Re: strict aliasing in gcc33

[Andrew Pinski]

On Apr 29, 2004, at 10:50, Pete French wrote:

> This isnt really GNustep,its more of an objective C question, but I am
> not sure where else to ask...
>
> I am moving  from gcc2.95 to gcc3.3 which I find is that if I compile
> any code with -O2 enabled then I get the following warning when I 
> invoke a
> method:
>
> bash-2.05b$ gcc33 -c -Wall -O2 stest.m
> stest.m: In function `main':
> stest.m:29: warning: dereferencing type-punned pointer will break 
> strict-aliasing rules
>
> I have completely  failed to find any way to code the file such that 
> it does
> not produce this warning. Obviously II can add the 
> '-fno-strict-aliasiing' to
> the cmmand line, but I do not belive that al Objectoive C needs this to
> compile without warning! Surely not!
>
> The piece of test code in question looks like this: (the error is
> on the '[TestObject new]' line)

Yes this is a semi known bug in the Objective-C front-end (I had forgot 
to
file a bug report for it though).

Thanks,
Andrew Pinski
libobjc maintainer