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Re: 5.12: inplace sort <*> segfault (gcc 4.5.0 bug?)

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From:
Nicholas Clark
Date:
May 11, 2010 08:57
Subject:
Re: 5.12: inplace sort <*> segfault (gcc 4.5.0 bug?)
Message ID:
20100511155744.GK2576@plum.flirble.org
On Tue, May 11, 2010 at 11:53:14AM -0400, Eric Brine wrote:
> On Tue, May 11, 2010 at 11:38 AM, Nicholas Clark <nick@ccl4.org> wrote:
> 
> > > I suspect that the reader/rejector assumed that the indexes for notnull()
> > > start at 0. They start at 1. If you make that mistake, you would conclude
> > > (wrongly) what the rejector did.
> >
> > Gah. I think I'm wrong here. I'm not convinced that the test case is
> > correct.
> >
> 
> What you say matches the docs:
> 
> extern void *
>  my_memcpy (void *dest, const void *src, size_t len)
> __attribute__((nonnull (1, 2)));
> 
> causes the compiler to check that, in calls to my_memcpy, arguments dest and
> src are non-null.
> 
> so nonnull(2) would apply to o, the 2nd arg.

But the bug (in op.c) was when the final (3rd) argument oright was annotated
as non-null, but gcc was treating the 2nd argument, o, as non-null.

Nicholas Clark

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