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Subject: [Bug c++/103831] non-dependent call to non-static member function
 not rejected ahead of time when there are dependent bases and no 'this'
Date: Wed, 12 Jan 2022 17:03:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103831

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

https://gcc.gnu.org/g:614a9580d4463c4aefd74c40ed46bfab2bef65c7

commit r11-9456-g614a9580d4463c4aefd74c40ed46bfab2bef65c7
Author: Patrick Palka <ppalka@redhat.com>
Date:   Tue Jan 11 13:00:48 2022 -0500

    c++: dependent bases and 'this' availability [PR103831]

    Here during satisfaction of B's constraints we're failing to reject the
    object-less call to the non-static member function A::size ultimately
    because satisfaction is performed in the (access) context of the class
    template B, which has a dependent base, and so the any_dependent_bases_p
    check within build_new_method_call causes us to not reject the call.
    (Subsequent constexpr evaluation of the call succeeds since the function
    is effectively static.)

    This patch fixes this by refining the any_dependent_bases_p check within
    build_new_method_call: if we're in a context where 'this' is unavailabl=
e,
    then we cannot resolve the implicit object regardless of the presence of
    a dependent base.  So let's also check current_class_ptr alongside a_d_=
b_p.

            PR c++/103831

    gcc/cp/ChangeLog:

            * call.c (build_new_method_call): Consider dependent bases only
            if 'this' is available.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/concepts-class3.C: New test.
            * g++.dg/template/non-dependent18.C: New test.

    (cherry picked from commit 0378f563b0321c44c4a9c98cf46d2a22b9160f76)=