RFA (libstdc++): PATCH to implement C++17 over-aligned new

[Jonathan Wakely]

On 16/09/16 09:04 +0200, Rainer Orth wrote:
>Hi Jason,
>
>> OK, one more:
>
>this works just fine on both sparc-sun-solaris2.12 and
>i386-pc-solaris2.12.
>
>Once Jonathan's patch to heed aligned_alloc's requirement on size being
>a multiple of alignment is in, all is fine on Solaris.

I've got a slightly different fix now.

We only need to make the size a multiple of alignment for
aligned_alloc, however for posix_memalign we need to ensure the
alignment is a multiple of sizeof(void*).

I'm testing this now (but only on x86_64 GNU/Linux where it wasn't
failing anyway).

Would using __builtin_expect (sz == 0, false) make sense?  Surely it's
rare to try to allocate zero bytes.

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