[libfuzzer] tweaking is_ubsan_security options.

build/config/sanitizers/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 # Contains the dependencies needed for sanitizers to link into executables and
 # shared_libraries. Unconditionally depend upon this target as it is empty if
@@ skipping 73 matching lines @@
     }
     if (is_lsan) {
       ldflags += [ "-fsanitize=leak" ]
     }
     if (is_tsan) {
       ldflags += [ "-fsanitize=thread" ]
     }
     if (is_msan) {
       ldflags += [ "-fsanitize=memory" ]
     }
-    if (is_ubsan) {
+    if (is_ubsan || is_ubsan_security) {
       ldflags += [ "-fsanitize=undefined" ]
     }
     if (is_ubsan_vptr) {
       ldflags += [ "-fsanitize=vptr" ]
     }
     if (is_lto && !is_nacl) {
       ldflags += [ "-flto" ]
 
       # Apply a lower LTO optimization level as the default is too slow.
       if (is_linux) {
@@ skipping 217 matching lines @@
     sources = [
       "//third_party/llvm-build/Release+Asserts/compiler-rt/lib/darwin/libclang_rt.asan_osx_dynamic.dylib",
       "//third_party/llvm-build/Release+Asserts/compiler-rt/lib/darwin/libclang_rt.tsan_osx_dynamic.dylib",
       "//third_party/llvm-build/Release+Asserts/compiler-rt/lib/darwin/libclang_rt.ubsan_osx_dynamic.dylib",
     ]
     outputs = [
       "$root_build_dir/{{source_file_part}}",
     ]
   }
 }