License for code which generates code

[edA-qa mort-ora-y]

I have a project which takes an input file and generates code from it --
a compile in the *loosest* sense of the word.

I would like that the main code be GPL, but I also want that anybody can
do whatever they want with the generated code (much as how free
compilers tend to work).

How do I go about doing this split licensing?

Some points:
-currently the generated code is source form, not object form perse
-the generated code requires some non-generated dependencies (I guess
those would need to fall under a less restrictive license as well)
-those source dependencies are actually used by the compiler as well
(written in same language as target, PHP for now)

Any help, or some ideas would be appreciated.

-- 
edA-qa mort-ora-y
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