[clang-tools-extra] a1153cd - Revert "[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)"

Sylvestre Ledru via cfe-commits cfe-commits at lists.llvm.org
Thu Nov 21 04:04:54 PST 2024


Author: Sylvestre Ledru
Date: 2024-11-21T13:04:30+01:00
New Revision: a1153cd6fedd4c906a9840987934ca4712e34cb2

URL: https://github.com/llvm/llvm-project/commit/a1153cd6fedd4c906a9840987934ca4712e34cb2
DIFF: https://github.com/llvm/llvm-project/commit/a1153cd6fedd4c906a9840987934ca4712e34cb2.diff

LOG: Revert "[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)"

Reverted for causing:
https://github.com/llvm/llvm-project/issues/117145

This reverts commit bdd10d9d249bd1c2a45e3de56a5accd97e953458.

Added: 
    

Modified: 
    clang-tools-extra/clang-include-fixer/IncludeFixer.cpp
    clang-tools-extra/clangd/Compiler.cpp
    clang-tools-extra/clangd/ModulesBuilder.cpp
    clang-tools-extra/clangd/Preamble.cpp
    clang-tools-extra/include-cleaner/unittests/RecordTest.cpp
    clang/include/clang/Frontend/CompilerInstance.h
    clang/lib/Frontend/CompilerInstance.cpp
    clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
    clang/lib/Frontend/Rewrite/FrontendActions.cpp
    clang/lib/Interpreter/Interpreter.cpp
    clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp
    clang/lib/Testing/TestAST.cpp
    clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
    clang/lib/Tooling/Tooling.cpp
    clang/tools/c-index-test/core_main.cpp
    clang/tools/clang-import-test/clang-import-test.cpp
    clang/tools/clang-installapi/ClangInstallAPI.cpp
    clang/tools/clang-scan-deps/ClangScanDeps.cpp
    clang/tools/diagtool/ShowEnabledWarnings.cpp
    clang/tools/driver/cc1_main.cpp
    clang/tools/libclang/CIndex.cpp
    clang/tools/libclang/Indexing.cpp
    clang/unittests/AST/ExternalASTSourceTest.cpp
    clang/unittests/CodeGen/TestCompiler.h
    clang/unittests/Driver/DXCModeTest.cpp
    clang/unittests/Driver/ToolChainTest.cpp
    clang/unittests/Frontend/ASTUnitTest.cpp
    clang/unittests/Frontend/CodeGenActionTest.cpp
    clang/unittests/Frontend/CompilerInstanceTest.cpp
    clang/unittests/Frontend/CompilerInvocationTest.cpp
    clang/unittests/Frontend/FrontendActionTest.cpp
    clang/unittests/Frontend/OutputStreamTest.cpp
    clang/unittests/Frontend/PCHPreambleTest.cpp
    clang/unittests/Frontend/ReparseWorkingDirTest.cpp
    clang/unittests/Frontend/UtilsTest.cpp
    clang/unittests/Sema/SemaNoloadLookupTest.cpp
    clang/unittests/Serialization/ForceCheckFileInputTest.cpp
    clang/unittests/Serialization/ModuleCacheTest.cpp
    clang/unittests/Serialization/NoCommentsTest.cpp
    clang/unittests/Serialization/PreambleInNamedModulesTest.cpp
    clang/unittests/Serialization/VarDeclConstantInitTest.cpp
    clang/unittests/Support/TimeProfilerTest.cpp
    clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
    clang/unittests/Tooling/ToolingTest.cpp

Removed: 
    


################################################################################
diff  --git a/clang-tools-extra/clang-include-fixer/IncludeFixer.cpp b/clang-tools-extra/clang-include-fixer/IncludeFixer.cpp
index bba8f8acc77da9..354f35cbadbeb9 100644
--- a/clang-tools-extra/clang-include-fixer/IncludeFixer.cpp
+++ b/clang-tools-extra/clang-include-fixer/IncludeFixer.cpp
@@ -95,8 +95,7 @@ bool IncludeFixerActionFactory::runInvocation(
 
   // Create the compiler's actual diagnostics engine. We want to drop all
   // diagnostics here.
-  Compiler.createDiagnostics(Files->getVirtualFileSystem(),
-                             new clang::IgnoringDiagConsumer,
+  Compiler.createDiagnostics(new clang::IgnoringDiagConsumer,
                              /*ShouldOwnClient=*/true);
   Compiler.createSourceManager(*Files);
 

diff  --git a/clang-tools-extra/clangd/Compiler.cpp b/clang-tools-extra/clangd/Compiler.cpp
index 161cc9ae0ca365..c60ab8e1b8062a 100644
--- a/clang-tools-extra/clangd/Compiler.cpp
+++ b/clang-tools-extra/clangd/Compiler.cpp
@@ -110,8 +110,8 @@ buildCompilerInvocation(const ParseInputs &Inputs, clang::DiagnosticConsumer &D,
   CIOpts.VFS = Inputs.TFS->view(Inputs.CompileCommand.Directory);
   CIOpts.CC1Args = CC1Args;
   CIOpts.RecoverOnError = true;
-  CIOpts.Diags = CompilerInstance::createDiagnostics(
-      *CIOpts.VFS, new DiagnosticOptions, &D, false);
+  CIOpts.Diags =
+      CompilerInstance::createDiagnostics(new DiagnosticOptions, &D, false);
   CIOpts.ProbePrecompiled = false;
   std::unique_ptr<CompilerInvocation> CI = createInvocation(ArgStrs, CIOpts);
   if (!CI)
@@ -148,7 +148,7 @@ prepareCompilerInstance(std::unique_ptr<clang::CompilerInvocation> CI,
   auto Clang = std::make_unique<CompilerInstance>(
       std::make_shared<PCHContainerOperations>());
   Clang->setInvocation(std::move(CI));
-  Clang->createDiagnostics(*VFS, &DiagsClient, false);
+  Clang->createDiagnostics(&DiagsClient, false);
 
   if (auto VFSWithRemapping = createVFSFromCompilerInvocation(
           Clang->getInvocation(), Clang->getDiagnostics(), VFS))

diff  --git a/clang-tools-extra/clangd/ModulesBuilder.cpp b/clang-tools-extra/clangd/ModulesBuilder.cpp
index 29508901f85bba..2bce3a20825616 100644
--- a/clang-tools-extra/clangd/ModulesBuilder.cpp
+++ b/clang-tools-extra/clangd/ModulesBuilder.cpp
@@ -188,8 +188,7 @@ bool IsModuleFileUpToDate(PathRef ModuleFilePath,
 
   clang::clangd::IgnoreDiagnostics IgnoreDiags;
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions,
-                                          &IgnoreDiags,
+      CompilerInstance::createDiagnostics(new DiagnosticOptions, &IgnoreDiags,
                                           /*ShouldOwnClient=*/false);
 
   LangOptions LangOpts;

diff  --git a/clang-tools-extra/clangd/Preamble.cpp b/clang-tools-extra/clangd/Preamble.cpp
index ce88ec0eb88c1b..c14c4d1ba103f8 100644
--- a/clang-tools-extra/clangd/Preamble.cpp
+++ b/clang-tools-extra/clangd/Preamble.cpp
@@ -613,9 +613,8 @@ buildPreamble(PathRef FileName, CompilerInvocation CI,
         for (const auto &L : ASTListeners)
           L->sawDiagnostic(D, Diag);
       });
-  auto VFS = Inputs.TFS->view(Inputs.CompileCommand.Directory);
   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> PreambleDiagsEngine =
-      CompilerInstance::createDiagnostics(*VFS, &CI.getDiagnosticOpts(),
+      CompilerInstance::createDiagnostics(&CI.getDiagnosticOpts(),
                                           &PreambleDiagnostics,
                                           /*ShouldOwnClient=*/false);
   const Config &Cfg = Config::current();
@@ -652,6 +651,7 @@ buildPreamble(PathRef FileName, CompilerInvocation CI,
         for (const auto &L : ASTListeners)
           L->beforeExecute(CI);
       });
+  auto VFS = Inputs.TFS->view(Inputs.CompileCommand.Directory);
   llvm::SmallString<32> AbsFileName(FileName);
   VFS->makeAbsolute(AbsFileName);
   auto StatCache = std::make_shared<PreambleFileStatusCache>(AbsFileName);

diff  --git a/clang-tools-extra/include-cleaner/unittests/RecordTest.cpp b/clang-tools-extra/include-cleaner/unittests/RecordTest.cpp
index b1bbb2eb82414c..b5a7b9720903eb 100644
--- a/clang-tools-extra/include-cleaner/unittests/RecordTest.cpp
+++ b/clang-tools-extra/include-cleaner/unittests/RecordTest.cpp
@@ -609,24 +609,23 @@ TEST_F(PragmaIncludeTest, ExportInUnnamedBuffer) {
   )cpp";
   Inputs.ExtraFiles["foo.h"] = "";
 
