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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Example Ada calling Gnu Scientific Library (GSL)
Date: Wed, 05 Apr 2017 17:29:29 +0100
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Date: 2017-04-05T17:29:29+01:00
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hreba <f_hreba@yahoo.com.br> writes:

> Ok, I did this and now I am struggling with the project files. The
> first one handles the thin binding:
>
> library project GSL_Raw is
>    for Source_Dirs use ("src");
>    for Library_Dir use ".";
>    for Library_Name use "gsl_raw";
>    for Library_Kind use "static";
>    for Externally_Built use "true";
> end GSL_Raw;
>
> Directory src contains the output from g++ -c -fdump-ada-spec -C...
> There is another directory, obj, which holds the result from
> gcc -c -gnat05 ../src/*.ads.

Try

library project GSL_Raw is
   for Source_Dirs use ("src");
   for Library_Dir use "lib"; -- keeps .ali, libgsl_raw.a out of the way
   for Object_Dir use "obj";  -- for .ali, .o intermediate products
   for Library_Name use "gsl_raw";
   for Library_Kind use "static";
   for Externally_Built use "false"; -- you need to build it
end GSL_Raw;

and build with "gprbuild -p -P gsl_raw" - "-p" creates necessary
directories. Result is .ali, libgsl_raw.a in lib/. Don't use
"externally_built" at this early stage.

> Then there is the project of the thick binding in another directory:
>
> with "GSL_Raw/gsl_raw";
> library project GSL is
>    for Source_Dirs use ("src");
>    for Library_Name use "gsl";
>    for Library_Dir use ".";

again, I'd use "lib"