Windows Cuda build is broken

[Sameer Agarwal]

Dmitry's patch 18ea7d1 broke the windows and linux build. I fixed the linux build in bea2477 which I thought would fix both builds, but the VisualStudio build is still broken.

https://github.com/ceres-solver/ceres-solver/actions/runs/6279749583/job/17055916387

and it seems to be related to not being able to find glog for the cuda kernels build target.

[Sameer Agarwal]

@sergiud can you please take a look?

[Sameer Agarwal]

cc: @DmitriyKorchemkin happy to assign this to you.

[Sameer Agarwal]

@sergiud @DmitriyKorchemkin is looking into this.

[Dmitriy Korchemkin]

I have three solutions in mind:

1. Add dependencies of ceres to ceres_cuda_kernels.
   Just adding dependencies via target_link_libraries does not resolve the problem completely (nvcc version that we have on windows does not support nested namespaces, and ContextImpl references lots of stuff via ThreadPool)
2. Move cuda-related stuff from ContextImpl into a separate structure inside ceres_cuda_kernels, and add it as a field to ContextImpl
3. Use implementation from the first version of patchset (with boolean flag instead of passing ContextImpl)

Which one makes more sense from your perspective?

[Sameer Agarwal]

I think (1) is going to be a pain.
(2) requires design, I'd rather do it in the 2.3 timeframe, and for now lets go back to (3) for now.

[Sameer Agarwal]

Fixed at head