[Ada] Package extensions in project files

[Arnaud Charlet <charlet at adacore dot com>]

It is now allowed to extend a package with the same name from an imported
or extended project. The test for this is to invoke gnatmake on project
prj.gpr:

project Empty is
   for Source_Files use ();

   package Compiler is
      for Switches ("Ada") use ("-O2");
   end Compiler;
end Empty;

with "empty.gpr";
project Prj is
   for Main use ("main.adb");

   package Compiler extends Empty.Compiler is
      for Switches ("Ada") use Compiler'Switches ("Ada") & ("-g");
   end Compiler;
end Prj;

Sources of project Prj should be compiled with -O2 -g.

Tested on x86_64-pc-linux-gnu, committed on trunk

2010-09-10  Vincent Celier  <celier@adacore.com>

	* prj-dect.adb (Parse_Package_Declaration): Allow a package to extend
	a package with the same name from an imported or extended project.
	* prj-proc.adb (Process_Declarative_Items): Process package extensions

Attachment: difs
Description: Text document