From 165db545ef44004c6a3913316a8c601fd1646a15 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Mon, 20 Oct 2014 08:23:18 +0200
Subject: [PATCH] Closes #1602: allow overriding lambda values with strings

---
 sphinx/config.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sphinx/config.py b/sphinx/config.py
index de8af7c1c..cf6bed087 100644
--- a/sphinx/config.py
+++ b/sphinx/config.py
@@ -284,9 +284,11 @@ class Config(object):
                     except ValueError:
                         warn('invalid number %r for config value %r, ignoring'
                              % (value, valname))
+                elif hasattr(defvalue, '__call__'):
+                    config[valname] = value
                 elif defvalue is not None and not isinstance(defvalue, string_types):
-                    warn('cannot override config setting %r with unsupported type, '
-                         'ignoring' % valname)
+                    warn('cannot override config setting %r with unsupported '
+                         'type, ignoring' % valname)
                 else:
                     config[valname] = value
             else: