Use a fixed random seed per default.

To get back the old behavior, use "make randomseed=0 ...".

BUG=v8:1880,v8:2885
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/64093003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17555 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

Makefile

@@ -104,6 +104,10 @@ endif
 ifeq ($(unalignedaccess), on)
   GYPFLAGS += -Dv8_can_use_unaligned_accesses=true
 endif
+# randomseed=12345, disable random seed via randomseed=0
+ifdef randomseed
+  GYPFLAGS += -Dv8_random_seed=$(randomseed)
+endif
 # soname_version=1.2.3
 ifdef soname_version
   GYPFLAGS += -Dsoname_version=$(soname_version)

tools/gyp/v8.gyp

@@ -28,6 +28,7 @@
 {
   'variables': {
     'v8_code': 1,
+    'v8_random_seed%': 314159265,
   },
   'includes': ['../../build/toolchain.gypi', '../../build/features.gypi'],
   'targets': [
@@ -156,6 +157,11 @@
               '--log-snapshot-positions',
               '--logfile', '<(INTERMEDIATE_DIR)/snapshot.log',
             ],
+            'conditions': [
+              ['v8_random_seed!=0', {
+                'mksnapshot_flags': ['--random-seed', '<(v8_random_seed)'],
+              }],
+            ],
           },
           'action': [
             '<@(_inputs)',