Steps to Cross-compile for RPi (including older, ARMv6 architectures)

1. Get the cross compiler as described in this repo.

2. Extract into /opt/cross-pi-gcc

3. Get the toolchain.make file from the current repo.

4. Sync (using rsync) the following folders into a "rootfs" folder. Folders to be synced from RPi:

   • /lib
   • /usr
   • /opt/vc/lib

   Use The following command for the rsync:

   rsync -vR --progress -rl --delete-after --safe-links [email protected]:/{lib,usr,opt/vc/lib} $HOME/rpi/rootfs
   

5. Set the environment variable $RASPBIAN_ROOTFS to point to the rootfs folder.

6. In VSCode install cmake-tools extension

7. Press Ctrl-Shift-P to open context menu and select CMake: Edit User-Local CMake Kits

8. Add the following configuration in CMake Kits (at the end of the file is ok):

    {
        "name": "RaspberryPi Zero cross compile using toolchain.cmake",
        "toolchainFile": "<path to toolchain.cmake>"
    }
   

9. Then use VSCode to configure and run the build (from cmake-tools)