[bazel] Move clang-fuzzer to separate package (#170167)

This avoids needing to pull in protobuf deps for clang-fuzzer when that
is not needed.

Recently requested: #168928

Previously requested: #123126 / #123833

Author: rupprecht

utils/bazel/llvm-project-overlay/clang/BUILD.bazel

@@ -2,8 +2,6 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-load("@com_google_protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
-load("@com_google_protobuf//bazel:proto_library.bzl", "proto_library")
 load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library")
 load("@rules_python//python:defs.bzl", "py_binary")
 load(
@@ -2493,64 +2491,3 @@ cc_library(
         "//llvm:TargetParser",
     ],
 )
-
-cc_binary(
-    name = "clang-fuzzer-dictionary",
-    srcs = ["tools/clang-fuzzer/dictionary/dictionary.c"],
-    deps = [":basic"],
-)
-
-genrule(
-    name = "fuzzer-dictionary",
-    outs = ["fuzzer-dictionary.txt"],
-    cmd = "$(location :clang-fuzzer-dictionary) > $@",
-    tools = [":clang-fuzzer-dictionary"],
-)
-
-cc_library(
-    name = "handle-cxx",
-    srcs = ["tools/clang-fuzzer/handle-cxx/handle_cxx.cpp"],
-    hdrs = ["tools/clang-fuzzer/handle-cxx/handle_cxx.h"],
-    deps = [
-        ":codegen",
-        ":frontend",
-        ":lex",
-        ":tooling",
-        "//llvm:Option",
-        "//llvm:Support",
-    ],
-)
-
-proto_library(
-    name = "cxx-proto",
-    srcs = ["tools/clang-fuzzer/cxx_proto.proto"],
-)
-
-cc_proto_library(
-    name = "cxx_cc_proto",
-    deps = [":cxx-proto"],
-)
-
-cc_library(
-    name = "proto-to-cxx-lib",
-    srcs = ["tools/clang-fuzzer/proto-to-cxx/proto_to_cxx.cpp"],
-    hdrs = ["tools/clang-fuzzer/proto-to-cxx/proto_to_cxx.h"],
-    includes = ["tools/clang-fuzzer"],
-    deps = [":cxx_cc_proto"],
-)
-
-cc_binary(
-    name = "clang-proto-to-cxx",
-    srcs = ["tools/clang-fuzzer/proto-to-cxx/proto_to_cxx_main.cpp"],
-    deps = [":proto-to-cxx-lib"],
-)
-
-cc_library(
-    name = "clang-fuzzer-initialize",
-    srcs = ["tools/clang-fuzzer/fuzzer-initialize/fuzzer_initialize.cpp"],
-    hdrs = ["tools/clang-fuzzer/fuzzer-initialize/fuzzer_initialize.h"],
-    deps = [
-        "//llvm:Core",
-        "//llvm:Support",
-    ],
-)

utils/bazel/llvm-project-overlay/clang/tools/clang-fuzzer/BUILD.bazel

@@ -0,0 +1,70 @@
+# This file is licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+load("@com_google_protobuf//bazel:cc_proto_library.bzl", "cc_proto_library")
+load("@com_google_protobuf//bazel:proto_library.bzl", "proto_library")
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library")
+
+package(default_visibility = ["//visibility:public"])
+
+cc_binary(
+    name = "clang-fuzzer-dictionary",
+    srcs = ["dictionary/dictionary.c"],
+    deps = ["//clang:basic"],
+)
+
+genrule(
+    name = "fuzzer-dictionary",
+    outs = ["fuzzer-dictionary.txt"],
+    cmd = "$(location :clang-fuzzer-dictionary) > $@",
+    tools = [":clang-fuzzer-dictionary"],
+)
+
+cc_library(
+    name = "handle-cxx",
+    srcs = ["handle-cxx/handle_cxx.cpp"],
+    hdrs = ["handle-cxx/handle_cxx.h"],
+    deps = [
+        "//clang:codegen",
+        "//clang:frontend",
+        "//clang:lex",
+        "//clang:tooling",
+        "//llvm:Option",
+        "//llvm:Support",
+    ],
+)
+
+proto_library(
+    name = "cxx-proto",
+    srcs = ["cxx_proto.proto"],
+)
+
+cc_proto_library(
+    name = "cxx_cc_proto",
+    deps = [":cxx-proto"],
+)
+
+cc_library(
+    name = "proto-to-cxx-lib",
+    srcs = ["proto-to-cxx/proto_to_cxx.cpp"],
+    hdrs = ["proto-to-cxx/proto_to_cxx.h"],
+    includes = ["."],
+    deps = [":cxx_cc_proto"],
+)
+
+cc_binary(
+    name = "clang-proto-to-cxx",
+    srcs = ["proto-to-cxx/proto_to_cxx_main.cpp"],
+    deps = [":proto-to-cxx-lib"],
+)
+
+cc_library(
+    name = "clang-fuzzer-initialize",
+    srcs = ["fuzzer-initialize/fuzzer_initialize.cpp"],
+    hdrs = ["fuzzer-initialize/fuzzer_initialize.h"],
+    deps = [
+        "//llvm:Core",
+        "//llvm:Support",
+    ],
+)