diff --git a/lld/MachO/Driver.h b/lld/MachO/Driver.h
--- a/lld/MachO/Driver.h
+++ b/lld/MachO/Driver.h
@@ -19,6 +19,7 @@
 public:
   MachOOptTable();
   llvm::opt::InputArgList parse(ArrayRef<const char *> argv);
+  void printHelp(const char *argv0);
 };
 
 // Create enum with OPT_xxx values for each option in Options.td
diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -33,6 +33,8 @@
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
 
+#include <unordered_map>
+
 using namespace llvm;
 using namespace llvm::MachO;
 using namespace llvm::sys;
@@ -73,6 +75,12 @@
   return args;
 }
 
+void MachOOptTable::printHelp(const char *argv0) {
+  PrintHelp(lld::outs(), (std::string(argv0) + " [options] file...").c_str(),
+            "LLVM Linker", false);
+  lld::outs() << "\n";
+}
+
 // This is for -lfoo. We'll look for libfoo.dylib from search paths.
 static Optional<std::string> findDylib(StringRef name) {
   for (StringRef dir : config->searchPaths) {
@@ -146,7 +154,7 @@
 // entry (the one nearest to the front of the list.)
 //
 // The file can also have line comments that start with '#'.
-void parseOrderFile(StringRef path) {
+static void parseOrderFile(StringRef path) {
   Optional<MemoryBufferRef> buffer = readFile(path);
   if (!buffer) {
     error("Could not read order file at " + path);
@@ -236,15 +244,114 @@
   return false;
 }
 
-static void handlePlatformVersion(opt::ArgList::iterator &it,
-                                  const opt::ArgList::iterator &end) {
-  // -platform_version takes 3 args, which LLVM's option library doesn't
-  // support directly.  So this explicitly handles that.
-  // FIXME: stash skipped args for later use.
-  for (int i = 0; i < 3; ++i) {
-    ++it;
-    if (it == end || (*it)->getOption().getID() != OPT_INPUT)
-      fatal("usage: -platform_version platform min_version sdk_version");
+template <typename UI, int capacity, int width>
+static bool parsePackedVersion(StringRef str, UI &result) {
+  if (str.empty())
+    return true;
+
+  result = 0;
+  SmallVector<StringRef, capacity> parts;
+  llvm::SplitString(str, parts, ".");
+  auto count = parts.size();
+
+  // The first version-number component uses all of the highest-order
+  // bits remaining after bits have been allocated for the lower-order
+  // version components.
+  unsigned long long maxNum =
+      (1 << (std::numeric_limits<UI>::digits - ((count - 1) * width)));
+  for (StringRef str : parts) {
+    unsigned long long num;
+    if (llvm::getAsUnsignedInteger(str, 10, num))
+      return true;
+    if (num >= maxNum)
+      return true;
+    maxNum = (1 << width); // max for the lower-order components
+    result |= num;
+    result <<= width;
+  }
+  result <<= (width * (capacity - count));
+
+  return false;
+}
+
+static bool parsePackedVersion32(StringRef str, uint32_t &result) {
+  return parsePackedVersion<uint32_t, 3, 8>(str, result);
+}
+
+static bool parsePackedVersion64(StringRef str, uint64_t &result) {
+  return parsePackedVersion<uint64_t, 5, 10>(str, result);
+}
+
+static void usageError(const opt::Arg *arg) {
+  const auto &opt = arg->getOption();
+  error("usage: " + opt.getPrefixedName() + " " + opt.getMetaVar());
+}
+
+static void parseCurrentVersion(const opt::Arg *arg) {
+  const char *sourceVersionStr = arg->getValue(0);
+  uint64_t sourceVersion;
+  if (parsePackedVersion64(sourceVersionStr, sourceVersion))
+    usageError(arg);
+  // FIXME: add semantics
+}
+
+static void parsePlatformVersion(const opt::Arg *arg) {
+  static const std::unordered_map<std::string, int> platforms = {
+      {"macos", 1},       {"ios", 2},          {"tvos", 3},    {"watchos", 4},
+      {"bridgeos", 5},    {"mac-catalyst", 6}, {"ios-sim", 7}, {"tvos-sim", 8},
+      {"watchos-sim", 9}, {"driverkit", 10},
+  };
+
+  const char *platformStr = arg->getValue(0);
+  const char *minVersionStr = arg->getValue(1);
+  const char *sdkVersionStr = arg->getValue(2);
+  unsigned long long platform;
+  uint32_t minVersion;
+  uint32_t sdkVersion;
+
+  if (!llvm::getAsUnsignedInteger(platformStr, 10, platform)) {
+    const auto &p = platforms.find(platformStr);
+    platform = (p == platforms.end() ? 0 : p->second);
+  }
+  if (parsePackedVersion32(minVersionStr, minVersion) ||
+      parsePackedVersion32(sdkVersionStr, sdkVersion) || platform < 1 ||
+      platform > 10) {
+    usageError(arg);
+  }
+  // FIXME: add semantics
+}
+
+static void warnIfDeprecatedOption(const opt::Option &opt) {
+  if (!opt.getGroup().isValid())
+    return;
+  if (opt.getGroup().getID() == OPT_grp_deprecated) {
+    warn("Option `" + opt.getPrefixedName() + "' is deprecated in ld64:");
+    warn(opt.getHelpText());
+  }
+}
+
+static void warnIfUnimplementedOption(const opt::Option &opt) {
+  if (!opt.getGroup().isValid())
+    return;
+  switch (opt.getGroup().getID()) {
+  case OPT_grp_deprecated:
+    // warn about deprecated options elsewhere
+    break;
+  case OPT_grp_undocumented:
+    warn("Option `" + opt.getPrefixedName() +
+         "' is undocumented for ld64. Should ldd implement it?");
+    break;
+  case OPT_grp_obsolete:
+    warn("Option `" + opt.getPrefixedName() +
+         "' is obsolete in ld64. Please modernize your usage");
+    break;
+  case OPT_grp_ignored:
+    warn("Option `" + opt.getPrefixedName() + "' is ignored in ld64");
+    break;
+  default:
+    warn("Option `" + opt.getPrefixedName() +
+         "' is not yet implemented. Stay tuned...");
+    break;
   }
 }
 
@@ -259,6 +366,11 @@
   MachOOptTable parser;
   opt::InputArgList args = parser.parse(argsArr.slice(1));
 
+  if (args.hasArg(OPT_help)) {
+    parser.printHelp(argsArr[0]);
+    return 0;
+  }
+
   config = make<Configuration>();
   symtab = make<SymbolTable>();
   target = createTargetInfo(args);
@@ -279,10 +391,17 @@
     return !errorCount();
   }
 
-  for (opt::ArgList::iterator it = args.begin(), end = args.end(); it != end;
-       ++it) {
-    const opt::Arg *arg = *it;
-    switch (arg->getOption().getID()) {
+  for (auto &arg : args) {
+    const auto &opt = arg->getOption();
+    warnIfDeprecatedOption(opt);
+    switch (opt.getID()) {
+    case OPT_o:
+    case OPT_dylib:
+      // handled elsewhere ...
+      break;
+    default:
+      warnIfUnimplementedOption(opt);
+      break;
     case OPT_INPUT:
       addFile(arg->getValue());
       break;
@@ -290,10 +409,12 @@
       if (Optional<std::string> path = findDylib(arg->getValue()))
         addFile(*path);
       break;
-    case OPT_platform_version: {
-      handlePlatformVersion(it, end); // Can advance "it".
+    case OPT_current_version:
+      parseCurrentVersion(arg);
+      break;
+    case OPT_platform_version:
+      parsePlatformVersion(arg);
       break;
-    }
     }
   }
 
diff --git a/lld/MachO/Options.td b/lld/MachO/Options.td
--- a/lld/MachO/Options.td
+++ b/lld/MachO/Options.td
@@ -1,42 +1,1001 @@
 include "llvm/Option/OptParser.td"
 
