re PR c++/27592 (dynamic cast failure)

2006-06-01  Andrew Pinski  <pinskia@physics.uc.edu>

        PR c++/27592
        * rtti.c (build_dynamic_cast_1): Call c_common_truthvalue_conversion
        on operand of the COND_EXPR for the null pointer check.

From-SVN: r114361

gcc/cp/ChangeLog

 2006-06-01  Andrew Pinski  <pinskia@physics.uc.edu>
 
+	PR c++/27592
+	* rtti.c (build_dynamic_cast_1): Call c_common_truthvalue_conversion
+	on operand of the COND_EXPR for the null pointer check.
+
+2006-06-01  Andrew Pinski  <pinskia@physics.uc.edu>
+
 	PR c++/26740
 	* typeck.c (build_unary_op): Mark the function as being used.
 

gcc/cp/rtti.c

@@ -677,9 +677,11 @@ build_dynamic_cast_1 (tree type, tree expr)
 	  if (tc == REFERENCE_TYPE)
 	    {
 	      tree bad = throw_bad_cast ();
+	      tree neq;
 
 	      result = save_expr (result);
-	      return build3 (COND_EXPR, type, result, result, bad);
+	      neq = c_common_truthvalue_conversion (result);
+	      return build3 (COND_EXPR, type, neq, result, bad);
 	    }
 
 	  /* Now back to the type we want from a void*.  */