llvm-3.7 release and OpenMP

[Jeremy Huddleston Sequoia]

Looks good to me.  Could you go ahead and push this to svn and also do similar changes to the llvm-3.8 port for your openmp variant?

Thanks,
Jeremy

> On Sep 2, 2015, at 15:34, Eric A. Borisch <eborisch at macports.org> wrote:
> 
> Would have done a ticket, but with trac down....
> 
> Attached is a patch to update to the released llvm/clang-3.7 (this comments out the svn fetch code, removes the default +assertions, and adds checksums)
> 
> As OpenMP is one of the much discussed items that llvm-3.7 brings to the table, I've added a +openmp variant to clang-3.7. This variants pulls in port:libomp and sets up clang such that "-fopenmp" will use it by default. This makes it much more likely for tools like autoconf to detect OpenMP support. (Without the variant, openmp support is still there, but it requires -fopenmp=libomp, which isn't in the set of standard "can we do OpenMP" flags.) If people are supportive of it, I would suggest making it a default variant.
> 
> Note that -I/opt/local/include and -L/opt/local/lib (assuming standard MacPorts install location) are required with -fopenmp for things to work and not complain about missing omp.h or -lomp.
> 
> If there is someone more familiar with clang/llvm building (of the tools themselves), it might be interesting to consider baking in those -I/-L flags (or move the libomp include/lib install directories so they only have omp.h and the libomp*.dylib files and using those) so -fopenmp would "just work." (Without the extra -I and -L)... Let me know if there is interest and I can rework the libomp port to support this.
> 
> Thanks,
>   - Eric
> <llvm-3.7.patch>