0.9.1 Carthage project does not build successfully on Xcode 12

[banjun]

I have a workaround for this error below. I would like to send a PR on top of 0.9.1 if there's a target branch just on it (such as maintenance/0.9.x).

Describe the bug

On Xcode 12, SwiftGRPC-Carthage.xcodeproj of grpc-swift 0.9.1 does not build successfully.

To reproduce

Xcode: Xcode 12 (Xcode 12.2)

Steps to reproduce the bug you've found:

1. git checkout 0.9.1
2. rm -rf .build # make sure there are no intermediates
3. open SwiftGRPC-Carthage.xcodeproj
4. Build SwiftGRPC-Package

Expected behaviour

the build succeeds

Actual behaviour:

error: Build input files cannot be found: '/Users/user/project/github/grpc-swift/.build/checkouts/swift-protobuf.git-2635211014727342512/Sources/SwiftProtobuf/JSONDecodingOptions.swift', ...

Additional information

The error is caused indirectly by swift package resolve in the build pre-action of SwiftGRPC-Carthage.xcodeproj. An available workaround is here:

• banjun@faaaa23
• banjun@e924a75

I really want to stick with 0.9.1 for the time being before migrating to 1.0.0 to save some time.

[glbrntt]

I have a workaround for this error below. I would like to send a PR on top of 0.9.1 if there's a target branch just on it (such as maintenance/0.9.x).

Thanks for reporting this with a fix @banjun -- you can open a PR targeting the cgrpc branch.

[banjun]

@glbrntt I can try sending a PR to the cgrpc branch but I want a minimum fix to 0.9.1 for now. Would you mind if you create 0.9.2 for the issue?

[glbrntt]

Oh sorry, I incorrectly had it in my head that the 0.x branch was on 0.9.1. Try https://github.com/grpc/grpc-swift/tree/maintenance/0.9.x