Diff between brotlipy 0.7.0 tag and the source for building the abi3 compatible wheels

brotlipy-0.7.0-abi3.diff

diff --git a/setup.py b/setup.py
index f804932..12ae724 100644
--- a/setup.py
+++ b/setup.py
@@ -1,11 +1,43 @@
 #!/usr/bin/env python
+import platform
+import sys
 from setuptools import find_packages, setup
+from setuptools.command.build_ext import build_ext
 
 long_description = (
     open("README.rst").read() + '\n\n' + open("HISTORY.rst").read()
 )
 
 
+class BuildClibBeforeExt(build_ext):
+    """ Setuptools `develop` command (used by `pip install -e .`) only calls
+    `build_ext`, unlike `install` which calls `build` and all its related
+    sub-commands. Linking the CFFI extension with the libbrotli static library
+    fails since the `build_clib` command is not called in the former case.
+    This custom `build_ext` class ensures that `build_clib` command is run
+    before the CFFI extension module is compiled.
+    https://github.com/pypa/pip/issues/4523
+    """
+
+    def run(self):
+        self.run_command("build_clib")
+        build_ext.run(self)
+
+
+cmdclass = {'build_ext': BuildClibBeforeExt}
+if sys.version_info > (3,) and platform.python_implementation() == "CPython":
+    try:
+        import wheel.bdist_wheel
+    except ImportError:
+        pass
+    else:
+        class BDistWheel(wheel.bdist_wheel.bdist_wheel):
+            def finalize_options(self):
+                self.py_limited_api = "cp3{}".format(sys.version_info[1])
+                wheel.bdist_wheel.bdist_wheel.finalize_options(self)
+        cmdclass['bdist_wheel'] = BDistWheel
+
+
 setup(
     name="brotlipy",
     version="0.7.0",
@@ -27,6 +59,7 @@ setup(
     extras_require={
         ':python_version == "2.7" or python_version == "3.3"': ['enum34>=1.0.4, <2'],
     },
+    cmdclass=cmdclass,
 
     cffi_modules=["src/brotli/build.py:ffi"],
 
@@ -70,7 +103,6 @@ setup(
     ],
 
     zip_safe=False,

     classifiers=[
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",