benlangmuir created this revision.
benlangmuir added reviewers: jansvoboda11, Bigcheese.
Herald added a project: All.
benlangmuir requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Instead of trying to "fix" the original driver invocation by appending 
arguments to it, split it into multiple commands, and for each -cc1 command use 
a CompilerInvocation to give precise control over the invocation.

This change should make it easier to (in the future) canonicalize the 
command-line (e.g. to improve hits in something like ccache), apply 
optimizations, or start supporting multi-arch builds, which would require 
different modules for each arch.

In the long run it may make sense to treat the TU commands as a dependency 
graph, each with their own dependencies on modules or earlier TU commands, but 
for now they are simply a list that is executed in order, and the dependencies 
are simply duplicated. Since we currently only support single-arch builds, 
there is no parallelism available in the execution.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D132405

Files:
  clang/include/clang/Tooling/DependencyScanning/DependencyScanningTool.h
  clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h
  clang/include/clang/Tooling/Tooling.h
  clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp
  clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
  clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
  clang/lib/Tooling/Tooling.cpp
  clang/test/ClangScanDeps/deprecated-driver-api.c
  clang/test/ClangScanDeps/diagnostics.c
  clang/test/ClangScanDeps/header-search-pruning-transitive.c
  clang/test/ClangScanDeps/modules-context-hash-ignore-macros.c
  clang/test/ClangScanDeps/modules-context-hash-outputs.c
  clang/test/ClangScanDeps/modules-context-hash-warnings.c
  clang/test/ClangScanDeps/modules-context-hash.c
  clang/test/ClangScanDeps/modules-fmodule-name-no-module-built.m
  clang/test/ClangScanDeps/modules-full.cpp
  clang/test/ClangScanDeps/modules-inferred.m
  clang/test/ClangScanDeps/modules-no-undeclared-includes.c
  clang/test/ClangScanDeps/modules-pch-common-submodule.c
  clang/test/ClangScanDeps/modules-pch-common-via-submodule.c
  clang/test/ClangScanDeps/modules-pch.c
  clang/test/ClangScanDeps/multiple-commands.c
  clang/test/ClangScanDeps/removed-args.c
  clang/tools/clang-scan-deps/ClangScanDeps.cpp
  clang/unittests/Tooling/ToolingTest.cpp
  clang/utils/module-deps-to-rsp.py

Index: clang/utils/module-deps-to-rsp.py
===================================================================
--- clang/utils/module-deps-to-rsp.py
+++ clang/utils/module-deps-to-rsp.py
@@ -48,6 +48,9 @@
                       type=str)
   action.add_argument("--tu-index", help="The index of the translation unit to get arguments for",
                       type=int)
+  parser.add_argument("--tu-cmd-index",
+                      help="The index of the command within the translation unit (default=0)",
+                      type=int, default=0)
   args = parser.parse_args()
 
   full_deps = parseFullDeps(json.load(open(args.full_deps_file, 'r')))
@@ -58,7 +61,8 @@
     if args.module_name:
       cmd = findModule(args.module_name, full_deps)['command-line']
     elif args.tu_index != None:
-      cmd = full_deps.translation_units[args.tu_index]['command-line']
+      tu = full_deps.translation_units[args.tu_index]
+      cmd = tu['commands'][args.tu_cmd_index]['command-line']
 
     print(" ".join(map(quote, cmd)))
   except:
Index: clang/unittests/Tooling/ToolingTest.cpp
===================================================================
--- clang/unittests/Tooling/ToolingTest.cpp
+++ clang/unittests/Tooling/ToolingTest.cpp
@@ -326,6 +326,46 @@
   EXPECT_TRUE(Consumer.SawSourceManager);
 }
 
+TEST(ToolInvocation, CC1Args) {
+  llvm::IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayFileSystem(
+      new llvm::vfs::OverlayFileSystem(llvm::vfs::getRealFileSystem()));
+  llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
+      new llvm::vfs::InMemoryFileSystem);
+  OverlayFileSystem->pushOverlay(InMemoryFileSystem);
+  llvm::IntrusiveRefCntPtr<FileManager> Files(
+      new FileManager(FileSystemOptions(), OverlayFileSystem));
+  std::vector<std::string> Args;
+  Args.push_back("tool-executable");
+  Args.push_back("-cc1");
+  Args.push_back("-fsyntax-only");
+  Args.push_back("test.cpp");
+  clang::tooling::ToolInvocation Invocation(
+      Args, std::make_unique<SyntaxOnlyAction>(), Files.get());
+  InMemoryFileSystem->addFile(
+      "test.cpp", 0, llvm::MemoryBuffer::getMemBuffer("void foo(void);\n"));
+  EXPECT_TRUE(Invocation.run());
+}
+
+TEST(ToolInvocation, CC1ArgsInvalid) {
+  llvm::IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem> OverlayFileSystem(
+      new llvm::vfs::OverlayFileSystem(llvm::vfs::getRealFileSystem()));
+  llvm::IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> InMemoryFileSystem(
+      new llvm::vfs::InMemoryFileSystem);
+  OverlayFileSystem->pushOverlay(InMemoryFileSystem);
+  llvm::IntrusiveRefCntPtr<FileManager> Files(
+      new FileManager(FileSystemOptions(), OverlayFileSystem));
+  std::vector<std::string> Args;
+  Args.push_back("tool-executable");
+  Args.push_back("-cc1");
+  Args.push_back("-invalid-arg");
+  Args.push_back("test.cpp");
+  clang::tooling::ToolInvocation Invocation(
+      Args, std::make_unique<SyntaxOnlyAction>(), Files.get());
+  InMemoryFileSystem->addFile(
+      "test.cpp", 0, llvm::MemoryBuffer::getMemBuffer("void foo(void);\n"));
+  EXPECT_FALSE(Invocation.run());
+}
+
 namespace {
 /// Overlays the real filesystem with the given VFS and returns the result.
 llvm::IntrusiveRefCntPtr<llvm::vfs::OverlayFileSystem>
Index: clang/tools/clang-scan-deps/ClangScanDeps.cpp
===================================================================
--- clang/tools/clang-scan-deps/ClangScanDeps.cpp
+++ clang/tools/clang-scan-deps/ClangScanDeps.cpp
@@ -177,6 +177,11 @@
     llvm::cl::desc("The names of dependency targets for the dependency file"),
     llvm::cl::cat(DependencyScannerCategory));
 
+llvm::cl::opt<bool> DeprecatedDriverCommand(
+    "deprecated-driver-command", llvm::cl::Optional,
+    llvm::cl::desc("use a single driver command to build the tu (deprecated)"),
+    llvm::cl::cat(DependencyScannerCategory));
+
 enum ResourceDirRecipeKind {
   RDRK_ModifyCompilerPath,
   RDRK_InvokeCompiler,
@@ -251,7 +256,7 @@
 public:
   void mergeDeps(StringRef Input, FullDependenciesResult FDR,
                  size_t InputIndex) {
-    const FullDependencies &FD = FDR.FullDeps;
+    FullDependencies &FD = FDR.FullDeps;
 
     InputDeps ID;
     ID.FileName = std::string(Input);
@@ -269,7 +274,8 @@
       Modules.insert(I, {{MD.ID, InputIndex}, std::move(MD)});
     }
 
-    ID.CommandLine = FD.CommandLine;
+    ID.DriverCommandLine = std::move(FD.DriverCommandLine);
+    ID.Commands = std::move(FD.Commands);
     Inputs.push_back(std::move(ID));
   }
 
@@ -306,14 +312,31 @@
 
     Array TUs;
     for (auto &&I : Inputs) {
-      Object O{
-          {"input-file", I.FileName},
-          {"clang-context-hash", I.ContextHash},
-          {"file-deps", I.FileDeps},
-          {"clang-module-deps", toJSONSorted(I.ModuleDeps)},
-          {"command-line", I.CommandLine},
-      };
-      TUs.push_back(std::move(O));
+      Array Commands;
+      if (I.DriverCommandLine.empty()) {
+        for (const auto &Cmd : I.Commands) {
+          Commands.push_back(Object{
+              {"input-file", I.FileName},
+              {"clang-context-hash", I.ContextHash},
+              {"file-deps", I.FileDeps},
+              {"clang-module-deps", toJSONSorted(I.ModuleDeps)},
+              {"executable", Cmd->getExecutable()},
+              {"command-line", Cmd->getArguments()},
+          });
+        }
+      } else {
+        Commands.push_back(Object{
+            {"input-file", I.FileName},
+            {"clang-context-hash", I.ContextHash},
+            {"file-deps", I.FileDeps},
+            {"clang-module-deps", toJSONSorted(I.ModuleDeps)},
+            {"executable", "clang"},
+            {"command-line", I.DriverCommandLine},
+        });
+      }
+      TUs.push_back(Object{
+          {"commands", std::move(Commands)},
+      });
     }
 
