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Editorial Team
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Asked: 2026-05-16T11:34:36+00:00

I have a project that needs to incorporate two third-party libraries, libA and libB.

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I have a project that needs to incorporate two third-party libraries, libA and libB. I have little, if any, influence over the third-party libraries. The problem being is that both libA and libB include different versions of a common library, ASIHTTPRequest. As a result, I’m getting errors like:

-[ASIFormDataRequest setNumberOfTimesToRetryOnTimeout:]: unrecognized selector sent to instance 0x3b4170

, which I can only assume are because libA is referring to libB’s implementation of ASIHTTPRequest (or the other way around).

I’ve tried playing around with strip -s <symbol file> -u <library> to isolate the libraries’ symbols from each other, but that results in XCode’s linker spitting out thousands of warnings and doesn’t actually fix the main problem outlined above.

ld: warning: can't add line info to anonymous symbol anon-func-0x0 from ...

In general, how can/should one isolate libraries from each other?

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1 Answer

  1. Editorial Team

    There is absolutely no way to do so. One Objective-C application can have only one meaning for one symbol at a time. If you load two different versions of one library the last one will overwrite the first one.

    Two workarounds:

    1. convince the developer to use a recent version
    2. run both libraries in separate processes
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