From 2b868aac00825c85feca1b47ac1a47ebf196f3a2 Mon Sep 17 00:00:00 2001
From: Victor Tseng <palatis@gmail.com>
Date: Fri, 29 Dec 2017 22:11:00 +0800
Subject: [PATCH] allow disabling global Serial and Serial1 object (#2807)

allow the user to disable specific global `Serial` objects to save
memory.

that's 0x1c bytes per object.
---
 cores/esp8266/HardwareSerial.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cores/esp8266/HardwareSerial.cpp b/cores/esp8266/HardwareSerial.cpp
index d78b239f1e..f2465be5a6 100644
--- a/cores/esp8266/HardwareSerial.cpp
+++ b/cores/esp8266/HardwareSerial.cpp
@@ -180,5 +180,10 @@ HardwareSerial::operator bool() const
 }
 
 
+#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL)
 HardwareSerial Serial(UART0);
+#endif
+#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL1)
 HardwareSerial Serial1(UART1);
+#endif
+