packaging lightgbm-sys

lightgbm-sys/build.rs

@@ -2,20 +2,33 @@ extern crate bindgen;
 extern crate cmake;
 
 use cmake::Config;
+use std::process::Command;
 use std::env;
 use std::path::{Path, PathBuf};
 
 
 fn main() {
     let out_dir = env::var("OUT_DIR").unwrap();
-    let lgbm_root = Path::new(&out_dir);
+    let lgbm_root = Path::new(&out_dir).join("lightgbm");
+
+    // copy source code
+    if !lgbm_root.exists() {
+        Command::new("cp")
+            .args(&["-r", "lightgbm", lgbm_root.to_str().unwrap()])
+            .status()
+            .unwrap_or_else(|e| {
+                panic!("Failed to copy ./lightgbm to {}: {}", lgbm_root.display(), e);
+            });
+    }
 
     // CMake
-    let dst = Config::new("lightgbm")
+    let dst = Config::new(&lgbm_root)
         .profile("Release")
         .uses_cxx11()
         .define("BUILD_STATIC_LIB", "ON")
         .build();
+
+    // bindgen build
     let bindings = bindgen::Builder::default()
         .header("wrapper.h")
         .clang_args(&["-x","c++", "-std=c++11"])
@@ -27,7 +40,7 @@ fn main() {
         .write_to_file(out_path.join("bindings.rs"))
         .expect("Couldn't write bindings.");
 
-    println!("cargo:rustc-link-search={}", lgbm_root.join("lib").display());
+    println!("cargo:rustc-link-search={}", out_path.join("lib").display());
     println!("cargo:rustc-link-lib=dylib=gomp");
     println!("cargo:rustc-link-lib=stdc++");
     println!("cargo:rustc-link-search=native={}", dst.display());