build faiss thrift optional

Former-commit-id: 26ae31415424b7c86f8c7f99d0e30cc73c32f3f6

.gitignore

@@ -11,3 +11,4 @@ cmake_build
 *.tar.gz
 
 cpp/third_party/thrift-0.12.0/
+cpp/third_party/faiss-1.5.1

cpp/README.md

@@ -5,9 +5,12 @@
     ubuntu16.04 : sudo apt-install install gfortran libsqlite3-dev
 
 #### Step 2: build third-parties
+Note: If you want to debug into third-parties, you can build debug with CXXFLAGS='-g -O0' with option 
+: -t Debug
 
     cd [sourcecode path]/cpp/thid_party
-    ./build.sh
+    ./build.sh -t Debug
+    ./build.sh -t Release
     
 #### Step 3: build(output to cmake_build folder)
 cmake_build/src/vecwise_engine_server is the server
@@ -34,8 +37,8 @@ Then luanch server with config:
     vecwise_engine_server -c [sourcecode path]/cpp/conf/server_config.yaml
 
 ### Luanch test_client(only for debug)
-
-Client use same config file with server:
+If you want to test remote api, you can build test_client.
+test_client use same config file with server:
     
     cd [build output path]/test_client
     test_client -c [sourcecode path]/cpp/conf/server_config.yaml