--- gcc/cp/typeck.cc.jj	2023-11-02 07:49:16.135878656 +0100
+++ gcc/cp/typeck.cc	2023-11-13 11:03:42.869760702 +0100
@@ -4976,13 +4976,21 @@ do_warn_enum_conversions (location_t loc
 	case BIT_AND_EXPR:
 	case BIT_IOR_EXPR:
 	case BIT_XOR_EXPR:
-	  warning_at (loc, opt, "bitwise operation between different "
-		      "enumeration types %qT and %qT is deprecated",
-		      type0, type1);
+	  if (cxx_dialect >= cxx26)
+	    pedwarn (loc, opt, "bitwise operation between different "
+		     "enumeration types %qT and %qT", type0, type1);
+	  else
+	    warning_at (loc, opt, "bitwise operation between different "
+			"enumeration types %qT and %qT is deprecated",
+			type0, type1);
 	  return;
 	default:
-	  warning_at (loc, opt, "arithmetic between different enumeration "
-		      "types %qT and %qT is deprecated", type0, type1);
+	  if (cxx_dialect >= cxx26)
+	    pedwarn (loc, opt, "arithmetic between different enumeration "
+		     "types %qT and %qT", type0, type1);
+	  else
+	    warning_at (loc, opt, "arithmetic between different enumeration "
+			"types %qT and %qT is deprecated", type0, type1);
 	  return;
 	}
     }
@@ -5010,7 +5018,13 @@ do_warn_enum_conversions (location_t loc
 	case LE_EXPR:
 	case EQ_EXPR:
 	case NE_EXPR:
-	  if (enum_first_p)
+	  if (enum_first_p && cxx_dialect >= cxx26)
+	    pedwarn (loc, opt, "comparison of enumeration type %qT with "
+		     "floating-point type %qT", type0, type1);
+	  else if (cxx_dialect >= cxx26)
+	    pedwarn (loc, opt, "comparison of floating-point type %qT "
+		      "with enumeration type %qT", type0, type1);
+	  else if (enum_first_p)
 	    warning_at (loc, opt, "comparison of enumeration type %qT with "
 			"floating-point type %qT is deprecated",
 			type0, type1);
@@ -5023,7 +5037,13 @@ do_warn_enum_conversions (location_t loc
 	  /* This is invalid, don't warn.  */
 	  return;
 	default:
-	  if (enum_first_p)
+	  if (enum_first_p && cxx_dialect >= cxx26)
+	    pedwarn (loc, opt, "arithmetic between enumeration type %qT "
+		     "and floating-point type %qT", type0, type1);
+	  else if (cxx_dialect >= cxx26)
+	    pedwarn (loc, opt, "arithmetic between floating-point type %qT "
+		     "and enumeration type %qT", type0, type1);
+	  else if (enum_first_p)
 	    warning_at (loc, opt, "arithmetic between enumeration type %qT "
 			"and floating-point type %qT is deprecated",
 			type0, type1);
@@ -6163,15 +6183,13 @@ cp_build_binary_op (const op_location_t
 	  return error_mark_node;
 	}
       if (complain & tf_warning)
-	{
-	  do_warn_double_promotion (result_type, type0, type1,
-				    "implicit conversion from %qH to %qI "
-				    "to match other operand of binary "
-				    "expression",
-				    location);
-	  do_warn_enum_conversions (location, code, TREE_TYPE (orig_op0),
-				    TREE_TYPE (orig_op1));
-	}
+	do_warn_double_promotion (result_type, type0, type1,
+				  "implicit conversion from %qH to %qI "
+				  "to match other operand of binary "
+				  "expression", location);
+      if (complain & (cxx_dialect >= cxx26 ? tf_warning_or_error : tf_warning))
+	do_warn_enum_conversions (location, code, TREE_TYPE (orig_op0),
+				  TREE_TYPE (orig_op1));
     }
   if (may_need_excess_precision
       && (orig_type0 != type0 || orig_type1 != type1)
--- gcc/cp/call.cc.jj	2023-11-11 08:51:54.419204769 +0100
+++ gcc/cp/call.cc	2023-11-13 11:16:08.033333959 +0100
@@ -6163,19 +6163,30 @@ build_conditional_expr (const op_locatio
 		  == DECL_CONTEXT (stripped_orig_arg3)))
 	    /* Two enumerators from the same enumeration can have different
 	       types when the enumeration is still being defined.  */;
-          else if (complain & tf_warning)
-	    warning_at (loc, OPT_Wenum_compare, "enumerated mismatch "
-			"in conditional expression: %qT vs %qT",
-			arg2_type, arg3_type);
+	  else if (complain & (cxx_dialect >= cxx26
