2007-04-06  Vincent Celier  <celier@adacore.com>

	* prj-ext.adb (Initialize_Project_Path): New procedure that initialize
	the default project path, initially done during elaboration of the
	package.
	If the prefix returned by Sdefault is null, get the prefix from a call
	to Executable_Prefix_Path.
	(Project_Path): Call Initialize_Project_Path if Current_Project_Path is
	null.

	* prj-nmsc.adb (Get_Path_Names_And_Record_Sources): Use the non
	canonical directory name to open the directory from which files are
	retrieved.
	(Record_Other_Sources): Idem.
	(Locate_Directory): Add the possibility to create automatically missing
	directories when Setup_Projects is True.
	Call Locate_Directory so that the directory will be created when
	Setup_Projects is True, for object dir, library dir, library ALI dir,
	library source copy dir and exec dir.

	* prj-pp.adb (Max_Line_Length): Set to 255 for compatibility with older
	versions of GNAT.

From-SVN: r123589