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Hi, The LLVM language reference doesn't say that extern_weak is illegal for function definitions, but it seems this restriction is enforced in the code in some places: https://github.com/llvm-mirror/llvm/blob/master/lib/AsmParser/LLParser.cpp#L4591 https://github.com/llvm-mirror/llvm/blob/master/lib/CodeGen/AsmPrinter/AsmPrinter.cpp#L327 However it is possible to create a bitcode file where a function definition has extern_weak linkage. Are these restrictions in the code wrong, or do we just need to update the language reference? -Tom