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The definition may be mangled while an undefined reference is not. This may come up when (1) the reference is from a C file or (2) the definition misses an extern "C". (2) is more common. Suggest an arbitrary mangled name that matches the undefined reference, if such a definition exists. ld.lld: error: undefined symbol: foo >>> referenced by a.o:(.text+0x1) >>> did you mean to declare foo(int) as extern "C"? >>> defined in: a1.o Reviewed By: dblaikie, ruiu Differential Revision: https://reviews.llvm.org/D69650
See docs/NewLLD.rst