I try to compile a Class library example and I  get this  compilation error:
collect2.exe*:error: ld returned 1 exit status
Error creating .elf

Here is the code:

#include "lcd_mio1.h"
Lcd_mioClass lcd;

void setup()
{
	lcd.init();
  /* add setup code here */

}

void loop()
{
	lcd.blink();
	delay(10);

  /* add main program code here */

}
 

and the library code

// lcd_mio.h

#ifndef _LCD_MIO_h
#define _LCD_MIO_h

#if defined(ARDUINO) && ARDUINO >= 100
	#include "arduino.h"
#else
	#include "WProgram.h"
#endif

class Lcd_mioClass
{



 public:

	 Lcd_mioClass();
	void init();
	void createChar(uint8_t, uint8_t[]);
	void clear();
	void print(uint8_t);
	void setCursor(uint8_t,uint8_t);
	void blink();
	void noBlink();
	//virtual size_t write(uint8_t);


};

extern Lcd_mioClass Lcd_mio1;

#endif

#include "lcd_mio1.h"

Lcd_mioClass::Lcd_mioClass() { init(); }

void Lcd_mioClass::init(){	}
void Lcd_mioClass::createChar(uint8_t n, uint8_t t[]) {  }
void Lcd_mioClass::clear() {  }
void Lcd_mioClass::print(uint8_t c) { Serial.print(c); }
void Lcd_mioClass::setCursor(uint8_t x, uint8_t y) {  }
//size_t Lcd_mioClass::write(uint8_t(c)) { Serial.print(c); }
void Lcd_mioClass::blink() { }
void Lcd_mioClass::noBlink() {  }
Lcd_mioClass Lcd_mio;


 

