From ff0ad4b5e16b8828a6147ae2d5fec8068ef0778e Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Mon, 20 Dec 2021 22:12:33 +0100
Subject: Fortran: BOZ literal constants are not interoperable

gcc/fortran/ChangeLog:

	PR fortran/103778
	* check.c (is_c_interoperable): A BOZ literal constant is not
	interoperable.

gcc/testsuite/ChangeLog:

	PR fortran/103778
	* gfortran.dg/illegal_boz_arg_3.f90: New test.
---
 gcc/fortran/check.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'gcc/fortran')

diff --git a/gcc/fortran/check.c b/gcc/fortran/check.c
index 625473c..b4db933 100644
--- a/gcc/fortran/check.c
+++ b/gcc/fortran/check.c
@@ -5185,6 +5185,12 @@ is_c_interoperable (gfc_expr *expr, const char **msg, bool c_loc, bool c_f_ptr)
       return false;
     }
 
+  if (expr->ts.type == BT_BOZ)
+    {
+      *msg = "BOZ literal constant";
+      return false;
+    }
+
   if (expr->ts.type == BT_CLASS)
     {
       *msg = "Expression is polymorphic";
-- 
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