[test] Make msan work for v8 stand-alone.

build/standalone.gypi

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 17 matching lines @@
 # Definitions to be used when building stand-alone V8 binaries.
 
 {
   # We need to include toolchain.gypi here for third-party sources that don't
   # directly include it themselves.
   'includes': ['toolchain.gypi'],
   'variables': {
     'component%': 'static_library',
     'clang_dir%': 'third_party/llvm-build/Release+Asserts',
     'clang_xcode%': 0,
+    # Track where uninitialized memory originates from. From fastest to
+    # slowest: 0 - no tracking, 1 - track only the initial allocation site, 2
+    # - track the chain of stores leading from allocation site to use site.
+    'msan_track_origins%': 1,

[earthdok, 2015/05/05 14:40:47]

I suggest '2' here. The performance difference is small enough that we no longer
encourage the use of track_origins=1. We don't have any configurations in
Chromium that use it.

     'visibility%': 'hidden',
     'v8_enable_backtrace%': 0,
     'v8_enable_i18n_support%': 1,
     'v8_deprecation_warnings': 1,
     'msvs_multi_core_compile%': '1',
     'mac_deployment_target%': '10.5',
     'release_extra_cflags%': '',
     'variables': {
       'variables': {
         'variables': {
@@ skipping 260 matching lines @@
         ],
         'ldflags': [
           '-fsanitize=thread',
           '-pie',
         ],
         'defines': [
           'THREAD_SANITIZER',
         ],
       },
     }],
+    ['msan==1 and OS!="mac"', {
+      'target_defaults': {
+        'cflags_cc+': [
+          '-fno-omit-frame-pointer',
+          '-gline-tables-only',
+          '-fsanitize=memory',
+          '-fsanitize-memory-track-origins=<(msan_track_origins)',
+          '-fPIC',
+        ],
+        'cflags+': [

[Michael Achenbach, 2015/04/27 09:08:39]

Without the additional cflags -fPIC and the removal of -fno-exceptions we run
into compile errors in libc++ and libc++abi.

[earthdok, 2015/05/05 14:40:47]

This is very strange. -fPIC should be implied by -fsanitize=memory, and we
certainly don't need exceptions. Can you paste the errors you see? (or how to
reproduce this)

+          '-fPIC',
+        ],
+        'cflags!': [
+          '-fno-exceptions',
+          '-fomit-frame-pointer',
+        ],
+        'ldflags': [
+          '-fsanitize=memory',
+        ],
+        'defines': [
+          'MEMORY_SANITIZER',
+        ],
+        'dependencies': [
+          # Use libc++ (third_party/libc++ and third_party/libc++abi) instead of
+          # stdlibc++ as standard library. This is intended to use for instrumented
+          # builds.
+          '<(DEPTH)/buildtools/third_party/libc++/libc++.gyp:libcxx_proxy',
+        ],
+      },
+    }],
     ['asan==1 and OS=="mac"', {
       'target_defaults': {
         'xcode_settings': {
           'OTHER_CFLAGS+': [
             '-fno-omit-frame-pointer',
             '-gline-tables-only',
             '-fsanitize=address',
             '-w',  # http://crbug.com/162783
           ],
           'OTHER_CFLAGS!': [
@@ skipping 268 matching lines @@
     ['use_goma==1 and ("<(GENERATOR)"=="ninja" or clang==1)', {
       'make_global_settings': [
        ['CC_wrapper', '<(gomadir)/gomacc'],
        ['CXX_wrapper', '<(gomadir)/gomacc'],
        ['CC.host_wrapper', '<(gomadir)/gomacc'],
        ['CXX.host_wrapper', '<(gomadir)/gomacc'],
       ],
     }],
   ],
 }