From ad8b14f7df1314507ebcdc5e3b1c5174ae8ed6fd Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Tue, 10 Jul 2007 23:17:23 +0000
Subject: [PATCH] For bug #184843, allow USE_EXPAND variables to pass through
 if none of their flags are in IUSE. This allows packages that support LINGUAS
 but don't declare it in IUSE to use the variable outside of the USE_EXPAND
 context. (trunk r7218)

svn path=/main/branches/2.1.2/; revision=7219
---
 pym/portage.py | 59 +++++++++++++++++++++++++++++++-------------------
 1 file changed, 37 insertions(+), 22 deletions(-)

diff --git a/pym/portage.py b/pym/portage.py
index 7127a1c7f..158484195 100644
--- a/pym/portage.py
+++ b/pym/portage.py
@@ -2029,34 +2029,49 @@ class config:
 			# like LINGUAS.
 			var_split = [ x for x in var_split if x in expand_flags ]
 			var_split.extend(expand_flags.difference(var_split))
-			if (var_split or var in self) and \
-				"*" not in var_split:
+			has_wildcard = "*" in var_split
+			if has_wildcard:
+				var_split = [ x for x in var_split if x != "*" ]
+			has_iuse = False
+			for x in iuse:
+				if x.startswith(prefix):
+					has_iuse = True
+					break
+			if has_wildcard:
+				# * means to enable everything in IUSE that's not masked
+				if has_iuse:
+					for x in iuse:
+						if x.startswith(prefix) and x not in self.usemask:
+							suffix = x[prefix_len:]
+							if suffix in var_split:
+								continue
+							var_split.append(suffix)
+							usesplit.append(x)
+				else:
+					# If there is a wildcard and no matching flags in IUSE then
+					# LINGUAS should be unset so that all .mo files are
+					# installed.
+					var_split = []
+			if var_split:
+				self[var] = " ".join(var_split)
+			else:
 				# Don't export empty USE_EXPAND vars unless the user config
 				# exports them as empty.  This is required for vars such as
 				# LINGUAS, where unset and empty have different meanings.
-				self[var] = " ".join(var_split)
-			elif "*" in var_split:
-				# * means to enable everything in IUSE that's not masked
-				filtered_split = []
-				for x in var_split:
-					if x == "*":
-						continue
-					if (prefix + x) in iuse:
-						filtered_split.append(x)
-				var_split = filtered_split
-				for x in iuse:
-					if x.startswith(prefix) and x not in self.usemask:
-						suffix = x[prefix_len:]
-						if suffix in var_split:
-							continue
-						var_split.append(suffix)
-						usesplit.append(x)
-				if var_split:
-					self[var] = " ".join(var_split)
-				elif var in self:
+				if has_wildcard:
 					# ebuild.sh will see this and unset the variable so
 					# that things like LINGUAS work properly
 					self[var] = "*"
+				else:
+					if has_iuse:
+						self[var] = ""
+					else:
+						# It's not in IUSE, so just allow the variable content
+						# to pass through if it is defined somewhere.  This
+						# allows packages that support LINGUAS but don't
+						# declare it in IUSE to use the variable outside of the
+						# USE_EXPAND context.
+						pass
 
 		# Pre-Pend ARCH variable to USE settings so '-*' in env doesn't kill arch.
 		if self.configdict["defaults"].has_key("ARCH"):
-- 
2.26.2