-def L: JoinedOrSeparate<["-"], "L">, MetaVarName<"<dir>">,
-  HelpText<"Add directory to library search path">;
+def help : Flag<["-", "--"], "help">;
 
-def Z: Flag<["-"], "Z">,
-  HelpText<"Do not add standard directories to library search path">;
+def grp_kind : OptionGroup<"kind">, HelpText<"OUTPUT KIND">;
 
-def arch: Separate<["-"], "arch">, MetaVarName<"<arch-name>">,
-  HelpText<"Architecture to link">;
+def execute : Flag<["-"], "execute">,
+     HelpText<"Produce a main executable (default)">,
+     Group<grp_kind>;
+def dylib : Flag<["-"], "dylib">,
+     HelpText<"Produce a shared library">,
+     Group<grp_kind>;
+def bundle : Flag<["-"], "bundle">,
+     HelpText<"Produce a bundle">,
+     Group<grp_kind>;
+def r : Flag<["-"], "r">,
+     HelpText<"Merge multiple object files into one, retaining relocations">,
+     Group<grp_kind>;
+def dylinker : Flag<["-"], "dylinker">,
+     HelpText<"Produce a dylinker only used when building dyld">,
+     Group<grp_kind>;
+def dynamic : Flag<["-"], "dynamic">,
+     HelpText<"Link dynamically (default)">,
+     Group<grp_kind>;
+def static : Flag<["-"], "static">,
+     HelpText<"Link statically">,
+     Group<grp_kind>;
+def preload : Flag<["-"], "preload">,
+     HelpText<"Produce an unsegmented binary for embedded systems">,
+     Group<grp_kind>;
+def arch : Separate<["-"], "arch">,
+     MetaVarName<"<arch_name>">,
+     HelpText<"The architecture (e.g. ppc, ppc64, i386, x86_64)">,
+     Group<grp_kind>;
+def o : Separate<["-"], "o">,
+     MetaVarName<"<path>">,
+     HelpText<"The name of the output file (default: `a.out')">,
+     Group<grp_kind>;
 
-def dylib: Flag<["-"], "dylib">, HelpText<"Emit a shared library">;
+def grp_libs : OptionGroup<"libs">, HelpText<"LIBRARIES">;
 
-def e: Separate<["-"], "e">, HelpText<"Name of entry point symbol">;
+def l : Joined<["-"], "l">,
+     MetaVarName<"<name>">,
+     HelpText<"Search for lib<name>.dylib or lib<name>.a on the library search path">,
+     Group<grp_libs>;
+def weak_l : Joined<["-"], "weak-l">,
+     MetaVarName<"<name>">,
+     HelpText<"Like -l<name>, but mark library and its references as weak imports">,
+     Group<grp_libs>;
+def weak_library : Separate<["-"], "weak_library">,
+     MetaVarName<"<path>">,
+     HelpText<"Like bare <path>, but mark library and its references as weak imports">,
+     Group<grp_libs>;
+def reexport_l : Joined<["-"], "reexport-l">,
+     MetaVarName<"<name>">,
+     HelpText<"Like -l<name>, but export all symbols of <name> from newly created library">,
+     Group<grp_libs>;
+def reexport_library : Separate<["-"], "reexport_library">,
+     MetaVarName<"<path>">,
+     HelpText<"Like bare <path>, but export all symbols of <path> from newly created library">,
+     Group<grp_libs>;
+def upward_l : Joined<["-"], "upward-l">,
+     MetaVarName<"<name>">,
+     HelpText<"Like -l<name>, but specify dylib as an upward dependency">,
+     Group<grp_libs>;
+def upward_library : Separate<["-"], "upward_library">,
+     MetaVarName<"<path>">,
+     HelpText<"Like bare <path>, but specify dylib as an upward dependency">,
+     Group<grp_libs>;
+def L : JoinedOrSeparate<["-"], "L">,
+     MetaVarName<"<dir>">,
+     HelpText<"Add dir to the library search path">,
+     Group<grp_libs>;
+def Z : Flag<["-"], "Z">,
+     HelpText<"Remove standard directories from the library and framework search paths">,
+     Group<grp_libs>;
+def syslibroot : Separate<["-"], "syslibroot">,
+     MetaVarName<"<rootdir>">,
+     HelpText<"Prepend <rootdir> to all library and framework search paths">,
+     Group<grp_libs>;
+def search_paths_first : Flag<["-"], "search_paths_first">,
+     HelpText<"Search for lib<name>.dylib and lib<name>.a at each step in traversing search path (default for Xcode 4 and later)">,
+     Group<grp_libs>;
+def search_dylibs_first : Flag<["-"], "search_dylibs_first">,
+     HelpText<"Search for lib<name>.dylib on first pass, then for lib<name>.a on second pass through search path (default for Xcode 3 and earlier)">,
+     Group<grp_libs>;
+def framework : Separate<["-"], "framework">,
+     MetaVarName<"<name>">,
+     HelpText<"Search for <name>.framework/<name> on the framework search path">,
+     Group<grp_libs>;
+def weak_framework : Separate<["-"], "weak_framework">,
+     MetaVarName<"<name>">,
+     HelpText<"Like -framework <name>, but mark framework and its references as weak imports">,
+     Group<grp_libs>;
+def reexport_framework : Separate<["-"], "reexport_framework">,
+     MetaVarName<"<name>">,
+     HelpText<"Like -framework <name>, but export all symbols of <name> from the newly created library">,
+     Group<grp_libs>;
+def upward_framework : Separate<["-"], "upward_framework">,
+     MetaVarName<"<name>">,
+     HelpText<"Like -framework <name>, but specify the framework as an upward dependency">,
+     Group<grp_libs>;
+def F : JoinedOrSeparate<["-"], "F">,
+     MetaVarName<"<dir>">,
+     HelpText<"Add dir to the framework search path">,
+     Group<grp_libs>;
+def all_load : Flag<["-"], "all_load">,
+     HelpText<"Load all members of all static archive libraries">,
+     Group<grp_libs>;
+def ObjC : Flag<["-"], "ObjC">,
+     HelpText<"Load all members of static archives that are an Objective-C class or category.">,
+     Group<grp_libs>;
+def force_load : Separate<["-"], "force_load">,
+     MetaVarName<"<path>">,
+     HelpText<"Load all members static archive library at <path>">,
+     Group<grp_libs>;
 
-def install_name: Separate<["-"], "install_name">,
-  MetaVarName<"<install-name>">,
-  HelpText<"Set the install path of the dynamic library.">;
+def grp_content : OptionGroup<"content">, HelpText<"ADDITIONAL CONTENT">;
 
