[llvm] [bazel] Add support for LLVM_TOOL_LLVM_DRIVER_BUILD (PR #86879)

[Fangrui Song via llvm-commits]

================
@@ -0,0 +1,182 @@
+# 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
+
+"""Configuration for the llvm-driver tool."""
+
+load("@bazel_skylib//rules:common_settings.bzl", "BuildSettingInfo")
+load("@bazel_skylib//rules:expand_template.bzl", "expand_template")
+
+# Mapping from every tool to the cc_library that implements the tool's entrypoint.
+# TODO: uncomment the remaining targets after splitting them
+# into separate library/binary targets.
+_TOOLS = {
+    # "clang": "//clang:clang-driver",
+    # "clang-scan-deps": "//clang:clang-scan-deps-lib",
+    # "dsymutil": "//llvm:dsymutil-lib",
+    "llvm-ar": "//llvm:llvm-ar-lib",
+    # "llvm-cxxfilt": "//llvm:llvm-cxxfilt-lib",
+    # "llvm-dwp": "//llvm:llvm-dwp-lib",
+    # "llvm-gsymutil": "//llvm:llvm-gsymutil-lib",
+    # "llvm-ifs": "//llvm:llvm-ifs-lib",
+    # "llvm-libtool-darwin": "//llvm:llvm-libtool-darwin-lib",
+    # "llvm-lipo": "//llvm:llvm-lipo-lib",
+    # "llvm-ml": "//llvm:llvm-ml-lib",
+    # "llvm-mt": "//llvm:llvm-mt-lib",
+    "llvm-nm": "//llvm:llvm-nm-lib",
+    # "llvm-objcopy": "//llvm:llvm-objcopy-lib",
+    # "llvm-objdump": "//llvm:llvm-objdump-lib",
+    # "llvm-profdata": "//llvm:llvm-profdata-lib",
+    # "llvm-rc": "//llvm:llvm-rc-lib",
+    # "llvm-readobj": "//llvm:llvm-readobj-lib",
+    "llvm-size": "//llvm:llvm-size-lib",
+    # "llvm-symbolizer": "//llvm:llvm-symbolizer-lib",
+    # "sancov": "//llvm:sancov-lib",
+    # "lld": "//lld:lld-lib",
----------------
MaskRay wrote:

Should the lld comment be moved before the first `//llvm:` for an alphabetical order?

https://github.com/llvm/llvm-project/pull/86879