Re: [PATCH] intprops: add WRAPV and const flavors for GCC 5

[Paul Eggert]

On 12/17/2015 06:19 AM, Pádraig Brady wrote:
> -     long int result = INT_MULTIPLY_WRAPV (a, b);
> +     long int result = a * b;

This doesn't look right, because a * b could overflow which would lead 
to undefined behavior. INT_MULTIPLY_WRAPV does not rely on undefined 
behavior due to integer overflow, which is the point of that example.

I tracked this down to what appears to be a compiler bug in GCC, filed a 
bug report with the GCC folks (GCC bug 68971), and installed the 
attached patch instead.

0001-intprops-test-work-around-GCC-bug-68971.patch
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