Generate compile_commands.json while building

CMakeLists.txt

@@ -21,6 +21,7 @@ endif()
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 if(USE_SANITIZERS)
   if(NOT COMMAND add_sanitizers)