+			       ? tf_warning_or_error : tf_warning))
+	    emit_diagnostic (cxx_dialect >= cxx26 ? DK_PEDWARN : DK_WARNING,
+			     loc, OPT_Wenum_compare, "enumerated mismatch "
+			     "in conditional expression: %qT vs %qT",
+			     arg2_type, arg3_type);
         }
-      else if ((complain & tf_warning)
+      else if ((complain & (cxx_dialect >= cxx26
+			    ? tf_warning_or_error : tf_warning))
 	       && warn_deprecated_enum_float_conv
 	       && ((TREE_CODE (arg2_type) == ENUMERAL_TYPE
 		    && SCALAR_FLOAT_TYPE_P (arg3_type))
 		   || (SCALAR_FLOAT_TYPE_P (arg2_type)
 		       && TREE_CODE (arg3_type) == ENUMERAL_TYPE)))
 	{
-	  if (TREE_CODE (arg2_type) == ENUMERAL_TYPE)
+	  if (cxx_dialect >= cxx26 && TREE_CODE (arg2_type) == ENUMERAL_TYPE)
+	    pedwarn (loc, OPT_Wdeprecated_enum_float_conversion,
+		     "conditional expression between enumeration type "
+		     "%qT and floating-point type %qT", arg2_type, arg3_type);
+	  else if (cxx_dialect >= cxx26)
+	    pedwarn (loc, OPT_Wdeprecated_enum_float_conversion,
+		     "conditional expression between floating-point type "
+		     "%qT and enumeration type %qT", arg2_type, arg3_type);
+	  else if (TREE_CODE (arg2_type) == ENUMERAL_TYPE)
 	    warning_at (loc, OPT_Wdeprecated_enum_float_conversion,
 			"conditional expression between enumeration type "
 			"%qT and floating-point type %qT is deprecated",
@@ -7259,10 +7270,13 @@ build_new_op (const op_location_t &loc,
 		  && TREE_CODE (arg2_type) == ENUMERAL_TYPE
 		  && (TYPE_MAIN_VARIANT (arg1_type)
 		      != TYPE_MAIN_VARIANT (arg2_type))
-		  && (complain & tf_warning))
-		warning_at (loc, OPT_Wenum_compare,
-			    "comparison between %q#T and %q#T",
-			    arg1_type, arg2_type);
+		  && (complain & (cxx_dialect >= cxx26
+				  ? tf_warning_or_error : tf_warning)))
+		emit_diagnostic (cxx_dialect >= cxx26
+				 ? DK_PEDWARN : DK_WARNING,
+				 loc, OPT_Wenum_compare,
+				 "comparison between %q#T and %q#T",
+				 arg1_type, arg2_type);
 	      break;
 	    default:
 	      break;
--- gcc/testsuite/g++.dg/cpp2a/enum-conv1.C.jj	2020-10-30 08:59:57.068496404 +0100
+++ gcc/testsuite/g++.dg/cpp2a/enum-conv1.C	2023-11-13 11:38:24.454690122 +0100
@@ -14,11 +14,16 @@ void
 conv ()
 {
   bool b1 = e == e1;
-  bool b2 = e == f; // { dg-warning "comparison between .enum E1. and .enum E2." }
-  bool b3 = e == 0.0; // { dg-warning "comparison of enumeration type .E1. with floating-point type .double." "" { target c++20 } }
-  bool b4 = 0.0 == f; // { dg-warning "comparison of floating-point type .double. with enumeration type .E2." "" { target c++20 } }
-  int n1 = true ? e : f; // { dg-warning "enumerated mismatch" }
-  int n2 = true ? e : 0.0; // { dg-warning "conditional expression between" "" { target c++20 } }
+  bool b2 = e == f; // { dg-warning "comparison between .enum E1. and .enum E2." "" { target c++23_down } }
+		    // { dg-error "comparison between .enum E1. and .enum E2." "" { target c++26 } .-1 }
+  bool b3 = e == 0.0; // { dg-warning "comparison of enumeration type .E1. with floating-point type .double." "" { target { c++20 && c++23_down } } }
+		      // { dg-error "comparison of enumeration type .E1. with floating-point type .double." "" { target c++26 } .-1 }
+  bool b4 = 0.0 == f; // { dg-warning "comparison of floating-point type .double. with enumeration type .E2." "" { target { c++20 && c++23_down } } }
+		      // { dg-error "comparison of floating-point type .double. with enumeration type .E2." "" { target c++26 } .-1 }
+  int n1 = true ? e : f; // { dg-warning "enumerated mismatch" "" { target c++23_down } }
+			 // { dg-error "enumerated mismatch" "" { target c++26 } .-1 }
+  int n2 = true ? e : 0.0; // { dg-warning "conditional expression between" "" { target { c++20 && c++23_down } } }
+			   // { dg-error "conditional expression between" "" { target c++26 } .-1 }
 }
 
