Hi,

I'm new to gem5 and just start learning by following the tutorial on gem5.org. However, there's a problem when I try to create my custom object[1].

[1]: https://www.gem5.org/documentation/learning_gem5/part2/helloobject/

I follow exactly the guide, but I fail to re-compile with scons. The error message as below.

Error: SimObject(HelloObject.py...) must list c++ sim_objects or
enums > (set either to [] if there are none).

My gem5 version is Version 21.2.1.0, and I noticed that there's an *API change* about SimObject declaration in Version 21.2.0.0, requiring that sim_object parameter of SimObject declaration "should list all SimObject classes which have a type attribute defined".

It matches the error message. So I wonder how could I change my SConscript to fit this change? My current SConscript is from the tutorial.

```
Import("*")

SimObject("HelloObject.py")
Source("hello_object.py")
```

Artyom
artyom...@hust.edu.cn
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