extconf.rb in swift-0.4.3

- old
+ new

@@ -2,10 +2,10 @@
 require 'mkmf'
 
 Config::CONFIG['CC']  = 'g++'
 Config::CONFIG['CPP'] = 'g++'
 
-$CFLAGS  = '-fPIC -O3'
+$CFLAGS  = '-fPIC -Os'
 
 def apt_install_hint pkg
   "sudo apt-get install #{pkg}"
 end
 