dtrace discuss - Dec 2008 - ERROR: ctfmerge: Cannot open output file isp for r/w: No such fil

OK, I am trying to dtrace isp(4) module in freebsd 7.

each obj file is converted using:
ctfconvert -L VERSION isp_freebsd.o

and using "ctfdump isp_freebsd.o" I can see CTF info embedded in the
.o file

but in the linked kernel module, I found much less CTF info inside it.

I guess I should use "ctfmerge" to combine the CTF info from each obj
file into the final kernel module, so I did

ctfmerge -L VERSION -o isp.ko isp.o isp_library.o ...

And I got this error:
ERROR: ctfmerge: Cannot open output file isp.ko for r/w: No such file or
directory

In source code (/usr/src/cddl/contrib/opensolaris/tools/ctf/cvt/ctfmerge.c), I
found that the outfile
must exist and read/writeable before "ctfmerge -L VERSION" cmd  is
issued.

Does this make any sense ?

Also can anybody explain what ''s the meaning of all the options for
ctfconvert and ctfmerge ?

       ctfconvert [-gis] -l label | -L labelenv [-o outfile] object_file

       ctfmerge [-fgstv] -l label | -L labelenv -o outfile file ...
       ctfmerge [-fgstv] -l label | -L labelenv -o outfile -d uniqfile
                [-g] [-D uniqlabel] file ...
       ctfmerge [-fgstv] -l label | -L labelenv -o outfile -w withfile file ...
       ctfmerge [-g] -c srcfile destfile

Thanks.
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