-def l: Joined<["-"], "l">, MetaVarName<"<libname>">,
-  HelpText<"Base name of library searched for in -L directories">;
+def sectcreate : MultiArg<["-"], "sectcreate", 3>,
+     MetaVarName<"<segment> <section> <file>">,
+     HelpText<"Create <section> in <segment> from the contents of <file>">,
+     Group<grp_content>;
+def segcreate : MultiArg<["-"], "segcreate", 3>,
+     MetaVarName<"<segment> <section> <file>">,
+     Alias<sectcreate>,
+     HelpText<"Alias for -sectcreate">;
+def filelist : Separate<["-"], "filelist">,
+     MetaVarName<"<file>">,
+     HelpText<"Read names of files to link from <file>">,
+     Group<grp_content>;
+def dtrace : Separate<["-"], "dtrace">,
+     MetaVarName<"<script>">,
+     HelpText<"Enable DTrace static probes according to declarations in <script>">,
+     Group<grp_content>;
 
-def o: Separate<["-"], "o">, MetaVarName<"<path>">,
-  HelpText<"Path to file to write output">;
+def grp_opts : OptionGroup<"opts">, HelpText<"OPTIMIZATIONS">;
 
-def order_file: Separate<["-"], "order_file">,
-  HelpText<"Lay out symbols within each section in the order specified by the "
-           "order file">;
+def dead_strip : Flag<["-"], "dead_strip">,
+     HelpText<"Remove unreachable functions and data">,
+     Group<grp_opts>;
+def order_file : Separate<["-"], "order_file">,
+     MetaVarName<"<file>">,
+     HelpText<"Layout functions and data according to specification in <file>">,
+     Group<grp_opts>;
+def sectorder : MultiArg<["-"], "sectorder", 3>,
+     MetaVarName<"<segname> <sectname> <orderfile>">,
+     HelpText<"Replaced by more general -order_file option">,
+     Group<grp_opts>;
+def no_order_inits : Flag<["-"], "no_order_inits">,
+     HelpText<"Disable default reordering of initializer and terminator functions">,
+     Group<grp_opts>;
+def no_order_data : Flag<["-"], "no_order_data">,
+     HelpText<"Disable default reordering of global data accessed at launch time">,
+     Group<grp_opts>;
+def platform_version : MultiArg<["-"], "platform_version", 3>,
+     MetaVarName<"<platform> <min_version> <sdk_version>">,
+     HelpText<"Platform (e.g., macos, ios, tvos, watchos, bridgeos, mac-catalyst, ios-sim, tvos-sim, watchos-sim, driverkit) and version numbers">,
+     Group<grp_opts>;
+def macos_version_min : Separate<["-"], "macos_version_min">,
+     MetaVarName<"<version>">,
+     HelpText<"Oldest macOS version for which linked output is useable">,
+     Group<grp_opts>;
+def macosx_version_min : Separate<["-"], "macosx_version_min">,
+     MetaVarName<"<version>">,
+     Alias<macos_version_min>,
+     HelpText<"Alias for -macos_version_min">;
+def ios_version_min : Separate<["-"], "ios_version_min">,
+     MetaVarName<"<version>">,
+     HelpText<"Oldest iOS version for which linked output is useable">,
+     Group<grp_opts>;
+def iphoneos_version_min : Separate<["-"], "iphoneos_version_min">,
+     MetaVarName<"<version>">,
+     Alias<ios_version_min>,
+     HelpText<"Alias for -ios_version_min">;
+def image_base : Separate<["-"], "image_base">,
+     MetaVarName<"<address>">,
+     HelpText<"Preferred hex load address for a dylib or bundle.">,
+     Group<grp_opts>;
+def seg1addr : Separate<["-"], "seg1addr">,
+     MetaVarName<"<address>">,
+     Alias<image_base>,
+     HelpText<"Alias for -image_base">;
+def no_implicit_dylibs : Flag<["-"], "no_implicit_dylibs">,
+     HelpText<"Do not optimize public dylib transitive symbol references">,
+     Group<grp_opts>;
+def exported_symbols_order : Separate<["-"], "exported_symbols_order">,
+     MetaVarName<"<file>">,
+     HelpText<"Specify frequently-used symbols in <file> to optimize symbol exports">,
+     Group<grp_opts>;
+def no_zero_fill_sections : Flag<["-"], "no_zero_fill_sections">,
+     HelpText<"Explicitly store zeroed data in the final image">,
+     Group<grp_opts>;
+def merge_zero_fill_sections : Flag<["-"], "merge_zero_fill_sections">,
+     HelpText<"Merge all zeroed data into the __zerofill section">,
+     Group<grp_opts>;
+def no_branch_islands : Flag<["-"], "no_branch_islands">,
+     HelpText<"Disable infra for branches beyond the maximum branch distance.">,
+     Group<grp_opts>;
 
-def sub_library: Separate<["-"], "sub_library">, MetaVarName<"<libname>">,
-  HelpText<"Re-export the specified dylib">;
+def grp_dylib : OptionGroup<"dylib">, HelpText<"DYNAMIC LIBRARIES (DYLIB)">;
 
-def v: Flag<["-"], "v">, HelpText<"Display the version number and exit">;
+def install_name : Separate<["-"], "install_name">,
+     MetaVarName<"<name>">,
+     HelpText<"Set an internal install path in a dylib">,
+     Group<grp_dylib>;
+def dylib_install_name : Separate<["-"], "dylib_install_name">,
+     MetaVarName<"<name>">,
+     Alias<install_name>,
+     HelpText<"Alias for -install_name">;
+def dylinker_install_name : Separate<["-"], "dylinker_install_name">,
+     MetaVarName<"<name>">,
+     Alias<install_name>,
+     HelpText<"Alias for -install_name">;
+def mark_dead_strippable_dylib : Flag<["-"], "mark_dead_strippable_dylib">,
+     HelpText<"Clients can discard this dylib if it is unreferenced">,
+     Group<grp_dylib>;
+def compatibility_version : Separate<["-"], "compatibility_version">,
+     MetaVarName<"<number>">,
+     HelpText<"Compatibility version number of this library">,
+     Group<grp_dylib>;
+def dylib_compatibility_version : Separate<["-"], "dylib_compatibility_version">,
+     MetaVarName<"<number>">,
+     Alias<compatibility_version>,
+     HelpText<"Alias for -compatibility_version">;
+def current_version : Separate<["-"], "current_version">,
+     MetaVarName<"<number>">,
+     HelpText<"Current version number of this library">,
+     Group<grp_dylib>;
+def dylib_current_version : Separate<["-"], "dylib_current_version">,
+     MetaVarName<"<number>">,
+     Alias<current_version>,
+     HelpText<"Alias for -current_version">;
 
