Index: compiler-rt/trunk/lib/ubsan/ubsan_flags.cpp
===================================================================
--- compiler-rt/trunk/lib/ubsan/ubsan_flags.cpp
+++ compiler-rt/trunk/lib/ubsan/ubsan_flags.cpp
@@ -54,7 +54,6 @@
   {
     CommonFlags cf;
     cf.CopyFrom(*common_flags());
-    cf.print_summary = false;
     cf.external_symbolizer_path = GetFlag("UBSAN_SYMBOLIZER_PATH");
     OverrideCommonFlags(cf);
   }
Index: compiler-rt/trunk/test/ubsan/TestCases/Misc/print_summary.c
===================================================================
--- compiler-rt/trunk/test/ubsan/TestCases/Misc/print_summary.c
+++ compiler-rt/trunk/test/ubsan/TestCases/Misc/print_summary.c
@@ -0,0 +1,11 @@
+// RUN: %clang -fsanitize=undefined %s -O3 -o %t
+// RUN: %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-DEFAULT
+// RUN: %env_ubsan_opts=print_summary=0 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-NO_SUMMARY
+
+// CHECK-DEFAULT: SUMMARY: UndefinedBehaviorSanitizer: {{.*}}
+// CHECK-NO_SUMMARY-NOT: SUMMARY: UndefinedBehaviorSanitizer: {{.*}}
+
+int main(int argc, char **argv) {
+  int arr[argc - 2];
+  return 0;
+}