[clang][cli] Port FileSystem options to new option parsing system

[jansvoboda11]

Summary

Depends on D84187

[jansvoboda11]

Taking over this patch as Daniel is no longer involved.

[dexonsmith]

LGTM.

[jansvoboda11]

Changes involved moving working_directory and working_directory_EQ back to their original lines.

clang/include/clang/Driver/Options.td

def fno_integrated_cc1 : Flag<["-"], "fno-integrated-cc1">,
                          Flags<[CoreOption, NoXarchOption]>, Group<f_Group>,
                          HelpText<"Spawn a separate process for each cc1">;
 
 def : Flag<["-"], "integrated-as">, Alias<fintegrated_as>, Flags<[NoXarchOption]>;
 def : Flag<["-"], "no-integrated-as">, Alias<fno_integrated_as>,
       Flags<[CC1Option, NoXarchOption]>;
 
 def working_directory : JoinedOrSeparate<["-"], "working-directory">, Flags<[CC1Option]>,
-  HelpText<"Resolve file paths relative to the specified directory">;
+  HelpText<"Resolve file paths relative to the specified directory">,
+  MarshallingInfoString<"FileSystemOpts.WorkingDir">;
 def working_directory_EQ : Joined<["-"], "working-directory=">, Flags<[CC1Option]>,
   Alias<working_directory>;
 
 // Double dash options, which are usually an alias for one of the previous
 // options.
 
 def _mhwdiv_EQ : Joined<["--"], "mhwdiv=">, Alias<mhwdiv_EQ>;
 def _mhwdiv : Separate<["--"], "mhwdiv">, Alias<mhwdiv_EQ>;

clang/lib/Frontend/CompilerInvocation.cpp

bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
   Opts.UndefPrefixes = Args.getAllArgValues(OPT_Wundef_prefix_EQ);
 
   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);
   addDiagnosticArgs(Args, OPT_R_Group, OPT_R_value_Group, Opts.Remarks);
 
   return Success;
 }
 
-static void ParseFileSystemArgs(FileSystemOptions &Opts, ArgList &Args) {
-  Opts.WorkingDir = std::string(Args.getLastArgValue(OPT_working_directory));
-}
-
 /// Parse the argument to the -ftest-module-file-extension
 /// command-line argument.
 ///
 /// \returns true on error, false on success.
 static bool parseTestModuleFileExtensionArg(StringRef Arg,
                                             std::string &BlockName,
                                             unsigned &MajorVersion,
                                             unsigned &MinorVersion,
bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
   if (!Res.getDependencyOutputOpts().OutputFile.empty() &&
       Res.getDependencyOutputOpts().Targets.empty()) {
     Diags.Report(diag::err_fe_dependency_file_requires_MT);
     Success = false;
   }
   Success &= ParseDiagnosticArgs(Res.getDiagnosticOpts(), Args, &Diags,
                                  /*DefaultDiagColor=*/false);
   ParseCommentArgs(LangOpts.CommentOpts, Args);
-  ParseFileSystemArgs(Res.getFileSystemOpts(), Args);
   // FIXME: We shouldn't have to pass the DashX option around here
   InputKind DashX = ParseFrontendArgs(Res.getFrontendOpts(), Args, Diags,
                                       LangOpts.IsHeaderFile);
   ParseTargetArgs(Res.getTargetOpts(), Args, Diags);
   Success &= ParseCodeGenArgs(Res.getCodeGenOpts(), Args, DashX, Diags,
                               Res.getTargetOpts(), Res.getFrontendOpts());
   ParseHeaderSearchArgs(Res.getHeaderSearchOpts(), Args,
                         Res.getFileSystemOpts().WorkingDir);