From 309620ee1f6fe02f5895118aa48a7f08c55ff5ba Mon Sep 17 00:00:00 2001
From: Christoph Hertzberg <chtz@informatik.uni-bremen.de>
Date: Fri, 12 Dec 2014 11:53:24 +0100
Subject: [PATCH] Make absolutely sure that tau is initialized (this change
 suppresses a gcc warning)

---
 Eigen/src/SparseQR/SparseQR.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/Eigen/src/SparseQR/SparseQR.h b/Eigen/src/SparseQR/SparseQR.h
index e2d7149c4..a00bd5db1 100644
--- a/Eigen/src/SparseQR/SparseQR.h
+++ b/Eigen/src/SparseQR/SparseQR.h
@@ -476,7 +476,7 @@ void SparseQR<MatrixType,OrderingType>::factorize(const MatrixType& mat)
       }
     } // End update current column
     
-    Scalar tau;
+    Scalar tau = 0;
     RealScalar beta = 0;
     
     if(nonzeroCol < diagSize)
@@ -490,7 +490,6 @@ void SparseQR<MatrixType,OrderingType>::factorize(const MatrixType& mat)
       for (Index itq = 1; itq < nzcolQ; ++itq) sqrNorm += numext::abs2(tval(Qidx(itq)));
       if(sqrNorm == RealScalar(0) && numext::imag(c0) == RealScalar(0))
       {
-        tau = RealScalar(0);
         beta = numext::real(c0);
         tval(Qidx(0)) = 1;
       }