weird warning turns out to be GCC 4.7.2 Bug 56402

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56402

The lambda definition captures the this pointer,
but the ctor of the lamda does not initialise this capture.

In our case, we're lucky, as we don't use the "this" pointer;
otherwise, we'd get a crash a runtime.

Fixed since GCC-4.7.3  --> it's *really* time to upgrade to Debian/Jessie

src/lib/diff/record.hpp

@@ -322,7 +322,7 @@ namespace diff{
                                    {
                                      return key == extractKey(elm); 
                                    });
-        }
+        }                     ///////////////////TODO this lambda triggers a GCC-4.7.2 Bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56402
       
       
       friend bool