commit e2ef67354b8e81d48adcdb9eea975d0f0408b0a8
Author: tim <timshen91@gmail.com>
Date:   Tue Oct 15 10:40:01 2013 -0400

    2013-10-15  Tim Shen  <timshen91@gmail.com>
    
    	PR libstdc++/58737
    	* include/bits/regex_automaton.h (_Automaton<>::~_Automaton): Fix memory
    	leak by adding it.
    	* include/bits/regex_executor.h (_Executor<>::~_Executor): Likewise.

diff --git a/libstdc++-v3/include/bits/regex_automaton.h b/libstdc++-v3/include/bits/regex_automaton.h
index 60744b2..35cfc1b 100644
--- a/libstdc++-v3/include/bits/regex_automaton.h
+++ b/libstdc++-v3/include/bits/regex_automaton.h
@@ -112,6 +112,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       typedef size_t _SizeT;
 
     public:
+      virtual
+      ~_Automaton()
+      { }
+
       virtual _SizeT
       _M_sub_count() const = 0;
 
diff --git a/libstdc++-v3/include/bits/regex_executor.h b/libstdc++-v3/include/bits/regex_executor.h
index 4626437..23b5d01 100644
--- a/libstdc++-v3/include/bits/regex_executor.h
+++ b/libstdc++-v3/include/bits/regex_executor.h
@@ -83,6 +83,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 	       : __flags)
       { }
 
+      virtual
+      ~_Executor()
+      { }
+
       // Set matched when string exactly match the pattern.
       bool
       _M_match()