--- a/gcc/fortran/io.c	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/fortran/io.c	Thu Oct 25 07:37:49 2018 +0900
@@ -1,5 +1,5 @@
 /* Deal with I/O statements & related stuff.
-   Copyright (C) 2000-2017 Free Software Foundation, Inc.
+   Copyright (C) 2000-2018 Free Software Foundation, Inc.
    Contributed by Andy Vaught
 
 This file is part of GCC.
@@ -25,6 +25,7 @@
 #include "gfortran.h"
 #include "match.h"
 #include "parse.h"
+#include "constructor.h"
 
 gfc_st_label
 format_asterisk = {0, NULL, NULL, -1, ST_LABEL_FORMAT, ST_LABEL_FORMAT, NULL,
@@ -985,6 +986,9 @@
 	case FMT_COMMA:
 	  goto format_item;
 
+	case FMT_COLON:
+	  goto format_item_1;
+
 	case FMT_LPAREN:
 
   dtio_vlist:
@@ -1603,7 +1607,7 @@
 /* Resolution of the FORMAT tag, to be called from resolve_tag.  */
 
 static bool
-resolve_tag_format (const gfc_expr *e)
+resolve_tag_format (gfc_expr *e)
 {
   if (e->expr_type == EXPR_CONSTANT
       && (e->ts.type != BT_CHARACTER
@@ -1614,6 +1618,47 @@
       return false;
     }
 
+  /* Concatenate a constant character array into a single character
+     expression.  */
+
+  if ((e->expr_type == EXPR_ARRAY || e->rank > 0)
+      && e->ts.type == BT_CHARACTER
+      && gfc_is_constant_expr (e))
+    {
+      if (e->expr_type == EXPR_VARIABLE
+	  && e->symtree->n.sym->attr.flavor == FL_PARAMETER)
+	gfc_simplify_expr (e, 1);
+
+      if (e->expr_type == EXPR_ARRAY)
+	{
+	  gfc_constructor *c;
+	  gfc_charlen_t n, len;
+	  gfc_expr *r;
+	  gfc_char_t *dest, *src;
+
+	  n = 0;
+	  c = gfc_constructor_first (e->value.constructor);
+	  len = c->expr->value.character.length;
+	  
+	  for ( ; c; c = gfc_constructor_next (c))
+	    n += len;
+
+	  r = gfc_get_character_expr (e->ts.kind, &e->where, NULL, n);
+	  dest = r->value.character.string;
+
+	  for (c = gfc_constructor_first (e->value.constructor);
+	     c; c = gfc_constructor_next (c))
+	    {
+	      src = c->expr->value.character.string;
+	      for (gfc_charlen_t i = 0 ; i < len; i++)
+		*dest++ = *src++;
+	    }
+
+	  gfc_replace_expr (e, r);
+	  return true;
+	}
+    }
+
   /* If e's rank is zero and e is not an element of an array, it should be
      of integer or character type.  The integer variable should be
      ASSIGNED.  */
@@ -4246,9 +4291,10 @@
 	goto syntax;
     }
 
-  /* See if we want to use defaults for missing exponents in real transfers.  */
+  /* See if we want to use defaults for missing exponents in real transfers
+     and other DEC runtime extensions.  */
   if (flag_dec)
-    dt->default_exp = 1;
+    dt->dec_ext = 1;
 
   /* A full IO statement has been matched.  Check the constraints.  spec_end is
      supplied for cases where no locus is supplied.  */