Yes, this appears to be a typo when Fortran18 was added to the page. I've noted this error as Issue 241121.1:
https://dwarfstd.org/issues/241121.1.html I've also added Issue 241121.2 to add a DWARF 5 language code Fortran 23 and assigned DW_LANG_Fortran23 = 0x003f: https://dwarfstd.org/issues/241121.2.html We will continue adding new DW_LANG language codes as necessary at least until DWARF 6 is published, and probably for a while after that. Newly assigned DW_LANG codes are considered addenda to the spec for DWARF 5, and should be valid to use with earlier DWARF versions as well. -cary On Thu, Nov 21, 2024 at 8:40 AM Jakub Jelinek via Dwarf-discuss < dwarf-discuss@lists.dwarfstd.org> wrote: > 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 > > -- > Dwarf-discuss mailing list > Dwarf-discuss@lists.dwarfstd.org > https://lists.dwarfstd.org/mailman/listinfo/dwarf-discuss >
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