Re: [HACKERS] "24" < INT_MIN returns TRUE ???

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От Bruce Momjian
Тема Re: [HACKERS] "24" < INT_MIN returns TRUE ???
Дата
Msg-id 199907090401.AAA07699@candle.pha.pa.us
обсуждение исходный текст
Ответ на "24" < INT_MIN returns TRUE ???  (wieck@debis.com (Jan Wieck))
Ответы Re: [HACKERS] "24" < INT_MIN returns TRUE ???  (Tom Lane <tgl@sss.pgh.pa.us>)
Список pgsql-hackers
> Hi,
> 
>     did     anyone     compile     latest    CVS    with    v1.31
>     utils/adt/numutils.c?
> 
>     Marc activated some range checks in pg_atoi() and now I  have
>     a very interesting behaviour on a Linux box running gcc 2.8.1
>     glibc-2.
> 
>     Inside of pg_atoi(), the value is read into a long. Comparing
>     a  small positive long like 24 against INT_MIN returns TRUE -
>     dunno how.  Putting INT_MIN into another  long  variable  and
>     comparing  the  two  returns  the  expected FALSE - so what's
>     going on here? long, int32 and int have all 4 bytes here.

I just reversed out the patch.  It was causing initdb to fail!

I don't understand why it fails either, but have sent the report back to
the patch author.

I would love to hear the answer on this one.

--  Bruce Momjian                        |  http://www.op.net/~candle maillist@candle.pha.pa.us            |  (610)
853-3000+  If your life is a hard drive,     |  830 Blythe Avenue +  Christ can be your backup.        |  Drexel Hill,
Pennsylvania19026
 


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