Use -frewrite-includes for crash reports.

In future changes we should:
* use __builtin_trap rather than derefing 'random' volatile pointers.
* avoid dumping temporary files into /tmp when running tests, instead
  preferring a location that is properly cleaned up by lit.

Review by Chandler Carruth.

llvm-svn: 159469

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index a6af7af7718..2f2d07c8b97 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -392,6 +392,7 @@ void Driver::generateCompilationDiagnostics(Compilation &C,
   // Suppress driver output and emit preprocessor output to temp file.
   CCCIsCPP = true;
   CCGenDiagnostics = true;
+  C.getArgs().AddFlagArg(0, Opts->getOption(options::OPT_frewrite_includes));
 
   // Save the original job command(s).
   std::string Cmd;
@@ -1181,7 +1182,10 @@ Action *Driver::ConstructPhaseAction(const ArgList &Args, phases::ID Phase,
     if (Args.hasArg(options::OPT_M, options::OPT_MM)) {
       OutputTy = types::TY_Dependencies;
     } else {
-      OutputTy = types::getPreprocessedType(Input->getType());
+      OutputTy = Input->getType();
+      if (!Args.hasFlag(options::OPT_frewrite_includes,
+                        options::OPT_fno_rewrite_includes, false))
+        OutputTy = types::getPreprocessedType(OutputTy);
       assert(OutputTy != types::TY_INVALID &&
              "Cannot preprocess this input type!");
     }