[Bug libgcc/109054] _Unwind_GetLanguageSpecificData should have protected visibility

["jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109054

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jakub at gcc dot gnu.org

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Protected visibility is always wrong, it is broken by design (or lack thereof).
The _Unwind_* APIs are required by the Itanium ABI, and we call various other
such functions from libgcc code already (e.g. _Unwind_Find_FDE from
_Unwind_FindEnclosingFunction and uw_frame_state_for and others,
_Unwind_GetTextRelBase, _Unwind_GetRegionStart,
_Unwind_GetDataRelBase, _Unwind_SetGR, _Unwind_SetIP, _Unwind_GetIPInfo and
_Unwind_GetCFA from various spots, _Unwind_RaiseException from
_Unwind_Resume_or_Rethrow
etc.).
It is IMHO very bad idea to have 2 different unwinders in the same process with
the same exported functions.
If you'd like libgcc to call local aliases of these functions instead of those
functions, I'm afraid it could break various things, e.g. i?86 glibc exports
_Unwind_Find_FDE too and we rely on a single registry for all unwinding.