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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug symtab/17265] Handle DW_LNS_set_prologue_end
Date: Mon, 30 Jan 2023 13:31:29 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D17265

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vries at gcc dot gnu.org

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to dje from comment #0)
> Both gcc and clang can emit DW_LNS_set_prologue_end now.
>=20

About gcc: there two modes to generate line table info:
- -gno-as-loc-support: emit .debug_lines section contribution
- -gas-loc-support: emit .loc directives (the default)

For the first one, gcc does known about DW_LNS_set_prologue_end, and is rea=
dy
to emit it, if generated.

Likewise, for the second one, gas knows about the prologue_end option to the
.loc directive, and is ready to handle it.

But gcc doesn't seem to trigger either one of these paths.  All we have is =
the
comment in dwarf2out_source_line:
...
     ...  For Dwarf3, we ought to include the DW_LNS_set_prologue_end mark =
in
     that second line number entry.  */
...

I've filed a gcc PR about this:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108600 .

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