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feat: Add crate nix-c-raw

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See README. Most of this is in accordance with the bindgen introduction.

The c_headers function was taken from Zach Mitchell's work on bindings.

Co-authored-by: Zach Mitchell <zmitchell@fastmail.com>
(cherry picked from commit 83d8ae6b26d341bbd452a77d7361f58c06a2d322)
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Robert Hensing 2024-02-16 09:45:29 +01:00
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# nix-c-raw
This crate contains generated bindings for the Nix C API.
**You should not have to use this crate directly,** and so you should probably not add it to your dependencies.
Instead, use the `nix-util`, `nix-store` and `nix-expr` crates, which _should_ be sufficient.
## Design
Rust bindgen currently does not allow "layered" libraries to be split into separate crates.
For example, the expr crate would have all-new types that are distinct and incompatible with the store crate.
Ideally bindgen will support reusing already generated modules, and we could move the code generation into the appropriate crates, so that the system dependencies of each crate become accurate.