[config] Remove vestigial LLVM_VERSION_INFO

This has been superseded by the llvm/Support/VCSRevision.h header. So
far as I can tell, nothing in the CMake build sets LLVM_VERSION_INFO. It
was always undefined, and the ifdefs using it were dead. However, CMake
is very flexible, so it's possible that I missed some ways to set this
variable. One could, for example, probably pass -DLLVM_VERSION_INFO=x on
the command line and get that through to configure_file, or set the
variable in an obscure way (`set(${proj}_VERSION_INFO "x")`). I'm
reasonably confident that isn't happening, but I'd like a second
opinion.

Update the Bazel and gn builds accordingly.

Differential Revision: https://reviews.llvm.org/D126977

llvm/include/llvm/Config/config.h.cmake

@@ -293,9 +293,6 @@
 /* Define if overriding target triple is enabled */
 #cmakedefine LLVM_TARGET_TRIPLE_ENV "${LLVM_TARGET_TRIPLE_ENV}"
 
-/* LLVM version information */
-#cmakedefine LLVM_VERSION_INFO "${LLVM_VERSION_INFO}"
-
 /* Whether tools show host and target info when invoked with --version */
 #cmakedefine01 LLVM_VERSION_PRINTER_SHOW_HOST_TARGET_INFO
 

llvm/lib/LTO/LTOCodeGenerator.cpp

@@ -66,11 +66,7 @@
 using namespace llvm;
 
 const char* LTOCodeGenerator::getVersionString() {
-#ifdef LLVM_VERSION_INFO
-  return PACKAGE_NAME " version " PACKAGE_VERSION ", " LLVM_VERSION_INFO;
-#else
   return PACKAGE_NAME " version " PACKAGE_VERSION;
-#endif
 }
 
 namespace llvm {

llvm/lib/Support/CommandLine.cpp

@@ -2468,11 +2468,7 @@ class VersionPrinter {
 #else
     OS << "LLVM (http://llvm.org/):\n  ";
 #endif
-    OS << PACKAGE_NAME << " version " << PACKAGE_VERSION;
-#ifdef LLVM_VERSION_INFO
-    OS << " " << LLVM_VERSION_INFO;
-#endif
-    OS << "\n  ";
+    OS << PACKAGE_NAME << " version " << PACKAGE_VERSION << "\n  ";
 #if LLVM_IS_DEBUG_BUILD
     OS << "DEBUG build";
 #else

llvm/utils/gn/secondary/llvm/include/llvm/Config/BUILD.gn

@@ -121,7 +121,6 @@ write_cmake_config("config") {
     "HOST_LINK_VERSION=",
     "LIBPFM_HAS_FIELD_CYCLES=",
     "LLVM_TARGET_TRIPLE_ENV=",
-    "LLVM_VERSION_INFO=",
     "LLVM_VERSION_PRINTER_SHOW_HOST_TARGET_INFO=1",
     "LLVM_WINDOWS_PREFER_FORWARD_SLASH=",
     "PACKAGE_BUGREPORT=https://github.com/llvm/llvm-project/issues/",

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

@@ -93,14 +93,6 @@ enum_targets_gen(
     targets = llvm_target_mcas,
 )
 
-# TODO: Need to replace this with something that actually extracts the git
-# commit from the LLVM source (submodule or http_archive).
-genrule(
-    name = "version_info_gen",
-    outs = ["include/llvm/Config/VersionInfo.h"],
-    cmd = "echo '#define LLVM_VERSION_INFO \"git\"' > $@",
-)
-
 template_rule(
     name = "abi_breaking_h_gen",
     src = "include/llvm/Config/abi-breaking.h.cmake",
@@ -124,7 +116,6 @@ exports_files([
 cc_library(
     name = "config",
     hdrs = [
-        "include/llvm/Config/VersionInfo.h",
         "include/llvm/Config/abi-breaking.h",
         "include/llvm/Config/llvm-config.h",
     ],

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

@@ -309,9 +309,6 @@
 /* Define if overriding target triple is enabled */
 /* #undef LLVM_TARGET_TRIPLE_ENV */
 
-/* LLVM version information */
-/* #undef LLVM_VERSION_INFO */
-
 /* Whether tools show host and target info when invoked with --version */
 #define LLVM_VERSION_PRINTER_SHOW_HOST_TARGET_INFO 1
 

utils/bazel/llvm_configs/config.h.cmake

@@ -293,9 +293,6 @@
 /* Define if overriding target triple is enabled */
 #cmakedefine LLVM_TARGET_TRIPLE_ENV "${LLVM_TARGET_TRIPLE_ENV}"
 
-/* LLVM version information */
-#cmakedefine LLVM_VERSION_INFO "${LLVM_VERSION_INFO}"
-
 /* Whether tools show host and target info when invoked with --version */
 #cmakedefine01 LLVM_VERSION_PRINTER_SHOW_HOST_TARGET_INFO