makegpr.adb (Add_Archive_Path): Use untouched object and library dirs and library name.

2007-04-20  Pascal Obry  <obry@adacore.com>
	    Vincent Celier  <celier@adacore.com>

	* makegpr.adb (Add_Archive_Path): Use untouched object and library
	dirs and library name.
	(Build_Global_Archive): Idem. Minor code clean-up. Removes duplicate
	comments.
	(Build_Library): Idem.
	(Compile_Individual_Sources): Idem.
	(Compile_Link_With_Gnatmake): Idem.
	(Compile_Sources): Idem.
	(Get_Imported_Directories): Idem.
	(Link_Executables): Idem. Same change for the executable dir.
	(Check_Compilation_Needed): C_Source_Path new variable containing
	the canonical form of Source_Path to check against the source names
	in the dependency file.
	(Build_Global_Archive, Compile_Individual_Sources, Compile_Sources): In
	verbose mode, display the name of the object directory we're changing
	to.
	(Saved_Switches): New name of table X_Switches
	(Scan_Arg): Recognize new switch -aP and save in table Saved_Switches
	(Usage): New line for switch -aP
	(Get_Imported_Directories.Add): Make sure that Add_Arg is True before
	testing if a directory should be added to the search path.

From-SVN: r125476