Re: Mixing 32-bit and 64-bit DWARF2/3 sections

Mark Kettenis
2004-11-07T16:29:00Z

Date: Sun, 7 Nov 2004 10:31:44 -0500
From: Daniel Jacobowitz <drow@false.org>

On Sun, Nov 07, 2004 at 03:28:07PM +0100, Mark Kettenis wrote:
> Currently GDB barfs when you use it on an executable that contains
> compilation units that mix 32-bit and 64-bit DWARF sections. Looking
> at the (latest?) DWARF3 draft it doesn't seem to be unreasonable that
> it does so:
>
> "The 32-bit and 64-bit DWARF format conventions must not be
> intermixed within a single compilation unit."

I'd read that as saying that GDB should support what you describe.
This isn't mixing them within a single compilation unit. What falls
down?

No I'm really talking about mixing 32-bit and 64-bit DWARF format
within the same compilation unit. In the case of OpenBSD/mips64 GCC
generates a 32-bit .debug_info section and .file directives that
contain the line info. These .file directives are then converted by
gas into 64-bit .debug_line sections.

When GDB reads these it dumps core. I'm working on patches to fix
this, but I'm not yet completely satisfied with them.

Mark