register llvm tool

Author: zirain

.bazelrc

@@ -14,7 +14,7 @@ build:remote --remote_timeout=7200
 # ========================================
 
 # Enable libc++ and C++20 by default.
-build --repo_env=BAZEL_LLVM_PATH=/usr/lib/llvm
+# build --repo_env=BAZEL_LLVM_PATH=/usr/lib/llvm
 build:linux --config=clang
 
 # put /usr/local/bin before /usr/bin to avoid picking up wrong python3.6 when building envoy.tls.key_providers.cryptomb
@@ -51,8 +51,8 @@ build:debug -c dbg
 build --cxxopt -Wformat
 build --cxxopt -Wformat-security
 
-build:clang --host_action_env=CC=
-build:clang --host_action_env=CXX=
+# build:clang --host_action_env=CC=
+# build:clang --host_action_env=CXX=
 
 # CI sanitizer configuration
 #

WORKSPACE

@@ -81,3 +81,8 @@ envoy_repo()
 load("@envoy//bazel:toolchains.bzl", "envoy_toolchains")
 
 envoy_toolchains()
+
+load("@llvm_toolchain//:toolchains.bzl", "llvm_register_toolchains")
+
+llvm_register_toolchains()
+