[Bug 203223] devel/llvm37: undefined references when compiling with -fopenmp=libomp

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203223

            Bug ID: 203223
           Summary: devel/llvm37: undefined references when compiling with
                    -fopenmp=libomp
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: brooks at FreeBSD.org
          Reporter: stadtkind2 at gmx.de
          Assignee: brooks at FreeBSD.org
             Flags: maintainer-feedback?(brooks at FreeBSD.org)

Hi,

I'm trying to compile a "hello world" OpenMP program, as per

http://llvm.org/releases/3.7.0/tools/clang/docs/ReleaseNotes.html#openmp-support

"OpenMP 3.1 is fully supported, but disabled by default. To enable it, please
use the -fopenmp=libomp command line option."

but all I get is (same with -fopenmp=libiomp5 and -fopenmp=libgomp):

$ clang37 -O -fopenmp=libomp omp.c  
/tmp/omp-ada729.o: In function `main':
omp.c:(.text+0xb): undefined reference to `omp_set_dynamic'
omp.c:(.text+0x10): undefined reference to `omp_get_max_threads'
omp.c:(.text+0x51): undefined reference to `__kmpc_fork_call'
/tmp/omp-ada729.o: In function `.omp_outlined.':
omp.c:(.text+0x81): undefined reference to `omp_get_thread_num'
omp.c:(.text+0xa6): undefined reference to `__kmpc_critical'
omp.c:(.text+0xbc): undefined reference to `__kmpc_end_critical'
omp.c:(.text+0xc6): undefined reference to `omp_get_num_threads'
omp.c:(.text+0xf4): undefined reference to `__kmpc_cancel_barrier'
clang-3.7: error: linker command failed with exit code 1 (use -v to see
invocation)

$ pkg info llvm37
Name           : llvm37
Version        : 3.7.0_2
Installed on   : Sun Sep 13 16:00:11 CEST 2015
Origin         : devel/llvm37
Architecture   : freebsd:10:x86:64
...
Options        :
...
        OPENMP         : on


FreeBSD 10.2/amd64, llvm37 installed via pkg install.

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