>  using in safety-related embedded systems. 

Open source has several advantages:

1)  with open source you evaluate/validate compiler internals
      which might me import if you take safety seriously

2) the tools cannot be discontinued, this has
     happened to me with commercial tools in the past,
     this is important down the road as after you
     deploy your system you gain experience and confidence
     in your code and compiler and all that is largely
     wasted if you need to change your tool chain

3) SDCC community/developers seem to be
   pretty responsive

br Kusti

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