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From: "iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug ipa/99466] internal compiler error: in
 function_and_variable_visibility, at ipa-visibility.c:795
Date: Tue, 16 Mar 2021 14:19:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99466

--- Comment #6 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Iain Buclaw from comment #5)
> (In reply to Iain Sandoe from comment #4)
> > (In reply to Iain Buclaw from comment #3)
> > > Oldest compiler version have tried it one is 8.4.0, and there's an IC=
E there
> > > as well.
> >=20
> > On Darwin16 : ICE back to 5.5, at least (probably, it never worked - I =
will
> > see if can find a 4.x compiler on an older box)
> >=20
> > I don't see any specific reason for this to be "waiting" now.
> The system installed compiler (4.2.1) errors with "thread-local storage n=
ot
> supported for this target", so yes, I think you're right.

emuTLS was introduced sometime in 4.x (RTH made the implementation), it did=
 not
exist for Apple-4.x, native TLS was introduced in clang for Darwin11 (but we
don't have that for GCC, yet - with an open PR for that).

for the record the emuTLS test ICEs back to at least 4.6.4 on Darwin9.

Given that this is ice-on-valid, IMO we should consider fixing on the open
branches.=