ports/183943: lang/mono port build fails with clang

[Robert]

>Number:         183943
>Category:       ports
>Synopsis:       lang/mono port build fails with clang
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Nov 14 01:40:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Robert
>Release:        FreeBSD 9.1-RELEASE-p7
>Organization:
>Environment:
FreeBSD ara-home-pc-freebsd 9.1-RELEASE-p7 FreeBSD 9.1-RELEASE-p7 #0: Mon Sep  9 21:34:37 UTC 2013     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
mono port fails to build with clang:

./.libs/libmini-static.a(libmini_static_la-mini.o): In function `mono_get_jit_tls_offset':
/usr/ports/lang/mono/work/mono-3.2.3/mono/mini/mini.c:2568: undefined reference to `mono_jit_tls'
/usr/ports/lang/mono/work/mono-3.2.3/mono/mini/mini.c:2568: undefined reference to `mono_jit_tls'
/usr/ports/lang/mono/work/mono-3.2.3/mono/mini/mini.c:2568: undefined reference to `mono_jit_tls'
/usr/ports/lang/mono/work/mono-3.2.3/mono/mini/mini.c:2568: undefined reference to `mono_jit_tls'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
gmake[4]: *** [mono-boehm] Error 1
gmake[4]: Leaving directory `/usr/ports/lang/mono/work/mono-3.2.3/mono/mini'
gmake[3]: *** [all] Error 2
gmake[3]: Leaving directory `/usr/ports/lang/mono/work/mono-3.2.3/mono/mini'
gmake[2]: *** [all-recursive] Error 1
gmake[2]: Leaving directory `/usr/ports/lang/mono/work/mono-3.2.3/mono'
gmake[1]: *** [all-recursive] Error 1
gmake[1]: Leaving directory `/usr/ports/lang/mono/work/mono-3.2.3'
gmake: *** [all] Error 2
*** [do-build] Error code 1

Stop in /usr/ports/lang/mono.

However, after commenting out clang stuff from Makefile (gcc is being used instead) - compilation succeeds.
>How-To-Repeat:
cd /usr/ports/lang/mono
make install
>Fix:
Use gcc - comment out following block in the Makefile:

.if ${OSVERSION} >= 900014 && exists(/usr/bin/clang)
CC=     /usr/bin/clang
CXX=    /usr/bin/clang++
CPP=    /usr/bin/clang-cpp
.else
BUILD_DEPENDS+= clang33:${PORTSDIR}/lang/clang33
CC=     clang33
CXX=    clang33
CPP=    clang-cpp33
.endif


>Release-Note:
>Audit-Trail:
>Unformatted: