Remove caffe2 mobile (pytorch#84338)

We're no longer building Caffe2 mobile as part of our CI, and it adds a lot of clutter to our make files. Any lingering internal dependencies will use the buck build and so wont be effected.
Pull Request resolved: pytorch#84338
Approved by: https://github.com/dreiss

CMakeLists.txt

@@ -165,9 +165,6 @@ option(BUILD_LITE_INTERPRETER "Master flag to build Lite Interpreter" OFF)
 cmake_dependent_option(
     BUILD_CAFFE2_OPS "Build Caffe2 operators" ON
     "BUILD_CAFFE2" OFF)
-cmake_dependent_option(
-    BUILD_CAFFE2_MOBILE "Build libcaffe2 for mobile (deprecating)" OFF
-    "BUILD_CAFFE2" OFF)
 option(BUILD_SHARED_LIBS "Build libcaffe2.so" ON)
 cmake_dependent_option(
     CAFFE2_LINK_LOCAL_PROTOBUF "If set, build protobuf inside libcaffe2.so." ON
@@ -591,18 +588,11 @@ if(ANDROID OR IOS OR DEFINED ENV{BUILD_PYTORCH_MOBILE_WITH_HOST_TOOLCHAIN})
 endif()
 
 # INTERN_BUILD_ATEN_OPS is used to control whether to build ATen/TH operators.
-# It's disabled for caffe2 mobile library.
-if(INTERN_BUILD_MOBILE AND BUILD_CAFFE2_MOBILE)
-  set(INTERN_BUILD_ATEN_OPS OFF)
-else()
-  set(INTERN_BUILD_ATEN_OPS ON)
-endif()
+set(INTERN_BUILD_ATEN_OPS ON)
 
-# BUILD_CAFFE2_MOBILE is the master switch to choose between libcaffe2 v.s. libtorch mobile build.
-# When it's enabled it builds original libcaffe2 mobile library without ATen/TH ops nor TorchScript support;
-# When it's disabled it builds libtorch mobile library, which contains ATen/TH ops and native support for
+# Build libtorch mobile library, which contains ATen/TH ops and native support for
 # TorchScript model, but doesn't contain not-yet-unified caffe2 ops;
-if(INTERN_BUILD_MOBILE AND NOT BUILD_CAFFE2_MOBILE)
+if(INTERN_BUILD_MOBILE)
   if(NOT BUILD_SHARED_LIBS AND NOT "${SELECTED_OP_LIST}" STREQUAL "")
     string(APPEND CMAKE_CXX_FLAGS " -DNO_EXPORT")
   endif()

CONTRIBUTING.md

@@ -1246,13 +1246,6 @@ In 2018, we merged Caffe2 into the PyTorch source repository. While the
 steady state aspiration is that Caffe2 and PyTorch share code freely,
 in the meantime there will be some separation.
 
-If you submit a PR to only PyTorch or only Caffe2 code, CI will only
-run for the project you edited. The logic for this is implemented
-in `.jenkins/pytorch/dirty.sh` and `.jenkins/caffe2/dirty.sh`; you
-can look at this to see what path prefixes constitute changes.
-This also means if you ADD a new top-level path, or you start
-sharing code between projects, you need to modify these files.
-
 There are a few "unusual" directories which, for historical reasons,
 are Caffe2/PyTorch specific. Here they are:
 

binaries/CMakeLists.txt

@@ -1,13 +1,8 @@
 if(INTERN_BUILD_MOBILE)
-  if(BUILD_CAFFE2_MOBILE)
-    #caffe2_binary_target("predictor_verifier.cc")
-    caffe2_binary_target("speed_benchmark.cc")
-  else()
-    caffe2_binary_target("speed_benchmark_torch.cc")
-    caffe2_binary_target("load_benchmark_torch.cc")
-    if(NOT BUILD_LITE_INTERPRETER)
-      caffe2_binary_target("compare_models_torch.cc")
-    endif()
+  caffe2_binary_target("speed_benchmark_torch.cc")
+  caffe2_binary_target("load_benchmark_torch.cc")
+  if(NOT BUILD_LITE_INTERPRETER)
+    caffe2_binary_target("compare_models_torch.cc")
   endif()
   return()
 endif()