Index: compiler-rt/trunk/cmake/Modules/CompilerRTUtils.cmake
===================================================================
--- compiler-rt/trunk/cmake/Modules/CompilerRTUtils.cmake
+++ compiler-rt/trunk/cmake/Modules/CompilerRTUtils.cmake
@@ -45,9 +45,14 @@
   endif()
 endmacro()
 
-macro(append_no_rtti_flag list)
-  append_list_if(COMPILER_RT_HAS_FNO_RTTI_FLAG -fno-rtti ${list})
-  append_list_if(COMPILER_RT_HAS_GR_FLAG /GR- ${list})
+macro(append_rtti_flag polarity list)
+  if(polarity)
+    append_list_if(COMPILER_RT_HAS_FRTTI_FLAG -frtti ${list})
+    append_list_if(COMPILER_RT_HAS_GR_FLAG /GR ${list})
+  else()
+    append_list_if(COMPILER_RT_HAS_FNO_RTTI_FLAG -fno-rtti ${list})
+    append_list_if(COMPILER_RT_HAS_GR_FLAG /GR- ${list})
+  endif()
 endmacro()
 
 macro(append_have_file_definition filename varname list)
Index: compiler-rt/trunk/cmake/config-ix.cmake
===================================================================
--- compiler-rt/trunk/cmake/config-ix.cmake
+++ compiler-rt/trunk/cmake/config-ix.cmake
@@ -21,6 +21,7 @@
 check_cxx_compiler_flag(-fno-stack-protector COMPILER_RT_HAS_FNO_STACK_PROTECTOR_FLAG)
 check_cxx_compiler_flag(-fno-sanitize=safe-stack COMPILER_RT_HAS_FNO_SANITIZE_SAFE_STACK_FLAG)
 check_cxx_compiler_flag(-fvisibility=hidden  COMPILER_RT_HAS_FVISIBILITY_HIDDEN_FLAG)
+check_cxx_compiler_flag(-frtti               COMPILER_RT_HAS_FRTTI_FLAG)
 check_cxx_compiler_flag(-fno-rtti            COMPILER_RT_HAS_FNO_RTTI_FLAG)
 check_cxx_compiler_flag(-ffreestanding       COMPILER_RT_HAS_FFREESTANDING_FLAG)
 check_cxx_compiler_flag("-Werror -fno-function-sections" COMPILER_RT_HAS_FNO_FUNCTION_SECTIONS_FLAG)
Index: compiler-rt/trunk/lib/asan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/asan/CMakeLists.txt
+++ compiler-rt/trunk/lib/asan/CMakeLists.txt
@@ -32,7 +32,7 @@
 include_directories(..)
 
 set(ASAN_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(ASAN_CFLAGS)
+append_rtti_flag(OFF ASAN_CFLAGS)
 
 set(ASAN_COMMON_DEFINITIONS
   ASAN_HAS_EXCEPTIONS=1)
Index: compiler-rt/trunk/lib/dfsan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/dfsan/CMakeLists.txt
+++ compiler-rt/trunk/lib/dfsan/CMakeLists.txt
@@ -6,7 +6,7 @@
   dfsan_custom.cc
   dfsan_interceptors.cc)
 set(DFSAN_COMMON_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(DFSAN_COMMON_CFLAGS)
+append_rtti_flag(OFF DFSAN_COMMON_CFLAGS)
 # Prevent clang from generating libc calls.
 append_list_if(COMPILER_RT_HAS_FFREESTANDING_FLAG -ffreestanding DFSAN_COMMON_CFLAGS)
 
Index: compiler-rt/trunk/lib/interception/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/interception/CMakeLists.txt
+++ compiler-rt/trunk/lib/interception/CMakeLists.txt
@@ -10,7 +10,7 @@
 include_directories(..)
 
 set(INTERCEPTION_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(INTERCEPTION_CFLAGS)
+append_rtti_flag(OFF INTERCEPTION_CFLAGS)
 
 add_compiler_rt_object_libraries(RTInterception
     OS ${SANITIZER_COMMON_SUPPORTED_OS}
Index: compiler-rt/trunk/lib/lsan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/lsan/CMakeLists.txt
+++ compiler-rt/trunk/lib/lsan/CMakeLists.txt
@@ -1,7 +1,7 @@
 include_directories(..)
 
