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/GNU Fortran 7

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.

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/GFORTRAN_005fERROR_005fBACKTRACE.html