2 files changed, 18 insertions, 8 deletions
diff --git a/clang/tools/clang-scan-deps/ClangScanDeps.cpp b/clang/tools/clang-scan-deps/ClangScanDeps.cpp
index e41f4eb..c11a348 100644
--- a/clang/tools/clang-scan-deps/ClangScanDeps.cpp
+++ b/clang/tools/clang-scan-deps/ClangScanDeps.cpp
@@ -106,6 +106,7 @@ static constexpr bool DoRoundTripDefault = false;
 #endif
 
 static bool RoundTripArgs = DoRoundTripDefault;
+static bool VerbatimArgs = false;
 
 static void ParseArgs(int argc, char **argv) {
   ScanDepsOptTable Tbl;
@@ -239,6 +240,8 @@ static void ParseArgs(int argc, char **argv) {
 
   RoundTripArgs = Args.hasArg(OPT_round_trip_args);
 
+  VerbatimArgs = Args.hasArg(OPT_verbatim_args);
+
   if (const llvm::opt::Arg *A = Args.getLastArgNoClaim(OPT_DASH_DASH))
     CommandLine.assign(A->getValues().begin(), A->getValues().end());
 }
@@ -883,14 +886,16 @@ int clang_scan_deps_main(int argc, char **argv, const llvm::ToolContext &) {
 
   llvm::cl::PrintOptionValues();
 
-  // Expand response files in advance, so that we can "see" all the arguments
-  // when adjusting below.
-  Compilations = expandResponseFiles(std::move(Compilations),
-                                     llvm::vfs::getRealFileSystem());
+  if (!VerbatimArgs) {
+    // Expand response files in advance, so that we can "see" all the arguments
+    // when adjusting below.
+    Compilations = expandResponseFiles(std::move(Compilations),
+                                       llvm::vfs::getRealFileSystem());
 
-  Compilations = inferTargetAndDriverMode(std::move(Compilations));
+    Compilations = inferTargetAndDriverMode(std::move(Compilations));
 
-  Compilations = inferToolLocation(std::move(Compilations));
+    Compilations = inferToolLocation(std::move(Compilations));
+  }
 
   // The command options are rewritten to run Clang in preprocessor only mode.
   auto AdjustingCompilations =
@@ -898,7 +903,7 @@ int clang_scan_deps_main(int argc, char **argv, const llvm::ToolContext &) {
           std::move(Compilations));
   ResourceDirectoryCache ResourceDirCache;
 
-  AdjustingCompilations->appendArgumentsAdjuster(
+  auto ArgsAdjuster =
       [&ResourceDirCache](const tooling::CommandLineArguments &Args,
                           StringRef FileName) {
         std::string LastO;
@@ -960,7 +965,10 @@ int clang_scan_deps_main(int argc, char **argv, const llvm::ToolContext &) {
         }
         AdjustedArgs.insert(AdjustedArgs.end(), FlagsEnd, Args.end());
         return AdjustedArgs;
-      });
+      };
+
+  if (!VerbatimArgs)
+    AdjustingCompilations->appendArgumentsAdjuster(ArgsAdjuster);
 
   SharedStream Errs(llvm::errs());
 
diff --git a/clang/tools/clang-scan-deps/Opts.td b/clang/tools/clang-scan-deps/Opts.td
index 03011f9..7a63b18 100644
--- a/clang/tools/clang-scan-deps/Opts.td
+++ b/clang/tools/clang-scan-deps/Opts.td
@@ -44,4 +44,6 @@ def verbose : F<"v", "Use verbose output">;
 
 def round_trip_args : F<"round-trip-args", "verify that command-line arguments are canonical by parsing and re-serializing">;
 
+def verbatim_args : F<"verbatim-args", "Pass commands to the scanner verbatim without adjustments">;
+
 def DASH_DASH : Option<["--"], "", KIND_REMAINING_ARGS>;