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I'm having a trouble with React Native when I try to add the Google VR SDK ('GVRSDK') as a Podfile dependency, and it's quite easy to replicate.

Steps:

  1. Create a new blank React Native project. Run it with react-native run-ios to ensure it worked.
  2. cd ios
  3. pod init
  4. Add pod 'GVRSDK' to Podfile, execute pod update
  5. cd ..
  6. react-native run-ios

The project crashed with the following error:

duplicate symbol __ZN3fLI9FLAGS_novE in:
/foo/ios/Pods/GVRSDK/Libraries/libGVRSDK.a(vlog_is_on.o)
/foo/ios/build/Build/Products/Debug-iphonesimulator/libReact.a(vlog_is_on.o)
duplicate symbol __ZN3fLI7FLAGS_vE in:
/foo/ios/Pods/GVRSDK/Libraries/libGVRSDK.a(vlog_is_on.o)
/foo/ios/build/Build/Products/Debug-iphonesimulator/libReact.a(vlog_is_on.o)
duplicate symbol __ZN6google13RemoveLogSinkEPNS_7LogSinkE in:
/foo/ios/build/Build/Products/Debug-iphonesimulator/libReact.a(logging.o)
/foo/ios/Pods/GVRSDK/Libraries/libGVRSDK.a(logging.o)
duplicate symbol __ZN6google10AddLogSinkEPNS_7LogSinkE in:
/foo/ios/build/Build/Products/Debug-iphonesimulator/libReact.a(logging.o)
    /foo/ios/Pods/GVRSDK/Libraries/libGVRSDK.a(logging.o)
ld: 4 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)



** BUILD FAILED **


The following build commands failed:

Ld build/Build/Products/Debug-iphonesimulator/foo.app/foo normal x86_64
(1 failure)
John D.
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1 Answers1

2

You can resolve it by removing the duplicated symbol in libGVRSDK.a. The lipo and ar commands are used to disassemble the library file in the several architectures and rearchive them into another file.

I made the shell script as follows:

pod_post_install.sh

#!/bin/bash

cd ./Pods/GVRSDK/Libraries/
lipo -info libGVRSDK.a

# Divide to each platform
lipo -thin armv7 libGVRSDK.a -output libGVRSDK_armv7
lipo -thin i386 libGVRSDK.a -output libGVRSDK_i386
lipo -thin x86_64 libGVRSDK.a -output libGVRSDK_x86_64
lipo -thin arm64 libGVRSDK.a -output libGVRSDK_arm64

# Delete duplicate file
chmod 777 libGVRSDK_armv7
chmod 777 libGVRSDK_i386
chmod 777 libGVRSDK_x86_64
chmod 777 libGVRSDK_arm64

ar -dv libGVRSDK_armv7 vlog_is_on.o
ar -dv libGVRSDK_i386 vlog_is_on.o
ar -dv libGVRSDK_x86_64 vlog_is_on.o
ar -dv libGVRSDK_arm64 vlog_is_on.o

# rm libGVRSDK.a
lipo -create libGVRSDK_armv7 libGVRSDK_i386 libGVRSDK_x86_64 libGVRSDK_arm64 -output libGVRSDK.a

# Delete media
rm libGVRSDK_armv7
rm libGVRSDK_i386
rm libGVRSDK_x86_64
rm libGVRSDK_arm64

cd ../../../

It can be more useful if this script is invoked when every pod install is run.

Podfile

post_install do |installer|
    system(". ./pod_post_install.sh")
end

I believe it helps.

Naoki O.
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