CUDA 9.1

[Lumin]

> 9.1 is supposed to support llvm-4.0, so it may be an alternative to
> gcc-6 ... I haven't tested it and I'm not sure whether llvm-4.0 will
> stay around for buster ...

I can locally build caffe-contrib with clang-4.0 + CUDA 9.1 without code change.
(except the two lines in rules switching from gcc to clang)

Clang's version bumps so fast. The newest clang in the archive is 7, while
the oldest is 3.8 .

$ apt list clang\*

-- 
Best,