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Do not interpose functions before initialization
Static initializers have no defined order in which they are run; interposed functions, however, take effect at program initialization. In some cases, our interposed functions would be called by libSystem's constructors and prior to *our* constructors, and this would lead to crashes in trace mode as we would be in an uninitialized state. All our interposers now immediately delegate to their interposees until the are sure initialization has been performed. Closes: https://trac.macports.org/ticket/60702
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