[Differential] [Request, 278 lines] D3804: Restore compile-time support for Python 3.5

[flherne (Francis Herne)]

flherne created this revision.
flherne added a reviewer: brauch.
flherne set the repository for this revision to R53 KDevelop: Python Support.
Restricted Application added a subscriber: kdevelop-devel.

REVISION SUMMARY
  (against the python36 branch, obviously)
  
  Python 3.5 is default on Ubuntu 16.04 LTS and 16.10, Mint 18 and other commonly-used distros, we probably shouldn't drop it yet.
  
  AST nodes in 3.6 seem to be a superset of those in 3.5, and no other changes (discovered so far?) affect kdev-python. Simply skipping the generating code for new AST types will allow compilation against 3.5.
  
  Add a new `SINCE` directive in python36.sdef, e.g. `SINCE 3.6`, and make conversionGenerator.py emit #if checks for affected statements.
  
  This can't be used with `CODE`, because that wasn't needed yet. (:P)
  
  The bundled `FindPython` CMake module doesn't handle multiple Python versions. Instead use `FindPythonInterp` and `FindPythonLibs` from upstream CMake, which (without EXACT) will find newer versions than the one requested; the existing check ensures the version isn't too new.

TEST PLAN
  Compiled against Python 3.5, it builds and seems to work fine.
  
  Didn't actually try 3.6 yet, I don't have it...

REPOSITORY
  R53 KDevelop: Python Support

REVISION DETAIL
  https://phabricator.kde.org/D3804

AFFECTED FILES
  CMakeLists.txt
  cmake/modules/FindPython.cmake
  cmake/modules/README-FindPython
  duchain/helpers.cpp
  kdevpythonversion.h.cmake
  parser/conversionGenerator.py
  parser/generated.h
  parser/python36.sdef

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: flherne, brauch
Cc: kdevelop-devel
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