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...have concluded this whas a Windows thing. It first occurred in 1c5b428ff8234cef705bf57bc1418deb4db25c83 (SVN r23921) when Windows support was not yet a thing. LLVM tools themselves, like opt, call some function for each LLVM component directly (such as initializeCore()) to achieve the same thing. Howwer clang does include LinkAllPasses.h (in cc1_main.cpp). All that matters is that there is a strong reference to at least one symbol to each object file, otherwise the linker will not include it when. Michael

Oh, right, this stuff. I guess the non-windows solution might've been a volatile read, for instance? So maybe not so much that the general machinery isn't needed, but that perhaps MSVC does something interesting with a volatile read or whatever other solution might've been used. Hmm, not sure why the whole file was added only when MSVC support was added - if it is a "static