Add MATLAB support with the CMake build on windows

[willyd]

Current CMakeLists.txt disables the MATLAB support. Need to change:

caffe_option(BUILD_matlab "Build Matlab wrapper" OFF IF UNIX OR APPLE OR WIN32)

FindMatlabMex.cmake fails to find mex.bat on Windows. CMake added the matlab_add_mex in the FindMatlab.cmake maybe we can use this Find module instead on windows?

[lunzueta]

Hi @willyd. I already have experience in compiling matcaffe in previous Caffe versions for Windows. I'm currently trying to solve this issue with CMake in my local repo. What I'm trying to do is a custom finder and linker of the required Matlab files (I don't think that using FindMatlab.cmake is a good idea in this case, which I've also tried). Hopefully, during this week I'll be able to give you an update on this (I mean, a PR).

[willyd]

@lunzueta In one of my previous PRs I actually had MATLAB working using the FindMatlab.cmake module you can check it out there: https://github.com/willyd/caffe/tree/msvc

I believe all the MATLAB related changes were done in this commit: https://github.com/willyd/caffe/tree/cbbd3a7d00d04bc7a536a969d9e1c3730f4c3fe6.

The most relevant files I believe were:

• https://github.com/willyd/caffe/blob/msvc/matlab/CMakeLists.txt
• https://github.com/willyd/caffe/blob/msvc/cmake/Dependencies.cmake
• https://github.com/willyd/caffe/blob/msvc/cmake/Modules/FindMatlab.cmake

Hopefully, during this week I'll be able to give you an update on this (I mean, a PR).

I will wait for your feedback then.

[lunzueta]

OK @willyd, I didn't try that one, so I'll compare and test both approaches and if in the end what I'm trying to do has something that can benefit the community, I'll send the PR, otherwise, it wouldn't make too much sense to do so :-P

[lunzueta]

@willyd, your approach is clearer and simpler than what I was trying to do, so I'd definitively go for it. I've already submitted a PR (#4928) where I handpicked some lines from some cmake files of your msvc branch. I also updated the README.md file. I was able to run classification_demo.m correctly in Matlab 2014b with the generated .mexw64 file.

[willyd]

@lunzueta Thanks a lot! I believe that there are are some tests in the MATLAB package are you able to run them?

I will review the PR and get back to you.

[lunzueta]

@willyd Yes, I'm able to run successfully the run_tests.m script included in the MATLAB package.