From c4c20ff47ac976e0d7b766e07465f08d12d26228 Mon Sep 17 00:00:00 2001
From: david gauchard <gauchard@laas.fr>
Date: Thu, 27 Aug 2020 21:45:25 +0200
Subject: [PATCH] getCpuFreqMHz(): fix when F_CPU is not defined

---
 cores/esp8266/Esp.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/cores/esp8266/Esp.h b/cores/esp8266/Esp.h
index b3e187fc52..77086890b0 100644
--- a/cores/esp8266/Esp.h
+++ b/cores/esp8266/Esp.h
@@ -127,10 +127,7 @@ class EspClass {
             return esp_get_cpu_freq_mhz();
         }
 #else
-        uint8_t getCpuFreqMHz() const
-        {
-            return esp_get_cpu_freq_mhz();
-        }
+        uint8_t getCpuFreqMHz() const;
 #endif
 
         uint32_t getFlashChipId();