Fix submodule (PaddlePaddle#1384)

Author: tianshuo78520a

cmake/paddle.cmake

@@ -71,6 +71,10 @@ endif()
 # submodule Paddle first
 set(paddle_submodule $ENV{paddle_submodule})
 if(paddle_submodule)
+  get_filename_component(REPO_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../../"
+                         ABSOLUTE)
+  get_filename_component(PADDLE_SOURCE_DIR "${REPO_SOURCE_DIR}/Paddle" ABSOLUTE)
+  message(STATUS "PADDLE_SOURCE_DIR=${PADDLE_SOURCE_DIR}")
   message(
     "Paddle submodule already exists, skip git submodule update --init Paddle")
 else()

cmake/third_party.cmake

@@ -41,28 +41,34 @@ macro(check_update_submodule MODULE_NAME)
 endmacro()
 
 # ########################## include third_party ###############################
-
-check_update_submodule(gflags)
+if(NOT paddle_submodule)
+  check_update_submodule(gflags)
+  check_update_submodule(glog)
+endif()
 include(external/gflags) # gflags
-
-check_update_submodule(glog)
 include(external/glog) # glog
 
 list(APPEND third_party_deps extern_gflags extern_glog)
 if(NOT ON_INFER)
-  check_update_submodule(pybind)
+  if(NOT paddle_submodule)
+    check_update_submodule(pybind)
+  endif()
   include(external/pybind11) # pybind
   list(APPEND third_party_deps extern_pybind)
 endif()
 
 if(WITH_TESTING)
-  check_update_submodule(gtest)
+  if(NOT paddle_submodule)
+    check_update_submodule(gtest)
+  endif()
   include(external/gtest) # gtest
   list(APPEND third_party_deps extern_gtest)
 endif()
 
 if(WITH_MKL AND NOT WITH_ARM)
-  check_update_submodule(onednn)
+  if(NOT paddle_submodule)
+    check_update_submodule(onednn)
+  endif()
   include(external/onednn) # onednn
   list(APPEND third_party_deps extern_onednn)
 endif()