1This `./upstream` subfolder contains fixes for `FindCUDA` that are introduced in 2later versions of cmake but cause generator expression errors in earlier CMake 3versions. Specifically: 4 51. a problem where a generator expression for include directories was 6passed to NVCC, where the generator expression itself was prefixed by `-I`. 7As the NNPACK include directory generator expression expands to multiple 8directories, the second and later ones were not prefixed by `-I`, causing 9NVCC to return an error. First fixed in CMake 3.7 (see 10[Kitware/CMake@7ded655f](https://github.com/Kitware/CMake/commit/7ded655f)). 11 122. Windows VS2017 fixes that allows one to define the ccbin path 13differently between earlier versions of Visual Studio and VS2017. First 14introduced after 3.10.1 master version (see 15[Kitware/CMake@bc88329e](https://github.com/Kitware/CMake/commit/bc88329e)). 16 17The downside of using these fixes is that `./upstream/CMakeInitializeConfigs.cmake`, 18defining some new CMake variables (added in 19[Kitware/CMake@48f7e2d3](https://github.com/Kitware/CMake/commit/48f7e2d3)), 20must be included before `./upstream/FindCUDA.cmake` to support older CMake 21versions. A wrapper `./FindCUDA.cmake` is created to do this automatically, and 22to allow submodules to use these fixes because we can't patch their 23`CMakeList.txt`. 24 25If you need to update files under `./upstream` folder, we recommend you issue PRs 26against [the CMake mainline branch](https://gitlab.kitware.com/cmake/cmake/tree/master/Modules/FindCUDA.cmake), 27and then backport it here for earlier CMake compatibility. 28