[PD] compiling example extern

[Greg Rippin]

Hi everyone,

Making progress on this. . . I see in the m_pd.h file how the #ifdef looks to see
if it's being compiled in C++, and if so wraps it in "extern C{}".  I'm still
having linking errors, trying to build the "foo1" example (a bunch of unresolved
external symbols, all of which are defined in  m_pd.h.  This occurs even if I
wrap the foo1.c code.  My attention is drawn to a later #ifdef, which
conditionally redefines the external storage class "extern" if you are using NT;
would the fact that I am using Win98 and not NT keep this #ifdef from being
executed properly?

One last thing. . . In the pd documentation on externs, it says "To compile, type
"make pd_linux", "nmake pd_nt", "make pd_irix5" or "make pd_irix6"."  What is
this referring to (in other words, where do I type "make pd_nt")?

Thanks again for all the help.

Greg

Karl MacMillan wrote:

> On Saturday 03 November 2001 01:09 pm, Greg Rippin wrote:
> > Hello everyone,
> >
> > I'm getting into creating pd externals on Win98 using visual C++ 6.0.
> > I've started with the howto paper on the IEM site, and I'm having
> > trouble building the first "hello world" example.  I receive terror
> > C2664: 'class_new' : cannot convert parameter 6 from 'const int' to
> > 't_atomtype'.  I believe this is referring to the "0" that terminates
> > the list of object arguments.
> >
> > I suspect that I may have to change the code (originally for Linux, I
> > think) a bit to compile correctly on windows. .. Can anyone suggest
> > anywhere to start?
> >
>
> I think this is a C++ issue, not a windows issue. If you can make VC++
> compile this as plain C your problems should go away. Otherwise you are going
> to have to place some explicit casts in the code and wrap your function
> prototypes in "extern C { }" to make them use C linkage. For more information
> about the latter you can look at the Gem externals or ask on the list. Unless
> you are going to use C++ features, it is probably not worth the trouble,
> though.
>
> Karl
>
> > Thanks,
> > Greg

--
Greg Rippin, Graduate Assistant
Music Technology Program
New York University
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New York, NY 10012

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