Xcode 9 - failed to emit precompiled header

Question

I have a project in Objective-C as well as in swift by taking MyProjectName-Bridging-Header.h and i also configured the Objective-C Bridging Header. Also i have added 'MyprojectName-Swift.h' in .pch file.

This works fine on xcode 8.2 but when i build my project from xcode 9 i am getting the below error.

failed to emit precompiled header '/Library/Developer/Xcode/DerivedData/MyprojectName-lajanjvhqjnfjksdsndsfkads/Build/Intermediates.noindex/PrecompiledHeaders/MyprojectName-Bridging-Header-swift_44AHJm3Z96qu-clang_2BIMGQVXGEZ09.pch' for bridging header '/Documents/MyProjectLocaiton/FoneApp-Bridging-Header.h'

Please help me out from this. Thanks!

Solution 1

Finally i got the solution of this issue. In my project the Prefix Header path is not clearly defined. Earlier the path was

$(SRCROOT)/MyPrefixHeaderFile.pch

MyPrefixHeaderFile.pch is in another folder inside the project folder, So i update the Prefix Header path to

$(SRCROOT)/FolderName/MyPrefixHeaderFile.pch

Solution 2

I found out that I accidentally opened the ProjectName.xcodeproj file rather than the ProjectName.xcworkspace file.

Open the xcworkspace file, project will start working again!

Solution 3

Read this if you using cocoapods in project. I just update deployment target to iOS 10 or 11 in my case after updating pods and xcode make first build success. So problem was inside podfile where I had line

platform :ios, '11.0'

and my deployment target in project was 9.0 after I change my podfile to platform to

platform :ios, '9.0'

project was fixed.

Solution 4

Also make sure your import of "ProductModuleName-Swift.h" is in your .m file, and not your .h file.

Solution 5

Maybe you created a new target, but forgot to add this to your Podfile:

target 'Pistachio-rrzcpjs' do

end

View more solutions

Comments

[Harshad Madaye]

perfect, i had disabled it to inprove build time , and then i forgot, thanks buddy

[Gustavo Parrado]

I've put it on .h files, it works fine, that's not the problem

[Jefferson Setiawan]

This happen to me too, How do you fix this things?

[Daniel Dramond]

@Harris this was the workaround for me. Thank you.

[Elsammak]

The only answer worked with me..thanks man :+1:

[Marc-Alexandre Bérubé]

Sorry for the delay, you must make sure your header files imported in the bridging header contains all of their dependencies (even those who were implied from the Prefix header)

[iOS]

Really it matters!

[xGoPox]

Thanks! I had this issue while merging branches, my podfile was set to platform :ios, '10.3' while my xcode minimum deployment target was still at 10.0, you need to change it to 10.3 in xcode THEN run pod install

[musical_coder]

You may also need to forward-declare classes and protocols in the .h file: developer.apple.com/documentation/swift/…

[Wide Angle Technology]

How did you do this?

[Ronaldo Albertini]

I was -project and it does not work with *.xworkspace. -workspace solved :)

[Iulian Nikolaiev]

The answer really helped me when I tried to run unit tests. The only thing I needed was to add something like: "target :AppTests do #some pods end" in podfile

[Raphael]

Quite unlike the other suggestions here, this worked for me