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

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Date:   Tue, 4 May 2021 11:13:01 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.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>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.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>,
        "open list:SIFIVE DRIVERS" <linux-riscv@...ts.infradead.org>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] Raise the minimum GCC version to 5.2

On Mon, May 3, 2021 at 3:17 PM Christophe Leroy
<christophe.leroy@...roup.eu> wrote:
>
>
>
> Le 01/05/2021 à 17:15, Masahiro Yamada a écrit :
> > The current minimum GCC version is 4.9 except ARCH=arm64 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 during 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, which is 5.5 at the time
> begin, just like the user would have selected 4.9.4 when 4.9 was the minimum GCC version.
>
> Christophe



One line below in Documentation/process/changes.rst,
I see

     Clang/LLVM (optional)  10.0.1           clang --version



Clang 10.0.1 is a bug fix release of Clang 10


I do not think GCC 5.2 is strange when we
want to exclude the initial release of GCC 5.





-- 
Best Regards
Masahiro Yamada