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

Depends on D84187

Reviewed By: dexonsmith

Original patch by Daniel Grumberg.

Differential Revision: https://reviews.llvm.org/D84188

Author: jansvoboda11

clang/include/clang/Driver/Options.td

@@ -3354,7 +3354,8 @@ 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>;
 

clang/lib/Frontend/CompilerInvocation.cpp

@@ -1876,10 +1876,6 @@ bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,
   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.
 ///
@@ -3839,7 +3835,6 @@ bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Res,
   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);