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From: "Alex R. Mosteo" <devnull@mailinator.com>
Newsgroups: comp.lang.ada
Subject: Re: [GNAT 2006] Project file and conditional withing/linking
Date: Fri, 09 Jun 2006 10:08:20 +0200
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Date: 2006-06-09T10:08:20+02:00
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Alex R. Mosteo wrote:

> Simon Wright wrote:

>> We have defined environment-dependent symbols in non-source Projects
>> and then used the symbols to create the appropriate switches in the
>> user project. Something like
>> 
>>    package Linker is
>>      case Use_Other_Package is
>>        when Yes =>
>>          for Default_Switches ("ada")
>>            use ("-foo") & Other_Package.Linker_Switches;
>>        when No =>
>>          for Default_Switches ("ada") use ("-bar");
>>      end case;
>>    end Linker;
> 
> I used to do this with the GAP 2005 release, but it seems the GAP/GPL 2006
> release will pass the linker options to gnatlink no matter what, once you
> with the project. Maybe this is the difference between Default_Switches
> and Linker_Options. Going to set up a test case.

For the record, I've just tested it: Using Default_Switches will not
propagate through projects unless you do the appending as in your example,
whereas using Linker_Options will pass these arguments to the linker just
by withing the project.