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Re: Is this a gcc bug?

To: Uros Bizjak <uros at kss-loka dot si>
Subject: Re: Is this a gcc bug?
From: Alexandre Oliva <aoliva at redhat dot com>
Date: 11 Jan 2001 09:04:19 -0200
Cc: gcc at gcc dot gnu dot org
Organization: GCC Team, Red Hat
References: <Pine.LNX.4.05.10101111102230.14304-100000@pulsar.kss-loka.si>

On Jan 11, 2001, Uros Bizjak <uros@kss-loka.si> wrote:

>         printf ("%i, %i, %i, %i\n", x,  x += y, x += 2, x += z); 

>   It displays "22, 5, 7, 22".
>   I would expect the result to be "0, 5, 7, 22".

Undefined behavior.  A variable is modified more than once without
intervening sequence points.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
Free Software Evangelist    *Please* write to mailing lists, not to me

References:
- Is this a gcc bug?
  - From: Uros Bizjak

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