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## Usage

First, build protobuf and nanopb
```
cd firebase-ios-sdk
mkdir -p build
cd build
cmake ..
make -j protobuf nanopb
```

Next, build the protos:
```
cd firebase-ios-sdk/Firestore/Protos
./build-protos.sh
```

Verify diffs, tests and make PR

### Script Details

Get the protoc and the gRPC plugin. See
[here](https://github.com/grpc/grpc/tree/master/src/objective-c). The
easiest way I found was to add
`pod '!ProtoCompiler-gRPCPlugin'` to a Podfile and do `pod update`.

After running the protoc, shell commands run to fix up the generated code:
  * Flatten import paths for CocoaPods library build.
  * Remove unneeded extensionRegistry functions.
  * Remove non-buildable code from Annotations.pbobjc.*.