[Scons-users] Exceptions make SCons refuse to clean

[Plunket, Tom]

I have written a number of scanners and builders for processing data files.

The workflow is essentially:

Digital content creation tool (artist workflow) -> [Export plugin] -> XML file -> [lots of dependencies discovered] -> bundle XML DOM with dependencies

The dependencies are other digital assets, audio, video, that sort of thing. These all get built correctly. SCons drives this whole process, starting with feeding a script to the DCC tool on the command line.

Sometimes the DCC tool data specifies one dependency with different "build" parameters. E.g. a bitmap is specified once with certain compression settings and again with different settings. I do not correctly handle this yet in my scanner as the output filename is based on the input filename. Therefore I get, "Two environments with different actions were specified for the same target:" followed by the filename.

Ok so then I "fix" the input asset so I can continue working on this stuff until I come up with a good solution to the problem but oh! I can't do a clean because I get the same error.

So the issue I'm running into, and one I've seen other times and thought weird but at least didn't hang me up, is that SCons seems to scan intermediate assets that are due to be replaced and presumably generates work to be done and then does it again when that intermediate asset is replaced.

In software build parlance, it's like it's scanning the existing .o files even though the .c files need to be recompiled. (I realize that this case doesn't mean much since the .o files don't generate new dependencies but this is the problem that I'm trying to solve.)
My builders also allow me to shortcut the DCC export and copy a previously-exported XML file but that doesn't fix the problem because the scan of the bad asset happens before it's overwritten by the good one.

So, does anyone know how I can clean an asset that has partially built and generated an error, when that error then prevents a clean because the asset scan results in the same problem? I even tried using -i on the command line to ignore errors but errors are not ignored. :-\

Thanks a ton,
Tom

My apologoies for the following, it is added automatically by the email gateway and I cannot suppress it:
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