linux-kernel - Re: [PATCH] Raise the minimum GCC version to 5.2

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Message-ID: <20210502223007.GZ1847222@casper.infradead.org>
Date:   Sun, 2 May 2021 23:30:07 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Segher Boessenkool <segher@...nel.crashing.org>,
        Joe Perches <joe@...ches.com>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Paul Mackerras <paulus@...ba.org>,
        linux-riscv@...ts.infradead.org,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Will Deacon <will@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] Raise the minimum GCC version to 5.2

On Sun, May 02, 2021 at 02:08:31PM -0700, Linus Torvalds wrote:
> What is relevant is what version of gcc various distributions actually
> have reasonably easily available, and how old and relevant the
> distributions are. We did decide that (just as an example) RHEL 7 was
> too old to worry about when we updated the gcc version requirement
> last time.
> 
> Last year, Arnd and Kirill (maybe others were involved too) made a
> list of distros and older gcc versions. But I don't think anybody
> actually _maintains_ such a list. It would be perhaps interesting to
> have some way to check what compiler versions are being offered by
> different distros.

fwiw, Debian 9 aka Stretch released June 2017 had gcc 6.3
Debian 10 aka Buster released June 2019 had gcc 7.4 *and* 8.3.
Debian 8 aka Jessie had gcc-4.8.4 and gcc-4.9.2.

So do we care about people who haven't bothered to upgrade userspace
since 2017?  If so, we can't go past 4.9.