Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_flag_parser.h
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_flag_parser.h
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_flag_parser.h
@@ -34,25 +34,41 @@
   bool Parse(const char *value) final;
 };
 
-template <>
-inline bool FlagHandler<bool>::Parse(const char *value) {
+inline bool ParseBool(const char *value, bool *b) {
   if (internal_strcmp(value, "0") == 0 ||
       internal_strcmp(value, "no") == 0 ||
       internal_strcmp(value, "false") == 0) {
-    *t_ = false;
+    *b = false;
     return true;
   }
   if (internal_strcmp(value, "1") == 0 ||
       internal_strcmp(value, "yes") == 0 ||
       internal_strcmp(value, "true") == 0) {
-    *t_ = true;
+    *b = true;
     return true;
   }
+  return false;
+}
+
+template <>
+inline bool FlagHandler<bool>::Parse(const char *value) {
+  if (ParseBool(value, t_)) return true;
   Printf("ERROR: Invalid value for bool option: '%s'\n", value);
   return false;
 }
 
 template <>
+inline bool FlagHandler<HandleSignalMode>::Parse(const char *value) {
+  bool b;
+  if (ParseBool(value, &b)) {
+    *t_ = b ? kHandleSignalYes : kHandleSignalNo;
+    return true;
+  }
+  Printf("ERROR: Invalid value for signal handler option: '%s'\n", value);
+  return false;
+}
+
+template <>
 inline bool FlagHandler<const char *>::Parse(const char *value) {
   *t_ = internal_strdup(value);
   return true;
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.h
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.h
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.h
@@ -18,6 +18,11 @@
 
 namespace __sanitizer {
 
+enum HandleSignalMode {
+  kHandleSignalNo,
+  kHandleSignalYes,
+};
+
 struct CommonFlags {
 #define COMMON_FLAG(Type, Name, DefaultValue, Description) Type Name;
 #include "sanitizer_flags.inc"
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_flags.inc
@@ -78,16 +78,20 @@
             "OS X only. 0 = don't print, 1 = print only once before process "
             "exits, 2 = print after each report.")
 COMMON_FLAG(bool, check_printf, true, "Check printf arguments.")
-COMMON_FLAG(bool, handle_segv, true,
-            "If set, registers the tool's custom SIGSEGV handler.")
-COMMON_FLAG(bool, handle_sigbus, true,
-            "If set, registers the tool's custom SIGBUS handler.")
-COMMON_FLAG(bool, handle_abort, false,
-            "If set, registers the tool's custom SIGABRT handler.")
-COMMON_FLAG(bool, handle_sigill, false,
-            "If set, registers the tool's custom SIGILL handler.")
-COMMON_FLAG(bool, handle_sigfpe, true,
-            "If set, registers the tool's custom SIGFPE handler.")
+#define COMMON_FLAG_HANDLE_SIGNAL_HELP(signal) \
+    "Controls custom tool's " #signal " handler (0 - do not registers the " \
+    "handler, 1 - register the handler). "
+COMMON_FLAG(HandleSignalMode, handle_segv, kHandleSignalYes,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGSEGV))
+COMMON_FLAG(HandleSignalMode, handle_sigbus, kHandleSignalYes,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGBUS))
+COMMON_FLAG(HandleSignalMode, handle_abort, kHandleSignalNo,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGABRT))
+COMMON_FLAG(HandleSignalMode, handle_sigill, kHandleSignalNo,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGILL))
+COMMON_FLAG(HandleSignalMode, handle_sigfpe, kHandleSignalYes,
+            COMMON_FLAG_HANDLE_SIGNAL_HELP(SIGFPE))
+#undef COMMON_FLAG_HANDLE_SIGNAL_HELP
 COMMON_FLAG(bool, allow_user_segv_handler, false,
             "If set, allows user to register a SEGV handler even if the tool "
             "registers one.")
Index: compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_flags_test.cc
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_flags_test.cc
+++ compiler-rt/trunk/lib/sanitizer_common/tests/sanitizer_flags_test.cc
@@ -67,6 +67,28 @@
                "Invalid value for bool option: '2'");
   EXPECT_DEATH(TestFlag(false, "flag_name=-1", true),
                "Invalid value for bool option: '-1'");
+  EXPECT_DEATH(TestFlag(false, "flag_name=on", true),
+               "Invalid value for bool option: 'on'");
+}
+
+TEST(SanitizerCommon, HandleSignalMode) {
+  TestFlag(kHandleSignalNo, "flag_name=1", kHandleSignalYes);
+  TestFlag(kHandleSignalNo, "flag_name=yes", kHandleSignalYes);
+  TestFlag(kHandleSignalNo, "flag_name=true", kHandleSignalYes);
+  TestFlag(kHandleSignalYes, "flag_name=0", kHandleSignalNo);
+  TestFlag(kHandleSignalYes, "flag_name=no", kHandleSignalNo);
+  TestFlag(kHandleSignalYes, "flag_name=false", kHandleSignalNo);
+
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name", kHandleSignalNo),
+               "expected '='");
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name=", kHandleSignalNo),
+               "Invalid value for signal handler option: ''");
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name=2", kHandleSignalNo),
+               "Invalid value for signal handler option: '2'");
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name=-1", kHandleSignalNo),
+               "Invalid value for signal handler option: '-1'");
+  EXPECT_DEATH(TestFlag(kHandleSignalNo, "flag_name=on", kHandleSignalNo),
+               "Invalid value for signal handler option: 'on'");
 }
 
 TEST(SanitizerCommon, IntFlags) {
Index: compiler-rt/trunk/test/asan/TestCases/Posix/asan-sigbus.cpp
===================================================================
--- compiler-rt/trunk/test/asan/TestCases/Posix/asan-sigbus.cpp
+++ compiler-rt/trunk/test/asan/TestCases/Posix/asan-sigbus.cpp
@@ -2,7 +2,7 @@
 // Defaults to true
 // RUN: %clangxx_asan -std=c++11 %s -o %t
 // RUN: not %run %t %T/file 2>&1 | FileCheck %s -check-prefix=CHECK-BUS
-// RUN: %env_asan_opts=handle_sigbus=false not --crash %run %t %T/file 2>&1 | FileCheck %s
+// RUN: %env_asan_opts=handle_sigbus=0 not --crash %run %t %T/file 2>&1 | FileCheck %s
 
 // UNSUPPORTED: ios