diff -ru boost.orig/boost/libs/locale/src/encoding/codepage.cpp boost/boost/libs/locale/src/encoding/codepage.cpp
--- foo/misc/boost.orig/libs/locale/src/encoding/codepage.cpp
+++ foo/misc/boost/libs/locale/src/encoding/codepage.cpp
@@ -58,6 +58,9 @@
                         return cvt->convert(begin,end);
                     #endif
                     #endif
+		    // ensures we get a sensible warning in boost's gettext results about a real mismatch.
+		    if (to_charset && from_charset && !strcmp(to_charset, from_charset))
+			    return std::string(begin, end - begin);
                     throw invalid_charset_error(std::string(to_charset) + " or " + from_charset);
                 }