Do not duplicate Tool class creation#4838
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If "default" is part of the tool list, the default.py tool will be run. This calls a function to generate the default tool list, which as a side effect creates a Tool instance for each tool examined. The tool then loops through the returned list, creating a Tool instance for each tool. To alleviate this duplication, the Tool instances are returned in the default list, and if an attempt is made to instantiate a Tool with the "name" argument being an instance already, it is returned as-is. In the default tool - use the routine the SCons.Platform module provides for getting the default tool list. It does the same thing as default.generate did directly, but this way "we're using the API". Signed-off-by: Mats Wichmann <mats@linux.com>
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If "default" is part of the tool list, the
default.pytool will be run. This calls a function to generate the default tool list, which as a side effect creates aToolinstance for each tool examined. The tool then loops through the returned list, creating aToolinstance for each tool. To alleviate this duplication, theToolinstances are returned in the default list, and if an attempt is made to instantiate aToolwith thenameargument being an instance already, it is returned as-is.In the default tool - use the routine the
SCons.Platformmodule provides for getting the default tool list (DefaultToolList). It does the same thing asdefault.generatedid directly, but this way "we're using the API".This is pushed as a draft for a chance to review the basic code setup. There is further pending work on
SCons/Tool/__init__.pyconsisting of more docstring, typing annotations and a few very small cleanups, wanted to avoid those obscuring the main point. These can be added when taking this PR out of draft mode, or submitted as a separate PR.Contributor Checklist:
CHANGES.txtandRELEASE.txt(and read theREADME.rst).