file has been modified since the precompiled header was built

Question

So I accidentally modified a header (CBCentralManager.h) and caused the above error to show when I build. I searched stack overflow for the solution, and found this. Even after deleting the derived data, I still get the same error. I've also tried to delete the ModuleCache/FUW5IOHP9BIS folder with no success.

Here is the specific error I'm seeing:

file /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS7.0.sdk/System/Library/Frameworks/CoreBluetooth.framework/Headers/CBCentralManager.h' has been modified since the precompiled header '/var/folders/pj/hslm53_51xxd_npfqym5r6z00000gn/C/com.apple.DeveloperTools/5.0-5A1412/Xcode/5.0-5A1412/Xcode/ModuleCache/FUW5IOHP9BIS/CoreBluetooth.pcm was built

Any help is greatly appreciated.

Answer 1

Deleting ~/Library/Developer/Xcode and restarting Xcode fixed this for me (Xcode 6 B7). Suspect an aggressive caching bug. Warning! This deletes archives from all your projects.

No amount of cleaning / build folder cleaning / derived data deleting helped before that.

Answer 2

I tried deleting the precompiled ~/Library/Developer/Xcode and restarting Xcode, plus a few of the other ideas presented here, nothing was working. As it seems to be a multiple-target kind of issue, I found after changing the target to another target, building/uploading the other target successfully, then changing back (after doing the other things) to the target I was looking to build / upload originally, I was finally successful.

Answer 3

I was facing this issue. Deleting moduleCache and restarting Xcode & Mac did not help me to resolve the issue.

Solution that worked for me: I copied the path "/private/var/folders/5s/1q3qz48j6zxc028txvdyqhwr000btt/C/org.llvm.clang/ModuleCache" in Finder->Go to folder, deleted all the folders from that ModuleCache.

Now I am able to build successfully.

Answer 4

Nothing above works for me, even uninstalling Xcode. Finally, I tried copying the modified file from other project to my current project, this worked.

Answer 5

You can also try these, clean and then build again

find /var/folders 2>&1 | grep -v 'Permission denied' | grep '\.pcm' | xargs rm
find ~/Library/Developer/Xcode/DerivedData 2>&1 | grep -v 'Permission denied' | grep '\.pcm' | xargs rm

Answer 6

Manually deleting the DerivedData folder fixed it for me.

Answer 7

Deep clean (Cmd + Opt + Shft + K), clearing folder DerivedData, clearing simulator, restarting Xcode and mac doesn't work for me.

Problem was fixed only after changing pch-file (adding a whitespace or comment/uncomment some code). File was incorrectly cached on build phase by Xcode. Changing this file fixed problem.

Answer 8

I faced this issue on OS10.10 with Xcode 6. I resolved issue by removing .pcm files.

To delete press 'shift+command+g' & delete all .pcm files or goto the folder ~/Library/Developer/Xcode/DerivedData/ModuleCache/ & delete all .pcm files.

Perform deep clean by pressing 'shift+alt+command+k.

Hope it will work for you.

Answer 9

Remove the pcm file

rm "/var/folders/pj/hslm53_51xxd_npfqym5r6z00000gn/C/com.apple.DeveloperTools/5.0-5A1412/Xcode/5.0-5A1412/Xcode/ModuleCache/FUW5IOHP9BIS/CoreBluetooth.pcm"

then

Clean Project( Cmd+Shift+K)

Problem solved

Answer 10

quit xcode and reopen it .This fixed my problem.

Answer 11

Just select clean from the project menu. That should force a complete rebuild and solve the rproblem.

Answer 12

So it seems the only way to fix this issue is to uninstall Xcode and download it again. This fixed my problem.

Answer 13

Try going to your Organizer -> Projects, and you'll see the path for where you're derived data is saved. Mine looks something like "~/Library/Developer/Xcode/DerivedData/[Project name]-[mumbo jump]"

Delete the "[Project name]-[mumbo jump]" folder, and you should be all good.