Update README.md

Explain that the provided toolchain is not hermetic, and point to some options which are.

This was a topic at the Rules Authors SIG meeting on 27 June 2023: https://docs.google.com/document/d/1YGCYAGLzTfqSOgRFVsB8hDz-kEoTgTEKKp9Jd07TJ5c/edit#heading=h.twkfyk2n9ye9
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@ -3,7 +3,7 @@
* Postsubmit [![Build status](https://badge.buildkite.com/f03592ae2d7d25a2abc2a2ba776e704823fa17fd3e061f5103.svg?branch=main)](https://buildkite.com/bazel/rules-cc) * Postsubmit [![Build status](https://badge.buildkite.com/f03592ae2d7d25a2abc2a2ba776e704823fa17fd3e061f5103.svg?branch=main)](https://buildkite.com/bazel/rules-cc)
* Postsubmit + Current Bazel Incompatible flags [![Build status](https://badge.buildkite.com/5ba709cc33e5855078a1f8570adcf8e0a78ea93591bc0b4e81.svg?branch=master)](https://buildkite.com/bazel/rules-cc-plus-bazelisk-migrate) * Postsubmit + Current Bazel Incompatible flags [![Build status](https://badge.buildkite.com/5ba709cc33e5855078a1f8570adcf8e0a78ea93591bc0b4e81.svg?branch=master)](https://buildkite.com/bazel/rules-cc-plus-bazelisk-migrate)
This repository contains Starlark implementation of C++ rules in Bazel. This repository contains a Starlark implementation of C++ rules in Bazel.
The rules are being incrementally converted from their native implementations in the [Bazel source tree](https://source.bazel.build/bazel/+/master:src/main/java/com/google/devtools/build/lib/rules/cpp/). The rules are being incrementally converted from their native implementations in the [Bazel source tree](https://source.bazel.build/bazel/+/master:src/main/java/com/google/devtools/build/lib/rules/cpp/).
@ -37,7 +37,16 @@ cc_library(
# Using the rules_cc toolchain # Using the rules_cc toolchain
If you'd like to use the cc toolchain defined in this repo add this to This repo contains an auto-detecting toolchain that expects to find tools installed on your host machine.
This is non-hermetic, and may have varying behaviors depending on the versions of tools found.
There are third-party contributed hermetic toolchains you may want to investigate:
- LLVM: <https://github.com/grailbio/bazel-toolchain>
- GCC (Linux only): <https://github.com/aspect-build/gcc-toolchain>
- zig cc: <https://github.com/uber/hermetic_cc_toolchain>
If you'd like to use the cc toolchain defined in this repo, add this to
your WORKSPACE after you include rules_cc: your WORKSPACE after you include rules_cc:
```bzl ```bzl