Fixed building binary wheels against the limited ABI

Fixes #305.

docs/news.rst

@@ -1,6 +1,11 @@
 Release Notes
 =============
 
+**UNRELEASED**
+
+- Fixed regression from 0.33.5 that broke building binary wheels against the
+  limited ABI
+
 **0.33.5 (2019-08-17)**
 
 - Don't add the ``m`` ABI flag to wheel names on Python 3.8 (PR by rdb)

tests/test_bdist_wheel.py

@@ -1,4 +1,5 @@
 # coding: utf-8
+import os
 import subprocess
 import sys
 from zipfile import ZipFile
@@ -98,3 +99,14 @@ def test_build_number(dummy_dist, monkeypatch, tmpdir):
         filenames = set(wf.namelist())
         assert 'dummy_dist-1.0.dist-info/RECORD' in filenames
         assert 'dummy_dist-1.0.dist-info/METADATA' in filenames
+
+
+def test_limited_abi(monkeypatch, tmpdir):
+    """Test that building a binary wheel with the limited ABI works."""
+    this_dir = os.path.dirname(__file__)
+    source_dir = os.path.join(this_dir, 'testdata', 'extension.dist')
+    build_dir = tmpdir.join('build')
+    dist_dir = tmpdir.join('dist')
+    monkeypatch.chdir(source_dir)
+    subprocess.check_call([sys.executable, 'setup.py',  'bdist_wheel', '-b', str(build_dir),
+                           '-d', str(dist_dir)])

wheel/pep425tags.py

@@ -144,7 +144,7 @@ def get_supported(versions=None, supplied_platform=None):
     abi3s = set()
     for suffix in get_all_suffixes():
         if suffix.startswith('.abi'):
-            abi3s.add(suffix[0].split('.', 2)[1])
+            abi3s.add(suffix.split('.', 2)[1])
 
     abis.extend(sorted(list(abi3s)))