State of DTrace on FreeBSD

[Sevan / Venture37]

Hi Guys,
I started off with wanting to run postgresql on FreeBSD with DTrace 
support enabled but ran into various problems, digging further I 
discovered that the issue is not specific to Postgreqsl.

My test system was FreeBSD-CURRENT/amd64 but I went back to 8.4/i386 to 
test.

On fresh 8.4 install it's not possible to build a kernel or world 
WITH_CTF=1, build fails with WITH_CTF & WITHOUT_CTF can't both be set
On FreeBSD-CURRENT (r251249 from last Sunday), postgresql & firefox 
build --with-dtrace but probes never show up when running dtrace -l

On FreeBSD 9.1-STABLE (r250009) postgresql wouldn't build with dtrace 
support enabled.
Failing with
Assertion failed: (nrc == rc), function _libelf_resync_sections, file
/usr/src/lib/libelf/elf_update.c, line 341.
gmake: *** [utils/probes.o] Abort trap: 6 (core dumped)
gmake: *** Deleting file 'utils/probes.o'
*** [do-build] Error code 2

Previously reported here & 
http://lists.freebsd.org/pipermail/freebsd-questions/2013-May/250843.html

I was wondering what the percieved state of DTrace support was from the 
developers perspective, is this known behaviour?
Should I rais a PR to flag the postgresql port broken when attempting to 
build with dtrace support?


Sevan / Venture37