Lahey/GNU Fortran

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3.12 GFORTRAN_ERROR_BACKTRACE—Show backtrace on run-time errors

If the GFORTRAN_ERROR_BACKTRACE variable is set to `y', `Y' or `1' (only the first letter is relevant) then a backtrace is printed when a serious run-time error occurs. To disable the backtracing, set the variable to `n', `N', `0'. Default is to print a backtrace unless the -fno-backtrace compile option was used.