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When I use Arduino to attempt to update the firmware I get a compile error:

Arduino: 1.8.3 (Windows 10), Board: "Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"

In file included from sketch\Marlin_main.cpp:47:0:

sketch\language.h:36:0: warning: "MACHINE_NAME" redefined

#define MACHINE_NAME "MeCreator 2 "

^

In file included from sketch\Marlin.h:22:0,

from sketch\Marlin_main.cpp:30:

sketch\Configuration.h:6:0: note: this is the location of the previous definition

#define MACHINE_NAME MECREATOR2

^

sketch\Marlin_main.cpp:2678:36: warning: invalid suffix on literal; C++11 requires a space between literal and string macro [-Wliteral-suffix]

LCD_MESSAGEPGM(MACHINE_NAME" "MSG_OFF".");

^

In file included from sketch\SdFile.h:27:0,

from sketch\cardreader.h:8,

from sketch\Marlin_main.cpp:44:

SdBaseFile.h:38: error: using typedef-name 'fpos_t' after 'struct'

struct fpos_t {

^

In file included from sketch\Marlin.h:10:0,

from sketch\Marlin_main.cpp:30:

c:\program files (x86)\arduino\hardware\tools\avr\avr\include\stdio.h:950:33: note: 'fpos_t' has a previous declaration here

__extension__ typedef long long fpos_t;

^

exit status 1
using typedef-name 'fpos_t' after 'struct'

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

there are some problems in defining name without using string，such as“ #define MACHINE_NAME MECREATOR2 ”which should be replaced by“ #define MACHINE_NAME "MECREATOR2" ”

When trying to install the 3DTouch auto leveling sensor, I had problem to compile the Marlin code on Arduino IDE and got the error:

using typedef-name 'fpos_t' after 'struct'

( GT2560 rev-A board )

I found the solution on the Arduino forum.:
In your Arduino IDE go to

1. Tools > Board > Boards Manager... > Arduino AVR Boards(click on it) > select 1.6.11 from the "Select version" menu > Install
2. After installation completes click the "Close" button

Now you can compile!

The problem is caused by the new compiler version included with Arduino AVR Boards 1.6.12 and later, it is more picky about the bad code that someone wrote. You will need to avoid upgrading to any Arduino AVR Boards version above 1.6.11 until someone fixes the problem in the Marlin code.

Hope this can help others