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add note on historicity platform encoding

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there have been discussions around migrating the platform description to a more structured representation like an attribute set (cannot find relevant issue for reference right now), and it is worth noting that this string encoding is fairly arbitrary.
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Valentin Gagarin 2021-12-15 11:01:47 +01:00 committed by fricklerhandwerk
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commit 12004ac36f
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source/tutorials/cross-compilation.md
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@ -62,6 +62,8 @@ for development), the platform config has to be constructed manually via the fol
<cpu>-<vendor>-<os>-<abi>
```
This string representation is used in `nixpkgs` for historic reasons.
Note that `<vendor>` is often `unknown` and `<abi>` is optional.
There's also no unique identifier for a platform, for example `unknown` and
`pc` are interchangeable (hence it's called config.guess).