Make ApproximatelyEquals fit for protobuf2

CMakeLists.txt

@@ -12,6 +12,17 @@ include(package)
 find_package(SWIG 2.0)
 find_package(CUDA QUIET)
 find_package(Protobuf REQUIRED)
+
+# Check protobuf library version.
+execute_process(COMMAND ${PROTOBUF_PROTOC_EXECUTABLE} --version
+	OUTPUT_VARIABLE PROTOBUF_VERSION)
+string(REPLACE "libprotoc " "" PROTOBUF_VERSION ${PROTOBUF_VERSION})
+
+set(PROTOBUF_3 OFF)
+if (${PROTOBUF_VERSION} VERSION_GREATER "3.0.0" OR ${PROTOBUF_VERSION} VERSION_EQUAL "3.0.0")
+    set(PROTOBUF_3 ON)
+endif()
+
 find_package(PythonLibs 2.7 REQUIRED)
 find_package(PythonInterp 2.7 REQUIRED)
 find_package(ZLIB REQUIRED)

proto/CMakeLists.txt

@@ -1,12 +1,3 @@
-execute_process(COMMAND ${PROTOBUF_PROTOC_EXECUTABLE} --version
-	OUTPUT_VARIABLE PROTOBUF_VERSION)
-string(REPLACE "libprotoc " "" PROTOBUF_VERSION ${PROTOBUF_VERSION})
-
-set(PROTOBUF_3 OFF)
-if (${PROTOBUF_VERSION} VERSION_GREATER "3.0.0" OR ${PROTOBUF_VERSION} VERSION_EQUAL "3.0.0")
-    set(PROTOBUF_3 ON)
-endif()
-
 set(proto_filenames
     DataConfig.proto
     DataFormat.proto

python/paddle/trainer_config_helpers/tests/CMakeLists.txt

@@ -4,11 +4,17 @@ add_test(NAME layers_test
         python ${PROJ_ROOT}/python/paddle/trainer_config_helpers/tests/layers_test.py
     WORKING_DIRECTORY ${PROJ_ROOT}/python/paddle)
 
+if (PROTOBUF_3)
   add_paddle_exe(protobuf_equal
     ProtobufEqualMain.cpp)
-
   add_test(NAME test_layerHelpers
     COMMAND
     ${PROJ_ROOT}/python/paddle/trainer_config_helpers/tests/configs/run_tests.sh
     ${CMAKE_CURRENT_BINARY_DIR}/protobuf_equal
   )
+else()
+  add_test(NAME test_layerHelpers
+    COMMAND
+    ${PROJ_ROOT}/python/paddle/trainer_config_helpers/tests/configs/run_tests.sh
+  )
+endif()