-  // Create unnamed memory buffers for all the files.
-  auto VFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
-  VFS->addFile(Filename, /*ModificationTime=*/0,
-               llvm::MemoryBuffer::getMemBufferCopy(Code, /*BufferName=*/""));
-  for (const auto &Extra : Inputs.ExtraFiles)
-    VFS->addFile(Extra.getKey(), /*ModificationTime=*/0,
-                 llvm::MemoryBuffer::getMemBufferCopy(Extra.getValue(),
-                                                      /*BufferName=*/""));
-
   auto Clang = std::make_unique<CompilerInstance>(
       std::make_shared<PCHContainerOperations>());
-  Clang->createDiagnostics(*VFS);
+  Clang->createDiagnostics();
 
   Clang->setInvocation(std::make_unique<CompilerInvocation>());
   ASSERT_TRUE(CompilerInvocation::CreateFromArgs(
       Clang->getInvocation(), {Filename.data()}, Clang->getDiagnostics(),
       "clang"));
 
+  // Create unnamed memory buffers for all the files.
+  auto VFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
+  VFS->addFile(Filename, /*ModificationTime=*/0,
+               llvm::MemoryBuffer::getMemBufferCopy(Code, /*BufferName=*/""));
+  for (const auto &Extra : Inputs.ExtraFiles)
+    VFS->addFile(Extra.getKey(), /*ModificationTime=*/0,
+                 llvm::MemoryBuffer::getMemBufferCopy(Extra.getValue(),
+                                                      /*BufferName=*/""));
   auto *FM = Clang->createFileManager(VFS);
   ASSERT_TRUE(Clang->ExecuteAction(*Inputs.MakeAction()));
   EXPECT_THAT(

diff  --git a/clang/include/clang/Frontend/CompilerInstance.h b/clang/include/clang/Frontend/CompilerInstance.h
index 1220a4e29471d1..338eb3c6bd028d 100644
--- a/clang/include/clang/Frontend/CompilerInstance.h
+++ b/clang/include/clang/Frontend/CompilerInstance.h
@@ -675,17 +675,13 @@ class CompilerInstance : public ModuleLoader {
   /// Note that this routine also replaces the diagnostic client,
   /// allocating one if one is not provided.
   ///
-  /// \param VFS is used for any IO needed when creating DiagnosticsEngine. It
-  /// doesn't replace VFS in the CompilerInstance (if any).
-  ///
   /// \param Client If non-NULL, a diagnostic client that will be
   /// attached to (and, then, owned by) the DiagnosticsEngine inside this AST
   /// unit.
   ///
   /// \param ShouldOwnClient If Client is non-NULL, specifies whether
   /// the diagnostic object should take ownership of the client.
-  void createDiagnostics(llvm::vfs::FileSystem &VFS,
-                         DiagnosticConsumer *Client = nullptr,
+  void createDiagnostics(DiagnosticConsumer *Client = nullptr,
                          bool ShouldOwnClient = true);
 
   /// Create a DiagnosticsEngine object with a the TextDiagnosticPrinter.
@@ -706,11 +702,10 @@ class CompilerInstance : public ModuleLoader {
   /// used by some diagnostics printers (for logging purposes only).
   ///
   /// \return The new object on success, or null on failure.
-  static IntrusiveRefCntPtr<DiagnosticsEngine>
-  createDiagnostics(llvm::vfs::FileSystem &VFS, DiagnosticOptions *Opts,
-                    DiagnosticConsumer *Client = nullptr,
-                    bool ShouldOwnClient = true,
-                    const CodeGenOptions *CodeGenOpts = nullptr);
+  static IntrusiveRefCntPtr<DiagnosticsEngine> createDiagnostics(
+      DiagnosticOptions *Opts, DiagnosticConsumer *Client = nullptr,
+      bool ShouldOwnClient = true, const CodeGenOptions *CodeGenOpts = nullptr,
+      IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS = nullptr);
 
   /// Create the file manager and replace any existing one with it.
   ///

diff  --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index fbfc305ca06a04..ecc6782c7cb4fb 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -332,20 +332,23 @@ static void SetupSerializedDiagnostics(DiagnosticOptions *DiagOpts,
   }
 }
 
-void CompilerInstance::createDiagnostics(llvm::vfs::FileSystem &VFS,
-                                         DiagnosticConsumer *Client,
+void CompilerInstance::createDiagnostics(DiagnosticConsumer *Client,
                                          bool ShouldOwnClient) {
-  Diagnostics = createDiagnostics(VFS, &getDiagnosticOpts(), Client,
-                                  ShouldOwnClient, &getCodeGenOpts());
+  Diagnostics = createDiagnostics(
+      &getDiagnosticOpts(), Client, ShouldOwnClient, &getCodeGenOpts(),
+      FileMgr ? FileMgr->getVirtualFileSystemPtr() : nullptr);
 }
 
 IntrusiveRefCntPtr<DiagnosticsEngine> CompilerInstance::createDiagnostics(
-    llvm::vfs::FileSystem &VFS, DiagnosticOptions *Opts,
-    DiagnosticConsumer *Client, bool ShouldOwnClient,
-    const CodeGenOptions *CodeGenOpts) {
+    DiagnosticOptions *Opts, DiagnosticConsumer *Client, bool ShouldOwnClient,
+    const CodeGenOptions *CodeGenOpts,
+    llvm::IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS) {
   IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-      new DiagnosticsEngine(DiagID, Opts));
+  IntrusiveRefCntPtr<DiagnosticsEngine>
+      Diags(new DiagnosticsEngine(DiagID, Opts));
+
+  if (!VFS)
+    VFS = llvm::vfs::getRealFileSystem();
 
   // Create the diagnostic client for reporting errors or for
   // implementing -verify.
@@ -369,7 +372,7 @@ IntrusiveRefCntPtr<DiagnosticsEngine> CompilerInstance::createDiagnostics(
                                Opts->DiagnosticSerializationFile);
 
   // Configure our handling of diagnostics.
-  ProcessWarningOptions(*Diags, *Opts, VFS);
+  ProcessWarningOptions(*Diags, *Opts, *VFS);
 
   return Diags;
 }
@@ -1237,10 +1240,9 @@ compileModuleImpl(CompilerInstance &ImportingInstance, SourceLocation ImportLoc,
   auto &Inv = *Invocation;
   Instance.setInvocation(std::move(Invocation));
 
