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Nothing per se. I was confused in that both Adacore and FSF offer a compiler with the same name but different licensing.

As to my specific situation, I cannot release source code and so the Adacore GPL licensed product is a no-go.

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/