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).
(cherry picked from commit f0ce88cff75e2020b4beae54b094c77c526724a2)
Bug: none
Test: treehugger
Change-Id: I99de5fa44b488209f60cec59902574e0f91cbce0
diff --git a/Eigen/Core b/Eigen/Core
index 0f7fa63..ac7e394 100644
--- a/Eigen/Core
+++ b/Eigen/Core
@@ -260,6 +260,7 @@
#include <cmath>
#include <cassert>
#include <functional>
+#include <sstream>
#include <iosfwd>
#include <cstring>
#include <string>
diff --git a/Eigen/src/Core/arch/CUDA/Half.h b/Eigen/src/Core/arch/CUDA/Half.h
index 294c517..88dd385 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 {
