[Bug c++/102651] [9/10/11/12 Regression] typeid(X**) instantiates X caused by r0-109856

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102651

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Jason Merrill
<jason@gcc.gnu.org>:

https://gcc.gnu.org/g:5237059e04d105fe5441fa7434699eea9a34bf1b

commit r12-8378-g5237059e04d105fe5441fa7434699eea9a34bf1b
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Apr 15 00:11:00 2022 -0400

    c++: typeid and instantiation [PR102651]

    PR49387 was a problem with initially asking for a typeid for a class
    template specialization before it was complete, and later actually filling
    in the descriptor when the class was complete, and thus disagreeing on the
    form of the descriptor.  I fixed that by forcing the class to be complete,
    but this testcase shows why that approach is problematic.  So instead let's
    adjust the type of the descriptor later if needed.

            PR c++/102651
            PR c++/49387

    gcc/cp/ChangeLog:

            * rtti.cc (get_tinfo_decl_direct): Don't complete_type.
            (emit_tinfo_decl): Update tdesc type if needed.

    gcc/testsuite/ChangeLog:

            * g++.dg/rtti/typeid-complete1.C: New test.