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POSCons does not clean all files
 

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  1. POSCons does not clean all files
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    <p>I have a file system containing directories of "builds", each of which contains a file called "build-info.xml". However some of the builds happened before the build script generated "build-info.xml" so in that case I have a somewhat non-trivial SCons SConstruct that is used to generate a skeleton build-info.xml so that it can be used as a dependency for further rules.</p> <p>I.e.: for each directory:</p> <ul> <li>if build-info.xml already exists, do nothing. More importantly, do not remove it on a 'scons --clean'.</li> <li>if build-info.xml does not exist, <strong>generate</strong> a skeleton one instead - build-info.xml has no dependencies on any other files - the skeleton is essentially minimal defaults.</li> <li>during a --clean, remove build-info.xml if it was <strong>generated</strong>, otherwise leave it be.</li> </ul> <p>My SConstruct looks something like this:</p> <pre class="lang-python prettyprint-override"><code>def generate_actions_BuildInfoXML(source, target, env, for_signature): cmd = "python '%s/bin/create-build-info-xml.py' --version $VERSION --path . --output ${TARGET.file}" % (Dir('#').abspath,) return cmd bld = Builder(generator = generate_actions_BuildInfoXML, chdir = 1) env.Append(BUILDERS = { "BuildInfoXML" : bld }) ... # VERSION = some arbitrary string, not important here # path = filesystem path, set elsewhere build_info_xml = "%s/build-info.xml" % (path,) if not os.path.exists(build_info_xml): env.BuildInfoXML(build_info_xml, None, VERSION = build) </code></pre> <p>My problem is that 'scons --clean' does not remove the generated build-info.xml files.</p> <p>I played around with env.Clean(t, build_info_xml) within the 'if' but I was unable to get this to work - mainly because I could not work out what to assign to 't' - I want a generated build-info.xml to be cleaned unconditionally, rather than based on the cleaning of another target, and I wasn't able to get this to work.</p> <p>If I tried a simple env.Clean(None, "build_info_xml") after but outside the 'if' I found that SCons would clean every single build-info.xml file including those that weren't generated. Not good either.</p> <p>What I'd like to know is how SCons goes about determining which files should be cleaned and which should not. Is there something funny about the way I've used a generator function that prevents SCons from recording this target as a Clean candidate?</p>
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    1. COFurther to this - with the above Rule, scons --tree=status does not show an "explicit Builder" for build-info.xml. It shows E (exists) and C (current), but not B (explicit builder). This is the only file without a B, so maybe that's why SCons isn't cleaning it. So why doesn't env.BuildInfoXML qualify as an "explicit builder"?
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    2. COActually, if I manually clean out the entire environment and run 'scons --tree=status path/to/something/that/depends/on/build-info.xml' I get a 'B' for build-info.xml, and SCons builds it as per above Rule. But I think the fact that the rule has 'None' as a dependency means it isn't added to the Clean list...
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