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The -phony-externals option adds a generator which explicitly defines any otherwise unresolved externals as null. This transforms link-time unresolved-symbol errors into potential runtime null pointer accesses (if an unresolved external is actually accessed during execution). This option can be useful in -harness mode to avoid having to mock a large number of symbols that are not reachable at runtime (e.g. unused methods referenced by a class vtable).
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