SW4STM32 and SW4Linux fully supports the STM32MP1 asymmetric multicore Cortex/A7+M4 MPUs

   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 get more information from the ac6-tools website and download two short videos (registration required) highlighting:

System Workbench for STM32

How to add an external library in a project?

For those who may have the same problem regarding symbols, I have understood my mistake:

To define them properly, define them in Project > Properties > C/C++ General > Paths & Symbols
Configuration : | All configurations | (this is where I wasn’t doing it correctly)

If you have to declare a symbol for a #if / #endif, add a value (1 for expl) to your symbol. Else, it won’t work.
If you have to declare a symbol for a #ifdef, you don’t need to add a value, as soon as you define it in the properties.

Hope it helps!

Also, if you’ve done what explained above but your compiler still can’t find your symbols, try:

projet > C/C++ Index > Freshen All Files
projet > C/C++ Index > Rebuild

It worked for me.