-  Instance.createDiagnostics(
-      ImportingInstance.getVirtualFileSystem(),
-      new ForwardingDiagnosticConsumer(ImportingInstance.getDiagnosticClient()),
-      /*ShouldOwnClient=*/true);
+  Instance.createDiagnostics(new ForwardingDiagnosticConsumer(
+                                   ImportingInstance.getDiagnosticClient()),
+                             /*ShouldOwnClient=*/true);
 
   if (llvm::is_contained(DiagOpts.SystemHeaderWarningsModules, ModuleName))
     Instance.getDiagnostics().setSuppressSystemWarnings(false);

diff  --git a/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp b/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
index d0b855fff2534c..638757a2450240 100644
--- a/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
+++ b/clang/lib/Frontend/CreateInvocationFromCommandLine.cpp
@@ -22,7 +22,6 @@
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/Option/ArgList.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 using namespace clang;
 using namespace llvm::opt;
@@ -33,9 +32,7 @@ clang::createInvocation(ArrayRef<const char *> ArgList,
   assert(!ArgList.empty());
   auto Diags = Opts.Diags
                    ? std::move(Opts.Diags)
-                   : CompilerInstance::createDiagnostics(
-                         Opts.VFS ? *Opts.VFS : *llvm::vfs::getRealFileSystem(),
-                         new DiagnosticOptions);
+                   : CompilerInstance::createDiagnostics(new DiagnosticOptions);
 
   SmallVector<const char *, 16> Args(ArgList);
 

diff  --git a/clang/lib/Frontend/Rewrite/FrontendActions.cpp b/clang/lib/Frontend/Rewrite/FrontendActions.cpp
index 5d2e1d78770959..6e1f949f543a51 100644
--- a/clang/lib/Frontend/Rewrite/FrontendActions.cpp
+++ b/clang/lib/Frontend/Rewrite/FrontendActions.cpp
@@ -247,7 +247,6 @@ class RewriteIncludesAction::RewriteImportsListener : public ASTReaderListener {
     Instance.setInvocation(
         std::make_shared<CompilerInvocation>(CI.getInvocation()));
     Instance.createDiagnostics(
-        CI.getVirtualFileSystem(),
         new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
         /*ShouldOwnClient=*/true);
     Instance.getFrontendOpts().DisableFree = false;

diff  --git a/clang/lib/Interpreter/Interpreter.cpp b/clang/lib/Interpreter/Interpreter.cpp
index 5dc67f6375098f..94f0156ec151fb 100644
--- a/clang/lib/Interpreter/Interpreter.cpp
+++ b/clang/lib/Interpreter/Interpreter.cpp
@@ -15,7 +15,6 @@
 #include "IncrementalExecutor.h"
 #include "IncrementalParser.h"
 #include "InterpreterUtils.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #ifdef __EMSCRIPTEN__
 #include "Wasm.h"
 #endif // __EMSCRIPTEN__
@@ -107,7 +106,7 @@ CreateCI(const llvm::opt::ArgStringList &Argv) {
         CompilerInvocation::GetResourcesPath(Argv[0], nullptr);
 
   // Create the actual diagnostics engine.
-  Clang->createDiagnostics(*llvm::vfs::getRealFileSystem());
+  Clang->createDiagnostics();
   if (!Clang->hasDiagnostics())
     return llvm::createStringError(llvm::errc::not_supported,
                                    "Initialization failed. "

diff  --git a/clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp b/clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp
index 168c73df393ffa..ae11fbbe32b762 100644
--- a/clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp
+++ b/clang/lib/StaticAnalyzer/Frontend/ModelInjector.cpp
@@ -78,7 +78,6 @@ void ModelInjector::onBodySynthesis(const NamedDecl *D) {
   CompilerInstance Instance(CI.getPCHContainerOperations());
   Instance.setInvocation(std::move(Invocation));
   Instance.createDiagnostics(
-      CI.getVirtualFileSystem(),
       new ForwardingDiagnosticConsumer(CI.getDiagnosticClient()),
       /*ShouldOwnClient=*/true);
 

diff  --git a/clang/lib/Testing/TestAST.cpp b/clang/lib/Testing/TestAST.cpp
index f7348aa068c51b..fe8b93851613dd 100644
--- a/clang/lib/Testing/TestAST.cpp
+++ b/clang/lib/Testing/TestAST.cpp
@@ -55,7 +55,7 @@ class StoreDiagnostics : public DiagnosticConsumer {
 // Provides "empty" ASTContext etc if we fail before parsing gets started.
 void createMissingComponents(CompilerInstance &Clang) {
   if (!Clang.hasDiagnostics())
-    Clang.createDiagnostics(*llvm::vfs::getRealFileSystem());
+    Clang.createDiagnostics();
   if (!Clang.hasFileManager())
     Clang.createFileManager();
   if (!Clang.hasSourceManager())
@@ -82,24 +82,9 @@ TestAST::TestAST(const TestInputs &In) {
   auto RecoverFromEarlyExit =
       llvm::make_scope_exit([&] { createMissingComponents(*Clang); });
 
-  std::string Filename = In.FileName;
-  if (Filename.empty())
-    Filename = getFilenameForTesting(In.Language).str();
-
-  // Set up a VFS with only the virtual file visible.
-  auto VFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
-  if (auto Err = VFS->setCurrentWorkingDirectory(In.WorkingDir))
-    ADD_FAILURE() << "Failed to setWD: " << Err.message();
-  VFS->addFile(Filename, /*ModificationTime=*/0,
-               llvm::MemoryBuffer::getMemBufferCopy(In.Code, Filename));
-  for (const auto &Extra : In.ExtraFiles)
-    VFS->addFile(
-        Extra.getKey(), /*ModificationTime=*/0,
-        llvm::MemoryBuffer::getMemBufferCopy(Extra.getValue(), Extra.getKey()));
-
   // Extra error conditions are reported through diagnostics, set that up first.
   bool ErrorOK = In.ErrorOK || llvm::StringRef(In.Code).contains("error-ok");
-  Clang->createDiagnostics(*VFS, new StoreDiagnostics(Diagnostics, !ErrorOK));
+  Clang->createDiagnostics(new StoreDiagnostics(Diagnostics, !ErrorOK));
 
   // Parse cc1 argv, (typically [-std=c++20 input.cc]) into CompilerInvocation.
   std::vector<const char *> Argv;
@@ -108,6 +93,9 @@ TestAST::TestAST(const TestInputs &In) {
     Argv.push_back(S.c_str());
   for (const auto &S : In.ExtraArgs)
     Argv.push_back(S.c_str());
+  std::string Filename = In.FileName;
+  if (Filename.empty())
+    Filename = getFilenameForTesting(In.Language).str();
   Argv.push_back(Filename.c_str());
   Clang->setInvocation(std::make_unique<CompilerInvocation>());
   if (!CompilerInvocation::CreateFromArgs(Clang->getInvocation(), Argv,
@@ -117,6 +105,16 @@ TestAST::TestAST(const TestInputs &In) {
   }
   assert(!Clang->getInvocation().getFrontendOpts().DisableFree);
 
+  // Set up a VFS with only the virtual file visible.
+  auto VFS = llvm::makeIntrusiveRefCnt<llvm::vfs::InMemoryFileSystem>();
+  if (auto Err = VFS->setCurrentWorkingDirectory(In.WorkingDir))
+    ADD_FAILURE() << "Failed to setWD: " << Err.message();
+  VFS->addFile(Filename, /*ModificationTime=*/0,
+               llvm::MemoryBuffer::getMemBufferCopy(In.Code, Filename));
+  for (const auto &Extra : In.ExtraFiles)
+    VFS->addFile(
+        Extra.getKey(), /*ModificationTime=*/0,
+        llvm::MemoryBuffer::getMemBufferCopy(Extra.getValue(), Extra.getKey()));
   Clang->createFileManager(VFS);
 
   // Running the FrontendAction creates the other components: SourceManager,

diff  --git a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
index 5a648df05e4fd3..fd1b7af0600da7 100644
--- a/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
+++ b/clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
@@ -322,8 +322,7 @@ class DependencyScanningAction : public tooling::ToolAction {
 
     // Create the compiler's actual diagnostics engine.
     sanitizeDiagOpts(ScanInstance.getDiagnosticOpts());
-    ScanInstance.createDiagnostics(DriverFileMgr->getVirtualFileSystem(),
-                                   DiagConsumer, /*ShouldOwnClient=*/false);
+    ScanInstance.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
     if (!ScanInstance.hasDiagnostics())
       return false;
 
