program_options eats parameter instead of reporting previous one missing an argument

[Adam Nielsen <a.nielsen@…>]

If a parameter is specified with a mandatory argument, but the argument is omitted, the following parameter is used as the argument instead. For example:

  ./test --dump-firmware
  Invalid command line syntax: the required argument for option '--firmware' is missing.  Use --help for help.
  ./test --dump-firmware --help
  dumping firmware to file: --help

Here, --dump-firmware requires an argument, and "--help" is passed in as the argument. Instead, "--help" should be treated as a parameter (either valid or not) and --dump-firmware should report a missing parameter instead.

[Adam Nielsen <a.nielsen@…>]

Example to demonstrate the issue

[anonymous]

Can this bug be fixed? It is rather annoying.