[mobile] add buck build for mobile targets (pytorch#76480)

Create buck targets to replicate internal BUCK build, including
- XNNPACK
- QNNPACK
- C10
- aten_cpu
- torch_mobile_core
- torch_mobile_all_ops
- ptmobile_benchmark

And able to run mobilenet v2 using ptmobile_benchmark (with all ops).
Pull Request resolved: pytorch#76480
Approved by: https://github.com/seemethere, https://github.com/dreiss

.buckconfig.oss

@@ -0,0 +1,15 @@
+[buildfile]
+name = BUILD.buck
+
+[repositories]
+  bazel_skylib = third_party/bazel-skylib/
+
+[download]
+  in_build = true
+
+[cxx]
+  cxxflags = -std=c++17
+  should_remap_host_platform = true
+
+[project]
+  default_flavors_mode=all

.github/workflows/buck_build_test.yml

@@ -63,7 +63,54 @@ jobs:
           wget https://github.com/facebook/buck/releases/download/v2021.01.12.01/buck.2021.01.12.01_all.deb
           sudo apt install ./buck.2021.01.12.01_all.deb
 
-      - name: Build Buck target
+      - name: Download third party libraries and generate wrappers
         run: |
-          echo -e "[buildfile]\n  name = BUILD.buck\n" > .buckconfig
-          buck build --keep-going //third_party:
+          sh scripts/buck_setup.sh
+
+      - name: Build glog
+        run: |
+          buck build third_party:glog
+
+      - name: Build C10
+        run: |
+          buck build c10:c10
+
+      - name: Build cpuinfo
+        run: |
+          buck build third_party:cpuinfo
+
+      - name: Build pthreadpool
+        run: |
+          buck build third_party:pthreadpool
+
+      - name: Build XNNPACK
+        run: |
+          buck build third_party:XNNPACK
+
+      - name: Build QNNPACK
+        run: |
+          buck build aten/src/ATen/native/quantized/cpu/qnnpack/... --keep-going
+
+      - name: Build aten_cpu
+        run: |
+          buck build :aten_cpu
+
+      - name: Build torch_mobile_core
+        run: |
+          buck build :torch_mobile_core
+
+      - name: Build torch_mobile_all_ops
+        run: |
+          buck build :torch_mobile_all_ops
+
+      - name: Build mobile benchmark
+        run: |
+          buck build :ptmobile_benchmark
+
+      - name: Run lite interpreter model
+        run: |
+          buck run :ptmobile_benchmark -- --model=ios/TestApp/models/mobilenet_v2.ptl --input_dims=1,3,224,224 --input_type=float
+
+      - name: Build everything
+        run: |
+          buck build //... --keep-going

.gitignore

@@ -325,3 +325,7 @@ pr.diff
 .lsp-buck-out/
 .lsp.buckd/
 buck-out/
+
+# Downloaded libraries
+third_party/ruy/
+third_party/glog/

.lintrunner.toml

@@ -144,6 +144,10 @@ include_patterns = [
     'torch/utils/benchmark/utils/timer.py',
     'torch/utils/benchmark/utils/valgrind_wrapper/**/*.py',
 ]
+exclude_patterns = [
+    # (linbinyu) copied from internal repo
+    'tools/code_analyzer/gen_operators_yaml.py',
+]
 command = [
     'python3',
     'tools/linter/adapters/mypy_linter.py',