[gnoduino] arduino: resync to git master

[Lucian Langa <lucilanga src gnome org>]

commit 85100a452b2523a93ca0d8d1e419f70084cbb946
Author: Pascal de Bruijn <pmjdebruijn pcode nl>
Date:   Thu Aug 14 18:17:57 2014 +0200

    arduino: resync to git master

 hardware/arduino/cores/arduino/Arduino.h |    2 ++
 hardware/arduino/cores/arduino/main.cpp  |    3 +++
 2 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/hardware/arduino/cores/arduino/Arduino.h b/hardware/arduino/cores/arduino/Arduino.h
old mode 100644
new mode 100755
index 56caee6..a136d6c
--- a/hardware/arduino/cores/arduino/Arduino.h
+++ b/hardware/arduino/cores/arduino/Arduino.h
@@ -115,6 +115,8 @@ typedef uint8_t byte;
 void init(void);
 void initVariant(void);
 
+int atexit(void (*func)()) __attribute__((weak));
+
 void pinMode(uint8_t, uint8_t);
 void digitalWrite(uint8_t, uint8_t);
 int digitalRead(uint8_t);
diff --git a/hardware/arduino/cores/arduino/main.cpp b/hardware/arduino/cores/arduino/main.cpp
index d9413d2..c6c4391 100644
--- a/hardware/arduino/cores/arduino/main.cpp
+++ b/hardware/arduino/cores/arduino/main.cpp
@@ -19,6 +19,9 @@
 
 #include <Arduino.h>
 
+//Declared weak in Arduino.h to allow user redefinitions.
+int atexit(void (*func)()) { return 0; }
+
 // Weak empty variant initialization function.
 // May be redefined by variant files.
 void initVariant() __attribute__((weak));