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...t will after all plugins that do use it. If there are multiple plugins in a registry not using the argument it will follow the same 'static initialization order fiasco' that is currently observed. I have created a basic implementation of this along with tests here https://reviews.llvm.org/D91454. As the extra parameter is optional it will remain backwards compatible with source code, but external plugins would need to be recompiled to adopt this (though thats usually the case with every major release) Thanks for reading, Nathan James