[Bug runtime/17696] Systemtap fails to find kernel tracepoints when kernel is built in a separate directory from source tree

["jistone at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17696

--- Comment #3 from Josh Stone <jistone at redhat dot com> ---
(In reply to Zhuo QL from comment #2)
> Thanks for your work, it works well with the debian system provided kernel!

And thank your for testing!

> But, it still does not work with my self-built kernel(built with a seperate
> KBUILD_OUTPUT).
> 
> I read the lines around your commit and some logs, then found line 11132 of
> tapsets.cxx: 
> 
> const char* name = dwarf_formstring (dwarf_attr (cudie, DW_AT_comp_dir, &attr));
> 
> Here we still get the dir to /lib/modules/${uname -r}/build  under this
> situation.

Ah, I see.  I think it would be better in this case if we avoid using the
DW_AT_comp_dir at all when it is equal to the known s.kernel_build_tree.  I'll
attach a patch to this effect.

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