On 23 Aug 2011, at 1:22am, Richard Hipp wrote:

> It appears that GCC 4.1.0 is not generating any code for the second test in
> the conditional.  In other words, GCC 4.1.0 is compiling that statement as
> if it omitted the "&& p->a" term

How interesting.  Can't solve your problem but pure curiosity on my part: is 
this a result of optimization ?  Would it be worth trying all the '-O' options, 
especially '-O0', in

<http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html>

Or would your observation be independent of any such settings ?

Given that the later version of GCC fixes the bug, I guess someone somewhere 
noticed the problem.

Simon.
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