[clang] [clang][driver] Improve Clang-CL support for C++20 standard modules (PR #98761)

[Sharadh Rajaraman via cfe-commits]

https://github.com/sharadhr updated https://github.com/llvm/llvm-project/pull/98761

>From 1fed92a00f0d732a2575861c2bf6a6d053407255 Mon Sep 17 00:00:00 2001
From: Sharadh Rajaraman <r.sharadh at outlook.sg>
Date: Sat, 13 Jul 2024 19:25:47 +0100
Subject: [PATCH 1/2] Allow `--precompile` and `-fprebuilt-module-path` to be
 passed directly into CL driver without `/clang:` prefix

---
 clang/include/clang/Driver/Options.td | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 4ab8638175dd3..ca7cfef8453a0 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -3085,7 +3085,7 @@ def fmodules_user_build_path : Separate<["-"], "fmodules-user-build-path">, Grou
   HelpText<"Specify the module user build path">,
   MarshallingInfoString<HeaderSearchOpts<"ModuleUserBuildPath">>;
 def fprebuilt_module_path : Joined<["-"], "fprebuilt-module-path=">, Group<i_Group>,
-  Flags<[]>, Visibility<[ClangOption, CC1Option]>,
+  Flags<[]>, Visibility<[ClangOption, CLOption, CC1Option]>,
   MetaVarName<"<directory>">,
   HelpText<"Specify the prebuilt module path">;
 defm prebuilt_implicit_modules : BoolFOption<"prebuilt-implicit-modules",
@@ -5874,6 +5874,7 @@ def _output : Separate<["--"], "output">, Alias<o>;
 def _param : Separate<["--"], "param">, Group<CompileOnly_Group>;
 def _param_EQ : Joined<["--"], "param=">, Alias<_param>;
 def _precompile : Flag<["--"], "precompile">, Flags<[NoXarchOption]>,
+  Visibility<[ClangOption, CLOption]>,
   Group<Action_Group>, HelpText<"Only precompile the input">;
 def _prefix_EQ : Joined<["--"], "prefix=">, Alias<B>;
 def _prefix : Separate<["--"], "prefix">, Alias<B>;

>From 182cff89e777b6f22d34fb074c79814e521a7a88 Mon Sep 17 00:00:00 2001
From: Sharadh Rajaraman <r.sharadh at outlook.sg>
Date: Sun, 14 Jul 2024 11:05:57 +0100
Subject: [PATCH 2/2] `TY_ModuleFile` should be a 'CXX' file type

---
 clang/lib/Driver/Types.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Driver/Types.cpp b/clang/lib/Driver/Types.cpp
index a7b6b9000e1d2..c6a03f4491dd7 100644
--- a/clang/lib/Driver/Types.cpp
+++ b/clang/lib/Driver/Types.cpp
@@ -242,7 +242,7 @@ bool types::isCXX(ID Id) {
   case TY_CXXHUHeader:
   case TY_PP_CXXHeaderUnit:
   case TY_ObjCXXHeader: case TY_PP_ObjCXXHeader:
-  case TY_CXXModule: case TY_PP_CXXModule:
+  case TY_CXXModule: case TY_PP_CXXModule: case TY_ModuleFile:
   case TY_PP_CLCXX:
   case TY_CUDA: case TY_PP_CUDA: case TY_CUDA_DEVICE:
   case TY_HIP: