[PATCH] glibc __builtin_add_overflow problem with GCC < 7

[Florian Weimer]

* Stefan Liebler via Libc-alpha:

> On s390x perspective, I'm fine with requiring GCC 7.1.
> For all other platforms, can somebody else (perhaps Joseph Myers) please
> comment on requiring GCC 7.1 instead of GCC 6.2 and/or rejecting ICC?

I do not have any concerns about requiring GCC 7 everywhere.  It's fine
for Fedora and Red Hat Enterprise Linux.

I don't think the difference matters for Ubuntu users, either.  16.04
LTS has GCC 5.3, so it's already too old.  18.04 TLS has GCC 7.3 or
later, so it aligns with the new requirement.

ICC does not matter for the glibc side because the code is internal to
glibc, and ICC cannot be used to build glibc anyway.

Thanks,
Florian
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