Re: [PATCH v2 3/4] Kbuild: make DWARF version a choice

Segher Boessenkool
2020-11-24T17:51:40Z

On Tue, Nov 24, 2020 at 11:56:02AM -0500, Arvind Sankar wrote:
> On Mon, Nov 23, 2020 at 06:33:57PM -0600, Segher Boessenkool wrote:
> > On Mon, Nov 23, 2020 at 06:22:10PM -0500, Arvind Sankar wrote:
> > > Btw, is -gsplit-dwarf at all useful for assembler files?
> >
> > If you invoke the assembler via the compiler, with that flag it still
> > creates separate .o and .dwo files (via objcopy invocations as usual).
> > Whether that is useful depends on if you have any debug info that can
> > be split :-)
>
> Right, the latter was what I was really asking :) We don't currently
> pass -gsplit-dwarf for assembler and I was wondering if that mattered.

If there is any debug info in the .s files, it will all end up in the .o
file, not a .dwo file. That may matter aesthetically, and it can cost a
few bytes of disk space, but it doesn't matter functionally (GDB will
search in both places).

Segher