move USE_STATIC_DISPATCH from CI script to master cmake (#25696)

Summary:
Pull Request resolved: pytorch/pytorch#25696

Move the flag from CI to CMake so it's less magic and can be reused by
iOS build as well.

Test Plan: - will check CI

Differential Revision: D17202734

Pulled By: ljk53

fbshipit-source-id: da4f150cbcf2bb5624def386ce3699eff2a7446f

.circleci/config.yml

@@ -274,11 +274,6 @@ jobs:
             NAMED_FLAG="export BUILD_NAMEDTENSOR=1"
           fi
 
-          # dispatch aten ops statically for mobile
-          if [[ ${BUILD_ENVIRONMENT} == *"android"* ]]; then
-            NAMED_FLAG="export USE_STATIC_DISPATCH=1"
-          fi
-
           export COMMAND='((echo "export BUILD_ENVIRONMENT=${BUILD_ENVIRONMENT}" && echo '"$NAMED_FLAG"' && echo "source ./workspace/env" && echo "sudo chown -R jenkins workspace && cd workspace && .jenkins/pytorch/build.sh") | docker exec -u jenkins -i "$id" bash) 2>&1'
           echo ${COMMAND} > ./command.sh && unbuffer bash ./command.sh | ts
 
@@ -350,7 +345,6 @@ jobs:
             export COMMAND='((echo "export BUILD_ENVIRONMENT=${BUILD_ENVIRONMENT}" && echo '"$NAMED_FLAG"'&& echo "source ./workspace/env" && echo "sudo chown -R jenkins workspace && cd workspace && .jenkins/pytorch/test.sh") | docker exec -u jenkins -i "$id" bash) 2>&1'
           fi
           echo ${COMMAND} > ./command.sh && unbuffer bash ./command.sh | ts
-
   caffe2_linux_build:
     <<: *caffe2_params
     machine:

.circleci/verbatim-sources/pytorch-job-specs.yml

@@ -32,11 +32,6 @@ jobs:
             NAMED_FLAG="export BUILD_NAMEDTENSOR=1"
           fi
 
-          # dispatch aten ops statically for mobile
-          if [[ ${BUILD_ENVIRONMENT} == *"android"* ]]; then
-            NAMED_FLAG="export USE_STATIC_DISPATCH=1"
-          fi
-
           export COMMAND='((echo "export BUILD_ENVIRONMENT=${BUILD_ENVIRONMENT}" && echo '"$NAMED_FLAG"' && echo "source ./workspace/env" && echo "sudo chown -R jenkins workspace && cd workspace && .jenkins/pytorch/build.sh") | docker exec -u jenkins -i "$id" bash) 2>&1'
           echo ${COMMAND} > ./command.sh && unbuffer bash ./command.sh | ts
 
@@ -108,4 +103,3 @@ jobs:
             export COMMAND='((echo "export BUILD_ENVIRONMENT=${BUILD_ENVIRONMENT}" && echo '"$NAMED_FLAG"'&& echo "source ./workspace/env" && echo "sudo chown -R jenkins workspace && cd workspace && .jenkins/pytorch/test.sh") | docker exec -u jenkins -i "$id" bash) 2>&1'
           fi
           echo ${COMMAND} > ./command.sh && unbuffer bash ./command.sh | ts
-

CMakeLists.txt

@@ -310,6 +310,7 @@ if (INTERN_BUILD_MOBILE AND NOT BUILD_CAFFE2_MOBILE)
   set(FEATURE_TORCH_MOBILE ON)
   set(NO_API ON)
   set(USE_FBGEMM OFF)
+  set(USE_STATIC_DISPATCH ON)
 endif()
 
 # ---[ Utils