-// Ignored options
-def: Flag<["-"], "demangle">;
-def: Flag<["-"], "dynamic">;
-def: Flag<["-"], "no_deduplicate">;
-def platform_version: Flag<["-"], "platform_version">;
-def: Separate<["-"], "lto_library">;
-def: Separate<["-"], "macosx_version_min">;
-def: Separate<["-"], "syslibroot">;
+def grp_main : OptionGroup<"main">, HelpText<"MAIN EXECUTABLE">;
+
+def pie : Flag<["-"], "pie">,
+     HelpText<"Build a position independent executable (default for macOS 10.7 and later)">,
+     Group<grp_main>;
+def no_pie : Flag<["-"], "no_pie">,
+     HelpText<"Do not build a position independent executable (default for macOS 10.6 and earlier)">,
+     Group<grp_main>;
+def pagezero_size : Separate<["-"], "pagezero_size">,
+     MetaVarName<"<size>">,
+     HelpText<"Size of unreadable segment at address zero is hex <size> (default is 4KB on 32-bit and 4GB on 64-bit)">,
+     Group<grp_main>;
+def stack_size : Separate<["-"], "stack_size">,
+     MetaVarName<"<size>">,
+     HelpText<"Maximum hex stack size for the main thread in a program. (default is 8MB)">,
+     Group<grp_main>;
+def allow_stack_execute : Flag<["-"], "allow_stack_execute">,
+     HelpText<"Mark stack segment as executable">,
+     Group<grp_main>;
+def export_dynamic : Flag<["-"], "export_dynamic">,
+     HelpText<"Preserve all global symbols during LTO">,
+     Group<grp_main>;
+
+def grp_bundle : OptionGroup<"bundle">, HelpText<"CREATING A BUNDLE">;
+
+def bundle_loader : Separate<["-"], "bundle_loader">,
+     MetaVarName<"<executable>">,
+     HelpText<"Resolve undefined symbols from <executable>">,
+     Group<grp_bundle>;
+
+def grp_object : OptionGroup<"object">, HelpText<"CREATING AN OBJECT FILE">;
+
+def keep_private_externs : Flag<["-"], "keep_private_externs">,
+     HelpText<"Do not convert private external symbols to static symbols">,
+     Group<grp_object>;
+def d : Flag<["-"], "d">,
+     HelpText<"Force tentative into real definitions for common symbols">,
+     Group<grp_object>;
+
+def grp_resolve : OptionGroup<"resolve">, HelpText<"SYMBOL RESOLUTION">;
+
+def exported_symbols_list : Separate<["-"], "exported_symbols_list">,
+     MetaVarName<"<file>">,
+     HelpText<"Symbols specified in <file> remain global, while others become private externs">,
+     Group<grp_resolve>;
+def exported_symbol : Separate<["-"], "exported_symbol">,
+     MetaVarName<"<symbol>">,
+     HelpText<"<symbol> remains global, while others become private externs">,
+     Group<grp_resolve>;
+def unexported_symbols_list : Separate<["-"], "unexported_symbols_list">,
+     MetaVarName<"<file>">,
+     HelpText<"Global symbols specified in <file> become private externs">,
+     Group<grp_resolve>;
+def unexported_symbol : Separate<["-"], "unexported_symbol">,
+     MetaVarName<"<symbol>">,
+     HelpText<"Global <symbol> becomes private extern">,
+     Group<grp_resolve>;
+def reexported_symbols_list : Separate<["-"], "reexported_symbols_list">,
+     MetaVarName<"<file>">,
+     HelpText<"Symbols from dependent dylibs specified in <file> are reexported by this dylib">,
+     Group<grp_resolve>;
+def alias : MultiArg<["-"], "alias", 2>,
+     MetaVarName<"<symbol_name> <alternate_name>">,
+     HelpText<"Create a symbol alias with default global visibility">,
+     Group<grp_resolve>;
+def alias_list : Separate<["-"], "alias_list">,
+     MetaVarName<"<file>">,
+     HelpText<"Create symbol aliases specified in <file>">,
+     Group<grp_resolve>;
+def flat_namespace : Flag<["-"], "flat_namespace">,
+     HelpText<"Resolve symbols from all dylibs, both direct & transitive. Do not record source libraries: dyld must re-search at runtime and use the first definition found">,
+     Group<grp_resolve>;
+def u : Separate<["-"], "u">,
+     MetaVarName<"<symbol>">,
+     HelpText<"Require that <symbol> be defined for the link to succeed">,
+     Group<grp_resolve>;
+def U : Separate<["-"], "U">,
+     MetaVarName<"<symbol>">,
+     HelpText<"Allow <symbol> to have no definition">,
+     Group<grp_resolve>;
+def undefined : Separate<["-"], "undefined">,
+     MetaVarName<"<treatment>">,
+     HelpText<"Handle undefined symbols according to <treatment>: error, warning, suppress, or dynamic_lookup (default is error)">,
+     Group<grp_resolve>;
+def rpath : Separate<["-"], "rpath">,
+     MetaVarName<"<path>">,
+     HelpText<"Add <path> to dyld search list for dylibs with load path prefix `@rpath/'">,
+     Group<grp_resolve>;
+def commons : Separate<["-"], "commons">,
+     MetaVarName<"<treatment>">,
+     HelpText<"Resolve tentative definitions in dylibs according to <treatment>: ignore_dylibs, use_dylibs, error (default is ignore_dylibs)">,
+     Group<grp_resolve>;
+
+def grp_introspect : OptionGroup<"introspect">, HelpText<"INTROSPECTING THE LINKER">;
+
+def why_load : Flag<["-"], "why_load">,
+     HelpText<"Log the symbol that compels loading of each object file from a static library">,
+     Group<grp_introspect>;
+def whyload : Flag<["-"], "whyload">,
+     Alias<why_load>,
+     HelpText<"Alias for -why_load">;
+def why_live : Separate<["-"], "why_live">,
+     MetaVarName<"<symbol>">,
+     HelpText<"Log a chain of references to <symbol>, for use with -dead_strip">,
+     Group<grp_introspect>;
+def print_statistics : Flag<["-"], "print_statistics">,
+     HelpText<"Log the linker's memory and CPU usage">,
+     Group<grp_introspect>;
+def t : Flag<["-"], "t">,
+     HelpText<"Log every file the linker loads: object, archive, and dylib">,
+     Group<grp_introspect>;
+def whatsloaded : Flag<["-"], "whatsloaded">,
+     HelpText<"Logs only the object files the linker loads">,
+     Group<grp_introspect>;
+def order_file_statistics : Flag<["-"], "order_file_statistics">,
+     HelpText<"Logs information about -order_file">,
+     Group<grp_introspect>;
+def map : Separate<["-"], "map">,
+     MetaVarName<"<path>">,
+     HelpText<"Writes all symbols and their addresses to <path>">,
+     Group<grp_introspect>;
+
+def grp_symtab : OptionGroup<"symtab">, HelpText<"SYMBOL TABLE OPTIMIZATIONS">;
+
+def S : Flag<["-"], "S">,
+     HelpText<"Strip debug information (STABS or DWARF) from the output">,
+     Group<grp_symtab>;
+def x : Flag<["-"], "x">,
+     HelpText<"Exclude non-global symbols from the output symbol table">,
+     Group<grp_symtab>;
+def non_global_symbols_strip_list : Separate<["-"], "non_global_symbols_strip_list">,
+     MetaVarName<"<path>">,
+     HelpText<"Specify in <path> the non-global symbols that should be removed from the output symbol table">,
+     Group<grp_symtab>;
+def non_global_symbols_no_strip_list : Separate<["-"], "non_global_symbols_no_strip_list">,
+     MetaVarName<"<path>">,
+     HelpText<"Specify in <path> the non-global symbols that should remain in the output symbol table">,
+     Group<grp_symtab>;
+def oso_prefix : Separate<["-"], "oso_prefix">,
+     MetaVarName<"<path>">,
+     HelpText<"Remove the prefix <path> from OSO symbols in the debug map">,
+     Group<grp_symtab>;
+
+def grp_bitcode : OptionGroup<"bitcode">, HelpText<"BITCODE BUILD FLOW">;
+
+def bitcode_bundle : Flag<["-"], "bitcode_bundle">,
+     HelpText<"Generate an embedded bitcode bundle in the __LLVM,__bundle section of the output">,
+     Group<grp_bitcode>;
+def bitcode_hide_symbols : Flag<["-"], "bitcode_hide_symbols">,
+     HelpText<"With -bitcode_bundle, hide all non-exported symbols from output bitcode bundle.">,
+     Group<grp_bitcode>;
+def bitcode_symbol_map : Separate<["-"], "bitcode_symbol_map">,
+     MetaVarName<"<path>">,
+     HelpText<"Write the bitcode symbol reverse mapping to file <path>, or if a directory, to <path>/UUID.bcsymbolmap">,
