1 files changed, 55 insertions, 0 deletions
diff --git a/gcc/fortran/frontend-passes.c b/gcc/fortran/frontend-passes.c
index 44d2a42..82812f8 100644
--- a/gcc/fortran/frontend-passes.c
+++ b/gcc/fortran/frontend-passes.c
@@ -48,6 +48,10 @@ static gfc_code * create_do_loop (gfc_expr *, gfc_expr *, gfc_expr *,
 				  locus *, gfc_namespace *,
 				  char *vname=NULL);
 
+#ifdef CHECKING_P
+static void check_locus (gfc_namespace *);
+#endif
+
 /* How deep we are inside an argument list.  */
 
 static int count_arglist;
@@ -127,6 +131,10 @@ gfc_run_passes (gfc_namespace *ns)
   doloop_list.release ();
   int w, e;
 
+#ifdef CHECKING_P
+  check_locus (ns);
+#endif
+
   if (flag_frontend_optimize)
     {
       optimize_namespace (ns);
@@ -145,6 +153,53 @@ gfc_run_passes (gfc_namespace *ns)
     realloc_strings (ns);
 }
 
+#ifdef CHECKING_P
+
+/* Callback function: Warn if there is no location information in a
+   statement.  */
+
+static int
+check_locus_code (gfc_code **c, int *walk_subtrees ATTRIBUTE_UNUSED,
+		  void *data ATTRIBUTE_UNUSED)
+{
+  current_code = c;
+  if (c && *c && (((*c)->loc.nextc == NULL) || ((*c)->loc.lb == NULL)))
+    gfc_warning_internal (0, "No location in statement");
+
+  return 0;
+}
+
+
+/* Callback function: Warn if there is no location information in an
+   expression.  */
+
+static int
+check_locus_expr (gfc_expr **e, int *walk_subtrees ATTRIBUTE_UNUSED,
+		  void *data ATTRIBUTE_UNUSED)
+{
+
+  if (e && *e && (((*e)->where.nextc == NULL || (*e)->where.lb == NULL)))
+    gfc_warning_internal (0, "No location in expression near %L",
+			  &((*current_code)->loc));
+  return 0;
+}
+
+/* Run check for missing location information.  */
+
+static void
+check_locus (gfc_namespace *ns)
+{
+  gfc_code_walker (&ns->code, check_locus_code, check_locus_expr, NULL);
+
+  for (ns = ns->contained; ns; ns = ns->sibling)
+    {
+      if (ns->code == NULL || ns->code->op != EXEC_BLOCK)
+	check_locus (ns);
+    }
+}
+
+#endif
+
 /* Callback for each gfc_code node invoked from check_realloc_strings.
    For an allocatable LHS string which also appears as a variable on
    the RHS, replace