use strict;
use warnings;

use do_compile_time_arg_check;
# Checks if the first arg is --log or --log="file name".
# Imports LOGGING as a constant sub.
# Imports strict-safe $LOG_FILE_NAME.

if (LOGGING) {
   if (defined($LOG_FILE_NAME)) {
      open(LOG_FH, '>>', $LOG_FILE_NAME)
      or die("Can't open log file: $!\n");
   } else {
      open(LOG_FH, '>&STDERR')
      or die("Can't dup STDERR: $!\n");
   }
}

print LOG_FH ('Opening log file at '.localtime().".$/") if LOGGING;