diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -434,6 +434,7 @@
   HelpText<"Pass the comma separated arguments in <arg> to the assembler">,
   MetaVarName<"<arg>">;
 def Wall : Flag<["-"], "Wall">, Group<W_Group>, Flags<[CC1Option, HelpHidden]>;
+def feverything : Flag<["-"], "feverything">, Group<f_Group>, Flags<[CC1Option, HelpHidden]>;
 def WCL4 : Flag<["-"], "WCL4">, Group<W_Group>, Flags<[CC1Option, HelpHidden]>;
 def Wdeprecated : Flag<["-"], "Wdeprecated">, Group<W_Group>, Flags<[CC1Option]>,
   HelpText<"Enable warnings for deprecated constructs and define __DEPRECATED">;
diff --git a/clang/include/clang/Frontend/CompilerInvocation.h b/clang/include/clang/Frontend/CompilerInvocation.h
--- a/clang/include/clang/Frontend/CompilerInvocation.h
+++ b/clang/include/clang/Frontend/CompilerInvocation.h
@@ -31,6 +31,8 @@
 namespace opt {
 
 class ArgList;
+class InputArgList;
+class OptTable;
 
 } // namespace opt
 
@@ -61,6 +63,8 @@
                          bool DefaultDiagColor = true,
                          bool DefaultShowOpt = true);
 
+void ParseFEverything(llvm::opt::OptTable *Opts, llvm::opt::InputArgList *Args);
+
 class CompilerInvocationBase {
 public:
   /// Options controlling the language variant.
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5389,6 +5389,9 @@
     }
   }
 
+  if (Args.hasArg(options::OPT_feverything))
+    CmdArgs.push_back("-feverything");
+
   if (Args.hasFlag(options::OPT_faddrsig, options::OPT_fno_addrsig,
                    (TC.getTriple().isOSBinFormatELF() ||
                     TC.getTriple().isOSBinFormatCOFF()) &&
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -1427,6 +1427,25 @@
   return Success;
 }
 
+void clang::ParseFEverything(llvm::opt::OptTable *Opts,
+                             llvm::opt::InputArgList *Args) {
+  if (!Args->hasArg(options::OPT_feverything))
+    return;
+  const unsigned f_group = Opts->getOption(OPT_f_Group).getID();
+  unsigned i = Opts->getFirstSearchableIndex();
+  const unsigned len = Opts->getNumOptions();
+  for (; i != len; ++i) {
+    const Option &opt = Opts->getOption(i);
+    const Option group = opt.getGroup();
+    // TODO: add more groups
+    if (group.isValid() && group.getID() == f_group) {
+      const std::string Flag = opt.getPrefixedName();
+      if (Flag.back() != '=' && Flag.back() != '-')
+        Args->append(new Arg(opt, Flag, Args->MakeIndex(Flag), Flag.c_str()));
+    }
+  }
+}
+
 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
                                 DiagnosticsEngine *Diags,
                                 bool DefaultDiagColor, bool DefaultShowOpt) {
@@ -3247,6 +3266,7 @@
   InputArgList Args =
       Opts->ParseArgs(llvm::makeArrayRef(ArgBegin, ArgEnd), MissingArgIndex,
                       MissingArgCount, IncludedFlagsBitmask);
+  ParseFEverything(Opts.get(), &Args);
   LangOptions &LangOpts = *Res.getLangOpts();
 
   // Check for missing argument error.
diff --git a/llvm/include/llvm/Option/OptTable.h b/llvm/include/llvm/Option/OptTable.h
--- a/llvm/include/llvm/Option/OptTable.h
+++ b/llvm/include/llvm/Option/OptTable.h
@@ -88,6 +88,8 @@
   /// Return the total number of option classes.
   unsigned getNumOptions() const { return OptionInfos.size(); }
 
+  unsigned getFirstSearchableIndex() const { return FirstSearchableIndex; }
+
   /// Get the given Opt's Option instance, lazily creating it
   /// if necessary.
   ///