[Bug ipa/87957] [9 Regression] ICE tree check: expected tree that contains ‘decl minimal’ structure, have ‘identifier_node’ in warn_odr, at ipa-devirt.c:1051 since r265519

[hubicka at ucw dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87957

--- Comment #28 from Jan Hubicka <hubicka at ucw dot cz> ---
> > I already did printf debugging and indeed we only need to decide how to
> > adjust type_with_linkage_p so it returns false for all Ada types.  Maybe
> > cleanest would be to add flag to TYPE_DECL which C++ FE will set and
> > other frontends won't, but perhaps there is easier way around. Jason?
> 
> What does it mean exactly for a type to have or not have a linkage?

Types with linkage are C++ ODR types. They have associated mangled name
(which is after free lang data available by DECL_ASSEMBLER_NAME of
the TYPE_DECL of TYPE_NAME) and if the names match in different units,
one knows that they are same types even if tree representation diverges.

In C++ those are records, unions and enums.

Honza