@@ -651,7 +650,7 @@ bool DependencyScanningWorker::computeDependencies(
   auto DiagOpts = CreateAndPopulateDiagOpts(FinalCCommandLine);
   sanitizeDiagOpts(*DiagOpts);
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*FinalFS, DiagOpts.release(), &DC,
+      CompilerInstance::createDiagnostics(DiagOpts.release(), &DC,
                                           /*ShouldOwnClient=*/false);
 
   // Although `Diagnostics` are used only for command-line parsing, the

diff  --git a/clang/lib/Tooling/Tooling.cpp b/clang/lib/Tooling/Tooling.cpp
index 88b7349ce8fed6..ffacf9cf1f7829 100644
--- a/clang/lib/Tooling/Tooling.cpp
+++ b/clang/lib/Tooling/Tooling.cpp
@@ -387,8 +387,7 @@ bool ToolInvocation::run() {
   TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), DiagOpts);
   IntrusiveRefCntPtr<DiagnosticsEngine> Diagnostics =
       CompilerInstance::createDiagnostics(
-          Files->getVirtualFileSystem(), &*DiagOpts,
-          DiagConsumer ? DiagConsumer : &DiagnosticPrinter, false);
+          &*DiagOpts, DiagConsumer ? DiagConsumer : &DiagnosticPrinter, false);
   // Although `Diagnostics` are used only for command-line parsing, the custom
   // `DiagConsumer` might expect a `SourceManager` to be present.
   SourceManager SrcMgr(*Diagnostics, *Files);
@@ -457,8 +456,7 @@ bool FrontendActionFactory::runInvocation(
   std::unique_ptr<FrontendAction> ScopedToolAction(create());
 
   // Create the compiler's actual diagnostics engine.
-  Compiler.createDiagnostics(Files->getVirtualFileSystem(), DiagConsumer,
-                             /*ShouldOwnClient=*/false);
+  Compiler.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
   if (!Compiler.hasDiagnostics())
     return false;
 
@@ -654,8 +652,7 @@ class ASTBuilderAction : public ToolAction {
                      DiagnosticConsumer *DiagConsumer) override {
     std::unique_ptr<ASTUnit> AST = ASTUnit::LoadFromCompilerInvocation(
         Invocation, std::move(PCHContainerOps),
-        CompilerInstance::createDiagnostics(Files->getVirtualFileSystem(),
-                                            &Invocation->getDiagnosticOpts(),
+        CompilerInstance::createDiagnostics(&Invocation->getDiagnosticOpts(),
                                             DiagConsumer,
                                             /*ShouldOwnClient=*/false),
         Files);

diff  --git a/clang/tools/c-index-test/core_main.cpp b/clang/tools/c-index-test/core_main.cpp
index 327a77a09408ba..c43bff21962118 100644
--- a/clang/tools/c-index-test/core_main.cpp
+++ b/clang/tools/c-index-test/core_main.cpp
@@ -25,7 +25,6 @@
 #include "llvm/Support/Program.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/StringSaver.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace clang;
@@ -220,9 +219,8 @@ static bool printSourceSymbols(const char *Executable,
   SmallVector<const char *, 4> ArgsWithProgName;
   ArgsWithProgName.push_back(Executable);
   ArgsWithProgName.append(Args.begin(), Args.end());
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                          new DiagnosticOptions));
+  IntrusiveRefCntPtr<DiagnosticsEngine>
+    Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions));
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
   CIOpts.ProbePrecompiled = true; // FIXME: historical default. Needed?
@@ -275,8 +273,7 @@ static bool printSourceSymbolsFromModule(StringRef modulePath,
   auto HSOpts = std::make_shared<HeaderSearchOptions>();
 
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                          new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
   std::unique_ptr<ASTUnit> AU =
       ASTUnit::LoadFromASTFile(modulePath, *pchRdr, ASTUnit::LoadASTOnly, Diags,
                                FileSystemOpts, HSOpts, /*LangOpts=*/nullptr,

diff  --git a/clang/tools/clang-import-test/clang-import-test.cpp b/clang/tools/clang-import-test/clang-import-test.cpp
index 41a8a63a2e22be..2473e16a546dc0 100644
--- a/clang/tools/clang-import-test/clang-import-test.cpp
+++ b/clang/tools/clang-import-test/clang-import-test.cpp
@@ -31,7 +31,6 @@
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Error.h"
 #include "llvm/Support/Signals.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 
 #include <memory>
@@ -165,8 +164,7 @@ std::unique_ptr<CompilerInstance> BuildCompilerInstance() {
   auto Ins = std::make_unique<CompilerInstance>();
   auto DC = std::make_unique<TestDiagnosticConsumer>();
   const bool ShouldOwnClient = true;
-  Ins->createDiagnostics(*llvm::vfs::getRealFileSystem(), DC.release(),
-                         ShouldOwnClient);
+  Ins->createDiagnostics(DC.release(), ShouldOwnClient);
 
   auto Inv = std::make_unique<CompilerInvocation>();
 

diff  --git a/clang/tools/clang-installapi/ClangInstallAPI.cpp b/clang/tools/clang-installapi/ClangInstallAPI.cpp
index ce6240b1b56f1e..308e5285e32578 100644
--- a/clang/tools/clang-installapi/ClangInstallAPI.cpp
+++ b/clang/tools/clang-installapi/ClangInstallAPI.cpp
@@ -113,7 +113,7 @@ static bool run(ArrayRef<const char *> Args, const char *ProgName) {
   // Set up compilation.
   std::unique_ptr<CompilerInstance> CI(new CompilerInstance());
   CI->setFileManager(FM.get());
-  CI->createDiagnostics(FM->getVirtualFileSystem());
+  CI->createDiagnostics();
   if (!CI->hasDiagnostics())
     return EXIT_FAILURE;
 

diff  --git a/clang/tools/clang-scan-deps/ClangScanDeps.cpp b/clang/tools/clang-scan-deps/ClangScanDeps.cpp
index 58b56dcfd3bece..9b30799c3ab263 100644
--- a/clang/tools/clang-scan-deps/ClangScanDeps.cpp
+++ b/clang/tools/clang-scan-deps/ClangScanDeps.cpp
@@ -29,7 +29,6 @@
 #include "llvm/Support/ThreadPool.h"
 #include "llvm/Support/Threading.h"
 #include "llvm/Support/Timer.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 #include <mutex>
 #include <optional>
@@ -425,8 +424,7 @@ class FullDeps {
     IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions{};
     TextDiagnosticPrinter DiagConsumer(ErrOS, &*DiagOpts);
     IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-        CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                            &*DiagOpts, &DiagConsumer,
+        CompilerInstance::createDiagnostics(&*DiagOpts, &DiagConsumer,
                                             /*ShouldOwnClient=*/false);
 
     for (auto &&M : Modules)
@@ -741,8 +739,7 @@ getCompilationDatabase(int argc, char **argv, std::string &ErrorMessage) {
         tooling::JSONCommandLineSyntax::AutoDetect);
 
   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                          new DiagnosticOptions);
+      CompilerInstance::createDiagnostics(new DiagnosticOptions);
   driver::Driver TheDriver(CommandLine[0], llvm::sys::getDefaultTargetTriple(),
                            *Diags);
   TheDriver.setCheckInputsExist(false);

diff  --git a/clang/tools/diagtool/ShowEnabledWarnings.cpp b/clang/tools/diagtool/ShowEnabledWarnings.cpp
index 48bed7c828c16b..66a295db054c35 100644
--- a/clang/tools/diagtool/ShowEnabledWarnings.cpp
+++ b/clang/tools/diagtool/ShowEnabledWarnings.cpp
@@ -14,7 +14,6 @@
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/Frontend/Utils.h"
 #include "llvm/Support/TargetSelect.h"
-#include "llvm/Support/VirtualFileSystem.h"
 
 DEF_DIAGTOOL("show-enabled",
              "Show which warnings are enabled for a given command line",
@@ -75,8 +74,7 @@ createDiagnostics(unsigned int argc, char **argv) {
 
