From f0ce88cff75e2020b4beae54b094c77c526724a2 Mon Sep 17 00:00:00 2001
From: Tobias Bosch <tbosch@google.com>
Date: Mon, 24 Feb 2020 23:09:36 +0000
Subject: [PATCH] Include <sstream> explicitly, and don't rely on the implicit
 include via <complex>.

This implicit dependency does no longer exist in a recent llbm release (sha 78be61871704).
---
 Eigen/Core                         | 1 +
 Eigen/src/Core/arch/Default/Half.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/Eigen/Core b/Eigen/Core
index bb8ad464d..688361d46 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -72,6 +72,7 @@
 #include <cmath>
 #include <cassert>
 #include <functional>
+#include <sstream>
 #ifndef EIGEN_NO_IO
   #include <iosfwd>
 #endif
diff --git a/Eigen/src/Core/arch/Default/Half.h b/Eigen/src/Core/arch/Default/Half.h
index 56782b340..9f4c1ebdf 100644
--- a/Eigen/src/Core/arch/Default/Half.h
+++ b/Eigen/src/Core/arch/Default/Half.h
@@ -42,6 +42,7 @@
 #define EIGEN_EXPLICIT_CAST(tgt_type) operator tgt_type()
 #endif
 
+#include <sstream>
 
 namespace Eigen {