bazel: Add LLVM toolchain

Signed-off-by: Keith Smiley <[email protected]>
Signed-off-by: Ryan Northey <[email protected]>

Author: keith

.bazelrc

@@ -46,6 +46,9 @@ build --action_env=BAZEL_VOLATILE_DIRTY --host_action_env=BAZEL_VOLATILE_DIRTY
 # Requires setting `BAZEL_FAKE_SCM_REVISION` in the env.
 build --action_env=BAZEL_FAKE_SCM_REVISION --host_action_env=BAZEL_FAKE_SCM_REVISION
 
+# build --incompatible_enable_cc_toolchain_resolution
+
+# build --enable_platform_specific_config
 build --test_summary=terse
 
 # TODO(keith): Remove once these 2 are the default

WORKSPACE

@@ -23,3 +23,7 @@ envoy_python_dependencies()
 load("//bazel:dependency_imports.bzl", "envoy_dependency_imports")
 
 envoy_dependency_imports()
+
+load("@llvm_toolchain//:toolchains.bzl", "llvm_register_toolchains")
+
+llvm_register_toolchains()

bazel/dependency_imports.bzl

@@ -16,6 +16,7 @@ load("@com_github_aignas_rules_shellcheck//:deps.bzl", "shellcheck_dependencies"
 load("@aspect_bazel_lib//lib:repositories.bzl", "register_jq_toolchains", "register_yq_toolchains")
 load("@com_google_cel_cpp//bazel:deps.bzl", "parser_deps")
 load("@com_github_chrusty_protoc_gen_jsonschema//:deps.bzl", protoc_gen_jsonschema_go_dependencies = "go_dependencies")
+load("@com_grail_bazel_toolchain//toolchain:rules.bzl", "llvm_toolchain")
 
 # go version for rules_go
 GO_VERSION = "1.18"
@@ -149,6 +150,11 @@ def envoy_dependency_imports(go_version = GO_VERSION, jq_version = JQ_VERSION, y
 
     protoc_gen_jsonschema_go_dependencies()
 
+    llvm_toolchain(
+        name = "llvm_toolchain",
+        llvm_version = "14.0.0",
+    )
+
 def envoy_download_go_sdks(go_version):
     go_download_sdk(
         name = "go_linux_amd64",

bazel/repositories.bzl

@@ -318,6 +318,7 @@ def envoy_dependencies(skip_targets = []):
     external_http_archive("bazel_toolchains")
     external_http_archive("bazel_compdb")
     external_http_archive("envoy_build_tools")
+    external_http_archive("com_grail_bazel_toolchain")
 
     # TODO(keith): Remove patch when we update rules_pkg
     external_http_archive(

bazel/repositories_extra.bzl

@@ -3,6 +3,7 @@ load("@rules_python//python:repositories.bzl", "python_register_toolchains")
 load("@proxy_wasm_cpp_host//bazel/cargo/wasmtime:crates.bzl", "wasmtime_fetch_remote_crates")
 load("//bazel/external/cargo:crates.bzl", "raze_fetch_remote_crates")
 load("@aspect_bazel_lib//lib:repositories.bzl", "aspect_bazel_lib_dependencies")
+load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")
 
 def _python_minor_version(python_version):
     return "_".join(python_version.split(".")[:-1])
@@ -27,3 +28,4 @@ def envoy_dependencies_extra(
     )
 
     aspect_bazel_lib_dependencies()
+    bazel_toolchain_dependencies()

bazel/repository_locations.bzl

@@ -1446,6 +1446,19 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         license = "Apache-2.0",
         license_url = "https://github.com/bazelbuild/rules_license/blob/{version}/LICENSE",
     ),
+    com_grail_bazel_toolchain = dict(
+        project_name = "com_grail_bazel_toolchain",
+        project_desc = "A LLVM toolchain for bazel",
+        project_url = "https://github.com/grailbio/bazel-toolchain",
+        strip_prefix = "bazel-toolchain-{version}",
+        version = "70a0fb556662fe3cadb07da32c91e232eb0d883d",
+        sha256 = "54570e20b8c94c324b0684998893f730afcc4b12e1ebcec0246c1d0301ae4847",
+        urls = ["https://github.com/grailbio/bazel-toolchain/archive/{version}.tar.gz"],
+        use_category = [],
+        extensions = [],
+        release_date = "2023-01-06",
+        cpe = "N/A",
+    ),
     utf8_range = dict(
         project_name = "utf8_range",
         project_desc = "Fast UTF-8 validation with Range algorithm (NEON+SSE4+AVX2)",