d40f847497
* Add missing MultiMethodMeta metaclass in builders and remove the Python 2 fallback option in favor of hard errors to catch similar issues going forward. The fallback option can cause about 10K stat calls due to use of `realpath` in the inspect module, depending on how deep Spack itself is nested in the file system, which is ... undesirable. * code shuffling to avoid circular import * more reshuffling * move reserved variant names into variants module |
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