From 4d30fd5e6a7548b9aab7977a27a575fe0dff4b13 Mon Sep 17 00:00:00 2001
From: "Dirk O. Kaar" <dok@dok-net.net>
Date: Sat, 16 Nov 2019 12:22:41 +0100
Subject: [PATCH] Weak binding lessens version dependency between ESP8266 and
 MT library CoopTask.

---
 cores/esp8266/core_esp8266_main.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cores/esp8266/core_esp8266_main.cpp b/cores/esp8266/core_esp8266_main.cpp
index 805dca43dc..4818852fcc 100644
--- a/cores/esp8266/core_esp8266_main.cpp
+++ b/cores/esp8266/core_esp8266_main.cpp
@@ -100,12 +100,14 @@ static void esp_yield_within_cont() {
         run_scheduled_recurrent_functions();
 }
 
-extern "C" void esp_yield() {
+extern "C" void __esp_yield() {
     if (can_yield()) {
         esp_yield_within_cont();
     }
 }
 
+extern "C" void esp_yield() __attribute__ ((weak, alias("__esp_yield")));
+
 extern "C" void esp_schedule() {
     // always on CONT stack here
     ets_post(LOOP_TASK_PRIORITY, 0, 0);