Make the fuchsia mojo/public repo the source of truth.

mojo/public/rust/build.rs

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-//! This build.rs generates some parameters for Cargo which are necessary to build.
-//! Particularly, it searches for libsystem_thunks.a.
-
-use std::env;
-use std::ffi::OsStr;
-use std::fs;
-use std::path::Path;
-use std::path::PathBuf;
-use std::vec::Vec;
-
-/// Searches a directory recursively for libsystem_thunks.a
-/// and returns the path if found, or None if not found.
-fn search_output(p: &Path, search_file: &OsStr) -> Option<PathBuf> {
-    let mut dirs = Vec::new();
-    let paths = fs::read_dir(p).unwrap();
-    for dir_entry in paths {
-        let path = dir_entry.unwrap().path();
-        if path.is_dir() {
-            dirs.push(path);
-        } else {
-            let found = match path.file_name() {
-                Some(name) => name == search_file,
-                None => false,
-            };
-            if found {
-                return Some(p.to_path_buf());
-            }
-        }
-    }
-    for path in dirs.iter() {
-        match search_output(path.as_path(), search_file) {
-            Some(thunks_path) => return Some(thunks_path),
-            None => continue,
-        }
-    }
-    None
-}
-
-fn main() {
-    let mojo_out_dir = Path::new(env!("MOJO_OUT_DIR"));
-    let embed = match env::var("MOJO_RUST_NO_EMBED") {
-        Ok(_) => false,
-        Err(_) => true,
-    };
-    if mojo_out_dir.is_dir() {
-        if !embed {
-            match search_output(mojo_out_dir, OsStr::new("libsystem_thunks.a")) {
-                Some(path) => {
-                    println!("cargo:rustc-link-lib=static=system_thunks");
-                    println!("cargo:rustc-link-search=native={}", path.display());
-                }
-                None => panic!("Failed to find system_thunks."),
-            }
-        } else {
-            println!("cargo:rustc-link-lib=stdc++");
-            match search_output(mojo_out_dir, OsStr::new("libvalidation_parser.a")) {
-                Some(path) => {
-                    println!("cargo:rustc-link-lib=static=validation_parser");
-                    println!("cargo:rustc-link-search=native={}", path.display());
-                }
-                None => panic!("Failed to find validation_parser."),
-            }
-            match search_output(mojo_out_dir, OsStr::new("librust_embedder.a")) {
-                Some(path) => {
-                    println!("cargo:rustc-link-lib=static=rust_embedder");
-                    println!("cargo:rustc-link-search=native={}", path.display());
-                }
-                None => panic!("Failed to find rust_embedder."),
-            }
-        }
-    } else {
-        panic!("MOJO_OUT_DIR is not a valid directory.");
-    }
-}