Re: [PATCH v2][PR 17272] Support DWARF tags for C++11 variadic templates

[Alexandra Petlanova Hajkova <ahajkova@redhat.com>]

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On Sat, Feb 4, 2023 at 5:28 PM Ed Catmur <ed@catmur.uk> wrote:

> This patch adds support for DW_TAG_GNU_formal_parameter_pack and
> DW_TAG_GNU_template_parameter_pack, added to DWARF in March 2009 for
> C++11 variadic templates[1].
>
> They are not currently emitted thanks to a typo[2] but the fix is
> trivial[3] and has been repeatedly submitted[4] to gcc; I'm not sure
> what else I can do to get it accepted; regardless, anyone building their
> own compiler can still make use of this.
>
> This implementation synthesizes type and parameter names as T#n, p#n
> e.g. Args#1, args#1. This is a pretty simple approach but it seems to
> work OK and is compatible with the old style type and parameter names
> emitted by old versions of gcc and when it's writing stabs+ format,
> meaning that any debugger scripts will continue to work.
>
> 1. http://wiki.dwarfstd.org/index.php?title=C%2B%2B0x:_Variadic_templates
> 2. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70536
> 3. https://github.com/ecatmur/gcc/pull/5
> 4. https://gcc.gnu.org/pipermail/gcc-patches/2023-January/609659.html
> PR. https://sourceware.org/bugzilla/show_bug.cgi?id=17272
> ---
>  I think this should be accepted.
>