     Object Output{
@@ -348,7 +371,8 @@
     std::string ContextHash;
     std::vector<std::string> FileDeps;
     std::vector<ModuleID> ModuleDeps;
-    std::vector<std::string> CommandLine;
+    std::vector<std::string> DriverCommandLine;
+    std::vector<std::unique_ptr<Command>> Commands;
   };
 
   std::mutex Lock;
@@ -554,6 +578,14 @@
           if (handleMakeDependencyToolResult(Filename, MaybeFile, DependencyOS,
                                              Errs))
             HadErrors = true;
+        } else if (DeprecatedDriverCommand) {
+          auto MaybeFullDeps =
+              WorkerTools[I]->getFullDependenciesLegacyDriverCommand(
+                  Input->CommandLine, CWD, AlreadySeenModules, LookupOutput,
+                  MaybeModuleName);
+          if (handleFullDependencyToolResult(Filename, MaybeFullDeps, FD,
+                                             LocalIndex, DependencyOS, Errs))
+            HadErrors = true;
         } else {
           auto MaybeFullDeps = WorkerTools[I]->getFullDependencies(
               Input->CommandLine, CWD, AlreadySeenModules, LookupOutput,
Index: clang/test/ClangScanDeps/removed-args.c
===================================================================
--- clang/test/ClangScanDeps/removed-args.c
+++ clang/test/ClangScanDeps/removed-args.c
@@ -61,7 +61,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "[[HASH_TU:.*]]",
+// CHECK:            "clang-context-hash": "[[HASH_TU:.*]]",
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH_MOD_HEADER]]",
@@ -73,13 +73,12 @@
 // CHECK-NEXT:         }
 // CHECK-NEXT:       ]
 // CHECK-NEXT:       "command-line": [
-// CHECK-NEXT:         "-fsyntax-only",
+// CHECK-NEXT:         "-cc1",
 // CHECK-NOT:          "-fmodules-cache-path=
 // CHECK-NOT:          "-fmodules-validate-once-per-build-session"
+// CHECK-NOT:          "-fbuild-session-timestamp=
 // CHECK-NOT:          "-fbuild-session-file=
 // CHECK-NOT:          "-fmodules-prune-interval=
 // CHECK-NOT:          "-fmodules-prune-after=
 // CHECK:            ],
-// CHECK:          }
-// CHECK-NEXT:   ]
-// CHECK-NEXT: }
+
Index: clang/test/ClangScanDeps/multiple-commands.c
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/multiple-commands.c
@@ -0,0 +1,206 @@
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+// RUN: sed -e "s|DIR|%/t|g" %t/cdb.json.in > %t/cdb.json
+
+// RUN: clang-scan-deps -compilation-database %t/cdb.json -module-files-dir %t/modules \
+// RUN:   -j 1 -format experimental-full -mode preprocess-dependency-directives \
+// RUN:   > %t/deps.json
+
+// RUN: cat %t/deps.json | sed 's:\\\\\?:/:g' | FileCheck %s -DPREFIX=%/t
+
+// Build the -save-temps + -fmodules case
+// RUN: %deps-to-rsp %t/deps.json --module-name=Mod > %t/Mod.rsp
+// RUN: %deps-to-rsp %t/deps.json --tu-index 2 --tu-cmd-index 0 > %t/tu-cpp.rsp
+// RUN: %deps-to-rsp %t/deps.json --tu-index 2 --tu-cmd-index 1 > %t/tu-emit-ir.rsp
+// RUN: %deps-to-rsp %t/deps.json --tu-index 2 --tu-cmd-index 2 > %t/tu-emit-asm.rsp
+// RUN: %deps-to-rsp %t/deps.json --tu-index 2 --tu-cmd-index 3 > %t/tu-cc1as.rsp
+// RUN: %clang @%t/Mod.rsp
+// RUN: %clang @%t/tu-cpp.rsp
+// RUN: ls %t/tu_save_temps_module.i
+// RUN: %clang @%t/tu-emit-ir.rsp
+// RUN: ls %t/tu_save_temps_module.bc
+// RUN: %clang @%t/tu-emit-asm.rsp
+// RUN: ls %t/tu_save_temps_module.s
+// RUN: %clang @%t/tu-cc1as.rsp
+// RUN: ls %t/tu_save_temps_module.o
+
+
+// CHECK:      "modules": [
+// CHECK-NEXT:   {
+// CHECK:          "clang-modulemap-file": "[[PREFIX]]{{.}}module.modulemap"
+// CHECK:          "name": "Mod"
+// CHECK:        }
+// CHECK-NEXT: ]
+// CHECK-NEXT: "translation-units": [
+// CHECK-NEXT:   {
+// CHECK:          "commands": [
+// CHECK-NEXT:       {
+// CHECK-NEXT:         "clang-context-hash":
+// CHECK-NEXT:         "clang-module-deps": []
+// CHECK-NEXT:         "command-line": [
+// CHECK-NEXT:           "-cc1"
+// CHECK:                "-o"
+// CHECK-NEXT:           "{{.*}}tu_no_integrated_as{{.*}}.s"
+// CHECK:                "-S"
+// CHECK:                "{{.*}}tu_no_integrated_as.c"
+// CHECK:              ]
+// CHECK-NEXT:         "executable": "clang"
+// CHECK:              "input-file": "[[PREFIX]]{{.}}tu_no_integrated_as.c"
+// CHECK-NEXT:       }
+// CHECK-NEXT:       {
+// CHECK-NEXT:         "clang-context-hash":
+// CHECK-NEXT:         "clang-module-deps": []
+// CHECK-NEXT:         "command-line": [
+// CHECK:                "-o"
+// CHECK-NEXT:           "{{.*}}tu_no_integrated_as.o"
+// CHECK:                "{{.*}}tu_no_integrated_as{{.*}}.s"
+// CHECK:              ]
+// CHECK-NEXT:         "executable": "/usr/bin/as"
+// CHECK:              "input-file": "[[PREFIX]]{{.}}tu_no_integrated_as.c"
+// CHECK-NEXT:       }
+// CHECK-NEXT:     ]
+// CHECK:        }
+// CHECK-NEXT:   {
+// CHECK:          "commands": [
+// CHECK-NEXT:       {
+// CHECK-NEXT:         "clang-context-hash":
+// CHECK-NEXT:         "clang-module-deps": []
+// CHECK-NEXT:         "command-line": [
+// CHECK-NEXT:           "-cc1"
+// CHECK:                "-o"
+// CHECK-NEXT:           "{{.*}}tu_no_integrated_cpp{{.*}}.i"
+// CHECK:                "-E"
+// CHECK:              ]
+// CHECK-NEXT:         "executable": "clang"
+// CHECK:              "input-file": "[[PREFIX]]{{.}}tu_no_integrated_cpp.c"
+// CHECK-NEXT:       }
+// CHECK-NEXT:       {
+// CHECK-NEXT:         "clang-context-hash":
+// CHECK-NEXT:         "clang-module-deps": []
+// CHECK-NEXT:         "command-line": [
+// CHECK-NEXT:           "-cc1"
+// CHECK:                "-o"
+// CHECK-NEXT:           "{{.*}}tu_no_integrated_cpp.o"
+// CHECK:                "-emit-obj"
+// CHECK:                "{{.*}}tu_no_integrated_cpp{{.*}}.i"
+// CHECK:              ]
+// CHECK-NEXT:         "executable": "clang"
+// CHECK:              "input-file": "[[PREFIX]]{{.}}tu_no_integrated_cpp.c"
+// CHECK-NEXT:       }
+// CHECK-NEXT:     ]
+// CHECK-NEXT:   }
+// CHECK-NEXT:   {
+// CHECK-NEXT:     "commands": [
+// CHECK-NEXT:       {
+// CHECK:              "clang-module-deps": [
+// CHECK-NEXT:           {
+// CHECK:                  "module-name": "Mod"
+// CHECK-NEXT:           }
+// CHECK-NEXT:         ]
+// CHECK-NEXT:         "command-line": [
+// CHECK-NEXT:           "-cc1"
+// CHECK:                "-o"
+// CHECK-NEXT:           "{{.*}}tu_save_temps_module.i"
+// CHECK:                "-E"
+// CHECK:                "-fmodule-file=[[PREFIX]]{{.}}modules{{.*}}Mod-{{.*}}.pcm"
+// CHECK:                "{{.*}}tu_save_temps_module.c"
+// CHECK:              ]
+// CHECK-NEXT:         "executable": "clang"
+// CHECK:              "input-file": "[[PREFIX]]{{.}}tu_save_temps_module.c"
+// CHECK-NEXT:       }
+// CHECK-NEXT:       {
+// CHECK:              "clang-module-deps": [
+// CHECK-NEXT:           {
+// CHECK:                  "module-name": "Mod"
+// CHECK-NEXT:           }
+// CHECK-NEXT:         ]
+// CHECK-NEXT:         "command-line": [
+// CHECK-NEXT:           "-cc1"
+// CHECK:                "-o"
+// CHECK-NEXT:           "{{.*}}tu_save_temps_module.bc"
+// CHECK:                "-emit-llvm-bc"
+// CHECK:                "-fmodule-file=[[PREFIX]]{{.}}modules{{.*}}Mod-{{.*}}.pcm"
+// CHECK:                "{{.*}}tu_save_temps_module.i"
+// CHECK:              ]
+// CHECK-NEXT:         "executable": "clang"
+// CHECK:              "input-file": "[[PREFIX]]{{.}}tu_save_temps_module.c"
+// CHECK-NEXT:       }
+// CHECK-NEXT:       {
+// CHECK:              "clang-module-deps": [
+// CHECK-NEXT:           {
+// CHECK:                  "module-name": "Mod"
+// CHECK-NEXT:           }
+// CHECK-NEXT:         ]
+// CHECK-NEXT:         "command-line": [
+// CHECK-NEXT:           "-cc1"
+// CHECK:                "-o"
+// CHECK-NEXT:           "{{.*}}tu_save_temps_module.s"
+// CHECK:                "-S"
+// CHECK:                "{{.*}}tu_save_temps_module.bc"
+// CHECK:              ]
+// CHECK-NEXT:         "executable": "clang"
+// CHECK:              "input-file": "[[PREFIX]]{{.}}tu_save_temps_module.c"
+// CHECK-NEXT:       }
+// CHECK-NEXT:       {
+// CHECK:              "clang-module-deps": [
+// CHECK-NEXT:           {
+// CHECK:                  "module-name": "Mod"
+// CHECK-NEXT:           }
+// CHECK-NEXT:         ]
+// CHECK-NEXT:         "command-line": [
+// CHECK-NEXT:           "-cc1as"
+// CHECK:                "-o"
+// CHECK-NEXT:           "{{.*}}tu_save_temps_module.o"
+// CHECK:                "{{.*}}tu_save_temps_module.s"
+// CHECK:              ]
+// CHECK-NEXT:         "executable": "clang"
+// CHECK:              "input-file": "[[PREFIX]]{{.}}tu_save_temps_module.c"
+// CHECK-NEXT:       }
+// CHECK-NEXT:     ]
+// CHECK-NEXT:   }
+// CHECK-NEXT: ]
+
+
+//--- cdb.json.in
+[
+  {
+    "directory": "DIR"
+    "command": "clang -c DIR/tu_no_integrated_as.c -no-integrated-as -o DIR/tu_no_integrated_as.o"
+    "file": "DIR/tu_no_integrated_as.c"
+  },
+  {
+    "directory": "DIR"
+    "command": "clang -c DIR/tu_no_integrated_cpp.c -no-integrated-cpp -o DIR/tu_no_integrated_cpp.o"
+    "file": "DIR/tu_no_integrated_cpp.c"
+  },
+  {
+    "directory": "DIR"
+    "command": "clang -c DIR/tu_save_temps_module.c -save-temps=obj -o DIR/tu_save_temps_module.o -fmodules -fimplicit-modules -fimplicit-module-maps"
+    "file": "DIR/tu_save_temps_module.c"
+  }
+]
+
+//--- plain_header.h
+void foo(void);
+
+//--- module_header.h
+void bar(void);
+
+//--- module.modulemap
+module Mod { header "module_header.h" }
+
+//--- tu_save_temps.c
+#include "plain_header.h"
+void tu_save_temps(void) { foo(); }
+
+//--- tu_no_integrated_cpp.c
+#include "plain_header.h"
+void tu_no_integrated_cpp(void) { foo(); }
+
+//--- tu_no_integrated_as.c
+#include "plain_header.h"
+void tu_no_integrated_as(void) { foo(); }
+
+//--- tu_save_temps_module.c
+#include "module_header.h"
+void tu_save_temps(void) { bar(); }
Index: clang/test/ClangScanDeps/modules-pch.c
===================================================================
--- clang/test/ClangScanDeps/modules-pch.c
+++ clang/test/ClangScanDeps/modules-pch.c
@@ -80,7 +80,7 @@
 // CHECK-PCH-NEXT:   ],
 // CHECK-PCH-NEXT:   "translation-units": [
 // CHECK-PCH-NEXT:     {
-// CHECK-PCH-NEXT:       "clang-context-hash": "[[HASH_PCH:.*]]",
+// CHECK-PCH:            "clang-context-hash": "[[HASH_PCH:.*]]",
 // CHECK-PCH-NEXT:       "clang-module-deps": [
 // CHECK-PCH-NEXT:         {
 // CHECK-PCH-NEXT:           "context-hash": "[[HASH_MOD_COMMON_1]]",
@@ -92,18 +92,16 @@
 // CHECK-PCH-NEXT:         }
 // CHECK-PCH-NEXT:       ],
 // CHECK-PCH-NEXT:       "command-line": [
-// CHECK-PCH:              "-fno-implicit-modules",
-// CHECK-PCH-NEXT:         "-fno-implicit-module-maps",
-// CHECK-PCH-NEXT:         "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_COMMON_1]]/ModCommon1-{{.*}}.pcm",
-// CHECK-PCH-NEXT:         "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_PCH]]/ModPCH-{{.*}}.pcm"
-// CHECK-PCH-NEXT:       ],
-// CHECK-PCH-NEXT:       "file-deps": [
+// CHECK-PCH-NOT:          "-fimplicit-modules",
+// CHECK-PCH-NOT:          "-fmplicit-module-maps",
+// CHECK-PCH:              "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_COMMON_1]]/ModCommon1-{{.*}}.pcm",
+// CHECK-PCH:              "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_PCH]]/ModPCH-{{.*}}.pcm"
+// CHECK-PCH:            ],
+// CHECK-PCH:            "file-deps": [
 // CHECK-PCH-NEXT:         "[[PREFIX]]/pch.h"
 // CHECK-PCH-NEXT:       ],
 // CHECK-PCH-NEXT:       "input-file": "[[PREFIX]]/pch.h"
 // CHECK-PCH-NEXT:     }
-// CHECK-PCH-NEXT:   ]
-// CHECK-PCH-NEXT: }
 
