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

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Message-ID: <8b5f1d57-1357-affd-565f-f4826f3ecbdf@csgroup.eu>
Date:   Mon, 3 May 2021 08:16:58 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Albert Ou <aou@...s.berkeley.edu>, Arnd Bergmann <arnd@...db.de>,
        linux-kbuild@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
        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>,
        linux-riscv@...ts.infradead.org, Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] Raise the minimum GCC version to 5.2



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