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From: "mathieu.malaterre at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103629] Possible miscompilation triggered by
 -fvisibility=hidden
Date: Thu, 09 Dec 2021 14:03:01 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103629

--- Comment #5 from Mathieu Malaterre <mathieu.malaterre at gmail dot com> =
---
(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 rea=
dy
> for it.

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:

* https://gcc.gnu.org/gcc-11/changes.html

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

*
https://salsa.debian.org/multimedia-team/openvdb/-/blob/debian/3.0.0-1/debi=
an/rules#L14-15=