[NFC] Judge if we have std c++ modules in RenderModulesOptions

This patch moves the judgement if the std c++ modules feature is enabled
into the RenderModulesOptions function. It simplify the code a little
bit further more. It also helps further patches.

diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
index 2dfd815..da8b715 100644 (file)
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -3660,10 +3660,19 @@ bool Driver::getDefaultModuleCachePath(SmallVectorImpl<char> &Result) {
   return false;
 }
 
-static void RenderModulesOptions(Compilation &C, const Driver &D,
+static bool RenderModulesOptions(Compilation &C, const Driver &D,
                                  const ArgList &Args, const InputInfo &Input,
-                                 const InputInfo &Output,
-                                 ArgStringList &CmdArgs, bool &HaveModules) {
+                                 const InputInfo &Output, const Arg *Std,
+                                 ArgStringList &CmdArgs) {
+  bool IsCXX = types::isCXX(Input.getType());
+  // FIXME: Find a better way to determine whether the input has standard c++
+  // modules support by default.
+  bool HaveStdCXXModules =
+      IsCXX && Std &&
+      (Std->containsValue("c++2a") || Std->containsValue("c++20") ||
+       Std->containsValue("c++2b") || Std->containsValue("c++latest"));
+  bool HaveModules = HaveStdCXXModules;
+
   // -fmodules enables the use of precompiled modules (off by default).
   // Users can pass -fno-cxx-modules to turn off modules support for
   // C++/Objective-C++ programs.
@@ -3671,7 +3680,7 @@ static void RenderModulesOptions(Compilation &C, const Driver &D,
   if (Args.hasFlag(options::OPT_fmodules, options::OPT_fno_modules, false)) {
     bool AllowedInCXX = Args.hasFlag(options::OPT_fcxx_modules,
                                      options::OPT_fno_cxx_modules, true);
-    if (AllowedInCXX || !types::isCXX(Input.getType())) {
+    if (AllowedInCXX || !IsCXX) {
       CmdArgs.push_back("-fmodules");
       HaveClangModules = true;
     }
@@ -3842,6 +3851,8 @@ static void RenderModulesOptions(Compilation &C, const Driver &D,
     Args.ClaimAllArgs(options::OPT_fno_modules_validate_system_headers);
     Args.ClaimAllArgs(options::OPT_fmodules_disable_diagnostic_validation);
   }
+
+  return HaveModules;
 }
 
 static void RenderCharacterOptions(const ArgList &Args, const llvm::Triple &T,
@@ -6688,12 +6699,8 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   Args.AddLastArg(CmdArgs, options::OPT_finline_max_stacksize_EQ);
 
-  // FIXME: Find a better way to determine whether the language has modules
-  // support by default, or just assume that all languages do.
   bool HaveModules =
-      Std && (Std->containsValue("c++2a") || Std->containsValue("c++20") ||
-              Std->containsValue("c++2b") || Std->containsValue("c++latest"));
-  RenderModulesOptions(C, D, Args, Input, Output, CmdArgs, HaveModules);
+      RenderModulesOptions(C, D, Args, Input, Output, Std, CmdArgs);
 
   if (Args.hasFlag(options::OPT_fpch_validate_input_files_content,
                    options::OPT_fno_pch_validate_input_files_content, false))