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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: Thu, 07 Jan 2021 13:32:26 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98414

--- Comment #10 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #9)
> (In reply to Jakub Jelinek from comment #8)
> > I don't.  LIBUBSAN_SPEC comes from gcc.c, while the libstdc++ stuff com=
es
> > from cp/g++spec.c and the ordering between the two is hard to achieve, =
plus
> > it is unclear if we shouldn't for -static-libubsan instead just add ano=
ther
> > -lstdc++ copy (but one honoring -static-libstdc++).
>=20
> Hm, and what about something like that:
>=20
> 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 @@
>=20=20
>  STAGE2_CFLAGS +=3D -fsanitize=3Dundefined -DUBSAN_BOOTSTRAP
>  STAGE3_CFLAGS +=3D -fsanitize=3Dundefined -DUBSAN_BOOTSTRAP
> -POSTSTAGE1_LDFLAGS +=3D -fsanitize=3Dundefined -static-libubsan
> -DUBSAN_BOOTSTRAP \
> +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

That's not going to work:

./xgcc -B./ -B/usr/local/x86_64-pc-linux-gnu/bin/ -isystem
/usr/local/x86_64-pc-linux-gnu/include -isystem
/usr/local/x86_64-pc-linux-gnu/sys-include
-L/home/mliska/Programming/gcc/objdir/gcc/../ld -xc++ -nostdinc /dev/null -=
S -o
/dev/null -fself-test=3D../../gcc/testsuite/selftests
./cc1./cc1plus: : /usr/lib64/libstdc++.so.6/usr/lib64/libstdc++.so.6: : ver=
sion
`GLIBCXX_3.4.29' not found (required by ./cc1)version `GLIBCXX_3.4.29' not
found (required by ./cc1plus)

leaving to Nathan.=