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/GNU Fortran 7

7.3.1 _gfortran_set_args — Save command-line arguments

Description:

_gfortran_set_args saves the command-line arguments; this initialization is required if any of the command-line intrinsics is called. Additionally, it shall be called if backtracing is enabled (see _gfortran_set_options).

Syntax:

void _gfortran_set_args (int argc, char *argv[])

Arguments:
argc number of command line argument strings
argv the command-line argument strings; argv[0] is the pathname of the executable itself.
Example:
int main (int argc, char *argv[])
{
  /* Initialize libgfortran.  */
  _gfortran_set_args (argc, argv);
  return 0;
}

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https://gcc.gnu.org/onlinedocs/gcc-7.1.0/gfortran/_005fgfortran_005fset_005fargs.html