Document `torch.utils.cmake_prefix_path` (#38727)
Summary:
Documents new global variable pointing to PyTorch CMake config files
Pull Request resolved: https://github.com/pytorch/pytorch/pull/38727
Differential Revision: D21694243
Pulled By: malfet
fbshipit-source-id: 652532cd5da9945caf7d7dfe1fde696dc474661b
diff --git a/docs/cpp/source/installing.rst b/docs/cpp/source/installing.rst
index c93015f..35eb3f0 100644
--- a/docs/cpp/source/installing.rst
+++ b/docs/cpp/source/installing.rst
@@ -89,7 +89,13 @@
cmake --build . --config Release
where ``/absolute/path/to/libtorch`` should be the absolute (!) path to the unzipped LibTorch
-distribution. If all goes well, it will look something like this:
+distribution. If PyTorch was installed via conda or pip, `CMAKE_PREFIX_PATH` can be queried
+using `torch.utils.cmake_prefix_path` variable. In that case CMake configuration step would look something like follows:
+
+.. code-block:: sh
+ cmake -DCMAKE_PREFIX_PATH=`python -c 'import torch;print(torch.utils.cmake_prefix_path)'`
+
+If all goes well, it will look something like this:
.. code-block:: sh
