[Scons-users] Weird problem in MS Windows

[Bill Deegan]

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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