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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Exporting linker options from library GPR
Date: Fri, 19 Jan 2018 14:25:27 +0000
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Date: 2018-01-19T14:25:27+00:00
List-Id: <comp.lang.ada>

I'm working with SDLAda, thanks Luke, on macOS, using a prebuilt SDL2,
which comes as a framework.

Whenever another project needs to link against the library project
concerned, it has to use the options

   ("-F", external ("HOME") & "/Library/Frameworks",
    "-framework", "SDL2")

I tried (in this project)

   Linking_Options := ("-F", external ("HOME") & "/Library/Frameworks",
                       "-framework", "SDL2");
   for Library_Options use Linking_Options;
   package Linker is
      for Default_Switches ("ada") use Linking_Options;
   end Linker;

(which results in the warning that Linker switches aren't taken account
in library Projects)

and in the using project

   package Linker renames SDLAda.Linker;

I could avoid the warning by omitting SDLAda.Linker and writing in the
using project

   package Linker is
      for Default_Switches ("ada") use SDLAda.Linking_Options;
   end Linker;

These workrounds are all very well, but is there any way of telling the
final linker to add these switches automatically?