Warn if python_foreach_impl is called directly from within a phase
function that is already covered by a distutils-r1 sub-phase.

Signed-off-by: Michał Górny <mgorny@gentoo.org>
---
eclass/distutils-r1.eclass | 1 +
eclass/python-r1.eclass | 18 ++++++++++++++++++
2 files changed, 19 insertions(+)

diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass
index 0e069597b3ab..0696b096b3c3 100644
--- a/eclass/distutils-r1.eclass
+++ b/eclass/distutils-r1.eclass
@@ -1750,6 +1750,7 @@ _distutils-r1_run_foreach_impl() {
set -- distutils-r1_run_phase "${@}"

if [[ ! ${DISTUTILS_SINGLE_IMPL} ]]; then
+ local _DISTUTILS_CALLING_FOREACH_IMPL=1
python_foreach_impl "${@}"
else
if [[ ! ${EPYTHON} ]]; then
diff --git a/eclass/python-r1.eclass b/eclass/python-r1.eclass
index 2f8cfa0316d9..3471e17bdde6 100644
--- a/eclass/python-r1.eclass
+++ b/eclass/python-r1.eclass
@@ -625,6 +625,24 @@ _python_multibuild_wrapper() {
python_foreach_impl() {
debug-print-function ${FUNCNAME} "${@}"

+ if [[ ${_DISTUTILS_R1} ]]; then
+ if has "${EBUILD_PHASE}" prepare configure compile test install &&
+ [[ ! ${_DISTUTILS_CALLING_FOREACH_IMPL} &&
+ ! $