Re: [gentoo-alt] On Python and OSX

[Pavel Volkovitskiy]

On Mon, Sep 14, 2009 at 16:52, Fabian Groffen <grobian@g.o> wrote:

> This message is mainly for Mac OS X users, if you're not one of them,
> you can probably just skim or even ignore this message.
>
> Over the last few weeks I've been messing/fighting with Python for the
> "aqua" USE-flag that I added to it.  Enabling this flag causes a
> framework build of Python to be made.  This actually results in a
> Mach/Next-style installation hierarchy, referred to as a Framework.  On
> OSX these are used and typically found in /Library/Frameworks.
>
> The changes I've made are as follows.  First, because we need the
> framework and since we don't want many more frameworks, I decided to
> install the framework in a non-standard location, which better suits our
> UNIX-layout: $EPREFIX/usr/lib/Python.framework.  This in contrast to
> $EPREFIX/Library/Frameworks/Python.framework.  Using the former part, we
> hide the framework thing a bit, by partially swiping it under the carpet.
>

First of all, thanks for you hard work on that!

next on the issue i hit

i tried to emerge subversion with python bindings and it now builds(*)

but if you tries to actually use it you will get python fatal error:
$ hg convert 'svn://overlays.gentoo.org/proj/alt/trunk/prefix-overlay'
/opt/gentoo-portage-mirror/
Fatal Python error: Interpreter not initialized (version mismatch?)
Abort trap

it seems that something built against different pythons

otool -L /opt/gentoo/usr/lib/python2.6/site-packages/libsvn/_ra.bundle:
<skip>
/System/Library/Frameworks/Python.framework/Versions/2.6/Python
(compatibility version 2.6.0, current version 2.6.1)

^^^ what's wrong

so i tried to find out why it linked to system's python instead of our one

during subversion's python bindings build right args passed to linker
"-F/opt/gentoo/usr/lib -framework Python" but ld skips that and uses system
one

from man ld:
     -framework name[,suffix]
                 This option tells the linker to search for
‘name.framework/name’ the framework search path.

so it looks for "/opt/gentoo/usr/lib/Python.framework/Python" but there is
no such file

$ file /System/Library/Frameworks/Python.framework/Python
/System/Library/Frameworks/Python.framework/Python: symbolic link to
`Versions/Current/Python'

i added /opt/gentoo/usr/lib/Python.framework/Python: symbolic link to
`Versions/2.6/Python'

and rebuild subversion and mercurial

now it builds against our python, what's good

but still doesn't work

i'm trying to find out other issues

(*) subversion ebuild missed "\" in
emake -j1 DESTDIR="${D}" \
                swig_pydir="${EPREFIX}$(python_get_sitedir)/libsvn"
swig_pydir_extra="${EPREFIX}$(python_get_sitedir)/svn"
                install-swig-py \
                        || die "Installation of Subversion SWIG Python
bindings failed"

(or maybe that's on "swig-py" can't check right now)

-- 
Pavel