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From: "hubicka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/113208] [14 Regression] lto1: error: Alias and target's
 comdat groups differs since r14-5979-g99d114c15523e0
Date: Mon, 15 Apr 2024 17:15:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113208

--- Comment #28 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
So the main problem is that in t2 we have

_ZN6vectorI12QualityValueEC1ERKS1_/7 (vector<_Tp>::vector(const vector<_Tp>=
&)
[with _Tp =3D QualityValue])
  Type: function definition analyzed alias cpp_implicit_alias
  Visibility: semantic_interposition public weak comdat
comdat_group:_ZN6vectorI12QualityValueEC5ERKS1_ one_only
  Same comdat group as: _ZN6vectorI12QualityValueEC2ERKS1_/6
  References: _ZN6vectorI12QualityValueEC2ERKS1_/6 (alias)=20
  Referring:=20
  Function flags:
  Called by: _Z41__static_initialization_and_destruction_0v/8 (can throw
external)
  Calls:=20

and in t1 we have

_ZN6vectorI12QualityValueEC1ERKS1_/2 (constexpr vector<_Tp>::vector(const
vector<_Tp>&) [with _Tp =3D QualityValue])
  Type: function definition
  Visibility: semantic_interposition external public weak comdat
comdat_group:_ZN6vectorI12QualityValueEC1ERKS1_ one_only
  References:=20
  Referring:
  Function flags:
  Called by:=20
  Calls:=20

This is the same symbol name but in two different comdat groups (C1 compare=
d to
C5).  With -O0 both seems to get the C5 group

I can silence the ICE by making aliases undefined during symbol merging (wh=
ich
is kind of hack but should make sanity checks happy), but I am still lost h=
ow
this is supposed to work in valid code.=