Yocto cross-compiling toolchains for Elk on Raspberry Pi
This is a meta-repository to host the Yocto toolchain needed to cross-compile binaries for Elk on Raspberry Pi 4 using your host computer.
The is available under the Releases section.
On pretty much any modern Linux distribution, you can simply run the self-extracting shell script and enter the desired extraction path when prompted. Then, simply source the environment script:
$ source /path/to/environment-setup-cortexa7t2hf-neon-vfpv4-elk-linux-gnueabiand you're ready to go. The environment script modifies the default toolchain for the session, so just e.g. running make or cmake will generate a binary for the target architecture.
By default, -g is added to the C/C++ compiler flags. If you want to compile binaries without symbols, just override the environment variables CFLAGS and CXXFLAGS, or run $STRIP on the generated binary.
If you're not running Linux on your host development machine, the first option is to run a Virtual Machine using e.g. VirtualBox or VMWare. Any recent Linux distribution will be ok to setup the toolchain.
Another option is to use Docker to setup a lightweight container more integrated with your host setup. This could also be useful for Linux if you want to isolate various toolchain environments from each other. For that, check out the elk-audio-builder repo that contains a customized image that we created for this purpose.