   // Build the diagnostics parser
   IntrusiveRefCntPtr<DiagnosticsEngine> FinalDiags =
-      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                          &Invocation->getDiagnosticOpts());
+    CompilerInstance::createDiagnostics(&Invocation->getDiagnosticOpts());
   if (!FinalDiags)
     return nullptr;
 

diff  --git a/clang/tools/driver/cc1_main.cpp b/clang/tools/driver/cc1_main.cpp
index d14058ff2c723d..554dc956c7cfe3 100644
--- a/clang/tools/driver/cc1_main.cpp
+++ b/clang/tools/driver/cc1_main.cpp
@@ -45,7 +45,6 @@
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/TimeProfiler.h"
 #include "llvm/Support/Timer.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/TargetParser/AArch64TargetParser.h"
@@ -265,7 +264,7 @@ int cc1_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
       CompilerInvocation::GetResourcesPath(Argv0, MainAddr);
 
   // Create the actual diagnostics engine.
-  Clang->createDiagnostics(*llvm::vfs::getRealFileSystem());
+  Clang->createDiagnostics();
   if (!Clang->hasDiagnostics())
     return 1;
 

diff  --git a/clang/tools/libclang/CIndex.cpp b/clang/tools/libclang/CIndex.cpp
index def4524449355a..cec6f026fccfd8 100644
--- a/clang/tools/libclang/CIndex.cpp
+++ b/clang/tools/libclang/CIndex.cpp
@@ -59,7 +59,6 @@
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/Threading.h"
 #include "llvm/Support/Timer.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Support/thread.h"
 #include <mutex>
@@ -4093,8 +4092,7 @@ enum CXErrorCode clang_createTranslationUnit2(CXIndex CIdx,
   auto HSOpts = std::make_shared<HeaderSearchOptions>();
 
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                          new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
   std::unique_ptr<ASTUnit> AU = ASTUnit::LoadFromASTFile(
       ast_filename, CXXIdx->getPCHContainerOperations()->getRawReader(),
       ASTUnit::LoadEverything, Diags, FileSystemOpts, HSOpts,
@@ -4167,8 +4165,7 @@ clang_parseTranslationUnit_Impl(CXIndex CIdx, const char *source_filename,
   std::unique_ptr<DiagnosticOptions> DiagOpts = CreateAndPopulateDiagOpts(
       llvm::ArrayRef(command_line_args, num_command_line_args));
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                          DiagOpts.release()));
+      CompilerInstance::createDiagnostics(DiagOpts.release()));
 
   if (options & CXTranslationUnit_KeepGoing)
     Diags->setFatalsAsError(true);

diff  --git a/clang/tools/libclang/Indexing.cpp b/clang/tools/libclang/Indexing.cpp
index b890921972a0a7..05d88452209fb3 100644
--- a/clang/tools/libclang/Indexing.cpp
+++ b/clang/tools/libclang/Indexing.cpp
@@ -29,7 +29,6 @@
 #include "clang/Lex/PreprocessorOptions.h"
 #include "llvm/Support/CrashRecoveryContext.h"
 #include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include <cstdio>
 #include <mutex>
 #include <utility>
@@ -480,10 +479,10 @@ static CXErrorCode clang_indexSourceFile_Impl(
     CaptureDiag = new CaptureDiagnosticConsumer();
 
   // Configure the diagnostics.
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                          new DiagnosticOptions, CaptureDiag,
-                                          /*ShouldOwnClient=*/true));
+  IntrusiveRefCntPtr<DiagnosticsEngine>
+    Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions,
+                                              CaptureDiag,
+                                              /*ShouldOwnClient=*/true));
 
   // Recover resources if we crash before exiting this function.
   llvm::CrashRecoveryContextCleanupRegistrar<DiagnosticsEngine,

diff  --git a/clang/unittests/AST/ExternalASTSourceTest.cpp b/clang/unittests/AST/ExternalASTSourceTest.cpp
index 8e1bde1247f660..8b70be664e043c 100644
--- a/clang/unittests/AST/ExternalASTSourceTest.cpp
+++ b/clang/unittests/AST/ExternalASTSourceTest.cpp
@@ -10,14 +10,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "clang/AST/ExternalASTSource.h"
 #include "clang/AST/ASTConsumer.h"
 #include "clang/AST/ASTContext.h"
+#include "clang/AST/ExternalASTSource.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendActions.h"
 #include "clang/Lex/PreprocessorOptions.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace clang;
@@ -47,7 +46,7 @@ class TestFrontendAction : public ASTFrontendAction {
 bool testExternalASTSource(ExternalASTSource *Source,
                            StringRef FileContents) {
   CompilerInstance Compiler;
-  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  Compiler.createDiagnostics();
 
   auto Invocation = std::make_shared<CompilerInvocation>();
   Invocation->getPreprocessorOpts().addRemappedFile(

diff  --git a/clang/unittests/CodeGen/TestCompiler.h b/clang/unittests/CodeGen/TestCompiler.h
index 931c75effbf754..891489cb511a4f 100644
--- a/clang/unittests/CodeGen/TestCompiler.h
+++ b/clang/unittests/CodeGen/TestCompiler.h
@@ -20,7 +20,6 @@
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 
 namespace llvm {
@@ -36,7 +35,7 @@ struct TestCompiler {
                clang::CodeGenOptions CGO = clang::CodeGenOptions()) {
     compiler.getLangOpts() = LO;
     compiler.getCodeGenOpts() = CGO;
-    compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+    compiler.createDiagnostics();
 
     std::string TrStr = llvm::Triple::normalize(llvm::sys::getProcessTriple());
     llvm::Triple Tr(TrStr);

diff  --git a/clang/unittests/Driver/DXCModeTest.cpp b/clang/unittests/Driver/DXCModeTest.cpp
index 616c07c0d389d1..2a079a62f1bc13 100644
--- a/clang/unittests/Driver/DXCModeTest.cpp
+++ b/clang/unittests/Driver/DXCModeTest.cpp
@@ -219,8 +219,7 @@ TEST(DxcModeTest, DefaultEntry) {
   const char *Args[] = {"clang", "--driver-mode=dxc", "-Tcs_6_7", "foo.hlsl"};
 
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*InMemoryFileSystem,
-                                          new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
 
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;

diff  --git a/clang/unittests/Driver/ToolChainTest.cpp b/clang/unittests/Driver/ToolChainTest.cpp
index 0787e7d2d33391..8542a168f93c27 100644
--- a/clang/unittests/Driver/ToolChainTest.cpp
+++ b/clang/unittests/Driver/ToolChainTest.cpp
@@ -577,7 +577,7 @@ TEST(CompilerInvocation, SplitSwarfSingleCrash) {
 
 TEST(ToolChainTest, UEFICallingConventionTest) {
   clang::CompilerInstance compiler;
-  compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  compiler.createDiagnostics();
 
   std::string TrStr = "x86_64-unknown-uefi";
   llvm::Triple Tr(TrStr);

diff  --git a/clang/unittests/Frontend/ASTUnitTest.cpp b/clang/unittests/Frontend/ASTUnitTest.cpp
index e6524a019871dc..bd5d5d00981807 100644
--- a/clang/unittests/Frontend/ASTUnitTest.cpp
+++ b/clang/unittests/Frontend/ASTUnitTest.cpp
@@ -17,7 +17,6 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Path.h"
 #include "llvm/Support/ToolOutputFile.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -42,18 +41,17 @@ class ASTUnitTest : public ::testing::Test {
 
     const char *Args[] = {"clang", "-xc++", InputFileName.c_str()};
 
-    auto VFS = llvm::vfs::getRealFileSystem();
-    Diags = CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions());
+    Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions());
 
     CreateInvocationOptions CIOpts;
     CIOpts.Diags = Diags;
-    CIOpts.VFS = VFS;
     CInvok = createInvocation(Args, std::move(CIOpts));
 
     if (!CInvok)
       return nullptr;
 
