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/GNU Fortran 7

7.3.6 _gfortran_set_max_subrecord_length — Set subrecord length

Description:

_gfortran_set_max_subrecord_length set the maximum length for a subrecord. This option only makes sense for testing and debugging of unformatted I/O.

Syntax:

void _gfortran_set_max_subrecord_length (int val)

Arguments:
val the maximum length for a subrecord; the maximum permitted value is 2147483639, which is also the default.
Example:
int main (int argc, char *argv[])
{
  /* Initialize libgfortran.  */
  _gfortran_set_args (argc, argv);
  _gfortran_set_max_subrecord_length (8);
  return 0;
}

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/_005fgfortran_005fset_005fmax_005fsubrecord_005flength.html