Linking .pio\build\uno\firmware.elf - error

[Alex-Pennington]

This is the first issue I've reported, please let me know if there's a format that should be followed and I'll reformat this post.

Processing uno (platform: atmelavr; board: uno; framework: arduino)
-----------------------------------------------------------------------------------------Verbose mode can be enabled via `-v, --verbose` option
CONFIGURATION: https://docs.platformio.org/page/boards/atmelavr/uno.html
PLATFORM: Atmel AVR (4.1.0) > Arduino Uno
HARDWARE: ATMEGA328P 16MHz, 2KB RAM, 31.50KB Flash   
DEBUG: Current (avr-stub) External (avr-stub, simavr)
PACKAGES:
 - framework-arduino-avr @ 5.1.0
 - toolchain-atmelavr @ 1.70300.191015 (7.3.0)       
Converting GPSClient.ino
LDF: Library Dependency Finder -> https://bit.ly/configure-pio-ldf
LDF Modes: Finder ~ chain, Compatibility ~ soft
[nanopb] Installing Protocol Buffers dependencies
Requirement already satisfied: protobuf>=3.19.1 in c:\users\user\.platformio\penv\lib\site-packages (4.23.4)

[notice] A new release of pip is available: 23.0.1 -> 23.2
[notice] To update, run: C:\Users\USER\.platformio\penv\Scripts\python.exe -m pip install --upgrade pip
[nanopb] No generation needed.
Found 6 compatible libraries
Scanning dependencies...
Dependency Graph
|-- Nanopb @ 0.4.7
Building in release mode
Compiling .pio\build\uno\src\GPSClient.ino.cpp.o
Compiling .pio\build\uno\libfc9\Nanopb\pb_common.c.o
Compiling .pio\build\uno\libfc9\Nanopb\pb_decode.c.o
Compiling .pio\build\uno\libfc9\Nanopb\pb_encode.c.o
Archiving .pio\build\uno\libFrameworkArduinoVariant.a
Archiving .pio\build\uno\libfc9\libNanopb.a
Compiling .pio\build\uno\FrameworkArduino\CDC.cpp.o
Compiling .pio\build\uno\FrameworkArduino\HardwareSerial.cpp.o
Compiling .pio\build\uno\FrameworkArduino\HardwareSerial0.cpp.o
Compiling .pio\build\uno\FrameworkArduino\HardwareSerial1.cpp.o
Compiling .pio\build\uno\FrameworkArduino\HardwareSerial2.cpp.o
Compiling .pio\build\uno\FrameworkArduino\HardwareSerial3.cpp.o
Compiling .pio\build\uno\FrameworkArduino\IPAddress.cpp.o
Compiling .pio\build\uno\FrameworkArduino\PluggableUSB.cpp.o
Compiling .pio\build\uno\FrameworkArduino\Print.cpp.o
Compiling .pio\build\uno\FrameworkArduino\Stream.cpp.o
Compiling .pio\build\uno\FrameworkArduino\Tone.cpp.o
Compiling .pio\build\uno\FrameworkArduino\USBCore.cpp.o
Compiling .pio\build\uno\FrameworkArduino\WInterrupts.c.o
Compiling .pio\build\uno\FrameworkArduino\WMath.cpp.o
Compiling .pio\build\uno\FrameworkArduino\WString.cpp.o
Compiling .pio\build\uno\FrameworkArduino\abi.cpp.o
Compiling .pio\build\uno\FrameworkArduino\hooks.c.o
Compiling .pio\build\uno\FrameworkArduino\main.cpp.o
Compiling .pio\build\uno\FrameworkArduino\new.cpp.o
Compiling .pio\build\uno\FrameworkArduino\wiring.c.o
Compiling .pio\build\uno\FrameworkArduino\wiring_analog.c.o
Compiling .pio\build\uno\FrameworkArduino\wiring_digital.c.o
Compiling .pio\build\uno\FrameworkArduino\wiring_pulse.S.o
Compiling .pio\build\uno\FrameworkArduino\wiring_pulse.c.o
Compiling .pio\build\uno\FrameworkArduino\wiring_shift.c.o
Archiving .pio\build\uno\libFrameworkArduino.a
Linking .pio\build\uno\firmware.elf
C:\Users\USER\AppData\Local\Temp\ccxbHEiH.ltrans0.ltrans.o: In function `main':
<artificial>:(.text.startup+0x104): undefined reference to `mt_serial_init(signed char, signed char)'
<artificial>:(.text.startup+0x112): undefined reference to `mt_set_debug(bool)'
<artificial>:(.text.startup+0x18a): undefined reference to `mt_loop(unsigned long)'      
<artificial>:(.text.startup+0x1b0): undefined reference to `mt_request_node_report(void (*)(mt_node_t*, mt_nr_progress_t))'
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\uno\firmware.elf] Error 1

[GUVWAF]

Can you try again with version 0.0.2? Although the Arduino Uno probably doesn't have enough RAM.