Building .ko from from SRPM, what reduces .ko file size between 'make' and RPM?

[David]

On Fri, Feb 27, 2009 at 5:18 PM, Kevin Kofler <kevin.kofler at chello.at> wrote:
> David wrote:
>> So I am wondering what affects the size of the .ko file between 'make'
>> and the built RPM.
>
> Debugging information is extracted into a separate RPM.

Thanks Kevin.

If I want to learn more about that, is that functionality built into
'rpmbuild' (and therefore perhaps described in its documentation), or
is it some other command?