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Subject: [Bug c++/97890] Abstract virtual classes suddenly allowed as
 parameter types ?
Date: Wed, 18 Nov 2020 12:19:48 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97890

David Binderman <dcb314 at hotmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org

--- Comment #4 from David Binderman <dcb314 at hotmail dot com> ---
A quick review of the git log suggests Jason Merrill 's commit hashed as
baf38d2e363971ed8baa5f82b2eaf21cd8e74aae is a hot candidate.

Given that clang-11 won't compile the code (even with -std=3Dc++20)=20
and gcc didn't used to, is it perhaps a good idea to=20

a) go back to old behaviour by default for gcc.
b) put gcc's new behaviour into -std=3Dc++20 only.

Perhaps Jason is well placed to advise further.=