[gentoo-python] [PATCH distutils-r1] Provide Python env in python_prepare_all().

["Michał Górny" <mgorny@gentoo.org>]

Some of the ebuilds need that, and call 'python_export_best' explicitly
for that reason. It is better to handle it eclass-wide, and therefore
gain consistency with other _all() phases.
---
 eclass/distutils-r1.eclass | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
index 2b609b4..b3ffd13 100644
--- a/eclass/distutils-r1.eclass
+++ b/eclass/distutils-r1.eclass
@@ -655,12 +655,21 @@ distutils-r1_src_prepare() {
 
 	local _DISTUTILS_DEFAULT_CALLED
 
-	# common preparations
-	if declare -f python_prepare_all >/dev/null; then
-		python_prepare_all
-	else
-		distutils-r1_python_prepare_all
-	fi
+	_distutils-r1_run_prepare_all() {
+		# we need to keep those local to ensure that the best-impl
+		# setting doesn't leak through to per-impl phases
+		local -x EPYTHON PYTHON
+		local -x PATH=${PATH} PKG_CONFIG_PATH=${PKG_CONFIG_PATH}
+		python_setup
+
+		# common preparations
+		if declare -f python_prepare_all >/dev/null; then
+			python_prepare_all
+		else
+			distutils-r1_python_prepare_all
+		fi
+	}
+	_distutils-r1_run_prepare_all
 
 	if [[ ! ${_DISTUTILS_DEFAULT_CALLED} ]]; then
 		eqawarn "QA warning: python_prepare_all() didn't call distutils-r1_python_prepare_all"
-- 
1.8.4