Make compilation of C extension optional.

1 files changed, 36 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index d8e1ee7..02fa86f 100644
--- a/setup.py
+++ b/setup.py
@@ -17,12 +17,46 @@ $Id$
 """
 
 import os
+import sys
 
 from setuptools import setup, find_packages, Extension
+from distutils.command.build_ext import build_ext
+from distutils.errors import CCompilerError
+from distutils.errors import DistutilsExecError
+from distutils.errors import DistutilsPlatformError
 
 def read(*rnames):
     return open(os.path.join(os.path.dirname(__file__), *rnames)).read()
 
+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
+
 
 setup(name='zope.i18nmessageid',
     version = '3.5.0dev',
@@ -61,4 +95,6 @@ setup(name='zope.i18nmessageid',
     install_requires=['setuptools'],
     include_package_data = True,
     zip_safe = False,
+    cmdclass = {'build_ext':optional_build_ext},
     )
+