+     Group<grp_bitcode>;
+
+def grp_rare : OptionGroup<"rare">, HelpText<"RARELY USED">;
+
+def v : Flag<["-"], "v">,
+     HelpText<"Print the linker version">,
+     Group<grp_rare>;
+def version_details : Flag<["-"], "version_details">,
+     HelpText<"Print the linker version in JSON form">,
+     Group<grp_rare>;
+def no_weak_imports : Flag<["-"], "no_weak_imports">,
+     HelpText<"Fail if any symbols are weak imports, allowed to be NULL at runtime">,
+     Group<grp_rare>;
+def no_deduplicate : Flag<["-"], "no_deduplicate">,
+     HelpText<"Omit the deduplication pass">,
+     Group<grp_rare>;
+def verbose_deduplicate : Flag<["-"], "verbose_deduplicate">,
+     HelpText<"Print function names eliminated by deduplication and the total size of code savings">,
+     Group<grp_rare>;
+def no_inits : Flag<["-"], "no_inits">,
+     HelpText<"Fail if the output contains static initializers">,
+     Group<grp_rare>;
+def no_warn_inits : Flag<["-"], "no_warn_inits">,
+     HelpText<"Suppress warnings for static initializers in the output">,
+     Group<grp_rare>;
+def debug_variant : Flag<["-"], "debug_variant">,
+     HelpText<"Suppress warnings germane to binaries shipping to customers">,
+     Group<grp_rare>;
+def unaligned_pointers : Separate<["-"], "unaligned_pointers">,
+     MetaVarName<"<treatment>">,
+     HelpText<"Handle unaligned pointers in __DATA segments according to <treatment>: warning, error, or suppress (default for arm64e is error, otherwise suppress)">,
+     Group<grp_rare>;
+def dirty_data_list : Separate<["-"], "dirty_data_list">,
+     MetaVarName<"<path>">,
+     HelpText<"Specify data symbols in <path> destined for the __DATA_DIRTY segment">,
+     Group<grp_rare>;
+def max_default_common_align : Separate<["-"], "max_default_common_align">,
+     MetaVarName<"<boundary>">,
+     HelpText<"Reduce maximum alignment for common symbols to a hex power-of-2 <boundary>">,
+     Group<grp_rare>;
+def move_to_rw_segment : MultiArg<["-"], "move_to_rw_segment", 2>,
+     MetaVarName<"<segment> <path>">,
+     HelpText<"Move data symbols listed in <path> to another <segment>">,
+     Group<grp_rare>;
+def move_to_ro_segment : MultiArg<["-"], "move_to_ro_segment", 2>,
+     MetaVarName<"<segment> <path>">,
+     HelpText<"Move code symbols listed in <path> to another <segment>">,
+     Group<grp_rare>;
+def rename_section : MultiArg<["-"], "rename_section", 4>,
+     MetaVarName<"<from_segment> <from_section> <to_segment> <to_section>">,
+     HelpText<"Rename <from_segment>/<from_section> as <to_segment>/<to_section>">,
+     Group<grp_rare>;
+def rename_segment : MultiArg<["-"], "rename_segment", 2>,
+     MetaVarName<"<from_segment> <to_segment>">,
+     HelpText<"Rename <from_segment> as <to_segment>">,
+     Group<grp_rare>;
+def trace_symbol_layout : Flag<["-"], "trace_symbol_layout">,
+     HelpText<"Show where and why symbols move, as specified by -move_to_ro_segment, -move_to_rw_segment, -rename_section, and -rename_segment">,
+     Group<grp_rare>;
+def section_order : MultiArg<["-"], "section_order", 2>,
+     MetaVarName<"<segment> <sections>">,
+     HelpText<"With -preload, specify layout sequence of colon-separated <sections> in <segment>">,
+     Group<grp_rare>;
+def segment_order : Separate<["-"], "segment_order">,
+     MetaVarName<"<colon_separated_segment_list>">,
+     HelpText<"With -preload, specify layout sequence of colon-separated <segments>">,
+     Group<grp_rare>;
+def allow_heap_execute : Flag<["-"], "allow_heap_execute">,
+     HelpText<"On i386, allow any page to execute code">,
+     Group<grp_rare>;
+def application_extension : Flag<["-"], "application_extension">,
+     HelpText<"Designate the linker output as safe for use in an application extension">,
+     Group<grp_rare>;
+def no_application_extension : Flag<["-"], "no_application_extension">,
+     HelpText<"Designate the linker output as unsafe for use in an application extension">,
+     Group<grp_rare>;
+def fatal_warnings : Flag<["-"], "fatal_warnings">,
+     HelpText<"Escalate warnings as errors">,
+     Group<grp_rare>;
+def no_eh_labels : Flag<["-"], "no_eh_labels">,
+     HelpText<"In -r mode, suppress .eh lables in the __eh_frame section">,
+     Group<grp_rare>;
+def warn_compact_unwind : Flag<["-"], "warn_compact_unwind">,
+     HelpText<"Warn for each FDE that cannot compact into the __unwind_info section and must remain in the __eh_frame section">,
+     Group<grp_rare>;
+def warn_weak_exports : Flag<["-"], "warn_weak_exports">,
+     HelpText<"Warn if the linked image contains weak external symbols">,
+     Group<grp_rare>;
+def no_weak_exports : Flag<["-"], "no_weak_exports">,
+     HelpText<"Fail if the linked image contains weak external symbols">,
+     Group<grp_rare>;
+def objc_gc_compaction : Flag<["-"], "objc_gc_compaction">,
+     HelpText<"Mark the Objective-C image as compatible with compacting garbage collection">,
+     Group<grp_rare>;
+def objc_gc : Flag<["-"], "objc_gc">,
+     HelpText<"Verify that all code was compiled with -fobjc-gc or -fobjc-gc-only">,
+     Group<grp_rare>;
+def objc_gc_only : Flag<["-"], "objc_gc_only">,
+     HelpText<"Verify that all code was compiled with -fobjc-gc-only">,
+     Group<grp_rare>;
+def dead_strip_dylibs : Flag<["-"], "dead_strip_dylibs">,
+     HelpText<"Remove dylibs that are unreachable by the entry point or exported symbols">,
+     Group<grp_rare>;
+def allow_sub_type_mismatches : Flag<["-"], "allow_sub_type_mismatches">,
+     HelpText<"Permit mixing objects compiled for different ARM CPU subtypes">,
+     Group<grp_rare>;
+def no_uuid : Flag<["-"], "no_uuid">,
+     HelpText<"Do not generate the LC_UUID load command">,
+     Group<grp_rare>;
+def root_safe : Flag<["-"], "root_safe">,
+     HelpText<"Set the MH_ROOT_SAFE bit in the mach-o header">,
+     Group<grp_rare>;
+def setuid_safe : Flag<["-"], "setuid_safe">,
+     HelpText<"Set the MH_SETUID_SAFE bit in the mach-o header">,
+     Group<grp_rare>;
+def interposable : Flag<["-"], "interposable">,
+     HelpText<"Indirects access to all to exported symbols in a dylib">,
+     Group<grp_rare>;
+def multi_module : Flag<["-"], "multi_module">,
+     Alias<interposable>,
+     HelpText<"Alias for -interposable">;
+def init : Separate<["-"], "init">,
+     MetaVarName<"<symbol>">,
+     HelpText<"Run <symbol> as the first initializer in a dylib">,
+     Group<grp_rare>;
+def sub_library : Separate<["-"], "sub_library">,
+     MetaVarName<"<name>">,
+     HelpText<"Re-export the dylib as <name>">,
+     Group<grp_rare>;
+def sub_umbrella : Separate<["-"], "sub_umbrella">,
+     MetaVarName<"<name>">,
+     HelpText<"Re-export the framework as <name>">,
+     Group<grp_rare>;
+def allowable_client : Separate<["-"], "allowable_client">,
+     MetaVarName<"<name>">,
+     HelpText<"Whitelists dylibs and frameworks by <name> that can link to this dylib">,
+     Group<grp_rare>;
+def client_name : Separate<["-"], "client_name">,
+     MetaVarName<"<name>">,
+     HelpText<"Specifies a <name> this client should match with the -allowable_client <name> in a dependent dylib">,
+     Group<grp_rare>;
+def umbrella : Separate<["-"], "umbrella">,
+     MetaVarName<"<<name>>">,
+     HelpText<"Re-export this dylib through the umbrella framework <name>a">,
+     Group<grp_rare>;
+def headerpad : Separate<["-"], "headerpad">,
+     MetaVarName<"<size>">,
+     HelpText<"Allocate hex <size> extra space for future expansion of the load commands via install_name_tool">,
+     Group<grp_rare>;
