re PR c++/92966 (Segfault on defaulted operator== with wrong return type)

	PR c++/92966
	* method.c (early_check_defaulted_comparison): Don't set
	DECL_MAYBE_DELETED when returning false.

	* g++.dg/cpp2a/spaceship-eq8.C: New test.

From-SVN: r279683

gcc/cp/ChangeLog

 2019-12-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/92966
+	* method.c (early_check_defaulted_comparison): Don't set
+	DECL_MAYBE_DELETED when returning false.
+
 	PR c++/92973
 	* method.c (early_check_defaulted_comparison): For C++17 and earlier
 	diagnose defaulted comparison operators.

gcc/cp/method.c

@@ -1153,7 +1153,7 @@ early_check_defaulted_comparison (tree fn)
     }
 
   /* We still need to deduce deleted/constexpr/noexcept and maybe return. */
-  DECL_MAYBE_DELETED (fn) = true;
+  DECL_MAYBE_DELETED (fn) = ok;
 
   return ok;
 }

gcc/testsuite/ChangeLog

 2019-12-20  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c++/92966
+	* g++.dg/cpp2a/spaceship-eq8.C: New test.
+
 	PR c++/92973
 	* g++.dg/cpp0x/spaceship-eq1.C: New test.
 

gcc/testsuite/g++.dg/cpp2a/spaceship-eq8.C

+// PR c++/92966
+// { dg-do compile { target c++2a } }
+
+struct S {
+  int operator==(const S&) const = default;	// { dg-error "must return 'bool'" }
+  int s;					// { dg-message "declared here" "" { target *-*-* } .-1 }
+};
+static_assert(S{} == S{});			// { dg-error "" }