Directly include file from build directory instead of copying in build script

build.rs

@@ -28,37 +28,13 @@ pub mod dynamic;
 #[path = "build/static.rs"]
 pub mod r#static;
 
-/// Copies a file.
-#[cfg(feature = "runtime")]
-fn copy(source: &str, destination: &Path) {
-    use std::fs::File;
-    use std::io::{Read, Write};
-
-    let mut string = String::new();
-    File::open(source)
-        .unwrap()
-        .read_to_string(&mut string)
-        .unwrap();
-    File::create(destination)
-        .unwrap()
-        .write_all(string.as_bytes())
-        .unwrap();
-}
-
 /// Copies the code used to find and link to `libclang` shared libraries into
 /// the build output directory so that it may be used when linking at runtime.
 #[cfg(feature = "runtime")]
 fn main() {
-    use std::env;
-
     if cfg!(feature = "static") {
         panic!("`runtime` and `static` features can't be combined");
     }
-
-    let out = env::var("OUT_DIR").unwrap();
-    copy("build/macros.rs", &Path::new(&out).join("macros.rs"));
-    copy("build/common.rs", &Path::new(&out).join("common.rs"));
-    copy("build/dynamic.rs", &Path::new(&out).join("dynamic.rs"));
 }
 
 /// Finds and links to the required libraries dynamically or statically.

src/link.rs

@@ -190,7 +190,7 @@ https://docs.rs/clang-sys/latest/clang_sys/{0}/index.html
 
 Instructions for installing `libclang` can be found here:
 https://rust-lang.github.io/rust-bindgen/requirements.html
-"#, 
+"#,
                             stringify!($name),
                             library
                                 .version()
@@ -226,9 +226,9 @@ https://rust-lang.github.io/rust-bindgen/requirements.html
         pub fn load_manually() -> Result<SharedLibrary, String> {
             #[allow(dead_code)]
             mod build {
-                include!(concat!(env!("OUT_DIR"), "/macros.rs"));
-                pub mod common { include!(concat!(env!("OUT_DIR"), "/common.rs")); }
-                pub mod dynamic { include!(concat!(env!("OUT_DIR"), "/dynamic.rs")); }
+                include!("../build/macros.rs");
+                pub mod common { include!("../build/common.rs"); }
+                pub mod dynamic { include!("../build/dynamic.rs"); }
             }
 
             let (directory, filename) = build::dynamic::find(true)?;