Index: clang/tools/driver/driver.cpp
===================================================================
--- clang/tools/driver/driver.cpp
+++ clang/tools/driver/driver.cpp
@@ -37,6 +37,7 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/PrettyStackTrace.h"
 #include "llvm/Support/Process.h"
@@ -329,7 +330,7 @@
   return 1;
 }
 
-int clang_main(int Argc, char **Argv) {
+int clang_main(int Argc, char **Argv, const llvm::LLVMDriverExtraArgs &) {
   noteBottomOfStack();
   llvm::InitLLVM X(Argc, Argv);
   llvm::setBugReportMsg("PLEASE submit a bug report to " BUG_REPORT_URL
Index: lld/tools/lld/lld.cpp
===================================================================
--- lld/tools/lld/lld.cpp
+++ lld/tools/lld/lld.cpp
@@ -37,6 +37,7 @@
 #include "llvm/Support/CrashRecoveryContext.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/PluginLoader.h"
 #include "llvm/Support/Process.h"
@@ -212,7 +213,7 @@
   return v;
 }
 
-int lld_main(int argc, char **argv) {
+int lld_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &) {
   InitLLVM x(argc, argv);
   sys::Process::UseANSIEscapeCodes(true);
 
Index: llvm/cmake/modules/llvm-driver-template.cpp.in
===================================================================
--- llvm/cmake/modules/llvm-driver-template.cpp.in
+++ llvm/cmake/modules/llvm-driver-template.cpp.in
@@ -6,6 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-int @TOOL_NAME@_main(int argc, char **argv);
+#include "llvm/Support/LLVMDriver.h"
 
-int main(int argc, char **argv) { return @TOOL_NAME@_main(argc, argv); }
+int @TOOL_NAME@_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &);
+
+int main(int argc, char **argv) { return @TOOL_NAME@_main(argc, argv, {}); }
Index: llvm/include/llvm/Support/LLVMDriver.h
===================================================================
--- /dev/null
+++ llvm/include/llvm/Support/LLVMDriver.h
@@ -0,0 +1,18 @@
+//===- LLVMDriver.h ---------------------------------------------*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_LLVMDRIVER_H
+#define LLVM_SUPPORT_LLVMDRIVER_H
+
+namespace llvm {
+
+struct LLVMDriverExtraArgs {};
+
+} // namespace llvm
+
+#endif
Index: llvm/tools/dsymutil/dsymutil.cpp
===================================================================
--- llvm/tools/dsymutil/dsymutil.cpp
+++ llvm/tools/dsymutil/dsymutil.cpp
@@ -37,6 +37,7 @@
 #include "llvm/Support/FileCollector.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/ThreadPool.h"
@@ -546,7 +547,7 @@
   return OutputLocation(std::string(Path.str()), ResourceDir);
 }
 
-int dsymutil_main(int argc, char **argv) {
+int dsymutil_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(argc, argv);
 
   // Parse arguments.
Index: llvm/tools/llvm-ar/llvm-ar.cpp
===================================================================
--- llvm/tools/llvm-ar/llvm-ar.cpp
+++ llvm/tools/llvm-ar/llvm-ar.cpp
@@ -36,6 +36,7 @@
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/LineIterator.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
@@ -1444,7 +1445,7 @@
   return 0;
 }
 
-int llvm_ar_main(int argc, char **argv) {
+int llvm_ar_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(argc, argv);
   ToolName = argv[0];
 
Index: llvm/tools/llvm-cxxfilt/llvm-cxxfilt.cpp
===================================================================
--- llvm/tools/llvm-cxxfilt/llvm-cxxfilt.cpp
+++ llvm/tools/llvm-cxxfilt/llvm-cxxfilt.cpp
@@ -15,6 +15,7 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/WithColor.h"
 #include "llvm/Support/raw_ostream.h"
 #include <cstdlib>
@@ -140,7 +141,8 @@
   OS.flush();
 }
 
-int llvm_cxxfilt_main(int argc, char **argv) {
+int llvm_cxxfilt_main(int argc, char **argv,
+                      const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(argc, argv);
   BumpPtrAllocator A;
   StringSaver Saver(A);
Index: llvm/tools/llvm-driver/llvm-driver.cpp
===================================================================
--- llvm/tools/llvm-driver/llvm-driver.cpp
+++ llvm/tools/llvm-driver/llvm-driver.cpp
@@ -11,12 +11,14 @@
 #include "llvm/ADT/StringSwitch.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/WithColor.h"
 
 using namespace llvm;
 
-#define LLVM_DRIVER_TOOL(tool, entry) int entry##_main(int argc, char **argv);
+#define LLVM_DRIVER_TOOL(tool, entry)                                          \
+  int entry##_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &);
 #include "LLVMDriverTools.def"
 
 constexpr char subcommands[] =
@@ -62,7 +64,7 @@
 
 #define LLVM_DRIVER_TOOL(tool, entry)                                          \
   if (Is(tool))                                                                \
-    return entry##_main(Argc, Argv);
+    return entry##_main(Argc, Argv, {});
 #include "LLVMDriverTools.def"
 
   if (Is("llvm"))
Index: llvm/tools/llvm-ifs/llvm-ifs.cpp
===================================================================
--- llvm/tools/llvm-ifs/llvm-ifs.cpp
+++ llvm/tools/llvm-ifs/llvm-ifs.cpp
@@ -23,6 +23,7 @@
 #include "llvm/Support/Errc.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileOutputBuffer.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/VersionTuple.h"
@@ -376,7 +377,7 @@
   return Config;
 }
 
