Conditional load of OpenCL.jl

[klkeys]

Is it possible to conditionally load OpenCL depending on whether or not Julia can find an OpenCL library? For Unix systems, I thought that I could imitate what appears in api.jl:

module MyMulticoreModule

using LotsOfCPUPackages

### only load OpenCL.jl if the library is found
const libopencl = Libdl.find_library(["libOpenCL", "OpenCL"])
if libopencl == ""
    warn("cannot find OpenCL library!")
else
     using OpenCL
end

include("my_cpu_code.jl")

### same deal
if libopencl != ""
    include("my_gpu_code.jl")
end

end

[klkeys]

Perhaps not? This idea is covered in issues #6195 and #15705 in Julia Base. It appears that some problems include recompilation of the module and a revamp of type stability inference.

[juliohm]

@klkeys I am doing a simple trick to optionally load OpenCL in my package: https://github.com/juliohm/ImageQuilting.jl/blob/master/src/ImageQuilting.jl#L28-L32

In that case, before every use of the GPU, I check if cl is nothing or not. It has worked for me, but it may not be worth for you, I don't know.

[klkeys]

@juliohm it seems to work in my case. Thank you for the workaround!

[juliohm]

We are now using OpenCL_jll to install the dependency on the platform.