From ffa0241a03f917405634a744793a48877dfc22de Mon Sep 17 00:00:00 2001
From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Tue, 13 Sep 2016 18:35:34 +0000
Subject: [PATCH] Work around a GCC 4.7-specific issue: due to implementing
 older rules for implicit declarations of move operations, GCC 4.7 would find
 that SelectPiece has neither a move constructor nor a copy constructor. The
 copy constructor was (correctly) deleted because the class has a member of
 move-only type, and the move constructor was (incorrectly, per current C++
 rules) not provided because the class has a copy-only base class (in turn
 because it explicitly declares a destructor).

llvm-svn: 281363
---
 clang/utils/TableGen/ClangDiagnosticsEmitter.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp b/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
index dafb93158abd..d6881ae3074a 100644
--- a/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
+++ b/clang/utils/TableGen/ClangDiagnosticsEmitter.cpp
@@ -910,6 +910,11 @@ namespace {
 /// Diagnostic text, parsed into pieces.
 struct DiagText {
   struct Piece {
+    // This type and its derived classes are move-only.
+    Piece() = default;
+    Piece(Piece &&O) = default;
+    Piece &operator=(Piece &&O) = default;
+
     virtual void print(std::vector<std::string> &RST) = 0;
     virtual ~Piece() {}
   };