 // Explicitly build the PCH:
 //
@@ -146,7 +144,7 @@
 // CHECK-TU-NEXT:   ],
 // CHECK-TU-NEXT:   "translation-units": [
 // CHECK-TU-NEXT:     {
-// CHECK-TU-NEXT:       "clang-context-hash": "[[HASH_TU:.*]]",
+// CHECK-TU:            "clang-context-hash": "[[HASH_TU:.*]]",
 // CHECK-TU-NEXT:       "clang-module-deps": [
 // CHECK-TU-NEXT:         {
 // CHECK-TU-NEXT:           "context-hash": "[[HASH_MOD_TU]]",
@@ -154,18 +152,16 @@
 // CHECK-TU-NEXT:         }
 // CHECK-TU-NEXT:       ],
 // CHECK-TU-NEXT:       "command-line": [
-// CHECK-TU:              "-fno-implicit-modules",
-// CHECK-TU-NEXT:         "-fno-implicit-module-maps",
-// CHECK-TU-NEXT:         "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU]]/ModTU-{{.*}}.pcm"
-// CHECK-TU-NEXT:       ],
-// CHECK-TU-NEXT:       "file-deps": [
+// CHECK-TU-NOT:          "-fimplicit-modules",
+// CHECK-TU-NOT:          "-fimplicit-module-maps",
+// CHECK-TU:              "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU]]/ModTU-{{.*}}.pcm"
+// CHECK-TU:            ],
+// CHECK-TU:            "file-deps": [
 // CHECK-TU-NEXT:         "[[PREFIX]]/tu.c",
 // CHECK-TU-NEXT:         "[[PREFIX]]/pch.h.gch"
 // CHECK-TU-NEXT:       ],
 // CHECK-TU-NEXT:       "input-file": "[[PREFIX]]/tu.c"
 // CHECK-TU-NEXT:     }
-// CHECK-TU-NEXT:   ]
-// CHECK-TU-NEXT: }
 
 // Explicitly build the TU:
 //
@@ -205,7 +201,7 @@
 // CHECK-TU-WITH-COMMON-NEXT:   ],
 // CHECK-TU-WITH-COMMON-NEXT:   "translation-units": [
 // CHECK-TU-WITH-COMMON-NEXT:     {
-// CHECK-TU-WITH-COMMON-NEXT:       "clang-context-hash": "[[HASH_TU_WITH_COMMON:.*]]",
+// CHECK-TU-WITH-COMMON:            "clang-context-hash": "[[HASH_TU_WITH_COMMON:.*]]",
 // CHECK-TU-WITH-COMMON-NEXT:       "clang-module-deps": [
 // CHECK-TU-WITH-COMMON-NEXT:         {
 // CHECK-TU-WITH-COMMON-NEXT:           "context-hash": "[[HASH_MOD_TU_WITH_COMMON]]",
@@ -213,19 +209,17 @@
 // CHECK-TU-WITH-COMMON-NEXT:         }
 // CHECK-TU-WITH-COMMON-NEXT:       ],
 // CHECK-TU-WITH-COMMON-NEXT:       "command-line": [
-// CHECK-TU-WITH-COMMON:              "-fno-implicit-modules",
-// CHECK-TU-WITH-COMMON-NEXT:         "-fno-implicit-module-maps",
-// CHECK-TU-WITH-COMMON-NEXT:         "-fmodule-file=[[PREFIX]]/build/{{.*}}/ModCommon2-{{.*}}.pcm",
-// CHECK-TU-WITH-COMMON-NEXT:         "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU_WITH_COMMON]]/ModTUWithCommon-{{.*}}.pcm"
-// CHECK-TU-WITH-COMMON-NEXT:       ],
-// CHECK-TU-WITH-COMMON-NEXT:       "file-deps": [
+// CHECK-TU-WITH-COMMON-NOT:          "-fimplicit-modules",
+// CHECK-TU-WITH-COMMON-NOT:          "-fimplicit-module-maps",
+// CHECK-TU-WITH-COMMON:              "-fmodule-file=[[PREFIX]]/build/{{.*}}/ModCommon2-{{.*}}.pcm",
+// CHECK-TU-WITH-COMMON:              "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU_WITH_COMMON]]/ModTUWithCommon-{{.*}}.pcm"
+// CHECK-TU-WITH-COMMON:            ],
+// CHECK-TU-WITH-COMMON:            "file-deps": [
 // CHECK-TU-WITH-COMMON-NEXT:         "[[PREFIX]]/tu_with_common.c",
 // CHECK-TU-WITH-COMMON-NEXT:         "[[PREFIX]]/pch.h.gch"
 // CHECK-TU-WITH-COMMON-NEXT:       ],
 // CHECK-TU-WITH-COMMON-NEXT:       "input-file": "[[PREFIX]]/tu_with_common.c"
 // CHECK-TU-WITH-COMMON-NEXT:     }
-// CHECK-TU-WITH-COMMON-NEXT:   ]
-// CHECK-TU-WITH-COMMON-NEXT: }
 
 // Explicitly build the TU that has common modules with the PCH:
 //
Index: clang/test/ClangScanDeps/modules-pch-common-via-submodule.c
===================================================================
--- clang/test/ClangScanDeps/modules-pch-common-via-submodule.c
+++ clang/test/ClangScanDeps/modules-pch-common-via-submodule.c
@@ -38,7 +38,7 @@
 // CHECK-PCH-NEXT:   ],
 // CHECK-PCH-NEXT:   "translation-units": [
 // CHECK-PCH-NEXT:     {
-// CHECK-PCH-NEXT:       "clang-context-hash": "[[HASH_PCH:.*]]",
+// CHECK-PCH:            "clang-context-hash": "[[HASH_PCH:.*]]",
 // CHECK-PCH-NEXT:       "clang-module-deps": [
 // CHECK-PCH-NEXT:         {
 // CHECK-PCH-NEXT:           "context-hash": "[[HASH_MOD_COMMON]]",
@@ -46,17 +46,15 @@
 // CHECK-PCH-NEXT:         }
 // CHECK-PCH-NEXT:       ],
 // CHECK-PCH-NEXT:       "command-line": [
-// CHECK-PCH:              "-fno-implicit-modules"
-// CHECK-PCH-NEXT:         "-fno-implicit-module-maps"
-// CHECK-PCH-NEXT:         "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_COMMON]]/ModCommon-{{.*}}.pcm"
-// CHECK-PCH-NEXT:       ],
-// CHECK-PCH-NEXT:       "file-deps": [
+// CHECK-PCH-NOT:          "-fimplicit-modules"
+// CHECK-PCH-NOT:          "-fimplicit-module-maps"
+// CHECK-PCH:              "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_COMMON]]/ModCommon-{{.*}}.pcm"
+// CHECK-PCH:            ],
+// CHECK-PCH:            "file-deps": [
 // CHECK-PCH-NEXT:         "[[PREFIX]]/pch.h"
 // CHECK-PCH-NEXT:       ],
 // CHECK-PCH-NEXT:       "input-file": "[[PREFIX]]/pch.h"
 // CHECK-PCH-NEXT:     }
-// CHECK-PCH-NEXT:   ]
-// CHECK-PCH-NEXT: }
 
