I have also set up an RPi3 and also have the Raspbian tool chain set up in an Ubuntu 16.04 environment. I have successfully cross-compiled the Rasbian kernel and booted it. I also cross-compiled some simple GTK+ apps to make sure I have the arm libs needed available to the toolchain and work. This works fine.
As prep for cross-compilling LC I have cloned the current "Develop" branch Livecode-Liveode git repo and built for Linux. The build process was a little confusing and under documented (for example needing to separately clone and move in the Livecode-thirdparty & Livecode-IDE repos) I configured the build for Linux)x86) and built it but the output was some parts of LC in the output directory but not organized anything like the installer sets up for the linux environment. I wasn't clear how to run it from this set of pieces.
With additional information I plan to get the arm-v6 build working for LC8 (which will work on any Pi, including the 3) and then attempt to clone that and make changes so it will compile for arm-v7 (RPi 3)
If that all works the stretch goal will be to build an LC external that gives access to the GPIO/I2C facilities on the Pi. One of the main ways lots of example GPIO projects are done is in Python, which is fine but for teaching younger kids I think LC would be a far superior environment. Be really cool to have LC running your robot arm
1) Are there a more comprehensive set of build instructions that let you build a complete LC system with installer, IDE, various engines, etc. organized like the installer installs it?
2) Was anyone able to locate more detailed doc or notes from the original maintainer of the RPi-arm version?
3) Are the pull requests submitted on by livecodefrazier on 10-Dec-2015 (#3398) going to be committed? They look like they are needed (at a minimum) to build the the rpi target.
I am fine with cross-compiling and the Raspberry arm-hf tool chain is solid. I am having to bootstrap myself on how the gyp files work and where additional changes might be needed to get good build for RPi. I have taken this on as my first 2017 project & I think I can get it done if I can get some info I need to move forward.