Re: scons-4.3.0 bug reading scons-3.1.2 generated .sconsign.dblite

There's no (reasonable) way to make the sconsign files be compatible
between py3.5 and p2.7.
The only way to not have invalid (as in crashes scons per your original
email) is to name the sconsign files per python version.
(Which I mentioned in my previous email, and is what the commit you pointed
to).

Of course as you discovered (most likely) you will rebuild items which were
not out of date.

The recommended way is to just validate the new scons & python combination
on your build and then make the switch.

-Bill


On Sun, Mar 20, 2022 at 7:23 PM Jay West <[email protected]> wrote:

> Actually, the workaround isn't sufficient.  We also need to delete all the
> other versions of .sconsign.dblite* as they will be out of date.
>
> Jay
>
>
> On Sun, Mar 20, 2022 at 6:58 PM Jay West <[email protected]> wrote:
>
>> If scons did a full rebuild, it would not be a problem.  The issue is
>> that scons does NOT do a full rebuild, thinking that targets were up to
>> date when they were really not.
>>
>> I see a workaround that someone else took:
>> https://github.com/Autodesk/arnold-usd/pull/116/commits/a404d5f3400437beb4bad561ef1811538f7af022.
>> I will be putting this into our SContruct file.  Can this be made the
>> default behavior?
>>
>> Thanks,
>>
>> Jay
>>
>>
>> On Sat, Mar 19, 2022 at 11:09 AM Bill Deegan <[email protected]>
>> wrote:
>>
>>> Switching from py2.7 -> py 3.5 invalidates the .sconsign files contents.
>>> You have to do a full build when you make that switch.
>>> It's in the release notes somewhere.
>>>
>>> https://scons.org/scons-300-is-available.html
>>>
>>> There's no way around it.
>>> The best you can do is name your SConsign file to include the python
>>> version so at least they won't be invalid when you switch from one to
>>> another, but you will see additional rebuilds which may not be strictly
>>> necessary.
>>>
>>> -Bill
>>>
>>> On Fri, Mar 18, 2022 at 5:03 PM Jay West <[email protected]> wrote:
>>>
>>>> Yes, our scons-3.1.2 was using python-2.7.17, and our scons-4.3.1 is
>>>> using python-3.9.10.  We get a pickling error when trying to run
>>>> scons-3.1.2 after scons-4.3.1 which is good.  Running scons-4.3.1 after
>>>> scons-3.1.2 runs without error, but results in bad builds, which is
>>>> terrible.
>>>>
>>>>
>>>> On Fri, Mar 18, 2022 at 3:04 PM Bill Deegan <[email protected]>
>>>> wrote:
>>>>
>>>>> Sounds like you also switched from python 2.7 to python 3.5 or higher?
>>>>>
>>>>> On Fri, Mar 18, 2022 at 2:07 PM Jay West <[email protected]> wrote:
>>>>>
>>>>>> We are migrating from scons-3.1.2 to scons-4.3.0 and have encountered
>>>>>> incorrect builds.
>>>>>>
>>>>>> After building with scons-3.1.2, changing some files, and then
>>>>>> running scons-4.3.0, it appears that scons-4.3.0 cannot read some
>>>>>> dependencies from the DB file.  Instead of error'ing out or ignoring the DB
>>>>>> file, it happily generates an incorrect build.  However, running:
>>>>>>
>>>>>> sconsign .sconsign.dblite
>>>>>>
>>>>>>
>>>>>> gives
>>>>>>
>>>>>> TypeError: '<' not supported between instances of 'str' and 'bytes'
>>>>>>
>>>>>>
>>>>>> Has anyone seen this issue?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Jay
>>>>>>
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