在 2019/12/29 13:11, Yubin Ruan 写道:
> Is there any gcc flag to warn about this?
> 
> 
> The return value of func() was truncated because the return type is
> accidentally written as int16_t
> 


It's `-Wconversion`. By the way I suggest you add `-Wsign-conversion` in
C++ as well.


-- 
Best regards,
LH_Mouse