Bug#377964: [Build-common-hackers] Bug#377964: cdbs should use the unversioned interpreter for the default python version

[Peter Eisentraut]

Matthias Klose wrote:
> the interpreter is used by installation scripts to set the
> interpreter name in scripts, leading to hash lines
> /usr/bin/python2.3, which dh_python then turns into a python2.3
> dependency. Please call the unversioned interpreter for the default
> python version.

I have implemented a fix for this -- see attached patch -- but it breaks 
the python-numpy build, which you nominated as example, so I'm unsure 
what to do.

On further consideration, I think packages that rely on this behavior 
either way are in error.  The policy says that if programs can run with 
any version, they must use /usr/bin/python as interpreter, so this must 
be a fixed value, no matter how the build script is called or whether 
the version being used for building is the default one at build time.  
If, on the other hand, a program really needs a specific version 
because of the way it is written, that version should be hard-wired 
into the program, no matter what version you use to run the build 
script.
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