2009-04-24  Vincent Celier  <celier@adacore.com>

	* gnatcmd.adb: Call Prj.Env.Initialize with the Project_Tree

	* prj-env.adb: Move all global variables to the private part of the
	project tree data.
	Access these new components instead of the global variables no longer
	in existence.
	(Add_To_Path): New Project_Tree_Ref parameter, to access the new
	components that were previously global variables.

	* prj-env.ads (Initialize): New Project_Tree_Ref parameter
	(Set_Mapping_File_Initial_State_To_Empty): New Project_Tree_Ref
	parameter.

	* prj-nmsc.adb (Compute_Unit_Name): New Project_Tree_Ref parameter to
	be able to call Set_Mapping_File_Initial_State_To_Empty with it.

	* prj.adb (Initialize): Do not call Prj.Env.Initialize
	(Reset): Do not call Prj.Env.Initialize. Instead, initialize the new
	components in the private part of the project tree data.

	* prj.ads (Private_Project_Tree_Data): new components moved from
	Prj.Env: Current_Source_Path_File, Current_Object_Path_File,
	Ada_Path_Buffer, Ada_Path_Length, Ada_Prj_Include_File_Set,
	Ada_Prj_Objects_File_Set, Fill_Mapping_File.

From-SVN: r146696