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 (registration required) various documents highlighting:

System Workbench for STM32

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Converting to C++

How did you do the conversion ? (did you use option 1, below)

1) In Project Explorer right-click on project and then from contex menu choose “Convert to C++” option.

2) Change .project file:
to convert a C project to a C++ project, simply add: org.eclipse.cdt.core.ccnature
just below the line org.eclipse.cdt.core.cnature to the .project file generated by STM32CubeMX.

Let the generated files with the .c extension.
Add your files with the extension .cpp if you write C++ code.
Check the build output, for .cpp files should be invoked g++ compiler and for .c files gcc compiler

I did not try any of above on System Workbench, so I don’t know if works. I used second option on TrueStudio.