On Thu, Nov 21, 2024 at 05:22:48PM +0100, Mark Wielaard via Dwarf-discuss wrote:
> The Default Lower Bound for DW_LANG_Fortran18 on
> https://dwarfstd.org/languages.html is listed as 0.
> I cannot find a reference for Fortran 2018 changing the default lower
> bound for arrays from 1 to 0. I am a Fortran noob. But I think this
> might be a typo and it should really be 1?
23-007r1.pdf
(Fortran 2023 draft) says in 8.5.8.2:
"If no lower bound is specified in an explicit-shape-bounds-spec, all the
lower bounds are equal to one."
So yes, it should be 1, and we should have then a language code for
Fortran 2023 as well.
Although, I'm unsure if compilers really should start using these
post-DWARF5 DW_LANG_* codes, even if newer versions of consumers are
adjusted to handle those, if the compiler doesn't have guarantee it will be
only used with all those newer consumers, using say DW_LANG_C11 or
DW_LANG_C_plus_plus_14 or DW_LANG_Fortran08 for C23, C++23 or Fortran18
means it will work even with the older consumers, while switching to the new
ones means trading of some theoretical advantages (what consumers actually
care about exact C/C++/Fortran version right now) compared to making it
completely useless with older DWARF 5 compatible consumers (because it will
be an unknown language for those).
Jakub
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