Added an execution layer to be able to customize per-extension

building.

command/build_ext.py

@@ -356,13 +356,16 @@ class build_ext (Command):
 
     # get_outputs ()
 
-
-    def build_extensions (self):
+    def build_extensions(self):
 
         # First, sanity-check the 'extensions' list
         self.check_extensions_list(self.extensions)
 
         for ext in self.extensions:
+            self.build_extension(ext)
+
+    def build_extension(self, ext):
+
         sources = ext.sources
         if sources is None or type(sources) not in (ListType, TupleType):
             raise DistutilsSetupError, \
@@ -391,7 +394,7 @@ class build_ext (Command):
         if not (self.force or newer_group(sources, ext_filename, 'newer')):
             self.announce("skipping '%s' extension (up-to-date)" %
                           ext.name)
-                continue # 'for' loop over all extensions
+            return
         else:
             self.announce("building '%s' extension" % ext.name)
 
@@ -453,8 +456,6 @@ class build_ext (Command):
             debug=self.debug,
             build_temp=self.build_temp)
 
-    # build_extensions ()
-
 
     def swig_sources (self, sources):