Revert "[Flang][Driver] Add -print-resource-dir command line flag to emit Flang's resource directory" (#96557)

Reverts #90886

These changes broke linking to compiler-rt on Windows

Author: DavidTruby

clang/include/clang/Driver/Driver.h

@@ -747,9 +747,6 @@ class Driver {
   /// option.
   void setDriverMode(StringRef DriverModeValue);
 
-  /// Set the resource directory, depending on which driver is being used.
-  void setResourceDirectory();
-
   /// Parse the \p Args list for LTO options and record the type of LTO
   /// compilation based on which -f(no-)?lto(=.*)? option occurs last.
   void setLTOMode(const llvm::opt::ArgList &Args);

clang/include/clang/Driver/Options.td

@@ -5535,10 +5535,7 @@ def print_prog_name_EQ : Joined<["-", "--"], "print-prog-name=">,
   Visibility<[ClangOption, CLOption]>;
 def print_resource_dir : Flag<["-", "--"], "print-resource-dir">,
   HelpText<"Print the resource directory pathname">,
-  HelpTextForVariants<[FlangOption],
-                      "Print the resource directory pathname that contains lib and "
-                      "include directories with the runtime libraries and MODULE files.">,
-  Visibility<[ClangOption, CLOption, FlangOption]>;
+  Visibility<[ClangOption, CLOption]>;
 def print_search_dirs : Flag<["-", "--"], "print-search-dirs">,
   HelpText<"Print the paths used for finding libraries and programs">,
   Visibility<[ClangOption, CLOption]>;

clang/lib/Driver/Driver.cpp

@@ -229,6 +229,9 @@ Driver::Driver(StringRef ClangExecutable, StringRef TargetTriple,
     UserConfigDir = static_cast<std::string>(P);
   }
 #endif
+
+  // Compute the path to the resource directory.
+  ResourceDir = GetResourcesPath(ClangExecutable, CLANG_RESOURCE_DIR);
 }
 
 void Driver::setDriverMode(StringRef Value) {
@@ -247,24 +250,6 @@ void Driver::setDriverMode(StringRef Value) {
     Diag(diag::err_drv_unsupported_option_argument) << OptName << Value;
 }
 
-void Driver::setResourceDirectory() {
-  // Compute the path to the resource directory, depending on the driver mode.
-  switch (Mode) {
-  case GCCMode:
-  case GXXMode:
-  case CPPMode:
-  case CLMode:
-  case DXCMode:
-    ResourceDir = GetResourcesPath(ClangExecutable, CLANG_RESOURCE_DIR);
-    break;
-  case FlangMode:
-    SmallString<64> customResourcePathRelativeToDriver{".."};
-    ResourceDir =
-        GetResourcesPath(ClangExecutable, customResourcePathRelativeToDriver);
-    break;
-  }
-}
-
 InputArgList Driver::ParseArgStrings(ArrayRef<const char *> ArgStrings,
                                      bool UseDriverMode, bool &ContainsError) {
   llvm::PrettyStackTraceString CrashInfo("Command line argument parsing");
@@ -1217,7 +1202,6 @@ Compilation *Driver::BuildCompilation(ArrayRef<const char *> ArgList) {
   if (!DriverMode.empty())
     setDriverMode(DriverMode);
 
-  setResourceDirectory();
   // FIXME: What are we going to do with -V and -b?
 
   // Arguments specified in command line.