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RE: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug.
From: |
Larry Barello |
Subject: |
RE: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug. |
Date: |
Mon, 9 May 2005 08:21:12 -0700 |
So, this is all facinating reading, but what, if anything, is a NULL pointer
in the AVR context? Address 0 is certainly valid. Or is it simply
convention that 0 is "null".
I didn't understand everything that was said, but it seemed clear to me that
having the construct
char *foo;
if (foo && (*foo !=0))
randomly break seemed pretty harsh. Was (is) the solution to disable null
pointer checks? Do I need to add this to my makefile scripts? Is this a
lurking problem prior to the latest WinAVR release?
-----Original Message-----
From:
Russell Shaw wrote:
>
> Only in cases where the context may not indicate where a pointer value is
> required:
>
> http://www.eskimo.com/~scs/C-faq/q5.2.html
> http://www.eskimo.com/~scs/C-faq/q5.3.html
> http://www.eskimo.com/~scs/C-faq/s5.html
Thanks for the links, Russell. The first sentence in the first link:
"According to the language definition, a constant 0 in a pointer context
is converted into a null pointer at compile time."
I wasn't aware of this. Thanks for pointing it out. :-)
Eric
- [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., Joerg Wunsch, 2005/05/08
- [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., Vesa Jääskeläinen, 2005/05/08
- Re: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., E. Weddington, 2005/05/08
- Re: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., Russell Shaw, 2005/05/09
- Re: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., E. Weddington, 2005/05/09
- RE: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug.,
Larry Barello <=
- Re: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., E. Weddington, 2005/05/09
- Re: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., Jeff Epler, 2005/05/09
- Re: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., Vesa Jääskeläinen, 2005/05/09
- Re: [avr-gcc-list] Re: WinAVR 20050214 (gcc 3.4.3) and optimizer bug., Russell Shaw, 2005/05/09