Tangentially, libraries for microcontrollers (e.g. nanolib) will typically use sbrk(). To port the library to a new architecture for the memory stuff you usuall

Tangentially, libraries for microcontrollers (e.g. nanolib) will typically use sbrk(). To port the library to a new architecture for the memory stuff you usually implement sbrk() yourself, and this will be sufficient for malloc and friends to compile