screw hermetic toolchains.

.bazelrc

@@ -2,35 +2,20 @@
 common --enable_bzlmod
 
 # Enable modern C++ features.
-build --cxxopt=-std=c++23
-# and modern C features.
-build --copt=-std=gnu17
+build --cxxopt=-std=c++20
+build --conlyopt=-std=gnu17
+
+build --repo_env=CC=clang
+build --repo_env=CXX=clang++
 
 # https://github.com/bazelbuild/bazel/issues/7260
 build --incompatible_enable_cc_toolchain_resolution
-build --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
-
-# Needed for Bazel versions before 7.
-# Without this, one can use `--linkopt='-undefined dynamic_lookup'`.
-# This feature is intentionally not supported on macOS.
-build --features=-supports_dynamic_linker
-# Not needed after https://github.com/grailbio/bazel-toolchain/pull/229.
-build --features=-libtool
-
-build --platforms=@toolchains_llvm//platforms:linux-x86_64
-build --host_platform=@local_config_platform//:host
-build --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux
-
-build --verbose_failures
-build --worker_sandboxing
 
 # Improve performance for hermetic builds.
 # https://github.com/bazelbuild/bazel/issues/8230#issuecomment-1129264658
 # https://github.com/aspect-build/gcc-toolchain/issues/85#issue-1340427935
 build --experimental_reuse_sandbox_directories
 
-build --experimental_output_directory_naming_scheme=diff_against_baseline
-
 # Tests are usually written for the host platform, just simpler to deal with.
 test --platforms=@local_config_platform//:host
 test --test_sharding_strategy=explicit

CONTRIBUTING.md

@@ -115,7 +115,7 @@ prebuilt binaries available for Windows, Linux and macOS. you can find the binar
 
 ## Navigation
 
-To navigate around the codebase, its recommended to
+To navigate around the codebase, it's recommended to
 use [Sourcegraph](https://sourcegraph.com/github.com/bolt-sys/bolt)
 or your IDE's search implementation.
 

MODULE.bazel

@@ -19,35 +19,6 @@ git_override(
     commit = "eca42c63700fccdc49cf58177e0a96f0f6075a68",
 )
 
-#
-# C++ Toolchain
-#
-bazel_dep(name = "toolchains_llvm", version = "0.10.3")
-
-git_override(
-    module_name = "toolchains_llvm",
-    commit = "cba5e70a3318ce535597c782422c9c8afe8ee128",
-    remote = "https://github.com/bolt-sys/bazel-toolchain",
-)
-
-# Configure and register the toolchain.
-llvm = use_extension("@toolchains_llvm//toolchain/extensions:llvm.bzl", "llvm")
-
-llvm.toolchain(
-    llvm_versions = {
-        "": "17.0.6",
-        "darwin-aarch64": "17.0.6",
-        "darwin-x86_64": "15.0.7",
-    },
-    sysroot = {
-        "linux-x86_64": "@@org_chromium_sysroot_linux_x64//:sysroot",
-    },
-)
-
-use_repo(llvm, "llvm_toolchain")
-
-register_toolchains("@llvm_toolchain//:all")
-
 #
 # Testing
 #