Undefined reference to operator delete(void*) C++ AVR pure virtual and __cxa_pure_virtual()

 __cxa_pure_virtual()
&
Undefined reference to operator delete(void*)

C++ Programming for MCUs such as the Atmel AVR family can be both very productive and also very frustrating as one learns to work without libstdc++ when using certain MCU toolchains e.g.

• C++ AVR Studio 
• C++ avr-gcc 
• C++ Arduino 

Whilst it is generally well known that the MCU programmer must provide their own versions of new and delete[1] it is less well known that the C++ programmer using pure virtual member functions must provide an implementation for __cxa_purevirtual() or face some very confusing errors!

Depeding on toolchain the programmer may be lucky and be notified:

undefined reference to `__cxa_pure_virtual'

What is __cxa_purevirtual()?[2]

Lovin' the TinyDuino mini Atmel 328 Arduino Board

My TinyDuino - what a perfect distraction!

• Atmel ATmega328P Microcontroller
• 32KB Flash, 2KB RAM, 1KB EEPROM
• 1.2mA (typical) @ 3V, 4MHz
• Default Clock speed: 8MHz
• 2.7V – 5.5V operating voltage (Arduino mode)
• 1.8V – 5.5V operating voltage (with custom fw)
• 20 I/Os (14 Digital, 6 Analog / Digital I/O) – All the signals on the Arduino Shield connectors are supported!
• Arduino Bootloader preprogrammed (uses approx 0.5 KBytes of Flash Memory)

This build is rocking the TinyShield USB & ICP programming shield, TinyShield microSD and TinyShield 16 Edge LEDs.