CFD Online Discussion Forums - undefined reference

Hallo,

I am trying to edit reactingFoam solver, to add porous capability. In the process, i got a error "temporary deallocated error", so, as to clear that error, i did some changes in the code. Now, deallocation error is gone, but getting a new error, which says "undefined reference to `trTU()'". trTU() is a tmp variable created in Ueqn.H. By some research, i came to know its a linker error, but dont know how to resolve it:confused:. Please have a look at the UEqn.H code and the error msg, and let me know, your views. Thanks.

Code:

MRF.correctBoundaryVelocity(U);



    tmp<fvVectorMatrix> tUEqn

    (

        fvm::ddt(rho, U) + fvm::div(phi, U)

      + MRF.DDt(rho, U)

      + turbulence->divDevTau(U)

     ==

        fvOptions(rho, U)

    );

    fvVectorMatrix& UEqn = tUEqn.ref();



    UEqn.relax();



    tmp<volScalarField> trAU(); //trAU;

    tmp<volTensorField> trTU(); //trTU;



    if (pressureImplicitPorosity)

    {

    tmp<volTensorField> tTU = tensor(I)*UEqn.A();

    pZones.addResistance(UEqn, tTU.ref());

    trTU() = inv(tTU());

    trTU().ref().rename("rAU");

    fvOptions.constrain(UEqn);

    volVectorField gradp(fvc::reconstruct

            ( (

                  - ghf*fvc::snGrad(rho)

                  - fvc::snGrad(p_rgh)

            )*mesh.magSf()

            ) );

        for (int UCorr=0; UCorr<nUCorr; UCorr++)

        {

         U = trTU() & (UEqn.H() - gradp);

        }

    U.correctBoundaryConditions();

    fvOptions.correct(U);

    K = 0.5*magSqr(U);

    }



   else



   {

   pZones.addResistance(UEqn);

   fvOptions.constrain(UEqn);

        if(pimple.momentumPredictor())

        {

        solve

        (

            UEqn

         ==

            fvc::reconstruct

            (

            (

                  - ghf*fvc::snGrad(rho)

                  - fvc::snGrad(p_rgh)

            )*mesh.magSf()

            )

        );



        fvOptions.correct(U);

        K = 0.5*magSqr(U);

        trAU() = 1.0/UEqn.A();

        trAU().ref().rename("rAU");

"UEqn.H" 88L, 1820C

cheers,
nm.