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Add build script part to FFI chapter for more clear and smooth learn … #440

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Add build script part to FFI chapter for more clear and smooth learn … #440

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Add build script part to FFI chapter for more clear and smooth learn …
RoggeOhta Jan 16, 2024
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Fix space character problem
RoggeOhta Jan 16, 2024
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23 changes: 23 additions & 0 deletions src/ffi.md
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Expand Up @@ -21,6 +21,29 @@ libc = "0.2.0"

[libc]: https://crates.io/crates/libc

## Prepare the build script

Because [snappy](https://github.com/google/snappy) is a static library by default. So there is no C++ std linked in the output artifact. In order to use this foreign library in Rust, we have to manually specify that we want to link stdc++ in our project. The easiest way to do this is by setting up a build script.

First edit `Cargo.toml`, inside `package` add `build = "build.rs"`.
```toml
[package]
...
build = "build.rs"
```

Then create a new file at the root of your workspace, named `build.rs`.
```rust
// build.rs
fn main() {
println!("cargo:rustc-link-lib=dylib=stdc++");
println!("cargo:rustc-link-search=<YOUR SNAPPY LIBRARY PATH>");
}
```

For more information, please read [The Cargo Book - build script](https://doc.rust-lang.org/cargo/reference/build-scripts.html).


## Calling foreign functions

The following is a minimal example of calling a foreign function which will
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