THRIFT-5168 Useless generated code when .thrift file only has service type
Client: cpp
Patch: zeshuai007 <51382517@qq.com>

This closes #2095
diff --git a/tutorial/cpp/CMakeLists.txt b/tutorial/cpp/CMakeLists.txt
index c6d8fc3..b250a2c 100644
--- a/tutorial/cpp/CMakeLists.txt
+++ b/tutorial/cpp/CMakeLists.txt
@@ -30,7 +30,6 @@
 set(tutorialgencpp_SOURCES
     gen-cpp/Calculator.cpp
     gen-cpp/SharedService.cpp
-    gen-cpp/shared_constants.cpp
     gen-cpp/shared_types.cpp
     gen-cpp/tutorial_constants.cpp
     gen-cpp/tutorial_types.cpp
@@ -38,7 +37,7 @@
 add_library(tutorialgencpp STATIC ${tutorialgencpp_SOURCES})
 LINK_AGAINST_THRIFT_LIBRARY(tutorialgencpp thrift)
 
-add_custom_command(OUTPUT gen-cpp/Calculator.cpp gen-cpp/SharedService.cpp gen-cpp/shared_constants.cpp gen-cpp/shared_types.cpp gen-cpp/tutorial_constants.cpp gen-cpp/tutorial_types.cpp
+add_custom_command(OUTPUT gen-cpp/Calculator.cpp gen-cpp/SharedService.cpp gen-cpp/shared_types.cpp gen-cpp/tutorial_constants.cpp gen-cpp/tutorial_types.cpp
     COMMAND ${THRIFT_COMPILER} --gen cpp -r ${PROJECT_SOURCE_DIR}/tutorial/tutorial.thrift
 )