From 2f9b63275f0081f97437a0bea760e2644e6c036a Mon Sep 17 00:00:00 2001
From: 3d-gussner <3d.gussner@gmail.com>
Date: Wed, 30 May 2018 13:26:31 +0200
Subject: [PATCH] Fixed unused variable c as in pull request #138

---
 Firmware/MarlinSerial.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Firmware/MarlinSerial.h b/Firmware/MarlinSerial.h
index 5c2245df..615b7eb9 100644
--- a/Firmware/MarlinSerial.h
+++ b/Firmware/MarlinSerial.h
@@ -131,7 +131,7 @@ class MarlinSerial //: public Stream
                 if (M_UCSRxA & (1<<M_FEx)) {
                     // Characters received with the framing errors will be ignored.
                     // The temporary variable "c" was made volatile, so the compiler does not optimize this out.
-                    volatile unsigned char c = M_UDRx;
+                    (void)(*(char *)M_UDRx);
                 } else {
                     unsigned char c  =  M_UDRx;
                     int i = (unsigned int)(rx_buffer.head + 1) % RX_BUFFER_SIZE;
@@ -155,7 +155,7 @@ class MarlinSerial //: public Stream
                 if (UCSR1A & (1<<FE1)) {
                     // Characters received with the framing errors will be ignored.
                     // The temporary variable "c" was made volatile, so the compiler does not optimize this out.
-                    volatile unsigned char c = UDR1;
+                    (void)(*(char *)UDR1);
                 } else {
                     unsigned char c  =  UDR1;
                     int i = (unsigned int)(rx_buffer.head + 1) % RX_BUFFER_SIZE;