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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Creating a GPR file to use a custom built runtime library
Date: Mon, 13 Jun 2016 20:56:35 +0100
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Date: 2016-06-13T20:56:35+01:00
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Jeremiah <jeremiah.breeden@gmail.com> writes:

>    package Builder is
>       for Default_Switches ("ada") use ("--RTS=../zfp-atsaml21j18");
>    End Builder;

I'm fairly sure that your version of gprbuild needs to see an absolute
directory here. You can get this by saying

   package Builder is
      for Default_Switches ("ada") use
        ("--RTS=" & project'Project_Dir & "../zfp-atsaml21j18");
   end Builder;

or you could say

   for Runtime ("ada") use project'Project_Dir & "../zfp-atsaml21j18";