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Date: Tue, 21 May 2013 20:47:28 +0200
From: Per Sandberg <per.sandberg@sandat.dyndns.org>
Newsgroups: comp.lang.ada
Subject: Re: Is it possible invoke $(pkg-config ...) in gnat project file?
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Date: 2013-05-21T20:47:28+02:00
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On Sat, 18 May 2013 19:10:55 +0200
Georg Bauhaus <rm.dash-bauhaus@futureapps.de> wrote:

> On 18.05.13 12:30, kylix wrote:
> > I tried add link switch "$(pkg-config --libs cairo) in Linker
> > section, it seems not work, any idea?
> >
> > project P is
> >       for Main use ("program");
> >       package Linker is
> >              for Default_Switches("Ada") use ("$(pkg-config --libs
> > cairo)"); end Linker;
> > end P;
> >
> 
> $(pkg-config ...) is shell syntax for command substitution, i.e.
> starting a new process. I think that GNAT project relates programs
> will only pass text, not interpret it, or have the shell interpret
> it.
> 
> You could have an external variable referenced in the project file and
> initialize it "outside", thus
> 
>    package Linker is
>      for Default_Switches("Ada") use ("-gnatwa") & external("MYGTKL");
>    end Linker;
> 
> $ MYGTKL=$(pkg-config --libs cairo) gnatmake -PP
> 
Not exact but almost the following works with GNAT 7.1:
package Linker is
 for Default_Switches("Ada") use ("-gnatwa") & external_as_list("MYGTKL"," ");
end Linker;

$gnatmake -PP "-XMYGTKL=$(pkg-config --libs cairo)"

/Per