Remove gen_build_deps module.

lib/codegen-meta/src/gen_build_deps.rs

@@ -1,48 +0,0 @@
-//! Generate build dependencies for Cargo.
-//!
-//! The `build.rs` script is invoked by cargo when building lib/codegen to
-//! generate Rust code from the instruction descriptions. Cargo needs to know when
-//! it is necessary to rerun the build script.
-//!
-//! If the build script outputs lines of the form:
-//!     cargo:rerun-if-changed=/path/to/file
-//!
-//! cargo will rerun the build script when those files have changed since the last
-//! build.
-
-use error;
-
-use std::fs;
-use std::path;
-
-/// Recursively find all interesting source files and directories in the
-/// directory tree starting at `dir`. Yield a path to each file.
-fn source_files(dir: &path::PathBuf) -> Result<Vec<String>, error::Error> {
-    let mut files = Vec::new();
-    if dir.is_dir() {
-        for entry in fs::read_dir(&dir)? {
-            let entry = entry?;
-            let path = entry.path();
-            if path.is_dir() {
-                let mut child_dir_files = source_files(&path)?;
-                files.append(&mut child_dir_files);
-            } else if let Some(ext) = path.extension() {
-                if ext == "rs" {
-                    files.push(path.to_str().unwrap().to_string());
-                }
-            }
-        }
-    }
-    Ok(files)
-}
-
-/// Generate the lines of `cargo:rerun-if-changed` output, for each Rust source
-/// file inside of the cranelift-codegen-meta crate.
-pub fn generate(meta_dir: &path::PathBuf) -> Result<(), error::Error> {
-    println!("Dependencies from Rust meta language directory:");
-    source_files(&meta_dir)?
-        .into_iter()
-        .for_each(|p| println!("cargo:rerun-if-changed={}", p));
-
-    Ok(())
-}

lib/codegen-meta/src/lib.rs

@@ -1,5 +1,4 @@
 pub mod error;
-pub mod gen_build_deps;
 pub mod gen_types;
 
 mod base;

lib/codegen/build.rs

@@ -80,22 +80,9 @@ fn main() {
     // Now that the Python build process is complete, generate files that are
     // emitted by the `cretonne_codegen_meta` crate.
     // ------------------------------------------------------------------------
-
-    // Identify the directory of the Rust codegen-meta external crate.
-    let rust_meta_dir = crate_dir
-        .parent()
-        .map(|d| d.join("codegen-meta"))
-        .unwrap_or_else(|| {
-            eprintln!("Error: Could not find path to lib/codegen-meta crate.");
-            process::exit(1);
-        });
-
     if let Err(err) = meta::gen_types::generate("new_types.rs", &out_dir) {
         eprintln!("Error: {}", err);
         process::exit(1);
-    } else if let Err(err) = meta::gen_build_deps::generate(&rust_meta_dir) {
-        eprintln!("Error: {}", err);
-        process::exit(1);
     }
 }