Using VIM with Clang

I'm trying go get VIM to compile c or c++ code with Clang instead of
gcc (as I prefer the debug-output from CLang). Unfortunately I am
unable to get :make to use ClLang for compiling. So time to ask if
someone can point me in the right direction as I'm still getting to
grips with VIM:

Relevant info:
0) This is on FreeBSD stable with clang-develop from ports.
1) I've checked that compiling with clang++ from the CMD-line works as
it should.
2) Hence clang and clang++ are indeed in $PATH.
3) I've used the vimrc file as provided by the llvm project, see
https://llvm.org/svn/llvm-project/ll...tils/vim/vimrc

*) the above should have worked according to the discussion in the
llvm mailing-list here: http://markmail.org/message/mq73uxpc...+state:results
which it doesn't as it still uses gcc to compile.

4) I have subsequently set which compiler runs by typing :set
makeprg=clang++ for c++ code (I've also tried :set makeprg=clang
instead)

It clearly is using clang after this. Unfortunately it I get a strange
error-message that doesn't happen when compiling the same hello world
test-code directly from the command line. The output I get is:
---
hello:(.data+0x8): multiple definition of `__dso_handle'
/usr/lib/crtbegin.o:(.data+0x0): first defined here
hello: In function `_init':
(.init+0x0): multiple definition of `_init'
/usr/lib/crti.o:/usr/src/lib/csu/amd64/crti.S:(.init+0x0): first
defined here
hello:(.data+0x0): multiple definition of `__progname'
/usr/lib/crt1.o:(.data+0x0): first defined here
hello: In function `_start':
(.text+0x0): multiple definition of `_start'
/usr/lib/crt1.o:crt1.c:(.text+0x0): first defined here
hello: In function `_fini':
(.fini+0x0): multiple definition of `_fini'
/usr/lib/crti.o:/usr/src/lib/csu/amd64/crti.S:(.fini+0x0): first
defined here
/usr/local/bin/ld: error in hello(.eh_frame); no .eh_frame_hdr table
will be created.
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
---
Which is the point at which I'm stuck (and google doesn't help me).
I've also tried with a piece of plain c-code instead of cpp, but this
leads to the same error-message. Hopefully this error-message triggers
thoughts on what I'm doing wrong here.

For clarity both the c and cpp-code compile fine with clang directly
from the commandline. So the problem must be in the way how I call
clang from vim (using :set makeprg=clang++ or :set makeprg=clang).
Hopefully somebody knows what the correct way to do this?

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