diff --git a/gdb/linespec.c b/gdb/linespec.c
index 96f1d07..9468f26 100644
--- a/gdb/linespec.c
+++ b/gdb/linespec.c
@@ -278,7 +278,7 @@ struct ls_parser
   struct
   {
     /* Save head of input stream.  */
-    char *saved_arg;
+    const char *saved_arg;
 
     /* Head of the input stream.  */
     const char **stream;
@@ -320,7 +320,7 @@ static CORE_ADDR linespec_expression_to_pc (const char **exp_ptr);
 
 static struct symtabs_and_lines decode_objc (struct linespec_state *self,
 					     linespec_p ls,
-					     char **argptr);
+					     const char **argptr);
 
 static VEC (symtab_ptr) *symtabs_from_filename (const char *);
 
@@ -2144,7 +2144,7 @@ convert_linespec_to_sals (struct linespec_state *state, linespec_p ls)
 /* Parse the linespec in ARGPTR.  */
 
 static struct symtabs_and_lines
-parse_linespec (linespec_parser *parser, char **argptr)
+parse_linespec (linespec_parser *parser, const char **argptr)
 {
   linespec_token token;
   struct symtabs_and_lines values;
@@ -2175,7 +2175,7 @@ parse_linespec (linespec_parser *parser, char **argptr)
   parser->keyword_ok = 0;
 
   parser->lexer.saved_arg = *argptr;
-  parser->lexer.stream = (const char **) argptr;
+  parser->lexer.stream = argptr;
   file_exception.reason = 0;
 
   /* Initialize the default symtab and line offset.  */
@@ -2426,6 +2426,7 @@ decode_line_full (char **argptr, int flags,
   VEC (const_char_ptr) *filters = NULL;
   linespec_parser parser;
   struct linespec_state *state;
+  const char *copy, *orig;
 
   gdb_assert (canonical != NULL);
   /* The filter only makes sense for 'all'.  */
@@ -2441,7 +2442,9 @@ decode_line_full (char **argptr, int flags,
   cleanups = make_cleanup (linespec_parser_delete, &parser);
   save_current_program_space ();
 
-  result = parse_linespec (&parser, argptr);
+  orig = copy = *argptr;
+  result = parse_linespec (&parser, &copy);
+  *argptr += copy - orig;
   state = PARSER_STATE (&parser);
 
   gdb_assert (result.nelts == 1 || canonical->pre_expanded);
@@ -2496,13 +2499,16 @@ decode_line_1 (char **argptr, int flags,
   struct symtabs_and_lines result;
   linespec_parser parser;
   struct cleanup *cleanups;
+  const char *copy, *orig;
 
   linespec_parser_new (&parser, flags, current_language, default_symtab,
 		       default_line, NULL);
   cleanups = make_cleanup (linespec_parser_delete, &parser);
   save_current_program_space ();
 
-  result = parse_linespec (&parser, argptr);
+  orig = copy = *argptr;
+  result = parse_linespec (&parser, &copy);
+  *argptr += copy - orig;
 
   do_cleanups (cleanups);
   return result;
@@ -2602,12 +2608,12 @@ linespec_expression_to_pc (const char **exp_ptr)
    the existing C++ code to let the user choose one.  */
 
 static struct symtabs_and_lines
-decode_objc (struct linespec_state *self, linespec_p ls, char **argptr)
+decode_objc (struct linespec_state *self, linespec_p ls, const char **argptr)
 {
   struct collect_info info;
   VEC (const_char_ptr) *symbol_names = NULL;
   struct symtabs_and_lines values;
-  char *new_argptr;
+  const char *new_argptr;
   struct cleanup *cleanup = make_cleanup (VEC_cleanup (const_char_ptr),
 					  &symbol_names);
 
@@ -3053,7 +3059,7 @@ find_function_symbols (struct linespec_state *state,
   info.file_symtabs = file_symtabs;
 
   /* Try NAME as an Objective-C selector.  */
-  find_imps ((char *) name, &symbol_names);
+  find_imps (name, &symbol_names);
   if (!VEC_empty (const_char_ptr, symbol_names))
     add_all_symbol_names_from_pspace (&info, NULL, symbol_names);
   else
diff --git a/gdb/objc-lang.c b/gdb/objc-lang.c
index cf99a0f..bcce435 100644
--- a/gdb/objc-lang.c
+++ b/gdb/objc-lang.c
@@ -1072,7 +1072,7 @@ uniquify_strings (VEC (const_char_ptr) **strings)
 }
 
 /* 
- * Function: find_imps (char *selector, struct symbol **sym_arr)
+ * Function: find_imps (const char *selector, struct symbol **sym_arr)
  *
  * Input:  a string representing a selector
  *         a pointer to an array of symbol pointers
@@ -1101,8 +1101,8 @@ uniquify_strings (VEC (const_char_ptr) **strings)
  *       be the index of the first non-debuggable one).
  */
 
-char *
-find_imps (char *method, VEC (const_char_ptr) **symbol_names)
+const char *
+find_imps (const char *method, VEC (const_char_ptr) **symbol_names)
 {
   char type = '\0';
   char *class = NULL;
diff --git a/gdb/objc-lang.h b/gdb/objc-lang.h
index 23fac1b..2409363 100644
--- a/gdb/objc-lang.h
+++ b/gdb/objc-lang.h
@@ -36,7 +36,8 @@ extern char *objc_demangle (const char *mangled, int options);
 
 extern int find_objc_msgcall (CORE_ADDR pc, CORE_ADDR *new_pc);
 
-extern char *find_imps (char *method, VEC (const_char_ptr) **symbol_names);
+extern const char *
+  find_imps (const char *method, VEC (const_char_ptr) **symbol_names);
 
 extern struct value *value_nsstring (struct gdbarch *gdbarch,
 				     char *ptr, int len);