 int
@@ -29,42 +34,60 @@ enum_enum (bool b)
 
   r += e - e;
   r += e - e1;
-  r += e - f; // { dg-warning "arithmetic between different enumeration types .E1. and .E2." "" { target c++20 } }
-  r += f - e; // { dg-warning "arithmetic between different enumeration types .E2. and .E1." "" { target c++20 } }
-
+  r += e - f; // { dg-warning "arithmetic between different enumeration types .E1. and .E2." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "arithmetic between different enumeration types .E1. and .E2." "" { target c++26 } .-1 }
+  r += f - e; // { dg-warning "arithmetic between different enumeration types .E2. and .E1." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "arithmetic between different enumeration types .E2. and .E1." "" { target c++26 } .-1 }
   r += f + f;
-  r += f + e; // { dg-warning "arithmetic between different enumeration types .E2. and .E1." "" { target c++20 } }
-  r += e + f; // { dg-warning "arithmetic between different enumeration types .E1. and .E2." "" { target c++20 } }
+  r += f + e; // { dg-warning "arithmetic between different enumeration types .E2. and .E1." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "arithmetic between different enumeration types .E2. and .E1." "" { target c++26 } .-1 }
+  r += e + f; // { dg-warning "arithmetic between different enumeration types .E1. and .E2." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "arithmetic between different enumeration types .E1. and .E2." "" { target c++26 } .-1 }
 
-  r += e1 - e2; // { dg-warning "arithmetic between different enumeration types .E1. and .E2." "" { target c++20 } }
+  r += e1 - e2; // { dg-warning "arithmetic between different enumeration types .E1. and .E2." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "arithmetic between different enumeration types .E1. and .E2." "" { target c++26 } .-1 }
   r += e1 - e1c;
   r += e1c - e1;
 
