[gentoo-python] [PATCH] Don't warn about USE_PYTHON when the package does not support typical python versions

[Mike Gilbert <floppym@gentoo.org>]

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Attached is a quick and dirty patch to prevent the typical user from
being advised to set USE_PYTHON for packages which support both python2
and/or python3, but not 2.7 or 3.2.

If someone can come up with a better fix, by all means send it my way.

For example, see the message produced by dev-python/simplejson-3.0.4-r1.

 * It seems that you need to set USE_PYTHON to make sure that legacy
 * packages will be built with respect to PYTHON_TARGETS correctly:
 *
 *      USE_PYTHON='2.7'
 *
 * Please note that after changing the USE_PYTHON variable, you may need
 * to run 'python-updater' to rebuild affected packages.
 *
 * For more information on python.eclass compatibility, please see
 * the appropriate python-r1 User's Guide chapter [1].
 *
 * [1]
http://www.gentoo.org/proj/en/Python/python-r1/user-guide.xml#doc_chap2

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Index: python-r1.eclass
===================================================================
RCS file: /var/cvsroot/gentoo-x86/eclass/python-r1.eclass,v
retrieving revision 1.34
diff -u -B -r1.34 python-r1.eclass
--- python-r1.eclass	2 Jan 2013 21:12:44 -0000	1.34
+++ python-r1.eclass	3 Jan 2013 22:58:55 -0000
@@ -382,6 +382,10 @@
 			# is installed.
 			if [[ ! ${py2+1} && ${dis_py2} ]]; then
 				debug-print "${FUNCNAME}: -> all py2 versions disabled"
+				if ! has python2_7 "${PYTHON_COMPAT[@]}"; then
+					debug-print "${FUNCNAME}: ---> package does not support 2.7"
+					return 0
+				fi
 				if has_version '=dev-lang/python-2*'; then
 					debug-print "${FUNCNAME}: ---> but =python-2* installed!"
 					return 1
@@ -389,6 +393,10 @@
 			fi
 			if [[ ! ${py3+1} && ${dis_py3} ]]; then
 				debug-print "${FUNCNAME}: -> all py3 versions disabled"
+				if ! has python3_2 "${PYTHON_COMPAT[@]}"; then
+					debug-print "${FUNCNAME}: ---> package does not support 3.2"
+					return 0
+				fi
 				if has_version '=dev-lang/python-3*'; then
 					debug-print "${FUNCNAME}: ---> but =python-3* installed!"
 					return 1

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