Re: drop support for Python 2.3

On 2/7/17 10:49 PM, Tom Lane wrote:
> Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> writes:
>> I would like to propose that we drop support for Python 2.3.
>> ...
>> We do have buildfarm coverage on prairiedog. However, that runs a >10
>> year old operating system, so I think it is not representing real usage.
> I have no particular objection to dropping 2.3 support, but should we
> make some effort to fail gracefully (ie, with a relevant error message)
> on older versions? I would guess that the effect of your patch will be
> to produce quite opaque failures. We seem to be computing python_version
> in configure, so it shouldn't be that hard to check.

Except AFAIK that won't protect the user if something on the OS changes
and backends suddenly start loading a 2.3 library, though I guess pl/tcl
suffers the same problem.

BTW, the easy way to check this (at least with cypthon) would be
PY_VERSION_HEX >= 0x02040000

(from cpython/include/patchlevel.h)
/* Version as a single 4-byte hex number, e.g. 0x010502B2 == 1.5.2b2.
Use this for numeric comparisons, e.g. #if PY_VERSION_HEX >= ... */
#define PY_VERSION_HEX ((PY_MAJOR_VERSION << 24) | \
(PY_MINOR_VERSION << 16) | \
(PY_MICRO_VERSION << 8) | \
(PY_RELEASE_LEVEL << 4) | \
(PY_RELEASE_SERIAL << 0))
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