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Re: Comparison of promoted ~unsigned
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Re: Comparison of promoted ~unsigned


  • Subject: Re: Comparison of promoted ~unsigned
  • From: Chris Suter <email@hidden>
  • Date: Wed, 7 Oct 2009 19:22:39 +1100

Hi Jonny,

On Wed, Oct 7, 2009 at 7:12 PM, Jonny Taylor <email@hidden> wrote:
> What compiler and version are you using? I don't see this extra
> warning on any of the compilers available to me.
>
> I see this with gcc 4.0 and 4.2, both tiger and snow leopard standard
> installs, when I enable -Wall (or -Wsign-compare). Are you saying you see
> neither error, or just the first (probably correct) one?

Just the first.

On SL:

# cat | gcc -c -W -Wall -x c -O3 -arch i386 -o /dev/null -
#include <stdlib.h>

int main (void)
{
  unsigned short a = 1;
  if (a < ~a)
    exit(0);
  if (a < (unsigned short)(~a))
    exit(0);

  return 0;
}
^D
<stdin>: In function ‘main’:
<stdin>:6: warning: comparison of promoted ~unsigned with unsigned

# gcc --version
i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5646)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Kind regards,

Chris
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  • Follow-Ups:
    • Re: Comparison of promoted ~unsigned
      • From: Jonny Taylor <email@hidden>
References: 
 >Comparison of promoted ~unsigned (From: Jonny Taylor <email@hidden>)
 >Re: Comparison of promoted ~unsigned (From: Chris Suter <email@hidden>)
 >Re: Comparison of promoted ~unsigned (From: Jonny Taylor <email@hidden>)

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