[gtk-osx-users] Gotcha building python 2.6 using setup_sdk 10.6

[Richard Procter <richard n procter gmail com>]

Hi all, 

I found a gotcha when building python 2.6.8 with the latest gtk-osx build 
scripts yesterday on 10.6[1] when the resultant binary surprised me by 
displaying: 

> Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) 
> [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> > > >


The only thing I had changed from the stock script was: 

> setup_sdk(target="10.6", sdk_version="10.6", architectures=["i386"])

(setting _gtk_osx_use_jhbuild_python = True had no effect).

Looking at .jhbuildrc, a non-native setup_sdk sets a bunch of compiler flags, 
one being:

> environ_prepend("LDFLAGS", "-L" + "/Developer/SDKs/MacOSX10.6.sdk" + "/usr/lib")

, which when added to the stock .jhbuildrc-custom is sufficient to cause the problem. 

Digging deeper, yes, this causes the python binary to reference the 10.6 SDK python library.[2] 

I suspect this is ultimately an issue with python's build system giving LDFLAGS too 
high priority. My workaround is to build python 2.7 instead, which doesn't exist on 10.6.

best, 
Richard. 

[1]
$ <fresh checkout of gtk-osx> 
$ jhbuild build python 

[2] 
without LDFLAGS: 
$ otool -L `which python` 
gtk/inst/bin/python:
        /Users/rix/work/doview/development/osx/gtk-osx/test/gtk/inst/lib/libpython2.6.dylib (compatibility 
version 2.6.0, current version 2.6.0) <-- OK
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.11)
        /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 
150.0.0, current version 550.44.0)

with LDFLAGS: 
$ otool -L `which python`
/Users/rix/work/doview/development/osx/gtk-osx/test/gtk/inst/bin/python:
        /System/Library/Frameworks/Python.framework/Versions/2.6/Python (compatibility version 2.6.0, current 
version 2.6.1) <--- System SDK!
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.0)
        /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 
150.0.0, current version 550.44.0)