make.adb (Gnatmake_Switch_Found): New Boolean global variable

2008-08-20  Vincent Celier  <celier@adacore.com>

	* make.adb (Gnatmake_Switch_Found): New Boolean global variable
	(Switch_May_Be_Passed_To_The_Compiler): New Boolean global variable
	(Add_Switches): New Boolean parameter Unknown_Switches_To_The_Compiler
	 defaulted to True. Fail when Unknown_Switches_To_The_Compiler is False
	and a switch is not recognized by gnatmake.
	(Gnatmake): Implement new scheme for gnatmake switches and global
	compilation switches.
	(Switches_Of): Try successively Switches (<file name>),
	Switches ("Ada"), Switches (others) and Default_Switches ("Ada").

From-SVN: r139315