Re: "N" symbols and System.map

["H. Peter Anvin" <hpa@linux.intel.com>]

Sam Ravnborg wrote:
> On Sat, May 02, 2009 at 01:10:18AM +0200, Andreas Schwab wrote:
>> "H. Peter Anvin" <hpa@linux.intel.com> 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