 // Explicitly build the PCH:
 //
@@ -97,7 +95,7 @@
 // CHECK-TU-NEXT:   ],
 // CHECK-TU-NEXT:   "translation-units": [
 // CHECK-TU-NEXT:     {
-// CHECK-TU-NEXT:       "clang-context-hash": "[[HASH_TU:.*]]",
+// CHECK-TU:            "clang-context-hash": "[[HASH_TU:.*]]",
 // CHECK-TU-NEXT:       "clang-module-deps": [
 // CHECK-TU-NEXT:         {
 // CHECK-TU-NEXT:           "context-hash": "[[HASH_MOD_TU]]"
@@ -105,18 +103,16 @@
 // CHECK-TU-NEXT:         }
 // CHECK-TU-NEXT:       ],
 // CHECK-TU-NEXT:       "command-line": [
-// CHECK-TU:              "-fno-implicit-modules",
-// CHECK-TU-NEXT:         "-fno-implicit-module-maps",
-// CHECK-TU-NEXT:         "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU:.*]]/ModTU-{{.*}}.pcm"
-// CHECK-TU-NEXT:       ],
-// CHECK-TU-NEXT:       "file-deps": [
+// CHECK-TU-NOT:          "-fimplicit-modules",
+// CHECK-TU-NOT:          "-fimplicit-module-maps",
+// CHECK-TU:              "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU:.*]]/ModTU-{{.*}}.pcm"
+// CHECK-TU:            ],
+// CHECK-TU:            "file-deps": [
 // CHECK-TU-NEXT:         "[[PREFIX]]/tu.c",
 // CHECK-TU-NEXT:         "[[PREFIX]]/pch.h.gch"
 // CHECK-TU-NEXT:       ],
 // CHECK-TU-NEXT:       "input-file": "[[PREFIX]]/tu.c"
 // CHECK-TU-NEXT:     }
-// CHECK-TU-NEXT:   ]
-// CHECK-TU-NEXT: }
 
 // Explicitly build the TU:
 //
Index: clang/test/ClangScanDeps/modules-pch-common-submodule.c
===================================================================
--- clang/test/ClangScanDeps/modules-pch-common-submodule.c
+++ clang/test/ClangScanDeps/modules-pch-common-submodule.c
@@ -41,7 +41,7 @@
 // CHECK-PCH-NEXT:   ],
 // CHECK-PCH-NEXT:   "translation-units": [
 // CHECK-PCH-NEXT:     {
-// CHECK-PCH-NEXT:       "clang-context-hash": "[[HASH_PCH:.*]]",
+// CHECK-PCH:            "clang-context-hash": "[[HASH_PCH:.*]]",
 // CHECK-PCH-NEXT:       "clang-module-deps": [
 // CHECK-PCH-NEXT:         {
 // CHECK-PCH-NEXT:           "context-hash": "[[HASH_MOD_COMMON]]",
@@ -49,17 +49,15 @@
 // CHECK-PCH-NEXT:         }
 // CHECK-PCH-NEXT:       ],
 // CHECK-PCH-NEXT:       "command-line": [
-// CHECK-PCH:              "-fno-implicit-modules"
-// CHECK-PCH-NEXT:         "-fno-implicit-module-maps"
-// CHECK-PCH-NEXT:         "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_COMMON]]/ModCommon-{{.*}}.pcm"
-// CHECK-PCH-NEXT:       ],
-// CHECK-PCH-NEXT:       "file-deps": [
+// CHECK-PCH-NOT:          "-fimplicit-modules"
+// CHECK-PCH-NOT:          "-fimplicit-module-maps"
+// CHECK-PCH:              "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_COMMON]]/ModCommon-{{.*}}.pcm"
+// CHECK-PCH:            ],
+// CHECK-PCH:            "file-deps": [
 // CHECK-PCH-NEXT:         "[[PREFIX]]/pch.h"
 // CHECK-PCH-NEXT:       ],
 // CHECK-PCH-NEXT:       "input-file": "[[PREFIX]]/pch.h"
 // CHECK-PCH-NEXT:     }
-// CHECK-PCH-NEXT:   ]
-// CHECK-PCH-NEXT: }
 
 // Explicitly build the PCH:
 //
@@ -99,7 +97,7 @@
 // CHECK-TU-NEXT:   ],
 // CHECK-TU-NEXT:   "translation-units": [
 // CHECK-TU-NEXT:     {
-// CHECK-TU-NEXT:       "clang-context-hash": "[[HASH_TU:.*]]",
+// CHECK-TU:            "clang-context-hash": "[[HASH_TU:.*]]",
 // CHECK-TU-NEXT:       "clang-module-deps": [
 // CHECK-TU-NEXT:         {
 // CHECK-TU-NEXT:           "context-hash": "[[HASH_MOD_TU]]"
@@ -107,18 +105,16 @@
 // CHECK-TU-NEXT:         }
 // CHECK-TU-NEXT:       ],
 // CHECK-TU-NEXT:       "command-line": [
-// CHECK-TU:              "-fno-implicit-modules",
-// CHECK-TU-NEXT:         "-fno-implicit-module-maps",
-// CHECK-TU-NEXT:         "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU:.*]]/ModTU-{{.*}}.pcm"
-// CHECK-TU-NEXT:       ],
-// CHECK-TU-NEXT:       "file-deps": [
+// CHECK-TU-NOT:          "-fimplicit-modules",
+// CHECK-TU-NOT:          "-fimplicit-module-maps",
+// CHECK-TU:              "-fmodule-file=[[PREFIX]]/build/[[HASH_MOD_TU:.*]]/ModTU-{{.*}}.pcm"
+// CHECK-TU:            ],
+// CHECK-TU:            "file-deps": [
 // CHECK-TU-NEXT:         "[[PREFIX]]/tu.c",
 // CHECK-TU-NEXT:         "[[PREFIX]]/pch.h.gch"
 // CHECK-TU-NEXT:       ],
 // CHECK-TU-NEXT:       "input-file": "[[PREFIX]]/tu.c"
 // CHECK-TU-NEXT:     }
-// CHECK-TU-NEXT:   ]
-// CHECK-TU-NEXT: }
 
 // Explicitly build the TU:
 //
Index: clang/test/ClangScanDeps/modules-no-undeclared-includes.c
===================================================================
--- clang/test/ClangScanDeps/modules-no-undeclared-includes.c
+++ clang/test/ClangScanDeps/modules-no-undeclared-includes.c
@@ -52,7 +52,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "{{.*}}"
+// CHECK:            "clang-context-hash": "{{.*}}"
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "{{.*}}"
@@ -61,13 +61,11 @@
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "command-line": [
 // CHECK:            ],
-// CHECK-NEXT:       "file-deps": [
+// CHECK:            "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/test.c"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "input-file": "[[PREFIX]]/test.c"
 // CHECK-NEXT:     }
-// CHECK:        ]
-// CHECK-NEXT: }
 
