Avoid crash when Octave invoked with '-d' argument.

* options.h (short_opts): Remove 'd' from list of short options that getopts()
will accept.

* octave.cc: #include <cstdlib> for access to exit() function.
* octave.cc (cmdline_options): Replace call to Octave error() function (which
requires an interpreter to available) with call to std::cerr to output error
message and std::exit to stop the program.

Author: Rik

libinterp/octave.cc

@@ -29,6 +29,8 @@
 #  include "config.h"
 #endif
 
+#include <cstdlib>
+
 #include <iostream>
 #include <string>
 
@@ -230,9 +232,9 @@ cmdline_options::cmdline_options (int argc, char **argv)
           // getopt_long should print a message about unrecognized options and
           // return '?', which is handled above.  If we end up here, it is
           // because there was an option but we forgot to handle it.
-          // That should be fatal.
-
-          error ("unexpected option (= %d) - please reportt this bug", optc);
+          // This is fatal.
+          std::cerr << "unexpected option (= " << optc << ") - please report this bug\n";
+          std::exit (EXIT_FAILURE);
           break;
         }
     }

libinterp/options.h

@@ -33,7 +33,7 @@
 // This is here so that it's more likely that the usage message and
 // the real set of options will agree.  Note: the '+' must come first
 // to prevent getopt from permuting arguments!
-static const char *short_opts = "+GHWVde:fghip:qvx";
+static const char *short_opts = "+GHWVe:fghip:qvx";
 
 // Long options.  See the comments in getopt.h for the meanings of the
 // fields in this structure.