Re: Mysterious warning
Re: Mysterious warning
- Subject: Re: Mysterious warning
- From: "Chris Suter" <email@hidden>
- Date: Thu, 13 Nov 2008 09:38:08 +1100
On Wed, Nov 12, 2008 at 10:20 PM, Graham Cox <email@hidden> wrote:
> I just added some fairly old C++ lex/bison code to my app, code that has
> been in use for a long time elsewhere and works fine. My app is compiling
> with much stricter warnings than many of my other projects though, and this
> line is throwing a warning:
>
>
> lvalp->val = strtod( --wptr, &wptr );
>
> "warning: operation on 'wptr' may be undefined"
>
> wptr is declared:
>
> static char* wptr = NULL;
>
> Can anyone shed any light on what's wrong here? Hopefully the above is
> enough to go on.
The order of evaluation of the arguments to a function is undefined so
you have a problem where you're taking the address of wptr and you're
pre-decrementing it.
-- Chris
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden