[Lldb-commits] [lldb] [lldb] Fix StdUnorderedMapSynthProvider for GCC (PR #164251)

[David Blaikie via lldb-commits]

dwblaikie wrote:

Oh, yeah, GCC doesn't produce DW_TAG_template_type_parameter for unnamed template type parameters - yeah, it'd be a valid size optimization for them (relying on the uniqueness/identity of the DW_AT_name, I guess, for any type equivalence checking) - anything that can pull in more types into DWARF can be quite expensive (pulling in a whole type subgraph) so I could totally believe they did this for size optimization reasons.

We (Clang/LLVM) don't put any DW_TAG_template_type_parameters on (non-defining) declarations of template entities - except on SCE and when using Simplified Template Names. But we do put them all on for definitions, whether or not they're named/used.

https://github.com/llvm/llvm-project/pull/164251