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Month: February 2014

Re: [trinity-devel] kdeutils FTBFS - error: 'PyString_CheckExact' was not declared in this scope

From: "David C. Rankin" <drankinatty@...>
Date: Sun, 09 Feb 2014 15:11:28 -0600
On 02/09/2014 07:27 AM, E. Liddell wrote:
> On Sun, 09 Feb 2014 00:22:30 -0600
> "David C. Rankin" <drankinatty@...> wrote:
>> On 02/08/2014 11:38 PM, Darrell Anderson wrote:
>>> I have Python 2.7 installed. The Python.h header file has a bunch 
>>> of other header file includes, one of which PyString_CheckExact is 
>>> defined.
>>> Perhaps look into where PyString_CheckExact is defined in your 
>>> version of Python. My guess is your version of Python.h no longer 
>>> contains an include where PyString_CheckExact is defined or perhaps 
>>> PyString_CheckExact has been replaced by a different function.
>> Your guesses are pretty 'spot-on' normally. Arch has python 3.3.3, but also
>> includes python 2.7.6 as 'python2'. We should be able to patch the superkaramba
>> cmake file to call python2 instead of python which should solve the problem.
> A lot of things about string handling changed between Python 2 and Python 3,
> and the problems associated with this are one of the main reasons Python 2
> is still a going concern.  For practical purposes, it's easiest to treat the two as
> separate languages, rather than as two versions of the same language,
> because most code is surprisingly difficult to transfer.
> E. Liddell

Yes, I understand what happened, and I've been slowly working through a python
fix that will work for python2 and python3. Basically following Darrell's
grocery store manager analogy, python moved everything from isle PyString_foo to
isle PyBytes_foo and broke all customer expectation of where to find them.
However, being a good little grocery store manager, python left a little sign on
PyString_'s isle, in an ad named bytesobject.h that tells customers:

bytesobject.h:11:#define PyBytes_FromStringAndSize PyString_FromStringAndSize
bytesobject.h:12:#define PyBytes_FromString PyString_FromString

So that when customers move to the new isle to shop, they will still be able to
checkout just as they always have. However, moving to the new isle to find
PyString_ is a difficult matter with all sorts of mops, brooms, spills and
cleanups blocking the way.

But there appears another option. It seems that the manager, cmake, holds the
key to allow customers to continue to shop on the old PyString_ isle by simply
changing the checkout from /usr/bin/python to /usr/bin/python2, but as with most
managers, the key is misplaced somewhere in the bowels of the storeroom in a box
labeled autotools or maybe cmake, but the manager cannot be sure as his memory
is clouded by many many trips to the checkout line since he last recalls seeing
the key....

David C. Rankin, J.D.,P.E.