re PR c++/92732 (Bit-field of scoped enumeration type cannot be initialized)

	PR c++/92732
	* typeck2.c (digest_nsdmi_init): For bitfields, use
	DECL_BIT_FIELD_TYPE instead of TREE_TYPE.

	* g++.dg/cpp2a/bitfield3.C: Don't expect narrowing conversion
	warnings.
	* g++.dg/cpp2a/bitfield4.C: New test.

From-SVN: r278923

gcc/cp/ChangeLog

+2019-12-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/92732
+	* typeck2.c (digest_nsdmi_init): For bitfields, use
+	DECL_BIT_FIELD_TYPE instead of TREE_TYPE.
+
 2019-12-03  Jason Merrill  <jason@redhat.com>
 	    Jakub Jelinek  <jakub@redhat.com>
 

gcc/cp/typeck2.c

@@ -1335,6 +1335,8 @@ digest_nsdmi_init (tree decl, tree init, tsubst_flags_t complain)
   gcc_assert (TREE_CODE (decl) == FIELD_DECL);
 
   tree type = TREE_TYPE (decl);
+  if (DECL_BIT_FIELD_TYPE (decl))
+    type = DECL_BIT_FIELD_TYPE (decl);
   int flags = LOOKUP_IMPLICIT;
   if (DIRECT_LIST_INIT_P (init))
     {

gcc/testsuite/ChangeLog

 2019-12-03  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/92732
+	* g++.dg/cpp2a/bitfield3.C: Don't expect narrowing conversion
+	warnings.
+	* g++.dg/cpp2a/bitfield4.C: New test.
+
 	PR c++/92705
 	* g++.dg/conversion/ambig4.C: New test.
 

gcc/testsuite/g++.dg/cpp2a/bitfield3.C

@@ -15,11 +15,9 @@ const int b = 0;
 struct S {
   int c : 5 = 2 * a;			// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
   int d : 6 { c + a };			// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
-					// { dg-warning "narrowing conversion of" "" { target *-*-* } .-1 }
   int e : true ? 7 : a = 3;
   int f : (true ? 8 : b) = d + a;	// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
   int g : (true ? 9 : b) { f + a };	// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
-					// { dg-warning "narrowing conversion of" "" { target *-*-* } .-1 }
   int h : 1 || new int { 0 };
   int i = g + a;
 };
@@ -28,11 +26,9 @@ template <bool V, int W>
 struct U {
   int j : W = 3 * a;			// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
   int k : W { j + a };			// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
-					// { dg-warning "narrowing conversion of" "" { target *-*-* } .-1 }
   int l : V ? 7 : a = 3;
   int m : (V ? W : b) = k + a;		// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
   int n : (V ? W : b) { m + a };	// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
-					// { dg-warning "narrowing conversion of" "" { target *-*-* } .-1 }
   int o : 1 || new int { 0 };
   int p = n + a;
 };

gcc/testsuite/g++.dg/cpp2a/bitfield4.C

+// PR c++/92732
+// { dg-do compile { target c++17 } }
+// { dg-options "" }
+
+enum class byte : unsigned char { };
+using uint8_t = unsigned char;
+
+struct T
+{
+  byte a : 2 = byte{0};	// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
+  uint8_t b : 2 = 0;	// { dg-warning "default member initializers for bit-fields only available with" "" { target c++17_down } }
+} t;