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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103629] Possible miscompilation triggered by
 -fvisibility=hidden
Date: Thu, 09 Dec 2021 14:15:39 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103629

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Mathieu Malaterre from comment #5)
> (In reply to Andrew Pinski from comment #4)
> > (In reply to Mathieu Malaterre from comment #3)
> > > $ export CXXFLAGS=3D-fvisibility=3Dhidden
> >=20
> > Yes you can't just use -fvisibility=3Dhidden without the source being r=
eady
> > for it.
>=20
> Andrew, could you please be a bit more specific. I do not see any changes
> related to duplicate `typeinfo` or `visibility=3Dhidden` in the changelog:
>=20
> * https://gcc.gnu.org/gcc-11/changes.html

right there has been no major changes in this area as far as I Know.=20

>=20
> `-fvisibility=3Dhidden` was added in 2015 in the Debian/OpenVDB package a=
nd
> has worked quite well for all users so far. It would be nice if gcc/ld wo=
uld
> help track any `type_info` issue, in large portable c++ codebase.

It was working by accident before. Do you know why it was added? Has the co=
de
upstream in OpenVDB been fixed for adding the visibility attribute where
needed?=