add optional cmake builds

build.rs

@@ -1,6 +1,7 @@
 const LIB_ATOMIC_OPS_DIR: &str = "vendor/libatomic_ops";
 const LIB_GC_DIR: &str = "vendor/bdwgc";
 
+#[cfg(feature = "autotools")]
 fn main() {
     for dir in &[LIB_ATOMIC_OPS_DIR, LIB_GC_DIR] {
         std::process::Command::new("sh")
@@ -41,3 +42,29 @@ fn main() {
             .unwrap();
     }
 }
+
+#[cfg(feature = "cmake")]
+fn main() {
+    use cmake::Config;
+    use std::path::Path;
+
+    let libatomic_include_path = Path::new(LIB_ATOMIC_OPS_DIR)
+        .join("src")
+        .canonicalize()
+        .unwrap()
+        .display()
+        .to_string()
+        .replace(r"\\?\", "");
+
+    let dst = Config::new(LIB_GC_DIR)
+        .profile("Release")
+        .define("BUILD_SHARED_LIBS", "FALSE")
+        .cflag(format!("-I{}", libatomic_include_path))
+        .build();
+
+    println!(
+        "cargo:rustc-link-search=native={}",
+        dst.join("lib").display()
+    );
+    println!("cargo:rustc-link-lib=static=gc");
+}