error in
    the below testcase because the call to min in #1 gets expressed as a
    CALL_EXPR of ADDR_EXPR of FUNCTION_DECL, whereas the level-lowered call
    to min in #2 gets expressed instead as a CALL_EXPR of FUNCTION_DECL.

    This patch fixes this by stripping the spurious ADDR_EXPR appropriately.
    Thus the first call to min now also gets expressed as a CALL_EXPR of
    FUNCTION_DECL, matching the behavior before r12-6075-g2decd2cabe5a4f.

            PR c++/107461

    gcc/cp/ChangeLog:

            * semantics.cc (finish_call_expr): Strip ADDR_EXPR from
            the selected callee during overload set pruning.

    gcc/testsuite/ChangeLog:

            * g++.dg/template/call9.C: New test.

    (cherry picked from commit 59e0376f607805ef9b67fd7b0a4a3084ab3571a5)=