Duplicate symbols when building iOS8 extension target

Question

I spend hours trying Extension target to use separate pods config from main target. The reason for that is that Pods are duplicated for extension target and thus making your whole app about twice in size. Need to make Extension contain only pods that's necessary there.

There seem to be some magic that XCode does when embedding Extension into main target, and CocoaPods seem to be oblivious to that whole procedure? Or I am doing it wrong? I tried al kinds of Podfile configurations, nothing works. Anyone was able to successfully achieve that?

to reproduce:

Create a new project, target "MainTarget"
select Add Target > Today Extension, name target "Extension"
Create podfile:

target 'MainTarget' do
pod 'RestKit', '~> 0.20.3'
pod 'AFNetworking', '~> 1.3.1'
pod 'SSKeychain', '~> 1.2.0'
pod "MagicalRecord/Shorthand", '~> 2.2'
pod 'StyledPageControl', '~> 1.0'
pod 'GoogleAnalytics-iOS-SDK', '~> 3.0.2'
end

target 'Extension' do
    pod 'AFNetworking', '~> 1.3.1'
end

4 run pod install 5 build

result:

/Users/d/Library/Developer/Xcode/DerivedData/MainTarget-fvmcyblwdybpkdgfzflcjhqpjxab/Build/Products/Debug-iphonesimulator/libPods.a(AFHTTPRequestOperation.o)
/Users/d/Library/Developer/Xcode/DerivedData/MainTarget-fvmcyblwdybpkdgfzflcjhqpjxab/Build/Products/Debug-iphonesimulator/libPods-MainTarget.a(AFHTTPRequestOperation.o)
duplicate symbol _OBJC_IVAR_$_AFHTTPRequestOperation._successCallbackQueue in:
/Users/d/Library/Developer/Xcode/DerivedData/MainTarget-fvmcyblwdybpkdgfzflcjhqpjxab/Build/Products/Debug-iphonesimulator/libPods.a(AFHTTPRequestOperation.o)
/Users/d/Library/Developer/Xcode/DerivedData/MainTarget-fvmcyblwdybpkdgfzflcjhqpjxab/Build/Products/Debug-iphonesimulator/libPods-MainTarget.a(AFHTTPRequestOperation.o)

...(and so on... every file repeated 4 times.)

ld: 2148 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

score 3 · Answer 1 · edited May 23 '17 at 12:29

3

This is because you're including AFNetworking at least twice. If it is the only library you need in your extension you should use:

target 'Extension', :exclusive => true do
  pod 'foo'
end

Documented here

If you would instead like all your libraries linked to your extension you should remove your 'MainTarget' group and use link_with as shown here

edited May 23 '17 at 12:29

Community

1
1

answered Sep 20 '14 at 08:11

Keith Smiley

61,481
12
97
110

1

When I try with `exclusive` I get `ld: library not found for -lPods` – Roman Sep 20 '14 at 11:01
also when sued with `link_with` I get exactly same error – Roman Sep 20 '14 at 11:04
And not only AFNetworking is duplicated. Everything from main target pods appear duplicated – Roman Sep 20 '14 at 11:06

score 3 · Answer 2 · answered Sep 23 '14 at 15:17

3

I figured out how to do it thanks to Keith Smiley. It required me a little testing. Here is what I did

platform :ios, 7.0

link_with ['Target', 'Target todays widget']

pod 'AFNetworking', '~> 2.2'

Than I had to remove the libPods.a and the others before redoing a pod install and it worked.

answered Sep 23 '14 at 15:17

jfgrang

1,148
13
13

1

Can you please share, How does your full Podfile look? I still don't really see how it separates dependencies into two groups each for each target – Roman Sep 23 '14 at 19:13
This is all my pod file. – jfgrang Sep 23 '14 at 21:38

Duplicate symbols when building iOS8 extension target

2 Answers2