From b33a1e1766d1fade064d8c4203eb3ce26360da91 Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Tue, 12 Jun 2018 09:39:44 -0700
Subject: [PATCH] runtime: workaround GCC 4.8 libstdc++ C++11 conformance

libstdc++ included with GCC 4.8 does not define `std::max_align_t` as
required by the C++11 specification.  As a workaround, explicitly create
the definition locally.  This was fixed in GCC 4.9 and later.
---
 stdlib/public/runtime/Casting.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/stdlib/public/runtime/Casting.cpp b/stdlib/public/runtime/Casting.cpp
index 5be857d5fd7e2..e1542177e39e3 100644
--- a/stdlib/public/runtime/Casting.cpp
+++ b/stdlib/public/runtime/Casting.cpp
@@ -44,6 +44,11 @@
 #include <cstring>
 #include <type_traits>
 
+#if defined(__GLIBCXX__) && __GLIBCXX__ < 20160726
+#include <stddef.h>
+namespace std { using ::max_align_t; }
+#endif
+
 using namespace swift;
 using namespace swift::hashable_support;
 using namespace metadataimpl;