Fix support for namespace packages

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+ - Fix support for namespace packages. [#79](https://github.com/PyO3/setuptools-rust/pull/79)
+
 ## 0.11.1 (2020-08-07)
 
  - Fix building for 32-bit Python on 64-bit Windows. [#77](https://github.com/PyO3/setuptools-rust/pull/77)

examples/namespace_package/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "namespace_package_bar"
+version = "0.1.0"
+edition = "2018"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies.pyo3]
+version = "0.11.1"
+features = ["extension-module"]

examples/namespace_package/namespace_package/python/__init__.py

@@ -0,0 +1,2 @@
+def python_func():
+    return 15

examples/namespace_package/pyproject.toml

@@ -0,0 +1,2 @@
+[build-system]
+requires = ["setuptools", "wheel", "setuptools-rust", "cffi"]

examples/namespace_package/setup.py

@@ -0,0 +1,11 @@
+from setuptools import setup, find_namespace_packages
+from setuptools_rust import Binding, RustExtension
+
+
+setup(
+    name='namespace_package',
+    version="0.1.0",
+    packages=find_namespace_packages(include=['namespace_package.*']),
+    zip_safe=False,
+    rust_extensions=[RustExtension("namespace_package.bar", path="Cargo.toml", binding=Binding.PyO3, debug=False)],
+)

examples/namespace_package/src/lib.rs

@@ -0,0 +1,15 @@
+use pyo3::prelude::*;
+use pyo3::wrap_pyfunction;
+
+#[pyfunction]
+fn rust_func() -> usize {
+    14
+}
+
+/// A Python module implemented in Rust.
+#[pymodule]
+fn rust(py: Python, m: &PyModule) -> PyResult<()> {
+    m.add_wrapped(wrap_pyfunction!(rust_func))?;
+
+    Ok(())
+}

examples/namespace_package/tests.py

@@ -0,0 +1,9 @@
+from namespace_package import rust, python
+
+
+def test_rust():
+	assert rust.rust_func() == 14
+
+
+def test_cffi():
+	assert python.python_func() == 15

setuptools_rust/setuptools_ext.py

@@ -1,8 +1,7 @@
 from distutils import log
 from distutils.command.check import check
 from distutils.command.clean import clean
-from distutils.command.install import install
-
+from setuptools.command.install import install
 from setuptools.command.build_ext import build_ext
 
 try: