importing code in IR (GIMPLE and/or RTL)

[Robert Dewar]

I see. That's not a technical issue but some sort of a legal one.
In that case probably a new clause in the gcc license could be added
stating explicitely that any software doing so (feeding IR into the
compiler at some point) will be considered "derived work" for the
purpose of the GPL, and this should eliminate the possibility for
unfree front end, right?
No, this is not so simple, the license can only control copying.
And furthermore it is not productive to discuss this issue on this list.
If you do want to discuss it further,
Please first dig for old discussions
of this issue and move the discussion elsewhere.