From 1d8c3f4cff19e8128757a7c24ca98d6ea5e95c0d Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Wed, 26 Apr 2017 11:34:22 +1000
Subject: [PATCH] mpy-cross/Makefile: Override undefine any inherited
 variables.

This is a temporary hack to allow othe Makefiles to build mpy-cross
recursively.
---
 mpy-cross/Makefile | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/mpy-cross/Makefile b/mpy-cross/Makefile
index 6ed4e653f8..de07d2f6d4 100644
--- a/mpy-cross/Makefile
+++ b/mpy-cross/Makefile
@@ -1,3 +1,14 @@
+# The following is a temporary hack to forefully undefine vars that might have
+# be defined by a calling Makefile (from recursive make).
+# TODO: Find a better way to be able to call this Makefile recursively.
+override undefine COPT
+override undefine CFLAGS_EXTRA
+override undefine LDFLAGS_EXTRA
+override undefine FROZEN_DIR
+override undefine FROZEN_MPY_DIR
+override undefine BUILD
+override undefine PROG
+
 include ../py/mkenv.mk
 
 # define main target