-int llvm_ifs_main(int argc, char **argv) {
+int llvm_ifs_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &) {
   DriverConfig Config = parseArgs(argc, argv);
 
   if (Config.InputFilePaths.empty())
Index: llvm/tools/llvm-lipo/llvm-lipo.cpp
===================================================================
--- llvm/tools/llvm-lipo/llvm-lipo.cpp
+++ llvm/tools/llvm-lipo/llvm-lipo.cpp
@@ -28,6 +28,7 @@
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileOutputBuffer.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/WithColor.h"
 #include "llvm/TextAPI/Architecture.h"
@@ -719,7 +720,7 @@
   exit(EXIT_SUCCESS);
 }
 
-int llvm_lipo_main(int argc, char **argv) {
+int llvm_lipo_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(argc, argv);
   llvm::InitializeAllTargetInfos();
   llvm::InitializeAllTargetMCs();
Index: llvm/tools/llvm-mt/llvm-mt.cpp
===================================================================
--- llvm/tools/llvm-mt/llvm-mt.cpp
+++ llvm/tools/llvm-mt/llvm-mt.cpp
@@ -17,6 +17,7 @@
 #include "llvm/Support/Error.h"
 #include "llvm/Support/FileOutputBuffer.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/PrettyStackTrace.h"
@@ -79,7 +80,7 @@
     });
 }
 
-int llvm_mt_main(int Argc, char **Argv) {
+int llvm_mt_main(int Argc, char **Argv, const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(Argc, Argv);
 
   CvtResOptTable T;
Index: llvm/tools/llvm-nm/llvm-nm.cpp
===================================================================
--- llvm/tools/llvm-nm/llvm-nm.cpp
+++ llvm/tools/llvm-nm/llvm-nm.cpp
@@ -42,6 +42,7 @@
 #include "llvm/Support/Format.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Program.h"
 #include "llvm/Support/Signals.h"
@@ -2297,7 +2298,7 @@
   printExportSymbolList(SymbolList);
 }
 
-int llvm_nm_main(int argc, char **argv) {
+int llvm_nm_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(argc, argv);
   BumpPtrAllocator A;
   StringSaver Saver(A);
Index: llvm/tools/llvm-objcopy/llvm-objcopy.cpp
===================================================================
--- llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -44,6 +44,7 @@
 #include "llvm/Support/FileUtilities.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/Memory.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/Process.h"
@@ -223,7 +224,8 @@
   return Error::success();
 }
 
-int llvm_objcopy_main(int argc, char **argv) {
+int llvm_objcopy_main(int argc, char **argv,
+                      const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(argc, argv);
   ToolName = argv[0];
 
Index: llvm/tools/llvm-profdata/llvm-profdata.cpp
===================================================================
--- llvm/tools/llvm-profdata/llvm-profdata.cpp
+++ llvm/tools/llvm-profdata/llvm-profdata.cpp
@@ -31,6 +31,7 @@
 #include "llvm/Support/Format.h"
 #include "llvm/Support/FormattedStream.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/MD5.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
@@ -2859,7 +2860,8 @@
   return showMemProfProfile(Filename, ProfiledBinary, SFormat, OS);
 }
 
-int llvm_profdata_main(int argc, char **argvNonConst) {
+int llvm_profdata_main(int argc, char **argvNonConst,
+                       const llvm::LLVMDriverExtraArgs &) {
   const char **argv = const_cast<const char **>(argvNonConst);
   InitLLVM X(argc, argv);
 
Index: llvm/tools/llvm-rc/llvm-rc.cpp
===================================================================
--- llvm/tools/llvm-rc/llvm-rc.cpp
+++ llvm/tools/llvm-rc/llvm-rc.cpp
@@ -27,6 +27,7 @@
 #include "llvm/Support/FileUtilities.h"
 #include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/PrettyStackTrace.h"
@@ -724,7 +725,7 @@
 
 } // anonymous namespace
 
-int llvm_rc_main(int Argc, char **Argv) {
+int llvm_rc_main(int Argc, char **Argv, const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(Argc, Argv);
   ExitOnErr.setBanner("llvm-rc: ");
 
Index: llvm/tools/llvm-readobj/llvm-readobj.cpp
===================================================================
--- llvm/tools/llvm-readobj/llvm-readobj.cpp
+++ llvm/tools/llvm-readobj/llvm-readobj.cpp
@@ -44,6 +44,7 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/FormatVariadic.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/ScopedPrinter.h"
 #include "llvm/Support/WithColor.h"
@@ -620,7 +621,8 @@
   return std::make_unique<ScopedPrinter>(fouts());
 }
 
-int llvm_readobj_main(int argc, char **argv) {
+int llvm_readobj_main(int argc, char **argv,
+                      const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(argc, argv);
   BumpPtrAllocator A;
   StringSaver Saver(A);
Index: llvm/tools/llvm-size/llvm-size.cpp
===================================================================
--- llvm/tools/llvm-size/llvm-size.cpp
+++ llvm/tools/llvm-size/llvm-size.cpp
@@ -26,6 +26,7 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/LLVMDriver.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/WithColor.h"
 #include "llvm/Support/raw_ostream.h"
@@ -866,7 +867,7 @@
          << "(TOTALS)\n";
 }
 
-int llvm_size_main(int argc, char **argv) {
+int llvm_size_main(int argc, char **argv, const llvm::LLVMDriverExtraArgs &) {
   InitLLVM X(argc, argv);
   BumpPtrAllocator A;
   StringSaver Saver(A);