[Dwarf-discuss] defaulting to C23 in GCC

[Mark Wielaard]

Hi Jakub,

On Wed, 2024-11-20 at 16:24 +0100, Jakub Jelinek via Dwarf-discuss
wrote:
> On Wed, Nov 20, 2024 at 03:09:02PM +0100, Alexandra Petlanova Hajkova via Dwarf-discuss wrote:
> > GCC15 (to be released in April/May2025) will default to C23 instead of the
> > C17.
> >  There is a new way to describe the language standard version used proposed
> > for DWARF6 but there is nothing like that for DWARF5 (or earlier).
> > DWARF_LANG_C23
> >  needs to be added to DWARF5.
> 
> Why?  I think we don't really want to keep adding new DW_LANG_ codes
> to the DWARF 5 set forever.
> The compiler can emit all of
>   DW_AT_language DW_LANG_C17
>   DW_AT_language_name DW_LNAME_C
>   DW_AT_language_version 202311

Note that a new DWARF5 languge code for DW_LANG_C_plus_plus_23 was
added: https://dwarfstd.org/issues/240616.1.html and several others
were added just last month https://dwarfstd.org/languages.html

But you are right we could just adopt the proposed DWARF6
DW_AT_language_name/version attributes, which is more flexible.
Question is if we think they are already "stable".
https://dwarfstd.org/languages-v6.html says "The information on this
page is part of the Draft of DWARF Version 6 and is subject to change."

Cheers,

Mark