opt.ads, opt.adb: Add new switches Debug_Pragmas_Enabled[_Config]

opt.ads, opt.adb: Add new switches Debug_Pragmas_Enabled[_Config]

2005-09-01  Robert Dewar  <dewar@adacore.com>

	* opt.ads, opt.adb: Add new switches Debug_Pragmas_Enabled[_Config]

	* par-prag.adb: Implement new pragma Debug_Policy

	* sem_prag.adb Implement new pragma Debug_Policy
	(Analyze_Pragma, case Pack): do not let pragma Pack override an explicit
	Component_Size attribute specification. Give warning for ignored pragma
	Pack.

	* snames.h, snames.ads, snames.adb: Introduce entries in
	Preset_Names for Name_Disp_Asynchronous_Select,
	Name_Disp_Conditional_Select, Name_Disp_Get_Prim_Op_Kind,
	Name_Disp_Timed_Select.
	New pragma Debug_Policy

	* switch-c.adb (Scan_Front_End_Switches): Set Ada 2005 mode
	explicitly.
	Switch -gnata also sets Debug_Pragmas_Enabled

	* sem.adb, par.adb (Set_Opt_Config_Switch): Add parameter Main_Unit to
	handle an explicit -gnata when compiling predefined files.

From-SVN: r103873