Atmel studio 7

Compiling 'vmicro_test_1' for 'Arduino M0 Pro (Programming Port)'
Build Folder: bg/Release"
Summary: Header=1 Prototypes=3 Imports=0
Additional Defines:
Architecture Tools: eabi-gcc/7-2017q4/bin/"
Api: 1.1911.23-0
Sketch Book: "file:///C:/Users/chris/OneDrive/Documents/Arduino"
Sketch Include Paths
Core Include Paths
Include Path .8.3/cores/arduino"
Include Path .8.3/variants/arduino_mzero"

Deep search for libraries ...
\7-2017q4\bin\arm-none-eabi-g++" -mcpu=cortex-m0plus -mthumb -c -g -Os -w -std=gnu++11 -ffunction-sections -fdata-sections -fno-threadsafe-statics -nostdlib --param max-inline-insns-single=500 -fno-rtti -fno-exceptions -w -x c++ -E -CC  -g -DVM_DEBUG_GDB   -DF_CPU=48000000L -DARDUINO=108011 -DARDUINO_SAM_ZERO -DARDUINO_ARCH_SAMD -D__SAMD21G18A__ -mthumb -DUSB_VID=0x2a03 -DUSB_PID=0x804f -DUSBCON -DUSB_MANUFACTURER="\"Unknown\"" -DUSB_PRODUCT="\"Arduino M0 Pro\"" IS/Include/" .0/CMSIS/Device/ATMEL/" ores\arduino" ariants\arduino_mzero" se\vmicro_test_1.cpp" -o "nul"

Building variant ...

  Using previously compiled variant

Building core ...

Building project code ...
  Using previously compiled file: e\vmicro_test_1.cpp.o

Linking it all together ...
# Coping cached core 2a27b\core.a to e\core.a

\7-2017q4/bin/arm-none-eabi-g++" ease" -Os -Wl,--gc-sections -save-temps ariants\arduino_mzero/linker_scripts/gcc/flash_with_bootloader.ld" dbg\Release/vmicro_test_1.ino.map" --specs=nano.specs --specs=nosys.specs -mcpu=cortex-m0plus -mthumb -Wl,--cref -Wl,--check-sections -Wl,--gc-sections -Wl,--unresolved-symbols=report-all -Wl,--warn-common -Wl,--warn-section-align -o se/vmicro_test_1.ino.elf" "vmicro_test_1.cpp.o" 12a27b\variant\variant.cpp.o" -Wl,--start-group IS/Lib/GCC/" -larm_cortexM0l_math -lm se/core.a" -Wl,--end-group

core.a(Uart.cpp.o)*: In function HardwareSerial::HardwareSerial()
HardwareSerial.h:67: undefined reference to vtable for HardwareSerial

Error linking for board Arduino M0 Pro (Programming Port)
Build failed for project 'vmicro_test_1'
  

It is on default optimization
It only happens on M0 (programming)  not M0 or uno

Things seem to keep changing.
here is where i am now.
Ihave attached two files
first is compiler output when set as M0 board.
it compiles fine, but wont download.
the second is set as M0 (programming port), shich is howit is connected.  It fails for a Hardware Serial fault.
Thoughts?

my settings are the same. see attached

This is because you have set the programmer to Atmel EDBG. Please unckeck vMicro>Upload>Always User programmer"

You are also in Debug mode, I suggest you set the tool bar to Release instead of Debug.

Another point is that the vMicro > Debugger and Optimization settings are set per configuration. Release is one configuration and Debug is another configuration. In this  last example core optimization is set to "No Project and Libraries". In your previous example optimization was set to "None or No Optimization". Optimization should always be On which is the default unless you are debugging. Most arduino boards do not allow "No Optimization" because of the HardwareSerial library.

yes i am in debug, because that is the reason I am using m0 board and atmel studio

Upload in Atmel Studo

If you do not want to use the default serial upload you can use Atmel device programming...

Atmel studio uses different usb drivers to the arduino ide. This means that most programmers fail therefore you wills ee that we recommend setting the "vMicro>Uploader>Progammer>Use Atmel Studio Device Programming"

Debugging in Amel Studio

Regardless of upload method, if you want to use the Atmel studio hardware debugger instead of Visual Micro serial debugger...

Check "vMicro>Debugger>Atmel Studio Debugging"



In Atmel studio, both options can apply only to atmel hardware which you have. I guess you have also set no optimization for project and libraries which is often preferred however some libraries have been written in a way that means they will not compile or link with librray optimization set. A future enhancement to visual micro will provide more granular control of which libraries remain optimized. To test things I suggest you leave optimization on which is the default.

Please post verbose output for the build so that we can see your settings now.

That message you see will only appear if you use one of the other programmers. You need to stay in release mode until you prove the upload tool you want to use. 

Out of interest what are you clicking in the arduino ide to upload? If you are not clicking the special "Upload using programmer" menu item in arduino then you are using the standard upload which will be serial/COM.

Let's get past the upload issues which is unrelated to debugging then look at debugging.

Okay so that shows that you just need to use the standard serial upload in visual micro. The arduino ide has confused things for you because it always shows a programmer is selected but it is not used.

In Visual Micro please switch off the "use programmer" in the upload settings and confirm that the upload is then using your COM port.

Thanks

found output in micro build output