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Re: FYI: s390x: Require GCC 7.1 or later to build glibc due to __builtin
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From: |
Bruno Haible |
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Subject: |
Re: FYI: s390x: Require GCC 7.1 or later to build glibc due to __builtin_add_overflow |
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Date: |
Fri, 18 Dec 2020 19:32:42 +0100 |
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User-agent: |
KMail/5.1.3 (Linux/4.4.0-197-generic; KDE/5.18.0; x86_64; ; ) |
Paul Eggert wrote:
> > Thanks for the heads-up. Indeed, what I understand from this bug report is
> > that
> > the condition code handling (required by __builtin_add_overflow on many
> > platforms) was unreliable before 2017-01-27, i.e. in GCC versions < 7.
> > So, gnulib shouldn't make use of it in these GCC versions.
>
> So the problem is on all platforms, not just s390x?
That's my understanding, from the cited
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98269>.
Even if I'm wrong, given that GCC 5 and 6 are in decreasing use, I feel it's
better to err on the safe side.
Bruno