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diff --git a/src/objective-c/README.md b/src/objective-c/README.md index 40aba0317b..32e3956a1e 100644 --- a/src/objective-c/README.md +++ b/src/objective-c/README.md @@ -220,3 +220,25 @@ Objective-C Protobuf runtime library. [gRPC install script]:https://raw.githubusercontent.com/grpc/homebrew-grpc/master/scripts/install [example Podfile]:https://github.com/grpc/grpc/blob/master/examples/objective-c/helloworld/Podfile [example apps]: https://github.com/grpc/grpc/tree/master/examples/objective-c + +## Use gRPC with OpenSSL +gRPC uses BoringSSL as its dependency, which is a fork of OpenSSL and export a number of symbols +that are the same as OpenSSL. gRPC avoids conflicts of these symbols by renaming BoringSSL symbols. + +If you need gRPC to use OpenSSL instead of BoringSSL (e.g. for the benefit of reducing the binary +size of your product), you need to make a local `gRPC-Core` podspec and tweak it accordingly: +- Copy the version of `/gRPC-Core.podspec` you wish to use from Github into the repository of your + app; +- In your `Podfile`, add the following line: +``` +pod `gRPC-Core`, :podspec => "." # assuming gRPC-Core.podspec is in the same directory as your Podfile +``` +- Remove [the + macro](https://github.com/grpc/grpc/blob/b24b212ee585d376c618235905757b2445ac6461/gRPC-Core.podspec#L186) + `GRPC_SHADOW_BORINGSSL_SYMBOLS` to disable symbol renaming; +- Substitude the `BoringSSL-GRPC` + [dependency](https://github.com/grpc/grpc/blob/b24b212ee585d376c618235905757b2445ac6461/gRPC-Core.podspec#L184) + to whatever pod of OpenSSL your other libraries use. + +These steps should allow gRPC to use OpenSSL and drop BoringSSL dependency. If you see any issue, +file an issue to us. |