 // RUN: %deps-to-rsp %t/result.json --module-name=User > %t/User.cc1.rsp
 // RUN: %deps-to-rsp %t/result.json --tu-index=0 > %t/tu.rsp
Index: clang/test/ClangScanDeps/modules-inferred.m
===================================================================
--- clang/test/ClangScanDeps/modules-inferred.m
+++ clang/test/ClangScanDeps/modules-inferred.m
@@ -36,7 +36,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
+// CHECK:            "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH_INFERRED]]",
@@ -44,14 +44,12 @@
 // CHECK-NEXT:         }
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "command-line": [
-// CHECK:              "-fno-implicit-modules",
-// CHECK-NEXT:         "-fno-implicit-module-maps",
-// CHECK-NEXT:         "-fmodule-file=[[PREFIX]]/module-cache/[[HASH_INFERRED]]/Inferred-{{[A-Z0-9]+}}.pcm"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "file-deps": [
+// CHECK-NOT:          "-fimplicit-modules",
+// CHECK-NOT:          "-fimplicit-module-maps",
+// CHECK:              "-fmodule-file=[[PREFIX]]/module-cache/[[HASH_INFERRED]]/Inferred-{{[A-Z0-9]+}}.pcm"
+// CHECK:            ],
+// CHECK:            "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/modules_cdb_input.cpp"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "input-file": "[[PREFIX]]/modules_cdb_input.cpp"
 // CHECK-NEXT:     }
-// CHECK-NEXT:   ]
-// CHECK-NEXT: }
Index: clang/test/ClangScanDeps/modules-full.cpp
===================================================================
--- clang/test/ClangScanDeps/modules-full.cpp
+++ clang/test/ClangScanDeps/modules-full.cpp
@@ -88,80 +88,100 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
-// CHECK-NEXT:       "clang-module-deps": [
+// CHECK-NEXT:       "commands": [
 // CHECK-NEXT:         {
-// CHECK-NEXT:           "context-hash": "[[HASH_H1]]",
-// CHECK-NEXT:           "module-name": "header1"
+// CHECK-NEXT:           "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
+// CHECK-NEXT:           "clang-module-deps": [
+// CHECK-NEXT:             {
+// CHECK-NEXT:               "context-hash": "[[HASH_H1]]",
+// CHECK-NEXT:               "module-name": "header1"
+// CHECK-NEXT:             }
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "command-line": [
+// CHECK-NOT:              "-fimplicit-modules"
+// CHECK-NOT:              "-fimplicit-module-maps"
+// CHECK-ABS:              "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
+// CHECK-CUSTOM:           "-fmodule-file=[[PREFIX]]/custom/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
+// CHECK:                ],
+// CHECK-NEXT:           "executable": "{{.*}}clang{{.*}}"
+// CHECK-NEXT:           "file-deps": [
+// CHECK-NEXT:             "[[PREFIX]]/modules_cdb_input.cpp"
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "input-file": "[[PREFIX]]/modules_cdb_input.cpp"
 // CHECK-NEXT:         }
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "command-line": [
-// CHECK:              "-fno-implicit-modules"
-// CHECK-NEXT:         "-fno-implicit-module-maps"
-// CHECK-ABS-NEXT:     "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
-// CHECK-CUSTOM-NEXT:  "-fmodule-file=[[PREFIX]]/custom/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "file-deps": [
-// CHECK-NEXT:         "[[PREFIX]]/modules_cdb_input.cpp"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "input-file": "[[PREFIX]]/modules_cdb_input.cpp"
+// CHECK-NEXT:       ]
 // CHECK-NEXT:     },
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
-// CHECK-NEXT:       "clang-module-deps": [
+// CHECK-NEXT:       "commands": [
 // CHECK-NEXT:         {
-// CHECK-NEXT:           "context-hash": "[[HASH_H1]]",
-// CHECK-NEXT:           "module-name": "header1"
+// CHECK-NEXT:           "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
+// CHECK-NEXT:           "clang-module-deps": [
+// CHECK-NEXT:             {
+// CHECK-NEXT:               "context-hash": "[[HASH_H1]]",
+// CHECK-NEXT:               "module-name": "header1"
+// CHECK-NEXT:             }
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "command-line": [
+// CHECK-NOT:              "-fimplicit-modules"
+// CHECK-NOT:              "-fimplicit-module-maps"
+// CHECK-ABS:              "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
+// CHECK-CUSTOM:           "-fmodule-file=[[PREFIX]]/custom/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
+// CHECK:                ],
+// CHECK-NEXT:           "executable": "{{.*}}clang{{.*}}"
+// CHECK-NEXT:           "file-deps": [
+// CHECK-NEXT:             "[[PREFIX]]/modules_cdb_input.cpp"
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "input-file": "[[PREFIX]]/modules_cdb_input.cpp"
 // CHECK-NEXT:         }
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "command-line": [
-// CHECK:              "-fno-implicit-modules"
-// CHECK-NEXT:         "-fno-implicit-module-maps"
-// CHECK-ABS-NEXT:     "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
-// CHECK-CUSTOM-NEXT:  "-fmodule-file=[[PREFIX]]/custom/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "file-deps": [
-// CHECK-NEXT:         "[[PREFIX]]/modules_cdb_input.cpp"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "input-file": "[[PREFIX]]/modules_cdb_input.cpp"
+// CHECK-NEXT:       ]
 // CHECK-NEXT:     },
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
-// CHECK-NEXT:       "clang-module-deps": [
+// CHECK-NEXT:       "commands": [
 // CHECK-NEXT:         {
-// CHECK-NEXT:           "context-hash": "[[HASH_H1]]",
-// CHECK-NEXT:           "module-name": "header1"
+// CHECK-NEXT:           "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
+// CHECK-NEXT:           "clang-module-deps": [
+// CHECK-NEXT:             {
+// CHECK-NEXT:               "context-hash": "[[HASH_H1]]",
+// CHECK-NEXT:               "module-name": "header1"
+// CHECK-NEXT:             }
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "command-line": [
+// CHECK-NOT:              "-fimplicit-modules"
+// CHECK-NOT:              "-fimplicit-module-maps"
+// CHECK-ABS:              "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
+// CHECK-CUSTOM:           "-fmodule-file=[[PREFIX]]/custom/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
+// CHECK:                ],
+// CHECK-NEXT:           "executable": "{{.*}}clang{{.*}}"
+// CHECK-NEXT:           "file-deps": [
+// CHECK-NEXT:             "[[PREFIX]]/modules_cdb_input.cpp"
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "input-file": "[[PREFIX]]/modules_cdb_input.cpp"
 // CHECK-NEXT:         }
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "command-line": [
-// CHECK:              "-fno-implicit-modules"
-// CHECK-NEXT:         "-fno-implicit-module-maps"
-// CHECK-ABS-NEXT:     "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
-// CHECK-CUSTOM-NEXT:  "-fmodule-file=[[PREFIX]]/custom/[[HASH_H1]]/header1-{{[A-Z0-9]+}}.pcm"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "file-deps": [
-// CHECK-NEXT:         "[[PREFIX]]/modules_cdb_input.cpp"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "input-file": "[[PREFIX]]/modules_cdb_input.cpp"
+// CHECK-NEXT:       ]
 // CHECK-NEXT:     },
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "[[HASH_TU_DINCLUDE:[A-Z0-9]+]]",
-// CHECK-NEXT:       "clang-module-deps": [
+// CHECK-NEXT:       "commands": [
 // CHECK-NEXT:         {
-// CHECK-NEXT:           "context-hash": "[[HASH_H1_DINCLUDE]]",
-// CHECK-NEXT:           "module-name": "header1"
+// CHECK-NEXT:           "clang-context-hash": "[[HASH_TU_DINCLUDE:[A-Z0-9]+]]",
+// CHECK-NEXT:           "clang-module-deps": [
+// CHECK-NEXT:             {
+// CHECK-NEXT:               "context-hash": "[[HASH_H1_DINCLUDE]]",
+// CHECK-NEXT:               "module-name": "header1"
+// CHECK-NEXT:             }
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "command-line": [
+// CHECK-NOT:              "-fimplicit-modules"
+// CHECK-NOT:              "-fimplicit-module-maps"
+// CHECK-ABS:              "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H1_DINCLUDE]]/header1-{{[A-Z0-9]+}}.pcm"
+// CHECK-CUSTOM:           "-fmodule-file=[[PREFIX]]/custom/[[HASH_H1_DINCLUDE]]/header1-{{[A-Z0-9]+}}.pcm"
+// CHECK:                ],
+// CHECK-NEXT:           "executable": "{{.*}}clang{{.*}}"
+// CHECK-NEXT:           "file-deps": [
+// CHECK-NEXT:             "[[PREFIX]]/modules_cdb_input2.cpp"
+// CHECK-NEXT:           ],
+// CHECK-NEXT:           "input-file": "[[PREFIX]]/modules_cdb_input2.cpp"
 // CHECK-NEXT:         }
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "command-line": [
-// CHECK:              "-fno-implicit-modules"
-// CHECK-NEXT:         "-fno-implicit-module-maps"
-// CHECK-ABS-NEXT:     "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H1_DINCLUDE]]/header1-{{[A-Z0-9]+}}.pcm"
-// CHECK-CUSTOM-NEXT:  "-fmodule-file=[[PREFIX]]/custom/[[HASH_H1_DINCLUDE]]/header1-{{[A-Z0-9]+}}.pcm"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "file-deps": [
-// CHECK-NEXT:         "[[PREFIX]]/modules_cdb_input2.cpp"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "input-file": "[[PREFIX]]/modules_cdb_input2.cpp"
+// CHECK-NEXT:       ]
 // CHECK-NEXT:     }
 // CHECK-NEXT:   ]
 // CHECK-NEXT: }
Index: clang/test/ClangScanDeps/modules-fmodule-name-no-module-built.m
===================================================================
--- clang/test/ClangScanDeps/modules-fmodule-name-no-module-built.m
+++ clang/test/ClangScanDeps/modules-fmodule-name-no-module-built.m
@@ -33,7 +33,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
+// CHECK:            "clang-context-hash": "[[HASH_TU:[A-Z0-9]+]]",
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH_H2]]",
@@ -41,16 +41,14 @@
 // CHECK-NEXT:         }
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "command-line": [
-// CHECK:              "-fno-implicit-modules"
-// CHECK-NEXT:         "-fno-implicit-module-maps"
-// CHECK-NEXT:         "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H2]]/header2-{{[A-Z0-9]+}}.pcm"
-// CHECK-NEXT:       ],
-// CHECK-NEXT:       "file-deps": [
+// CHECK-NOT:          "-fimplicit-modules"
+// CHECK-NOT:          "-fimplicit-module-maps"
+// CHECK:              "-fmodule-file=[[PREFIX]]/module-cache{{(_clangcl)?}}/[[HASH_H2]]/header2-{{[A-Z0-9]+}}.pcm"
+// CHECK:            ],
+// CHECK:            "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/modules-fmodule-name-no-module-built.m"
 // CHECK-NEXT:         "[[PREFIX]]/Inputs/header3.h"
 // CHECK-NEXT:         "[[PREFIX]]/Inputs/header.h"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "input-file": "[[PREFIX]]/modules-fmodule-name-no-module-built.m"
 // CHECK-NEXT:     }
-// CHECK-NEXT:   ]
-// CHECK-NEXT: }
Index: clang/test/ClangScanDeps/modules-context-hash.c
===================================================================
--- clang/test/ClangScanDeps/modules-context-hash.c
+++ clang/test/ClangScanDeps/modules-context-hash.c
@@ -40,7 +40,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "{{.*}}",
+// CHECK:            "clang-context-hash": "{{.*}}",
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH_MOD_A]]",
@@ -49,15 +49,13 @@
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "command-line": [
 // CHECK:            ],
-// CHECK-NEXT:       "file-deps": [
+// CHECK:            "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/tu.c"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "input-file": "[[PREFIX]]/tu.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:   ]
-// CHECK-NEXT: }
-// CHECK-NEXT: {
-// CHECK-NEXT:   "modules": [
+
+// CHECK:       "modules": [
 // CHECK-NEXT:     {
 // CHECK-NEXT:       "clang-module-deps": [],
 // CHECK-NEXT:       "clang-modulemap-file": "[[PREFIX]]/module.modulemap",
@@ -79,7 +77,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "{{.*}}",
+// CHECK:            "clang-context-hash": "{{.*}}",
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NOT:            "context-hash": "[[HASH_MOD_A]]",
@@ -88,10 +86,8 @@
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "command-line": [
 // CHECK:            ],
-// CHECK-NEXT:       "file-deps": [
+// CHECK:            "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/tu.c"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "input-file": "[[PREFIX]]/tu.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:   ]
-// CHECK-NEXT: }
Index: clang/test/ClangScanDeps/modules-context-hash-warnings.c
===================================================================
--- clang/test/ClangScanDeps/modules-context-hash-warnings.c
+++ clang/test/ClangScanDeps/modules-context-hash-warnings.c
@@ -39,7 +39,7 @@
 // CHECK:            ]
 // CHECK:            "input-file": "{{.*}}tu1.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:     {
+// CHECK:          {
 // CHECK:            "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH2]]"
Index: clang/test/ClangScanDeps/modules-context-hash-outputs.c
===================================================================
--- clang/test/ClangScanDeps/modules-context-hash-outputs.c
+++ clang/test/ClangScanDeps/modules-context-hash-outputs.c
@@ -35,11 +35,11 @@
 // CHECK-NEXT:         }
 // CHECK-NEXT:       ]
 // CHECK-NEXT:       "command-line": [
-// CHECK:              "-MF"
+// CHECK:              "-dependency-file"
 // CHECK:            ]
 // CHECK:            "input-file": "{{.*}}tu1.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:     {
+// CHECK:          {
 // CHECK:            "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH2]]"
@@ -48,6 +48,7 @@
 // CHECK-NEXT:       ]
 // CHECK-NEXT:       "command-line": [
 // CHECK-NOT:          "-MF"
+// CHECK-NOT:          "-dependency-file"
 // CHECK:            ]
 // CHECK:            "input-file": "{{.*}}tu2.c"
 
