Introduce compilation-commands extractor

BUILD.bazel

@@ -1,3 +1,4 @@
+load("@hedron_compile_commands//:refresh_compile_commands.bzl", "refresh_compile_commands")
 load("@rules_license//rules:license.bzl", "license")
 
 package(
@@ -12,3 +13,10 @@ license(
     package_name = "xla",
     license_kinds = ["@rules_license//licenses/spdx:Apache-2.0"],
 )
+
+refresh_compile_commands(
+    name = "refresh_compile_commands",
+    targets = {
+        "//xla/client/lib:math_test_gpu": "--config=rocm",
+    },
+)

WORKSPACE

@@ -52,3 +52,25 @@ xla_workspace1()
 load(":workspace0.bzl", "xla_workspace0")
 
 xla_workspace0()
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+# Hedron's Compile Commands Extractor for Bazel
+# https://github.com/hedronvision/bazel-compile-commands-extractor
+http_archive(
+    name = "hedron_compile_commands",
+
+    # Replace the commit hash (0e990032f3c5a866e72615cf67e5ce22186dcb97) in both places (below) with the latest (https://github.com/hedronvision/bazel-compile-commands-extractor/commits/main), rather than using the stale one here.
+    # Even better, set up Renovate and let it do the work for you (see "Suggestion: Updates" in the README).
+    url = "https://github.com/hedronvision/bazel-compile-commands-extractor/archive/0e990032f3c5a866e72615cf67e5ce22186dcb97.tar.gz",
+    strip_prefix = "bazel-compile-commands-extractor-0e990032f3c5a866e72615cf67e5ce22186dcb97",
+    # When you first run this tool, it'll recommend a sha256 hash to put here with a message like: "DEBUG: Rule 'hedron_compile_commands' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = ..."
+)
+load("@hedron_compile_commands//:workspace_setup.bzl", "hedron_compile_commands_setup")
+hedron_compile_commands_setup()
+load("@hedron_compile_commands//:workspace_setup_transitive.bzl", "hedron_compile_commands_setup_transitive")
+hedron_compile_commands_setup_transitive()
+load("@hedron_compile_commands//:workspace_setup_transitive_transitive.bzl", "hedron_compile_commands_setup_transitive_transitive")
+hedron_compile_commands_setup_transitive_transitive()
+load("@hedron_compile_commands//:workspace_setup_transitive_transitive_transitive.bzl", "hedron_compile_commands_setup_transitive_transitive_transitive")
+hedron_compile_commands_setup_transitive_transitive_transitive()