From f527b8233498b40c8a2c616b82265f2e58aba42a Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Sun, 18 Jul 2021 21:35:53 +0200
Subject: Fortran: reject FORMAT tag of unknown type.

gcc/fortran/ChangeLog:

	PR fortran/101084
	* io.c (resolve_tag_format): Extend FORMAT check to unknown type.

gcc/testsuite/ChangeLog:

	PR fortran/101084
	* gfortran.dg/fmt_nonchar_3.f90: New test.
---
 gcc/fortran/io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'gcc/fortran/io.c')

diff --git a/gcc/fortran/io.c b/gcc/fortran/io.c
index 40cd76e..fc97df7 100644
--- a/gcc/fortran/io.c
+++ b/gcc/fortran/io.c
@@ -1763,7 +1763,7 @@ resolve_tag_format (gfc_expr *e)
   if (e->ts.type != BT_CHARACTER)
     {
       if (e->ts.type == BT_DERIVED || e->ts.type == BT_CLASS
-	  || e->ts.type == BT_VOID)
+	  || e->ts.type == BT_VOID || e->ts.type == BT_UNKNOWN)
 	{
 	  gfc_error ("Non-character non-Hollerith in FORMAT tag at %L",
 		     &e->where);
-- 
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