-    FileManager *FileMgr = new FileManager(FileSystemOptions(), VFS);
+    FileManager *FileMgr =
+        new FileManager(FileSystemOptions(), vfs::getRealFileSystem());
     PCHContainerOps = std::make_shared<PCHContainerOperations>();
 
     return ASTUnit::LoadFromCompilerInvocation(
@@ -136,8 +134,7 @@ TEST_F(ASTUnitTest, ModuleTextualHeader) {
 
   const char *Args[] = {"clang", "test.cpp", "-fmodule-map-file=m.modulemap",
                         "-fmodule-name=M"};
-  Diags =
-      CompilerInstance::createDiagnostics(*InMemoryFs, new DiagnosticOptions());
+  Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions());
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
   CInvok = createInvocation(Args, std::move(CIOpts));
@@ -165,8 +162,7 @@ TEST_F(ASTUnitTest, LoadFromCommandLineEarlyError) {
 
   const char *Args[] = {"clang", "-target", "foobar", InputFileName.c_str()};
 
-  auto Diags = CompilerInstance::createDiagnostics(
-      *llvm::vfs::getRealFileSystem(), new DiagnosticOptions());
+  auto Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions());
   auto PCHContainerOps = std::make_shared<PCHContainerOperations>();
   std::unique_ptr<clang::ASTUnit> ErrUnit;
 
@@ -193,8 +189,7 @@ TEST_F(ASTUnitTest, LoadFromCommandLineWorkingDirectory) {
   const char *Args[] = {"clang", "-working-directory", WorkingDir.c_str(),
                         InputFileName.c_str()};
 
-  auto Diags = CompilerInstance::createDiagnostics(
-      *llvm::vfs::getRealFileSystem(), new DiagnosticOptions());
+  auto Diags = CompilerInstance::createDiagnostics(new DiagnosticOptions());
   auto PCHContainerOps = std::make_shared<PCHContainerOperations>();
   std::unique_ptr<clang::ASTUnit> ErrUnit;
 

diff  --git a/clang/unittests/Frontend/CodeGenActionTest.cpp b/clang/unittests/Frontend/CodeGenActionTest.cpp
index d855302ed05429..a6520910c83996 100644
--- a/clang/unittests/Frontend/CodeGenActionTest.cpp
+++ b/clang/unittests/Frontend/CodeGenActionTest.cpp
@@ -16,7 +16,6 @@
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "llvm/Support/FormatVariadic.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -53,7 +52,7 @@ TEST(CodeGenTest, TestNullCodeGen) {
   Invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance Compiler;
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  Compiler.createDiagnostics();
   EXPECT_TRUE(Compiler.hasDiagnostics());
 
   std::unique_ptr<FrontendAction> Act(new NullCodeGenAction);
@@ -71,7 +70,7 @@ TEST(CodeGenTest, CodeGenFromIRMemBuffer) {
   Invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance Compiler;
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  Compiler.createDiagnostics();
   EXPECT_TRUE(Compiler.hasDiagnostics());
 
   EmitLLVMOnlyAction Action;
@@ -102,7 +101,7 @@ TEST(CodeGenTest, DebugInfoCWDCodeGen) {
   SmallString<256> IRBuffer;
   Compiler.setOutputStream(std::make_unique<raw_svector_ostream>(IRBuffer));
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics(*VFS);
+  Compiler.createDiagnostics();
   Compiler.createFileManager(std::move(VFS));
 
   EmitLLVMAction Action;

diff  --git a/clang/unittests/Frontend/CompilerInstanceTest.cpp b/clang/unittests/Frontend/CompilerInstanceTest.cpp
index 07329eb299e293..5cf548e913cc10 100644
--- a/clang/unittests/Frontend/CompilerInstanceTest.cpp
+++ b/clang/unittests/Frontend/CompilerInstanceTest.cpp
@@ -13,7 +13,6 @@
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/ToolOutputFile.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -54,8 +53,7 @@ TEST(CompilerInstance, DefaultVFSOverlayFromInvocation) {
   const char *Args[] = {"clang", VFSArg.c_str(), "-xc++", "-"};
 
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*llvm::vfs::getRealFileSystem(),
-                                          new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
 
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
@@ -89,9 +87,8 @@ TEST(CompilerInstance, AllowDiagnosticLogWithUnownedDiagnosticConsumer) {
   auto DiagPrinter = std::make_unique<TextDiagnosticPrinter>(
       DiagnosticsOS, new DiagnosticOptions());
   CompilerInstance Instance;
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      Instance.createDiagnostics(*llvm::vfs::getRealFileSystem(), DiagOpts,
-                                 DiagPrinter.get(), /*ShouldOwnClient=*/false);
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags = Instance.createDiagnostics(
+      DiagOpts, DiagPrinter.get(), /*ShouldOwnClient=*/false);
 
   Diags->Report(diag::err_expected) << "no crash";
   ASSERT_EQ(DiagnosticOutput, "error: expected no crash\n");

diff  --git a/clang/unittests/Frontend/CompilerInvocationTest.cpp b/clang/unittests/Frontend/CompilerInvocationTest.cpp
index 4ff6824f1e21e3..45478de5e6f7c8 100644
--- a/clang/unittests/Frontend/CompilerInvocationTest.cpp
+++ b/clang/unittests/Frontend/CompilerInvocationTest.cpp
@@ -12,7 +12,6 @@
 #include "clang/Frontend/TextDiagnosticBuffer.h"
 #include "clang/Lex/PreprocessorOptions.h"
 #include "clang/Serialization/ModuleFileExtension.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Host.h"
 
 #include "gmock/gmock.h"
@@ -39,9 +38,9 @@ class CommandLineTest : public ::testing::Test {
   }
 
   CommandLineTest()
-      : Diags(CompilerInstance::createDiagnostics(
-            *llvm::vfs::getRealFileSystem(), new DiagnosticOptions(),
-            new TextDiagnosticBuffer())) {}
+      : Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions(),
+                                                  new TextDiagnosticBuffer())) {
+  }
 };
 
 template <typename M>

diff  --git a/clang/unittests/Frontend/FrontendActionTest.cpp b/clang/unittests/Frontend/FrontendActionTest.cpp
index 75e166767c6678..6ce9ba6f6a0888 100644
--- a/clang/unittests/Frontend/FrontendActionTest.cpp
+++ b/clang/unittests/Frontend/FrontendActionTest.cpp
@@ -20,7 +20,6 @@
 #include "clang/Serialization/InMemoryModuleCache.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/ToolOutputFile.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "llvm/TargetParser/Triple.h"
 #include "gtest/gtest.h"
 
@@ -91,7 +90,7 @@ TEST(ASTFrontendAction, Sanity) {
   invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance compiler;
   compiler.setInvocation(std::move(invocation));
-  compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  compiler.createDiagnostics();
 
   TestASTFrontendAction test_action;
   ASSERT_TRUE(compiler.ExecuteAction(test_action));
@@ -111,7 +110,7 @@ TEST(ASTFrontendAction, IncrementalParsing) {
   invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance compiler;
   compiler.setInvocation(std::move(invocation));
-  compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  compiler.createDiagnostics();
 
   TestASTFrontendAction test_action(/*enableIncrementalProcessing=*/true);
   ASSERT_TRUE(compiler.ExecuteAction(test_action));
@@ -138,7 +137,7 @@ TEST(ASTFrontendAction, LateTemplateIncrementalParsing) {
   invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance compiler;
   compiler.setInvocation(std::move(invocation));
-  compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  compiler.createDiagnostics();
 
   TestASTFrontendAction test_action(/*enableIncrementalProcessing=*/true,
                                     /*actOnEndOfTranslationUnit=*/true);
@@ -184,7 +183,7 @@ TEST(PreprocessorFrontendAction, EndSourceFile) {
   Invocation->getTargetOpts().Triple = "i386-unknown-linux-gnu";
   CompilerInstance Compiler;
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  Compiler.createDiagnostics();
 