Index: clang/test/ClangScanDeps/modules-context-hash-ignore-macros.c
===================================================================
--- clang/test/ClangScanDeps/modules-context-hash-ignore-macros.c
+++ clang/test/ClangScanDeps/modules-context-hash-ignore-macros.c
@@ -38,10 +38,11 @@
 // CHECK-NEXT:       ]
 // CHECK-NEXT:       "command-line": [
 // CHECK-NOT:          "-DFOO"
+// CHECK-NOT:          "FOO"
 // CHECK:            ]
 // CHECK:            "input-file": "{{.*}}tu1.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:     {
+// CHECK:          {
 // CHECK:            "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH_FOO]]"
@@ -49,11 +50,12 @@
 // CHECK-NEXT:         }
 // CHECK-NEXT:       ]
 // CHECK-NEXT:       "command-line": [
-// CHECK:              "-DFOO"
+// CHECK:              "-D"
+// CHECK-NEXT:         "FOO"
 // CHECK:            ]
 // CHECK:            "input-file": "{{.*}}tu2.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:     {
+// CHECK:          {
 // CHECK:            "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH_NO_FOO]]"
@@ -61,8 +63,9 @@
 // CHECK-NEXT:         }
 // CHECK-NEXT:       ]
 // CHECK-NEXT:       "command-line": [
-// CHECK:              "-DFOO"
 // CHECK:              "-fmodules-ignore-macro=FOO"
+// CHECK:              "-D"
+// CHECK-NEXT:         "FOO"
 // CHECK:            ]
 // CHECK:            "input-file": "{{.*}}tu3.c"
 
Index: clang/test/ClangScanDeps/header-search-pruning-transitive.c
===================================================================
--- clang/test/ClangScanDeps/header-search-pruning-transitive.c
+++ clang/test/ClangScanDeps/header-search-pruning-transitive.c
@@ -95,7 +95,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "{{.*}}",
+// CHECK:            "clang-context-hash": "{{.*}}",
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH_X]]",
@@ -104,14 +104,13 @@
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "command-line": [
 // CHECK:            ],
-// CHECK-NEXT:       "file-deps": [
+// CHECK:            "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/test.c"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "input-file": "[[PREFIX]]/test.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:   ]
-// CHECK-NEXT: }
-// CHECK-NEXT: {
+
+// CHECK:      {
 // CHECK-NEXT:   "modules": [
 // CHECK-NEXT:     {
 // CHECK-NEXT:       "clang-module-deps": [
@@ -149,7 +148,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "{{.*}}",
+// CHECK:            "clang-context-hash": "{{.*}}",
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "{{.*}}",
@@ -158,10 +157,8 @@
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "command-line": [
 // CHECK:            ],
-// CHECK-NEXT:       "file-deps": [
+// CHECK:            "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/test.c"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "input-file": "[[PREFIX]]/test.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:   ]
-// CHECK-NEXT: }
Index: clang/test/ClangScanDeps/diagnostics.c
===================================================================
--- clang/test/ClangScanDeps/diagnostics.c
+++ clang/test/ClangScanDeps/diagnostics.c
@@ -28,7 +28,7 @@
 // CHECK-NEXT:   ],
 // CHECK-NEXT:   "translation-units": [
 // CHECK-NEXT:     {
-// CHECK-NEXT:       "clang-context-hash": "[[HASH_TU:.*]],
+// CHECK:            "clang-context-hash": "[[HASH_TU:.*]],
 // CHECK-NEXT:       "clang-module-deps": [
 // CHECK-NEXT:         {
 // CHECK-NEXT:           "context-hash": "[[HASH_MOD]]",
@@ -36,13 +36,11 @@
 // CHECK-NEXT:         }
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "command-line": [
-// CHECK:              "-fno-implicit-modules"
-// CHECK:              "-fno-implicit-module-maps"
+// CHECK-NOT:          "-fimplicit-modules"
+// CHECK-NOT:          "-fimplicit-module-maps"
 // CHECK:            ],
-// CHECK-NEXT:       "file-deps": [
+// CHECK:            "file-deps": [
 // CHECK-NEXT:         "[[PREFIX]]/tu.c"
 // CHECK-NEXT:       ],
 // CHECK-NEXT:       "input-file": "[[PREFIX]]/tu.c"
 // CHECK-NEXT:     }
-// CHECK-NEXT:   ]
-// CHECK-NEXT: }
Index: clang/test/ClangScanDeps/deprecated-driver-api.c
===================================================================
--- /dev/null
+++ clang/test/ClangScanDeps/deprecated-driver-api.c
@@ -0,0 +1,35 @@
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+// RUN: sed -e "s|DIR|%/t|g" %t/cdb.json.in > %t/cdb.json
+
+// RUN: clang-scan-deps -compilation-database=%t/cdb.json -format experimental-full \
+// RUN:   -deprecated-driver-command | sed 's:\\\\\?:/:g' | FileCheck %s
+
+// CHECK: "command-line": [
+// CHECK:   "-c"
+// CHECK:   "{{.*}}tu.c"
+// CHECK:   "-save-temps"
+// CHECK:   "-fno-implicit-modules"
+// CHECK:   "-fno-implicit-module-maps"
+// CHECK: ]
+// CHECK: "file-deps": [
+// CHECK:   "{{.*}}tu.c",
+// CHECK:   "{{.*}}header.h"
+// CHECK: ]
+
+//--- cdb.json.in
+[{
+  "directory": "DIR",
+  "command": "clang -c DIR/tu.c -save-temps",
+  "file": "DIR/tu.c"
+}]
+
+//--- header.h
+void bar(void);
+
+//--- tu.c
+#include "header.h"
+
+void foo(void) {
+  bar();
+}
Index: clang/lib/Tooling/Tooling.cpp
===================================================================
--- clang/lib/Tooling/Tooling.cpp
+++ clang/lib/Tooling/Tooling.cpp
@@ -161,7 +161,7 @@
 
 /// Returns a clang build invocation initialized from the CC1 flags.
 CompilerInvocation *newInvocation(DiagnosticsEngine *Diagnostics,
-                                  const llvm::opt::ArgStringList &CC1Args,
+                                  ArrayRef<const char *> CC1Args,
                                   const char *const BinaryName) {
   assert(!CC1Args.empty() && "Must at least contain the program name!");
   CompilerInvocation *Invocation = new CompilerInvocation;
@@ -339,7 +339,7 @@
 }
 
 bool ToolInvocation::run() {
-  std::vector<const char*> Argv;
+  llvm::opt::ArgStringList Argv;
   for (const std::string &Str : CommandLine)
     Argv.push_back(Str.c_str());
   const char *const BinaryName = Argv[0];
@@ -362,6 +362,17 @@
   SourceManager SrcMgr(*Diagnostics, *Files);
   Diagnostics->setSourceManager(&SrcMgr);
 
+  // We already have a cc1, just create an invocation.
+  if (CommandLine.size() >= 2 && CommandLine[1] == "-cc1") {
+    ArrayRef<const char *> CC1Args = makeArrayRef(Argv).drop_front();
+    std::unique_ptr<CompilerInvocation> Invocation(
+        newInvocation(&*Diagnostics, CC1Args, BinaryName));
+    if (Diagnostics->hasErrorOccurred())
+      return false;
+    return Action->runInvocation(std::move(Invocation), Files,
+                                 std::move(PCHContainerOps), DiagConsumer);
+  }
+
   const std::unique_ptr<driver::Driver> Driver(
       newDriver(&*Diagnostics, BinaryName, &Files->getVirtualFileSystem()));
   // The "input file not found" diagnostics from the driver are useful.
Index: clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
===================================================================
--- clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
+++ clang/lib/Tooling/DependencyScanning/ModuleDepCollector.cpp
@@ -110,17 +110,7 @@
   CI.getLangOpts()->ModuleName = Deps.ID.ModuleName;
   CI.getFrontendOpts().IsSystemModule = Deps.IsSystem;
 
-  // Disable implicit modules and canonicalize options that are only used by
-  // implicit modules.
-  CI.getLangOpts()->ImplicitModules = false;
-  CI.getHeaderSearchOpts().ImplicitModuleMaps = false;
-  CI.getHeaderSearchOpts().ModuleCachePath.clear();
-  CI.getHeaderSearchOpts().ModulesValidateOncePerBuildSession = false;
-  CI.getHeaderSearchOpts().BuildSessionTimestamp = 0;
-  // The specific values we canonicalize to for pruning don't affect behaviour,
-  /// so use the default values so they will be dropped from the command-line.
-  CI.getHeaderSearchOpts().ModuleCachePruneInterval = 7 * 24 * 60 * 60;
-  CI.getHeaderSearchOpts().ModuleCachePruneAfter = 31 * 24 * 60 * 60;
+  clearImplicitModuleBuildOptions(CI);
 
   // Inputs
   InputKind ModuleMapInputKind(CI.getFrontendOpts().DashX.getLanguage(),
@@ -159,21 +149,6 @@
   return CI;
 }
 
-static std::vector<std::string>
-serializeCompilerInvocation(const CompilerInvocation &CI) {
-  // Set up string allocator.
-  llvm::BumpPtrAllocator Alloc;
-  llvm::StringSaver Strings(Alloc);
-  auto SA = [&Strings](const Twine &Arg) { return Strings.save(Arg).data(); };
-
-  // Synthesize full command line from the CompilerInvocation, including "-cc1".
-  SmallVector<const char *, 32> Args{"-cc1"};
-  CI.generateCC1CommandLine(Args, SA);
-
-  // Convert arguments to the return type.
-  return std::vector<std::string>{Args.begin(), Args.end()};
-}
-
 std::vector<std::string> ModuleDeps::getCanonicalCommandLine() const {
   return serializeCompilerInvocation(BuildInvocation);
 }
Index: clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
===================================================================
--- clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
+++ clang/lib/Tooling/DependencyScanning/DependencyScanningWorker.cpp
@@ -7,7 +7,12 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Tooling/DependencyScanning/DependencyScanningWorker.h"
+#include "clang/Basic/DiagnosticFrontend.h"
 #include "clang/CodeGen/ObjectFilePCHContainerOperations.h"
+#include "clang/Driver/Compilation.h"
+#include "clang/Driver/Driver.h"
+#include "clang/Driver/Job.h"
+#include "clang/Driver/Tool.h"
 #include "clang/Frontend/CompilerInstance.h"
 #include "clang/Frontend/CompilerInvocation.h"
 #include "clang/Frontend/FrontendActions.h"
@@ -17,6 +22,7 @@
 #include "clang/Tooling/DependencyScanning/DependencyScanningService.h"
 #include "clang/Tooling/DependencyScanning/ModuleDepCollector.h"
 #include "clang/Tooling/Tooling.h"
+#include "llvm/Support/Host.h"
 
 using namespace clang;
 using namespace tooling;
@@ -155,6 +161,8 @@
     // Restore the value of DisableFree, which may be modified by Tooling.
     OriginalInvocation.getFrontendOpts().DisableFree = DisableFree;
 
