[Scons-users] A bug in an error message?

[Matthew Marinets]

That’s the issue with this bug. Because it was caused by a particular branch merge, once the issue has been resolved on a computer I’m not sure how to get the file system back into that state.

After trying for a little while, I don’t think I can get the filesystem into any kind of similar state. If I run into it again, I’ll try for the test state, but I don’t think I’ll be able to do it in any reasonable amount of time right now. There’s still one person at my work who hasn’t gone through with this merge, so perhaps I can commandeer his computer when it’s time?

-Matthew

From: Scons-users <scons-users-bounces at scons.org> On Behalf Of Bill Deegan
Sent: June 20, 2018 14:48
To: SCons users mailing list <scons-users at scons.org>
Subject: Re: [Scons-users] A bug in an error message?

Can you reproduce with a small testcase?


On Wed, Jun 20, 2018 at 5:45 PM, Matthew Marinets <Matthew.Marinets at kardium.com<mailto:Matthew.Marinets at kardium.com>> wrote:
This one is a string.

The substitution looks like an issue with the targets, and now that I really squint at my code I realize that the list of targets I pass in might have nested lists inside of it (i.e. [1, 2, [3, 4], 5]). But I thought flattening the target list was handled by the environment’s builder wrapper?

-Matthew

From: Scons-users <scons-users-bounces at scons.org<mailto:scons-users-bounces at scons.org>> On Behalf Of Bill Deegan
Sent: June 20, 2018 14:40

To: SCons users mailing list <scons-users at scons.org<mailto:scons-users at scons.org>>
Subject: Re: [Scons-users] A bug in an error message?

Are your actions python function actions?

On Wed, Jun 20, 2018 at 4:13 PM, Matthew Marinets <Matthew.Marinets at kardium.com<mailto:Matthew.Marinets at kardium.com>> wrote:
I’m running SCons 3.0.0 with Python 2.6.5, on Windows 10.

I haven’t looked into SCons 3.0.1 yet, though I suppose the upgrade shouldn’t be too difficult.

-Matthew

From: Scons-users <scons-users-bounces at scons.org<mailto:scons-users-bounces at scons.org>> On Behalf Of Bill Deegan
Sent: June 20, 2018 12:19
To: SCons users mailing list <scons-users at scons.org<mailto:scons-users at scons.org>>
Subject: Re: [Scons-users] A bug in an error message?

Which version of Python?
Have you tried SCons 3.0.1?

On Wed, Jun 20, 2018 at 2:58 PM, Matthew Marinets <Matthew.Marinets at kardium.com<mailto:Matthew.Marinets at kardium.com>> wrote:
So in my build we have many many custom builders associated with code generation. Normally when things go wrong the error messages are difficult to understand, but this one stumped me for quite a while until I noticed something:

Error message:
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x83 in position 62: invalid start byte:
   File "C:\proj\Branches\Sandbox\multiStim\Canopus\SConstruct", line 332:
                 standardBuild('FirmwareCommon', firmwareRoot + '/Common', env.subst('$versionNumber_Firmware'))
   File "C:\proj\Branches\Sandbox\multiStim\Canopus\SConstruct", line 314:
                 SConscript(componentRoot + '/' + scriptName, exports = ['env', 'mbenv', 'versionNumber'])
   File "C:\Program Files\Python36\scons-3.0.0\SCons\Script\SConscript.py", line 607:
                 return method(*args, **kw)
   File "C:\Program Files\Python36\scons-3.0.0\SCons\Script\SConscript.py", line 544:
                 return _SConscript(self.fs, *files, **subst_kw)
   File "C:\Program Files\Python36\scons-3.0.0\SCons\Script\SConscript.py", line 253:
                  call_stack[-1].globals)
   File "C:\proj\Branches\Sandbox\multiStim\Canopus\Electrical\FPGA\Firmware\Common\SConscript", line 236:
                CMDFLAGS = '/min'))
   File "C:\Program Files\Python36\scons-3.0.0\SCons\Environment.py", line 224:
                 return self.method(*nargs, **kwargs)
   File "C:\proj\Branches\Sandbox\multiStim\Tools\Python\KSCons\GenerationTools\PacketGen.py", line 131:
                  action = packetGenAction,)
   File "C:\Program Files\Python36\scons-3.0.0\SCons\Environment.py", line 1965:
                 return bld(self, target, source, **kw)
   File "C:\Program Files\Python36\scons-3.0.0\SCons\Builder.py", line 635:
                 return self._execute(env, target, source, OverrideWarner(kw), ekw)
   File "C:\Program Files\Python36\scons-3.0.0\SCons\Builder.py", line 557:
                 _node_errors(self, env, tlist, slist)
   File "C:\Program Files\Python36\scons-3.0.0\SCons\Builder.py", line 303:
                 msg = "Two environments with different actions were specified for the same target: %s\n(action 1: %s)\n(action 2: %s)" % (t,t_contents.decode('utf-8'),contents.decode('utf-8'))

What this error message is trying to say is that there are two commands to generate the same target. However, the error message displayed at the top is “UnicodeDecodeError: 'utf-8' codec can't decode byte 0x83 in position 62: invalid start byte:” This is because the intended error message isn’t formatted properly, and just ends up throwing its own error to mask the original.

Has anyone else run into this problem? Am I doing something wrong or is this a bug?

Thanks,
-Matthew

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