Linker command failed with exit code 1 - duplicate

Question

Since I've updated to Xcode 8.1 I can't archive and also not run in Release mode (in debug mode its working). The error is that there are several "duplicate symbols for architecture arm64" and all are "duplicate symbol __TMRbBp". Whats that?

Answer 1

I had similar issues with Version 9.2 (9C40b), the solution is

0) Close Xcode
1) Open project folder in terminal
2) pod update
3) open .
4) open project by clicking Project.xcworkspace

Answer 2

For those that can't get the Thorax's answer to work, what I did was I closed out Xcode, ran pod update on my command line and then reopened the .xcworkspace file. After doing that, I was able to build and run the project.

I am using the Firebase Cocoapod and Xcode version 9.1.

Answer 3

Surprisingly, in some occasions, simply cleaning the product worked for me.

• Product/Clean (Shift+Cmd+K)
• Product/Clean Build Folder (Alt+Shift+Cmd+K)

Quick fix to try before looking at other solutions.

Answer 4

close you project then open xcode go to file -> open search your project and open it . this worked for me

Answer 5

I faced the same problem with archiving on Xcode 8.1.

X Code Version: Version 8.2.1 (8C1002)

The following fix worked on Mar 2019

1) Go to Project & Select your Project

2) Select Build Settings -

Search for "Enable Bitcode" Set option as "NO"

3) Most of version will fix this issue, for few other XCode version try this option also,

Search for "Reflection Metadata Level" Set option as "NONE"

Answer 6

It seems to be a bug in Swift. See discussion on Apple developers portal

It is said to be fixed in Xcode version that is about to be released. But for now there is temporary workaround:

Go to your target Build Settings and set Reflection Metadata Level flag to None