Reference to 'X' is ambiguous

Question

After several changes to my project I suddenly get this build error:

Reference to \'kCGImageAlphaPremultipliedLast\' is ambiguous

<

Answer 1

I have got this problem when I have imported a header file twice. After one of them is removed, the problem disappears.

Answer 2

Ok after creating a new Project and coping everything to this project the build was successful however i got this "Malformed or corrupted AST file" error several times again but it can be solved by:

• Clean the project
• Deleting everything inside '~/Library/Developer/Xcode/DerivedData/ModuleCache/' (the button inside the organizer window did not work for me)
• Clean once more
• Build project

after that it works just fine except that i have to do this fix from time to time

i also did a diff to the old project and it seems a lot of frameworks and other old stuff got stuck in there from testing things so in case you have this check your project settings file for old stuff.

i thought that xcode and me can be friends one day. guess not...

Answer 3

Remove use_frameworks! from pod file fix my ambiguous problem.

Answer 4

I just had the same warnings littering up my build report (but only under the triangle). In the end what worked for me was to insure that EVERY usage of:

#import <Module/Module.h> 

in the app was replaced by:

@import Module;

Now all those annoying warnings are gone!

Answer 5

Well some solutions here are nice but use_frameworks! is exactly what I need now even thou it made this problem happening. But it looks like build does not like when I use frameworks and header is referenced twice like this

#import "TSMessage.h"
#import "TSMessage+CSExtension.h"

but problem gets away when it compiles like this

#import "TSMessage+CSExtension.h"

Answer 6

This's maybe you import like this:

#import "xxxx.h"

I fix it through this:

#import < xxxx/xxxx.h>