Compilation on 1.6.5 IDE is fine ....with Visual Micro I get this:
Compiling debug version of 'prova_lib' for 'Arduino/Genuino Mega w/ ATmega2560 (Mega 2560)'
Build folder: a2560
Additional Defines: VM_DEBUG;VM_DEBUG_ENABLE 1;VM_DEBUG_BANDWIDTH_THROTTLE_MS 100;VM_DEBUGGER_TYPE_HARDWARESERIAL 0;VM_DEBUGGER_TYPE_SOFTWARESERIAL 1;VM_DEBUGGER_TYPE_FASTSERIAL 2;VM_DEBUGGER_TYPE_USB 3;VM_DEBUGGER_TYPE_TEENSY 4;VM_DEBUGGER_TYPE_UART 5;VM_DEBUGGER_TYPE_USART 6;VM_DEBUGGER_TYPE_USBSERIAL 7;VM_DEBUGGER_TYPE_TTYUART 8;VM_DEBUGGER_TYPE_NET_CONSOLE 9;VM_DEBUGGER_TYPE_Uart 10;VM_DEBUGGER_TYPE_COSA 11;VM_DEBUGGER_TYPE VM_DEBUGGER_TYPE_HARDWARESERIAL;
Architecture Tools: d:\Program Files\Arduino\hardware\tools\avr/bin/
Sketchbook: file:\\\d:\users\pbecc\onedrive\Arduino
Core Include Paths
Include Path 'd:\Users\pbecc\OneDrive\Arduino\prova_lib'
Include Path 'd:\Program Files\Arduino\hardware\arduino\avr\cores\arduino'
Include Path 'd:\Program Files\Arduino\hardware\arduino\avr\variants\mega'
Library Include Paths (1)
Platform Libraries Root Include Paths
Include Path 'd:\Program Files\Arduino\libraries'
Include Path 'd:\Program Files\Arduino\hardware\arduino\avr\libraries'
Include Path 'd:\users\pbecc\onedrive\Arduino\libraries'
Build Core Paths: d:\Program Files\Arduino\hardware\arduino\avr\cores\arduino
"d:\Program Files\Arduino\hardware\tools\avr/bin/avr-gcc" -c -g -Os -w -ffunction-sections -fdata-sections -MMD -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10605 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -I"d:\Users\pbecc\OneDrive\Arduino\prova_lib" -I"d:\Program Files\Arduino\hardware\arduino\avr\cores\arduino" -I"d:\Program Files\Arduino\hardware\arduino\avr\variants\mega" -I"D:\Program Files\VisualStudio\Common7\IDE\Extensions\o2rxztqq.ggk\Micro Platforms\default\debuggers\VM_DBG" -I"d:\Program Files\Arduino\libraries" -I"d:\Program Files\Arduino\hardware\arduino\avr\libraries" -I"D:\Program Files\VisualStudio\Common7\IDE\Extensions\o2rxztqq.ggk\Micro Platforms\default\debuggers" -I"d:\users\pbecc\onedrive\Arduino\libraries" "D:\Program Files\VisualStudio\Common7\IDE\Extensions\o2rxztqq.ggk\Micro Platforms\default\debuggers\VM_DBG\VM_mem_check.c" -o M_DBG\VM_mem_check.c.o" -DVM_DEBUG -DVM_DEBUG_ENABLE=1 -DVM_DEBUG_BANDWIDTH_THROTTLE_MS=100 -DVM_DEBUGGER_TYPE_HARDWARESERIAL=0 -DVM_DEBUGGER_TYPE_SOFTWARESERIAL=1 -DVM_DEBUGGER_TYPE_FASTSERIAL=2 -DVM_DEBUGGER_TYPE_USB=3 -DVM_DEBUGGER_TYPE_TEENSY=4 -DVM_DEBUGGER_TYPE_UART=5 -DVM_DEBUGGER_TYPE_USART=6 -DVM_DEBUGGER_TYPE_USBSERIAL=7 -DVM_DEBUGGER_TYPE_TTYUART=8 -DVM_DEBUGGER_TYPE_NET_CONSOLE=9 -DVM_DEBUGGER_TYPE_Uart=10 -DVM_DEBUGGER_TYPE_COSA=11 -DVM_DEBUGGER_TYPE=VM_DEBUGGER_TYPE_HARDWARESERIAL
"d:\Program Files\Arduino\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10605 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -I"d:\Users\pbecc\OneDrive\Arduino\prova_lib" -I"d:\Program Files\Arduino\hardware\arduino\avr\cores\arduino" -I"d:\Program Files\Arduino\hardware\arduino\avr\variants\mega" -I"D:\Program Files\VisualStudio\Common7\IDE\Extensions\o2rxztqq.ggk\Micro Platforms\default\debuggers\VM_DBG" -I"d:\Program Files\Arduino\libraries" -I"d:\Program Files\Arduino\hardware\arduino\avr\libraries" -I"D:\Program Files\VisualStudio\Common7\IDE\Extensions\o2rxztqq.ggk\Micro Platforms\default\debuggers" -I"d:\users\pbecc\onedrive\Arduino\libraries" "D:\Program Files\VisualStudio\Common7\IDE\Extensions\o2rxztqq.ggk\Micro