I have a framework that I produced with gomobile. I have written up most of my detail in this issue. It may have to do with Xcode/ld, but I have a different version of the framework that does compile. I am not sure this is entirely go (although it does seem like it) so I thought I should put a stack overflow q up. The output of file is listed in the issue but I will put it here as well:
$ file Hello.framework/Hello
Hello.framework/Hello: Mach-O universal binary with 4 architectures: [arm_v7:current ar archive] [arm64]
Hello.framework/Hello (for architecture armv7): current ar archive
Hello.framework/Hello (for architecture i386): current ar archive
Hello.framework/Hello (for architecture x86_64): current ar archive
Hello.framework/Hello (for architecture arm64): current ar archive
ld is not happy with the file.
Warning ignoring file ./Hello.framework/Hello, file is universal (4 slices) but does not contain the x86_64 architecture: ./Hello.framework/Hello