[Bug c/10947] ++ postfix operator increments too soon

["pinskia at physics dot uc dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10947



------- Additional Comments From pinskia@physics.uc.edu  2003-05-23 02:35 -------
Subject: Re: [Bug c/10947] New: ++ postfix operator increments too soon

This is a bug in your code, you are violating sequence point rules, you 
cannot access something that you increment.

Use the option -Wsequence-point for a warning about them.

   -Wsequence-point        Warn about possible violations of sequence 
point rules

you can do this instead:

{*s = toupper(*s); s++;}

Thanks,
Andrew Pinski

PS can someone close this bug.



> With the following line of code:
> *s++ = toupper(*s);
> The 3.2.2 gcc increments s before the value is determined on the right 
> side of
> the equal sign.  So what happens is *s gets the value of toupper(*s+1) 
> not
> toupper(*s)
> The bug did not occur in version 3.1.1 of gcc.  I have not run tests 
> on versions
> in-between these versions.  The gcc version 3.2.2 is the standard one 
> that is
> included in the Mandrake Linux 9.1 distribution.  If a known fix for 
> this is
> possible by recompiling gcc 3.2.2 or upgrading to a newer gcc please 
> let me know.





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