Re: [Wireshark-dev] Unix compiling errors

[Guy Harris]

On Dec 1, 2015, at 7:25 AM, POZUELO Gloria (BCS/PSD)  
wrote:

> I’d like to ask you, how could I fix this error, since I’m working on a 
> Windows environment and this error only appears by compiling for Unix.

It's probably a compiler issue, not an OS issue; if you were using GCC on 
Windows, with the -Werror=c++-compat flag, you'd get the same warning, and if 
you were using a vendor C compiler (Oracle Studio, HP aCC, IBM XL C, etc.), you 
might not get that warning.

> error: request for implicit conversion from ‘void *’ to ‘void **’ not 
> permitted in C++ [-Werror=c++-compat]
> 
>  while (!found && g_hash_table_iter_next(, (gpointer)_info, 
> (gpointer))) {

Yes, as Evan noted, you need a "pointer to a pointer" (gpointer *) as the 
second and third arguments.

> Looking at the Glib reference we can see that g_hash_table_iter_next needs 2 
> gpointer parameters, but it seems to me that this is the cause of the error…. 
> gtp_info is a struct and f is a guint32*.

gtp_info would have to be a *pointer* to a struct, so that _info would be a 
pointer to a pointer, and you'd cast it to "gpointer *" rather than to 
"gpointer".  g_hash_table_iter_next() would set that pointer to point to the 
key of the next entry it finds in the hash table.

I don't know what the values are in your hash table, guint32 or pointer to 
guint32, and the way you'd fix that one would depend on the type.
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Re: [Wireshark-dev] Unix compiling errors

[Evan Huus]

On Tue, Dec 1, 2015 at 10:25 AM, POZUELO Gloria (BCS/PSD)
 wrote:
> Hi all,
>
>
>
> I’d like to ask you, how could I fix this error, since I’m working on a
> Windows environment and this error only appears by compiling for Unix.
>
>
>
> error: request for implicit conversion from ‘void *’ to ‘void **’ not
> permitted in C++ [-Werror=c++-compat]
>
>  while (!found && g_hash_table_iter_next(, (gpointer)_info,
> (gpointer))) {
>
>  ^
>
> Looking at the Glib reference we can see that g_hash_table_iter_next needs 2
> gpointer parameters, but it seems to me that this is the cause of the
> error…. gtp_info is a struct and f is a guint32*.

It expects the second parameter to be a `gpointer *`, but you are only
casting it to a gpointer - you should try `(gpointer *)` for the key
parameter.

> gboolean
>
> g_hash_table_iter_next (GHashTableIter *iter,
>
> gpointer *key,
>
> gpointer *value);
>
>
>
> And finally I have some doubts about this other error:
>
> error: cast to pointer from integer of different size
> [-Werror=int-to-pointer-cast]
>
>  g_slist_foreach(teid_list, (GFunc)teid_loop,
> (gpointer)pinfo->fd->num);
>
>   ^
>
> This can be solve by using GINT_TO_POINTER function?

It should be.

>
> Thank you very much in advance,
>
>
>
> Regards.
>
>
> 
>
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