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import os
import sys
from distutils.errors import (CCompilerError, DistutilsExecError,
DistutilsPlatformError)
try:
from setuptools.command.build_ext import build_ext
from pkg_resources import (normalize_path, working_set,
add_activation_listener, require)
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 as e:
self._unavailable(e)
def build_extension(self, ext):
try:
build_ext.build_extension(self, ext)
except (CCompilerError, DistutilsExecError) as e:
self._unavailable(e)
def _unavailable(self, e):
print('*' * 80, file=sys.stderr)
print("""WARNING:
An optional code optimization (C extension) could not be compiled.
Optimizations for this package will not be available!""", file=sys.stderr)
print(file=sys.stderr)
print(e, file=sys.stderr)
print('*' * 80, file=sys.stderr)
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