Add preliminary support for UBSan in Chromium.

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 344 matching lines @@
 
       # Enable building with SyzyAsan.
       # See https://code.google.com/p/sawbuck/wiki/SyzyASanHowTo
       'syzyasan%': 0,
 
       # Enable building with LSan (Clang's -fsanitize=leak option).
       # -fsanitize=leak only works with clang, but lsan=1 implies clang=1
       # See https://sites.google.com/a/chromium.org/dev/developers/testing/leaksanitizer
       'lsan%': 0,
 
-      # Enable building with TSAN (Clang's -fsanitize=thread option).
+      # Enable building with TSan (Clang's -fsanitize=thread option).
       # -fsanitize=thread only works with clang, but tsan=1 implies clang=1
       # See http://clang.llvm.org/docs/ThreadSanitizer.html
       'tsan%': 0,
       'tsan_blacklist%': '<(PRODUCT_DIR)/../../tools/valgrind/tsan_v2/ignores.txt',
 
-      # Enable building with MSAN (Clang's -fsanitize=memory option).
+      # Enable building with MSan (Clang's -fsanitize=memory option).
       # MemorySanitizer only works with clang, but msan=1 implies clang=1
       # See http://clang.llvm.org/docs/MemorySanitizer.html
       'msan%': 0,
       'msan_blacklist%': '<(PRODUCT_DIR)/../../tools/msan/blacklist.txt',
 
+      # Enable building with UBSan (Clang's -fsanitize=undefined option).
+      # -fsanitize=undefined only works with clang, but ubsan=1 implies clang=1
+      # See http://clang.llvm.org/docs/UsersManual.html
+      'ubsan%': 0,
+
       # Use the dynamic libraries instrumented by one of the sanitizers
       # instead of the standard system libraries.
       'use_instrumented_libraries%': 0,
 
       # Use libc++ (third_party/libc++ and third_party/libc++abi) instead of
       # stdlibc++ as standard library. This is intended to use for instrumented
       # builds.
       'use_custom_libcxx%': 0,
 
       # Use a modified version of Clang to intercept allocated types and sizes
@@ skipping 648 matching lines @@
     'asan%': '<(asan)',
     'asan_coverage%': '<(asan_coverage)',
     'use_sanitizer_options%': '<(use_sanitizer_options)',
     'syzyasan%': '<(syzyasan)',
     'syzygy_optimize%': '<(syzygy_optimize)',
     'lsan%': '<(lsan)',
     'msan%': '<(msan)',
     'msan_blacklist%': '<(msan_blacklist)',
     'tsan%': '<(tsan)',
     'tsan_blacklist%': '<(tsan_blacklist)',
+    'ubsan%': '<(ubsan)',
     'use_instrumented_libraries%': '<(use_instrumented_libraries)',
     'use_custom_libcxx%': '<(use_custom_libcxx)',
     'clang_type_profiler%': '<(clang_type_profiler)',
     'order_profiling%': '<(order_profiling)',
     'order_text_section%': '<(order_text_section)',
     'enable_extensions%': '<(enable_extensions)',
     'enable_plugin_installation%': '<(enable_plugin_installation)',
     'enable_plugins%': '<(enable_plugins)',
     'enable_session_service%': '<(enable_session_service)',
     'enable_themes%': '<(enable_themes)',
@@ skipping 367 matching lines @@
         'syzygy_optimize%': 0,
       }],
       # Get binutils version so we can enable debug fission if we can.
       ['os_posix==1 and OS!="mac" and OS!="ios"', {
         'conditions': [
           # compiler_version doesn't work with clang
           # TODO(mithro): Land https://codereview.chromium.org/199793014/ so
           # compiler_version works with clang.
           # TODO(glider): set clang to 1 earlier for ASan and TSan builds so
           # that it takes effect here.
-          ['clang==0 and asan==0 and lsan==0 and tsan==0 and msan==0', {
+          ['clang==0 and asan==0 and lsan==0 and tsan==0 and msan==0 and ubsan==0', {
             'binutils_version%': '<!pymod_do_main(compiler_version target assembler)',
           }],
           # On Android we know the binutils version in the toolchain.
           ['OS=="android"', {
             'binutils_version%': 222,
           }],
           ['host_arch=="x64"', {
             'binutils_dir%': 'third_party/binutils/Linux_x64/Release/bin',
           }],
           ['host_arch=="ia32"', {
@@ skipping 568 matching lines @@
       ['clang_use_chrome_plugins==1 and OS!="win"', {
         'clang_chrome_plugins_flags': [
           '<!@(<(DEPTH)/tools/clang/scripts/plugin_flags.sh)'
         ],
       }],
 
       ['asan==1', {
         'clang%': 1,
         'use_allocator%': 'none',
       }],
+      ['ubsan==1', {
+        'clang%': 1,
+      }],
       ['asan==1 and OS=="mac"', {
         # TODO(glider): we do not strip ASan binaries until the dynamic ASan
         # runtime is fully adopted. See http://crbug.com/242503.
         'mac_strip_release': 0,
       }],
       ['lsan==1', {
         'clang%': 1,
       }],
       ['tsan==1', {
         'clang%': 1,
@@ skipping 1743 matching lines @@
             ],
           }],
           ['clang==1 and "<(GENERATOR)"=="ninja"', {
             'cflags': [
               # See http://crbug.com/110262
               '-fcolor-diagnostics',
             ],
           }],
           # Common options for AddressSanitizer, LeakSanitizer,
           # ThreadSanitizer and MemorySanitizer.
-          ['asan==1 or lsan==1 or tsan==1 or msan==1', {
+          ['asan==1 or lsan==1 or tsan==1 or msan==1 or ubsan==1', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
                   '-fno-omit-frame-pointer',
                   '-gline-tables-only',
                 ],
                 'cflags!': [
                   '-fomit-frame-pointer',
                 ],
+              }],
+            ],
+          }],
+          ['asan==1 or lsan==1 or tsan==1 or msan==1', {
+            'target_conditions': [
+              ['_toolset=="target"', {
                 'ldflags!': [
                   # Functions interposed by the sanitizers can make ld think
                   # that some libraries aren't needed when they actually are,
                   # http://crbug.com/234010. As workaround, disable --as-needed.
                   '-Wl,--as-needed',
                 ],
                 'defines': [
                   'MEMORY_TOOL_REPLACES_ALLOCATOR',
                 ],
               }],
@@ skipping 20 matching lines @@
               }],
             ],
             'conditions': [
               ['OS=="mac"', {
                 'cflags': [
                   '-mllvm -asan-globals=0',  # http://crbug.com/352073
                 ],
               }],
             ],
           }],
+          ['ubsan==1', {
+            'target_conditions': [
+              ['_toolset=="target"', {
+                'cflags': [
+                  '-fsanitize=undefined',
+                  # -fsanitize=vptr is incompatible with -fno-rtti.
+                  '-fno-sanitize=vptr',
+                  '-w',  # http://crbug.com/162783
+                ],
+                'ldflags': [
+                  '-fsanitize=undefined',
+                  # -fsanitize=vptr is incompatible with -fno-rtti.
+                  '-fno-sanitize=vptr',
+                ],
+              }],
+            ],
+          }],
           ['asan_coverage!=0', {
             'target_conditions': [
               ['_toolset=="target"', {
                 'cflags': [
                   '-mllvm -asan-coverage=<(asan_coverage)',
                 ],
               }],
             ],
           }],
           ['lsan==1', {
@@ skipping 1536 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }