Duplicate Symbols when trying to compile with a library that correctly references GCDWebServer in its podspec file

I've been using realm-js for the better part of the last 5 years in a React Native project, and haven't noticed anything wrong until now.

## Goals

We now need a web server in the project, and I've installed `react-native-static-server`. This has a podspec file, including the GCDWebServer module at `~3.0`.

## Expected Results

This should compile fine and run fine. CocoaPods should handle the version numbers and match accordingly.

## Actual Results

```
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._disconnectDelay' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._bindToLocalhost' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_BindToLocalhost' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._port' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._dnsPort' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_Port' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._dnsSocket' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._authenticationDigestAccounts' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_AuthenticationAccounts' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._authenticationBasicAccounts' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._dnsAddress' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerAuthenticationMethod_DigestAccess' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._connectionClass' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_ConnectionClass' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._handlers' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._options' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_MaxPendingConnections' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._activeConnections' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_CLASS_$_GCDWebServer' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_METACLASS_$_GCDWebServer' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._disconnectTimer' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_CLASS_$_GCDWebServerHandler' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_METACLASS_$_GCDWebServerHandler' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._sourceGroup' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._authenticationRealm' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_AuthenticationRealm' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerLogLevel' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_ConnectedStateCoalescingInterval' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._backgroundTask' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServerHandler._asyncProcessBlock' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServerHandler._matchBlock' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_RequestNATPortMapping' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._syncQueue' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._delegate' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_BonjourType' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_BonjourName' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._serverName' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_ServerName' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerLogMessage' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._dnsSource' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._dnsService' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._resolutionService' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._registrationService' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_AuthenticationMethod' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._suspendInBackground' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_AutomaticallySuspendInBackground' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._connected' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerAuthenticationMethod_Basic' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_GCDWebServerOption_AutomaticallyMapHEADToGET' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._source6' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServer._source4' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServer.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServer.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServerConnection._request' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServerConnection.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServerConnection.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServerConnection._socket' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServerConnection.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServerConnection.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServerConnection._server' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServerConnection.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServerConnection.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServerConnection._handler' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServerConnection.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServerConnection.o)
duplicate symbol '_OBJC_CLASS_$_GCDWebServerConnection' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServerConnection.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServerConnection.o)
duplicate symbol '_OBJC_METACLASS_$_GCDWebServerConnection' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServerConnection.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServerConnection.o)
duplicate symbol '_OBJC_IVAR_$_GCDWebServerConnection._response' in:
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/GCDWebServer/libGCDWebServer.a(GCDWebServerConnection.o)
    /Users/Shared/event/derived/Fenestra-gdmrszbjnenndffhabmlltzkhmco/Build/Products/Debug-iphoneos/libRealmReact.a(GCDWebServerConnection.o)
duplicate symbol '_OBJC_IVAR
```

## Steps to Reproduce

1. Create a new React Native project.
2. Add both realm-js and react-native-static-server using NPM
3. In the `ios` folder run `pods install`
4. Try building the project

## Version of Realm and Tooling

Whilst the versions don't matter as the issue still resides in the latest code, I'll include the ones I'm running in my main codebase.

- Realm JS SDK Version: 3.2.0 (still an issue with 10+)
- Node or React Native: 0.61.1
- Client OS & Version: MacOS 11.1, iOS 14.6, XCode 12.5
- Which debugger for React Native: None

## Proposed Solution

- Remove the `vendor\GCDWebServer` directory and its contents
- Add the string `realm.podspec` to the `files` array in the package.json file
- Add a `realm.podspec` file in the route of the project, which should look something like this:
    ```
    require 'json'
    
    package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
    
    Pod::Spec.new do |s|
      s.name           = package['name']
      s.version        = package['version']
      s.summary        = package['description']
      s.description    = package['description']
      s.license        = package['license']
      s.author         = package['author']['name']
      s.homepage       = package['homepage']
      s.source         = { :git => 'https://github.com/realm/realm-js.git' }
    
      s.requires_arc   = true
      s.platform       = :ios, '12.0'
    
      s.preserve_paths = 'README.md', 'package.json'
    
      s.dependency 'React'
      s.dependency 'GCDWebServer', '~> 3.0'
    end
    ```

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Uh oh!

Duplicate Symbols when trying to compile with a library that correctly references GCDWebServer in its podspec file #3814

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Duplicate Symbols when trying to compile with a library that correctly references GCDWebServer in its podspec file #3814

Description

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Expected Results

Actual Results

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Version of Realm and Tooling

Proposed Solution

Metadata

Metadata

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