Re: [PATCH] parse-options: detect attempt to add a duplicate short option name

>> Not quite, as an opt with long name is reported with the long name
>> only, which is not very nice when the problem we are reporting is
>> about its short variant.
>
> Perhaps something like the patch below helps, here and in general?

>  parse-options.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/parse-options.c b/parse-options.c
> index b7925c5..f1c0b5d 100644
> --- a/parse-options.c
> +++ b/parse-options.c
> @@ -14,8 +14,12 @@ static int parse_options_usage(struct parse_opt_ctx_t *ctx,
>  
>  int optbug(const struct option *opt, const char *reason)
>  {
> -	if (opt->long_name)
> +	if (opt->long_name) {
> +		if (opt->short_name)
> +			return error("BUG: switch '%c' (--%s) %s",
> +				     opt->short_name, opt->long_name, reason);
>  		return error("BUG: option '%s' %s", opt->long_name, reason);
> +	}
>  	return error("BUG: switch '%c' %s", opt->short_name, reason);
>  }