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Re: gcc bug WRT warning that should not be displayed

From: Jim Wilson <wilson at specifix dot com>
To: Mo DeJong <mo at modejong dot com>
Cc: gcc-bugs at gcc dot gnu dot org
Date: Mon, 19 Mar 2007 12:56:30 -0700
Subject: Re: gcc bug WRT warning that should not be displayed
References: <45F9E700.3030904@modejong.com>

Mo DeJong wrote:

   long val2 = 1; /* incorrect warn when val2 is a long */
   int c2 = (
         ((long long) val2) <
         ((long long)(-2147483647L - 1))
        );

The result of the compare will always be false, so the warning is correct.

The long variable val2 can not hold a value smaller than LONG_MIN. Adding casts to long long does not change this fact. -- Jim Wilson, GNU Tools Support, http://www.specifix.com

References:
- gcc bug WRT warning that should not be displayed
  - From: Mo DeJong

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