Fails to compile on iOS

[gBasil]

Keyring doesn't seem to compile to iOS.

When compiling the following repo, which is just the code in the README put into a module: https://github.com/gBasil/keyring-issue-reproduction
with this command:

SDKROOT=$(xcrun --sdk iphoneos --show-sdk-path) \
IPHONEOS_DEPLOYMENT_TARGET=10.0 \
GOOS=ios GOARCH=arm64 CGO_ENABLED=1 \
go build

It prints the these errors:

# github.com/noamcohen97/touchid-go
../../go/pkg/mod/github.com/noamcohen97/touchid-go@v0.3.0/local_authentication_gen.go:54:7: could not determine what C.LAErrorBiometryDisconnected refers to
../../go/pkg/mod/github.com/noamcohen97/touchid-go@v0.3.0/local_authentication_gen.go:62:7: could not determine what C.LAErrorBiometryNotPaired refers to
../../go/pkg/mod/github.com/noamcohen97/touchid-go@v0.3.0/local_authentication_gen.go:64:7: could not determine what C.LAErrorCompanionNotAvailable refers to
../../go/pkg/mod/github.com/noamcohen97/touchid-go@v0.3.0/local_authentication_gen.go:68:7: could not determine what C.LAErrorInvalidDimensions refers to
../../go/pkg/mod/github.com/noamcohen97/touchid-go@v0.3.0/local_authentication_gen.go:24:68: could not determine what C.LAPolicyDeviceOwnerAuthenticationWithBiometricsOrCompanion refers to
../../go/pkg/mod/github.com/noamcohen97/touchid-go@v0.3.0/local_authentication_gen.go:25:68: could not determine what C.LAPolicyDeviceOwnerAuthenticationWithCompanion refers to

touchid-go is a touch library for macOS, so I assume Go is unable to pull the relevant macOS-exclusive headers from the iOS SDK.

My setup is still the same as in #75. SDKROOT in the build command evaluates to /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.2.sdk.

[gBasil]

If you remove the Touch ID-related code from Keyring to fix compilation, you run into a bunch of issues with go-keychain. The ios.go file is missing a lot of the code that exists in the macos.go file, and since iOS doesn't support a lot of the keychain APIs that exist on macOS, you can't just copy over the functionality exactly.

Also, the go-keychain README mentions that there are iOS bindings, but I'm not sure if those are relevant to anything.

[mbevc1]

Looks this might be a cross-compilation for iOS and touch requires some native libs. I wonder if we should remove touch for iOS 🤔

[gBasil]

I think that would be a good idea.

[mbevc1]

Oh, I've just noticed you were linking to go-keychain package. I'd also suggest checking the upstream repo mentioned here: ByteNess/go-keychain#1

[gBasil]

Seemingly no need. I've gotten iOS builds to work, and the only changes needed were for Keyring. I've made a PR: #77