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import sys
from distutils.errors import (CCompilerError, DistutilsExecError,
DistutilsPlatformError)
try:
from setuptools.command.build_ext import build_ext
except ImportError:
from distutils.command.build_ext import build_ext
class optional_build_ext(build_ext):
"""This class subclasses build_ext and allows
the building of C extensions to fail.
"""
def run(self):
try:
build_ext.run(self)
except DistutilsPlatformError, e:
self._unavailable(e)
def build_extension(self, ext):
try:
build_ext.build_extension(self, ext)
except (CCompilerError, DistutilsExecError), e:
self._unavailable(e)
def _unavailable(self, e):
print >> sys.stderr, '*' * 80
print >> sys.stderr, """WARNING:
An optional code optimization (C extension) could not be compiled.
Optimizations for this package will not be available!"""
print >> sys.stderr
print >> sys.stderr, e
print >> sys.stderr, '*' * 80
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