With the release of M1 Macs, this assumption no longer holds true - an ARM64 slice can now be meant for either. This found reflection in fat (universal) binaries being a widely used hack for distributing frameworks for Apple platforms that could be used both for devices and simulators. Historically, the ARM/x86 bifurcation in the Apple product line meant that one could safely assume that code built for i386 and x86_64 was meant for the Simulator, and code built for armv7 and arm64 was meant for native devices. ld complains that we are attempting to link in a binary that was compiled for native ARM64 to a binary that is being built for iOS Simulator ARM64. The error we receive isn’t actually a compiler error - it’s a linker error.

Let’s take a look at the error message again. What follows is a detailed explanation of the ARM64 transmogrification.

You can find the complete sources for arm64-to-sim on GitHub. On the way, I learnt a lot about frameworks, binaries, and loaders. With the binary release not updated for over a year, I had to find a way to hack the native ARM64 binary to run in the Simulator. Last week, I ran into this issue with Spotify’s iOS SDK. You seemingly hit a dead end and development on an M1 Mac will be very difficult for time being. This means no Simulator builds and no local unit and UI tests. Since you likely do not have sources for the original library, you cannot rebuild it yourself either. Commonly, the third-party vendor is slow to react, or you are pinning to a previous major version of the framework for compatibility reasons. There is a lot of reasons why you might not get your hands on that updated framework anytime soon - or even at all. Apple’s advice in this situation is to reach out to the vendor and ask them to release an updated version of the framework - both by migrating it to an XCFramework format, and by rebuilding it to support M1 simulators. In plain English, the proprietary binary framework you’ve been using in your project has not been updated to support iOS Simulator running on M1 Macs. /amework/SpotifyiOS(MPMessagePackReader.o), building for iOS Simulator, but linking in object file built for iOS, file '././amework/SpotifyiOS' for architecture arm64Ĭlang: error: linker command failed with exit code 1 (use -v to see invocation)

Arm64 emulator mac