[Gdal-dev] ng-python build

[William Kyngesburye]

On Oct 11, 2007, at 11:34 PM, Howard Butler wrote:

> On Oct 11, 2007, at 10:55 PM, William Kyngesburye wrote:
>
>> As I worked on some OSX framework build issues, I noticed a couple  
>> odd ng-python build items.
>>
>> - After configuring to build ng-python, make doesn't build *any*  
>> python bindings.  It looks like the makefile default target  
>> doesn't refer to the swig-target, just the old py-target.  BUT,  
>> install does - the install-actions target runs a make install in  
>> the swig dir, which ends up building ng-python.
>
> I think this was because of libtool and linking trouble with -lgdal  
> as it is built in the tree.  I think Kevin was the one who  
> originally did the target for the ng bindings.  I have always built  
> them by hand, but I am expecting to deal with these issues before  
> the 1.5 release.  Can you please file a ticket for this one and  
> pick the PythonBindings as the component?
>
It seems to work now.  That is, if I run make swig-target.  There are  
warnings that the installed gdal can't be found, but then OSX has the  
dynamic-lookup link option, so maybe it's an error on other  
platforms.  Is this what you mean?  Of course, when it gets run on  
install, gdal is installed by the time ng-python is built.

>>
>> - ng-python installs in $prefix.  This ends up being installed  
>> where-ever GDAL is installed, in the subdir thereof specified in  
>> the python distutils (something like lib/python2.5/site- 
>> packages).  Is this intentional?  Shouldn't it be left completely  
>> up to distutils so it gets installed in the default python site- 
>> packages dir?
>>
>
> This is what the old bindings did as well, which is why it  
> currently does this by default.  However, with the ng bindings, the  
> situation is more inconsistent than that:
>
Are you sure?  The old python has always installed in python's site- 
packages for me.  INST_PYMOD in gdalmake.opt is set from pymoddir in  
configure, which it correctly calculates from python.


> -- If setuptools is installed, use that to build and do "install -- 
> root / --single-version-externally-managed".  By default this means  
> an egg file gets put in your Python path (typically site-packages)
> -- If setuptools is not installed, install in --prefix as before.
>
> What makes the most sense for installation and building of the  
> Python bindings?  There are so many different ways to skin this cat  
> now that we are using setuptools/distutils by default.  I'd like  
> everyone to chime in who has an opinion.  I think putting stuff in  
> --prefix by default is confusing for most folks, but installing  
> stuff in the root of your Python install isn't too friendly either...
>
> As things are currently defined, setuptools is used *by default* if  
> configure or setup.py determines that it is available. Regular  
> distutils is then used if setuptools isn't available.  I would hate  
> to *require* setuptools, but it would simplify troubleshooting  
> things.  Our default install: targets basically install the  
> bindings the same way regardless of whether or not setuptools is  
> available, and the major benefit is if you want to hand build  
> things, you have a lot more options.
>
Coming from a (my) Mac viewpoint, I don't think setuptools is all  
that common on OSX.  I think the python root site-packages is where  
most everyone installs extensions on OSX.


> My opinions:
> -- I really like setuptools for the 'develop' target and even for  
> eggs now that we use them on the osx buildbot slave (everything is  
> self-contained and it doesn't end up polluting the rest of my  
> machine with new and possibly broken bindings and we don't have to  
> do sys.path hacking). I can see providing the ng bindings as eggs  
> for windows, for example.

On OSX, Installer packages are the thing.  I haven't been paying a  
whole lot of attention to the mac python list, but there may be an  
installer packaging option in distutils.  I can look into it.


-----
William Kyngesburye <kyngchaos*at*kyngchaos*dot*com>
http://www.kyngchaos.com/

First Pogril: Why is life like sticking your head in a bucket filled  
with hyena offal?
Second Pogril: I don't know.  Why IS life like sticking your head in  
a bucket filled with hyena offal?
First Pogril: I don't know either.  Wretched, isn't it?

-HitchHiker's Guide to the Galaxy