Make string and char pointers comparable

gcc/elna-diagnostic.cc

@@ -1,3 +1,20 @@
+/* elna-diagnostic.cc -- Elna frontend specific diagnostic routines.
+   Copyright (C) 2025 Free Software Foundation, Inc.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
 #include "elna/gcc/elna-diagnostic.h"
 #include "elna/gcc/elna-tree.h"
 
@@ -12,7 +29,7 @@ namespace gcc
         return linemap_position_for_column(line_table, position->column);
     }
 
-    const char *print_type(tree type)
+    std::string print_type(tree type)
     {
         gcc_assert(TYPE_P(type));
 
@@ -38,7 +55,7 @@ namespace gcc
         }
         else if (is_pointer_type(type))
         {
-            return "pointer";
+            return std::string("\"pointer to " + print_type(TREE_TYPE(type)) + "\"");
         }
         else if (TREE_CODE(type) == ARRAY_TYPE)
         {