zld
zld copied to clipboard
michaeleisel
zld fails to link (or fallbacks to ld) when linking Watch app with bitcode enabled
/Applications/Xcode-12.0.0-gm-seed.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -target arm64-apple-watchos7.0-simulator -isysroot /Applications/Xcode-12.0.0-gm-seed.app/Contents/Developer/Platforms/WatchSimulator.platform/Developer/SDKs/WatchSimulator7.0.sdk -L/Users/admin/Library/Developer/Xcode/DerivedData/App2-cncnyrokyfrdldfczjlkcqyvxcfc/Build/Products/Debug-watchsimulator -F/Users/admin/Library/Developer/Xcode/DerivedData/App2-cncnyrokyfrdldfczjlkcqyvxcfc/Build/Products/Debug-watchsimulator -filelist /Users/admin/Library/Developer/Xcode/DerivedData/App2-cncnyrokyfrdldfczjlkcqyvxcfc/Build/Intermediates.noindex/App2.build/Debug-watchsimulator/App2\ WatchKit\ Extension.build/Objects-normal/arm64/App2\ WatchKit\ Extension.LinkFileList -Xlinker -rpath -Xlinker @executable_path/Frameworks -Xlinker -rpath -Xlinker @executable_path/../../Frameworks -dead_strip -Xlinker -object_path_lto -Xlinker /Users/admin/Library/Developer/Xcode/DerivedData/App2-cncnyrokyfrdldfczjlkcqyvxcfc/Build/Intermediates.noindex/App2.build/Debug-watchsimulator/App2\ WatchKit\ Extension.build/Objects-normal/arm64/App2\ WatchKit\ Extension_lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -Xlinker -objc_abi_version -Xlinker 2 -fembed-bitcode-marker -fapplication-extension -fobjc-link-runtime -L/Applications/Xcode-12.0.0-gm-seed.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/watchsimulator -L/usr/lib/swift -Xlinker -add_ast_path -Xlinker /Users/admin/Library/Developer/Xcode/DerivedData/App2-cncnyrokyfrdldfczjlkcqyvxcfc/Build/Intermediates.noindex/App2.build/Debug-watchsimulator/App2\ WatchKit\ Extension.build/Objects-normal/arm64/App2_WatchKit_Extension.swiftmodule -fuse-ld=/tmp/zld-09ea158 -Wl,-zld_original_ld_path,/Applications/Xcode-12.0.0-gm-seed.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld -e _WKExtensionMain -framework WatchKit -Xlinker -sectcreate -Xlinker __TEXT -Xlinker __entitlements -Xlinker /Users/admin/Library/Developer/Xcode/DerivedData/App2-cncnyrokyfrdldfczjlkcqyvxcfc/Build/Intermediates.noindex/App2.build/Debug-watchsimulator/App2\ WatchKit\ Extension.build/App2\ WatchKit\ Extension.appex-Simulated.xcent -Xlinker -dependency_info -Xlinker /Users/admin/Library/Developer/Xcode/DerivedData/App2-cncnyrokyfrdldfczjlkcqyvxcfc/Build/Intermediates.noindex/App2.build/Debug-watchsimulator/App2\ WatchKit\ Extension.build/Objects-normal/arm64/App2\ WatchKit\ Extension_dependency_info.dat -o /Users/admin/Library/Developer/Xcode/DerivedData/App2-cncnyrokyfrdldfczjlkcqyvxcfc/Build/Intermediates.noindex/App2.build/Debug-watchsimulator/App2\ WatchKit\ Extension.build/Objects-normal/arm64/Binary/App2\ WatchKit\ Extension
ld: in '/usr/lib/system/libsystem_kernel.dylib', building for watchOS Simulator, but linking in .tbd file (/usr/lib/system/libsystem_kernel.dylib) built for macOS/Mac Catalyst, for architecture arm64 clang: error: linker command failed with exit code 1 (use -v to see invocation)
this is arm64_32? zld will probably never link it on its own unless apple chooses to release the source for arm64_32 linking (no idea why they won't)
looking closer, i guess it's not arm64_32, the target says arm64-apple-watchos7.0-simulator. why would the simulator use arm64? is this a new arm mac? my watchos knowledge is limited
No, it's an Intel Mac. Not a watchOS expert here either, but what I'm seeing is that when you build your parent iOS app for a simulator (x86_64), Xcode builds a universal binary watchOS app that combines two archs x86_64 and arm64.
i thought watchos only used arm64_32 and armv7k, does it also now use arm64?
No idea, I'm guessing that's because the watch simulator on an Apple Silicon would use arm64?
Diffing the build commands, this flag was what makes it fail (it is added when you set ENABLE_BITCODE = YES in the watch target):
-fembed-bitcode-marker