React-native: Undefined symbols for architecture x86_64 libReact.a(RCTJSCExecutor.o) with xcworkspace cocoapods

[greenteamer]

Undefined symbols for architecture x86_64:
"std::terminate()", referenced from:
___clang_call_terminate in libReact.a(RCTJSCExecutor.o)
"operator delete", referenced from:
-[RCTJSCExecutor dealloc] in libReact.a(RCTJSCExecutor.o)
executeRandomAccessModule(RCTJSCExecutor_, unsigned int, unsigned long, unsigned long) in libReact.a(RCTJSCExecutor.o)
readRAMBundle(std::__1::unique_ptr<__sFILE, int (_)(__sFILE_)>, RandomAccessBundleData&) in libReact.a(RCTJSCExecutor.o)
RandomAccessBundleData::~RandomAccessBundleData() in libReact.a(RCTJSCExecutor.o)
"operator new", referenced from:
executeRandomAccessModule(RCTJSCExecutor_, unsigned int, unsigned long, unsigned long) in libReact.a(RCTJSCExecutor.o)
readRAMBundle(std::__1::unique_ptr<__sFILE, int (_)(__sFILE_)>, RandomAccessBundleData&) in libReact.a(RCTJSCExecutor.o)
"___cxa_begin_catch", referenced from:
___clang_call_terminate in libReact.a(RCTJSCExecutor.o)
"___gxx_personality_v0", referenced from:
-[RCTJavaScriptContext initWithJSContext:onThread:] in libReact.a(RCTJSCExecutor.o)
-[RCTJavaScriptContext init] in libReact.a(RCTJSCExecutor.o)
-[RCTJavaScriptContext invalidate] in libReact.a(RCTJSCExecutor.o)
RCTNSErrorFromJSError(RCTJSCWrapper_, OpaqueJSContext const_, OpaqueJSValue const*) in libReact.a(RCTJSCExecutor.o)
+[RCTJSCExecutor runRunLoopThread] in libReact.a(RCTJSCExecutor.o)
-[RCTJSCExecutor init] in libReact.a(RCTJSCExecutor.o)
-[RCTJSCExecutor initWithUseCustomJSCLibrary:] in libReact.a(RCTJSCExecutor.o)
...
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[greenteamer]

solved the problem by removing MyProjectTest from Target, but only relevant if you don't write tests for your project...

I getting this error after react-native link & pod install

pod 'GoogleMaps'
pod 'Fabric'
pod 'Crashlytics'

[chirag04]

see if -lc++ is added to Other linker flags for your test target. Feel free to close this issue if it's resolved for you.

[greenteamer]

@chirag04 unfortunately it's not working for me, i'm already have -lc++

[robwalkerco]

@greenteamer Was just fighting the same issue, then realised that I needed to add the -lc++ flag to my test target, as it was missing from there, rather than from my apps target.

Hope that helps

[akshay2604]

Can you please elaborate on how to set -lc++ in otherLinker flags in test target.

[rogerkerse]

Same problem. And it happens even when I:

1. Make a brand new React native project
2. pod init
3. pod install

Then the project won't start anymore and will give 14 errors together with the same problem Undefined symbols for architecture x86_64

[alvelig]

@rogerkerse Same for me. Please let know when solve that. Removed tests for now...

[emadicio]

@rogerkerse @alvelig https://github.com/facebook/react-native/issues/8880#issuecomment-236994554 this worked for me! :)

[AndrewHenderson]

@greenteamer I deleted the tests target and no longer receive the error - the build is now succeeding. I'd like to write tests at some point. Is there another known solution for this?

[kevindavis]

adding lc++ to the other linker flags worked for me

@akshay2604 : in the xcode project navigator (leftmost option in the sidebar), select the project - the topmost item in the hierarchy

there should be a dropdown in the top left that lets you select the target - select the test target, and navigate to 'build settings' > 'all' .. you should see a 'other linker flags' line that you can add an item to

[C3-TKO]

How can I set the linker flag manually? My xcode instance constantly crashes as soon as i try to add the flag to the test target within the ui editor.

[GreenAsJade]

@kevindavis Thanks for your instructions about how to globally set the linker flags! I have been following instructions all over the place for this, and no joy - I must have missed one somewhere. Your instructions saved the day!