Index: cfe/trunk/include/clang/Driver/Compilation.h
===================================================================
--- cfe/trunk/include/clang/Driver/Compilation.h
+++ cfe/trunk/include/clang/Driver/Compilation.h
@@ -122,6 +122,9 @@
   /// Whether an error during the parsing of the input args.
   bool ContainsError;
 
+  /// Whether to keep temporary files regardless of -save-temps.
+  bool ForceKeepTempFiles = false;
+
 public:
   Compilation(const Driver &D, const ToolChain &DefaultToolChain,
               llvm::opt::InputArgList *Args,
Index: cfe/trunk/lib/Driver/Compilation.cpp
===================================================================
--- cfe/trunk/lib/Driver/Compilation.cpp
+++ cfe/trunk/lib/Driver/Compilation.cpp
@@ -45,6 +45,11 @@
 }
 
 Compilation::~Compilation() {
+  // Remove temporary files. This must be done before arguments are freed, as
+  // the file names might be derived from the input arguments.
+  if (!TheDriver.isSaveTempsEnabled() && !ForceKeepTempFiles)
+    CleanupFileList(TempFiles);
+
   delete TranslatedArgs;
   delete Args;
 
@@ -245,6 +250,10 @@
   AllActions.clear();
   Jobs.clear();
 
+  // Remove temporary files.
+  if (!TheDriver.isSaveTempsEnabled() && !ForceKeepTempFiles)
+    CleanupFileList(TempFiles);
+
   // Clear temporary/results file lists.
   TempFiles.clear();
   ResultFiles.clear();
@@ -262,6 +271,9 @@
 
   // Redirect stdout/stderr to /dev/null.
   Redirects = {None, {""}, {""}};
+
+  // Temporary files added by diagnostics should be kept.
+  ForceKeepTempFiles = true;
 }
 
 StringRef Compilation::getSysRoot() const {
Index: cfe/trunk/lib/Driver/Driver.cpp
===================================================================
--- cfe/trunk/lib/Driver/Driver.cpp
+++ cfe/trunk/lib/Driver/Driver.cpp
@@ -1243,9 +1243,6 @@
 
   // If any of the preprocessing commands failed, clean up and exit.
   if (!FailingCommands.empty()) {
-    if (!isSaveTempsEnabled())
-      C.CleanupFileList(C.getTempFiles(), true);
-
     Diag(clang::diag::note_drv_command_failed_diag_msg)
         << "Error generating preprocessed source(s).";
     return;
@@ -1362,9 +1359,6 @@
 
   C.ExecuteJobs(C.getJobs(), FailingCommands);
 
-  // Remove temp files.
-  C.CleanupFileList(C.getTempFiles());
-
   // If the command succeeded, we are done.
   if (FailingCommands.empty())
     return 0;
Index: clang-tools-extra/trunk/test/clang-tidy/pr37091.cpp
===================================================================
--- clang-tools-extra/trunk/test/clang-tidy/pr37091.cpp
+++ clang-tools-extra/trunk/test/clang-tidy/pr37091.cpp
@@ -0,0 +1,10 @@
+// REQUIRES: shell
+// RUN: rm -rf %t
+// RUN: mkdir -p %t
+
+// This is a reproducer for PR37091.
+//
+// Verify that no temporary files are left behind by the clang-tidy invocation.
+
+// RUN: env TMPDIR=%t TEMP=%t TMP=%t clang-tidy %s -- --target=mips64
+// RUN: rmdir %t