[Bug c++/28946] Missing template paramater pack support

["dblaikie at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28946

David Blaikie <dblaikie at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |dblaikie at gmail dot com

--- Comment #2 from David Blaikie <dblaikie at gmail dot com> ---
+1 to this from a Clang developer.

Clang does name the template parameter pack.
```
0x0000039a:   DW_TAG_structure_type
                DW_AT_name      ("single_and_pack<int, int>")
                DW_AT_byte_size (1)
                DW_AT_decl_file
("/usr/local/google/home/blaikie/dev/scratch/test.cpp")
                DW_AT_decl_line (9)
                DW_AT_decl_column       (8)
                DW_AT_sibling   (0x000003b7)

0x000003a4:     DW_TAG_template_type_parameter
                  DW_AT_name    ("T1")
                  DW_AT_type    (0x00000094 "int")

0x000003ac:     DW_TAG_GNU_template_parameter_pack
                  DW_AT_name    ("Ts")

0x000003b0:       DW_TAG_template_type_parameter
                    DW_AT_type  (0x00000094 "int")

0x000003b5:       NULL

0x000003b6:     NULL
```

And there's an extra bonus reason from Clang's side:

I'm working on a mode for clang (called -gsimple-template-names) that will
produce DW_AT_names for templates without template parameters in some cases (so
in the above example "single_and_pack") and so working around this bug (missing
structural/API access to template parameters) by using the string name won't be
possible with debug info like this)

(total aside, though this is probably for a conversation on a gdb mailing list
- it does look like gdb does quite a bit of work that looks /a lot/ like it's
intending to support debug info like I described above... anyone happen to have
context on that?)

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