From: David Sterba <dsterba@suse.cz>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kbuild@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Will Deacon <will@kernel.org>, Miguel Ojeda <ojeda@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Jonathan Corbet <corbet@lwn.net>,
Michael Ellerman <mpe@ellerman.id.au>,
Palmer Dabbelt <palmer@dabbelt.com>,
Paul Mackerras <paulus@samba.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
linux-riscv@lists.infradead.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] Raise the minimum GCC version to 5.2
Date: Mon, 3 May 2021 14:27:36 +0200 [thread overview]
Message-ID: <20210503122736.GG7604@twin.jikos.cz> (raw)
In-Reply-To: <20210501151538.145449-1-masahiroy@kernel.org>
On Sun, May 02, 2021 at 12:15:38AM +0900, Masahiro Yamada wrote:
> 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]
There are still a lot of comment references to old gcc releases with
workarounds or bugfixes, a quick serarch:
$ git grep -in 'gcc.*[234]\.x'
arch/alpha/include/asm/string.h:30:/* For gcc 3.x, we cannot have the inline function named "memset" because
arch/arc/include/asm/checksum.h:9: * -gcc 4.4.x broke networking. Alias analysis needed to be primed.
arch/arm/Makefile:127:# Need -Uarm for gcc < 3.x
arch/ia64/lib/memcpy_mck.S:535: * Due to lack of local tag support in gcc 2.x assembler, it is not clear which
arch/mips/include/asm/page.h:210: * also affect MIPS so we keep this one until GCC 3.x has been retired
arch/x86/include/asm/page.h:53: * remove this Voodoo magic stuff. (i.e. once gcc3.x is deprecated)
arch/x86/kvm/x86.c:5569: * This union makes it completely explicit to gcc-3.x
arch/x86/mm/pgtable.c:302: if (PREALLOCATED_PMDS == 0) /* Work around gcc-3.4.x bug */
drivers/net/ethernet/renesas/sh_eth.c:51: * that warning from W=1 builds. GCC has supported this option since 4.2.X, but
lib/xz/xz_dec_lzma2.c:494: * of the code generated by GCC 3.x decreases 10-15 %. (GCC 4.3 doesn't care,
lib/xz/xz_dec_lzma2.c:495: * and it generates 10-20 % faster code than GCC 3.x from this file anyway.)
net/core/skbuff.c:32: * The functions in this file will not compile correctly with gcc 2.4.x
This misses version-specific quirks, but the following returns 216
results and not all are problematic (eg. just referring to gcc for some
historical reason) so I'm not pasting it here.
$ git grep -in 'gcc.*[234]\.[0-9]'
...
next prev parent reply other threads:[~2021-05-03 12:30 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-01 15:15 [PATCH] Raise the minimum GCC version to 5.2 Masahiro Yamada
2021-05-01 15:52 ` Miguel Ojeda
2021-05-01 17:38 ` Christophe Leroy
2021-05-02 2:41 ` Joe Perches
2021-05-02 18:30 ` Segher Boessenkool
2021-05-02 20:00 ` Joe Perches
2021-05-02 20:32 ` Segher Boessenkool
2021-05-02 21:05 ` Ali Kaasinen
2021-05-02 21:08 ` Linus Torvalds
2021-05-02 22:30 ` Matthew Wilcox
2021-05-03 7:34 ` Alexander Dahl
2021-05-03 8:54 ` Joe Perches
2021-05-03 9:25 ` Arnd Bergmann
2021-05-03 12:20 ` David Laight
2021-05-03 13:10 ` Miguel Ojeda
2021-05-04 5:30 ` Alexander Dahl
2021-05-04 6:33 ` Christophe Leroy
2021-05-04 12:07 ` Arnd Bergmann
2021-05-04 13:25 ` Andy Shevchenko
2021-05-03 11:35 ` Arnd Bergmann
2021-05-03 9:49 ` Kirill A. Shutemov
2021-05-02 21:23 ` Joe Perches
2021-05-03 0:44 ` Segher Boessenkool
2021-05-03 9:57 ` Arnd Bergmann
2021-05-04 7:56 ` Ben Dooks
2021-05-04 8:38 ` Miguel Ojeda
2021-05-04 9:22 ` Michal Suchánek
2021-05-04 12:09 ` Miguel Ojeda
2021-05-04 12:17 ` Michal Suchánek
2021-05-04 12:26 ` Christophe Leroy
2021-05-02 18:37 ` Segher Boessenkool
2021-05-03 6:16 ` Christophe Leroy
2021-05-04 2:13 ` Masahiro Yamada
2021-05-04 13:18 ` Andy Shevchenko
2021-05-03 12:27 ` David Sterba [this message]
2021-05-15 7:14 ` Pavel Machek
2021-05-15 7:27 ` Joe Perches
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