optimization of kernel compilation

   If do not set -O2 to kernel compile option , I will get somw error aue to several symboles 
   is undefined reference to  ,for example:

             in ext3/super.c :  undefined reference to `ntohl'

   I take a lppk at the definition in source code for ntohl, it seems affected 
   by the __OPTIMIZE__ macro , which make this symbole defined as a macro .just
   like this : #define ntohl(x) ___ntohl(x)

   
   But if I do not define __OPTIMIZE__ ,which means I need not any optimization, 
   How can I compile successfully? Is there the corresponding ntohl() function in kernel ?
   I kave not found that yet. Does this mean I must use __OPTIMIZE__ by -O2 ?


   thanks!
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