Add msan build option.

Currently works only in combination with i18nsupport=off.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/367623002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22109 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Makefile

@@ -145,7 +145,13 @@ ifneq ($(strip $(asan)),)
   export LINK=$(asan)
   export ASAN_SYMBOLIZER_PATH="$(dir $(asan))llvm-symbolizer"
 endif
-
+# msan=/path/to/clang++
+ifneq ($(strip $(msan)),)
+  GYPFLAGS += -Dmsan=1 -Dmsan_track_origins=2
+  export CXX=$(msan)
+  export CXX_host=$(msan)
+  export LINK=$(msan)
+endif
 # arm specific flags.
 # arm_version=<number | "default">
 ifneq ($(strip $(arm_version)),)

build/standalone.gypi

@@ -35,6 +35,7 @@
     'component%': 'static_library',
     'clang%': 0,
     'asan%': 0,
+    'msan%': 0,
     'visibility%': 'hidden',
     'v8_enable_backtrace%': 0,
     'v8_enable_i18n_support%': 1,
@@ -185,6 +186,22 @@
         ],
       },
     }],
+    ['msan==1', {
+      'target_defaults': {
+        'cflags_cc+': [
+          '-fno-omit-frame-pointer',
+          '-fsanitize-memory-track-origins=2',
+          '-fsanitize=memory',
+          '-w',  # http://crbug.com/162783
+        ],
+        'cflags_cc!': [
+          '-fomit-frame-pointer',
+        ],
+        'ldflags': [
+          '-fsanitize=memory',
+        ],
+      },
+    }],
     ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
        or OS=="netbsd"', {
       'target_defaults': {