Make dtors noexcept(false) when compiling in C++11 and above. This avoids
silent breakage due to the semantic changes between C++98 and C++11.
See also: https://bugs.gentoo.org/show_bug.cgi?id=595424

--- a/include/log4cplus/hierarchylocker.h
+++ b/include/log4cplus/hierarchylocker.h
@@ -48,7 +48,11 @@
     public:
       // ctor & dtor
         HierarchyLocker(Hierarchy& h);
-        ~HierarchyLocker();
+        ~HierarchyLocker()
+#if __cplusplus >= 201103L
+        noexcept(false)
+#endif
+        ;
         
         /**
          * Calls the <code>resetConfiguration()</code> method on the locked Hierarchy.
--- a/src/hierarchylocker.cxx
+++ b/src/hierarchylocker.cxx
@@ -62,6 +62,9 @@
  
 
 HierarchyLocker::~HierarchyLocker()
+#if __cplusplus >= 201103L
+    noexcept(false)
+#endif
 {
     try {
         for(LoggerList::iterator it=loggerList.begin(); it!=loggerList.end(); ++it) {