[bazel] Migrate LLVM_VERSION stuff to llvm_config_defines

[chapuni]

Summary

It would be smarter if the BUILD phase could generate llvm-config.h.
Since I am afraid of the discussion in D126581, I just remove
LLVM_VERSION stuff out of the static llvm-config.h.

[bazel] Define LLD_VERSION_STRING with vars.bzl.

[bazel] Define CLANG_VERSION stuff with vars.bzl

[chapuni]

I failed to add all essential commits in it. Will redo.

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

 # 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("@bazel_skylib//rules:expand_template.bzl", "expand_template")
 load("//llvm:tblgen.bzl", "gentbl")
 load("//llvm:binary_alias.bzl", "binary_alias")
 load("//llvm:cc_plugin_library.bzl", "cc_plugin_library")
 
+load(
+    "//:vars.bzl",
+    "LLVM_VERSION",
+    "LLVM_VERSION_MAJOR",
+    "LLVM_VERSION_MINOR",
+    "LLVM_VERSION_PATCH",
+)
+
 package(
     default_visibility = ["//visibility:public"],
 )
 
 licenses(["notice"])
 
 exports_files([
     "tools/clang-format/clang-format.el",

 exports_files(
     glob(["include/**/*.td"]),
 )
 
 genrule(
     name = "basic_version_gen",
     outs = ["include/clang/Basic/Version.inc"],
     cmd = (
-        "echo '#define CLANG_VERSION 16.0.0' >> $@\n" +
-        "echo '#define CLANG_VERSION_MAJOR 16' >> $@\n" +
-        "echo '#define CLANG_VERSION_MINOR 0' >> $@\n" +
-        "echo '#define CLANG_VERSION_PATCHLEVEL 0' >> $@\n" +
-        "echo '#define CLANG_VERSION_STRING \"16.0.0\"' >> $@\n"
+        "echo '#define CLANG_VERSION "+LLVM_VERSION+"' >> $@\n" +
+        "echo '#define CLANG_VERSION_MAJOR "+LLVM_VERSION_MAJOR+"' >> $@\n" +
+        "echo '#define CLANG_VERSION_MINOR "+LLVM_VERSION_MINOR+"' >> $@\n" +
+        "echo '#define CLANG_VERSION_PATCHLEVEL "+LLVM_VERSION_PATCH+"' >> $@\n" +
+        "echo '#define CLANG_VERSION_STRING \""+LLVM_VERSION+"\"' >> $@\n"
     ),
 )
 
 cc_library(
     name = "config",
     hdrs = [
         "include/clang/Basic/Version.inc",
         "include/clang/Config/config.h",
     ],
+    defines = [
+        r'BACKEND_PACKAGE_STRING=\"LLVM\ '+LLVM_VERSION+r'git\"',
+    ],
     includes = ["include"],
     deps = [
         # We rely on the LLVM config library to provide configuration defines.
         "//llvm:config",
     ],
 )
 
 # TODO: This should get replaced with something that actually generates the

utils/bazel/llvm-project-overlay/clang/include/clang/Config/config.h

 /*===------- clang/Config/config.h - llvm configuration -----------*- C -*-===*/
 /*                                                                            */
 /* Part of the LLVM Project, 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                    */
 /*                                                                            */
 /*===----------------------------------------------------------------------===*/

 
 /* Define if we have libxml2 */
 /* #undef CLANG_HAVE_LIBXML */
 
 /* Define if we have sys/resource.h (rlimits) */
 /* CLANG_HAVE_RLIMITS defined conditionally below */
 
 /* The LLVM product name and version */
-#define BACKEND_PACKAGE_STRING "LLVM 16.0.0git"
+/* #undef BACKEND_PACKAGE_STRING */
 
 /* Linker version detected at compile time. */
 /* #undef HOST_LINK_VERSION */
 
 /* pass --build-id to ld */
 /* #undef ENABLE_LINKER_BUILD_ID */
 
 /* enable x86 relax relocations by default */

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

 # 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("@bazel_skylib//rules:expand_template.bzl", "expand_template")
 load("//llvm:tblgen.bzl", "gentbl")
 
+load(
+    "//:vars.bzl",
+    "LLVM_VERSION",
+)
+
 package(
     default_visibility = ["//visibility:public"],
 )
 
 licenses(["notice"])
 
 # TODO: Actually compute version info
 genrule(
     name = "config_version_gen",
     outs = ["include/lld/Common/Version.inc"],
-    cmd = "echo '#define LLD_VERSION_STRING \"16.0.0\"' > $@",
+    cmd = "echo '#define LLD_VERSION_STRING \""+LLVM_VERSION+"\"' > $@",
 )
 
 genrule(
     name = "vcs_version_gen",
     outs = ["Common/VCSVersion.inc"],
     cmd = "echo '#undef LLD_REVISION' >> $@\n" +
           "echo '#undef LLD_REPOSITORY' >> $@\n",
 )

utils/bazel/llvm-project-overlay/llvm/config.bzl

 # 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
 
 """Defines variables that use selects to configure LLVM based on platform."""
 
