From d0a33baeca82494a7946ea2be7bd79568a8e5e3f Mon Sep 17 00:00:00 2001
From: Marco Farrugia <afmarco@gmail.com>
Date: Fri, 28 May 2021 01:51:34 -0400
Subject: [PATCH] fix for osx

---
 python/py_rust_library.bzl | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/python/py_rust_library.bzl b/python/py_rust_library.bzl
index 096084b861..931bcaa74c 100644
--- a/python/py_rust_library.bzl
+++ b/python/py_rust_library.bzl
@@ -19,9 +19,17 @@ def py_rust_library(name, **kwargs):
     rust_library(
         name = mangled,
         crate_type = "cdylib",
+        rustc_flags = select({
+            "@rules_rust//rust/platform:osx": [
+                "--codegen=link-arg=-undefined",
+                "--codegen=link-arg=dynamic_lookup",
+            ],
+            "//conditions:default": [],
+        }),
         **kwargs
     )
 
+    # TODO(windows): The extension should be .pyd
     renamed = name + ".so"
     native.genrule(
         name = name + "_rename",