From f55a6d051bbc30d37aff6d8f9725cdd5934bffe0 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                      | 5 ++++-
 Eigen/src/Core/arch/CUDA/Half.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Eigen/Core b/Eigen/Core
index efdae86cf..ac7c5b300 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -279,7 +279,10 @@
 #include <cmath>
 #include <cassert>
 #include <functional>
-#include <iosfwd>
+#include <sstream>
+#ifndef EIGEN_NO_IO
+  #include <iosfwd>
+#endif
 #include <cstring>
 #include <string>
 #include <limits>
diff --git a/Eigen/src/Core/arch/CUDA/Half.h b/Eigen/src/Core/arch/CUDA/Half.h
index 755e6209d..59717b4fe 100644
--- a/Eigen/src/Core/arch/CUDA/Half.h
+++ b/Eigen/src/Core/arch/CUDA/Half.h
@@ -42,6 +42,7 @@
 #define EIGEN_EXPLICIT_CAST(tgt_type) operator tgt_type()
 #endif
 
+#include <sstream>
 
 namespace Eigen {