Re: "N" symbols and System.map

H. Peter Anvin
2009-05-02T00:00:49Z

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