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From: "Luke A. Guest" <laguest@archeia.com>
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Subject: Re: Ada on Apple's new procesors
Date: Wed, 24 Jun 2020 00:07:08 +0100
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On 23/06/2020 21:25, Optikos wrote:

> Wait, do the FSF GNAT repositories themselves now contain the mods for LLVM instead of obtaining GNAT-LLVM mods from https://github.com/AdaCore/gnat-llvm, which is pure-GPLv3 licensed.

There was no change required. GNAT has always had an interface to the
GCC compiler via a glue layer which fits the interface exposed by GNAT.
GNAT-LLVM just implements the same interface. Read the README in the
GNAT-LLVM repo, it tells you to download the FSF GNAT.

> https://github.com/AdaCore/gnat-llvm/blob/master/COPYING3
> 
> If mixing FSF GNAT with any 1 or more non-data/non-script (i.e., compiled; linked) source file(s) in https://github.com/AdaCore/gnat-llvm, then RLE evaporates because that 1 or more source file lacks the RLE; hence FSF GNAT-LLVM would become pure GPLv3.
> 

The compiler links to GNAT-LLVM, the runtime doesn't.

Pretty sure that the AdaCore people said it won't fall under GPL.