Build notes for arm64 / Apple Silicon

[a-staebler]

Hello,

I managed to get a build working with bazel on Apple Silicon. I'm not very familiar with bazel. Here are the tweaks and shortcuts I took:

• JDK installed with brew install openjdk@11.
• Instruct bazel to use local jdk.
• Work around linker issues and build errors.

This led to the following changes in .bazelrc after build --copt -DGRPC_BAZEL_BUILD:

build --copt=-DBUILD_TESTING=OFF
build --copt=-DABSL_FORCE_THREAD_IDENTITY_MODE=0
build --define=ABSOLUTE_JAVABASE=/opt/homebrew/opt/java11
build --host_javabase=@bazel_tools//tools/jdk:absolute_javabase
build --host_java_toolchain=@bazel_tools//tools/jdk:toolchain_vanilla
build --java_toolchain=@bazel_tools//tools/jdk:toolchain_vanilla
build:macos --features=-supports_dynamic_linker

My goal was to disable test builds but I did not succeed with the first copt line for http client. As a workaround i excluded it based on the test tag. I also had to work around an openssl build error in thrift, so I excluded jaeger.

This lead to the following successful build command:

bazel query '//... except attr(tags, "test|jaeger", //...)' | xargs bazel build

Thanks to @seemk for helping me with the tricky bazel configuration parts.

[a-staebler]

Forgot one critical step: downgrading XCode to 13.2.1 to work around abseil build errors. I used xcpretty/xcode-install.