[Scons-users] Weird problem in MS Windows

[Bill Deegan]

Albert,

SCons 3.0.0 does not require python 3.0. It is compatible with python 2.7.x
and 3.5+
(though it requires changing print's to print()'s (until 3.0.1 is released
any day now))

Are you using visual c++/visual studio to build your project?
(If not you could remove that from the list of tools being initialized, and
then see if another tool fails the same way)

Are you using the DefaultEnvironment() on purpose?
(Via builders not attache to an Environment() such as Program() instead of
env.Program())

-Bill



On Mon, Oct 30, 2017 at 11:46 PM, Albert Arquer <albert.arquer at gmail.com>
wrote:

> No easily...
> All my sconscripts are in python 2.x. As I said this problem is
> intermittent, so it is not just testing it once, it would mean using it for
> a long time....
>
> Also, without identifying the underlying problem... how will we know if it
> is actually fixed? Sometimes this error does not appear for weeks.
>
> 2017-10-31 3:37 GMT+01:00 Bill Deegan <bill at baddogconsulting.com>:
>
>> Can you try SCons 3.0.0?
>>
>> On Mon, Oct 30, 2017 at 3:40 AM, Albert Arquer <albert.arquer at gmail.com>
>> wrote:
>>
>>> Hello,
>>>
>>> I have been battling with an SCons issue (at least that is what I
>>> believe it is). This problem is intermittent, however it only seems to
>>> appear when I build targets with the "-j" option, launching multiple
>>> threads.
>>>
>>> You can see the error trace here:
>>>
>>> scons: *** [<target_path>] AttributeError : 'module' object has no
>>> attribute 'exists'
>>> Traceback (most recent call last):
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Taskmaster.py",
>>> line 234, in execute
>>>     if not t.retrieve_from_cache():
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Node\FS.py",
>>> line 2935, in retrieve_from_cache
>>>     return self.get_build_env().get_CacheDir().retrieve(self)
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Environment.py",
>>> line 1010, in get_CacheDir
>>>     path = SCons.Defaults.DefaultEnvironment()._CacheDir_path
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Defaults.py",
>>> line 88, in DefaultEnvironment
>>>     _default_env = SCons.Environment.Environment(*args, **kw)
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Environment.py",
>>> line 982, in __init__
>>>     apply_tools(self, tools, toolpath)
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Environment.py",
>>> line 107, in apply_tools
>>>     env.Tool(tool)
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Environment.py",
>>> line 1789, in Tool
>>>     tool(self)
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Tool\__init__.py",
>>> line 197, in __call__
>>>     self.generate(env, *args, **kw)
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Tool\default.py",
>>> line 40, in generate
>>>     for t in SCons.Tool.tool_list(env['PLATFORM'], env):
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Tool\__init__.py",
>>> line 1108, in tool_list
>>>     linker = FindTool(linkers, env) or linkers[0]
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Tool\__init__.py",
>>> line 993, in FindTool
>>>     t = Tool(tool)
>>>   File "C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Tool\__init__.py",
>>> line 113, in __init__
>>>     self.exists = module.exists
>>> AttributeError: 'module' object has no attribute 'exists'
>>> scons: building terminated because of errors.
>>>
>>>
>>> Basically scons seems to fail while loading built-in tools, specifically
>>> during loading of the "mslink" python module, which I assume is something
>>> specific to microsoft windows.
>>> I have tried to narrow it down and have found very little coherency, for
>>> example, if I print the object's attributes, methods, etc. right before
>>> scons fails by putting the following code on the Tool.__init__ method in
>>> SCons/Tool/__init__.py:
>>>
>>>             print("Class of module is: {}".format(module.__class__))
>>>             print("Name is: {}".format(module.__name__))
>>>             print("File is: {}".format(module.__file__))
>>>             print("Doc is: {}".format(module.__doc__))
>>>             print dir(module)
>>>
>>> I get the following:
>>>
>>> Class of module is: <type 'module'>
>>> Name is: SCons.Tool.mslink
>>> File is: C:\Python27\Lib\site-packages\scons-2.5.1\SCons\Tool\mslink.pyc
>>> Doc is: SCons.Tool.mslink
>>>
>>> Tool-specific initialization for the Microsoft linker.
>>>
>>> There normally shouldn't be any need to import this module directly.
>>> It will usually be imported through the generic SCons.Tool.Tool()
>>> selection method.
>>>
>>>
>>> ['RegServerFunc', 'SCons', '__builtins__', '__doc__', '__file__',
>>> '__name__', '__package__', '__revision__', '_dllEmitter', '_dllSources',
>>> '_dllTargets', '_windowsLdmodSources', '_windowsLdmodTargets',
>>> 'embedManifestDllAction', 'embedManifestDllCheck',
>>> 'embedManifestDllCheckAction', 'embedManifestExeAction',
>>> 'embedManifestExeCheck', 'embedManifestExeCheckAction', 'ldmodEmitter',
>>> 'msvc_exists', 'msvc_setup_env_once', 'os', 'pdbGenerator', 'prog_emitter',
>>> 'regServerAction', 'regServerCheck', 'shlibLinkAction',
>>> 'windowsLibEmitter', 'windowsShlinkSources', 'windowsShlinkTargets']
>>>
>>>
>>>
>>>
>>> As you can see the __doc__ text matches the one found in the "mslink"
>>> file, however for some reason the "generate" method is not available and
>>> python crashes when it is called...
>>>
>>> Does anybody have an idea of what could this be due to? I remember when
>>> I installed SCons and launched targets with the -j switch SCons advised me
>>> to install some package for windows, which I did, I don't remember the
>>> package's name right now.
>>>
>>> In absence of a better solution I wonder if it would be possible to stop
>>> scons from loading any of those tools, as I don't think I am using any of
>>> them... This would only be an option if it could be done without modifiying
>>> the SCons source code.
>>>
>>> Thanks!
>>>
>>> _______________________________________________
>>> Scons-users mailing list
>>> Scons-users at scons.org
>>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>>
>>>
>>
>> _______________________________________________
>> Scons-users mailing list
>> Scons-users at scons.org
>> https://pairlist4.pair.net/mailman/listinfo/scons-users
>>
>>
>
> _______________________________________________
> Scons-users mailing list
> Scons-users at scons.org
> https://pairlist4.pair.net/mailman/listinfo/scons-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://pairlist4.pair.net/pipermail/scons-users/attachments/20171031/4d4a5ecc/attachment-0001.html>