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Make the C extension optional.

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1 parent 0ca7fa0 commit 4ec9831f54c7d907e62ea00ee3922efec9fb9a78 @bdarnell bdarnell committed Nov 5, 2013
Showing with 85 additions and 0 deletions.
  1. +85 −0 setup.py
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@@ -16,6 +16,7 @@
import platform
import sys
+import warnings
try:
# Use setuptools if available, for install_requires (among other things).
@@ -27,6 +28,89 @@
from distutils.core import Extension
+# The following code is copied from
+# https://github.com/mongodb/mongo-python-driver/blob/master/setup.py
+# to support installing without the extension on platforms where
+# no compiler is available.
+from distutils.command.build_ext import build_ext
+from distutils.errors import CCompilerError
+from distutils.errors import DistutilsPlatformError, DistutilsExecError
+if sys.platform == 'win32' and sys.version_info > (2, 6):
+ # 2.6's distutils.msvc9compiler can raise an IOError when failing to
+ # find the compiler
+ build_errors = (CCompilerError, DistutilsExecError,
+ DistutilsPlatformError, IOError)
+else:
+ build_errors = (CCompilerError, DistutilsExecError, DistutilsPlatformError)
+
+class custom_build_ext(build_ext):
+ """Allow C extension building to fail.
+
+ The C extension speeds up websocket masking, but is not essential.
+ """
+
+ warning_message = """
+********************************************************************
+WARNING: %s could not
+be compiled. No C extensions are essential for Tornado to run,
+although they do result in significant speed improvements for
+websockets.
+%s
+
+Here are some hints for popular operating systems:
+
+If you are seeing this message on Linux you probably need to
+install GCC and/or the Python development package for your
+version of Python.
+
+Debian and Ubuntu users should issue the following command:
+
+ $ sudo apt-get install build-essential python-dev
+
+RedHat, CentOS, and Fedora users should issue the following command:
+
+ $ sudo yum install gcc python-devel
+
+If you are seeing this message on OSX please read the documentation
+here:
+
+http://api.mongodb.org/python/current/installation.html#osx
+********************************************************************
+"""
+
+ def run(self):
+ try:
+ build_ext.run(self)
+ except DistutilsPlatformError:
+ e = sys.exc_info()[1]
+ sys.stdout.write('%s\n' % str(e))
+ warnings.warn(self.warning_message % ("Extension modules",
+ "There was an issue with "
+ "your platform configuration"
+ " - see above."))
+
+ def build_extension(self, ext):
+ name = ext.name
+ if sys.version_info[:3] >= (2, 4, 0):
+ try:
+ build_ext.build_extension(self, ext)
+ except build_errors:
+ e = sys.exc_info()[1]
+ sys.stdout.write('%s\n' % str(e))
+ warnings.warn(self.warning_message % ("The %s extension "
+ "module" % (name,),
+ "The output above "
+ "this warning shows how "
+ "the compilation "
+ "failed."))
+ else:
+ warnings.warn(self.warning_message % ("The %s extension "
+ "module" % (name,),
+ "Please use Python >= 2.4 "
+ "to take advantage of the "
+ "extension."))
+
+
kwargs = {}
version = "3.2.dev2"
@@ -85,5 +169,6 @@
'Programming Language :: Python :: Implementation :: CPython',
'Programming Language :: Python :: Implementation :: PyPy',
],
+ cmdclass={"build_ext": custom_build_ext},
**kwargs
)

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