-  r += e * f; // { dg-warning "arithmetic between different enumeration types .E1. and .E2." "" { target c++20 } }
-  r += f * e; // { dg-warning "arithmetic between different enumeration types .E2. and .E1." "" { target c++20 } }
+  r += e * f; // { dg-warning "arithmetic between different enumeration types .E1. and .E2." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "arithmetic between different enumeration types .E1. and .E2." "" { target c++26 } .-1 }
+  r += f * e; // { dg-warning "arithmetic between different enumeration types .E2. and .E1." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "arithmetic between different enumeration types .E2. and .E1." "" { target c++26 } .-1 }
   r += e * e;
 
   r += e1 < e1c;
   r += e < e1;
-  r += e1 < e2; // { dg-warning "comparison between .enum E1. and .enum E2." }
-  r += e < f; // { dg-warning "comparison between .enum E1. and .enum E2." }
-  r += f < e; // { dg-warning "comparison between .enum E2. and .enum E1." }
+  r += e1 < e2; // { dg-warning "comparison between .enum E1. and .enum E2." "" { target c++23_down } }
+		// { dg-error "comparison between .enum E1. and .enum E2." "" { target c++26 } .-1 }
+  r += e < f; // { dg-warning "comparison between .enum E1. and .enum E2." "" { target c++23_down } }
+	      // { dg-error "comparison between .enum E1. and .enum E2." "" { target c++26 } .-1 }
+  r += f < e; // { dg-warning "comparison between .enum E2. and .enum E1." "" { target c++23_down } }
+	      // { dg-error "comparison between .enum E2. and .enum E1." "" { target c++26 } .-1 }
 
   r += e1 == e1c;
   r += e == e1;
-  r += e == f; // { dg-warning "comparison between .enum E1. and .enum E2." }
-  r += f == e; // { dg-warning "comparison between .enum E2. and .enum E1." }
-  r += e1 == e2; // { dg-warning "comparison between .enum E1. and .enum E2." }
-  r += e2 == e1; // { dg-warning "comparison between .enum E2. and .enum E1." }
+  r += e == f; // { dg-warning "comparison between .enum E1. and .enum E2." "" { target c++23_down } }
+	       // { dg-error "comparison between .enum E1. and .enum E2." "" { target c++26 } .-1 }
+  r += f == e; // { dg-warning "comparison between .enum E2. and .enum E1." "" { target c++23_down } }
+	       // { dg-error "comparison between .enum E2. and .enum E1." "" { target c++26 } .-1 }
+  r += e1 == e2; // { dg-warning "comparison between .enum E1. and .enum E2." "" { target c++23_down } }
+		 // { dg-error "comparison between .enum E1. and .enum E2." "" { target c++26 } .-1 }
+  r += e2 == e1; // { dg-warning "comparison between .enum E2. and .enum E1." "" { target c++23_down } }
+		 // { dg-error "comparison between .enum E2. and .enum E1." "" { target c++26 } .-1 }
 
   r += b ? e1 : e1c;
   r += b ? e1 : e;
-  r += b ? f : e; // { dg-warning "enumerated mismatch in conditional expression: .E2. vs .E1." }
-  r += b ? e1 : e2; // { dg-warning "enumerated mismatch in conditional expression: .E1. vs .E2." }
-
-  r += e | f; // { dg-warning "bitwise operation between different enumeration types .E1. and .E2." "" { target c++20 } }
-  r += e ^ f; // { dg-warning "bitwise operation between different enumeration types .E1. and .E2." "" { target c++20 } }
-  r += e & f; // { dg-warning "bitwise operation between different enumeration types .E1. and .E2." "" { target c++20 } }
+  r += b ? f : e; // { dg-warning "enumerated mismatch in conditional expression: .E2. vs .E1." "" { target c++23_down } }
+		  // { dg-error "enumerated mismatch in conditional expression: .E2. vs .E1." "" { target c++26 } .-1 }
+  r += b ? e1 : e2; // { dg-warning "enumerated mismatch in conditional expression: .E1. vs .E2." "" { target c++23_down } }
+		    // { dg-error "enumerated mismatch in conditional expression: .E1. vs .E2." "" { target c++26 } .-1 }
+
+  r += e | f; // { dg-warning "bitwise operation between different enumeration types .E1. and .E2." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "bitwise operation between different enumeration types .E1. and .E2." "" { target c++26 } .-1 }
+  r += e ^ f; // { dg-warning "bitwise operation between different enumeration types .E1. and .E2." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "bitwise operation between different enumeration types .E1. and .E2." "" { target c++26 } .-1 }
+  r += e & f; // { dg-warning "bitwise operation between different enumeration types .E1. and .E2." "" { target { c++20 && c++23_down } } }
+	      // { dg-error "bitwise operation between different enumeration types .E1. and .E2." "" { target c++26 } .-1 }
   r += !e;
   r += e1 | e;
 
