From 490a091fa7397e34b04e72634c3d37d8a4e223a4 Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Tue, 17 Dec 2019 16:45:19 -0500
Subject: [PATCH] * name-lookup.c (get_std_name_hint): Add std::byte.

From-SVN: r279471
---
 gcc/cp/ChangeLog                                    | 4 ++++
 gcc/cp/name-lookup.c                                | 2 ++
 gcc/testsuite/g++.dg/lookup/missing-std-include-9.C | 3 +++
 3 files changed, 9 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/lookup/missing-std-include-9.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 6b5849e45b3..e8a94f463e5 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,7 @@
+2019-12-17  Jason Merrill  <jason@redhat.com>
+
+	* name-lookup.c (get_std_name_hint): Add std::byte.
+
 2019-12-17  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c++/59655
diff --git a/gcc/cp/name-lookup.c b/gcc/cp/name-lookup.c
index e64cd9a9d66..181dad0e2f2 100644
--- a/gcc/cp/name-lookup.c
+++ b/gcc/cp/name-lookup.c
@@ -5641,6 +5641,8 @@ get_std_name_hint (const char *name)
     /* <condition_variable>. */
     {"condition_variable", "<condition_variable>", cxx11},
     {"condition_variable_any", "<condition_variable>", cxx11},
+    /* <cstddef>.  */
+    {"byte", "<cstddef>", cxx17},
     /* <deque>.  */
     {"deque", "<deque>", cxx98},
     /* <forward_list>.  */
diff --git a/gcc/testsuite/g++.dg/lookup/missing-std-include-9.C b/gcc/testsuite/g++.dg/lookup/missing-std-include-9.C
new file mode 100644
index 00000000000..f8e1e1dd8a7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lookup/missing-std-include-9.C
@@ -0,0 +1,3 @@
+std::byte b;		 // { dg-error "byte" }
+// { dg-message "cstddef" "" { target c++17 } .-1 }
+// { dg-message "C..17" "" { target c++14_down } .-2 }