From 1879db7105e5139160d79193fc95964662792401 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Peter=20Z=C3=BCger?= <zueger.peter@icloud.com>
Date: Fri, 3 Nov 2023 11:17:42 +0100
Subject: [PATCH] extmod/extmod.mk: Allow enabling lwip loopback support.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Enabling MICROPY_PY_LWIP_LOOPBACK via make will turn on loopback support.

Signed-off-by: Peter Züger <zueger.peter@icloud.com>
---
 extmod/extmod.mk | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/extmod/extmod.mk b/extmod/extmod.mk
index a04856bce2..84573ec861 100644
--- a/extmod/extmod.mk
+++ b/extmod/extmod.mk
@@ -267,6 +267,9 @@ SRC_THIRDPARTY_C += $(addprefix $(LWIP_DIR)/,\
 	core/ipv6/nd6.c \
 	netif/ethernet.c \
 	)
+ifeq ($(MICROPY_PY_LWIP_LOOPBACK),1)
+CFLAGS_EXTMOD += -DLWIP_NETIF_LOOPBACK=1
+endif
 ifeq ($(MICROPY_PY_LWIP_SLIP),1)
 CFLAGS_EXTMOD += -DMICROPY_PY_LWIP_SLIP=1
 SRC_THIRDPARTY_C += $(LWIP_DIR)/netif/slipif.c