Sharing the shared state cache
The Yocto project builds everything from source. When you create a new project, only the configuration files are created. The build process then compiles everything from scratch, including the cross-compilation toolchain and some native tools important for the build.
This process can take a long time, and the Yocto project implements a shared state cache mechanism that is used for incremental builds with the aim to build only the strictly necessary components for a given change.
For this to work, the build system calculates a checksum of the given input data to a task. If the input data changes, the task needs to be rebuilt. In simplistic terms, the build process generates a run script for each task that can be checksummed ...
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