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diff --git a/src/doc/book/redirects/conditional-compilation.md b/src/doc/book/redirects/conditional-compilation.md new file mode 100644 index 000000000..b25c02f74 --- /dev/null +++ b/src/doc/book/redirects/conditional-compilation.md @@ -0,0 +1,28 @@ +% Conditional Compilation + +<small>There is a new edition of the book and this is an old link.</small> + +> Sometimes one wants to have different compiler outputs from the same code, depending on build target, such as targeted operating system, or to enable release builds. +> Configuration options are either provided by the compiler or passed in on the command line using. +> Rust code then checks for their presence using the `#[cfg(...)]` attribute + +```rust +// The function is only included in the build when compiling for macOS +#[cfg(target_os = "macos")] +fn macos_only() { + // ... +} +``` + +--- + +This particular chapter does not exist in [the second edition][2]. +The best place to learn about it is [the Rust Reference][3]. + +* **[In the Rust Reference: Ch 5 — Conditional Compilation][3]** +* <small>[In the first edition: Ch 4.3 — Conditional Compilation][1]</small> + + +[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/conditional-compilation.html +[2]: index.html +[3]: ../reference/conditional-compilation.html |