Example doesn't work in 0.6/OS X

[dlfivefifty]

I tried running the example but get:

julia> c = a * b # calls to BLAS
ERROR: MethodError: no method matching blas_module(::GPUArrays.CLBackend.CLContext)
Closest candidates are:
  blas_module(::GPUArrays.JLBackend.JLContext) at /Users/solver/.julia/v0.6/GPUArrays/src/backends/julia/julia.jl:81
  blas_module(::Union{GPUArrays.AbstractAccArray{T,1}, GPUArrays.AbstractAccArray{T,2}} where T) at /Users/solver/.julia/v0.6/GPUArrays/src/backends/blas.jl:4
Stacktrace:
 [1] gemm! at /Users/solver/.julia/v0.6/GPUArrays/src/backends/blas.jl:20 [inlined]
 [2] gemm_wrapper!(::GPUArrays.GPUArray{Float32,2,OpenCL.cl.Buffer{Float32},GPUArrays.CLBackend.CLContext}, ::Char, ::Char, ::GPUArrays.GPUArray{Float32,2,OpenCL.cl.Buffer{Float32},GPUArrays.CLBackend.CLContext}, ::GPUArrays.GPUArray{Float32,2,OpenCL.cl.Buffer{Float32},GPUArrays.CLBackend.CLContext}) at ./linalg/matmul.jl:369
 [3] *(::GPUArrays.GPUArray{Float32,2,OpenCL.cl.Buffer{Float32},GPUArrays.CLBackend.CLContext}, ::GPUArrays.GPUArray{Float32,2,OpenCL.cl.Buffer{Float32},GPUArrays.CLBackend.CLContext}) at ./linalg/matmul.jl:148

julia> versioninfo()
Julia Version 0.6.0-pre.beta.9
Commit ceb06740e3 (2017-04-02 01:04 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin16.4.0)
  CPU: Intel(R) Core(TM) i7-3820QM CPU @ 2.70GHz
  WORD_SIZE: 64
  BLAS: libgfortblas
  LAPACK: liblapack
  LIBM: libopenlibm
  LLVM: libLLVM-3.9.1 (ORCJIT, ivybridge)

[dlfivefifty]

There were build errors for CLART.jl which may be causing this....

[SimonDanisch]

CLBLAS you mean? CLBLAS on osx doesn't have precompiled binaries, so you need to compile it yourself :( checkout: https://github.com/clMathLibraries/clBLAS
Maybe we can set up a compile script with bindeps for CLBLAS though!

[vchuravy]

I think we could use Bindeps with brew clMathLibraries/clBLAS#123, but I don't have access to a Mac.

[SimonDanisch]

Even easier :)

[dlfivefifty]

Hmm, I have brew install clblas, but I still get:

julia> Pkg.build("CLBLAS")
INFO: Building CLBLAS
===============================[ ERROR: CLBLAS ]================================

LoadError:     OSX not oficially supported.
    Find manual build instructions on: https://github.com/clMathLibraries/clBLAS/wiki/Build

while loading /Users/solver/.julia/v0.6/CLBLAS/deps/build.jl, in expression starting on line 38

Also, the website link is not right...

[vchuravy]

Can you open an issue with https://github.com/JuliaGPU/CLBLAS.jl?

[dlfivefifty]

JuliaGPU/CLBLAS.jl#33