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doc: mention precompileModules #907

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doc: mention precompileModules
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2 changes: 2 additions & 0 deletions Manual/Runtime.lean
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Expand Up @@ -525,6 +525,8 @@ To run this code (e.g. with {keywordOf Lean.Parser.Command.eval}`#eval`), the fo
1. The module containing the declaration and its dependencies must be compiled into a shared library
1. This shared library should be provided to `lean --load-dynlib=` to run code that imports the module.

The `precompileModules` {ref "lake-config"}[configuration option] instructs Lake to do the above automatically.

It is not sufficient to load the foreign library containing the external symbol because the interpreter depends on code that is emitted for each {attr}`extern` declaration.
Thus it is not possible to interpret an {attr}`extern` declaration in the same file.
The Lean source repository contains an example of this usage in [`tests/compiler/foreign`](https://github.com/leanprover/lean4/tree/master/tests/compiler/foreign/).
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