What even is cross-compilation?

Varied terms

Cross-compilation is the act of producing binaries for a “different system”.

There are two diffent ways this can apply.

Cross operating system

For example: building an application on MacOS, for Linux.

Cross CPU architecture

For example: building an application on x86_64 for aarch64.

Some questions to keep in mind

What is relevant for a build to succeed?
What is then needed by the output of this build?
Does the output of the build itself try to output more builds?

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