gcc/fortran/doc/gfortran/compiler-characteristics/files-opened-without-an-explicit-action=-specifier.rst

   1 ..
   2   Copyright 1988-2022 Free Software Foundation, Inc.
   3   This is part of the GCC manual.
   4   For copying conditions, see the copyright.rst file.
   5
   6 .. index:: open, action
   7
   8 .. _files-opened-without-an-explicit-action=-specifier:
   9
  10 Files opened without an explicit ACTION= specifier
  11 **************************************************
  12
  13 The Fortran standard says that if an ``OPEN`` statement is executed
  14 without an explicit ``ACTION=`` specifier, the default value is
  15 processor dependent.  GNU Fortran behaves as follows:
  16
  17 * Attempt to open the file with ``ACTION='READWRITE'``
  18
  19 * If that fails, try to open with ``ACTION='READ'``
  20
  21 * If that fails, try to open with ``ACTION='WRITE'``
  22
  23 * If that fails, generate an error