Added --profile option to config

wscript

@@ -1,4 +1,6 @@
+
 import glob
+import Options
 
 srcdir = '.'
 blddir = 'build'
@@ -6,13 +8,22 @@ VERSION = '0.0.1'
 
 def set_options(opt):
   opt.tool_options('compiler_cxx')
+  opt.add_option('--profile', action='store_true', help='Enable profiling', dest='profile', default=False)
 
 def configure(conf):
+  o = Options.options
+  conf.env['USE_PROFILING'] = o.profile
   conf.check_tool('compiler_cxx')
   conf.check_tool('node_addon')
   conf.env.append_value('CPPFLAGS', '-DNDEBUG')
+  
   if conf.check(lib='jpeg', uselib_store='JPEG', mandatory=False):
     conf.env.append_value('CPPFLAGS', '-DHAVE_JPEG=1')
+
+  if conf.env['USE_PROFILING'] == True:
+    conf.env.append_value('CXXFLAGS', ['-pg'])
+    conf.env.append_value('LINKFLAGS', ['-pg'])
+
   conf.check_cfg(package='cairo', args='--cflags --libs', mandatory=True)
   flags = ['-O3', '-Wall']
   conf.env.append_value('CCFLAGS', flags)