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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/29621] librtld.os: in function `__register_frame':
 libgcc/unwind-dw2-fde.c:136: undefined reference to `malloc'
Date: Thu, 24 Nov 2022 17:27:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29621

--- Comment #19 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Arnout Vandecappelle from comment #18)
> trace-symbol points to the same libgcc object that pulls in
> __register_frame: libgcc.a(unwind-dw2-fde-dip.o)
>=20
> The question however is why unwind-dw2-fde-dip.o gets pulled in. The map
> file tells us that:
>=20
> /.../libgcc.a(unwind-dw2.o)
>                               /.../libgcc.a(_umoddi3.o) (_Unwind_Resume)
> /.../libgcc.a(unwind-dw2-fde-dip.o)
>                               /.../libgcc.a(unwind-dw2.o) (_Unwind_Find_F=
DE)
>=20
> So my guess is that the problem really is in libgcc?

It suggests that libgcc was built with -fexceptions, but without optimizati=
ons.
We can't support that on the glibc side at present. The libgcc functions we=
 use
must not have a dependency on the unwinder.

--=20
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