From 02ef38020be62e5889d655fb3783dc2fe4bd0692 Mon Sep 17 00:00:00 2001
From: Rasmus Munk Larsen <rmlarsen@google.com>
Date: Tue, 11 Aug 2020 17:54:22 -0700
Subject: [PATCH] Fix incorrect use of std::abs reported in #1823.

---
 Eigen/src/PardisoSupport/PardisoSupport.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Eigen/src/PardisoSupport/PardisoSupport.h b/Eigen/src/PardisoSupport/PardisoSupport.h
index 091c3970e..f8c7d0780 100644
--- a/Eigen/src/PardisoSupport/PardisoSupport.h
+++ b/Eigen/src/PardisoSupport/PardisoSupport.h
@@ -192,7 +192,8 @@ class PardisoImpl : public SparseSolverBase<Derived>
     void pardisoInit(int type)
     {
       m_type = type;
-      bool symmetric = std::abs(m_type) < 10;
+      EIGEN_USING_STD(abs);
+      bool symmetric = abs(m_type) < 10;
       m_iparm[0] = 1;   // No solver default
       m_iparm[1] = 2;   // use Metis for the ordering
       m_iparm[2] = 0;   // Reserved. Set to zero. (??Numbers of processors, value of OMP_NUM_THREADS??)