Fix issue that the Debug mode doesn't work

Author: yuandong-tian

CMakeLists.txt

@@ -46,7 +46,7 @@ set(CMAKE_CXX_FLAGS
     "${CMAKE_CXX_FLAGS} -Wall -Werror -Wextra -Wno-register -Wno-deprecated-declarations -fPIC -march=native")
 set(CMAKE_CXX_FLAGS_RELEASE "-O3")
 if(NOT CMAKE_BUILD_TYPE)
-  set(CMAKE_BUILD_TYPE Release)
+    set(CMAKE_BUILD_TYPE Release)
 endif()
 
 # Define a convenience function for tests

third_party/CMakeLists.txt

@@ -3,6 +3,10 @@ cmake_minimum_required(VERSION 3.3)
 # These projects all have CMakeLists by default, thank you devs!
 
 add_subdirectory(googletest)
+
+set_target_properties(gtest
+    PROPERTIES
+    DEBUG_POSTFIX "")
 add_subdirectory(json)
 add_subdirectory(pybind11)
 add_subdirectory(spdlog)