Rust binding: call cmake in build script

bindings/rust/Cargo.toml

@@ -18,10 +18,16 @@ description = "Rust bindings for the Unicorn emulator with utility functions"
 build = "build.rs"
 links = "unicorn"
 
+[features]
+# one of the following features must be enabled.
+build = ["cmake"]
+system = []
+
 [dependencies]
 bitflags = "1.0"
 libc = "0.2"
 capstone="0.6.0"
 
 [build-dependencies]
-build-helper = "0.1"
+cmake = { version = "0.1", optional = true }
+pkg-config = "0.3"

bindings/rust/build.rs

@@ -1,20 +1,27 @@
-use std::{env, process::Command};
+#[cfg(feature = "build")]
+fn main() {
+    use std::env;
+    use std::path::PathBuf;
 
-use build_helper::rustc::{link_lib, link_search};
+    let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
+    let unicorn_dir = manifest_dir.parent().unwrap().parent().unwrap();
+    println!("cargo:rerun-if-changed={}", unicorn_dir.display());
 
-fn main() {
-    println!("cargo:rerun-if-changed=unicorn");
-    let out_dir = env::var("OUT_DIR").unwrap();
-    let unicorn = "libunicorn.a";
-    let _ = Command::new("cp")
-        .current_dir("../..")
-        .arg(&unicorn)
-        .arg(&out_dir)
-        .status()
-        .unwrap();
-    link_search(
-        Some(build_helper::SearchKind::Native),
-        build_helper::out_dir(),
+    let install_dir = cmake::Config::new(unicorn_dir)
+        .define("UNICORN_BUILD_SHARED", "OFF")
+        .build();
+    env::remove_var("PKG_CONFIG_PATH");
+    env::set_var(
+        "PKG_CONFIG_LIBDIR",
+        install_dir.join("lib").join("pkgconfig"),
     );
-    link_lib(Some(build_helper::LibKind::Static), "unicorn");
+    pkg_config::Config::new()
+        .statik(true)
+        .probe("unicorn")
+        .unwrap();
+}
+
+#[cfg(feature = "system")]
+fn main() {
+    pkg_config::probe_library("unicorn").unwrap();
 }