2015-02-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++-v3/64367
	* include/std/stdexcept (std::__sso_string::_M_bytes): Use
	sizeof(__str) instead of sizeof(_M_s).

--- libstdc++-v3/include/std/stdexcept
+++ libstdc++-v3/include/std/stdexcept
@@ -80,7 +80,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
     union {
       __str _M_s;
-      char _M_bytes[sizeof(_M_s)];
+      char _M_bytes[sizeof(__str)];
     };
 
     __sso_string() _GLIBCXX_USE_NOEXCEPT;