+def headerpad_max_install_names : Flag<["-"], "headerpad_max_install_names">,
+     HelpText<"Allocate extra space so all load-command paths can expand to MAXPATHLEN via install_name_tool">,
+     Group<grp_rare>;
+def bind_at_load : Flag<["-"], "bind_at_load">,
+     HelpText<"Tell dyld to bind all symbols at load time, rather than lazily">,
+     Group<grp_rare>;
+def force_flat_namespace : Flag<["-"], "force_flat_namespace">,
+     HelpText<"Tell dyld to use a flat namespace on this executable and all its dependent dylibs & bundles">,
+     Group<grp_rare>;
+def segalign : Separate<["-"], "segalign">,
+     MetaVarName<"<boundary>">,
+     HelpText<"Align all segments to hex power-of-2 <boundary>">,
+     Group<grp_rare>;
+def sectalign : MultiArg<["-"], "sectalign", 3>,
+     MetaVarName<"<segment> <section> <boundary>">,
+     HelpText<"Align <section> within <segment> to hex power-of-2 <boundary>">,
+     Group<grp_rare>;
+def stack_addr : Separate<["-"], "stack_addr">,
+     MetaVarName<"<address>">,
+     HelpText<"Initialize stack pointer to hex <address> rounded to a page boundary">,
+     Group<grp_rare>;
+def segprot : MultiArg<["-"], "segprot", 3>,
+     MetaVarName<"<segment> <max> <init>">,
+     HelpText<"Specifies the <max> and <init> virtual memory protection of <segment> as r/w/x/-seg_addr_table path Specify hex base addresses and dylib install names on successive lines in <path>. This option is obsolete">,
+     Group<grp_rare>;
+def segs_read_write_addr : Separate<["-"], "segs_read_write_addr">,
+     MetaVarName<"<address>">,
+     HelpText<"This option is obsolete">,
+     Group<grp_rare>;
+def segs_read_only_addr : Separate<["-"], "segs_read_only_addr">,
+     MetaVarName<"<address>">,
+     HelpText<"This option is obsolete">,
+     Group<grp_rare>;
+def segaddr : MultiArg<["-"], "segaddr", 2>,
+     MetaVarName<"<segment> <address>">,
+     HelpText<"Specify the starting hex <address> at a 4KiB page boundary for <segment>">,
+     Group<grp_rare>;
+def seg_page_size : MultiArg<["-"], "seg_page_size", 2>,
+     MetaVarName<"<segment> <size>">,
+     HelpText<"Specifies the page <size> for <segment>. Segment size will be a multiple of its page size">,
+     Group<grp_rare>;
+def dylib_file : Separate<["-"], "dylib_file">,
+     MetaVarName<"<install_path:current_path>">,
+     HelpText<"Specify <current_path> as different from where a dylib normally resides at <install_path>">,
+     Group<grp_rare>;
+def prebind : Flag<["-"], "prebind">,
+     HelpText<"This option is obsolete">,
+     Group<grp_rare>;
+def weak_reference_mismatches : Separate<["-"], "weak_reference_mismatches">,
+     MetaVarName<"<treatment>">,
+     HelpText<"Resolve symbol imports of conflicting weakness according to <treatment> as weak, non-weak, or error (default is non-weak)">,
+     Group<grp_rare>;
+def read_only_relocs : Separate<["-"], "read_only_relocs">,
+     MetaVarName<"<treatment>">,
+     HelpText<"Handle relocations that modify read-only pages according to <treatment> of warning, error, or suppress (i.e., allow)">,
+     Group<grp_rare>;
+def force_cpusubtype_ALL : Flag<["-"], "force_cpusubtype_ALL">,
+     HelpText<"Mark binary as runnable on any PowerPC, ignoring any PowerPC cpu requirements encoded in the object files">,
+     Group<grp_rare>;
+def no_arch_warnings : Flag<["-"], "no_arch_warnings">,
+     HelpText<"Suppresses warnings about inputs whose architecture does not match the -arch option">,
+     Group<grp_rare>;
+def arch_errors_fatal : Flag<["-"], "arch_errors_fatal">,
+     HelpText<"Escalate to errors any warnings about inputs whose architecture does not match the -arch option">,
+     Group<grp_rare>;
+def e : Separate<["-"], "e">,
+     MetaVarName<"<symbol>">,
+     HelpText<"Make <symbol> the entry point of an executable (default is \"start\" from crt1.o)">,
+     Group<grp_rare>;
+def w : Flag<["-"], "w">,
+     HelpText<"Suppress all warnings">,
+     Group<grp_rare>;
+def final_output : Separate<["-"], "final_output">,
+     MetaVarName<"<name>">,
+     HelpText<"Specify the dylib install name if -install_name is not used--used by compiler driver for multiple -arch arguments">,
+     Group<grp_rare>;
+def arch_multiple : Flag<["-"], "arch_multiple">,
+     HelpText<"Augment error and warning messages with the architecture name">,
+     Group<grp_rare>;
+def twolevel_namespace_hints : Flag<["-"], "twolevel_namespace_hints">,
+     HelpText<"This option is obsolete">,
+     Group<grp_rare>;
+def dot : Separate<["-"], "dot">,
+     MetaVarName<"<path>">,
+     HelpText<"Write a graph of symbol dependencies to <path> as a .dot file viewable with GraphViz">,
+     Group<grp_rare>;
+def keep_relocs : Flag<["-"], "keep_relocs">,
+     HelpText<"Retain section-based relocation records in the output, which are ignored at runtime by dyld">,
+     Group<grp_rare>;
+def warn_stabs : Flag<["-"], "warn_stabs">,
+     HelpText<"Warn when bad stab symbols inside a BINCL/EINCL prevent optimization">,
+     Group<grp_rare>;
+def warn_commons : Flag<["-"], "warn_commons">,
+     HelpText<"Warn when a tentative definition in an object file matches an external symbol in a dylib, which often means \"extern\" is missing from a variable declaration in a header file">,
+     Group<grp_rare>;
+def read_only_stubs : Flag<["-"], "read_only_stubs">,
+     HelpText<"On i386, make the __IMPORT segment of a final linked image read-only">,
+     Group<grp_rare>;
+def slow_stubs : Flag<["-"], "slow_stubs">,
+     HelpText<"This option is obsolete">,
+     Group<grp_rare>;
+def interposable_list : Separate<["-"], "interposable_list">,
+     MetaVarName<"<path>">,
+     HelpText<"Access global symbols listed in <path> indirectly">,
+     Group<grp_rare>;
+def no_function_starts : Flag<["-"], "no_function_starts">,
+     HelpText<"Do not creates a compressed table of function start addresses">,
+     Group<grp_rare>;
+def no_objc_category_merging : Flag<["-"], "no_objc_category_merging">,
+     HelpText<"Do not merge Objective-C categories into their classes">,
+     Group<grp_rare>;
+def object_path_lto : Separate<["-"], "object_path_lto">,
+     MetaVarName<"<path>">,
+     HelpText<"Retain any temporary mach-o file in <path> that would otherwise be deleted during LTO">,
+     Group<grp_rare>;
+def lto_library : Separate<["-"], "lto_library">,
+     MetaVarName<"<path>">,
+     HelpText<"Override the default ../lib/libLTO.dylib as <path>">,
+     Group<grp_rare>;
+def cache_path_lto : Separate<["-"], "cache_path_lto">,
+     MetaVarName<"<path>">,
+     HelpText<"Use <path> as a directory for the incremental LTO cache">,
+     Group<grp_rare>;
+def prune_interval_lto : Separate<["-"], "prune_interval_lto">,
+     MetaVarName<"<seconds>">,
+     HelpText<"Prune the incremental LTO cache after <seconds> (-1 disables pruning)">,
+     Group<grp_rare>;
+def prune_after_lto : Separate<["-"], "prune_after_lto">,
+     MetaVarName<"<seconds>">,
+     HelpText<"Remove LTO cache entries after <seconds>">,
+     Group<grp_rare>;
+def max_relative_cache_size_lto : Separate<["-"], "max_relative_cache_size_lto">,
+     MetaVarName<"<percent>">,
+     HelpText<"Limit the incremental LTO cache growth to <percent> of free disk, space">,
+     Group<grp_rare>;
+def page_align_data_atoms : Flag<["-"], "page_align_data_atoms">,
+     HelpText<"Distribute global variables on separate pages so page used/dirty status can guide creation of an order file to cluster commonly used/dirty globals">,
+     Group<grp_rare>;
+def not_for_dyld_shared_cache : Flag<["-"], "not_for_dyld_shared_cache">,
