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Newsgroups: comp.lang.ada
Date: Mon, 14 Nov 2016 00:28:08 -0800 (PST)
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Subject: Re: Problems passing compiler parameters in GPR files
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Xref: news.eternal-september.org comp.lang.ada:32308
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> I've no real clue why not having only those in the builder don't work. Can anyone explain?

That's too many negatives in the same sentence, but your project is only declaring a variable, it isn't modifying any of the project attributes that the tools read. Also these are compiler switches, not builder switches.

    package Compiler is
        for Switches ("Ada") use ("-gnata", ....);
    end Compiler;