2011-08-04  Emmanuel Briot  <briot@adacore.com>

	* prj.adb, prj.ads, makeutl.adb, makeutl.ads (Complete_Mains,
	Compute_Compilation_Phases): new subprogram.
	(Builder_Data, Builder_Project_Tree_Data): new subprogram and type
	The number of mains as well as the various compilation phases that
	need to be run are now project tree specific, since various
	aggregated trees might have different requirements. In particular,
	they do not all require bind or link phases.

From-SVN: r177317