[Bug c++/105143] c++20: ICE when trying to emit a [[nodiscard]] warning and non-type template arugument

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105143

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-11 branch has been updated by Patrick Palka
<ppa...@gcc.gnu.org>:

https://gcc.gnu.org/g:4e47b450b72f082de6fba7a060c3a751954e6c17

commit r11-9797-g4e47b450b72f082de6fba7a060c3a751954e6c17
Author: Patrick Palka <ppa...@redhat.com>
Date:   Wed Apr 6 11:46:25 2022 -0400

    c++: make -Wctad-maybe-unsupported respect complain [PR105143]

    We were attempting to issue a -Wctad-maybe-unsupported warning even when
    complain=tf_none, which led to a crash in the first testcase below and a
    bogus error during overload resolution in the second testcase.

            PR c++/105143

    gcc/cp/ChangeLog:

            * pt.c (do_class_deduction): Check complain before attempting
            to issue a -Wctad-maybe-unsupported warning.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/nodiscard1.C: New test.
            * g++.dg/warn/Wctad-maybe-unsupported4.C: New test.

    (cherry picked from commit e58484a019c57b1085bbbcc1654f1944feddfe73)