Re: "N" symbols and System.map

[H. Peter Anvin]

Sam Ravnborg wrote:
> On Sat, May 02, 2009 at 01:10:18AM +0200, Andreas Schwab wrote:
> > "H. Peter Anvin" <hpa@xxxxxxxxxxxxxxx> writes:
> >
> > > right now, we filter out symbols that nm tag N, meaning "debugging
> > > symbols", from System.map.  However, at least on x86, the linker-generated
> > > symbol _end is tagged N, and in fact is the only N in the entire image.
> > >
> > > Are there other architectures which would suffer if N were included in
> > > System.map, or would that be a reasonable thing to do?
> > There should not be any N symbols unless you are using stabs debugging.
>
> We have in vmlinux:
>         .end : AT(ADDR(.end) - LOAD_OFFSET) {
>                 _end = .;
>         }
>
>
> And I see:
> c1834000 N _end
>
> This is the _only_ 'N' symbol in my vmlinux.

Yup, this is what happens.  I don't know why the linker does this, and 
if there is a way around it.

	-hpa

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