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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Tue, 4 May 2021 16:18:41 +0300
Message-ID: <CAHp75VevBN1AKpZetMfY7tUU0ghjc7_g7Vw=+rPxTfdifqqhFw@mail.gmail.com>
Subject: Re: [PATCH] Raise the minimum GCC version to 5.2
To:     Christophe Leroy <christophe.leroy@csgroup.eu>
Cc:     Masahiro Yamada <masahiroy@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Arnd Bergmann <arnd@arndb.de>,
        Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Linux Documentation List <linux-doc@vger.kernel.org>,
        "open list:LINUX FOR POWERPC PA SEMI PWRFICIENT" 
        <linuxppc-dev@lists.ozlabs.org>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Miguel Ojeda <ojeda@kernel.org>,
        Paul Mackerras <paulus@samba.org>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        Will Deacon <will@kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>
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On Mon, May 3, 2021 at 9:17 AM Christophe Leroy
<christophe.leroy@csgroup.eu> wrote:
> Le 01/05/2021 =C3=A0 17:15, Masahiro Yamada a =C3=A9crit :
> > The current minimum GCC version is 4.9 except ARCH=3Darm64 requiring
> > GCC 5.1.
> >
> > When we discussed last time, we agreed to raise the minimum GCC version
> > to 5.1 globally. [1]
> >
> > I'd like to propose GCC 5.2 to clean up arch/powerpc/Kconfig as well.
>
> One point I missed when I saw your patch first time, but I realised durin=
g the discussion:
>
> Up to 4.9, GCC was numbered with 3 digits, we had 4.8.0, 4.8.1, ... 4.8.5=
, 4.9.0, 4.9.1, .... 4.9.4
>
> Then starting at 5, GCC switched to a 2 digits scheme, with 5.0, 5.1, 5.2=
, ... 5.5
>
> So, that is not GCC 5.1 or 5.2 that you should target, but only GCC 5.
> Then it is up to the user to use the latest available version of GCC 5, w=
hich is 5.5 at the time
> begin, just like the user would have selected 4.9.4 when 4.9 was the mini=
mum GCC version.

And we may end up in the case when gcc 5.x will be more buggy than
v4.9.y (as once proved by nice detective story where compiler bug
produces a file system corruption).

--=20
With Best Regards,
Andy Shevchenko