Index: bin/ebuild.sh
===================================================================
RCS file: /var/cvsroot/gentoo-src/portage/bin/ebuild.sh,v
retrieving revision 1.201.2.35
diff -u -r1.201.2.35 ebuild.sh
--- bin/ebuild.sh	31 May 2005 22:44:50 -0000	1.201.2.35
+++ bin/ebuild.sh	11 Jun 2005 21:06:46 -0000
@@ -130,7 +130,16 @@
 	
 	# Make sure we have this USE flag in IUSE
 	if ! hasq "${u}" ${IUSE} ${E_IUSE} && ! hasq "${u}" ${PORTAGE_ARCHLIST} selinux; then
-		echo "QA Notice: USE Flag '${u}' not in IUSE for ${CATEGORY}/${PF}" >&2
+		local prefix expanded=0
+		# USE_EXPANDed USE flags are not in IUSE
+		for prefix in ${USE_EXPAND_PREFIX}; do
+			if [ "${u:0:${#prefix}}" == "${prefix}" ]; then
+				expanded=1
+			fi
+		done
+		if [ ${expanded} -eq 0 ]; then
+			echo "QA Notice: USE Flag '${u}' not in IUSE for ${CATEGORY}/${PF}" >&2
+		fi
 	fi
 
 	for x in ${USE}; do
Index: pym/portage.py
===================================================================
RCS file: /var/cvsroot/gentoo-src/portage/pym/portage.py,v
retrieving revision 1.524.2.76
diff -u -r1.524.2.76 portage.py
--- pym/portage.py	29 May 2005 12:40:08 -0000	1.524.2.76
+++ pym/portage.py	11 Jun 2005 21:06:55 -0000
@@ -1051,6 +1051,11 @@
 				self.pusedict = {}
 				self.pkeywordsdict = {}
 				self.punmaskdict = {}
+				# Remove USE_EXPANDed settings from local settings
+				for use_expand in self["USE_EXPAND"].split():
+					for config in ["conf", "env", "backupenv"]:
+						if self.configdict[config].has_key(use_expand):
+							del self.configdict[config][use_expand]
 			else:
 				locations = [self["PORTDIR"] + "/profiles", USER_CONFIG_PATH]
 				for ov in self["PORTDIR_OVERLAY"].split():
@@ -1382,6 +1387,7 @@
 
 		#cache split-up USE var in a global
 		usesplit=[]
+		expandprefix=[]
 
 		for x in string.split(self.configlist[-1]["USE"]):
 			if x not in self.usemask:
@@ -1389,6 +1395,7 @@
 
 		if self.has_key("USE_EXPAND"):
 			for var in string.split(self["USE_EXPAND"]):
+				expandprefix.append(var.lower()+"_")
 				if self.has_key(var):
 					for x in string.split(self[var]):
 						mystr = string.lower(var)+"_"+x
@@ -1402,6 +1409,7 @@
 					usesplit.insert(0,self.configdict["defaults"]["ARCH"])
 
 		self.configlist[-1]["USE"]=string.join(usesplit," ")
+		self.configlist[-1]["USE_EXPAND_PREFIX"]=string.join(expandprefix," ")
 
 		self.already_in_regenerate = 0
 
@@ -3760,7 +3768,13 @@
 
 		while mysettings["ARCH"] in mymasks:
 			del mymasks[mymasks.index(mysettings["ARCH"])]
-		mysplit = portage_dep.use_reduce(mysplit,uselist=myusesplit,masklist=mymasks,matchall=(use=="all"),excludeall=[mysettings["ARCH"]])
+		myexcludes = [mysettings["ARCH"]]
+		use_expands = mysettings["USE_EXPAND"].split()
+		for use_expand in use_expands:
+			if mysettings.has_key(use_expand):
+				for value in mysettings[use_expand].split():
+					myexcludes.append(use_expand.lower() + "_" + value)
+		mysplit = portage_dep.use_reduce(mysplit,uselist=myusesplit,masklist=mymasks,matchall=(use=="all"),excludeall=myexcludes,use_expands=use_expands)
 	else:
 		mysplit = portage_dep.use_reduce(mysplit,uselist=myusesplit,matchall=(use=="all"))
 
Index: pym/portage_dep.py
===================================================================
RCS file: /var/cvsroot/gentoo-src/portage/pym/portage_dep.py,v
retrieving revision 1.15.2.3
diff -u -r1.15.2.3 portage_dep.py
--- pym/portage_dep.py	2 Apr 2005 14:07:59 -0000	1.15.2.3
+++ pym/portage_dep.py	11 Jun 2005 21:06:55 -0000
@@ -56,7 +56,7 @@
 			mylist = mylist + [subsec]
 	return mylist
 
-def use_reduce(deparray, uselist=[], masklist=[], matchall=0, excludeall=[]):
+def use_reduce(deparray, uselist=[], masklist=[], matchall=0, excludeall=[], use_expands=[]):
 	"""Takes a paren_reduce'd array and reduces the use? conditionals out
 	leaving an array with subarrays
 	"""
@@ -83,7 +83,7 @@
 		head = mydeparray.pop(0)
 
 		if type(head) == types.ListType:
-			rlist = rlist + [use_reduce(head, uselist, masklist, matchall, excludeall)]
+			rlist = rlist + [use_reduce(head, uselist, masklist, matchall, excludeall, use_expands)]
 
 		else:
 			if head[-1] == "?": # Use reduce next group on fail.
@@ -110,6 +110,12 @@
 				ismatch = True
 				for head in newdeparray[:-1]:
 					head = head[:-1]
+					for use_expand in use_expands:
+						if head.startswith(use_expand.lower() + "_") and head not in excludeall:
+							# We have a USE_EXPANDed flag that is not excluded
+							ismatch = False
+							break
+
 					if head[0] == "!":
 						head = head[1:]
 						if not matchall and head in uselist or head in excludeall:
@@ -126,7 +132,7 @@
 				if ismatch:
 					target = newdeparray[-1]
 					if isinstance(target, list):
-						rlist += [use_reduce(target, uselist, masklist, matchall, excludeall)]
+						rlist += [use_reduce(target, uselist, masklist, matchall, excludeall, use_expands)]
 					else:
 						rlist += [target]