Platforms\default\debuggers\VM_DBG\VM_DBG.cpp" -o M_DBG\VM_DBG.cpp.o" -DVM_DEBUG -DVM_DEBUG_ENABLE=1 -DVM_DEBUG_BANDWIDTH_THROTTLE_MS=100 -DVM_DEBUGGER_TYPE_HARDWARESERIAL=0 -DVM_DEBUGGER_TYPE_SOFTWARESERIAL=1 -DVM_DEBUGGER_TYPE_FASTSERIAL=2 -DVM_DEBUGGER_TYPE_USB=3 -DVM_DEBUGGER_TYPE_TEENSY=4 -DVM_DEBUGGER_TYPE_UART=5 -DVM_DEBUGGER_TYPE_USART=6 -DVM_DEBUGGER_TYPE_USBSERIAL=7 -DVM_DEBUGGER_TYPE_TTYUART=8 -DVM_DEBUGGER_TYPE_NET_CONSOLE=9 -DVM_DEBUGGER_TYPE_Uart=10 -DVM_DEBUGGER_TYPE_COSA=11 -DVM_DEBUGGER_TYPE=VM_DEBUGGER_TYPE_HARDWARESERIAL
"d:\Program Files\Arduino\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -MMD -mmcu=atmega2560 -DF_CPU=16000000L -DARDUINO=10605 -DARDUINO_AVR_MEGA2560 -DARDUINO_ARCH_AVR -I"d:\Users\pbecc\OneDrive\Arduino\prova_lib" -I"d:\Program Files\Arduino\hardware\arduino\avr\cores\arduino" -I"d:\Program Files\Arduino\hardware\arduino\avr\variants\mega" -I"D:\Program Files\VisualStudio\Common7\IDE\Extensions\o2rxztqq.ggk\Micro Platforms\default\debuggers\VM_DBG" -I"d:\Program Files\Arduino\libraries" -I"d:\Program Files\Arduino\hardware\arduino\avr\libraries" -I"D:\Program Files\VisualStudio\Common7\IDE\Extensions\o2rxztqq.ggk\Micro Platforms\default\debuggers" -I"d:\users\pbecc\onedrive\Arduino\libraries" rova_lib.cpp" -o rova_lib.cpp.o" -DVM_DEBUG -DVM_DEBUG_ENABLE=1 -DVM_DEBUG_BANDWIDTH_THROTTLE_MS=100 -DVM_DEBUGGER_TYPE_HARDWARESERIAL=0 -DVM_DEBUGGER_TYPE_SOFTWARESERIAL=1 -DVM_DEBUGGER_TYPE_FASTSERIAL=2 -DVM_DEBUGGER_TYPE_USB=3 -DVM_DEBUGGER_TYPE_TEENSY=4 -DVM_DEBUGGER_TYPE_UART=5 -DVM_DEBUGGER_TYPE_USART=6 -DVM_DEBUGGER_TYPE_USBSERIAL=7 -DVM_DEBUGGER_TYPE_TTYUART=8 -DVM_DEBUGGER_TYPE_NET_CONSOLE=9 -DVM_DEBUGGER_TYPE_Uart=10 -DVM_DEBUGGER_TYPE_COSA=11 -DVM_DEBUGGER_TYPE=VM_DEBUGGER_TYPE_HARDWARESERIAL
"d:\Program Files\Arduino\hardware\tools\avr/bin/avr-gcc" -w -Os -Wl,--gc-sections -mmcu=atmega2560 -o rova_lib.elf" M_DBG\VM_mem_check.c.o" M_DBG\VM_DBG.cpp.o" rova_lib.cpp.o" ore.a" " -lm
prova_lib.ino:In function `setup
prova_lib.ino:init()
prova_lib.ino:In function `loop
prova_lib.ino:blink()
prova_lib.ino:In function `__static_initialization_and_destruction_0
prova_lib.ino:Lcd_mioClass()
collect2.exe*:error: ld returned 1 exit status
Error creating .elf
:-

Hello Tim
Happy New Year!

I updated VisualMicro as you suggested december 30th!

Can you please zip and email your sketch to info[at]visualmicro.com

Also try compiling in release mode to ensure that a breakpoint location is not causing confusion.

When you say "library" do you mean local sketch/project code class or a real arduino library?

Sorry I believe that 
......I have created this mess!

I believe I have modified (using windows explorer) the name of the library , but since Visual Studio keep track of the changes it reverted automatically to the previous files:

this has created confusion to the compiler and the consequent error. 

Forcing Visual Studio to accept externally modified files will solve the issue!
The debug has nothing to do with it!

Thanks anyhow .......

I have encountered a problem using Time.h library :

One example that compile end run with Ide 1.6.5 , compile but not run on Visual Micro

A doubt this may be due to a library name duplication that has been resolved for Arduino IDE in a way that can not be compatible  with Visual Micro, may be for the reason you stated above!

Should I start a new topic for this or give you the detail here?