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diff --git a/third_party/rust/cranelift-codegen/src/lib.rs b/third_party/rust/cranelift-codegen/src/lib.rs
new file mode 100644
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+++ b/third_party/rust/cranelift-codegen/src/lib.rs
@@ -0,0 +1,125 @@
+//! Cranelift code generation library.
+#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
+#![warn(unused_import_braces)]
+#![cfg_attr(feature = "std", deny(unstable_features))]
+#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
+#![cfg_attr(feature="cargo-clippy", allow(
+// Produces only a false positive:
+                clippy::while_let_loop,
+// Produces many false positives, but did produce some valid lints, now fixed:
+                clippy::needless_lifetimes,
+// Generated code makes some style transgressions, but readability doesn't suffer much:
+                clippy::many_single_char_names,
+                clippy::identity_op,
+                clippy::needless_borrow,
+                clippy::cast_lossless,
+                clippy::unreadable_literal,
+                clippy::assign_op_pattern,
+                clippy::empty_line_after_outer_attr,
+// Hard to avoid in generated code:
+                clippy::cognitive_complexity,
+                clippy::too_many_arguments,
+// Code generator doesn't have a way to collapse identical arms:
+                clippy::match_same_arms,
+// These are relatively minor style issues, but would be easy to fix:
+                clippy::new_without_default,
+                clippy::should_implement_trait,
+                clippy::len_without_is_empty))]
+#![cfg_attr(
+    feature = "cargo-clippy",
+    warn(
+        clippy::float_arithmetic,
+        clippy::mut_mut,
+        clippy::nonminimal_bool,
+        clippy::map_unwrap_or,
+        clippy::unicode_not_nfc,
+        clippy::use_self
+    )
+)]
+#![no_std]
+// Various bits and pieces of this crate might only be used for one platform or
+// another, but it's not really too useful to learn about that all the time. On
+// CI we build at least one version of this crate with `--features all-arch`
+// which means we'll always detect truly dead code, otherwise if this is only
+// built for one platform we don't have to worry too much about trimming
+// everything down.
+#![cfg_attr(not(feature = "all-arch"), allow(dead_code))]
+
+#[allow(unused_imports)] // #[macro_use] is required for no_std
+#[macro_use]
+extern crate alloc;
+
+#[cfg(feature = "std")]
+#[macro_use]
+extern crate std;
+
+#[cfg(not(feature = "std"))]
+use hashbrown::{hash_map, HashMap, HashSet};
+#[cfg(feature = "std")]
+use std::collections::{hash_map, HashMap, HashSet};
+
+pub use crate::context::Context;
+pub use crate::legalizer::legalize_function;
+pub use crate::value_label::{ValueLabelsRanges, ValueLocRange};
+pub use crate::verifier::verify_function;
+pub use crate::write::write_function;
+
+pub use cranelift_bforest as bforest;
+pub use cranelift_entity as entity;
+
+pub mod binemit;
+pub mod cfg_printer;
+pub mod cursor;
+pub mod data_value;
+pub mod dbg;
+pub mod dominator_tree;
+pub mod flowgraph;
+pub mod ir;
+pub mod isa;
+pub mod loop_analysis;
+pub mod machinst;
+pub mod print_errors;
+pub mod settings;
+pub mod timing;
+pub mod verifier;
+pub mod write;
+
+pub use crate::entity::packed_option;
+
+mod abi;
+mod bitset;
+mod constant_hash;
+mod context;
+mod dce;
+mod divconst_magic_numbers;
+mod fx;
+mod inst_predicates;
+mod iterators;
+mod legalizer;
+mod licm;
+mod nan_canonicalization;
+mod partition_slice;
+mod postopt;
+mod predicates;
+mod redundant_reload_remover;
+mod regalloc;
+mod remove_constant_phis;
+mod result;
+mod scoped_hash_map;
+mod simple_gvn;
+mod simple_preopt;
+mod stack_layout;
+mod topo_order;
+mod unreachable_code;
+mod value_label;
+
+#[cfg(feature = "enable-peepmatic")]
+mod peepmatic;
+
+#[cfg(feature = "souper-harvest")]
+mod souper_harvest;
+
+pub use crate::result::{CodegenError, CodegenResult};
+
+/// Version number of this crate.
+pub const VERSION: &str = env!("CARGO_PKG_VERSION");