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.

Yes, I've tried everything in the link in the question. It doesn't make sense that clearing the derived data does not fix this problem. — Mark, Oct 16 '13 at 14:26
Possible duplicate of http://stackoverflow.com/questions/14793329/fixing-file-project-pch-has-been-modified-since-the-precompiled-header-was-bui — Brian, Jan 23 '14 at 17:12
Try this... http://stackoverflow.com/a/25843228/2557910 Worked fine for me. — Jorge SV, Sep 15 '14 at 08:05

score 90 · Answer 1 · answered Aug 07 '14 at 12:44

90

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.

answered Aug 07 '14 at 12:44

Gagan_iOS

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Thank you for explaining where they are and the environment you were in. – Morkrom Sep 18 '14 at 18:36
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Deleting the whole ModuleCache folder worked for me with Xcode6 – Toydor Sep 18 '14 at 20:59
OSX 10.10.2/Xcode 6.2. 1) There are no .pcm files listed anywhere in my project. 2) Pressing shift+command+g in Xcode does nothing except make a bonk! sound. 3) There are no .pcm files in the directory ~/Library/Developer/Xcode/DerivedData/ModuleCache/ – 7stud Apr 17 '15 at 04:43
None of my old projects will build, and a new project won't build either. Wow, Xcode6 is a super IDE! – 7stud Apr 18 '15 at 17:06
@7stud I have not started using XCode6.2.x. Might be possible that Apple made some changes in Xcode IDE. – Gagan_iOS May 07 '15 at 12:13
What worked for me was doing what @Laith suggested: `~/Library/Developer/Xcode$ rm -rf DerivedData`. – 7stud May 07 '15 at 16:45
Cool，it is good way to clean pem files. Awesome. Thanks – knight2016 Dec 27 '21 at 10:59
Deleting ModuleCache also worked in 2023 with Xcode 14.3 – bkbeachlabs Apr 25 '23 at 01:30

score 49 · Accepted Answer · edited Jun 29 '21 at 13:16

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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.

edited Jun 29 '21 at 13:16

Jespertheend

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answered Sep 04 '14 at 11:30

Philip McDermott

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I'll switch your answer to the correct one (since I can no longer reproduce the issue, and several people verified that your solution works). – Mark Sep 19 '14 at 03:33
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CAREFUL! This will also wipe out all your archives from all your projects! – jaltek Sep 19 '14 at 12:49
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Instead try deleting `/Xcode/DerivedData/ModuleCache`. That solves the purpose. – Balram Tiwari Sep 24 '14 at 13:08
please, could you explain to me what implicates, in practice, the warning? – biggreentree Dec 19 '21 at 12:30

score 24 · Answer 3 · answered Jan 13 '14 at 08:51

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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

answered Jan 13 '14 at 08:51

khanghoang

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I've tried deleting the whole ModuleCache folder with no success (see question). Unless you're implying that deleting just the CoreBluetooth.pcm will fix the problem. – Mark Jan 14 '14 at 15:23
for my case, i just need to delete pcm file then clean and it worked :) – khanghoang Jan 15 '14 at 09:31
@Mark: ya, i meant so, because in the most of my cases i always try like this first. :D – khanghoang Feb 15 '14 at 08:04
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the solution for me with my Jenkins build was to add rm -Rf $TMPDIR../C/com.apple.DeveloperTools/*/Xcode/*/Xcode/SharedPrecompileHeaders/ – phyzalis Oct 02 '14 at 06:21

score 5 · Answer 4 · answered Oct 16 '13 at 23:48

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

answered Oct 16 '13 at 23:48

Duncan C

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This is the first thing I tried. Clean did not fix the issue, nor did build folder clean. Neither did deleting the derived data folder. – Mark Oct 21 '13 at 20:26
@Mark, sounds like an Xcode bug. I would suggest submitting an Apple Radar bug. – Duncan C Jan 09 '14 at 13:09
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Will do. I'll link the radar bug in the original question once I've submitted it. – Mark Jan 09 '14 at 13:32

score 4 · Answer 5 · answered Oct 16 '13 at 17:40

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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.

answered Oct 16 '13 at 17:40

bunz4u

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This is what the link in my question suggested, and it is the first thing I tried. It does not fix my issue, as the error is thrown again. – Mark Oct 16 '13 at 18:21
The important part for me was to find where my derived data is and cleaning that, rather than assuming it's in ~/Library/. Mine is at ~/Developer/Xcode/DerivedData so I cleaned that and the ModuleCache and that fixed it – ghr Aug 13 '15 at 00:23

score 4 · Answer 6 · answered Aug 14 '14 at 09:50

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.

score 3 · Answer 7 · answered Sep 22 '14 at 13:04

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Manually deleting the DerivedData folder fixed it for me.

answered Sep 22 '14 at 13:04

Laith

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Yes, this worked for me too. Thanks! `$ cd ~/Library/Developer/Xcode/` then `~/Library/Developer/Xcode$ rm -rf DerivedData`. – 7stud Apr 17 '15 at 04:46

score 2 · Answer 8 · answered Oct 16 '13 at 18:22

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

answered Oct 16 '13 at 18:22

Mark

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I agree it's very strange. There's probably something going on that we've missed. An uninstall just happens to reset it. – Mark Dec 18 '13 at 20:28
Slightly less extreme - deleting ~/Library/Developer/Xcode worked in my case (no amount of cleaning did). – Philip McDermott Sep 04 '14 at 11:29
Good to know there's alternatives to uninstalling Xcode. – Mark Sep 04 '14 at 12:39
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Better yet, delete just ~/Library/Developer/Xcode/ModuleCache. That way you don't lose all the other data. – Mark Krenek Sep 18 '14 at 13:20

score 2 · Answer 9 · answered Oct 31 '13 at 12:45

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quit xcode and reopen it .This fixed my problem.

answered Oct 31 '13 at 12:45

satyso

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score 1 · Answer 10 · answered Apr 27 '16 at 06:17

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.

score 0 · Answer 11 · answered Nov 25 '14 at 09:14

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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

answered Nov 25 '14 at 09:14

Maciej Swic

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score 0 · Answer 12 · answered Jan 14 '16 at 15:55

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

answered Jan 14 '16 at 15:55

user2755734

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score 0 · Answer 13 · answered Feb 08 '17 at 03:25

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.

file has been modified since the precompiled header was built

13 Answers13

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