when "Release" =>
         Prefix := "";
      when "Coverage" =>
         Prefix := "coverage/";
   end case;

   --  Source_Dirs is left to default "."
   for Source_Dirs use ("src");
   for Source_Dirs use ("src", "generated");
   for Object_Dir use Prefix & "obj";
   for Exec_Dir use Prefix & "bin";

   case Mode is
      when "Release" =>
         Extra_Switches := ("-O3");
      when "Coverage" =>