From c96a5a86684785e1ba67838e5da325018a6d1f08 Mon Sep 17 00:00:00 2001
From: Arne Morten Kvarving <arne.morten.kvarving@sintef.no>
Date: Fri, 9 Dec 2022 11:49:57 +0100
Subject: [PATCH 1/2] fixed: zero initialize to avoid compiler warnings

---
 tests/test_blackoilfluidstate.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tests/test_blackoilfluidstate.cpp b/tests/test_blackoilfluidstate.cpp
index 81e1e615c..9c9a7110f 100644
--- a/tests/test_blackoilfluidstate.cpp
+++ b/tests/test_blackoilfluidstate.cpp
@@ -44,7 +44,7 @@ int main()
         typedef typename Opm::BlackOilFluidSystem<Scalar> FluidSystem;
         typedef Opm::BlackOilFluidState<Scalar, FluidSystem> FluidState;
 
-        FluidState fs;
+        FluidState fs{};
         checkFluidState<Evaluation>(fs);
     }
 
@@ -54,7 +54,7 @@ int main()
         typedef typename Opm::BlackOilFluidSystem<Scalar> FluidSystem;
         typedef Opm::BlackOilFluidState<Scalar, FluidSystem> FluidState;
 
-        FluidState fs;
+        FluidState fs{};
         checkFluidState<Evaluation>(fs);
     }
 
@@ -64,7 +64,7 @@ int main()
         typedef typename Opm::BlackOilFluidSystem<Scalar> FluidSystem;
         typedef Opm::BlackOilFluidState<Evaluation, FluidSystem> FluidState;
 
-        FluidState fs;
+        FluidState fs{};
         checkFluidState<Evaluation>(fs);
     }
 

From 13dcaf828153dbcd086dcd338e6429f1ee8c89ef Mon Sep 17 00:00:00 2001
From: Arne Morten Kvarving <arne.morten.kvarving@sintef.no>
Date: Fri, 9 Dec 2022 11:51:22 +0100
Subject: [PATCH 2/2] fixed: use std::array to avoid compiler warnings

---
 opm/material/eos/PengRobinson.hpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/opm/material/eos/PengRobinson.hpp b/opm/material/eos/PengRobinson.hpp
index 098a3e281..bf737503f 100644
--- a/opm/material/eos/PengRobinson.hpp
+++ b/opm/material/eos/PengRobinson.hpp
@@ -460,12 +460,12 @@ protected:
         Evaluation b4 = a4 + V*b3;
 
         // invert resulting cubic polynomial analytically
-        Evaluation allV[4];
+        std::array<Evaluation,4> allV;
         allV[0] = V;
-        int numSol = 1 + invertCubicPolynomial<Evaluation>(allV + 1, b1, b2, b3, b4);
+        int numSol = 1 + invertCubicPolynomial<Evaluation>(allV.data() + 1, b1, b2, b3, b4);
 
         // sort all roots of the derivative
-        std::sort(allV + 0, allV + numSol);
+        std::sort(allV.begin(), allV.begin() + numSol);
 
         // check whether the result is physical
         if (numSol != 4 || allV[numSol - 2] < b) {