[Scons-users] Weird problem in MS Windows

Thu Nov 2 07:50:54 EDT 2017

Hi Bill,

I might try SCons 3.0.0 when I get a chance, but I don't have time right
now. Besides as I said there is no easy way to know if the issue is fixed
unless the underlying cause is identified.

I would definatelly like to remove c++/visual studio from the tool list (I
am not using any of them, I use EDA tools which I manage manually through a
derived class from Environment). When I instantiate the Environment I
already do it with "tools=[]" but that seems to have no effect.
I don't really know what you mean with the DefaultEnvironment(). As I
stated above I have a custom class deriving from
SCons.Environment.Environment and that is what I use.

-Albert.

2017-10-31 20:03 GMT+01:00 Bill Deegan <bill at baddogconsulting.com>:

> 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!
>>>>
>>>> _______________________________________________
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>>>>
>>>>
>>>
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>>
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