chore: add toolchains for linux arm64

Author: simonresch

.bazelrc

@@ -13,7 +13,9 @@ common --repo_env=CC=clang
 # On Linux, use a hermetic toolchain and sysroot shared between local dev setups and CI.
 # Such a toolchain isn't easily available on macOS or Windows.
 common:linux --repo_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
+# Register hermetic LLVM toolchains for both x86_64 and arm64
 common:linux --extra_toolchains=@llvm_toolchain//:cc-toolchain-x86_64-linux
+common:linux --extra_toolchains=@llvm_toolchain//:cc-toolchain-aarch64-linux
 # Silence protobuf compilation warnings.
 build --copt=-Wno-unused-function
 build --copt=-Wno-unknown-warning-option

MODULE.bazel

@@ -253,7 +253,24 @@ filegroup(
 )
 """,
     sha256 = "84656a6df544ecef62169cfe3ab6e41bb4346a62d3ba2a045dc5a0a2ecea94a3",
-    urls = ["https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2202c161310ffde63729f29d27fe7bb24a0bc540/debian_stretch_amd64_sysroot.tar.xz"],
+    urls = [
+        "https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2202c161310ffde63729f29d27fe7bb24a0bc540/debian_stretch_amd64_sysroot.tar.xz",
+    ],
+)
+
+http_archive(
+    name = "org_chromium_sysroot_linux_aarch64",
+    build_file_content = """
+filegroup(
+  name = "sysroot",
+  srcs = glob(["*/**"]),
+  visibility = ["//visibility:public"],
+)
+""",
+    sha256 = "e39b700d8858d18868544c8c84922f6adfa8419f3f42471b92024ba38eff7aca",
+    urls = [
+        "https://commondatastorage.googleapis.com/chrome-linux-sysroot/toolchain/2202c161310ffde63729f29d27fe7bb24a0bc540/debian_stretch_arm64_sysroot.tar.xz",
+    ],
 )
 
 http_file(
@@ -385,6 +402,7 @@ remote_jdk8_repos = use_extension("//third_party:jdk_8.bzl", "remote_jdk8_repos"
 
 REMOTE_JDK8 = [
     "remote_jdk8_linux",
+    "remote_jdk8_linux_aarch64",
     "remote_jdk8_macos",
     "remote_jdk8_macos_aarch64",
     "remote_jdk8_windows",
@@ -415,6 +433,7 @@ llvm.toolchain(
         # https://github.com/grailbio/bazel-toolchain/issues/234
         # https://github.com/grailbio/bazel-toolchain/pull/235
         "linux-x86_64": "@@_main~_repo_rules~org_chromium_sysroot_linux_x64//:sysroot",
+        "linux-aarch64": "@@_main~_repo_rules~org_chromium_sysroot_linux_aarch64//:sysroot",
     },
 )
 use_repo(llvm, "llvm_toolchain")

third_party/jdk_8.bzl

@@ -56,6 +56,19 @@ def _remote_jdk8_repos(_):
         ],
         version = "8",
     )
+    remote_java_repository(
+        name = "remote_jdk8_linux_aarch64",
+        target_compatible_with = [
+            "@platforms//os:linux",
+            "@platforms//cpu:aarch64",
+        ],
+        integrity = "sha256-xESdKEmfkiE657X/xclwsJR5M+P72BpWErtAcYMcK0Y=",
+        strip_prefix = "zulu8.74.0.17-ca-jdk8.0.392-linux_aarch64",
+        urls = [
+            "https://cdn.azul.com/zulu/bin/zulu8.74.0.17-ca-jdk8.0.392-linux_aarch64.tar.gz",
+        ],
+        version = "8",
+    )
     remote_java_repository(
         name = "remote_jdk8_windows",
         target_compatible_with = [