https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113208
--- 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 = 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) Referring: Function flags: Called by: _Z41__static_initialization_and_destruction_0v/8 (can throw external) Calls: and in t1 we have _ZN6vectorI12QualityValueEC1ERKS1_/2 (constexpr vector<_Tp>::vector(const vector<_Tp>&) [with _Tp = QualityValue]) Type: function definition Visibility: semantic_interposition external public weak comdat comdat_group:_ZN6vectorI12QualityValueEC1ERKS1_ one_only References: Referring: Function flags: Called by: Calls: This is the same symbol name but in two different comdat groups (C1 compared to C5). With -O0 both seems to get the C5 group I can silence the ICE by making aliases undefined during symbol merging (which is kind of hack but should make sanity checks happy), but I am still lost how this is supposed to work in valid code.
