On 10/31/2015 12:50, David Grayson wrote:
> As of a few days ago, clang supports the builtins we use in
> intsafe.h.  However, clang still defines __GNUC__ as 4 and I don't
> know how long it's going to be like that.  So this patch adds special
> code to detect clang and detect if clang supports the builtins we
> need, allowing the inline functions in intsafe.h to be used from
> clang.
> 
> I'm only checking __builtin_add_overflow and not
> __builtin_mul_overflow or __builting_sub_overflow because all three
> of those functions were added in one clang commit.
> 
> I tested this patch with GCC 5 in Windows.  I tested the new logic
> from the patch (but not the intsafe.h itself) with GCC 5 in Linux,
> and two different versions of clang in Linux, one that supports the
> new builtins and one that does not.
> 
> If someone could commit this, that would be great!  Thanks!
> 
> --David Grayson
> 

Looks good to me, if nobody objects, I will commit it soon.

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