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To: python-list@python.org
From: Ned Deily <nad@acm.org>
Subject: Re: Python 3.4.1 installer on Mac links Python to old Tcl/Tk
Date: Fri, 03 Oct 2014 12:55:24 -0700
References: <locf10$td8$1@ger.gmane.org> <nad-D2DDCB.14070824062014@news.gmane.org> <m0gps5$4r5$1@ger.gmane.org> <nad-40CB03.10344701102014@news.gmane.org> <m0jciu$hoi$1@ger.gmane.org> <mailman.14566.1412287747.18130.python-list@python.org> <m0lhbq$np4$1@dont-email.me>
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In article <m0lhbq$np4$1@dont-email.me>,
 Christian Gollwitzer <auriocus@gmx.de> wrote:
> Hmm, I'm not sure that the other projects would need an update. In Tcl 
> world, there is the concept of stub libraries, an extra level of 
> indirect linking provided by both the Tcl and Tk core. If the extensions 
> link to the stub library (the standard way), they can be loaded into any 
> later version of Tcl and do not directly depend on libtcl or libtk. If 
> the extensions link directly to libtcl, they are either broken or very 
> special (providing one's own interpreter, doing nasty stuff with 
> internals etc.)

Even if there were no incompatibilities, on OS X with Tcl and Tk (and 
other) frameworks, the version number is embedded in the path to the 
shared library and the linker normally creates an absolute path at that.

$ otool -L _tkagg.so
_tkagg.so:
   /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current 
version 60.0.0)
   /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current 
version 1197.1.1)
   /Library/Frameworks/Tcl.framework/Versions/8.5/Tcl (compatibility 
version 8.5.0, current version 8.5.15)
   /Library/Frameworks/Tk.framework/Versions/8.5/Tk (compatibility 
version 8.5.0, current version 8.5.15)

-- 
 Ned Deily,
 nad@acm.org