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--></style></head><body lang=EN-US link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Dear Paolo,</p><p class=MsoNormal>Thank you for heping. </p><p class=MsoNormal>I found the problems. Gcc4.8 is not good for compiling QE 6.8. It will meet some errors.</p><p class=MsoNormal>1 . I used gcc 10.2 to re-compiled mpi/openmp </p><p class=MsoNormal>2. I use gcc 10.2 to compiled libxc, </p><p class=MsoNormal>3. I use gcc 10.2 and intel mkl libs to compile QE6.8 (with libxc)</p><p class=MsoNormal>Then QE6.8 looks good. </p><p class=MsoNormal>However, when I use SCAN via “ input_dft = “ wth SCAN pseudopotential, it will have “ Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG” in the end. But the calculations are correct.</p><p class=MsoNormal>However, if I use PBE or TPSS (with PBE pseudopotential or tpss pps), it is pretty good, has no such “Note”. </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Is there any way I can go around this issue? </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you very much.</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best,</p><p class=MsoNormal>Hong</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal> </p><p class=MsoNormal> </p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>