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Using a GPL-licensed compiler doesn't mean you have to release the source code that you compile with it.

(I am not a lawyer; do not rely on my advice without thoroughly verifying it.)

Perhaps it has to do with the runtime being GPL'd? Regardless, the Adacore FAQ specifically councels that the GPL version is suitable for free software only.[0] Admittedly, I find the licensing situation confusing and could be completely in the wrong here.

[0] http://libre.adacore.com/tools/gnat-gpl-edition/faq/

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