2011-08-03 Emmanuel Briot <briot@adacore.com>

2011-08-03  Emmanuel Briot  <briot@adacore.com>

	* gnatcmd.adb, prj-proc.adb, prj-proc.ads, make.adb, mlib-prj.adb,
	prj.adb, prj.ads, makeutl.adb, makeutl.ads, clean.adb, prj-nmsc.adb,
	prj-util.adb, prj-util.ads, prj-conf.adb, prj-conf.ads, prj-env.adb,
	prj-env.ads (Shared_Project_Tree_Data): new type
	An aggregate project and its aggregated trees need to share the common
	data structures used for lists of strings, packages,... This makes the
	code simpler since otherwise we have to pass the root tree (also used
	for the configuration file data) in addition to the current project
	tree. This also avoids ambiguities as to which tree should be used.
	And finally this saves a bit of memory.
	(For_Every_Project_Imported): new parameter Tree.
	Since aggregated projects are using a different tree, we need to let
	the caller know which tree to use to manipulate the returned project.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@177261 138bc75d-0d04-0410-961f-82ee72b054a4