Add proper package configuration for iree.jax Python package. (#6214)

* Will set it up to build in releases in a followup.
diff --git a/bindings/python/CMakeLists.txt b/bindings/python/CMakeLists.txt
index f7b489c..b80db7b 100644
--- a/bindings/python/CMakeLists.txt
+++ b/bindings/python/CMakeLists.txt
@@ -11,15 +11,12 @@
 
 # Namespace packages.
 add_subdirectory(iree/runtime)
+add_subdirectory(iree/jax)
 
 if(${IREE_BUILD_COMPILER})
 add_subdirectory(iree/compiler)
 add_subdirectory(iree/tools/core)
 endif()
 
-if(${IREE_BUILD_XLA_COMPILER})
-add_subdirectory(iree/jax)
-endif()
-
 # Tests.
 add_subdirectory(tests)
diff --git a/bindings/python/iree/jax/CMakeLists.txt b/bindings/python/iree/jax/CMakeLists.txt
index e140f4a..08bd99a 100644
--- a/bindings/python/iree/jax/CMakeLists.txt
+++ b/bindings/python/iree/jax/CMakeLists.txt
@@ -12,9 +12,20 @@
     "frontend.py"
 )
 
+# Only enable the tests if the XLA compiler is built.
+if(${IREE_BUILD_XLA_COMPILER})
 iree_py_test(
   NAME
     frontend_test
   SRCS
     "frontend_test.py"
 )
+endif()
+
+iree_py_install_package(
+  COMPONENT IreePythonPackage-jax
+  PACKAGE_NAME iree_jax
+  MODULE_PATH iree/jax
+  ADDL_PACKAGE_FILES
+    ${CMAKE_CURRENT_SOURCE_DIR}/README.md
+)
diff --git a/bindings/python/iree/jax/setup.py.in b/bindings/python/iree/jax/setup.py.in
new file mode 100644
index 0000000..59ad912
--- /dev/null
+++ b/bindings/python/iree/jax/setup.py.in
@@ -0,0 +1,45 @@
+#!/usr/bin/python3
+
+# Copyright 2021 The IREE Authors
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+from distutils.command.install import install
+import os
+import platform
+from setuptools import setup, find_namespace_packages
+
+with open(os.path.join(os.path.dirname(__file__), "README.md"), "r") as f:
+  README = f.read()
+
+exe_suffix = ".exe" if platform.system() == "Windows" else ""
+
+setup(
+    name="iree-jax@IREE_RELEASE_PACKAGE_SUFFIX@",
+    version="@IREE_RELEASE_VERSION@",
+    author="The IREE Team",
+    author_email="iree-discuss@googlegroups.com",
+    license="Apache",
+    description="IREE JAX API",
+    long_description=README,
+    long_description_content_type="text/markdown",
+    url="https://github.com/google/iree",
+    classifiers=[
+        "Programming Language :: Python :: 3",
+        "License :: OSI Approved :: Apache License",
+        "Operating System :: OS Independent",
+        "Development Status :: 3 - Alpha",
+    ],
+    python_requires=">=3.6",
+    packages=find_namespace_packages(include=["iree.jax"]),
+    zip_safe=True,
+    install_requires = [
+      "jax",
+      "jaxlib",
+      "iree-compiler@IREE_RELEASE_PACKAGE_SUFFIX@==@IREE_RELEASE_VERSION@",
+      "iree-runtime@IREE_RELEASE_PACKAGE_SUFFIX@==@IREE_RELEASE_VERSION@",
+      "iree-tools-xla@IREE_RELEASE_PACKAGE_SUFFIX@==@IREE_RELEASE_VERSION@",
+    ],
+)
diff --git a/bindings/python/iree/jax/version.py.in b/bindings/python/iree/jax/version.py.in
new file mode 100644
index 0000000..ed72ac3
--- /dev/null
+++ b/bindings/python/iree/jax/version.py.in
@@ -0,0 +1,9 @@
+# Copyright 2021 The IREE Authors
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+PACKAGE_SUFFIX = "@IREE_RELEASE_PACKAGE_SUFFIX@"
+VERSION = "@IREE_RELEASE_VERSION@"
+REVISION = "@IREE_RELEASE_REVISION@"
diff --git a/build_tools/cmake/iree_python.cmake b/build_tools/cmake/iree_python.cmake
index b5a825c..355f5a3 100644
--- a/build_tools/cmake/iree_python.cmake
+++ b/build_tools/cmake/iree_python.cmake
@@ -38,7 +38,7 @@
   cmake_parse_arguments(ARG
     "AUGMENT_EXISTING_PACKAGE"
     "COMPONENT;PACKAGE_NAME;MODULE_PATH"
-    "DEPS"
+    "DEPS;ADDL_PACKAGE_FILES"
     ${ARGN})
   set(_install_component ${ARG_COMPONENT})
   set(_install_packages_dir "${CMAKE_INSTALL_PREFIX}/python_packages/${ARG_PACKAGE_NAME}")
@@ -50,6 +50,7 @@
     install(
       FILES
         ${CMAKE_CURRENT_BINARY_DIR}/setup.py
+        ${ARG_ADDL_PACKAGE_FILES}
       COMPONENT ${_install_component}
       DESTINATION "${_install_packages_dir}"
     )