From cfbbd6f22db6b9d76808424ea1a813b02ba9c5ab Mon Sep 17 00:00:00 2001
From: "Dirk O. Kaar" <19971886+dok-net@users.noreply.github.com>
Date: Sun, 18 Apr 2021 22:17:14 +0200
Subject: [PATCH] enableWiFiAtBootTime() should be declared in ESP8266WiFi.h
 (#7993)

---
 cores/esp8266/core_esp8266_features.h   | 2 --
 doc/esp8266wifi/generic-class.rst       | 2 +-
 libraries/ESP8266WiFi/src/ESP8266WiFi.h | 1 +
 3 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/cores/esp8266/core_esp8266_features.h b/cores/esp8266/core_esp8266_features.h
index 3eba0ac7d..c90abb9e5 100644
--- a/cores/esp8266/core_esp8266_features.h
+++ b/cores/esp8266/core_esp8266_features.h
@@ -105,8 +105,6 @@ uint64_t micros64(void);
 void delay(unsigned long);
 void delayMicroseconds(unsigned int us);
 
-void enableWiFiAtBootTime (void) __attribute__((noinline));
-
 #if defined(F_CPU) || defined(CORE_MOCK)
 #ifdef __cplusplus
 constexpr
diff --git a/doc/esp8266wifi/generic-class.rst b/doc/esp8266wifi/generic-class.rst
index 58e1fba3c..44b8e6e73 100644
--- a/doc/esp8266wifi/generic-class.rst
+++ b/doc/esp8266wifi/generic-class.rst
@@ -61,7 +61,7 @@ linker).
 
 .. code:: cpp
 
-    #include <ESP8266WiFi.h>    // necessary to avoid a linker error
+    #include <ESP8266WiFi.h>
 
     void setup () {
     #ifdef WIFI_IS_OFF_AT_BOOT
diff --git a/libraries/ESP8266WiFi/src/ESP8266WiFi.h b/libraries/ESP8266WiFi/src/ESP8266WiFi.h
index 819739eae..f31ffe002 100644
--- a/libraries/ESP8266WiFi/src/ESP8266WiFi.h
+++ b/libraries/ESP8266WiFi/src/ESP8266WiFi.h
@@ -53,6 +53,7 @@ extern "C" {
 #define DEBUG_WIFI(...) do { (void)0; } while (0)
 #endif
 
+extern "C" void enableWiFiAtBootTime (void) __attribute__((noinline));
 
 class ESP8266WiFiClass : public ESP8266WiFiGenericClass, public ESP8266WiFiSTAClass, public ESP8266WiFiScanClass, public ESP8266WiFiAPClass {
     public: