Merge commit 'upstream/1.2.0.d20100306'

1 files changed, 11 insertions, 1 deletions

diff --git a/engine/SCons/Builder.py b/engine/SCons/Builder.py
index fb41ae4..bf35b1e 100644
--- a/engine/SCons/Builder.py
+++ b/engine/SCons/Builder.py
@@ -98,7 +98,7 @@ There are the following methods for internal use within this module:
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #
 
-__revision__ = "src/engine/SCons/Builder.py 4629 2010/01/17 22:23:21 scons"
+__revision__ = "src/engine/SCons/Builder.py 4691 2010/03/06 16:22:36 bdbaddog"
 
 import UserDict
 import UserList
@@ -861,6 +861,16 @@ class CompositeBuilder(SCons.Util.Proxy):
         self.cmdgen.add_action(suffix, action)
         self.set_src_suffix(self.cmdgen.src_suffixes())
 
+def is_a_Builder(obj):
+    """"Returns True iff the specified obj is one of our Builder classes.
+
+    The test is complicated a bit by the fact that CompositeBuilder
+    is a proxy, not a subclass of BuilderBase.
+    """
+    return (isinstance(obj, BuilderBase)
+            or isinstance(obj, CompositeBuilder)
+            or callable(obj))
+
 # Local Variables:
 # tab-width:4
 # indent-tabs-mode:nil