Base LLVM9 fails to build this port with clang crash (reported on https://bugs.llvm.org/show_bug.cgi?id=43862). The port builds when using LLVM8. Since we depend on LLVM8 anyway, use it also for compilation on elfv2.
Why do you need to specify the abi? it should be the default on elfv2.
It's not default for LLVM8 from ports.
This builds on ppcports.
OTOH do you think I should try a build of all depenent ports before we proceed? I am not sure.
This shouldn't be needed. Mesa built with base LLVM8 before.
Looks good to me. But please don't commit until you get approval by @zeising .