[Pythonmac-SIG] 64 bit python on G5 Mac OS X

[Ronald Oussoren]

On 22 Jun, 2007, at 18:31, Phil Hystad wrote:

> Is there a 64 bit version of Python for a dual-G5 running Mac OS X  
> (Tiger)?

I posted about this a while back, with a (rather hackish) procedure  
to get it to compile:

<quote>
The build is universal, but for me only one of the two archictures
actually worked: I did my build on an Intel system and the 64-bit
build worked on that machine, but didn't work on a G5 mac. That's
probably something shallow, but as that machine doesn't have the
Xcode installed and is on the other side of a slow network connection
I haven't tried to debug this yet.

1) Edit the configure script, look for "-arch i386" and "-arch ppc"
and change that those to  "-arch ppc64" and "-arch x86_64". You'll
have to make multiple changes to the configure file.

2) Build using:

        $ mkdir build
        $ cd build
        $ CFLAGS="-arch ppc64 -arch x86_64" ../configure \
            --enable-universalsdk \
            --disable-toolbox-glue --prefix=/opt/python25-64bit
        $ make
        $ make install

3) Optionally: run "make testall" to run the unittests and check
pyconfig.h to check the various SIZEOF definitions.

You now have a 64-bit build of python in /opt/python25-64bit.

</quote>

The resulting binary is 2-way universal, but will actually only work  
correctly on the architecture where you did the build (that is, if  
you run the build on a PPC64 system the binary won't work correctly  
on x86-64 and v.v.).  I'm pretty sure this is a shallow problem,  
caused by differences in vararg handling that are detected by the  
configure script.

Note that these instructions will give you an incomplete  
installation, a number of extensions in the standard library won't be  
build because they use a C library that is not available in 64-bit  
mode. If you want to use those libraries (openssl, zlib, bz2 and  
possibly others as well) you have to build the required C libraries  
in 64-bit mode as well.

And a final note: you can probably get the same effect by supplying  
the right OPT, CFLAGS and LDFLAGS arguments to configure instead of  
editing the configure script. I used the procedure mentioned earlier  
because I hoped to get a universal build as the development and test  
systems I was using at the time had different architectures (a  
macbook pro vs. a G5 xserve).

Ronald

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