Hi, the following Fortran program: $ cat test.F90 program test real :: start_time call cpu_time(start_time) write(*, *) start_time end program test results in a floating point exception using gcc-4.8.4: $ gfortran -O0 -g -ffpe-trap=inexact test.F90 && ./a.out Program received signal SIGFPE: Floating-point exception - erroneous arithmetic operation. Backtrace for this error: #0 0x7FF44712C757 #1 0x7FF44712CD5E #2 0x7FF44665CEEF #3 0x7FF4471FBD82 #4 0x4008A8 in test at test.F90:3 Floating point exception It seems strange that this happens, but maybe I did something wrong? Or is that a known problem? Thanks already, nick