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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/84476] [[nodiscard]] ignored on virtual functions accessed
 through pointer
Date: Wed, 02 Jun 2021 10:29:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D84476

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Martin Ankerl from comment #1)
> I just "discovered" this bug as well. The warning works correctly in g++
> 6.4, but starting from 7.1 upwards it does not work any more.

No, I don't think that's true, this never worked. The warning for gcc 6 is
telling you that it doesn't understand the [[nodiscard]] attribute. You wou=
ld
get the same warning for [[lolwut]].

GCC 7 does understand the attribute, so that -Wattributes warning is gone, =
but
the expected warning about the unused result is missing.=