Index: compiler-rt/lib/sanitizer_common/sanitizer_posix.cpp
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_posix.cpp
+++ compiler-rt/lib/sanitizer_common/sanitizer_posix.cpp
@@ -159,6 +159,7 @@
     case RdOnly: flags = O_RDONLY; break;
     case WrOnly: flags = O_WRONLY | O_CREAT | O_TRUNC; break;
     case RdWr: flags = O_RDWR | O_CREAT; break;
+    default: Die();
   }
   fd_t res = internal_open(filename, flags, 0660);
   if (internal_iserror(res, errno_p))
Index: compiler-rt/lib/sanitizer_common/sanitizer_stack_store.cpp
===================================================================
--- compiler-rt/lib/sanitizer_common/sanitizer_stack_store.cpp
+++ compiler-rt/lib/sanitizer_common/sanitizer_stack_store.cpp
@@ -187,7 +187,7 @@
   }
 
   uptr operator*() {
-    sptr diff;
+    sptr diff = 0;
     begin = DecodeSLEB128(begin, end, &diff);
     previous += diff;
     return previous;
Index: compiler-rt/lib/tsan/rtl/tsan_rtl.h
===================================================================
--- compiler-rt/lib/tsan/rtl/tsan_rtl.h
+++ compiler-rt/lib/tsan/rtl/tsan_rtl.h
@@ -684,7 +684,7 @@
 
 template <typename EventT>
 void TraceEvent(ThreadState *thr, EventT ev) {
-  EventT *evp;
+  EventT *evp = nullptr;
   if (!TraceAcquire(thr, &evp)) {
     TraceSwitchPart(thr);
     UNUSED bool res = TraceAcquire(thr, &evp);
Index: compiler-rt/lib/ubsan/ubsan_handlers_cxx.cpp
===================================================================
--- compiler-rt/lib/ubsan/ubsan_handlers_cxx.cpp
+++ compiler-rt/lib/ubsan/ubsan_handlers_cxx.cpp
@@ -127,6 +127,7 @@
     break;
   case CFITCK_ICall:
   case CFITCK_NVMFCall:
+  default:
     Die();
   }