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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 14:24:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98414

--- Comment #9 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #8)
> I don't.  LIBUBSAN_SPEC comes from gcc.c, while the libstdc++ stuff comes
> from cp/g++spec.c and the ordering between the two is hard to achieve, pl=
us
> it is unclear if we shouldn't for -static-libubsan instead just add anoth=
er
> -lstdc++ copy (but one honoring -static-libstdc++).

Hm, and what about something like that:

diff --git a/config/bootstrap-ubsan.mk b/config/bootstrap-ubsan.mk
index 1d85fe1c836..b2a474ae158 100644
--- a/config/bootstrap-ubsan.mk
+++ b/config/bootstrap-ubsan.mk
@@ -2,7 +2,7 @@

 STAGE2_CFLAGS +=3D -fsanitize=3Dundefined -DUBSAN_BOOTSTRAP
 STAGE3_CFLAGS +=3D -fsanitize=3Dundefined -DUBSAN_BOOTSTRAP
-POSTSTAGE1_LDFLAGS +=3D -fsanitize=3Dundefined -static-libubsan -DUBSAN_BO=
OTSTRAP
\
+POSTSTAGE1_LDFLAGS +=3D -fsanitize=3Dundefined -static-libubsan -lstdc++
-DUBSAN_BOOTSTRAP \
                      -B$$r/prev-$(TARGET_SUBDIR)/libsanitizer/ \
                      -B$$r/prev-$(TARGET_SUBDIR)/libsanitizer/ubsan/ \
                      -B$$r/prev-$(TARGET_SUBDIR)/libsanitizer/ubsan/.libs=