[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 18 matching lines @@
 
 {
   # 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',
     'make_clang_dir%': '../third_party/llvm-build/Release+Asserts',
     'clang_xcode%': 0,
     'asan%': 0,
+    'msan%': 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,
     'tsan%': 0,
     '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',
     'variables': {
       'variables': {
         'variables': {
@@ skipping 145 matching lines @@
               'VCCLCompilerTool': {
                 'WarnAsError': 'false',
               },
             },
           }],
         ],
       }],
     ],
   },
   'conditions': [
-    ['asan==1', {
+    ['asan==1 or msan==1 or tsan==1', {
       'target_defaults': {
         'cflags_cc+': [
           '-fno-omit-frame-pointer',
           '-gline-tables-only',
-          '-fsanitize=address',
-          '-w',  # http://crbug.com/162783
         ],
         'cflags_cc!': [
           '-fomit-frame-pointer',
         ],
         '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',

[earthdok, 2014/12/19 15:54:02]

this should be in "ldflags!", not "ldflags"

+        ],
+        '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)/third_party/libc++/libc++.gyp:libcxx_proxy',
+        ],
+      },
+    }],
+    ['asan==1', {
+      'target_defaults': {
+        'cflags_cc+': [
+          '-fsanitize=address',
+        ],
+        'ldflags': [
           '-fsanitize=address',
         ],
       },
     }],
+    ['msan==1', {
+      'target_defaults': {
+        'cflags_cc+': [
+          '-fsanitize=memory',
+          '-fsanitize-memory-track-origins=<(msan_track_origins)',
+        ],
+        'ldflags': [
+          '-fsanitize=memory',
+        ],
+        'defines': [
+          'MEMORY_SANITIZER',
+        ],
+      },
+    }],
     ['tsan==1', {
       'target_defaults': {
         'cflags+': [
-          '-fno-omit-frame-pointer',
-          '-gline-tables-only',
           '-fsanitize=thread',
           '-fPIC',
           '-Wno-c++11-extensions',
         ],
-        'cflags!': [
-          '-fomit-frame-pointer',
-        ],
         'ldflags': [
           '-fsanitize=thread',
           '-pie',
         ],
         'defines': [
           'THREAD_SANITIZER',
         ],
       },
     }],
     ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
@@ skipping 209 matching lines @@
       ],
     }],
     ['clang==1 and OS=="win"', {
       'make_global_settings': [
         # On Windows, gyp's ninja generator only looks at CC.
         ['CC', '<(make_clang_dir)/bin/clang-cl'],
       ],
     }],
   ],
 }