iOS Question Library development error: x86_64 symbols not found

Seems that (at least) one of the static libraries you are using is not built for that architecture.

From your terminal, in the folder where these libs are located, type

lipo -info libmwApteligent.a

This will show the achitecture(s) of that library.

It is:
Non-fat file: libmwApteligent.a is architecture: x86_64.

That file was built in Xcode by me.

Ok. I suppose that your library references other libs or frameworks and '_Crittercism' symbol is defined in one of them? Perhaps it is those libs that aren't built for that architecture.

You need to compile a static library twice.
First compile for Generic IOS device. Another for any simulator. Then combine two variants using lipo -create.
For example, lipo -create path1 path2 -output path

As I remember, I set architecture in build settings also. Final .a supported all 4 platforms arm64 armv7 x86_64 i386

Note that if it is a swift library then it will not work on the simulator anyway.

Semen Matusovskiy said:

First compile for Generic IOS device. Another for any simulator.

Click to expand...

How do you do that? I don't see any such options.

JordiCP said:

Ok. I suppose that your library references other libs or frameworks and '_Crittercism' symbol is defined in one of them? Perhaps it is those libs that aren't built for that architecture.

Click to expand...

That symbol is defined in the header and referenced in the .m file that I created. I am not including any binary libs.

Erel said:

Note that if it is a swift library then it will not work on the simulator anyway.

Click to expand...

Good to know. In this case, they are not swift libraries and I have the problem with both the simulator and real device.

Ok, step by step. Let's take Erel's sample. Unlike my description is long, a process requires 5 minutes.


Download libraries.zip, extract files, move iAdMob folder to desktop.
Click iAdMob. Inside you will see iAdMod.xcodeproj. Click it (this starts XCode).

First of all, open Build Settings for project and correct:
1) Architectures -- Architectures
Select standard architectures instead of armv7.
2) Architectures -- Valid architectures
Enter arm64 x86_64 armv7 i386
3) Deployment -- IOS Deployment Target
Select IOS 8.0

Then open Build Phases for Target iAdMob
Remove copy items (we will use another pathes).

Take a look a tree with files. Add file iCore.h from your Libs and remove previous link.

Take a look top left corner of XCode window. Click 'iAdMob', 'Edit schemes'. Select 'Release' for Run button (an icon as a big arrow
Then select Generic IOS device as target device ('combobox' near 'iAdMob'). Click Run button.

Find 'Products' section in the tree of files. Right click over libiAdMob.a. Select 'Show in Finder'. You will see a file. Rename it to libiAdMob1.a and move it to Desktop.

Change Generic IOS device to (for example) iPhone 11 Pro Max and compile again. Rename libiAdMob.a to libiAdMob2.a and move it to Desktop

Start app Terminal. Type

Check platforms
The answer should be

Then you copy libiAdmob.a and iAdMob.h to Libs folder.

Thank you for the detailed explanation. I will give that a try!

I was able to get the iAdMob example to work. Thank you very much for the help. This should help me track down the issue with the wrapper I am working on.