[SciPy-user] Trying to build scipy 32-bit on a 64-bit machine

David Cournapeau david@ar.media.kyoto-u.ac...
Tue Feb 26 06:01:29 CST 2008

Jeremy Mayes wrote:
> Hi,
> I'm trying to build scipy for a target of i686 ( i.e., 32-bit ) but on 
> an x86_64 host using gcc/4.1.1.  I've been struggling with this and 
> haven't seen any reference in the archives ( I apologize if I missed it ).

It won't be easy: distutils (the python package used to build numpy) 
does not support cross-compiling. Already cross-compiling python itself 
is difficult, and you will need that first.

> I've been trying to set CFLAGS and LDFLAGS to pass -m32, but, I get 
> undefined symbol errors ( MAIN__ ).  If I just let it run, then, I get 
> errors with LONG_BIT defined in pyport.h ( python successfully build 
> 32-bit ).

Modifying flags will not work. Different architectures have different 
python installations (different headers, with different values: that's 
certainly the cause of the above error). Do you have any experience 
cross-compiling ? Because cross-compilation is already difficult, and 
python is not an easy package to cross-compile (bootstrapping issues, 
etc...), specially since the installation process of python does not 
support cross-compilation (you can find patches, but I don't know if 
they are updated for recent python).



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