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

Syntax error about "__weak","__attribute__((weak))"

Thanks skoehler, for that ranty suggestion. That solved it for me! :-)
I don’t understand what you mean about the CDT Indexer POV but getting rid of the quotes made the warnings go away and those functions became available in the project.

Every f***ing time I regenerate the sources of my project with CubeMX, I have to remove those quotes. They don’t belong there and certainly result in invalid syntax (from the CDT Indexer point of view).