The behavior of the gfortran can be influenced by environment variables.
Malformed environment variables are silently ignored.
TMPDIR—Directory for scratch filesGFORTRAN_STDIN_UNIT—Unit number for standard inputGFORTRAN_STDOUT_UNIT—Unit number for standard outputGFORTRAN_STDERR_UNIT—Unit number for standard errorGFORTRAN_UNBUFFERED_ALL—Do not buffer I/O on all unitsGFORTRAN_UNBUFFERED_PRECONNECTED—Do not buffer I/O on preconnected unitsGFORTRAN_SHOW_LOCUS—Show location for runtime errorsGFORTRAN_OPTIONAL_PLUS—Print leading + where permittedGFORTRAN_LIST_SEPARATOR—Separator for list outputGFORTRAN_CONVERT_UNIT—Set conversion for unformatted I/OGFORTRAN_ERROR_BACKTRACE—Show backtrace on run-time errorsGFORTRAN_FORMATTED_BUFFER_SIZE—Set buffer size for formatted I/OGFORTRAN_UNFORMATTED_BUFFER_SIZE—Set buffer size for unformatted I/O
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Licensed under the GNU Free Documentation License, Version 1.3.
https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gfortran/Runtime.html