+     HelpText<"Prevent system dylibs from being placed into the dylib shared cache">,
+     Group<grp_rare>;
+
+def grp_deprecated : OptionGroup<"deprecated">, HelpText<"DEPRECATED">;
+
+def lazy_framework : Separate<["-"], "lazy_framework">,
+     MetaVarName<"<name>">,
+     HelpText<"This option is deprecated and is now an alias for -framework.">,
+     Group<grp_deprecated>;
+def lazy_library : Separate<["-"], "lazy_library">,
+     MetaVarName<"<path>">,
+     HelpText<"This option is deprecated and is now an alias for regular linking">,
+     Group<grp_deprecated>;
+def lazy_l : Joined<["-"], "lazy-l">,
+     MetaVarName<"<name>">,
+     HelpText<"This option is deprecated and is now an alias for -l<path>.">,
+     Group<grp_deprecated>;
+def single_module : Flag<["-"], "single_module">,
+     HelpText<"Unnecessary option: this is already the default">,
+     Group<grp_deprecated>;
+def no_dead_strip_inits_and_terms : Flag<["-"], "no_dead_strip_inits_and_terms">,
+     HelpText<"Unnecessary option: initialization and termination are roots of the dead strip graph, so never dead stripped">,
+     Group<grp_deprecated>;
+def noall_load : Flag<["-"], "noall_load">,
+     HelpText<"Unnecessary option: this is already the default">,
+     Group<grp_deprecated>;
+
+def grp_obsolete : OptionGroup<"obsolete">, HelpText<"OBSOLETE">;
+
+def y : Joined<["-"], "y">,
+     MetaVarName<"<symbol>">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def sectobjectsymbols : MultiArg<["-"], "sectobjectsymbols", 2>,
+     MetaVarName<"<segname> <sectname>">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def nofixprebinding : Flag<["-"], "nofixprebinding">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def noprebind_all_twolevel_modules : Flag<["-"], "noprebind_all_twolevel_modules">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def prebind_all_twolevel_modules : Flag<["-"], "prebind_all_twolevel_modules">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def prebind_allow_overlap : Flag<["-"], "prebind_allow_overlap">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def noprebind : Flag<["-"], "noprebind">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def sect_diff_relocs : Separate<["-"], "sect_diff_relocs">,
+     MetaVarName<"<treatment>">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def A : Separate<["-"], "A">,
+     MetaVarName<"<basefile>">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def b : Flag<["-"], "b">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def Sn : Flag<["-"], "Sn">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def Si : Flag<["-"], "Si">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def Sp : Flag<["-"], "Sp">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def X : Flag<["-"], "X">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def s : Flag<["-"], "s">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def m : Flag<["-"], "m">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def Y : Separate<["-"], "Y">,
+     MetaVarName<"<number>">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def nomultidefs : Flag<["-"], "nomultidefs">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def multiply_defined_unused : Separate<["-"], "multiply_defined_unused">,
+     MetaVarName<"<treatment>">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def multiply_defined : Separate<["-"], "multiply_defined">,
+     MetaVarName<"<treatment>">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def private_bundle : Flag<["-"], "private_bundle">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def seg_addr_table_filename : Separate<["-"], "seg_addr_table_filename">,
+     MetaVarName<"<path>">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def sectorder_detail : Flag<["-"], "sectorder_detail">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def no_compact_linkedit : Flag<["-"], "no_compact_linkedit">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def dependent_dr_info : Flag<["-"], "dependent_dr_info">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def no_dependent_dr_info : Flag<["-"], "no_dependent_dr_info">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def seglinkedit : Flag<["-"], "seglinkedit">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def noseglinkedit : Flag<["-"], "noseglinkedit">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def fvmlib : Flag<["-"], "fvmlib">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+def run_init_lazily : Flag<["-"], "run_init_lazily">,
+     HelpText<"This option is obsolete in ld64">,
+     Group<grp_obsolete>;
+
+def grp_undocumented : OptionGroup<"undocumented">, HelpText<"UNDOCUMENTED">;
+
+def add_ast_path : Flag<["-"], "add_ast_path">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def add_linker_option : Flag<["-"], "add_linker_option">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def add_source_version : Flag<["-"], "add_source_version">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_source_version : Flag<["-"], "no_source_version">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def add_split_seg_info : Flag<["-"], "add_split_seg_info">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def allow_dead_duplicates : Flag<["-"], "allow_dead_duplicates">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def allow_simulator_linking_to_macosx_dylibs : Flag<["-"], "allow_simulator_linking_to_macosx_dylibs">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def bitcode_process_mode : Flag<["-"], "bitcode_process_mode">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def bitcode_verify : Flag<["-"], "bitcode_verify">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def classic_linker : Flag<["-"], "classic_linker">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def data_const : Flag<["-"], "data_const">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_data_const : Flag<["-"], "no_data_const">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def data_in_code_info : Flag<["-"], "data_in_code_info">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_data_in_code_info : Flag<["-"], "no_data_in_code_info">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def debug_snapshot : Flag<["-"], "debug_snapshot">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def demangle : Flag<["-"], "demangle">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def dependency_info : Flag<["-"], "dependency_info">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def dyld_env : Flag<["-"], "dyld_env">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def encryptable : Flag<["-"], "encryptable">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def executable_path : Flag<["-"], "executable_path">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def fixup_chains : Flag<["-"], "fixup_chains">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def fixup_chains_section : Flag<["-"], "fixup_chains_section">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def flto_codegen_only : Flag<["-"], "flto-codegen-only">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def force_load_swift_libs : Flag<["-"], "force_load_swift_libs">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def force_symbol_not_weak : Flag<["-"], "force_symbol_not_weak">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def force_symbols_coalesce_list : Flag<["-"], "force_symbols_coalesce_list">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def force_symbols_not_weak_list : Flag<["-"], "force_symbols_not_weak_list">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def