Leverage the REQUIRED_USE mechanism to determine at dependency resolution time if...

diff --git a/eclass/ruby-ng.eclass b/eclass/ruby-ng.eclass
index 0d32217c118ed2f0316da797c3458ede2655f8bb..a63a285fd90741d153c027be31f4f350ded6fd68 100644 (file)
--- a/eclass/ruby-ng.eclass
+++ b/eclass/ruby-ng.eclass
@@ -1,6 +1,6 @@
 # Copyright 1999-2009 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
-# $Header: /var/cvsroot/gentoo-x86/eclass/ruby-ng.eclass,v 1.35 2011/07/19 05:48:09 graaff Exp $
+# $Header: /var/cvsroot/gentoo-x86/eclass/ruby-ng.eclass,v 1.36 2011/07/22 09:08:59 graaff Exp $
 #
 # @ECLASS: ruby-ng.eclass
 # @MAINTAINER:
@@ -257,6 +257,21 @@ ruby_add_bdepend() {
        RDEPEND="${RDEPEND}"
 }
 
+# @FUNCTION: ruby_get_use_targets
+# @DESCRIPTION:
+# Gets an array of ruby use targets that the ebuild sets
+ruby_get_use_targets() {
+       local t implementation
+       for implementation in ${USE_RUBY}; do
+               t+=" ruby_targets_${implementation}"
+       done
+       echo $t
+}
+
+if [[ ${EAPI:-0} -ge 4 && ${RUBY_OPTIONAL} != "yes" ]]; then
+       REQUIRED_USE=" || ( $(ruby_get_use_targets) )"
+fi
+
 for _ruby_implementation in $USE_RUBY; do
        IUSE="${IUSE} ruby_targets_${_ruby_implementation}"