Re: GCC not doing the correct thing?

FROM : Clark S. Cox III
DATE : Mon Nov 11 15:46:31 2002

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On Monday, Nov 11, 2002, at 07:21 US/Eastern, Thomas Castiglione wrote:

> I couldn't agree more. The GOOD news is that that code works perfectly
> in GCC, for me at least. Simple test case, using your example:
>
>
> #define CUBE(A)      ((A) * (A) * (A))
> main() {
>        char *a = "ABCD";
>        printf("%s\n", a);
>        cube(*a++);
>        printf("%s\n", a);
> }

   I promise you, you are asking for trouble. There is no guarantee that
this behavior will not change (i.e. in a new compiler version, on a new
processor, etc.), because this behavior is undefined according to the C
standard (i.e. the compiler is free to do ANYTHING). You are making
unwarranted assumptions about the language; yes, they are logical
assumptions, and it "feels" right that this should work, but it doesn't.

- --
http://homepage.mac.com/clarkcox3/
<email_removed>
Clark S. Cox, III
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