I get this with GCC 5.2.0:

/home/rb743/dev/freebsd-riscv/lib/libdpv/dialog_util.c:270:23: error: 
zero-length gnu_printf format string [-Werror=for
mat-zero-length]
   sprintf(dargv[n++], "");

Ruslan

On Wed, Jan 27, 2016 at 06:21:35AM +0000, Devin Teske wrote:
> Author: dteske
> Date: Wed Jan 27 06:21:35 2016
> New Revision: 294893
> URL: https://svnweb.freebsd.org/changeset/base/294893
> 
> Log:
>   Fix a crash if `-D' is used without `-t title'
>   
>   dialog(3)'s dlg_reallocate_gauge(), used both by dialog(3)'s dialog_gauge()
>   and dialog(1)'s `--gauge', will segmentation fault in strlen(3) if no title
>   is set for the widget. Reproducible with `dialog --gauge hi 6 20' (adding
>   `--title ""' is enough to prevent segmentation fault).
>   
>   MFC after:  3 days
>   X-MFC-to:   stable/10
> 
> Modified:
>   head/lib/libdpv/dialog_util.c
> 
> Modified: head/lib/libdpv/dialog_util.c
> ==============================================================================
> --- head/lib/libdpv/dialog_util.c     Wed Jan 27 06:16:53 2016        
> (r294892)
> +++ head/lib/libdpv/dialog_util.c     Wed Jan 27 06:21:35 2016        
> (r294893)
> @@ -261,6 +261,13 @@ dialog_spawn_gauge(char *init_prompt, pi
>                       errx(EXIT_FAILURE, "Out of memory?!");
>               sprintf(dargv[n++], "--title");
>               dargv[n++] = title;
> +     } else {
> +             if ((dargv[n] = malloc(8)) == NULL)
> +                     errx(EXIT_FAILURE, "Out of memory?!");
> +             sprintf(dargv[n++], "--title");
> +             if ((dargv[n] = malloc(8)) == NULL)
> +                     errx(EXIT_FAILURE, "Out of memory?!");
> +             sprintf(dargv[n++], "");
>       }
>       if (backtitle != NULL) {
>               if ((dargv[n] = malloc(12)) == NULL)
> 

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