Is there any way to find out what line is triggering the warning
ld: warning: linking against a dylib which is not safe for use in application extensions
I went through my package code and I couldn't find any API unsafe for application extensions
I don’t have any useful insight into to the SPM aspect of this (sorry) but I can answer this:
Is there any way to find out what line is triggering the warning
It’s not a line of code but rather the presence of a framework or library that’s marked as being unsafe for an appex. Consider this:
% otool -h libSafe.dylib
libSafe.dylib:
… flags
… 0x02100085
% otool -h libUnsafe.dylib
libUnsafe.dylib:
… flags
… 0x00100085
The first library is appex safe, and so MH_APP_EXTENSION_SAFE is set in its flags.
Once you know what library is appex unsafe, you can then nm -m to find out what symbols you’re using from it.
Share and Enjoy
Quinn “The Eskimo!” @ DTS @ Apple
6 Likes
Hi! I'm on Xcode 13.0(13A233) and I still have "Linking against a dylib which is not safe for use in application extensions" warnings.
Even linking against a package with only this code gets an error
public func foo() {
print(1)
}
Can you take a look at my otool output?
otool -h libLibTest.dylib
libLibTest.dylib:
Mach header
magic cputype cpusubtype caps filetype ncmds sizeofcmds flags
0xfeedfacf 16777223 3 0x00 6 18 2840 0x00100085
nm -m libLibTest.dylib output
nm -m libLibTest.dylib
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What can be unsafe here?
I no longer had the issue since it was fixed in the beta. Make sure you are using the right command line tools using Xcode-select or via the Xcode settings.
I have the same version without any issue. Did you try to clear any build cache ? Maybe one of your package has not been rebuilt since you updated to a fixed toolchain, I guess it could be in a dependency too.
I've updated a week ago or so. I've tried cleaning the derived data folder, reset package versions, resolve package versions and rebuild the app. At first, I thought that it might be connected with the fact that I develop SPM modules for my project as a git submodule. Then, I checked, and I can confirm that other libs produce this error too
I can cofirm same behaviour. I tryed everything. Nothing helps. For watch app is SPM package automatically marked as unsafe..
I'm still able to reproduce the issue with Xcode 13.2 beta 1.
1 Like
Xcode 13.2 beta 2 did not resolve the issue for me, unfortunately. I can still reproduce it with my sample project (watch app + dynamic package).
I was able to silence the warnings by adding "-Xlinker -no_application_extension" to OTHER_LDFLAGS in my project settings. Alternatively, you can also specify this setting in your Package.swift file:
linkerSettings: [
.unsafeFlags(["-Xlinker", "-no_application_extension"])
]),
I will report back if I encounter any issues with this workaround.
2 Likes
I also have this problem, and I don't understand how the linker option "-no_application_extension" can help me to get rid of the warning.
My project setup is (a bit simplified) like this: I have an iOS app with an app extension, let's call them MyApp and MyAppExtension. I also have a framework project, let's call it MyFramework. MyFramework is linked to the Swift Package AppAuth, specifically the target AppAuthCore which is safe for app extensions.
MyFramework is marked as safe for app extensions, and is itself linked to MyApp and MyAppExtension, as a dynamic library. The MyApp and MyFramework projects are part of a workspace in Xcode.
Now when I build the MyApp target in the workspace, I get the warning about linking to a library that is not safe for app extensions. This warning is from the linker when linking AppAuthCore to MyFramework. (Interesting side note: I do not get the warning when I just open the MyFramework project and build just that target.)
However, when I add the linker flag "-no_application_extension" to the MyFramework project, I do not get the warning for MyFramework. Instead, I get the warning when linking MyFramework to MyAppExtension. Because that linker flag, if I understand correctly, explicitly sets the framework as not safe for app extensions. But I do need to use it with an app extension, and it should be safe.
What am I missing here?
I can't believe that was the issue. Thank you.
I can still reproduce this issue in the latest Xcode 13.2.1. I haven't encountered any issues with my workaround so far.
@holgerde You probably need to set this flag in both your app extension target and your framework target. This is how it looks in my project:
I've found the -no_application_extension flag in the man page of the ld command:
-no_application_extension
Specifies that the code is being linked is not safe for use in an application extension. For instance, can be used when
creating a framework that should not be used in an application extension.
Was this ever fixed? We are having this issue on Xcode 13.3.1...
Not fixed yet. The warning is still present in Xcode 14.0 beta 1.
We ran into an issue with our library when adding tvOS support. This is on Xcode 13.2.1. We suspect that the changes weren't reverted for the tvOSApplicationExtension case. I have filed a ticket here: Feedback Assistant
In Xcode 13.4.1, I'm still getting this warning.
I found a promising almost-solution:
linkerSettings: [
.unsafeFlags(["-fapplication-extension"])
]
Putting this in my Swift package gets rid of the warning about that particular Swift package.
However due to a bizarre Xcode bug where the unsafe flags of any Swift package will override the proeject settings of any Xcode projects that link to them, now my app and other frameworks that depend on this package are acting like the APPLICATION_EXTENSION_API_ONLY flag is set to YES when really it's set to NO.
Apple really needs to open-source Xcode... it's ridiculous that these bugs persist for year after year. The problem with closed-source is that it results in managers deciding which bugs get fixed, and well, here we are.
Note: my package doesn't even use any UIApplication methods.
The only thing remotely that could maybe qualify as not proper for App Extensions might be DispatchQueue.main? But I removed that and the error doesn't go away.
The warning does even say which line of code is supposedly unsafe to use in an application extension.
I'm not sure what good this would do, since Xcode already believes my package is not safe for application extensions. Yet none of the code in it is actually unsafe. What we need is the opposite of this: a way to declare that the Swift Package is safe without that setting being inherited by anything that links to the package.
Note: I confirm the following have no effect (the flags do get added in the compile steps but they do not result in the warning going away):
swiftSettings: [
.define("APPLICATION_EXTENSION_API_ONLY=YES"),
.unsafeFlags(["-application-extension"]),
],
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You could think that adding the -fapplication-extension flag to the linker settings of your target (to get rid of the warning) while at the same time setting the -no_application_extension flag on the Other Linker Flags of your app target (to avoid raising warnings if you link your app to other frameworks that are not available for use in app extensions) would get you the expected behaviour.
Unfortunately, after test, it actually disables completely any linker check. Your framework would be marked as safe for use in app extensions yet could still call UIApplication.shared without the linker raising an eyebrow...
Is there a way to specify
swiftSettings: [
.define("APPLICATION_EXTENSION_API_ONLY=YES"),
]),
We figured out to use
swiftSettings: [
.unsafeFlags(["-Xfrontend", "-application-extension"])
],
linkerSettings: [
.unsafeFlags(["-Xlinker", "-application_extension"])
]
The first setting is for giving you a nice red compile error in Xcode on the spot if you try to use some unsafe API. The second setting tells the linker 'this is an extension safe package' so you won't get warnings if you link the package to an extension target or another framework that is extension safe.