   TestPPCallbacks *Callbacks = new TestPPCallbacks;
   TestPPCallbacksFrontendAction TestAction(Callbacks);
@@ -246,8 +245,7 @@ TEST(ASTFrontendAction, ExternalSemaSource) {
   CompilerInstance Compiler;
   Compiler.setInvocation(std::move(Invocation));
   auto *TDC = new TypoDiagnosticConsumer;
-  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem(), TDC,
-                             /*ShouldOwnClient=*/true);
+  Compiler.createDiagnostics(TDC, /*ShouldOwnClient=*/true);
   Compiler.setExternalSemaSource(new TypoExternalSemaSource(Compiler));
 
   SyntaxOnlyAction TestAction;
@@ -279,7 +277,7 @@ TEST(GeneratePCHFrontendAction, CacheGeneratedPCH) {
     Invocation->getTargetOpts().Triple = "x86_64-apple-darwin19.0.0";
     CompilerInstance Compiler;
     Compiler.setInvocation(std::move(Invocation));
-    Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+    Compiler.createDiagnostics();
 
     GeneratePCHAction TestAction;
     ASSERT_TRUE(Compiler.ExecuteAction(TestAction));

diff  --git a/clang/unittests/Frontend/OutputStreamTest.cpp b/clang/unittests/Frontend/OutputStreamTest.cpp
index fa5d726d252903..2618558c7e11ee 100644
--- a/clang/unittests/Frontend/OutputStreamTest.cpp
+++ b/clang/unittests/Frontend/OutputStreamTest.cpp
@@ -13,7 +13,6 @@
 #include "clang/Frontend/TextDiagnosticPrinter.h"
 #include "clang/FrontendTool/Utils.h"
 #include "clang/Lex/PreprocessorOptions.h"
-#include "llvm/Support/VirtualFileSystem.h"
 #include "gtest/gtest.h"
 
 using namespace llvm;
@@ -38,7 +37,7 @@ TEST(FrontendOutputTests, TestOutputStream) {
 
   Compiler.setOutputStream(std::move(IRStream));
   Compiler.setInvocation(std::move(Invocation));
-  Compiler.createDiagnostics(*llvm::vfs::getRealFileSystem());
+  Compiler.createDiagnostics();
 
   bool Success = ExecuteCompilerInvocation(&Compiler);
   EXPECT_TRUE(Success);
@@ -63,7 +62,6 @@ TEST(FrontendOutputTests, TestVerboseOutputStreamShared) {
   Compiler.setInvocation(std::move(Invocation));
   IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
   Compiler.createDiagnostics(
-      *llvm::vfs::getRealFileSystem(),
       new TextDiagnosticPrinter(llvm::nulls(), &*DiagOpts), true);
   Compiler.setVerboseOutputStream(VerboseStream);
 
@@ -93,7 +91,6 @@ TEST(FrontendOutputTests, TestVerboseOutputStreamOwned) {
     Compiler.setInvocation(std::move(Invocation));
     IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
     Compiler.createDiagnostics(
-        *llvm::vfs::getRealFileSystem(),
         new TextDiagnosticPrinter(llvm::nulls(), &*DiagOpts), true);
     Compiler.setVerboseOutputStream(std::move(VerboseStream));
 

diff  --git a/clang/unittests/Frontend/PCHPreambleTest.cpp b/clang/unittests/Frontend/PCHPreambleTest.cpp
index 58ec2e2ce70589..2ce24c91ac0f13 100644
--- a/clang/unittests/Frontend/PCHPreambleTest.cpp
+++ b/clang/unittests/Frontend/PCHPreambleTest.cpp
@@ -94,9 +94,8 @@ class PCHPreambleTest : public ::testing::Test {
     PreprocessorOptions &PPOpts = CI->getPreprocessorOpts();
     PPOpts.RemappedFilesKeepOriginalName = true;
 
-    IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-        CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions,
-                                            new DiagnosticConsumer));
+    IntrusiveRefCntPtr<DiagnosticsEngine>
+      Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions, new DiagnosticConsumer));
 
     FileManager *FileMgr = new FileManager(FSOpts, VFS);
 

diff  --git a/clang/unittests/Frontend/ReparseWorkingDirTest.cpp b/clang/unittests/Frontend/ReparseWorkingDirTest.cpp
index b0f2d51b80b9e7..ca7ce23dd64b22 100644
--- a/clang/unittests/Frontend/ReparseWorkingDirTest.cpp
+++ b/clang/unittests/Frontend/ReparseWorkingDirTest.cpp
@@ -58,7 +58,7 @@ class ReparseWorkingDirTest : public ::testing::Test {
     CI->getTargetOpts().Triple = "i386-unknown-linux-gnu";
 
     IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
-        CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions,
+        CompilerInstance::createDiagnostics(new DiagnosticOptions,
                                             new DiagnosticConsumer));
 
     FileManager *FileMgr = new FileManager(CI->getFileSystemOpts(), VFS);

diff  --git a/clang/unittests/Frontend/UtilsTest.cpp b/clang/unittests/Frontend/UtilsTest.cpp
index 304fbe2a8e69f0..ae014d3f86b5aa 100644
--- a/clang/unittests/Frontend/UtilsTest.cpp
+++ b/clang/unittests/Frontend/UtilsTest.cpp
@@ -28,9 +28,9 @@ TEST(BuildCompilerInvocationTest, RecoverMultipleJobs) {
   clang::IgnoringDiagConsumer D;
   CreateInvocationOptions Opts;
   Opts.RecoverOnError = true;
+  Opts.Diags = clang::CompilerInstance::createDiagnostics(new DiagnosticOptions,
+                                                          &D, false);
   Opts.VFS = new llvm::vfs::InMemoryFileSystem();
-  Opts.Diags = clang::CompilerInstance::createDiagnostics(
-      *Opts.VFS, new DiagnosticOptions, &D, false);
   std::unique_ptr<CompilerInvocation> CI = createInvocation(Args, Opts);
   ASSERT_TRUE(CI);
   EXPECT_THAT(CI->TargetOpts->Triple, testing::StartsWith("i386-"));
@@ -46,7 +46,7 @@ TEST(BuildCompilerInvocationTest, ProbePrecompiled) {
 
   clang::IgnoringDiagConsumer D;
   llvm::IntrusiveRefCntPtr<DiagnosticsEngine> CommandLineDiagsEngine =
-      clang::CompilerInstance::createDiagnostics(*FS, new DiagnosticOptions, &D,
+      clang::CompilerInstance::createDiagnostics(new DiagnosticOptions, &D,
                                                  false);
   // Default: ProbePrecompiled=false
   CreateInvocationOptions CIOpts;

diff  --git a/clang/unittests/Sema/SemaNoloadLookupTest.cpp b/clang/unittests/Sema/SemaNoloadLookupTest.cpp
index a8e1bb0bd2c5de..cf89c7331e4e0f 100644
--- a/clang/unittests/Sema/SemaNoloadLookupTest.cpp
+++ b/clang/unittests/Sema/SemaNoloadLookupTest.cpp
@@ -57,12 +57,11 @@ class NoloadLookupTest : public ::testing::Test {
     std::string FileName = llvm::Twine(ModuleName + ".cppm").str();
     addFile(FileName, Contents);
 
-    CreateInvocationOptions CIOpts;
-    CIOpts.VFS = llvm::vfs::getRealFileSystem();
     IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-        CompilerInstance::createDiagnostics(*CIOpts.VFS,
-                                            new DiagnosticOptions());
+        CompilerInstance::createDiagnostics(new DiagnosticOptions());
+    CreateInvocationOptions CIOpts;
     CIOpts.Diags = Diags;
+    CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
     std::string CacheBMIPath =
         llvm::Twine(TestDir + "/" + ModuleName + ".pcm").str();

diff  --git a/clang/unittests/Serialization/ForceCheckFileInputTest.cpp b/clang/unittests/Serialization/ForceCheckFileInputTest.cpp
index 6a839d1bf9350b..ad8892b8c8be1e 100644
--- a/clang/unittests/Serialization/ForceCheckFileInputTest.cpp
+++ b/clang/unittests/Serialization/ForceCheckFileInputTest.cpp
@@ -63,13 +63,11 @@ export int aa = 43;
   std::string BMIPath = llvm::Twine(TestDir + "/a.pcm").str();
 
