What's the correct way to build this under Windows w/ MinGW?

[greatwolf]

In particular how does my build environment need to be setup to ensure cmake finds what it needs?

Here's what's setup so far:

• CMake 2.8.12.2
• Mingw-64 gcc 4.9.1
• luajit 2.1.0 built from luajit's repo
• luarocks is setup

The corresponding paths for each of the above have been added to set Path.

Problems encountered so far:

• Under mingw ssize_t is already defined under one of its headers. I fixed it by wrapping that typedef in an #ifndef guard in lib/TH/THGeneral.h.in.

• The torch7 cmake file isn't properly locating my luajit location setup. I had to manually add

  FIND_PACKAGE(Lua51 REQUIRED)
  SET(LUA_INCDIR ${LUA_INCLUDE_DIR})
  SET(LUALIB ${LUA_LIBRARIES})
  

And even then cmake couldn't locate my lua header directly. I had to manually set the LUA_INCLUDE_DIR to G:/LuaJIT-2.1.0/include/luajit-2.1.

Torch7 finally builds after making the above changes. It produced 3 targets: libtorch.dll, libTH.dll and libluaT.dll and they all reside in G:/OSS/torch7/build. It's unclear to me if the directory layout of those target outputs and intermediate files is even correct. What should a properly installed directory tree look like so that outside projects can correctly and reliably find it as a dependency?

Since I'm originally trying to get torch-threads working, let's use that as an example. Running cmake over torch-threads gives me the follow errors:

CMake Error at CMakeLists.txt:7 (find_package):
  By not providing "FindTorch.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "Torch", but
  CMake did not find one.

  Could not find a package configuration file provided by "Torch" with any of
  the following names:

    TorchConfig.cmake
    torch-config.cmake

  Add the installation prefix of "Torch" to CMAKE_PREFIX_PATH or set
  "Torch_DIR" to a directory containing one of the above files.  If "Torch"
  provides a separate development package or SDK, be sure it has been
  installed.

Now I can point Torch_DIR to some place in where TorchConfig.cmake exist but somehow that doesn't seem to be the right way to resolve things. And indeed I tried exactly that setting Torch_DIR to G:/OSS/torch7/build/cmake-exports but that only gives me more errors like:

CMake Error at G:/OSS/torch7/build/cmake-exports/TorchConfig.cmake:24 (INCLUDE):
  include could not find load file:

    TorchPathsInit

Likewise for TorchPackage, TorchWrap and others.

I'd really like to not have to play whack-a-mole with the build process. What's the right approach to ensure I can build torch and torch-threads painlessly with the environment I have?

Thanks