Simplify SDK tutorial by moving cmake commands to a script (#3438) (#3492)

Summary:
As titled. Tested the commands on mac locally and they worked.

Pull Request resolved: #3438

Reviewed By: Jack-Khuu

Differential Revision: D56792240

Pulled By: Olivia-liu

fbshipit-source-id: dd62ea2fc788c5e1867d1e50037d7b4fd7e3a3f9
(cherry picked from commit a4ffd96)

Co-authored-by: Olivia Liu <[email protected]>
Co-authored-by: Peixuan Liu <[email protected]>

Author: pytorchbot

docs/source/tutorials_source/sdk-integration-tutorial.py

@@ -172,24 +172,8 @@ def forward(self, x):
 # Use CMake (follow `these instructions <../runtime-build-and-cross-compilation.html#configure-the-cmake-build>`__ to set up cmake) to execute the Bundled Program to generate the ``ETDump``::
 #
 #       cd executorch
-#       rm -rf cmake-out
-#       cmake -DCMAKE_INSTALL_PREFIX=cmake-out \
-#           -DCMAKE_BUILD_TYPE=Release \
-#           -DEXECUTORCH_BUILD_SDK=ON \
-#           -DEXECUTORCH_ENABLE_EVENT_TRACER=ON \
-#           -Bcmake-out .
-#       cmake --build cmake-out -j9 --target install --config Release
-#
-#       local example_dir=examples/sdk
-#       local build_dir=cmake-out/${example_dir}
-#       CMAKE_PREFIX_PATH="${PWD}/cmake-out/lib/cmake/ExecuTorch;${PWD}/cmake-out/third-party/gflags"
-#       rm -rf ${build_dir}
-#       cmake -DCMAKE_PREFIX_PATH="$CMAKE_PREFIX_PATH" \
-#           -DCMAKE_BUILD_TYPE=Release \
-#           -B${build_dir} \
-#           ${example_dir}
-#       cmake --build ${build_dir} -j9 --config Release
-#       ${build_dir}/sdk_example_runner --bundled_program_path="bundled_program.bp"
+#       ./examples/sdk/build_sdk_example_runner.sh
+#       cmake-out/examples/sdk/sdk_example_runner --bundled_program_path="bundled_program.bp"
 
 ######################################################################
 # Creating an Inspector

examples/sdk/build_sdk_example_runner.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+# Builds sdk_example_runner and prints its path.
+
+set -euo pipefail
+
+SCRIPT_DIR="$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+readonly SCRIPT_DIR
+
+readonly EXECUTORCH_ROOT="${SCRIPT_DIR}/../.."
+
+# Allow overriding the number of build jobs. Default to 9.
+export CMAKE_BUILD_PARALLEL_LEVEL="${CMAKE_BUILD_PARALLEL_LEVEL:-9}"
+
+main() {
+  cd "${EXECUTORCH_ROOT}"
+
+  rm -rf cmake-out
+  cmake -DCMAKE_INSTALL_PREFIX=cmake-out \
+      -DCMAKE_BUILD_TYPE=Release \
+      -DEXECUTORCH_BUILD_SDK=ON \
+      -DEXECUTORCH_ENABLE_EVENT_TRACER=ON \
+      -Bcmake-out .
+  cmake --build cmake-out --target install --config Release
+
+  local example_dir=examples/sdk
+  local build_dir="cmake-out/${example_dir}"
+  local cmake_prefix_path="${PWD}/cmake-out/lib/cmake/ExecuTorch;${PWD}/cmake-out/third-party/gflags"
+  rm -rf ${build_dir}
+  cmake -DCMAKE_PREFIX_PATH="${cmake_prefix_path}" \
+      -DCMAKE_BUILD_TYPE=Release \
+      -B"${build_dir}" \
+      "${example_dir}"
+  cmake --build "${build_dir}" --config Release
+
+  local runner="${PWD}/${build_dir}/sdk_example_runner"
+  if [[ ! -f "${runner}" ]]; then
+    echo "ERROR: Failed to build ${build_dir}/sdk_example_runner" >&2
+    exit 1
+  else
+    echo "Built ${build_dir}/sdk_example_runner"
+  fi
+}
+
+main "$@"