I’m encountering an issue when attempting to compile a project for Arduino Mega2560.  This project compiles correctly in the Arduino IDE – I’ve tried vanilla 1.6.7 and am presently using 1.6.8 Hourly Build 2016/01/27 03:44, upgrading didn’t help the issue.
 
Sketch uses 60,870 bytes (23%) of program storage space. Maximum is 253,952 bytes.
Global variables use 3,120 bytes (38%) of dynamic memory, leaving 5,072 bytes for local variables. Maximum is 8,192 bytes.
 
 
However when compiling with Visual Micro Release (1602.13) - 13th February 2016 (and many previous releases) I get the error:
 
Compiling 'SampleProgram' for 'Arduino/Genuino Mega w/ ATmega2560 (Mega 2560)'
libc.a(isprint.o)*:In function `isprint
(.text.avr-libc+0x6)*:relocation truncated to fit: R_AVR_13_PCREL against symbol `__ctype_isfalse' defined in .text.avr-libc section in c:\program files r6\libc.a(cty_isfalse.o)
collect2.exe*:error: ld returned 1 exit status
Error creating .elf
 
I’m using Visual Studio 2015 Pro, v14.0.24720.00 Update 1.  Visual Micro is set to use Arduino 1.6 with Arduino/Genuino Mega w/ ATmega2560 (Mega 2560) option.   I have built, rebuilt, cleaned the compilation, no difference.  Deep Search Includes enabled/disabled makes no difference.  If I turn on verbose messages and do a clean build I get the info below.  Some information has been redacted.
 
 
Any suggestions as to how to resolve?  Given that Arduino IDE compiles OK I’m assuming it’s a Visual Micro issue, but..

Hi,

Did you try with the current release f arduino 1.6.7. I haven't tried the beta that you have installed yet. The hourly beta builds can change very quickly.

Hopefully okay with 1.6.7 release

please zip and email your project to info[at]visualmicro.com

Thanks, yes Visual micro isn't forcing the -relax switch for the mega compile. It's a hard coded compiler flag that sits  outside of the std arduino config. I checked it a few months ago so am surprised to see it missing.

I will fix this weekend but you can probably fix it yourself by adding -relax to the c/cpp extra flags in the visual micro project properties

Sorry I missed that and thanks for the pointer.

All compiling fine now, thanks!