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Date: Fri, 1 Nov 2019 15:04:05 -0700 (PDT)
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Subject: How to write gpr files from scratch , example 1,
 build only one package
From: Alain De Vos <devosalain71@gmail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:57431
Date: 2019-11-01T15:04:05-07:00
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https://docs.adacore.com/gprbuild-docs/html/gprbuild_ug/gnat_project_manager.html

I have a file buttonhandler.adb containing :
-- TEST : Connecting via the On_* procedures first method
with GTk...stuff...;
package body buttonhandler is
   procedure On_Button_Click (Button : access Gtk_Button_Record'Class) is
   begin
      Put_line ("Hallo");
   end On_Button_Click;
end buttonhandler;
--------------------------------------------
> Now I write  : my_buttonhandler.gpr contents (as there is no main entry),                                              
with "gtkada.gpr";
project My_buttonhandler is
end My_buttonhandler;
------------------------------------------
Executing :
gprbuild -Pmy_buttonhandler.gpr returns :
Compile
   [Ada]          buttonhandler.adb
buttonhandler.adb:19:14: file "buttonhandler.ads" not found