2010-10-04  Vincent Celier  <celier@adacore.com>

	* frontend.adb: Set Lib.Parsing_Main_Extended_Source to True before
	loading the main source, so that if it is preprocessed and -gnateG is
	used, the preprocessed file is written.
	* lib.ads (Analysing_Subunit_Of_Main): New global variable to indicate
	if a subunit is from the main unit when it is loaded.
	* sem_ch10.adb (Analyze_Proper_Body): Set Lib.Analysing_Subunit_Of_Main
	to True before loading a subunit.
	* sem_ch12.adb (Copy_Generic_Node): Set Lib.Analysing_Subunit_Of_Main
	to True when the main is a generic unit before loading one of its
	subunits.
	* sinput-l.adb (Load_File): If -gnateG is used, write the preprocessed
	file only for the main unit (spec, body and subunits).

From-SVN: r164934