@@ -76,10 +99,14 @@ enum_enum (bool b)
 
   // Anonymous enum.
   r += u1 - u1;
-  r += u1 + u2; // { dg-warning "arithmetic between different enumeration types" "" { target c++20 } }
-  r += u1 * u2; // { dg-warning "arithmetic between different enumeration types" "" { target c++20 } }
-  r += u1 == u2; // { dg-warning "comparison between" }
-  r += u1 & u2; // { dg-warning "bitwise operation between different enumeration types" "" { target c++20 } }
+  r += u1 + u2; // { dg-warning "arithmetic between different enumeration types" "" { target { c++20 && c++23_down } } }
+		// { dg-error "arithmetic between different enumeration types" "" { target c++26 } .-1 }
+  r += u1 * u2; // { dg-warning "arithmetic between different enumeration types" "" { target { c++20 && c++23_down } } }
+		// { dg-error "arithmetic between different enumeration types" "" { target c++26 } .-1 }
+  r += u1 == u2; // { dg-warning "comparison between" "" { target c++23_down } }
+		 // { dg-error "comparison between" "" { target c++26 } .-1 }
+  r += u1 & u2; // { dg-warning "bitwise operation between different enumeration types" "" { target { c++20 && c++23_down } } }
+		// { dg-error "bitwise operation between different enumeration types" "" { target c++26 } .-1 }
 
   return r;
 }
@@ -89,28 +116,47 @@ enum_float (bool b)
 {
   double r = 0.0;
 