force_symbols_weak_list : Flag<["-"], "force_symbols_weak_list">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def force_symbol_weak : Flag<["-"], "force_symbol_weak">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def function_starts : Flag<["-"], "function_starts">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def i : Flag<["-"], "i">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def ignore_auto_link : Flag<["-"], "ignore_auto_link">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def ignore_optimization_hints : Flag<["-"], "ignore_optimization_hints">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def init_offsets : Flag<["-"], "init_offsets">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def keep_dwarf_unwind : Flag<["-"], "keep_dwarf_unwind">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_keep_dwarf_unwind : Flag<["-"], "no_keep_dwarf_unwind">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def kext : Flag<["-"], "kext">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def kext_objects_dir : Flag<["-"], "kext_objects_dir">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_kext_objects : Flag<["-"], "no_kext_objects">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def kexts_use_stubs : Flag<["-"], "kexts_use_stubs">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def maccatalyst_version_min : Flag<["-"], "maccatalyst_version_min">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def iosmac_version_min : Flag<["-"], "iosmac_version_min">,
+     Alias<maccatalyst_version_min>,
+     HelpText<"Alias for -maccatalyst_version_min">;
+def uikitformac_version_min : Flag<["-"], "uikitformac_version_min">,
+     Alias<maccatalyst_version_min>,
+     HelpText<"Alias for -maccatalyst_version_min">;
+def mcpu : Flag<["-"], "mcpu">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def mllvm : Flag<["-"], "mllvm">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_compact_unwind : Flag<["-"], "no_compact_unwind">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_dtrace_dof : Flag<["-"], "no_dtrace_dof">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_encryption : Flag<["-"], "no_encryption">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def no_new_main : Flag<["-"], "no_new_main">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def objc_abi_version : Flag<["-"], "objc_abi_version">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def pause : Flag<["-"], "pause">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def random_uuid : Flag<["-"], "random_uuid">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def save_temps : Flag<["-"], "save-temps">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def sdk_version : Flag<["-"], "sdk_version">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def simulator_support : Flag<["-"], "simulator_support">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def snapshot_dir : Flag<["-"], "snapshot_dir">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def source_version : Flag<["-"], "source_version">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def text_exec : Flag<["-"], "text_exec">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def threaded_starts_section : Flag<["-"], "threaded_starts_section">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def twolevel_namespace : Flag<["-"], "twolevel_namespace">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def verbose_optimization_hints : Flag<["-"], "verbose_optimization_hints">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+def version_load_command : Flag<["-"], "version_load_command">,
+     HelpText<"This option is undocumented in ld64">,
+     Group<grp_undocumented>;
+
+def grp_ignored : OptionGroup<"ignored">, HelpText<"IGNORED">;
+
+def M : Flag<["-"], "M">,
+     HelpText<"This option is ignored in ld64">,
+     Group<grp_ignored>;
+def new_linker : Flag<["-"], "new_linker">,
+     HelpText<"This option is ignored in ld64">,
+     Group<grp_ignored>;
diff --git a/lld/test/MachO/platform-version.test b/lld/test/MachO/platform-version.test
--- a/lld/test/MachO/platform-version.test
+++ b/lld/test/MachO/platform-version.test
@@ -1,16 +1,51 @@
 # RUN: not lld -flavor darwinnew -platform_version 2>&1 \
-# RUN:     | FileCheck --check-prefix=FAIL %s
+# RUN:     | FileCheck --check-prefix=MISSING %s
 # RUN: not lld -flavor darwinnew -platform_version macos 2>&1 \
-# RUN:     | FileCheck --check-prefix=FAIL %s
+# RUN:     | FileCheck --check-prefix=MISSING %s
 # RUN: not lld -flavor darwinnew -platform_version macos 10.15 2>&1 \
-# RUN:     | FileCheck --check-prefix=FAIL %s
-# RUN: not lld -flavor darwinnew -platform_version macos -lfoo 10.15 2>&1 \
-# RUN:     | FileCheck --check-prefix=FAIL %s
-# RUN: not lld -flavor darwinnew -platform_version macos 10.15 10.15.4 2>&1 \
-# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN:     | FileCheck --check-prefix=MISSING %s
 # RUN: not lld -flavor darwinnew -platform_version macos 10.15 10.15.4 foobar 2>&1 \
 # RUN:     | FileCheck --check-prefix=FAIL_FILE %s
+# RUN: not lld -flavor darwinnew -platform_version macos 10.15 10.15.4 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version ios 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version tvos 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version watchos 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version bridgeos 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version mac-catalyst 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version ios-sim 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version tvos-sim 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version watchos-sim 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version driverkit 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version 5 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version 5 1.2 '' 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version 5 1.2 . 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version 5 1.2 3.4.5.6 2>&1 \
+# RUN:     | FileCheck --check-prefix=GOOD %s
+# RUN: not lld -flavor darwinnew -platform_version 0 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=USAGE %s
+# RUN: not lld -flavor darwinnew -platform_version 11 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=USAGE %s
+# RUN: not lld -flavor darwinnew -platform_version nachos 1.2 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=USAGE %s
+# RUN: not lld -flavor darwinnew -platform_version macos -lfoo 3.4.5 2>&1 \
+# RUN:     | FileCheck --check-prefix=USAGE %s
 
-FAIL: usage: -platform_version platform min_version sdk_version
+USAGE: usage: -platform_version <platform> <min_version> <sdk_version>
+USAGE: undefined symbol: _main
+MISSING: error: -platform_version: missing argument
+MISSING: undefined symbol: _main
 GOOD: undefined symbol: _main
 FAIL_FILE: cannot open foobar
diff --git a/llvm/include/llvm/Option/Option.h b/llvm/include/llvm/Option/Option.h
--- a/llvm/include/llvm/Option/Option.h
+++ b/llvm/include/llvm/Option/Option.h
@@ -135,6 +135,18 @@
     return Ret;
   }
 
+  /// Get the help text for this option.
+  StringRef getHelpText() const {
+    assert(Info && "Must have a valid info!");
+    return Info->HelpText;
+  }
+
+  /// Get the meta-variable list for this option.
+  StringRef getMetaVar() const {
+    assert(Info && "Must have a valid info!");
+    return Info->MetaVar;
+  }
+
   unsigned getNumArgs() const { return Info->Param; }
 
   bool hasNoOptAsInput() const { return Info->Flags & RenderAsInput;}