Quick update for anyone who is interested, since this has been a wild experience for me, I have wrapped quiet a few B4i libraries before, most of them for personal and some of them for clients.
This specific library which I posted a question about on this other thread has had me chasing my own tail for about 2 weeks now, and I must say I was on the border of throwing myself in front of a train due to the stress
hopefully this helps anyone else who comes across this same issue.
Basically, I created the library wrapper in xcode, added the necessary frameworks, dependencies etc. This is the first time I wrapped a library that gets build with CocaPods, it was interesting learning a little about Pods, the library compiles just fine, I added it to the Libs folder in my local build host, also added the .a library file along with the header file, created the xml file from the header file and added it to my AdditionalLibs folder in my PC, up until this point everything is fine and dandy, however upon compiling and running the app, even though the app doesn't crash, I kept getting this error:
This had me working day and night for almost 2 weeks, I wish I had taken a step back and calm myself down and thought a little bit more about the error. Finally after taking a break I was able to see clear and think things through, I created an Xcode example where I integrated the library I was wrapping, ran the project on my iPhone device and it worked perfectly, no errors, so now the question was, what am I missing, what is the difference between the Xcode Project and my B4i project, Erel suggested I compare the contents of both IPA files from both projects, however that didn't really give me any more insight as to what the issue was.
Finally I started going through the Build Settings of each project in Xcode, the native Xcode project and the B4iProject opening it in Xcode, I started seeing all this different settings under Build Settings of the native xcode project, I asked ChatGPT, Gemini and a few other AI services, and all of them were hinting at possibly missing graph file, however I was 1000% sure that the said graph file was being included in the B4i project, as I could see the libMediaPipeTasksCommon_device_graph.a file inside the project, so how could this be.
Until I realized that there are some linker flags that are added to the native Xcode project when initializing the Pod and installing the MediaPipeTasksVision.framework and MediaPipeTasksCommon.framework, there seems to be some scripts that run when compiling that add those extra linker flags to the Build Settings Tab. The main linker flag I was missing was:
Apparently this linker flag is needed when working with libraries that are written in C++ and it forces the compiler to link all the symbols associated with the library.
Now I can compile and run the B4i project directly from Xcode and the library doesn't give me the error anymore, also I had to unlink the file from the Build Phase tab, otherwise I would get an error saying there were duplicate symbols.
Now my question is the following, given that I need to add those linker flags to the project, is there a way to add this linker flags through B4i, my guess is NO, as I haven't found anything relating to this in the forums, but was wondering given that this is a community full of very smart people, how can we figure this out, hopefully @Erel has some additional insight regarding this, but I really need to deliver this project to my client, I have tried setting that linker flags in the b4i library wrapper xcode project, but it seems that when the app gets compiled B4i clears those linker flags, hence the need to add them manually, the problem with this is that when I need to make changes to the library wrapper, or add more functions and I need to recompile then I need to set the linker flags manually again.
Any thought, suggestions and ideas are welcome, hopefully this helps someone else who comes across this issue.
Thank you all.
This specific library which I posted a question about on this other thread has had me chasing my own tail for about 2 weeks now, and I must say I was on the border of throwing myself in front of a train due to the stress
hopefully this helps anyone else who comes across this same issue.Basically, I created the library wrapper in xcode, added the necessary frameworks, dependencies etc. This is the first time I wrapped a library that gets build with CocaPods, it was interesting learning a little about Pods, the library compiles just fine, I added it to the Libs folder in my local build host, also added the .a library file along with the header file, created the xml file from the header file and added it to my AdditionalLibs folder in my PC, up until this point everything is fine and dandy, however upon compiling and running the app, even though the app doesn't crash, I kept getting this error:
No registered object with name: mediapipe::tasks::vision:ose_landmarker:
This had me working day and night for almost 2 weeks, I wish I had taken a step back and calm myself down and thought a little bit more about the error. Finally after taking a break I was able to see clear and think things through, I created an Xcode example where I integrated the library I was wrapping, ran the project on my iPhone device and it worked perfectly, no errors, so now the question was, what am I missing, what is the difference between the Xcode Project and my B4i project, Erel suggested I compare the contents of both IPA files from both projects, however that didn't really give me any more insight as to what the issue was.
Finally I started going through the Build Settings of each project in Xcode, the native Xcode project and the B4iProject opening it in Xcode, I started seeing all this different settings under Build Settings of the native xcode project, I asked ChatGPT, Gemini and a few other AI services, and all of them were hinting at possibly missing graph file, however I was 1000% sure that the said graph file was being included in the B4i project, as I could see the libMediaPipeTasksCommon_device_graph.a file inside the project, so how could this be.
Until I realized that there are some linker flags that are added to the native Xcode project when initializing the Pod and installing the MediaPipeTasksVision.framework and MediaPipeTasksCommon.framework, there seems to be some scripts that run when compiling that add those extra linker flags to the Build Settings Tab. The main linker flag I was missing was:
Apparently this linker flag is needed when working with libraries that are written in C++ and it forces the compiler to link all the symbols associated with the library.
Now I can compile and run the B4i project directly from Xcode and the library doesn't give me the error anymore, also I had to unlink the file from the Build Phase tab, otherwise I would get an error saying there were duplicate symbols.
Now my question is the following, given that I need to add those linker flags to the project, is there a way to add this linker flags through B4i, my guess is NO, as I haven't found anything relating to this in the forums, but was wondering given that this is a community full of very smart people, how can we figure this out, hopefully @Erel has some additional insight regarding this, but I really need to deliver this project to my client, I have tried setting that linker flags in the b4i library wrapper xcode project, but it seems that when the app gets compiled B4i clears those linker flags, hence the need to add them manually, the problem with this is that when I need to make changes to the library wrapper, or add more functions and I need to recompile then I need to set the linker flags manually again.
Any thought, suggestions and ideas are welcome, hopefully this helps someone else who comes across this issue.
Thank you all.
