Rewrite build.rs

build.rs

@@ -1,16 +1,11 @@
 extern crate cc;
-use std::process::Command;
 
 fn main() {
-	let output = Command::new("uname").output()
-						 .expect("failed to get uname");
-	let compiler = match output.stdout.as_slice() {
-		b"Darwin\n" => "x86_64-elf-gcc",
-		b"Linux\n" => "gcc",
-		_ => panic!("unknown os")
-	};
-    cc::Build::new()
-		.compiler(compiler)
+	let mut build = cc::Build::new();
+
+	let compiler = if build.get_compiler().is_like_clang() 
+					{ "x86_64-elf-gcc" } else {"gcc"};
+    build.compiler(compiler)
          .file("src/test.c")
          .compile("cobj");
 }