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Added explicit build command for Windows and clarification on obtaining (#70190)

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Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/70190

C++ build tools to readme.md

Test Plan: Imported from OSS

Reviewed By: jbschlosser

Differential Revision: D33245438

Pulled By: ikriv

fbshipit-source-id: ef863d68926bd7416d0e10d24197d19392c124de
This commit is contained in:
Ivan Krivyakov
2022-01-03 14:32:38 -08:00
committed by Facebook GitHub Bot
parent 1e67570f3a
commit bc3246453b
1 changed files with 9 additions and 1 deletions
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README.md
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@@ -262,13 +262,21 @@ Choose Correct Visual Studio Version.
Sometimes there are regressions in new versions of Visual Studio, so
it's best to use the same Visual Studio Version [16.8.5](https://github.com/pytorch/pytorch/blob/master/.circleci/scripts/vs_install.ps1) as Pytorch CI's.
You can use Visual Studio Enterprise, Professional or Community though PyTorch CI uses Visual Studio BuildTools.
PyTorch CI uses Visual C++ BuildTools, which come with Visual Studio Enterprise,
Professional, or Community Editions. You can also install the build tools from
https://visualstudio.microsoft.com/visual-cpp-build-tools/. The build tools *do not*
come with Visual Studio Code by default.
If you want to build legacy python code, please refer to [Building on legacy code and CUDA](https://github.com/pytorch/pytorch/blob/master/CONTRIBUTING.md#building-on-legacy-code-and-cuda)
Build with CPU
It's fairly easy to build with CPU.
```cmd
conda activate
python setup.py install
```
Note on OpenMP: The desired OpenMP implementation is Intel OpenMP (iomp). In order to link against iomp, you'll need to manually download the library and set up the building environment by tweaking `CMAKE_INCLUDE_PATH` and `LIB`. The instruction [here](https://github.com/pytorch/pytorch/blob/master/docs/source/notes/windows.rst#building-from-source) is an example for setting up both MKL and Intel OpenMP. Without these configurations for CMake, Microsoft Visual C OpenMP runtime (vcomp) will be used.