Update cheatsheets

rustc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# rustc
+
+> The Rust compiler.
+> Rust projects usually use `cargo` instead of invoking `rustc` directly.
+> More information: <https://doc.rust-lang.org/rustc>.
+
+- Compile a binary crate:
+
+`rustc {{path/to/main.rs}}`
+
+- Compile with optimizations (`s` means optimize for binary size; `z` is the same with even more optimizations):
+
+`rustc -C lto -C opt-level={{0|1|2|3|s|z}} {{path/to/main.rs}}`
+
+- Compile with debugging information:
+
+`rustc -g {{path/to/main.rs}}`
+
+- Explain an error message:
+
+`rustc --explain {{error_code}}`
+
+- Compile with architecture-specific optimizations for the current CPU:
+
+`rustc -C target-cpu={{native}} {{path/to/main.rs}}`
+
+- Display the target list (Note: you have to add a target using `rustup` first to be able to compile for it):
+
+`rustc --print target-list`
+
+- Compile for a specific target:
+
+`rustc --target {{target_triple}} {{path/to/main.rs}}`