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

[Matthew Marinets]

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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