[Scons-dev] scons trunk is broken..

[anatoly techtonik]

On Sun, Apr 27, 2014 at 8:08 PM, Gary Oberbrunner <garyo at oberbrunner.com> wrote:

> On Sun, Apr 27, 2014 at 12:54 PM, anatoly techtonik <techtonik at gmail.com>

> wrote:

>>

>> I expect a big problem to be cross-python SConstructs. Do we have any

>> instructions how to write these?

>

>

> I'm not all that concerned about this.  Most people will write SConscripts

> for the python version they're using, whether it's 2 or 3.  So those people

> won't care at all.


Most people write just for "scons" to work. Depending on what this `scons`
uses, it may execute SConscript with Python 2 and Python 3, and if
SConscript is written for specific Python version, it may fail.


> When the 2 users port to 3, they'll have more problems

> than just their SConscripts to worry about; probably the SConscript changes

> will be small compared to their other changes.


There are many projects that use Python just for SCons build system (or
derivative of build system based on SCons).


> And of course if people use

> python3 features in their SConscripts, python2 users won't be able to use

> them. Sure, there will be some things to keep in mind like unicode string

> handling and print functions, but I bet a large majority of simple

> SConscripts will "just work" or at least a simple 2to3 run will get them

> close.


Did you test that? There is Blender and Wesnoth that can be immediately
affected and easy to use. Unfortunately, I can't test them right now.


> If we can create instructions like you're talking about, things to do or

> things to avoid, and put those on the wiki, that would be excellent.  We'll

> probably have to have some experience before we can do that well though.


I just want to make sure that when people hit problems, there is already
a page to document the problem. It may happen that we will need to
introduce shebang header and parse it manually before inclusion to warn
users that the SConstruct was designed with another Python version in
mind and that they should expect failures.
-- 
anatoly t.