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

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Message-ID: <20210503122736.GG7604@twin.jikos.cz>
Date:   Mon, 3 May 2021 14:27:36 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kbuild@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will@...nel.org>, Miguel Ojeda <ojeda@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Jonathan Corbet <corbet@....net>,
        Michael Ellerman <mpe@...erman.id.au>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] Raise the minimum GCC version to 5.2

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]'
...