Extra Clang Tools 5 documentation

clang-tidy - cppcoreguidelines-interfaces-global-init

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This check flags initializers of globals that access extern objects, and therefore can lead to order-of-initialization problems.

This rule is part of the “Interfaces” profile of the C++ Core Guidelines, see https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Ri-global-init

Note that currently this does not flag calls to non-constexpr functions, and therefore globals could still be accessed from functions themselves.

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