[Bug tree-optimization/72787] Query related to gcc-4_6-branch fix for Bug-49279 (Getting issue with __restrict type qualifier)

[rguenther at suse dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72787

--- Comment #7 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 4 Aug 2016, ranjan.winner at gmail dot com wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72787
> 
> --- Comment #6 from martin <ranjan.winner at gmail dot com> ---
> (In reply to Richard Biener from comment #1)
> > You can't rely on __builtin_object_size this way, please look up its
> > documentation.
> 
> Hi Richard,
> 
>   Are you pointing to this line of test-case :
> 
>         size_t _sz = __builtin_object_size(dst, 1); 
> 
>  That we can't rely on __builtin_object_size this way.
>  I am getting wrong size only if I use __restrict qualifier, otherwise it
> calculate correct size.
> 
>  Also if we directly print the value of "__builtin_object_size(dst, 1)", then I
> am getting correct size.

You are always getting a conservative size.  Note that GCC 4.6 is no
longer maintained so this but is pointless.