Xcode 9 - failed to emit precompiled header [duplicate]

Answer 1

Maybe you create a new target, but you didn't add this at podfile

Answer 2

Also if you have multiple targets, be aware to include your #imports in every file.

Answer 3

You can try this solution. I have solved the same problem by this way.

Product > Scheme > Edit Scheme > Select "Build" on Left Menu > Find implicit dependencies

Under the build tab, check 'Find implicit dependencies':

Then make a clean and build again.

Answer 4

In my case I had the same compiler error with additional errors like "Unknown type" in one of my project files, So I just added this to the problematic file, and it solved it instantly.

#import <UIKit/UIKit.h>

Answer 5

in my point of view I solved simply switch the order of import statements and build works fine.

Answer 6

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