Actually, I think we could streamline this process with a new API function: https://github.com/pure-data/pure-data/issues/2075

To avoid bleeding-edge red, is the following not possible with externals?

This would work in a way that you could compile ELSE for older Pd versions. But then you would essentially need to ship two different versions: one for Pd 0.54> and another one for Pd 0.54<=.

Ideally, there should be one version that works for both older and newer Pd versions. A simple runtime check is not enough because multichannel objects need to call a new API function, namely signal_setmultiout(). Any external that calls this function would refuse to load with older Pd versions that do not have this symbol.

Now, what you can do is try to load signal_setmultiout() explicitly with dlsym resp. GetProcAddress:

typedef void (*signal_setmultiout_fn)(t_signal **, int);
signal_setmultiout_fn my_signal_setmultiout;

// in setup function:
#ifdef _WIN32
my_signal_setmultiout = (signal_setmultiout_fn)GetProcAddress(GetModuleHandle(NULL), "signal_setmultiout");
#else
my_signal_setmultiout = (signal_setmultiout_fn)dlsym(dlopen(NULL, RTLD_NOW), "signal_setmultiout");
#endif

// in DSP method:
if (my_signal_setmultiout) // Pd has multichannel support
    ...
else // no multichannel support
    ...

That's what I am planning to do for vstplugin~ and aoo.

Christof

On 04.08.2023 20:31, Dan Wilcox wrote:

To avoid bleeding-edge red, is the following not possible with externals?

#ifdef PD_MAJOR_VERSION >= 0 and PD_MINOR_VERSION >= 54

// multichannel code

#else

// non-multichannel code

#endif

Depending upon the code layout, you could also probably use some macros for lots of redundant stuff.

On Aug 4, 2023, at 8:18 AM, pd-list-request@lists.iem.at wrote:

Message: 3
Date: Fri, 4 Aug 2023 03:12:27 -0300
From: Alexandre Torres Porres <porres@gmail.com>
To: Pd-List <pd-list@lists.iem.at>
Subject: Re: [PD] Building ELSE for Pd Vanilla (here RPi OS 11 32-bit)
Message-ID:
<CAEAsFmj2J+BAF3djDfUDeyaFtUjPXcFkRFiZn6fpAob06Ha5Vw@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"

Em qui., 3 de ago. de 2023 ?s 16:46, IOhannes m zm?lnig <zmoelnig@iem.at>
escreveu:

Personally I think this is a bug in ELSE, and would file a bug that it
ought to be buildable against older versions of Pd (even if that means
that some functionality is missing).

I'm creating new objects for multichannel fun and adding multichannel
awareness to old objects, right now there are over 50 signal objects that
are multichannel aware (and counting).

Without 0.54 you'll just have many errors trying to deal with
CLASSMULTICHANNEL

So yup, 0.54 is needed. Sorry I'm always on the bleeding edge

--------

Dan Wilcox

@danomatika

danomatika.com

robotcowboy.com

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