-  r += e1 - d; // { dg-warning "arithmetic between enumeration type .E1. and floating-point type .double." "" { target c++20 } }
-  r += d - e1; // { dg-warning "arithmetic between floating-point type .double. and enumeration type .E1." "" { target c++20 } }
-  r += e1 + d; // { dg-warning "arithmetic between enumeration type .E1. and floating-point type .double." "" { target c++20 } }
-  r += d + e1; // { dg-warning "arithmetic between floating-point type .double. and enumeration type .E1." "" { target c++20 } }
-  r += e1 * d; // { dg-warning "arithmetic between enumeration type .E1. and floating-point type .double." "" { target c++20 } }
-  r += d * e1; // { dg-warning "arithmetic between floating-point type .double. and enumeration type .E1." "" { target c++20 } }
-  r += u1 * d; // { dg-warning "arithmetic between enumeration type" "" { target c++20 } }
-  r += d * u1; // { dg-warning "arithmetic between floating-point type" "" { target c++20 } }
-
-  r += e1 < d;  // { dg-warning "comparison of enumeration type .E1. with floating-point type .double." "" { target c++20 } }
-  r += d < e1;  // { dg-warning "comparison of floating-point type .double. with enumeration type .E1." "" { target c++20 } }
-  r += d == e1; // { dg-warning "comparison of floating-point type .double. with enumeration type .E1." "" { target c++20 } }
-  r += e1 == d; // { dg-warning "comparison of enumeration type .E1. with floating-point type .double." "" { target c++20 } }
-  r += u1 == d; // { dg-warning "comparison of enumeration type" "" { target c++20 } }
-  r += d == u1; // { dg-warning "comparison of floating-point type" "" { target c++20 } }
-
-  r += b ? e1 : d; // { dg-warning "conditional expression between enumeration type .E1. and floating-point type .double." "" { target c++20 } }
-  r += b ? d : e1; // { dg-warning "conditional expression between floating-point type .double. and enumeration type .E1." "" { target c++20 } }
-  r += b ? d : u1; // { dg-warning "conditional expression between" "" { target c++20 } }
-  r += b ? u1 : d; // { dg-warning "conditional expression between" "" { target c++20 } }
+  r += e1 - d; // { dg-warning "arithmetic between enumeration type .E1. and floating-point type .double." "" { target { c++20 && c++23_down } } }
+	       // { dg-error "arithmetic between enumeration type .E1. and floating-point type .double." "" { target c++26 } .-1 }
+  r += d - e1; // { dg-warning "arithmetic between floating-point type .double. and enumeration type .E1." "" { target { c++20 && c++23_down } } }
+	       // { dg-error "arithmetic between floating-point type .double. and enumeration type .E1." "" { target c++26 } .-1 }
+  r += e1 + d; // { dg-warning "arithmetic between enumeration type .E1. and floating-point type .double." "" { target { c++20 && c++23_down } } }
+	       // { dg-error "arithmetic between enumeration type .E1. and floating-point type .double." "" { target c++26 } .-1 }
+  r += d + e1; // { dg-warning "arithmetic between floating-point type .double. and enumeration type .E1." "" { target { c++20 && c++23_down } } }
+	       // { dg-error "arithmetic between floating-point type .double. and enumeration type .E1." "" { target c++26 } .-1 }
+  r += e1 * d; // { dg-warning "arithmetic between enumeration type .E1. and floating-point type .double." "" { target { c++20 && c++23_down } } }
+	       // { dg-error "arithmetic between enumeration type .E1. and floating-point type .double." "" { target c++26 } .-1 }
+  r += d * e1; // { dg-warning "arithmetic between floating-point type .double. and enumeration type .E1." "" { target { c++20 && c++23_down } } }
+	       // { dg-error "arithmetic between floating-point type .double. and enumeration type .E1." "" { target c++26 } .-1 }
+  r += u1 * d; // { dg-warning "arithmetic between enumeration type" "" { target { c++20 && c++23_down } } }
+	       // { dg-error "arithmetic between enumeration type" "" { target c++26 } .-1 }
+  r += d * u1; // { dg-warning "arithmetic between floating-point type" "" { target { c++20 && c++23_down } } }
+	       // { dg-error "arithmetic between floating-point type" "" { target c++26 } .-1 }
+
+  r += e1 < d;  // { dg-warning "comparison of enumeration type .E1. with floating-point type .double." "" { target { c++20 && c++23_down } } }
+		// { dg-error "comparison of enumeration type .E1. with floating-point type .double." "" { target c++26 } .-1 }
+  r += d < e1;  // { dg-warning "comparison of floating-point type .double. with enumeration type .E1." "" { target { c++20 && c++23_down } } }
+		// { dg-error "comparison of floating-point type .double. with enumeration type .E1." "" { target c++26 } .-1 }
+  r += d == e1; // { dg-warning "comparison of floating-point type .double. with enumeration type .E1." "" { target { c++20 && c++23_down } } }
+		// { dg-error "comparison of floating-point type .double. with enumeration type .E1." "" { target c++26 } .-1 }
+  r += e1 == d; // { dg-warning "comparison of enumeration type .E1. with floating-point type .double." "" { target { c++20 && c++23_down } } }
+		// { dg-error "comparison of enumeration type .E1. with floating-point type .double." "" { target c++26 } .-1 }
+  r += u1 == d; // { dg-warning "comparison of enumeration type" "" { target { c++20 && c++23_down } } }
+		// { dg-error "comparison of enumeration type" "" { target c++26 } .-1 }
+  r += d == u1; // { dg-warning "comparison of floating-point type" "" { target { c++20 && c++23_down } } }
+		// { dg-error "comparison of floating-point type" "" { target c++26 } .-1 }
+
+  r += b ? e1 : d; // { dg-warning "conditional expression between enumeration type .E1. and floating-point type .double." "" { target { c++20 && c++23_down } } }
+		   // { dg-error "conditional expression between enumeration type .E1. and floating-point type .double." "" { target c++26 } .-1 }
+  r += b ? d : e1; // { dg-warning "conditional expression between floating-point type .double. and enumeration type .E1." "" { target { c++20 && c++23_down } } }
+		   // { dg-error "conditional expression between floating-point type .double. and enumeration type .E1." "" { target c++26 } .-1 }
+  r += b ? d : u1; // { dg-warning "conditional expression between" "" { target { c++20 && c++23_down } } }
+		   // { dg-error "conditional expression between" "" { target c++26 } .-1 }
+  r += b ? u1 : d; // { dg-warning "conditional expression between" "" { target { c++20 && c++23_down } } }
+		   // { dg-error "conditional expression between" "" { target c++26 } .-1 }
 
