Merge commit '92304597bd06531c0139db9dd8766562f38cf19e' into python3-ci

* commit '92304597bd06531c0139db9dd8766562f38cf19e':
  Replacing unbuffered 'os.fdopen' by proxy object to have a unbuffered stdout solution for Windows and AppVeyor that works on Python 3

cibuildwheel/util.py

@@ -22,3 +22,20 @@ class BuildSkipper(object):
 
     def __repr__(self):
         return 'BuildSkipper(%r)' % ' '.join(self.patterns)
+
+
+# Taken from https://stackoverflow.com/a/107717
+class Unbuffered(object):
+    def __init__(self, stream):
+        self.stream = stream
+
+    def write(self, data):
+        self.stream.write(data)
+        self.stream.flush()
+
+    def writelines(self, datas):
+        self.stream.writelines(datas)
+        self.stream.flush()
+
+    def __getattr__(self, attr):
+        return getattr(self.stream, attr)

cibuildwheel/windows.py

@@ -7,13 +7,13 @@ except ImportError:
 from collections import namedtuple
 from glob import glob
 
-from .util import prepare_command
+from .util import prepare_command, Unbuffered
 
 
 def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, skip):
     # Python under AppVeyor/Windows seems to be buffering by default, giving problems interleaving subprocess call output with unflushed calls to 'print'
     sys.stdout.flush()
-    sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 0)
+    sys.stdout = Unbuffered(sys.stdout)
 
     # run_with_env is a cmd file that sets the right environment variables to
     run_with_env = os.path.join(tempfile.gettempdir(), 'appveyor_run_with_env.cmd')