+    Consumer.handleInvocation(OriginalInvocation);
+
     // Create a compiler instance to handle the actual work.
     CompilerInstance ScanInstance(std::move(PCHContainerOps));
     ScanInstance.setInvocation(std::move(Invocation));
@@ -310,6 +318,36 @@
                                              llvm::inconvertibleErrorCode());
 }
 
+static bool forEachDriverJob(
+    ArrayRef<std::string> Args, DiagnosticsEngine &Diags, FileManager &FM,
+    llvm::function_ref<bool(const driver::Command &Cmd)> Callback) {
+  std::unique_ptr<driver::Driver> Driver = std::make_unique<driver::Driver>(
+      Args[0], llvm::sys::getDefaultTargetTriple(), Diags,
+      "clang LLVM compiler", &FM.getVirtualFileSystem());
+  Driver->setTitle("clang_based_tool");
+
+  std::vector<const char *> Argv;
+  for (const std::string &Arg : Args)
+    Argv.push_back(Arg.c_str());
+
+  // The "input file not found" diagnostics from the driver are useful.
+  // The driver is only aware of the VFS working directory, but some clients
+  // change this at the FileManager level instead.
+  // In this case the checks have false positives, so skip them.
+  if (!FM.getFileSystemOpts().WorkingDir.empty())
+    Driver->setCheckInputsExist(false);
+  const std::unique_ptr<driver::Compilation> Compilation(
+      Driver->BuildCompilation(llvm::makeArrayRef(Argv)));
+  if (!Compilation)
+    return false;
+
+  for (const driver::Command &Job : Compilation->getJobs()) {
+    if (!Callback(Job))
+      return false;
+  }
+  return true;
+}
+
 llvm::Error DependencyScanningWorker::computeDependencies(
     StringRef WorkingDirectory, const std::vector<std::string> &CommandLine,
     DependencyConsumer &Consumer, llvm::Optional<StringRef> ModuleName) {
@@ -335,24 +373,91 @@
   llvm::transform(CommandLine, FinalCCommandLine.begin(),
                   [](const std::string &Str) { return Str.c_str(); });
 
-  return runWithDiags(CreateAndPopulateDiagOpts(FinalCCommandLine).release(),
-                      [&](DiagnosticConsumer &DC, DiagnosticOptions &DiagOpts) {
-                        // DisableFree is modified by Tooling for running
-                        // in-process; preserve the original value, which is
-                        // always true for a driver invocation.
-                        bool DisableFree = true;
-                        DependencyScanningAction Action(
-                            WorkingDirectory, Consumer, DepFS, Format,
-                            OptimizeArgs, DisableFree, ModuleName);
-                        // Create an invocation that uses the underlying file
-                        // system to ensure that any file system requests that
-                        // are made by the driver do not go through the
-                        // dependency scanning filesystem.
-                        ToolInvocation Invocation(FinalCommandLine, &Action,
-                                                  CurrentFiles.get(),
-                                                  PCHContainerOps);
-                        Invocation.setDiagnosticConsumer(&DC);
-                        Invocation.setDiagnosticOptions(&DiagOpts);
-                        return Invocation.run();
-                      });
+  return runWithDiags(
+      CreateAndPopulateDiagOpts(FinalCCommandLine).release(),
+      [&](DiagnosticConsumer &DC, DiagnosticOptions &DiagOpts) {
+        IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
+            CompilerInstance::createDiagnostics(&DiagOpts, &DC, false);
+        // Although `Diagnostics` are used only for command-line parsing, the
+        // custom `DiagConsumer` might expect a `SourceManager` to be present.
+        SourceManager SrcMgr(*Diags, *CurrentFiles);
+        Diags->setSourceManager(&SrcMgr);
+        bool Scanned = false;
+        bool Success = forEachDriverJob(
+            FinalCommandLine, *Diags, *CurrentFiles,
+            [&](const driver::Command &Cmd) {
+              if (StringRef(Cmd.getCreator().getName()) != "clang") {
+                std::vector<std::string> Args = {Cmd.getArguments().begin(),
+                                                 Cmd.getArguments().end()};
+                Consumer.handleSimpleDriverJob(Cmd.getExecutable(),
+                                               std::move(Args));
+                return true;
+              }
+              if (Scanned) {
+                CompilerInvocation CI;
+                auto Diags = CompilerInstance::createDiagnostics(
+                    &DiagOpts, &DC, /*OwnClient=*/false);
+                if (!CompilerInvocation::CreateFromArgs(
+                        CI, Cmd.getArguments(), *Diags, Cmd.getExecutable()))
+                  return false;
+                Consumer.handleInvocation(std::move(CI));
+                return true;
+              }
+              Scanned = true;
+
+              std::vector<std::string> Argv;
+              Argv.push_back(Cmd.getExecutable());
+              Argv.insert(Argv.end(), Cmd.getArguments().begin(),
+                          Cmd.getArguments().end());
+              // DisableFree is modified by Tooling for running
+              // in-process; preserve the original value, which is
+              // always true for a driver invocation.
+              bool DisableFree = true;
+              DependencyScanningAction Action(WorkingDirectory, Consumer, DepFS,
+                                              Format, OptimizeArgs, DisableFree,
+                                              ModuleName);
+              // Create an invocation that uses the underlying file
+              // system to ensure that any file system requests that
+              // are made by the driver do not go through the
+              // dependency scanning filesystem.
+              ToolInvocation Invocation(std::move(Argv), &Action,
+                                        CurrentFiles.get(), PCHContainerOps);
+              Invocation.setDiagnosticConsumer(&DC);
+              Invocation.setDiagnosticOptions(&DiagOpts);
+              return Invocation.run();
+            });
+
+        if (Success && !Scanned) {
+          Diags->Report(diag::err_fe_expected_compiler_job)
+              << llvm::join(FinalCommandLine, " ");
+        }
+        return Success && Scanned;
+      });
+}
+
+void dependencies::clearImplicitModuleBuildOptions(CompilerInvocation &CI) {
+  CI.getLangOpts()->ImplicitModules = false;
+  CI.getHeaderSearchOpts().ImplicitModuleMaps = false;
+  CI.getHeaderSearchOpts().ModuleCachePath.clear();
+  CI.getHeaderSearchOpts().ModulesValidateOncePerBuildSession = false;
+  CI.getHeaderSearchOpts().BuildSessionTimestamp = 0;
+  // The specific values we canonicalize to for pruning don't affect behaviour,
+  /// so use the default values so they will be dropped from the command-line.
+  CI.getHeaderSearchOpts().ModuleCachePruneInterval = 7 * 24 * 60 * 60;
+  CI.getHeaderSearchOpts().ModuleCachePruneAfter = 31 * 24 * 60 * 60;
+}
+
+std::vector<std::string>
+dependencies::serializeCompilerInvocation(const CompilerInvocation &CI) {
+  // Set up string allocator.
+  llvm::BumpPtrAllocator Alloc;
+  llvm::StringSaver Strings(Alloc);
+  auto SA = [&Strings](const Twine &Arg) { return Strings.save(Arg).data(); };
+
+  // Synthesize full command line from the CompilerInvocation, including "-cc1".
+  SmallVector<const char *, 32> Args{"-cc1"};
+  CI.generateCC1CommandLine(Args, SA);
+
+  // Convert arguments to the return type.
+  return std::vector<std::string>{Args.begin(), Args.end()};
 }
Index: clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp
===================================================================
--- clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp
+++ clang/lib/Tooling/DependencyScanning/DependencyScanningTool.cpp
@@ -45,6 +45,10 @@
   /// Prints out all of the gathered dependencies into a string.
   class MakeDependencyPrinterConsumer : public DependencyConsumer {
   public:
+    void handleSimpleDriverJob(std::string Executable,
+                               std::vector<std::string> Args) override {}
+    void handleInvocation(CompilerInvocation CI) override {}
+
     void
     handleDependencyOutputOpts(const DependencyOutputOptions &Opts) override {
       this->Opts = std::make_unique<DependencyOutputOptions>(Opts);
@@ -119,14 +123,92 @@
       Worker.computeDependencies(CWD, CommandLine, Consumer, ModuleName);
   if (Result)
     return std::move(Result);
-  return Consumer.getFullDependencies(CommandLine);
+  return Consumer.takeFullDependencies();
+}
+
+llvm::Expected<FullDependenciesResult>
+DependencyScanningTool::getFullDependenciesLegacyDriverCommand(
+    const std::vector<std::string> &CommandLine, StringRef CWD,
+    const llvm::StringSet<> &AlreadySeen,
+    LookupModuleOutputCallback LookupModuleOutput,
+    llvm::Optional<StringRef> ModuleName) {
+  FullDependencyConsumer Consumer(AlreadySeen, LookupModuleOutput);
+  llvm::Error Result =
+      Worker.computeDependencies(CWD, CommandLine, Consumer, ModuleName);
+  if (Result)
+    return std::move(Result);
+  return Consumer.getFullDependenciesLegacyDriverCommand(CommandLine);
+}
+
+Command::~Command() = default;
+CC1Command::CC1Command(CompilerInvocation CI)
+    : Command(CK_CC1), BuildInvocation(std::move(CI)) {}
+std::string CC1Command::getExecutable() {
+  // FIXME: get the real value
+  return "clang";
+}
+std::vector<std::string> CC1Command::getArguments() {
+  return serializeCompilerInvocation(BuildInvocation);
+}
+
+void FullDependencyConsumer::handleInvocation(CompilerInvocation CI) {
+  clearImplicitModuleBuildOptions(CI);
+  Commands.push_back(std::make_unique<CC1Command>(std::move(CI)));
+}
+
+static bool needsModules(FrontendInputFile FIF) {
+  switch (FIF.getKind().getLanguage()) {
+  case Language::Unknown:
+  case Language::Asm:
+  case Language::LLVM_IR:
+    return false;
+  default:
+    return true;
+  }
+}
+
+FullDependenciesResult FullDependencyConsumer::takeFullDependencies() {
+  FullDependenciesResult FDR;
+  FullDependencies &FD = FDR.FullDeps;
+
+  FD.ID.ContextHash = std::move(ContextHash);
+  FD.FileDeps = std::move(Dependencies);
+  FD.PrebuiltModuleDeps = std::move(PrebuiltModuleDeps);
+  FD.Commands = std::move(Commands);
+
+  for (auto &&M : ClangModuleDeps) {
+    auto &MD = M.second;
+    if (MD.ImportedByMainFile)
+      FD.ClangModuleDeps.push_back(MD.ID);
+    // TODO: Avoid handleModuleDependency even being called for modules
+    //   we've already seen.
+    if (AlreadySeen.count(M.first))
+      continue;
+    FDR.DiscoveredModules.push_back(std::move(MD));
+  }
+
+  for (auto &Command : FD.Commands) {
+    if (auto *CC1 = dyn_cast<CC1Command>(Command.get())) {
+      auto &FrontendOpts = CC1->BuildInvocation.getFrontendOpts();
+      if (llvm::any_of(FrontendOpts.Inputs, needsModules)) {
+        for (const auto &PMD : FD.PrebuiltModuleDeps)
+          FrontendOpts.ModuleFiles.push_back(PMD.PCMFile);
+        for (const auto &ID : FD.ClangModuleDeps)
+          FrontendOpts.ModuleFiles.push_back(
+              LookupModuleOutput(ID, ModuleOutputKind::ModuleFile));
+      }
+    }
+  }
+
+  return FDR;
 }
 
