Hot Reload Complete but no Changes Appears

[dels21]

Hi John,

I'm having similar issue to this issue:
#110

The thing is i use a local package with an extension of .xcframework.
I tried adding "-interposable" linker to the lib before it is compiled and what i find is:

• In a sample project (more simple + does not use CocoaPods) -> The Injection Next work and the Changes appears
• In my project (more complex + use CocoaPods) -> I got an error:
  🔥 ℹ️ No symbols replaced, have you added -Xlinker -interposable to your project's Debug configuration "Other Linker Flags"?
  🔥 ✅ Hot reload complete - Rebound 0 symbols, classes []

Does this mean i need to add "-Xlinker" and "-interposable" in all of my Cocoapods target?

Or is it because i added the "-interposable" flag right before i compile the framework?

Notes: I didn't add "-Xlinker" in my local package as i got an error stating that i can not add "-Xlinker" to a build.gradle.kts.

Thankyou in advance

[johnno1962]

Without seeing your project there isn't much I can say except you need to find a way to have -Xlinker -interposable applied to the file you want to inject as it links. This makes symbols indirect so they can be rebound. For swift packages you need to add this to your manifest for the target containing the file you want to inject.

    linkerSettings: [
        .unsafeFlags(["-Xlinker", "-interposable"],
                     .when(configuration: .debug))
    ]

[dels21]

Hey John, sorry for the late reply

Thankyou for the insight, I wanna make sure by "you have -Xlinker -interposable applied to the file you want to inject as it links", does that include every PodFile's Target?

Because i tried adding -Xlinker and -interposable into my XCFramework then adding it to my current project (use Podfile).
Then i tried injecting:

• file that only import UIKit -> This works just fine
• file that import any Podfile Target -> It produces the same error that i mentioned before

[johnno1962]

Not being familiar with your project I can only provide you with enough information to hopefully resolve the issue yourself. Assuming you're not wanting to inject the method of a class which is different, InjectionNext rebinds a symbol using https://github.com/facebook/fishhook the hot page of which has a lot (perhaps too much) information about what is going on. The principle is simple though, when you link with "interposing" every function dispatch is made indirect where the address of the callee is read from a writable segment of memory allowing you to "rebind" function dispatch (top level functions and all struct methods). With frameworks it a bit more complicated but to be able to rebind a symbol inside a framework the framework needs to be linked with -interposable or if you calling a function in a framework from outside the framework this should happen automatically. You can set an environment variable INJECTION_DETAIL to get a better idea about what steps are being applied and if the code detects nothing has been rebound you get the error you're seeing.

This could still be a limitation of Injection and if you're able to provide a small project that replicates the problem preferably not using cocoa pods which I don't have installed or one that has already been resolved/updated that would help me look at it. If you could get back a bit more quickly that would help in case I need to hold back an open release to include a fix.

[dels21]

Hey John!

Thankyouu i will look more into the fishhook

And update in think i find something and turns out it does not relate to adding linker to the Podfile target

So the thing is my project is a .xcworkspace and when i try:

• Inject file within the Main App -> it got the error i mentioned before
• Inject file within other Module -> it works just find

i might need a little more time to pin point the problem.
I'll try making a demo app that replicates the problem and get back to you later, but i think it'll take awhile

[johnno1962]

Check in your build logs the -Xlinker -interposable option is added to the link of your main bundle (or it's .debug.dylib file)

[johnno1962]

Another thing to check would be, what does this print:

        print(Bundle.main.executablePath)

[dels21]

Hey John,

Check in your build logs the -Xlinker -interposable option is added to the link of your main bundle (or it's .debug.dylib file)
After checking the logs, i find that the -Xlinker -interposable is added to the link of my main bundle.
And i try finding the .debug.dylib file in terminal using this commands:
find ~/Library/Developer/Xcode/DerivedData -name "*.debug.dylib"

but it returns nothing, does this means that the .debug.dylib does not exist?

Another thing to check would be, what does this print: print(Bundle.main.executablePath)
/private/var/containers/Bundle/Application/84043C43-D3AA-433B-AF17-781F2E9A10C1/MyApp.app/MyApp
this is the executablePath of my project

[johnno1962]

Can you GoogleMeet/TeamView/Zoom/Whatever on this at some point? It's strange you're not seeing .debug.dylibs.

[johnno1962]

HI, are you using Xcode 26.3 by any chance. I just noticed they renamed the .debug.dylib file to __preview.dylib. There is already a new release candidate that supports this https://github.com/johnno1962/InjectionNext/releases/tag/1.5.4RC3.

[dels21]

Hi John sorry for the late reply,

I use XCode 26.2, I'll give the release a try! :)

And I've been trying to reproduce the error in a sample project but I haven't had much time to look more into it.
I will inform you of the progress, and if the error still occurs, do you mind if I follow you up when I can reproduce the error in a sample project?

Thankyouu so much in advance!

[johnno1962]

Thanks for getting back. TBH I thought I had found the problem but that doesn't seem to be the case. Any further information you can provide let me know. It seems to be specific to your project but It's difficult to know what is the fly in the ointment.