How to force gcc warn the conditions which are true of false forever?

Pan ruochen
Tue Nov 4 11:37:00 GMT 2008

Hi All,

gcc (version 3.4.5) will optimize the following code without any
warnings even with -Wall options
if (id < 0 && id > 3)
          return ;
How should I do if I do want gcc to give warnings about these code,
since in most cases
such code are really mistakes?

Best Regards
Nov 4, 2008

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