-FullDependenciesResult FullDependencyConsumer::getFullDependencies(
+FullDependenciesResult
+FullDependencyConsumer::getFullDependenciesLegacyDriverCommand(
     const std::vector<std::string> &OriginalCommandLine) const {
   FullDependencies FD;
 
-  FD.CommandLine = makeTUCommandLineWithoutPaths(
+  FD.DriverCommandLine = makeTUCommandLineWithoutPaths(
       ArrayRef<std::string>(OriginalCommandLine).slice(1));
 
   FD.ID.ContextHash = std::move(ContextHash);
@@ -134,13 +216,13 @@
   FD.FileDeps.assign(Dependencies.begin(), Dependencies.end());
 
   for (const PrebuiltModuleDep &PMD : PrebuiltModuleDeps)
-    FD.CommandLine.push_back("-fmodule-file=" + PMD.PCMFile);
+    FD.DriverCommandLine.push_back("-fmodule-file=" + PMD.PCMFile);
 
   for (auto &&M : ClangModuleDeps) {
     auto &MD = M.second;
     if (MD.ImportedByMainFile) {
       FD.ClangModuleDeps.push_back(MD.ID);
-      FD.CommandLine.push_back(
+      FD.DriverCommandLine.push_back(
           "-fmodule-file=" +
           LookupModuleOutput(MD.ID, ModuleOutputKind::ModuleFile));
     }
Index: clang/include/clang/Tooling/Tooling.h
===================================================================
--- clang/include/clang/Tooling/Tooling.h
+++ clang/include/clang/Tooling/Tooling.h
@@ -508,7 +508,7 @@
 
 /// Creates a \c CompilerInvocation.
 CompilerInvocation *newInvocation(DiagnosticsEngine *Diagnostics,
-                                  const llvm::opt::ArgStringList &CC1Args,
+                                  ArrayRef<const char *> CC1Args,
                                   const char *const BinaryName);
 
 } // namespace tooling
Index: clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h
===================================================================
--- clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h
+++ clang/include/clang/Tooling/DependencyScanning/DependencyScanningWorker.h
@@ -32,6 +32,10 @@
 public:
   virtual ~DependencyConsumer() {}
 
+  virtual void handleSimpleDriverJob(std::string Executable,
+                                     std::vector<std::string> Args) = 0;
+  virtual void handleInvocation(clang::CompilerInvocation CI) = 0;
+
   virtual void
   handleDependencyOutputOpts(const DependencyOutputOptions &Opts) = 0;
 
@@ -89,6 +93,14 @@
   bool OptimizeArgs;
 };
 
+/// Disable implicit modules and canonicalize options that are only used by
+/// implicit modules.
+void clearImplicitModuleBuildOptions(CompilerInvocation &CI);
+
+/// Serialize the given invocation to -cc1 arguments, not including \c argv[0].
+std::vector<std::string>
+serializeCompilerInvocation(const CompilerInvocation &CI);
+
 } // end namespace dependencies
 } // end namespace tooling
 } // end namespace clang
Index: clang/include/clang/Tooling/DependencyScanning/DependencyScanningTool.h
===================================================================
--- clang/include/clang/Tooling/DependencyScanning/DependencyScanningTool.h
+++ clang/include/clang/Tooling/DependencyScanning/DependencyScanningTool.h
@@ -14,8 +14,9 @@
 #include "clang/Tooling/DependencyScanning/ModuleDepCollector.h"
 #include "clang/Tooling/JSONCompilationDatabase.h"
 #include "llvm/ADT/MapVector.h"
-#include "llvm/ADT/StringSet.h"
 #include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringSet.h"
+#include "llvm/Support/Casting.h"
 #include <string>
 #include <vector>
 
@@ -27,6 +28,58 @@
 using LookupModuleOutputCallback =
     llvm::function_ref<std::string(const ModuleID &, ModuleOutputKind)>;
 
+/// An abstract command-line tool invocation that is part of building a TU.
+///
+/// \see FullDependencies::Commands.
+class Command {
+public:
+  virtual ~Command();
+
+  /// The name or path of the executable to run.
+  virtual std::string getExecutable() = 0;
+
+  /// The command-line arguments to pass.
+  virtual std::vector<std::string> getArguments() = 0;
+
+  enum CommandKind {
+    CK_CC1,
+    CK_Simple,
+  };
+
+  /// The command kind, used for casting.
+  CommandKind getKind() const { return Kind; }
+
+protected:
+  Command(CommandKind Kind) : Kind(Kind) {}
+  CommandKind Kind;
+};
+
+/// An invocation of 'clang -cc1', represented by a \c CompilerInvocation.
+class CC1Command : public Command {
+public:
+  CC1Command(CompilerInvocation CI);
+  CompilerInvocation BuildInvocation;
+
+  std::string getExecutable() override;
+  std::vector<std::string> getArguments() override;
+
+  static bool classof(const Command *C) { return C->getKind() == CK_CC1; }
+};
+
+class SimpleCommand : public Command {
+public:
+  SimpleCommand(std::string Executable, std::vector<std::string> Arguments)
+      : Command(CK_Simple), Executable(std::move(Executable)),
+        Arguments(std::move(Arguments)) {}
+  std::string Executable;
+  std::vector<std::string> Arguments;
+
+  std::string getExecutable() override { return Executable; }
+  std::vector<std::string> getArguments() override { return Arguments; }
+
+  static bool classof(const Command *C) { return C->getKind() == CK_Simple; }
+};
+
 /// The full dependencies and module graph for a specific input.
 struct FullDependencies {
   /// The identifier of the C++20 module this translation unit exports.
@@ -49,8 +102,16 @@
   /// determined that the differences are benign for this compilation.
   std::vector<ModuleID> ClangModuleDeps;
 
-  /// The command line of the TU (excluding the compiler executable).
-  std::vector<std::string> CommandLine;
+  /// The sequence of commands required to build the translation unit. Commands
+  /// should be executed in order.
+  ///
+  /// FIXME: If we add support for multi-arch builds in clang-scan-deps, we
+  /// should make the dependencies between commands explicit to enable parallel
+  /// builds of each architecture.
+  std::vector<std::unique_ptr<Command>> Commands;
+
+  /// Deprecated.
+  std::vector<std::string> DriverCommandLine;
 };
 
 struct FullDependenciesResult {
@@ -99,6 +160,12 @@
                       LookupModuleOutputCallback LookupModuleOutput,
                       llvm::Optional<StringRef> ModuleName = None);
 
+  llvm::Expected<FullDependenciesResult> getFullDependenciesLegacyDriverCommand(
+      const std::vector<std::string> &CommandLine, StringRef CWD,
+      const llvm::StringSet<> &AlreadySeen,
+      LookupModuleOutputCallback LookupModuleOutput,
+      llvm::Optional<StringRef> ModuleName = None);
+
 private:
   DependencyScanningWorker Worker;
 };
@@ -109,6 +176,14 @@
                          LookupModuleOutputCallback LookupModuleOutput)
       : AlreadySeen(AlreadySeen), LookupModuleOutput(LookupModuleOutput) {}
 
+  void handleSimpleDriverJob(std::string Executable,
+                             std::vector<std::string> Args) override {
+    Commands.push_back(std::make_unique<SimpleCommand>(std::move(Executable),
+                                                       std::move(Args)));
+  }
+
+  void handleInvocation(CompilerInvocation CI) override;
+
   void handleDependencyOutputOpts(const DependencyOutputOptions &) override {}
 
   void handleFileDependency(StringRef File) override {
@@ -132,14 +207,17 @@
     return LookupModuleOutput(ID, Kind);
   }
 
-  FullDependenciesResult getFullDependencies(
+  FullDependenciesResult getFullDependenciesLegacyDriverCommand(
       const std::vector<std::string> &OriginalCommandLine) const;
 
+  FullDependenciesResult takeFullDependencies();
+
 private:
   std::vector<std::string> Dependencies;
   std::vector<PrebuiltModuleDep> PrebuiltModuleDeps;
   llvm::MapVector<std::string, ModuleDeps, llvm::StringMap<unsigned>>
       ClangModuleDeps;
+  std::vector<std::unique_ptr<Command>> Commands;
   std::string ContextHash;
   std::vector<std::string> OutputPaths;
   const llvm::StringSet<> &AlreadySeen;
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