Fix linking of mksnapshot

Changelist http://codereview.chromium.org/20177 caused linking of mksnapshot to fail as link libraries where not specified. Updated build to link mksnapshot with pthread on Linux and Mac OS and with winmm on Windows.
Review URL: http://codereview.chromium.org/21171

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1241 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

SConstruct

@@ -144,6 +144,29 @@ V8_EXTRA_FLAGS = {
 }
 
 
+MKSNAPSHOT_EXTRA_FLAGS = {
+  'gcc': {
+    'os:linux': {
+      'LIBS': ['pthread'],
+    },
+    'os:macos': {
+      'LIBS': ['pthread'],
+    },
+    'os:freebsd': {
+      'LIBS': ['pthread'],
+    },
+    'os:win32': {
+      'LIBS': ['winmm'],
+    },
+  },
+  'msvc': {
+    'all': {
+      'LIBS': ['winmm']
+    }
+  }
+}
+
+
 JSCRE_EXTRA_FLAGS = {
   'gcc': {
     'all': {
@@ -540,6 +563,7 @@ def BuildSpecific(env, mode, env_overrides):
 
   library_flags = context.AddRelevantFlags(os.environ, LIBRARY_FLAGS)
   v8_flags = context.AddRelevantFlags(library_flags, V8_EXTRA_FLAGS)
+  mksnapshot_flags = context.AddRelevantFlags(library_flags, MKSNAPSHOT_EXTRA_FLAGS)
   jscre_flags = context.AddRelevantFlags(library_flags, JSCRE_EXTRA_FLAGS)
   dtoa_flags = context.AddRelevantFlags(library_flags, DTOA_EXTRA_FLAGS)
   cctest_flags = context.AddRelevantFlags(v8_flags, CCTEST_EXTRA_FLAGS)
@@ -548,7 +572,7 @@ def BuildSpecific(env, mode, env_overrides):
 
   context.flags = {
     'v8': v8_flags,
-    'mksnapshot': v8_flags,
+    'mksnapshot': mksnapshot_flags,
     'jscre': jscre_flags,
     'dtoa': dtoa_flags,
     'cctest': cctest_flags,

src/SConscript

@@ -150,8 +150,10 @@ def ConfigureObjectFiles():
 
   # Create snapshot if necessary.
   empty_snapshot_obj = context.ConfigureObject(env, 'snapshot-empty.cc')
+  mksnapshot_env = env.Copy()
+  mksnapshot_env.Replace(**context.flags['mksnapshot'])
   mksnapshot_src = 'mksnapshot.cc'
-  mksnapshot = env.Program('mksnapshot', [mksnapshot_src, libraries_obj, non_snapshot_files, empty_snapshot_obj], PDB='mksnapshot.exe.pdb')
+  mksnapshot = mksnapshot_env.Program('mksnapshot', [mksnapshot_src, libraries_obj, non_snapshot_files, empty_snapshot_obj], PDB='mksnapshot.exe.pdb')
   if context.use_snapshot:
     if context.build_snapshot:
       snapshot_cc = env.Snapshot('snapshot.cc', mksnapshot, LOGFILE=File('snapshot.log').abspath)