[Pythonmac-SIG] Using distutils with XCode

[Paul Kinnane]

Thanks for this Chris.

I have now got the library compiled and working in Dawrin python.  I
simply compiled and linked with g++ instead of gcc (I did this by
manually entering the compile and link commands that setup.py was
issuing, changing "gcc" to "g++').  The resulting file is ode.so, and
after doing an "install" I can "import ode" and use the library.  The
"Loaded module does not contain symbol _initode2" error was due to me
renaming the ode.so library - which appears to be a no-no.

However, back to the original question....

I want to use the library in MacPython (rather than Darwin python).
MacPython requires a slb library.  Simply renaming ode.so to ode.slb
results in a "fragment container format is unknown" error when I do an
"import ode" in the MacPython IDE.

Is there a way to compile the library to a .slb using gcc?

Thanks

Paul

-----Original Message-----
From: Chris Barker [mailto:Chris.Barker at noaa.gov] 
Sent: Thursday, 6 October 2005 2:06 AM
To: Paul Kinnane
Cc: pythonmac-sig at python.org
Subject: Re: [Pythonmac-SIG] Using distutils with XCode

Paul,

I don't really have much more to offer here. As I mentioned, I ran into 
a similar problem a while back, but never really solved it...I just 
converted my C++ code to C. I'm hoping someone that really knows what 
they are doing could help.

In the meantime, one thing to try is to look for an extension written in

C++ that does build with setup.py, and see how it is done. Matplotlib 
comes top mind, though that's a pretty complex one.

Paul Kinnane wrote:
>>I doubt it. It is in libstdc++
> 
> Well I couldn't find any trace of a file called "libstdc*" on my Mac,
so
> maybe it isn't installed?

Weird. On my machine (10.3.?) it's in:

/usr/lib/

It's also in:
/usr/lib/gcc/darwin/3.1
and
/usr/lib/gcc/darwin/3.3

and a couple other places. some of these may be links to others. gcc3.3 
is now my system compiler.

> So I replaced the gcc link command with g++, and now when I do "import
> ode" in python I get...
> 	ImportError: Loaded module does not contain symbol _initode2
> 
> Which seems to indicate a problem with the ODE build.

yes, it does look like that. Is there an 'extern "C" ' before the 
_initode2() definition?

Is there an _initode2() defined?

Sorry I can't be more help,

-Chris


-- 
Christopher Barker, Ph.D.
Oceanographer
                                     		
NOAA/OR&R/HAZMAT         (206) 526-6959   voice
7600 Sand Point Way NE   (206) 526-6329   fax
Seattle, WA  98115       (206) 526-6317   main reception

Chris.Barker at noaa.gov