Error when trying to link fat binary with 64-bit simulator target

I have a static library lipo'd for iOS and OS X with 5 architectures (x86_64, i386, armv7, armv7s, arm64).

• The x86_64 architecture was built using the macosx SDK
• The i386 architecture was built using the iphonesimulator SDK
• The ARM architectures were built using the iphoneos SDK

When I try to link the resulting library in an example App it works when building for a device or for a 32-bit iOS simulator target. But when I try to build it for a 64-bit iOS simulator target I get a linker error:

ld: framework not found CoreServices for architecture x86_64

If I remove the x86_64 slice from the fat library it works for all devices and simulators.

I assume it's because the linker prefers the x86_64 architecture if it's there for the 64-bit simulator. But since it was compiled and linked for the macosx SDK it has the OS X dependencies somehow encoded.

I tried adding a second x68_64 slice for the iphonesimulator SDK but lipo won't let me. Also I tried to find a way to make the simulator use the i386 architecture even for 64-bit builds, but so far no luck.

If absolutely necessary I can create 2 binaries which would solve this but I would really prefer having them in one file. Is there a way to achieve this?

I solved it by only building it for the iOS device and simulator. The 64bit slice of the iOS Simulator SDK equally works for iOS and OS X targets, provided you don't need any other frameworks than what's shared between OS X and iOS (Foundation only in my case).