solve macos compilation problem (#43)

Author: chenhuaiyuan

phper/build.rs

@@ -12,6 +12,13 @@ use phper_sys::*;
 
 fn main() {
     phper_build::register_configures();
+
+    #[cfg(target_os = "macos")]
+    {
+        println!("cargo:rustc-cdylib-link-arg=-undefined");
+        println!("cargo:rustc-cdylib-link-arg=dynamic_lookup");
+    }
+
     assert_eq!(
         USING_ZTS, 0,
         "PHPER not support ZTS mode now (php built with `--enable-maintainer-zts` or \