-  d += e1; // { dg-warning "arithmetic between floating-point type .double. and enumeration type .E1." "" { target c++20 } }
+  d += e1; // { dg-warning "arithmetic between floating-point type .double. and enumeration type .E1." "" { target { c++20 && c++23_down } } }
+	   // { dg-error "arithmetic between floating-point type .double. and enumeration type .E1." "" { target c++26 } .-1 }
   d = e1;
 
   return r;
--- gcc/testsuite/g++.dg/diagnostic/enum3.C.jj	2021-06-09 10:20:08.971342523 +0200
+++ gcc/testsuite/g++.dg/diagnostic/enum3.C	2023-11-13 12:28:19.035521575 +0100
@@ -5,5 +5,6 @@ enum e1 { e1val };
 enum e2 { e3val };
 
 int main( int, char * [] ) {
-   if ( e1val == e3val ) return 1; // { dg-warning -Wenum-compare }
+   if ( e1val == e3val ) return 1; // { dg-warning "comparison between 'enum e1' and 'enum e2'" "" { target c++23_down } }
+				   // { dg-error "comparison between 'enum e1' and 'enum e2'" "" { target c++26 } .-1 }
 }
--- gcc/testsuite/g++.dg/parse/attr3.C.jj	2020-10-29 10:10:11.569397839 +0100
+++ gcc/testsuite/g++.dg/parse/attr3.C	2023-11-13 12:29:13.241759469 +0100
@@ -10,5 +10,6 @@ int main () {
     S::F y;	// { dg-warning "'F' is deprecated" }
     y = S::f;
 
-    return x + y; // { dg-warning "arithmetic between different enumeration types" "" { target c++20 } }
+    return x + y; // { dg-warning "arithmetic between different enumeration types" "" { target { c++20 && c++23_down } } }
+		  // { dg-error "arithmetic between different enumeration types" "" { target c++26 } .-1 }
 }
--- gcc/testsuite/g++.dg/cpp0x/linkage2.C.jj	2020-10-29 10:10:11.560397940 +0100
+++ gcc/testsuite/g++.dg/cpp0x/linkage2.C	2023-11-13 12:30:26.712726512 +0100
@@ -29,5 +29,6 @@ void f() {
   ba.g(a);              // OK
   ba.h(a);              // error, B<T>::h never defined
   i(ba, a);             // OK
-  e1+e2+e3; // { dg-warning "arithmetic between different enumeration types" "" { target c++20 } }
+  e1+e2+e3; // { dg-warning "arithmetic between different enumeration types" "" { target { c++20 && c++23_down } } }
+	    // { dg-error "arithmetic between different enumeration types" "" { target c++26 } .-1 }
 }
