1 duplicate symbol for architecture x86_64

Question

I am not sure what I have done wrong.
I moved my project folder to another folder and copied the backup folder to desktop.
I tried to open the backup project and build, I received the linker error.
So I decided to I delete my backup folder and moved back my project folder to desktop. I can't compile anymore and received the following error.

 Showing Recent Issues clang: error: linker command failed with exit code 1 (use -v to see invocation)

duplicate symbol _main in:
/Users/BRO/Library/Developer/Xcode/DerivedData/SFITNESS-flzvwdymttxhducvwvmhpuaqfzhj/Build/Intermediates.noindex/SFITNESS.build/Debug-iphonesimulator/SFITNESS.build/Objects-normal/x86_64/main-90EC778DD760FD57.o
/Users/BRO/Library/Developer/Xcode/DerivedData/SFITNESS-flzvwdymttxhducvwvmhpuaqfzhj/Build/Intermediates.noindex/SFITNESS.build/Debug-iphonesimulator/SFITNESS.build/Objects-normal/x86_64/main-F627C2B37F247040.o
ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

No derived data folder

Still the same

1. I opened Derived Data folder and deleted everything in it
2. I deletes all the project in all simulator
3. I restarted xCode, Clean and build

Still the same

Added the project into GitHub

The link

/Users/mac/Library/Developer/Xcode/DerivedData delete that folder — , Apr 05 '18 at 10:23
Chk this answer https://stackoverflow.com/questions/24298144/duplicate-symbols-for-architecture-x86-64-under-xcode?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa. This might help/ — skJosh, Apr 09 '18 at 12:12
As your description. I guess the reason is your `library search path` into the setting of the project. just try to edit it. — lee, Apr 10 '18 at 07:13
Edit what for library search path, can you elaborate a bit more please — Hanz Cheah, Apr 10 '18 at 08:45
@HansheungCheah Can you attached screenshot of linker flag ? — Vivek, Apr 10 '18 at 11:53
Please check, may be you have import .m file except .h file. — aBilal17, Apr 10 '18 at 12:01
Or check in your libraries _main is duplicated, It should always be one. — aBilal17, Apr 10 '18 at 12:05
Ah..I figure out it's that I have multiple entries under Targets/Compiled Sources ( in newer XCode it's under Build Phases/Compile Sources ). I removed them and the problem is solved. The multiple entry thing probably has to do with Git merge. — aBilal17, Apr 10 '18 at 12:08
@HansheungCheah refer this it same as your problem i think https://stackoverflow.com/questions/3380972/xcode-duplicate-symbol-main — , Apr 10 '18 at 12:41

Rashed · Accepted Answer · 2018-04-10T15:31:50.193

7

You need to add necessary framework to your project. Check all third party party framework and search its required framework for support. For e.g. if you add google analytic then you need to add CoreData , Foundation etc framework. There is some framework is missing for which third party framework needs.

Or you can-

Press "Cmd + Shift + K" or shift + cmd + alt + k to clean up, and quit Xcode.
Delete the cache Run "rm -rf ~/Library/Developer/Xcode/DerivedData" in terminal
Open the project and re-build it

Linker command failed with exit code 1 - to solve this error press "Cmd + Shift + K" or shift + cmd + alt + k this will do the work for you. I also have this same issue but solved by using this line . Hope this will solve your problem.

OUTPUT OF YOUR PROJECT -

edited Apr 10 '18 at 15:31

answered Apr 10 '18 at 09:26

Rashed

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Hi thanks Rashed, I have tried your solution but it didn't work. Tried many times to delete the DerivedData and restart xCode. It still won't build. – Hanz Cheah Apr 10 '18 at 09:40
did you try shift + cmd + alt + k? – Rashed Apr 10 '18 at 09:45
I suspect some files or code that I have downloaded from gitHub which I have added long time ago that was not properly referenced in objective C after I have copy the folder around. – Hanz Cheah Apr 10 '18 at 09:51
that will not be a problem – Rashed Apr 10 '18 at 09:53
This answer has been edited to add spam images, and should probably be removed. – matt Sep 22 '19 at 18:56

score 5 · Answer 2 · answered Apr 15 '18 at 06:46

5

duplicate symbol _main

You have two main.m files and the function main() is in conflict.

Just delete the main.m under CERangeSlider and it should work.

answered Apr 15 '18 at 06:46

Shaheen M Basheer

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score 4 · Answer 3 · edited Apr 10 '18 at 13:16

4

I have cloned your project from github, I found that the main.m file is repeated in SFITNESS and CERangeSlider You may delete one of them and your project will work.

edited Apr 10 '18 at 13:16

aBilal17

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answered Apr 10 '18 at 12:32

a.masri

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score 0 · Answer 4 · edited Apr 06 '18 at 04:38

0

how to get derived data

Open Xcode.
Open Xcode preferences (Cmd + ,)
Select location option.
now you have scene, now click on the point as shown in below image.
your derived data is now opened (suggest you to add drive data in finder left menu). Delete whatever inside the drive data.
now delete your project from simulator.
clean and build your project.

If you are still facing issues then let us know so that we can help accordingly.

edited Apr 06 '18 at 04:38

koen

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answered Apr 05 '18 at 10:50

dahiya_boy

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Hi, I have tried your step but still the same error? – Hanz Cheah Apr 09 '18 at 08:17

1 duplicate symbol for architecture x86_64

No derived data folder

Still the same

Added the project into GitHub

4 Answers4

Linked