+2011-10-14 Jonathan Yong <jon_y@users.sourceforge.net>
+
+ * configure.host: Use config/os/mingw32-w64 instead of
+ config/os/mingw32 if vendor key is "w64".
+ * config/os/mingw32-w64: Duplicate from config/os/mingw32.
+ * config/os/mingw32-w64/os_defines.h: Enable
+ _GLIBCXX_FULLY_DYNAMIC_STRING if undefined.
+ * acinclude.m4: Set fully-dynamic-string to 1 when enabled,
+ 0 when disabled or undefined if unset by user.
+ * include/bits/basic_string.h: Check if
+ _GLIBCXX_FULLY_DYNAMIC_STRING is set to 0 instead of undefined.
+ include/bits/basic_string.tcc: Likewise.
+ * configure: Regenerated.
+ * config.h.in: Likewise.
+
2011-10-13 Paolo Carlini <paolo.carlini@oracle.com>
PR libstdc++/50714