[PATCH] as: Automatically enable DWARF5 support

[H.J. Lu]

On Sat, Jan 16, 2021 at 10:11 PM Fangrui Song <i@maskray.me> wrote:
>
> On 2021-01-16, H.J. Lu via Binutils wrote:
> >Currently
> >
> >$ as -o x.o x.s
> >
> >fails when x.s contains DWARF5 info.  Add a .dwarf_level directive to
> >set the DWARF level and GCC can emit ".dwarf_level 5" when generating
> >DWARF5 info so that
> >
> >$ gcc -S -g -c x.c
> >$ gcc -c x.s
> >
> >works.
>
> The problem is file number 0 in .file and .loc directives.  An alternative
> design is to detect number 0 and upgrade to DWARF v5 line tables automatically.
>
> If we decide to add a new directive, .dwarf_version is better than .dwarf_level .
> The DWARF specifications don't use the term "level".

How about this patch to automatically enable DWARF5 support?

-- 
H.J.
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