diff -Naur boost_1_50_0_beta1/boost/wave/cpplexer/cpplexer_exceptions.hpp boost_1_50_0_beta1_patch/boost/wave/cpplexer/cpplexer_exceptions.hpp
--- boost_1_50_0_beta1/boost/wave/cpplexer/cpplexer_exceptions.hpp	2012-05-26 20:17:03.000000000 +0530
+++ boost_1_50_0_beta1_patch/boost/wave/cpplexer/cpplexer_exceptions.hpp	2012-06-29 14:25:23.000000000 +0530
@@ -180,7 +180,7 @@
         level(severity_level(code)), code(code)
     {
         unsigned int off = 0;
-        while (off < sizeof(buffer) && *what_)
+        while (off < (sizeof(buffer)-1) && *what_)
             buffer[off++] = *what_++;
         buffer[off] = 0;
     }