DTrace and clang -- ERROR: ctfmerge: kernel.debug: Cannot get sect .note.GNU-stack data

[Kostik Belousov]

On Wed, Dec 01, 2010 at 11:48:10AM -0600, Brandon Gooch wrote:
> I recently attempted to enable DTrace on a system running HEAD built
> with clang, and saw this error scrolling by when the kernel and
> modules were being built:
> 
> ERROR: ctfmerge: kernel.debug: Cannot get sect .note.GNU-stack data
> 
> Each module being built also displayed a similar message as to the above.
> 
> ERROR: ctfmerge: module_name: Cannot get sect .note.GNU-stack data
> 
> I've followed instructions here for building with clang:
> 
> http://wiki.freebsd.org/BuildingFreeBSDWithClang
> 
> ...and here for DTrace:
> 
> http://wiki.freebsd.org/DTrace
> 
> I've completed several rounds of building world and kernel from SVN
> r216082 to r216095. Each time, it seems that kernel in world aren't
> "in sync"
> 
> # netstat
> netstat: no namelist
> 
> I can build the kernel using gcc, and DTrace (and netstat) output is
> good. I haven't rebuilt world yet with gcc, as it takes a while, but
> I'll certainly be doing that at some point I'm sure :)
> 
> Any debugging hints appreciated...

What is the revision of sources used to build the _installed_ version
of libelf.so ? Make sure that it contains r210324.

I am unable to reproduce your problem with gcc/WITH_CTF=1, where gcc
config is changed to emit .note.GNU-stack marker sections, similar to
clang config.
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