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Subject: [Bug c++/96645] [9/10/11/12 Regression] [CWG2335] std::variant
 default constructor and unparsed DMI
Date: Thu, 24 Mar 2022 18:31:46 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96645

--- Comment #21 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jason Merrill <jason@gcc.gnu.org>:

https://gcc.gnu.org/g:346ab5a54a831ad9c78afcbd8dfe98e0e07e3070

commit r12-7804-g346ab5a54a831ad9c78afcbd8dfe98e0e07e3070
Author: Jason Merrill <jason@redhat.com>
Date:   Tue Mar 22 01:10:44 2022 -0400

    c++: delayed parse DMI [PR96645]

    With the changes for PR81359 and PR88368 to make get_nsdmi errors be
treated
    as substitution failure, we have the problem that if we check
    std::is_default_constructible for a complete class that still has unpar=
sed
    default member initializers, we get an answer (false) that will be wrong
    once the DMIs have been parsed.  The traits avoid this problem for regu=
lar
    incomplete classes by giving an error if the operand is incomplete; we
    should do the same if get_nsdmi is going to fail due to unparsed DMI.

            PR c++/96645

    gcc/cp/ChangeLog:

            * cp-tree.h (type_has_default_ctor_to_be_synthesized): Declare.
            * class.cc (type_has_default_ctor_to_be_synthesized): New.
            (type_has_non_user_provided_default_constructor_1): Support it.
            (type_has_non_user_provided_default_constructor): Now a wrapper.
            * method.cc (complain_about_unparsed_dmi): New.
            (constructible_expr): Call it.

    gcc/testsuite/ChangeLog:

            * g++.dg/ext/is_constructible3.C: Expect error.
            * g++.dg/ext/is_constructible7.C: New test.=