Using of parse tree externally

[Joe Buck]

> I'm sure the GCC license could be modified in such a way to say, in
> effect, "In addition to re-use of GCC source code, any code which
> utilizes, in any way, any intermediate output of the compiler, such as
> the parse tree or RTL, or any code which links against sections of GCC,
> shall fall under the GPL".

No.  Copyright law doesn't let you do that.  We can't just write our own
law.  People have the right to write a program that reads a file format,
as long as they don't use anyone else's code to do it.