That's all fine. I have made the changes to  SConstruct for OSX.

But one problem exists, on Python 2.4 in Linux, the dynamic module has to be
called _csnd.so  and not _csnd.pyd. The latter one will not load. I am not sure
what is the 2.5 situation, but for the moment, I have set SConstruct to build
a _csnd.so. This can be easily changed if 2.5 requires a different extension.

Victor



At 17:01 03/05/2007, you wrote:
>Yes, _csnd.pyd "dynamically links" with csnd.dll. The terminology can be 
>confusing, especially because the terminology, and even the technology, 
>are different for different operating systems. Some precise definitions:
>
>Compile - translate symbols to a machine language object file. Addresses 
>that lie outside the compiled object file (external addresses) must be 
>left as symbolic addresses.
>
>Link - combine different object files into one, in the process resolving 
>all external addresses.
>
>Load - load machine language into memory for execution.
>
>Bind - replace all symbolic addresses with actual valid numerical addresses.
>
>Relocate - adjust bound addresses as required for where, in memory, code 
>actually has been loaded (we neglect this here, but it usually happens).
>
>Now the different kinds of linking can be understood.
>
>Static linking - the compiler makes a program out of a number of machine 
>language objects. The operating system can simply load and run the 
>program. Linking and binding have all been done at compile time.
>
>Dynamic linking - the compiler makes a program and one or more shared 
>libraries out of a number of machine language objects. The linker links 
>the program with the shared libraries, but does not bind them. When the 
>operating system loads the program, the program contains instructions put 
>in automatically by the linker that tell the operating system how to load 
>and bind the shared libraries. Linking (resolving external symbolic 
>addresses) happens at compile time. Loading and binding (replacing 
>symbolic addresses with numerical addresses) happen at load time.
>
>Dynamic loading - the compiler makes a program and one or more shared 
>libraries out of a number of machine language objects. The linker does NOT 
>link the program with the shared libraries. The operating system loads and 
>runs the program. The program itself, as instructed by the programmer, 
>loads (e.g. with dlopen) and binds (e.g. with dlsym) the shared libraries. 
>Loading, linking, and binding all happen at run time.
>
>All Python extension modules must be dynamically loaded libraries (hence 
>the "module" term). The Python interpreter itself, when it imports an 
>extension module, loads, links, and binds its dynamically loaded library.
>
>Now for differences between operating systems and compilers.
>
>On Windows, with Visual C++, dynamic linking requires an import library 
>that contains the symbolic addresses for the dynamically linked library. 
>But with MinGW, the linker can link a program directly with a dynamically 
>linked library. Both dynamically linked libraries and dynamically loaded 
>libraries are called "dlls," but a "plugin" is always a dynamically loaded 
>library.
>
>On Unix and Linux, dynamically linked libraries are called "shared 
>libraries", and dynamically loaded libraries are called "modules", and 
>both are also called "shared libraries."
>
>On OS X, a dynamically linked library is called a "dylib" or a "shared 
>library", and a dynamically loaded library is called a "bundle" (if I 
>understand this correctly).
>
>Obviously, "shared library" is a dangerous term because it means one thing 
>on Linux and a slightly different thing on OS X.
>
>So, _csnd.pyd is a dynamically loaded library ("module" on Linux or I 
>suppose it should be a "bundle" on OS X), which is dynamically linked at 
>compile time with the dynamically linked library csnd.dll or csnd.so 
>("shared library" on Linux or I suppose "dylib" on OS X).
>
>The question of course is does this really work on OS X? I should think 
>that it would, but I just haven't done it myself.
>
>Also, please correct me if I got the OS X stuff wrong.
>
>Regards,
>Mike
>
>
>
>
>-----Original Message-----
> >From: Victor Lazzarini 
> >Sent: May 3, 2007 10:57 AM
> >To: csound-devel@lists.sourceforge.net
> >Subject: [Cs-dev] new python code question
> >
> >I have updated my Windows CVS and built the python module; I tested it
> >and it loads.
> >
> >I am just a little confused, because I thought that _csnd.pyd
> >was supposed to load csnd.dll, but as far as I can see in SConstruct, it
> >is actually linked to it:
> >
> >csndPythonEnvironment.Append(LIBS = ['csnd'])
> >
> >I am just thinking ahead now to OSX. This would of course be OK, but
> >I thought your idea was to have _csnd.pyd loading csnd.dll. I  can't see
> >the code that does that, so I am supposing it's not how it's going to be
> >done.
> >
> >Could clear that up?
> >
> >Victor
> >Victor Lazzarini
> >Music Technology Laboratory
> >Music Department
> >National University of Ireland, Maynooth
> >
> >
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Victor Lazzarini
Music Technology Laboratory
Music Department
National University of Ireland, Maynooth


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