Control profiling/debugger support from build script

SConstruct

Index: SConstruct
===================================================================
--- SConstruct	(revision 2873)
+++ SConstruct	(working copy)
@@ -96,13 +96,18 @@
 
 LIBRARY_FLAGS = {
   'all': {
-    'CPPDEFINES':   ['ENABLE_LOGGING_AND_PROFILING'],
     'CPPPATH': [join(root_dir, 'src')],
     'regexp:native': {
         'CPPDEFINES': ['V8_NATIVE_REGEXP']
     },
     'mode:debug': {
       'CPPDEFINES': ['V8_ENABLE_CHECKS']
+    },
+    'profilingsupport:on': {
+      'CPPDEFINES':   ['ENABLE_LOGGING_AND_PROFILING'],
+    },
+    'debuggersupport:on': {
+      'CPPDEFINES':   ['ENABLE_DEBUGGER_SUPPORT'],
     }
   },
   'gcc': {
@@ -114,7 +119,6 @@
       'CCFLAGS':      ['-g', '-O0'],
       'CPPDEFINES':   ['ENABLE_DISASSEMBLER', 'DEBUG'],
       'os:android': {
-        'CPPDEFINES': ['ENABLE_DEBUGGER_SUPPORT'],
         'CCFLAGS':    ['-mthumb']
       }
     },
@@ -123,7 +127,7 @@
                        '-ffunction-sections'],
       'os:android': {
         'CCFLAGS':    ['-mthumb', '-Os'],
-        'CPPDEFINES': ['SK_RELEASE', 'NDEBUG', 'ENABLE_DEBUGGER_SUPPORT']
+        'CPPDEFINES': ['SK_RELEASE', 'NDEBUG']
       }
     },
     'os:linux': {
@@ -576,6 +580,16 @@
     'default': 'static',
     'help': 'the type of library to produce'
   },
+  'profilingsupport': {
+    'values': ['on', 'off'],
+    'default': 'on',
+    'help': 'enable profiling of JavaScript code'
+  },
+  'debuggersupport': {
+    'values': ['on', 'off'],
+    'default': 'on',
+    'help': 'enable debugging of JavaScript code'
+  },
   'soname': {
     'values': ['on', 'off'],
     'default': 'off',
@@ -794,6 +808,10 @@
       # Print a warning if arch has explicitly been set
       print "Warning: forcing architecture to match simulator (%s)" % options['simulator']
     options['arch'] = options['simulator']
+  if (options['prof'] != 'off') and (options['profilingsupport'] == 'off'):
+    # Print a warning if profiling is enabled without profiling support
+    print "Warning: forcing profilingsupport on when prof is on"
+    options['profilingsupport'] = 'on'
 
 
 def ParseEnvOverrides(arg, imports):