[LLVMdev] Future of the LLVM OpenMP runtime

[Alp Toker]

On 26/02/2014 09:03, David Chisnall wrote:
> On 25 Feb 2014, at 23:13, Alp Toker <alp at nuanti.com> wrote:
>
>> Now that we've kick-started the LLVM OpenMP runtime discussion, I want to make a concrete proposal to get a test suite up and running for the LLVM OpenMP runtime. I don't think the current setup as an LLVM subproject is sustainable going forward without some form of testing support, automated or otherwise.
> I'd add that fairly high up the TODO list should probably be a build system that's a bit easier to modify.  We're very interested in getting the runtime working on FreeBSD with a view to importing it into the base system at some point in the future (we've removed the GNU OpenMP runtime and would quite like a replacement).

Some good news: We have a FreeBSD port covering both the build system 
and the OpenMP runtime itself. I'll see if we can contribute this 
upstream in the next few days.

This work generalises a few abstractions to ease porting to other 
platforms as well.

>
> Unfortunately, the current build system is a complex structure of Makefile driving Perl scripts and vice versa.  After half an hour of trying to persuade it that FreeBSD was, in fact, a valid target, I gave up.  The description of what things are valid targets is spread over multiple files with subtle interactions between them.

Agree a CMake build system is desirable. Some of the perl configure and 
generation code is ingrained and might have to stay around longer.

>
> We have a number of people producing experimental manycore 64-bit MIPS systems running FreeBSD, so we'd also be interested in doing MIPS bring-up, but the build system is currently something of a show-stopper for us.

The port is working on FreeBSD 10 x86_64 (modulo CPU affinity support) 
so MIPS shouldn't be a large leap from there, hopefully this time with 
some test coverage.
Alp.

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