STM32MP1 support available in SW4STM32

   With System Workbench for Linux, Embedded Linux on the STM32MP1 family of MPUs from ST was never as simple to build and maintain, even for newcomers in the Linux world.
And, if you install System Workbench for Linux in System Workbench for STM32 you can seamlessly develop and debug asymmetric applications running partly on Linux, partly on the Cortex-M4; you can download a short video showcasing this on the ac6-tools website (registration required).

System Workbench for STM32

Semihosting with OpenSTM32 and STM32F446RE Nucleo

Your project is in C++. The C functions from libraries should be declared in extern “C” to be used in C++.

Replace :
extern void initialise_monitor_handles(void);
extern “C” void initialise_monitor_handles(void);

Hope it works,