[PD] pd external build problem

[Christof Ressi]

Hi,

this is a known issue with recent GCC versions. Just don't compile with 
"-Werror" or disable the warning with "-Wno-cast-function-type".

Did you enable "-Werror" yourself? Generally, it's not a good idea to 
enable "-Werror" by default in your build system because new compiler 
versions tend to introduce new warnings which in turn may break the 
build process.

Christof

On 17.09.2023 15:33, ub wrote:
> hey list,
>
>
> i was trying to compile a pd-external which i made some time ago and 
> found that gcc issues a warning – turned into an error – regarding the 
> type of t_newmethod.
>
>  error: cast between incompatible function types from ‘void * 
> (*)(t_symbol *, int,  t_atom *)’ {aka ‘void * (*)(struct _symbol *, 
> int,  struct _atom *)’} to ‘void * (*)(void)’ 
> [-Werror=cast-function-type]
>   478 |          (t_newmethod) zmq_new,
>
> now i checked with the external howto on github and couldn't find 
> anything wrong with the code.
>
> the way i understand it, the type should be void * (*)(void) if i 
> would not declare an inlet. since i do declare inlets with A_GIMME, it 
> is my understanding that the function type of t_newmethod should be 
> void * (*)(t_symbol *, int,  t_atom *)
>
> the external loads and seems to run fine, when built without -Werror.
>
> maybe someone can help me fix this.
>
>
> my class constructor is declared as:
>
> static void *zmq_new(t_symbol *s, int argc, t_atom *argv)
>
>
> and it's called in class_new like this:
>
>      zmq_class = class_new(gensym("zmq"),
>            (t_newmethod) zmq_new,
>            (t_method) zmq_destroy,
>            sizeof(t_zmq),
>            CLASS_DEFAULT, A_GIMME, 0);
>
>
> the entire code is available at:
>
> https://github.com/sansculotte/pd-zmq
>
>
> thanks a lot,
>
> ub
>
>
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