+load(
+    "//:vars.bzl",
+    "LLVM_VERSION",
+    "LLVM_VERSION_MAJOR",
+    "LLVM_VERSION_MINOR",
+    "LLVM_VERSION_PATCH",
+)
+
 def native_arch_defines(arch, triple):
     return [
         r'LLVM_NATIVE_ARCH=\"{}\"'.format(arch),
         "LLVM_NATIVE_ASMPARSER=LLVMInitialize{}AsmParser".format(arch),
         "LLVM_NATIVE_ASMPRINTER=LLVMInitialize{}AsmPrinter".format(arch),
         "LLVM_NATIVE_DISASSEMBLER=LLVMInitialize{}Disassembler".format(arch),
         "LLVM_NATIVE_TARGET=LLVMInitialize{}Target".format(arch),
         "LLVM_NATIVE_TARGETINFO=LLVMInitialize{}TargetInfo".format(arch),
llvm_config_defines = os_defines + select({
     "@bazel_tools//src/conditions:windows": native_arch_defines("X86", "x86_64-pc-win32"),
     "@bazel_tools//src/conditions:darwin_arm64": native_arch_defines("AArch64", "arm64-apple-darwin"),
     "@bazel_tools//src/conditions:darwin_x86_64": native_arch_defines("X86", "x86_64-unknown-darwin"),
     "@bazel_tools//src/conditions:linux_aarch64": native_arch_defines("AArch64", "aarch64-unknown-linux-gnu"),
     "@bazel_tools//src/conditions:linux_ppc64le": native_arch_defines("PowerPC", "powerpc64le-unknown-linux-gnu"),
     "@bazel_tools//src/conditions:linux_s390x": native_arch_defines("SystemZ", "systemz-unknown-linux_gnu"),
     "//conditions:default": native_arch_defines("X86", "x86_64-unknown-linux-gnu"),
 }) + [
+    "LLVM_VERSION_MAJOR="+LLVM_VERSION_MAJOR,
+    "LLVM_VERSION_MINOR="+LLVM_VERSION_MINOR,
+    "LLVM_VERSION_PATCH="+LLVM_VERSION_PATCH,
+    r'LLVM_VERSION_STRING=\"'+LLVM_VERSION+r'git\"',
     # These shouldn't be needed by the C++11 standard, but are for some
     # platforms (e.g. glibc < 2.18. See
     # https://sourceware.org/bugzilla/show_bug.cgi?id=15366). These are also
     # included unconditionally in the CMake build:
     # https://github.com/llvm/llvm-project/blob/cd0dd8ece8e/llvm/cmake/modules/HandleLLVMOptions.cmake#L907-L909
     "__STDC_LIMIT_MACROS",
     "__STDC_CONSTANT_MACROS",
     "__STDC_FORMAT_MACROS",
 ]

utils/bazel/llvm-project-overlay/llvm/include/llvm/Config/llvm-config.h

 /*===------- llvm/Config/llvm-config.h - llvm configuration -------*- C -*-===*/
 /*                                                                            */
 /* Part of the LLVM Project, 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                    */
 /*                                                                            */
 /*===----------------------------------------------------------------------===*/

 
 /* Define if we have the oprofile JIT-support library */
 #define LLVM_USE_OPROFILE 0
 
 /* Define if we have the perf JIT-support library */
 #define LLVM_USE_PERF 0
 
 /* Major version of the LLVM API */
-#define LLVM_VERSION_MAJOR 16
+/* #undef LLVM_VERSION_MAJOR */
 
 /* Minor version of the LLVM API */
-#define LLVM_VERSION_MINOR 0
+/* #undef LLVM_VERSION_MINOR */
 
 /* Patch version of the LLVM API */
-#define LLVM_VERSION_PATCH 0
+/* #undef LLVM_VERSION_PATCH */
 
 /* LLVM version string */
-#define LLVM_VERSION_STRING "16.0.0git"
+/* #undef LLVM_VERSION_STRING */
 
 /* Whether LLVM records statistics for use with GetStatistics(),
  * PrintStatistics() or PrintStatisticsJSON()
  */
 #define LLVM_FORCE_ENABLE_STATS 0
 
 /* Define if we have z3 and want to build it */
 /* #undef LLVM_WITH_Z3 */