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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/98414] [11 Regression] UBSAN bootstrap is broken:
 ubsan/ubsan_type_hash_itanium.cpp:162: undefined reference to
 `__dynamic_cast' since r11-6083-gb7dfc2074c78415d451eb34d1608016c80b1c41a
Date: Tue, 05 Jan 2021 12:40:08 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98414

Martin Li=C5=A1ka <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[11 Regression] UBSAN       |[11 Regression] UBSAN
                   |bootstrap is broken:        |bootstrap is broken:
                   |ubsan/ubsan_type_hash_itani |ubsan/ubsan_type_hash_itani
                   |um.cpp:162: undefined       |um.cpp:162: undefined
                   |reference to                |reference to
                   |`__dynamic_cast'            |`__dynamic_cast' since
                   |                            |r11-6083-gb7dfc2074c78415d4
                   |                            |51eb34d1608016c80b1c41a
           Keywords|needs-bisection             |
                 CC|                            |nathan at gcc dot gnu.org

--- Comment #3 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
So it started when c++ module mapper was added:
r11-6083-gb7dfc2074c78415d451eb34d1608016c80b1c41a=