   {
-    CreateInvocationOptions CIOpts;
-    CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
-
     IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-        CompilerInstance::createDiagnostics(*CIOpts.VFS,
-                                            new DiagnosticOptions());
+        CompilerInstance::createDiagnostics(new DiagnosticOptions());
+    CreateInvocationOptions CIOpts;
     CIOpts.Diags = Diags;
+    CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
     const char *Args[] = {"clang++",       "-std=c++20",
                           "--precompile",  "-working-directory",
@@ -105,12 +103,11 @@ export int aa = 43;
   }
 
   {
-    CreateInvocationOptions CIOpts;
-    CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
     IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-        CompilerInstance::createDiagnostics(*CIOpts.VFS,
-                                            new DiagnosticOptions());
+        CompilerInstance::createDiagnostics(new DiagnosticOptions());
+    CreateInvocationOptions CIOpts;
     CIOpts.Diags = Diags;
+    CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
     std::string BMIPath = llvm::Twine(TestDir + "/a.pcm").str();
     const char *Args[] = {

diff  --git a/clang/unittests/Serialization/ModuleCacheTest.cpp b/clang/unittests/Serialization/ModuleCacheTest.cpp
index 6ceee1c6536cb5..a7ca98549b4125 100644
--- a/clang/unittests/Serialization/ModuleCacheTest.cpp
+++ b/clang/unittests/Serialization/ModuleCacheTest.cpp
@@ -106,11 +106,11 @@ TEST_F(ModuleCacheTest, CachedModuleNewPath) {
 
   SmallString<256> MCPArg("-fmodules-cache-path=");
   MCPArg.append(ModuleCachePath);
-  CreateInvocationOptions CIOpts;
-  CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*CIOpts.VFS, new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
+  CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
+  CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
   // First run should pass with no errors
   const char *Args[] = {"clang",        "-fmodules",          "-Fframeworks",
@@ -156,11 +156,11 @@ TEST_F(ModuleCacheTest, CachedModuleNewPathAllowErrors) {
 
   SmallString<256> MCPArg("-fmodules-cache-path=");
   MCPArg.append(ModuleCachePath);
-  CreateInvocationOptions CIOpts;
-  CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*CIOpts.VFS, new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
+  CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
+  CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
   // First run should pass with no errors
   const char *Args[] = {"clang",        "-fmodules",          "-Fframeworks",

diff  --git a/clang/unittests/Serialization/NoCommentsTest.cpp b/clang/unittests/Serialization/NoCommentsTest.cpp
index a1fb23404e4154..a0a564aeff9a15 100644
--- a/clang/unittests/Serialization/NoCommentsTest.cpp
+++ b/clang/unittests/Serialization/NoCommentsTest.cpp
@@ -83,11 +83,11 @@ export module Comments;
 void foo() {}
   )cpp");
 
-  CreateInvocationOptions CIOpts;
-  CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*CIOpts.VFS, new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
+  CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
+  CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
   std::string CacheBMIPath = llvm::Twine(TestDir + "/Comments.pcm").str();
   const char *Args[] = {"clang++",       "-std=c++20",

diff  --git a/clang/unittests/Serialization/PreambleInNamedModulesTest.cpp b/clang/unittests/Serialization/PreambleInNamedModulesTest.cpp
index cf317eddb0f373..d26e1cb633654f 100644
--- a/clang/unittests/Serialization/PreambleInNamedModulesTest.cpp
+++ b/clang/unittests/Serialization/PreambleInNamedModulesTest.cpp
@@ -75,10 +75,10 @@ export using ::E;
   )cpp",
           MainFilePath);
 
+  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
   IntrusiveRefCntPtr<llvm::vfs::FileSystem> VFS =
       llvm::vfs::createPhysicalFileSystem();
-  IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*VFS, new DiagnosticOptions());
 
   CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;

diff  --git a/clang/unittests/Serialization/VarDeclConstantInitTest.cpp b/clang/unittests/Serialization/VarDeclConstantInitTest.cpp
index 14c0c30add2078..5cbbfb9ff003b3 100644
--- a/clang/unittests/Serialization/VarDeclConstantInitTest.cpp
+++ b/clang/unittests/Serialization/VarDeclConstantInitTest.cpp
@@ -90,11 +90,11 @@ export namespace Fibonacci
 }
   )cpp");
 
-  CreateInvocationOptions CIOpts;
-  CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
   IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
-      CompilerInstance::createDiagnostics(*CIOpts.VFS, new DiagnosticOptions());
+      CompilerInstance::createDiagnostics(new DiagnosticOptions());
+  CreateInvocationOptions CIOpts;
   CIOpts.Diags = Diags;
+  CIOpts.VFS = llvm::vfs::createPhysicalFileSystem();
 
   const char *Args[] = {"clang++",       "-std=c++20",
                         "--precompile",  "-working-directory",

diff  --git a/clang/unittests/Support/TimeProfilerTest.cpp b/clang/unittests/Support/TimeProfilerTest.cpp
index 995ebf625b7ab2..339b470153e64e 100644
--- a/clang/unittests/Support/TimeProfilerTest.cpp
+++ b/clang/unittests/Support/TimeProfilerTest.cpp
@@ -45,6 +45,8 @@ std::string teardownProfiler() {
 // We only parse AST here. This is enough for constexpr evaluation.
 bool compileFromString(StringRef Code, StringRef Standard, StringRef File,
                        llvm::StringMap<std::string> Headers = {}) {
+  CompilerInstance Compiler;
+  Compiler.createDiagnostics();
 
   llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> FS(
       new llvm::vfs::InMemoryFileSystem());
@@ -55,8 +57,6 @@ bool compileFromString(StringRef Code, StringRef Standard, StringRef File,
   }
   llvm::IntrusiveRefCntPtr<FileManager> Files(
       new FileManager(FileSystemOptions(), FS));
-  CompilerInstance Compiler;
-  Compiler.createDiagnostics(Files->getVirtualFileSystem());
   Compiler.setFileManager(Files.get());
 
   auto Invocation = std::make_shared<CompilerInvocation>();

diff  --git a/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp b/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
index e1c47708059920..ec0e143be4a209 100644
--- a/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
+++ b/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
@@ -60,8 +60,7 @@ class TestDependencyScanningAction : public tooling::ToolAction {
     Compiler.setInvocation(std::move(Invocation));
     Compiler.setFileManager(FileMgr);
 
-    Compiler.createDiagnostics(FileMgr->getVirtualFileSystem(), DiagConsumer,
-                               /*ShouldOwnClient=*/false);
+    Compiler.createDiagnostics(DiagConsumer, /*ShouldOwnClient=*/false);
     if (!Compiler.hasDiagnostics())
       return false;
 

diff  --git a/clang/unittests/Tooling/ToolingTest.cpp b/clang/unittests/Tooling/ToolingTest.cpp
index 0b65577a05193f..f41a44fa0922a1 100644
--- a/clang/unittests/Tooling/ToolingTest.cpp
+++ b/clang/unittests/Tooling/ToolingTest.cpp
@@ -384,8 +384,7 @@ struct CommandLineExtractorTest : public ::testing::Test {
 public:
   CommandLineExtractorTest()
       : InMemoryFS(new llvm::vfs::InMemoryFileSystem),
-        Diags(CompilerInstance::createDiagnostics(*InMemoryFS,
-                                                  new DiagnosticOptions)),
+        Diags(CompilerInstance::createDiagnostics(new DiagnosticOptions)),
         Driver("clang", llvm::sys::getDefaultTargetTriple(), *Diags,
                "clang LLVM compiler", overlayRealFS(InMemoryFS)) {}
 


        


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