I'm getting something similar and a lot of missing file error messages like stdlib.h etc.

The board has been added using the board manager and is listed in the text as the Adafruit-Feather_M0 so I know the board and library are there.

The error I see is:

Deep search for libraries ...
"{runtime.tools.arm-none-eabi-gcc.path}\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   -DF_CPU=48000000L -DARDUINO=10807 -DARDUINO_SAMD_ZERO -DARDUINO_ARCH_SAMD -DARDUINO_SAMD_ZERO -DARM_MATH_CM0PLUS -DADAFRUIT_FEATHER_M0 -D__SAMD21G18A__ -DUSB_VID=0x239A -DUSB_PID=0x800B -DUSBCON -DUSB_MANUFACTURER="\"Adafruit\"" -DUSB_PRODUCT="\"Feather M0\"" "-I/CMSIS/Include/" "-I/CMSIS/Device/ATMEL/" -I"C:\Users\cliff\AppData\Local\arduino15\packages\adafruit\hardware\samd\1.2.8\cores\arduino" -I"C:\Users\cliff\AppData\Local\arduino15\packages\adafruit\hardware\samd\1.2.8\variants\feather_m0" "C:\Users\cliff\AppData\Local\Temp\VMBuilds\OpenBionics_Beetroot\adafruit_adafruit_feather_m0\Release\OpenBionics_Beetroot.cpp" -o "nul"
The system cannot find the file specified
     Preprocess: "{runtime.tools.arm-none-eabi-gcc.path}\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   -DF_CPU=48000000L -DARDUINO=10807 -DARDUINO_SAMD_ZERO -DARDUINO_ARCH_SAMD -DARDUINO_SAMD_ZERO -DARM_MATH_CM0PLUS -DADAFRUIT_FEATHER_M0 -D__SAMD21G18A__ -DUSB_VID=0x239A -DUSB_PID=0x800B -DUSBCON -DUSB_MANUFACTURER="\"Adafruit\"" -DUSB_PRODUCT="\"Feather M0\"" "-I/CMSIS/Include/" "-I/CMSIS/Device/ATMEL/" -I"C:\Users\cliff\AppData\Local\arduino15\packages\adafruit\hardware\samd\1.2.8\cores\arduino" -I"C:\Users\cliff\AppData\Local\arduino15\packages\adafruit\hardware\samd\1.2.8\variants\feather_m0" "C:\Users\cliff\AppData\Local\Temp\VMBuilds\OpenBionics_Beetroot\adafruit_adafruit_feather_m0\Release\OpenBionics_Beetroot.cpp" -o "nul"
   Object reference not set to an instance of an object



     An error was encountered during the 'Deep Search' library discovery process.


Thanks.

TO add to this the project builds in the Arduino IDE with no issue just won't build in VS17 with the vMicro build button.

Sorry for the delay, the M0 package will be retested during the next week.

Hi.

Just to further add in case it helps but I have added the Arduino Extension to VSCode and it builds fine in VSCode as well.

Thanks for looking into this though.