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Question by Litovets · Sep 17, 2020 at 06:15 PM · iosxcodeil2cpplinker

Xcode - Mach-O Linker Error after upgrade to Unity 2019.4 (LTS)

I have a problem with build the project for iOS with Unity 2019.4.5 and even with 2020.1.3 The build is success with Unity 2018.4.19, so I guess something was changed in build process. I have a static library named libSkyTrakSW.a, and linking errors are related to this library: alt text

I've used the same project and static library in Unity 2018.4 and 2019.4, so, that is why I think something changed in il2cpp build process.

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avatar image JoshPeterson · Sep 21, 2020 at 10:56 AM 0
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Does libSkyTrakSW.a use code from zlib? I believe that Unity changed its internal use of zlib so that zlib's symbol names would not conflict with other copies of zlib possibly linking in to the same binary.

It looks like your project might have been using the zlib symbol names that Unity used previously.

avatar image Litovets JoshPeterson · Sep 21, 2020 at 11:36 AM 0
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libSkyTrakSW.a is not using zlib. It uses libcurl.a, libcrypto.a, libssl.a and libsqlcipher.a So, I guess, libcurl.a requires libz.

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