[PD-dev] compile pd with cygwin

[Martin Peach]

Patrice Colet wrote:
> Hello!
>
>   I've added -mno-cygwin and -I/cygdrive/c/Mingw/include 
> -L/cygdrive/c/Mingw/lib because:
>
> 1° The __WIN32 flag doesn't work with cygwin
> 2° there is a cruel conflict with errno.h cygwin version.
>
> So it's not possible to compile with cygwin without mingw, unless using 
>   voodoo...
>   
Well it seems like the Windows API that mingw provides is essential for 
the audio and midi interfaces, unless you have a precompiled portmidi 
and portaudio. The rest could be done in cygwin's pseudo-unix, probably 
not GEM though. I think if there was a tcl/tk for cygwin it would be 
even more compatible with the unix version.
...
> cc -g -O2 -DPD  -Wall -W -Wstrict-prototypes -Wno-unused 
> -Wno-parentheses -Wno-s
> witch  -mno-cygwin -DUSEAPI_PORTAUDIO  -DPA_LITTLE_ENDIAN -DPA19 
> -I/cygdr
> ive/c/Mingw/include -L/cygdrive/c/Mingw/lib     -I../portaudio/pa_common 
> -I../po
> rtaudio/pablio  -I../portaudio/pa_asio  -I../portmidi/pm_common 
> -I../portmidi/po
> rttime  -I../portmidi/pm_win -I../portmidi/pm_win_ds     -mms-bitfields 
>   -DINSTA
> LL_PREFIX=\"/usr/local\"  -c -o ../obj/g_canvas.o g_canvas.c
> g_canvas.c:58: erreur: un 'el'ement de l'initialisation n'est pas une 
> constante
> g_canvas.c:59: erreur: un 'el'ement de l'initialisation n'est pas une 
> constante
>   
Line 58:
static t_symbol *canvas_newfilename = &s_;

Probably the compiler doesn't like this because _s is declared EXTERN 
which is configured for MSW instead of just extern.

> g_canvas.c:574: attention : << canvas_makebindsym >> d'efini localement 
> apr`es a
> voir 'et'e r'ef'erenc'e avec lien dllimport.
>   

It was prototyped in g_canvas.h as EXTERN t_symbol 
*canvas_makebindsym(t_symbol *s);
In m_pd.h EXTERN is defined as:
#ifdef MSW
#ifdef PD_INTERNAL
#define EXTERN __declspec(dllexport) extern
#else
#define EXTERN __declspec(dllimport) extern
#endif /* PD_INTERNAL */
#else
#define EXTERN extern
#endif /* MSW */
so you probably need to avoid using MSW here for cygwin because the 
__declspec stuff only works with MSVC. The extern things must be 
accessible from outside the pd dll so you need to export the symbols 
somehow.
...

> ==========================================================================
>
> I have to give up for the moment, even if I've just replaced MSW with 
> __WIN32 and added a few lines of codes to configure.in and makefile.in, 
> it took me too much time for no satisfying results.
>
>   
Oh, too bad... I tried it a couple years ago as well and didn't get it 
to work either, but I learned a lot about the insides of pd;).

Martin