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Asked: 2026-06-05T17:23:24+00:00

Error on link: ld: duplicate symbol _OBJC_METACLASS_$_Reachability in /Users/jmf/Documents/iOS Development/jmf_Client/jmf/jmf/ww_libs/libmfcbroem_ios.a(Reachability.o) and /Users/tpf/Library/Developer/Xcode/DerivedData/jmf-erlknghfcpoomnfanzovahfacgpv/Build/Intermediates/jmf.build/Debug-iphoneos/jmf.build/Objects-normal/armv7/Reachability.o for architecture

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Error on link:

ld: duplicate symbol _OBJC_METACLASS_$_Reachability in /Users/jmf/Documents/iOS Development/jmf_Client/jmf/jmf/ww_libs/libmfcbroem_ios.a(Reachability.o) and /Users/tpf/Library/Developer/Xcode/DerivedData/jmf-erlknghfcpoomnfanzovahfacgpv/Build/Intermediates/jmf.build/Debug-iphoneos/jmf.build/Objects-normal/armv7/Reachability.o for architecture armv7

If I simply remove the h/m files (and associated import directives) in hopes of just using the Reachability in libmfcbroem_ios.a…the linker throws this:

Undefined symbols for architecture armv7:
  "_kReachabilityChangedNotification", referenced from:
      -[MKNetworkEngine initWithHostName:customHeaderFields:] in MKNetworkEngine.o
      -[MKNetworkEngine dealloc] in MKNetworkEngine.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

How can I tell the linker to utilize Reachability from the “a” file?

(disclaimer, I’m just getting started with ObjC/iOS)

Thanks for any help…

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1 Answer

  1. Editorial Team

    Remove the Reachability.m file, include only the header

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