Merge pull request #84 from YannickJadoul/unbuffered-output

Applying unbuffered output to all platforms instead of only Windows

cibuildwheel/__main__.py

@@ -4,7 +4,7 @@ import argparse, os, subprocess, sys, textwrap
 import cibuildwheel
 import cibuildwheel.linux, cibuildwheel.windows, cibuildwheel.macos
 from cibuildwheel.environment import parse_environment, EnvironmentParseError
-from cibuildwheel.util import BuildSkipper
+from cibuildwheel.util import BuildSkipper, Unbuffered
 
 def get_option_from_environment(option_name, platform=None, default=None):
     '''
@@ -142,6 +142,9 @@ def main():
     elif platform == 'windows':
         pass
 
+    # Python is buffering by default when running on the CI platforms, giving problems interleaving subprocess call output with unflushed calls to 'print'
+    sys.stdout = Unbuffered(sys.stdout)
+
     print_preamble(platform, build_options)
 
     if not os.path.exists(output_dir):

cibuildwheel/windows.py

@@ -7,14 +7,10 @@ except ImportError:
 from collections import namedtuple
 from glob import glob
 
-from .util import prepare_command, get_build_verbosity_extra_flags, Unbuffered
+from .util import prepare_command, get_build_verbosity_extra_flags
 
 
 def build(project_dir, package_name, output_dir, test_command, test_requires, before_build, build_verbosity, skip, environment):
-    # 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 = 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')
     if not os.path.exists(run_with_env):