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build: add circular dependency checker for build requirements #415

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Commits on Jan 10, 2022

  1. build: add circular dependency checker for build requirements

    Implement a basic build requirement cycle detector per PEP-517:
    
    - Project build requirements will define a directed graph of
    requirements (project A needs B to build, B needs C and D, etc.)
    This graph MUST NOT contain cycles. If (due to lack of co-ordination
    between projects, for example) a cycle is present, front ends MAY
    refuse to build the project.
    
    - Front ends SHOULD check explicitly for requirement cycles, and
    terminate the build with an informative message if one is found.
    
    See:
    https://www.python.org/dev/peps/pep-0517/#build-requirements
    jameshilliard committed Jan 10, 2022
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