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/GNU Fortran 7

6.1.19 Read/Write after EOF marker

Some legacy codes rely on allowing READ or WRITE after the EOF file marker in order to find the end of a file. GNU Fortran normally rejects these codes with a run-time error message and suggests the user consider BACKSPACE or REWIND to properly position the file before the EOF marker. As an extension, the run-time error may be disabled using -std=legacy.

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/Read_002fWrite-after-EOF-marker.html