[patch] libstdc++/66327 don't pass null pointers to memcmp

[Jonathan Wakely]

On 29/05/15 19:52 +0000, Jörg Richter wrote:
>Jonathan Wakely <jwakely <at> redhat.com> writes:
>
>> This is a rather brute force fix, but if noone has any better ideas
>> I'll commit this to the trunk and 4.9 and 5 branches tomorrow. (I
>> think it should go on the branches, because 4.9 is known to optimise
>> away null pointer checks after invalid calls to memcmp like this).
>
>How about comparing only the length against 0?
>The pointers must be != 0 if length > 0.

Like so? Yes, that's probably an improvement, because we need that
length anyway.

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