 set(LSAN_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(LSAN_CFLAGS)
+append_rtti_flag(OFF LSAN_CFLAGS)
 
 set(LSAN_COMMON_SOURCES
   lsan_common.cc
Index: compiler-rt/trunk/lib/msan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/msan/CMakeLists.txt
+++ compiler-rt/trunk/lib/msan/CMakeLists.txt
@@ -17,7 +17,7 @@
 
 
 set(MSAN_RTL_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(MSAN_RTL_CFLAGS)
+append_rtti_flag(OFF MSAN_RTL_CFLAGS)
 append_list_if(COMPILER_RT_HAS_FPIE_FLAG -fPIE MSAN_RTL_CFLAGS)
 # Prevent clang from generating libc calls.
 append_list_if(COMPILER_RT_HAS_FFREESTANDING_FLAG -ffreestanding MSAN_RTL_CFLAGS)
Index: compiler-rt/trunk/lib/sanitizer_common/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/CMakeLists.txt
+++ compiler-rt/trunk/lib/sanitizer_common/CMakeLists.txt
@@ -122,7 +122,7 @@
 append_have_file_definition(tirpc/rpc/xdr.h HAVE_TIRPC_RPC_XDR_H SANITIZER_COMMON_DEFINITIONS)
 
 set(SANITIZER_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(SANITIZER_CFLAGS)
+append_rtti_flag(OFF SANITIZER_CFLAGS)
 
 append_list_if(SANITIZER_LIMIT_FRAME_SIZE -Wframe-larger-than=570
                SANITIZER_CFLAGS)
Index: compiler-rt/trunk/lib/tsan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/tsan/CMakeLists.txt
+++ compiler-rt/trunk/lib/tsan/CMakeLists.txt
@@ -6,7 +6,7 @@
 # SANITIZER_COMMON_CFLAGS contains -fPIC, but it's performance-critical for
 # TSan runtime to be built with -fPIE to reduce the number of register spills.
 append_list_if(COMPILER_RT_HAS_FPIE_FLAG -fPIE TSAN_CFLAGS)
-append_no_rtti_flag(TSAN_CFLAGS)
+append_rtti_flag(OFF TSAN_CFLAGS)
 
 if(COMPILER_RT_TSAN_DEBUG_OUTPUT)
   # Add extra debug information to TSan runtime. This configuration is rarely
Index: compiler-rt/trunk/lib/tsan/dd/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/tsan/dd/CMakeLists.txt
+++ compiler-rt/trunk/lib/tsan/dd/CMakeLists.txt
@@ -3,7 +3,7 @@
 include_directories(../..)
 
 set(DD_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(DD_CFLAGS)
+append_rtti_flag(OFF DD_CFLAGS)
 
 set(DD_SOURCES
   dd_rtl.cc
Index: compiler-rt/trunk/lib/ubsan/CMakeLists.txt
===================================================================
--- compiler-rt/trunk/lib/ubsan/CMakeLists.txt
+++ compiler-rt/trunk/lib/ubsan/CMakeLists.txt
@@ -22,18 +22,16 @@
 include_directories(..)
 
 set(UBSAN_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(UBSAN_CFLAGS)
+append_rtti_flag(OFF UBSAN_CFLAGS)
 append_list_if(SANITIZER_CAN_USE_CXXABI -DUBSAN_CAN_USE_CXXABI UBSAN_CFLAGS)
 
 set(UBSAN_STANDALONE_CFLAGS ${SANITIZER_COMMON_CFLAGS})
-append_no_rtti_flag(UBSAN_STANDALONE_CFLAGS)
+append_rtti_flag(OFF UBSAN_STANDALONE_CFLAGS)
 append_list_if(SANITIZER_CAN_USE_CXXABI -DUBSAN_CAN_USE_CXXABI UBSAN_STANDALONE_CFLAGS)
 
 set(UBSAN_CXXFLAGS ${SANITIZER_COMMON_CFLAGS})
+append_rtti_flag(ON UBSAN_STANDALONE_CXXFLAGS)
 append_list_if(SANITIZER_CAN_USE_CXXABI -DUBSAN_CAN_USE_CXXABI UBSAN_CXXFLAGS)
-# Make sure we end with -frtti on type_hash
-set_property(SOURCE ubsan_type_hash_itanium.cc APPEND_STRING PROPERTY
-  COMPILE_FLAGS " -frtti")
 
 add_custom_target(ubsan)