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Date:   Sun, 2 May 2021 15:32:53 -0500
From:   Segher Boessenkool <segher@kernel.crashing.org>
To:     Joe Perches <joe@perches.com>
Cc:     Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
        Masahiro Yamada <masahiroy@kernel.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 Doc Mailing List <linux-doc@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.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@lists.infradead.org, linuxppc-dev@lists.ozlabs.org,
        Will Deacon <will@kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH] Raise the minimum GCC version to 5.2
Message-ID: <20210502203253.GH10366@gate.crashing.org>
References: <20210501151538.145449-1-masahiroy@kernel.org> <CANiq72k1hB3X6+Nc_iu=f=BoB-F9JW2j_B4ZMcv8_UpW5QQ2Og@mail.gmail.com> <3943bc020f6227c8801907317fc113aa13ad4bad.camel@perches.com> <20210502183030.GF10366@gate.crashing.org> <81a926a3bdb70debe3ae2b13655ea8d249fb9991.camel@perches.com>
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On Sun, May 02, 2021 at 01:00:28PM -0700, Joe Perches wrote:
> On Sun, 2021-05-02 at 13:30 -0500, Segher Boessenkool wrote:
> > On Sat, May 01, 2021 at 07:41:53PM -0700, Joe Perches wrote:
> > > Why not raise the minimum gcc compiler version even higher?
> 
> On Sun, 2021-05-02 at 13:37 -0500, Segher Boessenkool wrote:
> > Everyone should always use an as new release as practical
> 
> []
> 
> > The latest GCC 5 release is only three and a half years old.
> 
> You argue slightly against yourself here.

I don't?

> Yes, it's mostly a question of practicality vs latest.
> 
> clang requires a _very_ recent version.
> gcc _could_ require a later version.
> Perhaps 8 might be best as that has a __diag warning control mechanism.

I have no idea what you mean?

> gcc 8.1 is now 3 years old today.

And there will be a new GCC 8 release very soon now!

The point is, you inconvenience users if you require a compiler version
they do not already have.  Five years might be fine, but three years is
not.


Segher